Optimization of ZLD in Distillery Industry by Reverse Osmosis Process for Prediction of Multi Responses by Taguchi Orthogonal Array

ISSN (e): 2250 – 3005 || Volume, 07 || Issue, 01|| January – 2017 ||
International Journal of Computational Engineering Research (IJCER)
www.ijceronline.com Open Access Journal Page 55
Optimization of ZLD in Distillery Industry by Reverse Osmosis
Process for Prediction of Multi Responses by Taguchi
Orthogonal Array
P.A. Gadge Principal, Waghaye Polytechnic Lakhani, Bhandara
Dr. A.C. Waghmare Principal, Department of Mechanical Engineering, Umrer College of Engineering, Umrer,
RTMNU, Nagpur
Dr. R.D. Askhedkar Professor, Department of Mechanical Engineering, KDK College of Engineering, RTMNU,
Nagpur, Maharashtra
I. INTRODUCTION
One of the most important environmental problems faced by the world is the pollution that is mostly generated
by industries. India is the most sugar producing country in world in recent time and integrated with distilleries
and distillery waste have hazardous effects. Molasses based distilleries are classified as a „Red‟ category
Industry by the Central Pollution Control Board. With the amount of highly polluting, spent wash being
generated at 10 to 15 times the volume of spirit produced, it is an area of major environmental concern. A recent
report suggests that there are 325 molasses based distilleries in the country producing 3063 million litres/year
(M.Ltr/year) of alcohol and generating 45945 M.Ltr/year of spent wash as waste annually. A Spent wash goes
through different phases like pretreatment in digester then lagooning for settling of solids and then major
process of reverse osmosis separating clean water from effluent and make the spent wash concentrate for
agriculture Biocomposting and clean water again used in industry. In this paper the RO processes parameters
are complete study and how to improve the clean water call permeate with quality in that again used in industry
and study. The RO Parameters are pressure ph, ORP and anti scaling which more affect the process of RO by
Taguchi Array set of representation in done so that effective utilization in resources to get the maximum quality
output.
II. LITERATURE REVIEW
Lingyung Hung et.al [1] this paper states that objective of this study is to remove salt from high salinity
wastewater and recycle a purified stream using an RO process. It was found that high operating pressure and
temperature were beneficial for wastewater treatment using the RO process. R Gunther et al [2] states that the
paper some aspect of engineering plant designs and economics of high pressure reverse osmosis system will be
discussed. S. Velikova ET. Al. [3] The effects of operating pressure and feed concentration on the solute
transport parameter (D,,/KS) and mass transfer coefficient (k) with respect to aqueous sodium chloride solutions
for different cellulose acetate membranes have been studied. Payel Sarkar ET. Al. [4] Small scale brackish water
desalination units are used in remote areas and their sustenance depend on the twin factors of consistency of
product water quality and availability of raw water resources. Jongs up Hong eP. Al. [5] Pressurized oxy-fuel
combustion power cycles have been investigated as alternatives. In this paper, as the extended work of our
ABSTRACT
In this study, the effects of Operating Pressure, Potential Hydrogen, Oxidation Reduction Potential
and Anti Scaling Agent on multi responses like Permeate, COD, Total Solids, Conductivity and
Hardness in the Reverse Osmosis Process were experimentally investigated on RO 8100 ST8 PT44
400Wl machine. The settings of RO parameters were determined by using Taguchi’s experimental
design method. Orthogonal arrays of Taguchi, the signal-to-noise (S/N) ratio, the analysis of
variance (ANOVA) are employed to find the optimal levels and to analyze the effect of the RO
parameters. Results show that potential of hydrogen, operating pressure, oxidation reduction
potential and anti scaling agent are the four Parameters that influence the Permit more effectively
and COD, Total Solids, Conductivity and Hardness respectively. Finally, the ranges for best RO
conditions are proposed for ZLD process.
KEYWORDS: ANOVA, reverse osmosis parameters, design of experiment, multi response,
orthogonal array, Taguchi method.

Optimization of ZLD in Distillery Industry by Reverse Osmosis Process for Prediction of Multi ..
previous study, we perform a pressure sensitivity analysis to determine the optimal combustor operating
pressure for the pressurized oxy-fuel combustion powercycle. R.Rauntenbach ET. Al. [6] this Paper discussed a
simpler and more-energy efficient process the combination of RO, operating at 16, 120 and 200 bar, with nano
filtration ad crystallizer/filtration. Jolanta Bohdziewicz ET. Al. [7] this paper review an attempt at removal of
nitrate ions from tap water by means of the compound reverse osmosis process and nono filtration. In the first
stage water was filtered from Nano filtration membranes which resultant in the absence of bivalent ions in the
obtained permeates. Vidyadhar V. Gedam ET. Al. [8] this paper examines the influence of different operating
parameters such as pressure, temperature, pH on the performance of polyamide reverse osmosis membrane.
