Phyto-remediation NIB

7938
ISSN 2286-4822
www.euacademic.org
EUROPEAN ACADEMIC RESEARCH
Vol. II, Issue 6/ September 2014
Impact Factor: 3.1 (UIF)
DRJI Value: 5.9 (B+)
Phytoremedial Potential of Aquatic Plants for
Heavy Metals Contaminated Industrial Effluent
UZMA MAJEED1
Department of Plant and Environmental Protection
Pakistan
IFTIKHAR AHMAD
MAHMOODUL HASSAN
ASHIQ MOHAMMAD
Pakistan Agricultural Research Council (PARC)
Pakistan
Abstract:
Research was conducted to assess the potential of 3 native
aquatic macrophytes/plant species Water Hyacinth
(Eichhorniacrassipes), Water Lettuce (Pistiastratiotes) and Coontail
(Ceratophyllumdemersum) by growing on heavy metal contaminated
industrial effluent collected from the Fuse shop of Pakistan Ordinance
Factory, WahCantt, Rawalpindi. After initiation of the experiment, the
plant shoots and associated wastewater samples were collected
periodically, after every 6 days interval the experiment was terminated
on 24th day. The collected shoots and effluent samples were analyzed
for total copper (Cu), chromium (Cr), cadmium (Cd), zinc (Zn), nickel
(Ni) and lead (Pb) concentrations. Metal concentration of the effluent
was found to be 3.35, 3.81, 3.42 mg, 3.73, 2.66 and 3.33 mg L-1 for Cu,
Ni, Pb, Cr, Zn and Cd respectively. The concentration of Cu, Ni, Pb,
Cr, Zn and Cd observed in Water Hyacinth treated wastewater was
reduced to 0.00, 0.20, 0.002, 0.2, 0.02 and 0.01 mg L-1 respectively.
Water Lettuce reduced the concentration of Cu, Ni, Pb, Cr, Zn and Cd
in the wastewater as 0.03, 0.00, 0.002, 0.1, 0.02 and 0.001 mg L-1
respectively. Coontail reduced the heavy metal concentration of effluent
to 0.05, 0.00, 0.00, 0.13, 0.1, 0.00 mg L-1 for Cu, Ni, Pb, Cr, Zn and Cd
1 Corresponding Author: uzmalone@gmail.com

Uzma Majeed, Iftikhar Ahmad, Mahmoodul Hassan, Ashiq Mohammad-
Phytoremedial Potential of Aquatic Plants for Heavy Metals Contaminated
Industrial Effluent
EUROPEAN ACADEMIC RESEARCH - Vol. II, Issue 6 / September 2014
7939
respectively. The total metal concentration observed in the
phytoremediation plants was different for different metals. The
maximum metal concentration removed by Water Hyacinth was 68.4 g
-20L, 64.7 g -20L for Cr and Cu respectively. The total metal
concentration removal by Water Lettuce for Cu was relatively more
than Water Hyacinth i.e. 65.1 g -20L. Coontail efficiently removed
highest metal concentration of Cu, Ni, Cr and Cd than both the other
aquatic plants which was observed as 73.7 g -20L, 78.1 g -20L, 76.1 g -20L
and 70.5 g -20L respectively. Coontail was found efficient for the
removal of heavy metals from the wastewater as compared Water
Hyacinth and Water Lettuce.
Key words: wastewater, macrophytes, industrial effluent,
phytoremediation
Novelty Statement:
The study was conducted to analyze the potential of aquatic
macrophytes Water Hyacinth (Eichhorniacrassipes), Water
Lettuce (Pistiastratiotes) and Coontail
(Ceratophyllumdemersum) by growing on heavy metal
contaminated industrial effluent collected from the Fuse shop of
Pakistan Ordinance Factory, Wah Cantt, Rawalpindi. Results
showed that these plant species could be used for managing and
decontamination of wastewater with heavy metals.
I- Introduction
There is an increasing concern, for couple of decades, about the
rising environmental pollution and its irreparable drastic
effects on community health. The polluted water used for
growing crops pollutes arable land and also enters into the food
chain causing severe health hazards to humans (Aslam, 1998).
Effluents contain high amount of heavy metals such as Fe, Cu,
Zn, Pb, Cd, Cr and Ni. Industrial and municipal sewage water
is considered as a cheap source of irrigation water as it contains

