Is2616721675

P.A.Fasnabi, C.S.Remya, G.Madhu/ International Journal of Engineering Research and
Applications (IJERA) ISSN: 2248-9622 www.ijera.com
Vol. 2, Issue 6, November- December 2012, pp.1672-1675
Degradation of Acetamiprid in Wastewater by Ozonation
P.A.Fasnabi, C.S.Remya, G.Madhu
Department of Chemical Engineering, Govt Engineering College, Thrissur-9, India
Chemical Engineering Group, School of Engineering, Cochin University of Science and Technology, Kochi-22,
India

ABSTRACT
Pesticides belong to the class of persistent studied by Benitez et al. He could obtain similar
chemicals in the environment which cause serious degradation at pH 2 and 9 which indicates the
health hazards. Advanced Oxidation Processes negligible contribution of the reaction with hydroxyl
(AOPs) represent the fast developing area in radical generated by the ozone self-decomposition at
water and wastewater treatment by which non pH 9 [12]. K.lafi et al. could obtain 90% removal of
biodegradable and difficult to biodegradable the pesticide deltamethrin using ozonation in a
compounds can be removed. This paper discusses period of 210 min [1]. Amat et al. treated a pair of
the use of ozonation for the removal of insecticide commercial anionic surfactants with ozonation in an
acetamiprid from water. Response surface alkaline medium. After only 10 min of treatment,
Methodology was used for the optimisation of the surfactants were almost completely eliminated [14].
process parameters: ozone flow rate and pH. The present work focuses on the degradation of
acetamiprid by ozonation. The effect of parameters
Keywords - Acetamiprid, Advanced Oxidation like ozone flow rate and pH were also studied.
Process, Ozonation Response surface methodology was used for
optimisation of the process.
1. INTRODUCTION
Pesticides have become an unavoidable 2. EXPERIMENTAL
commodity in our modern life. The introduction of 2.1 PROCEDURES
pesticides in the environment cause serious issues of Acetamiprid (97%) was purchased from
which water pollution is of primary importance. Rallis India. The properties of acetamiprid is given
Removal of these compounds from water is a in Table 1. Sulphuric acid and sodium hydroxide
challenge to the environmental engineers because were used for adjusting the pH. The reagents were
most of them are nonbiodegradable [1]. Acetamiprid not subjected to further purification. Distilled water
belongs to a new class of insecticides, was used for making the solutions throughout.
neonicotinoids, The use of neonicotinoids is Ozone generator of capacity 2g/hr was used as the
increasing tremendously because of their ability to source of ozone.
replace most of the organophosphates. They are Table1. Properties of Acetamiprid
commonly applied to cotton, vegetables, flowers, Common Name Acetamiprid
fruits etc. Name (IUPAC): (E)-N-[(6-chloro-3-
Most of the chemical treatment methods pyridyl)methyl]-N-cyano-N-
utilized for pesticides degradation cause the methyl acetamidin
formation of secondary pollutants. Advanced
Molecular C10H11ClN4
oxidation processes employ different methods for
Formula
generation of the hydroxyl radicals. Hydroxyl
Molecular Weight 222.68
radicals are very reactive and not highly selective.
They can convert the pollutants to CO2 and water or Pesticide Type Insecticide
atleast to degradable compounds [2-5]. Ozonation is Chemical Family Neonicotinoid Insecticide
a widely used technique for the removal of Application Sites Control of Sucking-Type
pollutants from water and wastewater[6-8]. The Insects on Leafy Vegetables,
degradation of compounds occurs through the action Fruiting Vegetables, Cole
of ozone itself as well as through the radicals Crops, Citrus Fruits, Pome
generated in aqueous medium. The major reactions Fruits, Grapes, Cotton, and
taking place are [9-11]: Ornamental Plants and
O3 + OH-→ O3.-+ OH. (1) Flowers
O3.- → O2 + O.- (2) Carrier Water
O.- + H- → OH. (3) Physical State Solid, Powder
Ozonation was utilized by Esplugas et al. for the Color White powder
removal of phenol from wastewater [9]. 100% Odour Odorless
degradation was obtained at a pH of 9.4 in 80 Solubility in 4.25 x 10+3 mg/L at 25°C
minutes. Degradation of carbofuran by ozone was Water