Thus, proper control of these factors is essential for successful operation and maintenance. B. A. WINFIELD et.
Al. [9] states that Investigations have been made into techniques of removing sewage fouling from cellulose
acetate membranes using a pilot scale reverse osmosis unit. It has been found that reductions in the pH of
solutions surrounding the membrane when not pressurized are effective in loosening the fouling: Hoang ET. Al.
[10] states that conversely, calcium rejection improves in the presence of even small quantities of alginate
foulant at all pH values. The concentration of foulant, the feed pH and the presence of calcium are all shown to
impact upon this performance.
Pham Thanh Hai et. Al.[11]This project aims to investigate the effect of pH in order to improve the efficiency of
the RO desalination process. Based on the primary knowledge, decreasing the pH of the solution to a certain
extent can create several improvements to both the plant and the product. Bogdan C. Donose et. Al.[12]In this
study, three types of commercially available RO membranes were statically exposed to hypochlorite solutions
and analyzed by Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM) and
Atomic Force Microscopy(AFM) in conjunction with performance tests.) Hiroaki Ozaki et. Al.[13] states that
the investigation was conducted for synthetic wastewater and wastewater from the heavy metal industry. L. Y.
Dudley ET. Al. [14] this paper highlights how the selection of appropriate proprietary chemicals and their use in
conjunction with good pre-treatment design can ensure cost-effective and efficient operation. Yuelian Peng ET.
Al. [15] In this work, effects of four anti-scaling and five cleaning agents on calcium sulfate scaling in direct
contact membrane.
C.Saleh Al-Zahrani et. Al.[16] states that the purpose of this paper is to review the results of using different
types of anti-sealant chemicals at the Al-Jubail Desalination Plant. This paper will compare the results
experienced using the above chemicals. This paper will also discuss the necessity of anti-sealant selection for
every operating mode in MSF evaporators. A Mubarak. ET. Al. [17] meanwhile, In this paper, a) the reaction
mechanism leading to CaCO 3 crystallization is presented, b) the rates of the individual steps at this operational
temperature are reported; and c) the inhibiting effects of antiscalants on all of the rates involved are quantified
and discussed. S.A. Al-Saleh ET. Al. [18] states that in the past three decades a great deal of research activity
has focus& on the development and testing of anti-scale agents. Three basic methods are commonly applied in
inhibition of scale formation. The first method involves the prevention of scale deposition through pH
adjustment by acid addition. The second method controls scale precipitation through the addition of special
chemicals either alone or coupled with sponge ball cleaning. The third method is a combination of additive and
acid addition. R.J. Xie et. Al.[19] states that changes in reduction and oxidation potential (ORP) were studied
with variations in chlorine doses (0–5 mg L–1 NaOCl) and salinities. As expected, the ORP values were greater
at higher than at lower chlorine doses for any given water.
III. TAGUCHI BASED DESIGN OF EXPERIMENTS
Among the available methods, Taguchi design is one of the most powerful DOE methods for analyzing of
experiments. It is widely recognized in many fields particularly in the development of new products and
processes in quality control. The salient features of the method are as follows: a. a simple, efficient and
systematic method to optimize product/process to improve the performance or reduce the cost. b. Help arrive at
the best parameters for the optimal conditions with the least number of analytical investigations. c. It is a
scientifically disciplined mechanism for evaluating and implementing improvements in products, processes,
materials, equipment‟s and facilities. d. Can include the noise factor and make the design robust. e. Therefore,
the Taguchi method has great potential in the area of low cost experimentation. Thus it becomes an attractive
and widely accepted tool to engineers and scientists. [20] Sharda R. Nayse ET. Al. The machining processes
generate a wide variety of surface textures. Surface texture consists of the repetitive and random deviations from
the ideal smooth surface. These deviations are Roughness: small, finely spaced surface irregularities (micro
irregularities) Waviness: surface irregularities of greater spacing (macro irregularities) lay: predominant
direction of surface texture [21] Ani Idris et. Al. states that cellulose acetate hollow fiber membranes for reverse
osmosis (RO) were spun using a forced convection technique. In this study, a systematic experimental design
based on Taguchi‟s method (which is a fractional factorial method) has been employed for discussing the
relationship between the rejection rate coefficient, permeation rate and the dry–wet spinning conditions for
making cellulose acetate hollow fibers for RO. The factors considered in the experimental design included the

polymer contents (PCs), the ratio of the solvent (acetone) to swelling agents (form amide) in the dope solution,
the dope extrusion rate (DER), the type of bore fluid (BF), the residence time (RT) and the nitrogen gas flushing
rate (GR). The results indicate that the BF and the DER are the two most important factors in determining the
performance of the RO membranes. [22] Soumaya Yacout ET. Al. Quality control, quality assurance and total
quality management are all concerned with managing and controlling variations. The less variation a system has
the better quality it provides. Using the Taylor Expansion Series, Dr. Taguchi (1986) developed a mathematical
model in which loss is a quadratic function of the deviation of the quality of interest from its target value.