Industrial Effluent
7940
some nutritional value and organic matter contents.
Continuous uses of such effluents result in heavy metals
accumulation in soil and food chain (Malla et al., 2007). Heavy
metal ions are either toxic to organisms themselves or induced
efficiency in others. Some metals such as Fe, Mg, Co, Cu and Ni
are essential nutrients in their low permissible limits. However,
if present above the permissible limit these are toxic to
biological system (Qadir et al., 1999). The most hazardous
metals in the contaminated waste water are Cd, Cr, Cu, Ni, As,
Pb and Zn, and are discharged from the chemical intensive
industries involved in metal processing. Living organisms
absorb heavy metals due to their high solubility in aquatic
environment. Toxic substances are released in the environment
and also add lethal effects on living organisms in food chain
(Dembitsky, 2003) and can cause severe health disorders (Babel
and Kurniawan, 2003).
Some heavy metals cause diseases like skin
manifestations, intuitive cancers and diseases related to vessels
and arteries. Cd can cause injury to kidney, renal disarray and
mutations in human cells. Similarly, Cr may cause pain,
sickness, diarrhea and queasiness; Cu damages liver causes
Wilson disease and insomnia. Further Ni causes dermatitis,
nausea, chronic asthma, cough and cancer. Zn leads to
depression, lethargy, neurological signs and increased thirst
and Pb is a cause of damaging fetal, brain, causes disease of
kidneys, circulatory and nervous system (Babel and
Kurniawan, 2003). On ranking, Pakistan stands as the 41st in
the world in industrial production (IMF WEOD, 2012). The
industries comprise of fertilizer, cement, cooking oil, sugar,
tobacco, steel, chemicals, machinery and foodstuff processing
are the chief cause of contaminating water bodies and urban
areas.
Pakistan Ordinance Factory (POF), a largest defense
industrial complex under the Ministry of Defense Production
located in Wah Cantt, is producing conventional arms and

Industrial Effluent
7941
ammunition to international standards and currently POF
comprises of fourteen ordinance factories and three commercial
subsidiaries. Pakistan Ordinance Factories manufacture
commercial explosive, ammunition, hunting and posses’ wide-
ranging facilities for the manufacturing of brass, aluminum,
copper, ingots, extrusion and sections for non-military
applications (POF, 2011).
A range of physical, chemical and biological techniques
are available to remediate the industrial effluent.
Sedimentation, screening, ventilation, filtration, flotation and
degasification techniques are the physical methods used to
remediate the industrial effluent (Peters et al., 1986). Chemical
methods are chlorination, ozonation, neutralization, adsorption
and ion exchange (Peters et al., 1986), and biological techniques
are activated sludge treatment, trickling filtration, oxidation
ponds, anaerobic digestion, septic tanks and lagoons (Foot et
al., 1993). Biological treatment techniques include
bioremediation, which uses the microbes or plants for the
degradation and transformation of pollutants to harmless state
within the maximum permissible limits (Muller et al., 1996).
Certain species of higher plants have the ability to amass
exceptionally high concentrations of metals in their tissues
without showing the toxic effect on the plant itself (Klassen et
al., 2000; Bennett et al., 2003).
Aquatic species that are explored and identified from the
polluted water and also tested for the phytoremediation of
heavy metals (Pb, Cu, Zn, Cr, Cd, Co, Fe, Hg, As etc) include,
Lemna minor (Duck Weed), Eichhornia crassipes (Water
Hyacinth) (Reddy and DeBusk, 1987; So et al., 2003), Pistia
stratiotes (Water Lettuce) (Sridhar, 2006), Ceratophyllum
demersum (Coontail) (Rai et al., 1995; Tripathi et al., 1995;
Devi and Prasad, 1998; Arvind and Prasad, 2005), Oenathe
javanica (Water Dropwort), Polygonum amphibian (Sharp
Dock), Lepironia articulate (Calamus) Hydrocotyle umbellate
(Pennywort) (Prasad and Freitas, 2003), Elodea canadensis

Industrial Effluent
7942
(American elodea, Canadian pond-weed) (Pamela et al., 1997),
Phragmites australis (Reed) (Aslam et al., 2007; Bragato et al.,
2006), Scirpus tabernaemontani (Zebra rush) (Skinner et al.,
2007) and Ipomoea aquatica (Water Spinach), Azolla
caroliniana (Water Ferns) (Rahman and Hasegawa, 2011).
The objectives of the present study were to quantify the metal
concentrations in the effluent of the Fuse Shop C-12, Pakistan
Ordinance Factory Wah Cantt and to explore the
phytoextraction potential of native aquatic plant species for the
remediation of effluent.
II- Materials and Methods
i) Industrial Effluent Phytoremediation
This study was conducted to quantify the metal contents in the
industrial effluent and to explore the phytoremedial potential of
aquatic plants. The experiment was conducted at
Bioremediation Site I, at National Institute of Bioremediation,
PARC Institute of Advanced Studies in Agriculture, National
Agricultural Research Centre (NARC), Islamabad. Industrial
effluent was collected from the Fuse Shop C-12, of the Pakistan
Ordinance factory (POF), Wah Cantt, Rawalpindi. In the Fuse
Shop different ammunition parts are processed for Anodizing
(growth of oxide film on certain metals) (Robert, 2002),
Passivation (preserving and strengthening the appearance of
metallic’s) (Brown et al., 2005) and electroplating (depositing a
layer of material to give a desired property e.g., corrosion,
lubricity etc) (Stelter and Bombach, 2004). The water used in
the processes of anodizing, passivation and electroplating of
different arms and ammunition was collected separately in
three cemented tanks constructed outside the Fuse Shop.
Two composite untreated mixed effluent samples, one
for initial characterization and the second sample for
phytoremediation experiments, were collected from the outlet of
Fuse Shop C-12 in two sequentially washed (tap water, acid