Taguchi defines three quality characteristics in terms of signal to noise (S/N) ratio which can be formulated for
different categories which are as follows:
a. Larger is best characteristics
Data sequence for maximizing the permeate, which is higher-the-better performance characteristics, is
preprocessed as per equation 3. S/N = -10 log ((1/n) (Σ (1/y2))……..…3, Where, y is value of response
variables and n is the number of observations in the experiments.
b. Nominal and small are best characteristics
Data sequence for Chemical oxygen demand, Total Solids, Conductivity and hardness, which are lower-the-
better performance characteristics, are preprocessed as per equations. S/N = -10 log (ŷ/s2y)………………….1,
S/N = -10 log ((l/n) (Σy2))……….……2
2.1 Taguchi method- based design of experiments involved following steps,
a. Definition of the problem
b. Identification of noise factors
c. Selection of response variables
d. Selection of control parameters and their levels
e. Identification of control factor interactions
f. Selection of the orthogonal array
g. Conducting the matrix experiments (experimental procedure and set-ups)
h. Analysis of the data and prediction of optimum level
a. Definition of the problem
A brief statement of the problem under investigation is “To optimize the Reverse Osmosis Process parameters to
minimize COD, Total solids, Conductivity and hardness and maximize the Recovery.”
b. Identification of noise factors
The environment in which experiments are performed is the main external source of temperature of performance
of Reverse Osmosis process. Some examples of the environmental noise factors are temperature, Feed Salinity,
Cleaning Procedure and human error in operating the process.
c. Selection of response variables
In any process, the response variables need to be chosen so that they provide useful information about the
performance of the process under study. Various parameters used while designing the experiments. By
considering all parameters given below and by taking literature review as technical base Permeate, COD, TS,
COND and Hardness are chosen as response variables.
D. Selection of control parameters and their levels:
The process parameters affecting the functioning of Machine Related Parameters: Operating Pressure and
Process Related parameters are - Potential of Hydrogen by HCL adding, ORP by SMBS adding and Anti scaling
agent by ROHIB adding.
Figure 2.1 Fishbone diagram of cause of effect

1.1. Selection of Operating Pressure (OP)
It is known from the fundamental of R.O process on operations pressure plays a vital role for maximizing the
permeate and quality of the permeate in literature[1-10] of R.O Process note that by increasing OP the quantity
of output increases with quality. Further by more increase in pressure lead to damaging the system and quality
of output. Which then lead to deterioration the membrane such as quality and integrity of the system. So with
destiny specification from manufacturer the range of OP is determined the effect is analyzed on output.
1.2. Selection of Potential of Hydrogen (PH)
Available literature [11-12-13] on RO process include that the influence of PH on output of RO on membrane
efficiency. Then proper control of ph is essential for successful operation and maintenance. The changing
physicochemical property of effluent produce an explanation of the modes, action of the PH effect feed PH
presence of calcium impact upon the performance of RO Process. Performance test shown a reduction of de-
ionized water and blackish water permeability
1.3. Selection of Oxidation Reduction Potential (ORP)
It is known that ORP of the feed greatly affect permeate as move the negative the ORP the better the result we
get in permeate. Some quality parameter gets affected by the ORP changing. The surface of membrane get less
gel formation (Concentration Polarization) paper suggests that. ORP plays a vital role in it came to smooth
operation and efficiency of RO process.
1.4. Selection of Quantity of Anti Scaling Agent (ASA)
It is found that scaling and fouling is a major loss to the RO process by which the permeate is affected and is the
qualities of permeate also. On view of Literature [14-18] facedown of anti-scalant is given according with the
feed and avoids the machine failure. Consulting the literature review and available anti scalant is to be managed.
Considering the literature review and the available machine settings following process parameters were selected
for the present work:
a) Operating Pressure (OP), b)Potential OF Hydrogen (PH), c)Oxidation Reduction Potential (ORP) ,d)Anti
Scaling agent (ASA)
d. Selection of orthogonal array-
Selection of particular orthogonal array from the standard O.A depends on the number of factors, levels of each
factor and the total degrees of freedom.