Industrial Effluent
7943
and deionized distilled water washing) polypropylene
containers. The effluent sample collected for initial
characterization was treated with distilled nitric acid to prevent
the microbial activities and stored at 40C. The effluent samples
were then transported to National Agricultural Research
Centre, Islamabad.
The collected effluent sample was filtered through 0.42
µm cellulose nitrate filter using vacuum filtration assembly and
analyzed for the pH, Hardness, Nitrates, Alkalinity, Electrical
Conductivity (EC) and Cations (Na, Ca, K & Mg) using
following standard methods. The pH of the effluent was
measured by using the pH Micrometer (Tandon, 2005). Total
alkalinity of the heavy metal contaminated industrial effluent
was measured using titration method using methyl orange
indicator as described by APHA (1981). Total Hardness of the
effluent was measured by buffer method (APHA, 1981). The
Electrical Conductivity of the effluent samples was measured
by the potable EC meter (cyber scan series 600) (Tandon, 2005).
The determination of Nitrate-Nitrogen of each sample was
measured using Hydrazine Reduction Method (Kamphake et
al., 1967). The effluent samples were filtered through 0.42 µm
pore size cellulose nitrate filter. The filtrate was then analyzed
for metals contents Cd, Cr, Pb, Cu, Ni and Zn using Flame
Atomic Absorption Spectrometer (PerkinElmer AAnalyst-800).
Three plant species, i.e. Water Hyacinth (Eichhornia
crassipes), Water Lettuce (Pistia stratiotes) and Coontail
(Ceratophyllum demersum), locally available, were collected
from the Bioremediation Plant Nursery of National Institute of
Bioremediation, National Agricultural Research Centre,
(NARC) Islamabad, Pakistan. The experiment was conducted in
the plastic tubs (top diameter was 35" inches and bottom
diameter was 25" inches). Twenty liters effluent from bulk was
poured into each of the acid washed plastic tubs and the aquatic
plants were transferred to the plastic tubs in six replicates,
grown for 24 days, and sampled after every 6 days for five

Industrial Effluent
7944
times. The samples were withdrawn in 100 mL double distilled
washed polyethylene bottles and labeled. Similarly, plant
samples were collected after every six days, for five times, and
thoroughly washed with running tap water followed by distilled
water to avoid any surface contamination. The plant material
was cleaned with blotting paper for removing surface moisture
and dried at 60 oC till constant weight. Three aquatic plant
species with six replicates were arranged in Randomized
Complete Block Design (RCBD). The data was statistically
analyzed using two factor (Plant species and time) factorial
experiments under RCBD. Analysis of Variance (ANOVA) of the
measured parameters was performed using Statistix 8.1 and
variable means were compared using Least Significant
Difference (LSD).
ii) Analytical Procedure
The collected effluent sample was filtered through 0.42 µm
cellulose nitrate filter using vacuum filtration assembly and
analyzed for the pH, Hardness, Nitrates, Alkalinity, Electrical
Conductivity (EC) and Cations (Na, Ca, K & Mg) using
following standard methods. The pH of the effluent was
measured by using the pH Micrometer (Tandon, 2005). Total
alkalinity of the heavy metal contaminated industrial effluent
was measured using titration method using methyl orange
indicator as described by APHA (1981). Total Hardness of the
effluent was measured by buffer method (APHA, 1981). The
Electrical Conductivity of the effluent samples was measured
by the potable EC meter (cyber scan series 600) (Tandon, 2005).
The determination of Nitrate-Nitrogen of each sample was
measured using Hydrazine Reduction Method (Kamphake et
al., 1967). The effluent samples were filtered through 0.42 µm
pore size cellulose nitrate filter. The filtrate was then analyzed
for metals contents Cd, Cr, Pb, Cu, Ni and Zn using Flame
Atomic Absorption Spectrometer (PerkinElmer AAnalyst-800).