 Number of control factors = 4
 Number of levels for control factors = 3
 Degree of freedom of each factor= number of level-1=3-1=2
 Degree of freedom of interaction of A*B= (2*2)=4
 Degree of freedom of interaction of A*C= (2*2)=4
 Degree of freedom of interaction A*D= (2*2)=4
 Total Degree of freedom of control factors = 4*2=8
 Total Degree of freedom of interaction = 4+4+4=12
 Total degree of freedom-8+12=20
 Minimum number of experiments to be conducted =20+1=21
Based on these values and the required minimum number of experiments to be conducted is 21, the nearest O.A.
fulfilling this condition is L27.Therefore, Number of trials =27. The Experimental design has been shown with
coded and actual values of input parameters are shown in Table 1

Table1. Methodology Used For Termination of Reverse Osmosis Process
Table 2: Design of Experiments - Taguchi Array (L27)
RUN OP PH ORP ASA
1 35 5.9 -30 0.5
2 35 5.9 -180 1
3 35 5.9 -330 1.5
4 35 6.4 -30 1
5 35 6.4 -180 1.5
6 35 6.4 -330 0.5
7 35 6.9 -30 1.5
8 35 6.9 -180 0.5
9 35 6.9 -330 1
10 40 5.9 -30 0.5
11 40 5.9 -180 1
12 40 5.9 -330 1.5
13 40 6.4 -30 1
14 40 6.4 -180 1.5
15 40 6.4 -330 0.5
16 40 6.9 -30 1.5
17 40 6.9 -180 0.5
18 40 6.9 -330 1
19 45 5.9 -30 0.5
20 45 5.9 -180 1
21 45 5.9 -330 1.5
22 45 6.4 -30 1
23 45 6.4 -180 1.5
24 45 6.4 -330 0.5
25 45 6.9 -30 1.5
26 45 6.9 -180 0.5
27 45 6.9 -330 1

III. SELECTION OF WORK AND TOOL MATERIAL
I. St Tube Module (ST 161 -162)
i. Specification of STModule:
ii. Description:
Spacer Tube Module
The spacer tube module has been developed to gain hybrid advantages from an open channel and spiral module
design. The result is a membrane element with a channel design that is narrow and open.
IV. CONSTRUCTION DETAILS OF PT MODULE
The Plastic Flow Schematic of PT Module is shown in the diagram. This diagram gives the important
components of the PT Module a fully modular design comprising the following components:
Membrane Cushion Plastic Carrier Discs with internal „O‟ RingGasket
Fig 4.1 Cushion Plastic Carrier Discs Fig 4.2 Internal „O‟Gasket
Table3. Chemical composition of Spent washes
a. Test specimen
The work material used for the present study of SSK industry spent wash of characteristics of table no 3.
b. Cutting Tool
The recently developed tool materials like ST Module and PT Module With Perfect Combination have improved
the productivity with good output machine material. Table 3 and 4 gives the specification of different membrane
type.
V. EXPERIMENTATION
The experiment was performed on RO 8100 ST8 PT44400W machine. The experimental set figure 6.2 consist
of list of attachment and steps of different quality sensors, sense the parameter like temperature, ph, ORP,
Conductivity of the feed. Some of them can be control through the different attachment given to the system such
as HCL feed pump with HCL tank provide the level of ph control. Sodium Meta Bisulfate (SMBS) tank with
pump that it can control ORP level of the feed antiscalant tank and pump control the scaling and fouling as per
SR.N
O
DESCRIPTION UNIT VALUE
1. Part No: RO Pressure Vessel - 100601310115
2. Length of PressureVessel MM 1105
3. No. ofElement Nos. 04 (Stage – I) 04 (Stage –2)
Parameters TSS COND TDS TH
CACO3
CH CACO3 MH CACO3 M-alkalinity
as caco3
Values 3000max 33600max 24000max 800max 450-500max 300max 2000max
Parameters P-
alkalinity
as caco3
Chlorides as
Cl
Sulphates as
SO4
Iron as
Fe
Oil &Grease Free chlorine Phosphates
Values Nil 3000-5000max 1000 – 1500max 0.5max Nil Nil 600 - 700max
Parameters Sodium as
Na
Potassium as
K
Nitrogen Fluoride Total Silica
as SiO2*
COD BOD
Values 4000max 8000 -
10000max
1000 – 1100max 0.5max 30max. 27000 -
29000max
4500 –
5500max

the need of the feed given. The temperature is noise factor can‟t be control its total depend on the environmental
factor but for experimentation a small lagoon is made so that the define degree can be achieved. The four
parameter and noise factor have different setting and adjustment such as Ph-HCL adding, ORP- SMBS adding,
Anti Scalant- ROHIB adding and Operating Pressure- By HP pump adjustment by control this four factor over
year and with whether support the experimentation are conducted. The sensors are well calibrated with six
month duration. After the different setting given by taguchi array experimentation are conducted and water
sample as permeate is taken to ORIPAL Lab pvt. Ltd. For COD, Conductivity, Total Solids and Hardness by a
procedure manual with calibrated equipment and the result are taken out. The results are feed to MINITAB
software to get the interaction and result.
Figure 5.1 RO Process Fig 5.2 Control Panel Figure5.3 Meter
VI. EXPERIMENTAL DATA ANALYSIS
Minitab 14 software was used as it provides an effortless method to create, edit and update graphs. Also it
provides a dynamic link between a graph and its worksheet that helps in updating the graph automatically
whenever the data is changed. Its appearance and easy to use enhancements further add to its advantages. Data
analysis has been carried out by the procedural hierarchy as shown below.
1. Computation of (Signal-to-Noise Ratio) S/N ratio of experimental data. For calculating S/N ratio of Permeate,
Total Solids, Conductivity and hardness, formula of S/N ratio has been selected from equation 1,2 &3 according
to the objective of optimization.
2. ANOVA is carried out to find out the contribution of each parameter on the reverse osmosis process.
3. The predicted optimal setting has been evaluated from Mean Response.
4. Finally optimal setting has been verified by confirmatory test.
VII.TAGUCHI ANALYSIS (SIGNAL TO NOISE RATIO)
The Mean S/N Ratio is used to find out Optimal Level for Each Parameter and Rank of the parameter. The Rank
of the parameter shows that which parameter is most effective. The mean S/N ratio for each factor at levels 1, 2,
3and 4 can be calculated by averaging the S/N ratios for the experiments. Fig. 6.1, Fig. 6.3, fig. 6.5 shows the
S/N response graph for Permeate, COD, Total Solids, Conductivity and Hardness and respectively.
Table 7.1 Response Table for Signal to Noise Ratios (Permeate) Higher is better
Level OP PH ORP ASA
1 40.69 40.23 43.99 41.98
2 43.10 46.62 46.62 43.18
3 44.88 41.82 42.11 43.51
Delta 4.19 6.39 1.88 1.53
Rank 2 1 3 4

Table 7.2 Response Table for Signal to Noise Ratios (COD) Larger is better
Level OP PH ORP ASA
1 -40.24 -39.03 -36.86 -38.80
2 -38.80 -38.14 -38.57 -37.43
3 -36.37 -37.96 -39.71 -38.90
Delta 3.87 1.07 2.85 1.47
Rank 1 4 2 3
Table 7.3 Response Table for Signal to Noise Ratios (Total Solids) Smaller is better
Level OP PH ORP ASA
1 -55.03 -54.75 -54.68 -54.09
2 -54.25 -54.32 -54.36 -54.30
3 -53.51 -53.72 -53.74 -54.40
Delta 1.52 1.04 0.94 0.30
Rank 1 2 3 4
Table 7.4 Response Table for Signal to Noise Ratios (Conductivity) Smaller is better
Level OP PH ORP ASA
1 -56.02 -55.64 -55.06 -53.43
2 -54.19 -54.46 -53.97 -54.19
3 51.79 -51.90 -52.97 -54.38
Delta 4.23 3.74 2.08 0.95
Rank 1 2 3 4
Table 7.5 Response Table for Signal to Noise Ratios (Hardness) Smaller is better
Level OP PH ORP ASA
1 -26.27 -25.64 -25.08 -25.77
2 -25.57 -25.57 -25.50 -25.21
3 -24.84 -25.47 -39.71 -38.90
Delta 3.87 1.07 2.85 1.47
Rank 1 4 2 3
VIII. ANALYSIS OF VARIANCE (ANOVA)
The main aim of ANOVA is to investigate the design parameters and to indicate which parameters are
significantly affecting the output performance characteristics. In the analysis, the sum of squares and variance
are calculated. F-test value at 95 % confidence level is used to decide the significant factors affecting the
process and percentage contribution is calculated.