Industrial Effluent
7945
III- Results
i) Heavy metal concentration of effluent after
phytoremediation
The Ordinance Factory Effluent was initially analyzed for
different physical and chemical parameters (Tables 1 & 2). The
effluent was alkaline in reaction having pH of 7.35 that lies in
safe limits of effluent disposal standards (pH 6-10). The
Electrical Conductivity was 0.53 dS m-1, Carbonates and
Bicarbonates were 0.28 and 1.13 mg L-1, respectively, Calcium +
Magnesium (Ca + Mg) was 1.68 mg L-1 whereas Sodium (Na)
and Potassium (K) were 3.45 and 0.78mg L-1, respectively
(Table 1). The effluent of the Fuse Shop C-12, Pakistan
Ordinance Factory was also initially analyzed for Zn, Cd, Cr,
Pb, Cu and Ni concentration (Table. 2). The Cu concentration of
the effluent was 3.35 mg L-1, Ni concentration was 3.81 mg L-1,
Pb concentration was 3.42 mg L-1, concentration of Cr was 3.73
mg L-1, concentration of Zn was 2.66 mg L-1 and that of Cd was
3.33 mg L-1. The observed concentrations of the metals were
found higher than their permissible limits for wastewater
disposal (Table 2).
An exponential reduction in effluent metals
concentrations were observed between six and twelve days after
initiation of experiment. Afterwards, the reduction in effluent
metal concentration was either very slow or not occurred (Figs.
1-6). The initial Cu concentration of the effluent was 3.35 mg L-
1 and was significantly (P <0.05) reduced to 0.05 mg L-1 on
twenty fourth day by Coontail and 0.00 mg L-1 by Water
Hyacinth and Water Lettuce, Ni concentration was 3.81 mg L-1
and reduced to 0.00 mg L-1 on twelfth day of the experiment by
Water Hyacinth, Water Lettuce and Coontail, Pb concentration
was 3.42 mg L-1 and reduced to 0.00 mg L-1 on eighteenth day
by Water Hyacinth and Coontail and 0.00 mg L-1 on twenty
fourth day by Water Lettuce, concentration of Cr was 3.73 mg
L-1 decreased to 0.00 mg L-1 on eighteenth day by Water

Industrial Effluent
7946
Hyacinth and Coontail and 0.00 mg L-1 on twenty fourth day by
Water Lettuce, concentration of Zn was 2.66 mg L-1which was
reduced to 0.00 mg L-1 by Coontail on sixth day and by Water
Hyacinth and Water Lettuce on eighteenth day, while the
concentration of Cd was 3.33 mg L-1 and efficiently reduced to
0.00 mg L-1 on eighteenth day by Water Lettuce and Coontail
and gradually by Water Hyacinth on twenty fourth day of the
experimental period.
A rapid reduction in Cu concentration was observed in
effluent samples collected after six days (Fig. 1). Relatively
more reduction in metal concentration was observed in effluent
treated with Coontail than that of other two aquatic plants and
was from 3.5 mg L-1 to 2.5 mg L-1 during first six days. It was
further reduced to 1.68 mg L-1 after 12 days, rapid removal of
Cu concentration in first six days and then gradual decrease
was observed until the concentration reduced to 0.05 mg L-1
that was within the safer limits (1.0 mg L-1) on twenty forth
day.
Similar metal removal trend was observed for Ni where
initially it was removed exponentially by low concentration in
effluent sample collected after six days. Relative large reduction
in metal concentration was observed in effluent treated with
Water Lettuce. While, Water Hyacinth and Coontail aquatic
plants decreased the Ni concentration from 3.7 mg L-1 to 2.4 mg
L-1 and 2.06 mgL-1 during first six days, respectively (Fig. 2)
that was in the safer limits of wastewater disposal (1.0 mg L-1)
and was significantly (P <0.05) further reduced to 0.01 mg L-1
when the sample was collected on twelfth day. It was observed
to be 0.00 mg L-1 on 24th day.
Linear reduction of Pb concentration in effluent was
observed over the experimental period (Fig. 3). Relative faster
removal was observed in the effluent treated with Coontail and
Water Lettuce than that of Water Hyacinth. After 12 day,
Water Lettuce and Coontail decreased the Pb concentration
from 3.31 to 1.5 mg L-1 and 0.85 mg L-1, respectively. The metal

Industrial Effluent
7947
was reduced to safer limits (0.5 mg L-1) of wastewater disposal
before the eighteenth day and was further reduced to below
detectable limits. Water Hyacinth and Coontail showed almost
similar metal removal trend over the experimental period.
However, Water Hyacinth metal removal rate was slower and
took 24 days to bring effluent Pb concentration below the
permissible limits (Fig. 3).
All the three aquatic plants tests showed different Cr
removal trend from Cu, Ni, and Pb. Initially, a rapid decrease
was observed in Cr concentration of effluent sample collected
after six and twelve days. Rather, more rapid reduction in Cr
concentration was observed in effluent where Coontail aquatic
plants were grown and the concentration was significantly (P
<0.05) reduced from 3.81 to 1.12 mg L-1 only after six days.
Almost all the Cr was removed from effluents by the aquatic
plants on eighteenth day of the experiment below detectable
limits. After 12 days, a gradual decrease in Cr concentration of
effluent was observed. Water Hyacinth and Water Lettuce
progressively reduced metal concentration from the effluent
from 3.8 mg L-1 and 3.7 mg L-1 to 2.02 mg L-1 and 2.16 mg L-1
after six days respectively and reduced the metal concentration
to standard level after six day to 0.21 mg L-1 and 0.13 mg L-1
respectively (Fig. 5).
Zinc extraction by Water Hyacinth was faster than
extraction by Water Lettuce and Coontail and the Zn
concentration was dropped to <0.03 mg L-1 after 6 days before
the permissible limits of the wastewater disposal (2.0 mg L-1)
(Fig. 6). Further, Zn removal by Water Lettuce dropped from
2.5 to <0.1 mg L-1 only after 6 days. After 12 days, a gradual
decrease in metal concentration was observed between 6 to 12
days. After 12 days no further reduction in Zn effluent
concentrations was observed in all treatments. Cadmium
removal behavior by Water Hyacinth, Water Lettuce and
Coontail was different than the rest of the metals. However,
there was a linear reduction in Cd concentration in the effluent

Industrial Effluent
7948
sample till 12 days in all treatments (Fig. 7). Maximum metal
reduction was observed in the effluent treated with Coontail
and concentration was reduced from 3.33 to 1.71 mg L-1 after 6
day. It was further reduced to 0.39 mg L-1 after 12 days.
Similarly, Water Hyacinth and Water Lettuce reduced metal
concentrations from 3.26 to 2.69 mg L-1 and from 3.27 to 2.76
mg L-1, respectively. The Cd concentration of effluent was
reduced to the safer limits (0.1 mg L-1) by Coontail after 12 days
and by Water Hyacinth and Water Lettuce after 18 days,
respectively.
ii) Heavy Metal Concentration in Phytoremedial
Plants
The metal concentration in Water Hyacinth, grown on the
metal contaminated industrial effluent increased exponentially
at earlier stages of the experiment. This was obvious from the
chemical analysis of Water Hyacinth shoot samples collected
after 6 and 12 days after initiation of experiment. Maximum Cu
concentration was observed in Water Hyacinth plant samples
collected on 24 day (8.44 mg kg-1), and on 6 day the Cu
concentration was 5.95 mg kg-1, on twelve day it was 4.12 mg
kg-1 and on eighteenth day it was 7.23 mg kg-1 (Fig. 8a).
Copper accumulation by Water Lettuce was very slow at
initial stages of experiment. The Cu concentration was
increased to 9.77 and to 23.97 mg kg-1 on 6 and 12 day of the
sample, but highest concentration was observed in Water
Lettuce samples collected on 24th day, i.e. 57.84 mg kg-1 (Fig.
8b). Coontail aquatic plants grown on contaminated effluent
showed incremental Cu accumulation till 18 day, i.e. 2239 mg
kg-1, 2626 mg kg-1, and 2785 mg kg-1 on 6, 12, and 18 days after
transplanting, respectively. However, slight reduction was
observed on 24th day (Fig. 8c).
Significantly higher amount of Ni was observed in Water
Hyacinth shoot samples collected on 6 day (32.34 mg kg-1) and
12 day (27.33 mg kg-1) of the experiment than that of rest of the

Industrial Effluent
7949
sampling (Fig. 9a). Afterwards, reduction in Ni concentration of
Water Hyacinth was observed, 13.31 mg kg-1 and 5.13 mg kg-1
after 18 and 24 days of transplanting, respectively.
The Ni concentration in Water Lettuce shoot samples
collected on 6th day was significantly higher than those of the
shoot samples collected on 12th, 18th and 24th days. Maximum
Ni concentration (81.52 mg kg-1) was observed in Water Lettuce
shoot samples collected after six day. Then reduction in Ni
concentration was observed in shoot samples collected on
twelfth (29.68 mg kg-1), eighteenth (4.43 mg kg-1) and twenty
forth day (29.63 mg kg-1) (Fig. 9b).
Initially an increase in Coontail Ni concentration was
observed as 304.63 mg kg-1 after 6 day and 523.92 mg kg-1.
While maximum concentration (523.92 mg kg-1) was observed
on 12th day sampling (Fig. 9c). However, significantly lower Ni
concentration was observed on 18 day (166.41 mg kg-1) and 24
day (115.66 mg kg-1) than the 6 day and 12 day. Similar trend
in the accumulation of Pb by both Water Hyacinth and Water
Lettuce was observed (Fig. 10a &10b). The concentration of Pb
was observed on the 6th day (37.03 mg kg-1) by the Water
Hyacinth plant was significantly higher than those plant
samples collected on 12th day (14.94 mg kg-1), 18th day (20.95 mg
kg-1) and 24th day (16.79 mg kg-1) (Fig. 10a).
Maximum amount of Pb accumulated (64.31 mg kg-1) by
Water Lettuce was observed on the sixth day. Then there was
significant reduction in Pb accumulation in following
samplings, i.e. 44.32, 22.34, 40.49 mg kg-1 on twelve, eighteen
and twenty fourth day, respectively (Fig. 10b). Significantly
(P<0.05) higher concentration of Pb was observed in Coontail
samples collected on sixth 399.18 (400 mg kg-1) and twelfth day
(400 mg kg-1) than those of collected on eighteenth day (222.24
mg kg-1) and twenty fourth day (174.89 mg kg-1) (Fig. 10c).
Significant (P<0.05) increase in the accumulation of Cr
was observed in Water Hyacinth shoot samples as compared to
other two aquatic plants used in this experiment. The