Table 8.1 Analysis Of Variance For (Permeate) Higher is better
Source DF SS Adj SS Adj MS F % contribution
OP 2 79.72387 79.7238743 39.861937 195.2102 24%
PH 2 199.4341 199.43419 99.717094 488.3305 62%
ORP 2 17.45676 17.4567687 8.7283843 42.74429 054%
ASA 2 11.81435 11.814356 5.9071779 28.92839 036%
OP+PH 4 9.386 9.386 2.3464 11.49 22%
OP+ORP 4 0.735 0.735 0.1837 0.90 25%
OP+ASA 4 0.627 0.627 0.1568 0.77 15%
Residual Error 6 1.225 1.225 0.2042
Total 26 319.68
Table 8.2 Analysis of Variance for COD
OP 2 67.6208 67.62083 33.81041 500.154 54%
PH 2 5.949807 5.949807 2.974903 44.00745 47%
ORP 2 36.97252 36.97252 18.48626 273.4654 096%
ASA 2 12.13072 12.13072 6.06536 89.72426 19%
OP+PH 4 0.244 0.244 0.0610 0.90 10 %
OP+ORP 4 1.267 1.267 0.3169 4.69 037%
OP+ASA 4 0.475 0.475 0.1187 1.76 062%
Residual Error 6 0.405 0.405 0.0676
Total 26 125.0654

Table 8.3 Analysis of Variance for Total Solids
Source DF SS Adj SS Adj MS F % Contribution
OP 2 10.38635 10.38635 5.1931797 337.6579 06%
PH 2 4.903225 4.903225 2.4516125 159.4026 24%
ORP 2 4.156560 4.156560 2.0782802 135.1287 20%
ASA 2 0.463101 0.463101 0.2315507 15.05531 02%
OP+PH 4 0.1639 0.1639 0.04096 2.66 008%
OP+ORP 4 0.0366 0.0366 0.00916 0.60 006%
OP+ASA 4 0.0466 0.0466 0.01166 0.77 003%
Residual Error 6 0.0923 0.0923 0.01538
Total 26 20.1274
Table 8.4 Analysis of Variance for Conductivity
OP 2 81.292206 81.292206 40.6461033 516.46891 46%
PH 2 66.255273 66.255273 33.1276369 420.93566 37%
ORP 2 19.860891 19.860891 9.93044568 126.18101 11%
ASA 2 4.9520830 4.9520830 2.47604154 31.461773 02%
OP+PH 4 2.746 2.746 0.6865 8.72 02%
OP+ORP 4 0.426 0.426 0.1064 1.35 01%
OP+ASA 4 0.277 0.277 0.0692 0.88 03%
Residual Error 6 0.472 0.472 0.0787
Total 26 175.2017
Table 8.5 Analysis of Variance for Hardness
Source DF SS Adj SS Adj MS F % Contribution
OP 2 9.094267 9.094267 4.547133 21.33302 52%
PH 2 0.141035 0.141035 0.070517 0.330834 081%
ORP 2 4.751426 4.751426 2.375713 11.14573 29%
ASA 2 1.705979 1.705979 0.85299 4.001828 098%
OP+PH 4 0.0378 0.0378 0.00945 0.04 021%
OP+ORP 4 0.1495 0.1495 0.03737 0.18 080 %
OP+ASA 4 0.2187 0.2187 0.05468 0.26 12%
Residual Error 6 1.2789 1.2789 0.21315
Total 26 17.37757
IX. RESULTS AND DISCUSSION
For Permeate the objective is to maximize it, therefore for calculating the S/N ratio larger the better S/N ratio is
used and S/N ratio is calculated for each experiment and mean of S/N ratio is also calculated for each parameter.
The mean of S/N ratio is calculated to find the rank of parameter and rank of parameter shows that which
parameter is most effective to the reverse osmosis process. From the mean S/N ratio at each level, maximum
S/N ratio is selected which indicates the optimal level for that parameter. For potential of hydrogen (PH) the
maximum S/N ratio is 62% at B2 .This indicates the optimal level for PH. Similarly for OP, ORP and anti agent
the minimum S/N ratio is at A3, C1, and D3. Therefore, optimal parameter for maximum permeate is at level
(A3B2C1D3) shown in fig. 7.1 i.e. Operating Pressure = 24%, potential of hydrogen = 62%, Oxidation
reduction potential; = 054%, Anti Agent = 036%.
For COD the objective is to minimize it, therefore for calculating the S/N ratio smaller the better S/N ratio is
used and S/N ratio is calculated for each experiment and mean of S/N ratio is also calculated for each parameter.
The mean of S/N ratio is calculated to find the rank of parameter and rank of parameter shows that which
parameter is most effective to the reverse osmosis process. From the mean S/N ratio at each level select the
maximum S/N ratio and this S/N ratio indicate the optimal level for the parameter. Therefore for OP the
maximum S/N ratio is 54% at A3 .This indicates the optimal level for OP. Similarly for ph, Oxidation reduction
potential (ORP) and anti agent the maximum S/N ratio is at B2, C1, and D3. Therefore, optimal parameter for
maximum COD is at level (A3 B2 C1 D3) shown in the fig. 7.3.i.e at Operating Pressure (OP) = 54%, potential
of Hydrogen (PH) =47%, Oxidation Reduction Potential (ORP) =0 96%, Anti Agent (ASA) = 19%.
For Total Solids the objective is to minimize it, smaller the better S/N ratio is used and S/N ratio is calculated
for each experiment and mean of S/N ratio is also calculated for each parameter. The mean of S/N ratio is
calculated to find the rank of parameter and rank of parameter shows that which parameter is most effective to
the reverse osmosis (RO) process. From the mean S/N ratio at each level, maximum S/N ratio is selected which
indicates the optimal level for that parameter. For PH the maximum S/N ratio is 24% at A3. This indicates the
optimal level for potential of Hydrogen. Similarly for Operating Pressure (OP), potential of Hydrogen (PH),
Oxidation Reduction Potential (ORP) and anti agent the maximum S/N ratio is at B3, C3, and D1. Therefore,

optimal parameter for minimum is at level (A3 B3 C3 D1) shown in the fig. 7.5.i.e at Operating Pressure = 06%,
Potential of Hydrogen (PH) = 24%, Oxidation Reduction Potential (ORP) = 20% and Anti Agent = 012%.
For Conductivity the objective is to minimize it, smaller the better S/N ratio is used and S/N ratio is calculated
for each experiment and mean of S/N ratio is also calculated for each parameter. The mean of S/N ratio is
indicates the optimal level for that parameter. For OP the maximum S/N ratio is 46% at A3. This indicates the
optimal level for Operating Pressure (OP). Similarly for Operating Pressure (OP), potential of Hydrogen (PH),
Potential of Hydrogen (PH) = 37%, Oxidation Reduction Potential (ORP) = 11% and Anti Agent = 02%.
For Hardness the objective is to minimize it, smaller the better S/N ratio is used and S/N ratio is calculated for
each experiment and mean of S/N ratio is also calculated for each parameter. The mean of S/N ratio is
indicates the optimal level for that parameter. For OP the maximum S/N ratio is 52% at A3. This indicates the
optimal level for Operating Pressure (OP). Similarly for Operating Pressure (OP), potential of Hydrogen (PH),
Potential of Hydrogen (PH) =081%, Oxidation Reduction Potential (ORP) = 29% and Anti Agent = 098%.
Figure 9.1Main effect plot for Permeate Figure 9.2 Interaction plot Permeate
MeanofSNratios
4 54 03 5
4 6
4 4
4 2
4 0
6 .96 .45 .9
-3 0-1 8 0-3 3 0
4 6
4 4
4 2
4 0
1 .51 .00 .5
O P P H
O R P A S A
M a in E f fe c ts P lo t ( d a ta m e a n s ) fo r S N r a tio s
S ig n a l- to - n o is e : La r g e r is b e tte r
O P
6.96.45.9 1.51.00.5
48
44
40
48
44
40
P H
O R P
48
44
40
454035
48
44
40
-30-180-330
AS A
O P
45
35
40
P H
6.9
5.9
6.4
O R P
- 30
- 330
- 180
A S A
1.5
0.5
1.0
In te r a c tio n P lo t ( d a ta m e a n s ) f o r S N r a tio s
S ig n a l-to -n o is e : La rg e r is b e tte r
Figure 9.3Main effect plot for COD Figure 9.4 Interaction plot for COD
MeanofSNratios
4 54 03 5
-3 6
-3 7
-3 8
-3 9
-4 0
6 .96 .45 .9
-3 0-1 8 0-3 3 0
-3 6
-3 7
-3 8
-3 9
-4 0
1 .51 .00 .5
O P P H
O R P A S A
M a in E f f e c ts P lo t ( d a ta m e a n s ) f o r S N r a tio s
S ig n a l- to - n o is e : S m a lle r is b e tte r
O P
6.96.45.9 1.51.00.5
-35.0
-37.5
-40.0