Industrial Effluent
7950
concentration of Cr observed in shoot samples collected after
sixth day was 12.68 mg kg-1 and on twenty fourth day was 17.89
mg kg-1. Water Hyacinth showed maximum Cr concentration on
twenty fourth day with comparison to other aquatic plants
during the experimental period (Fig. 11a). Similarly,
concentration of Cr in Water Lettuce observed after sixth day
was 39.33 mg kg-1, followed by 21.06, 39.01, and 82.11 mg kg-1
on twelve, eighteenth, and twenty fourth days, respectively
(Fig. 11b). However, highest Cr concentration was observed in
Coontail shoot samples collected after six days (586.37 mg kg-1)
and a significant increase was seen in the metal concentration
as the days passed. The highest concentration was observed on
the twenty fourth day i.e. 1931.65 mg kg-1 followed by 929.11
mg kg-1 and 1454.43 mg kg-1 on twelve and eighteenth day of
the experiment, respectively (Fig. 11c).
Similar Zn accumulation by Water Hyacinth was
observed after 6, 12, 18 and 24 days during the experiment.
Concentration of Zn was 34.2 mg kg-1 on twelfth day, 34.5 mg
kg-1 on eighteenth day and 33.4 mg kg-1 on twenty forth day
(Fig. 12a). Relative higher (but non -significantly (P<0.05)) Zn
concentration was observed on sixth day in plants samples
(40.3 mg kg-1).
Concentration of Zn observed in Water Lettuce on sixth,
twelfth and eighteenth day of the experiment was 60.54, 61.08
and 64.45 mg kg-1, respectively. Maximum concentration of the
metal was observed on twenty fourth day in the plants samples
(Fig. 12b). It was observed that Zn accumulation was
statistically similar in Coontail plant samples collected on 6th,
12th and 18th day. While statistically lower Zn accumulation
was observed in plant samples collected on 24th day than 6th
and 12th day. The Coontail shoot Zn concentration was 750.3 mg
kg-1 on six day and was 766.93 mg kg-1 on twelfth day. Slightly
less concentration, i.e. 641.87 mg kg-1 and 533.12 mg kg-1 was
observed on eighteenth and twenty fourth days, respectively
(Fig. 12c).

Industrial Effluent
7951
Variation was observed in the concentration of Cd in
Water Hyacinth after six days. Cd concentration was observed
as 46.74, 20.27, and 33.3 mg kg-1 on sixth, twelfth and twenty
forth day, respectively. Maximum concentration was observed
on eighteenth day (64.2 mg kg-1) as shown in Fig. 13a.
Significant (P<0.05) increase of Cd concentration was observed
in Water Lettuce i.e. 97.43, 191.55 and 292.36 mg kg-1 on six,
twelve and eighteenth day, respectively. Maximum Cd
concentration was observed on the twenty fourth day 768.01 mg
kg-1 (Fig. 13b).
Subsequent Cd metal concentration was observed in
Coontail after six days 4536.53 mg kg-1 and slowly the
accumulation decreased after eighteen days 4879.86 mg kg-1.
Maximum concentration of Cd was observed on twelfth day in
sampled plants i.e. 5701.46 mg kg-1. The least metal
concentration was observed on twenty fourth day 896.88 mg kg-
1 as shown in Fig. 13c.
The total metal removed by Water Hyacinth, Water
Lettuce and Coontail from the effluent of Fuse Shop C-12,
Pakistan Ordinance Factory, Wah Cantt illustrated in Fig. 16.
Coontail showed more removal of Ni (78.1 g-20L), Pb (67.1 g-20L),
Cr (76.1 g-20L), Zn (50.3 g-20L), Cd (70.5 g -20L) and Cu (73.7 g-20L)
than Water Hyacinth and Water Lettuce. Whereas, Water
Hyacinth removed higher Ni (64.5 g-20L), Pb (63.2 g-20L) and Cr
(68.4 g-20L) than Water Lettuce. While Water Lettuce removed
more Zn (39.8 g-20L) than Water Hyacinth.
IV- Discussion
An exponential reduction in the heavy metals concentration
was observed in effluent samples collected after six days from
the plastic tubs where all the aquatic plants were grown.
Relatively more reduction in Cu concentration (from 3.5 to 2.5
mg L-1) was observed in effluent where Coontail were grown
during first six days. Whereas Cu concentration effluent treated