-35.0
-37.5
-40.0
P H
O R P
-35.0
-37.5
-40.0
454035
-35.0
-37.5
-40.0
-30-180-330
A S A
O P
45
35
40
P H
6.9
5.9
6.4
O R P
- 30
- 330
- 180
A S A
1.5
0.5
1.0
Figure 9.5Main effect plot for Total Solids Figure 9.6 Interaction plot Total Solids
MeanofSNratios
4 54 03 5
-5 3 .5
-5 4 .0
-5 4 .5
-5 5 .0
6 .96 .45 .9
-3 0-1 8 0-3 3 0
-5 3 .5
-5 4 .0
-5 4 .5
-5 5 .0
1 .51 .00 .5
O P P H
O R P A S A
O P
6.96.45.9 1.51.00.5
-53
-54
-55
-53
-54
-55
P H
O R P
-53
-54
-55
454035
-53
-54
-55
-30-180-330
A S A
O P
45
35
40
P H
6.9
5.9
6.4
O R P
- 30
- 330
- 180
A S A
1.5
0.5
1.0

Figure 9.7Main effect plot for Conductivity Figure 9.8 Interaction plot for Conductivity
MeanofSNratios
4 54 03 5
-5 2
-5 3
-5 4
-5 5
-5 6
6 .96 .45 .9
-3 0-1 8 0-3 3 0
-5 2
-5 3
-5 4
-5 5
-5 6
1 .51 .00 .5
O P P H
O R P A S A
M a in E f fe c ts P lo t ( d a ta m e a n s ) fo r S N r a tio s
S ig n a l-to -n o is e : S m a lle r is b e tte r
O P
6.96.45.9 1.51.00.5
-48
-52
-56
-48
-52
-56
P H
O R P
-48
-52
-56
454035
-48
-52
-56
-30-180-330
A S A
O P
45
35
40
P H
6.9
5.9
6.4
O R P
- 30
- 330
- 180
A S A
1.5
0.5
1.0
Figure 9.9Main effect plot for Hardness Figure 9.10 Interaction plot for Hardness
MeanofSNratios
4 54 03 5
-2 4 .8
-2 5 .2
-2 5 .6
-2 6 .0
-2 6 .4
6 .96 .45 .9
-3 0-1 8 0-3 3 0
-2 4 .8
-2 5 .2
-2 5 .6
-2 6 .0
-2 6 .4
1 .51 .00 .5
O P P H
O R P A S A
O P
6.96.45.9 1.51.00.5
-25
-26
-27
-25
-26
-27
P H
O R P
-25
-26
-27
454035
-25
-26
-27
-30-180-330
A S A
O P
45
35
40
P H
6.9
5.9
6.4
O R P
- 30
- 330
- 180
A S A
1.5
0.5
1.0
S ig n a l-to -n o is e : S m a lle r is b e tte r
X. CONCLUSION
The following are conclusions drawn based on the tests conducted on reverse osmosis process.
I] For Permeate:-
1) From the ANOVA, Table 7.4 and the P value, the nose radius is the most significant factor which contributes
to the permeate i.e. 52% contributed by the PH on Permeate
2) The second factor which contributes to permeate is the Operating pressure (OP) having 24%.
3) The third factor which contributes to Permeate is the ORP having 054%.
4) The Fourth factor which contributes to Permeate is the Anti Agent (ASA) having 036%.
II] For Chemical Oxygen Demand:-
to the COD i.e. 54% contributed by the OP on COD
2) The second factor which contributes to COD is the Potential of Hydrogen (PH) having 47%.
3) The third factor which contributes to COD is the ORP having 096%.
4) The Fourth factor which contributes to COD is the Anti Agent (ASA) having 019%.
II] For Total Solids:-
to the Total Solids (TS) i.e. 24% contributed by the potential of hydrogen on total solids (TS).
2) The second factor which contributes to total solids is the Operating pressure (OP) having 6%.
3) The third factor which contributes to total solids is the ORP having 20%.
4) The Fourth factor which contributes to total solids is the Anti Agent (ASA) having 012%.
II] For Conductivity:-
to the Conductivity i.e. 46% contributed by the Operating Pressure (OP) on conductivity.
2) The second factor which contributes to conductivity is the Potential of Hydrogen (PH) having 37%.
3) The third factor which contributes to conductivity is the ORP having 11%.
4) The Fourth factor which contributes to conductivity is the Anti Agent (ASA) having 02%.
II] For Hardness:-
1) From the ANOVA, Table 7.8 and the P value, the Operating Pressure (OP) is the most significant factor
which contributes to the hardness i.e. 52% contributed by the Operating Pressure (OP) on hardness.

2) The second factor which contributes to hardness is the Potential of Hydrogen (PH) having 081%.
3) The third factor which contributes to hardness is the ORP having 29%.
4) The Fourth factor which contributes to hardness is the Anti Agent (ASA) having 098%.
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