Industrial Effluent
7952
with Coontail was remain fairly constant during the first twelve
days, while Coontail treated effluent showed maximum Cu
reduction during the first twelve days and effluent Cu
concentration was brought within the permissible limits (1.0
mg L-1). Nickel is an essential element for the ecosystems at low
concentrations while high concentration is considered as
harmful and toxic pollutant. The phytoremediation study
indicates that Coontail rapidly removed the Ni during first six
days. The reduction (from 3.7 to 2.06 mg L-1) of the Ni
concentration in the Coontail treated effluent was observed
during first six days. Results showed that Coontail lowered
utmost concentration of Ni from the polluted effluent which is
in line with the observation of Parneyan et al. (2011). Similar
results of Ni concentration reduction in industrial effluent
treated with Coontail have also been reported by Mjelde and
Faafeng (1997).
Similar to Cu and Ni reduction, decrease in Pb
concentration of effluent treated with Coontail was also more
than those treated with Water Hyacinth and Water Lettuce.
Maximum and rapid removal was observed in Coontail grown
effluent which decreased the Pb concentration from 3.31 to 2.14
mg L-1 and to 0.85 mg L-1 after six and twelve days,
respectively. Mishra et al. (2006) reported that when Coontail
plants exposed to Pb contaminated effluent for 1 to 7 days, most
of the metal was removed only after one day. The results
revealed that plants accumulated high amounts of metal.
Rapid decrease was observed in Cr concentration in effluent
sample collected after six day. The metal concentration was
decreased from 3.81 to 1.12 mg L-1 by Coontail and Cr
concentration increased considerably in Coontail plant. Garg
and Chandra (1990) showed a much higher concentration of Cr
in Coontail after 48 hours. They observed almost leaner Cr
concentration increase in Coontail when grown on effluent of
increased Cr concentration, i.e. at a 0.05 ppm effluent

Industrial Effluent
7953
concentration it was 117.7 ± 1.20 μg/g, at 0.1 ppm 160.87 ± 0.51
μg/g, and at 1.0 ppm 216.32 ± 0.91 μg/g.
Cadmium pollution of water bodies is alarming, because
it is a supplementary constituent and hinders plant
development upon accumulation. From the investigated results
it was found that rapid removal of Cd concentration from the
industrial effluent sample was observed after six days.
Relatively more reduction was observed in the effluent by
Coontail i.e. 3.33 to 1.71 mg L-1 followed by 0.39 mg L-1. The
observed results are similar to (Seema, 2008) study conducted
for the phyto-remediation of polluted effluent by growing
Coontail (C. demersum). It was observed that Cd removal was
dependent on the plant exposure to concentration. The highest
accumulation of Cd, 1293 µg g-1 dry weight, was found at 10
microM, after 7 days of time. Plants illustrated noteworthy
activities and act as an indicator for the environmental
contaminants, for hazardous heavy metals or phytotoxins.
Zinc was removed by Coontail at slower rate and
concentration was reduced from 2.52 to 0.45 mg L-1 after sixth
day. The slow removal of Zn from the effluent may be due to the
high concentration of Cd in the effluent that is confirmed by the
earlier results reported by Bunluesin et al. (2007). They
observed that high concentration of Cd in the effluent decreased
the Zn removal. Water Hyacinth was observed to be a relatively
better phyto-remedial aquatic plant for Cu, Cd, Zn and Pb
polluted industrial effluents. In the first twelve days the metal
removal was fairly low and it reduced the Cu (3.55 mg L-1), Cd
(3.26 mg L-1), Zn (2.66 mg L-1) and Pb (2.4 mg L-1) concentration
to 2.01 mg L-1, 2.15 mg L-1, 0.36 mg L-1 and 1.3 mg L-1,
respectively, on the twelfth day. Zhu et al. (1999) and Vesk et
al. (1999) showed similar results of removing metals from
industrial effluent treated with Water Hyacinth. However, in
present study for Ni and Cr showed that Water Hyacinth plant
removed substantial amount of Ni and Cr from the effluent and
reduced the concentration from 3.7 to 2.4 mg L-1 and 2.02 mg L-1

Industrial Effluent
7954
in first six days which was relatively at slower rate. Similar
results of metal concentration removal from the heavy metal
contaminated effluent treated with Water Hyacinth was also
reported by Stratford et al., 1984; Yahya, 1990; Abd- Elhamid,
1996.
Water Lettuce was found to have the great ability to
remove the Cr, Cu, Fe, Mn, Ni, Pb, and Zn (Lu et al. 2011) and
results were in line with the observations made during this
study. The reduction observed in Cu (3.55 mg L-1), Pb (3.42 mg
L-1), Cr (3.73 mg L-1 ) and Cd (3.27 mg L-1 ) concentration to 2.84
mg L-1, 1.91 mg L-1, 2.16 mg L-1 and 2.76 mg L-1 on twelfth day,
respectively. Similar results were reported by Mishra et al.
(2008) and Mokhtar et al. (2011) that Water Lettuce has the
ability to remove heavy metals (Fe, Zn, Cu, Cr and Cd) from the
effluent. The growth of Water Lettuce reduced the Ni and Zn
concentration from 3.7 and 2.31 to 1.8 mg L-1 and 0.10 mg L-1,
respectively, in first six days of the experiment. The removal of
Ni was very slow as compared to Zn and gradually reduced to
0.0 mg L-1 on the twelfth day of the experiment and was within
permissible limits (1.0 mg L-1). These results confirmed the
results reported by Ernst et al. (1992) that Water Lettuce when
exposed to high Ni concentrations removed large amount of Ni
from effluent.
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7955
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344.

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7959
Table 1. Chemical Parameters of Fuse Shop C-12, Pakistan Ordinance
Factory Effluent
Table 2. Initial Heavy Metal Concentrations of Fuse Shop C-12,
Pakistan Ordinance Factory Effluent
Heavy Metals
Observed Concentration *
Permissible Limits of
Effluent**
(mg L-1)
Copper 3.35 1.00
Nickel 3.81 1.00
Lead 3.42 0.50
Chromium 3.73 1.00
Zinc 2.66 2.00
Cadmium 3.33 0.10
 Average of 6 replicates, ** USEPA (1998)
Figure 1. Periodic Reduction in Cu Concentration of Treated
Industrial Effluent by Water Hyacinth, Water Lettuce and Coontail
Parameters Unit Value
pH -- 7.35
Electrical Conductivity dS m-1 0.53
CO3 mg L-1 0.28
HCO3 mg L-1 1.13
Ca + Mg mg L-1 1.68
Na mg L-1 3.45
K mg L-1 0.78

Industrial Effluent
7960
Figure 2. Periodic Reduction in Ni Concentration of Treated
Figure 3. Periodic Reduction in Pb Concentration of Treated
Figure 4. Periodic Reduction in Cr Concentration of Treated

Industrial Effluent
7961
Figure 5. Periodic Reduction in Zn Concentration of Treated
Figure 6. Periodic Reduction in Cd Concentration of Treated

Industrial Effluent
7962
Figure 8. Copper Concentration in Aquatic Plants Grown on Effluent
of Pakistan Ordinance Factory, Wah Cantt: (a) Water Hyacinth, (b)
Water Lettuce and (c) Coontail.

Industrial Effluent
7963
Figure 9. Nickel Concentration in Aquatic Plants Grown on Effluent
of Pakistan Ordinance Factory, Wah Cantt: (A) Water Hyacinth, (B)
Water Lettuce and (C) Coontail

Industrial Effluent
7964
Figure 10. Lead Concentration in Aquatic Plants Grown on Effluent
of Pakistan Ordinance Factory, Wah Cantt: (a) Water Hyacinth, (b)

Industrial Effluent
7965
Figure 11. Chromium Concentration in Aquatic Plants Grown on
Effluent of Pakistan Ordinance Factory, Wah Cantt: (a) Water
Hyacinth, (b) Water Lettuce and (c) Coontail.

Industrial Effluent
7966
Figure 12. Zinc Concentration in Aquatic Plants Grown on Effluent of
Pakistan Ordinance Factory, Wah Cantt: (a) Water Hyacinth, (b)

Industrial Effluent
7967
Figure 13. Cadmium Concentration in Aquatic Plants Grown on
Effluent of Pakistan Ordinance Factory, Wah Cantt: (a) Water
Hyacinth, (b) Water Lettuce and (c) Coontail

Industrial Effluent
7968
Figure 16. Total Metals Removed by Water Hyacinth, Water Lettuce
and Coontail from the Heavy Metal Contaminated Effluent of Fuse
Shop C-12, Pakistan Ordinance Factory, Wah Cantt

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