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The stock solution of acetamiprid p, and the significant level (1-p) are also given in the
containing 0.5 mg /cm3 was prepared using distilled Tables 3-5. It can be observed from the tables 3 to 5
water. 500ml of the solution was taken and pH was that all the terms except the interaction term of pH
adjusted using H2SO4/ NaOH. The flow rate of and ozone flow rate are highly influential in the
ozone was adjusted to the desired level and it was model for the prediction of pesticide removal, COD
passed through diffusers in to the solution for and TOC from the waste water.
2hours. After the treatment the solution was
anlaysed for COD, TOC and concentration of the Table 3: Estimated Regression coefficients and
insecticide. TOC was measured using Shimadzu corresponding p values for COD removal (%)
TOC-L-CPH analyzer. Concentration of pesticide Factor Coefficient of p value Significance
was analysed by Hitachi Elite Lachrome High the model in Level (%)
Performance Liquid Chromatograph equipped with uncoded
UV detector. The mobile phase was a mixture of factors
water /acetonitrile (70-30). It was eluted at a rate of
1 ml/min. COD was measured by standard methods Constant -266.109 0.003 >47%
[12]. A 834.206 0.002 >99%
B 313.705 0.006 >98%
2.2 RESPONSE SURFACE METHODOLOGY
Response surface methodology (RSM) is Aa -2.577 0.000 >99%
essentially a particular set of mathematical and bb -156.538 0.002 >99%
statistical methods for designing experiments,
building models, evaluating the effect of variables, ab 6.268 0.194 >80%
and searching optimum conditions of variables to
predict target responses [15-17]. Its important Table 4: Estimated Regression coefficients and
applications are in the designs, development, corresponding p values for Pesticide removal (%)
formulation of new processes, and in the Factor Coefficient p value Significance
improvement of existing designs. Its purpose is to of the model Level (%)
determine the optimum operating conditions through in uncoded
experimental methods. In this work, central factors
composite design with two factors at five levels was
applied using Minitab 15 (Minitab Inc., State Constant -7.4615 0.533 >47%
College, PA,trial version). The parameters used are A 8.5787 0.000 >99%
ozone flow rate and pH which are denoted by A and
B respectively. The levels of independent variables B 44.5947 0.022 >98%
are given in Table 2. Aa -0.5431 0.000 >99%
bb -23.5968 0.007 >99%
Table 2: Independent variables and their levels for
the central composite design ab 1.0447 0.239 >80%

Variable Coded Levels Table 4: Estimated Regression coefficients and
-α -1 0 +1 +α corresponding p values for TOC removal (%)
pH 4.38 5.5 8.25 11 12.1
39 Factor Coefficient p value Significance
Ozone 0.702 0.814 1.086 1.357 1.46 of the Level (%)
Flow rate 9 model in
(g/hr) uncoded
factors
3. RESULTS AND DISCUSSION Constant -34.1129 0.001 >47%
3.1 RESPONSE SURFACE METHODOLOGY A 4.9307 0.000 >99%
A second-order polynomial model, as B 38.4338 0.004 >98%
given in Equation 4 was fitted to the experimental
data Aa -0.3349 0.000 >99%
Y= Constant + aA + bB + aaA2 + bbB2+ abAB bb -16.822 0.003 >99%
(4) 0.2980 0.555 >45%
ab
where Y is the response variable; a and b are the
regression coefficients for linear effects; aa, bb are Equation 5 can be represented in terms of uncoded
the quadratic coefficients and ab is the interaction variables as
coefficient. The significance of the regression Y1 = -266.109 + 34.20572A + 313.705B – 2.577A2
coefficients was analyzed using p test. The values of –156.538B2 + 6.268AB
(5)

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Y2 = -7.46154 + 8.57873A + 44.5947B – 0.5431A2
Contour Plot of %TOC removal vs Ozone flowrate(g/hour), pH
– 23.5968B2 + 1.0447AB
(6) 1.4 7.5

Y3 = -34.1129 + 4.9307A + 38.4338B – 0.3349A2 – 1.3
16.8222B2 + 0.2980AB

Ozone flowrate(g/hour)
1.2
(7)
Where Y1, Y2, Y3 correspond to response of COD, 1.1
pesticide and TOC removal percentages
1.0
respectively. 2.5
0.9

3.2 EFFECT OF VARIABLES 0.8
2.5 5.0 0.0

The results of the Experimental runs are given 5 6 7 8 9 10 11 12
pH
Figure 1-3. Contour plots shows that the maximum
exists in the domain selected for study.
Fig 3: Combined Effect of pH and Ozone flow rate
Contour Plot of %COD removal vs Ozone flowrate(g/hour), pH
on TOC Removal
40
1.4 The optimum conditions predicted for the
1.3
process were pH 8.2 and ozone flow rate of

1.18g/hr. The COD removal(%), pesticide removal
1.2
(%) and TOC removal at this conditions were 53.9,
1.1 56.9 and 8.7% respectively. TOC removal is low
1.0
since the degradation products of acetamiprid exist
in the medium and mineralization was not complete.
0.9
0 The optimum conditions were checked
0.8 experimentally and results obtained were close to
20
20 the predicted value.
5 6 7 8 9 10 11 12
pH
4. CONCLUSION
The ozonation process for the removal of
Fig 1: Combined Effect of pH and Ozone flow rate acetamiprid from aqueous solutions was
on COD removal investigated. As ozonation is normally used for
disinfection, the removal of pesticide is an added
Contour Plot of %Pesticide removal vs Ozone flowrate(g/hour), pH
advantage. Eventhough the degradation is not
complete, a removal efficiency of 57% was obtained
45 51
1.4 which shows that ozonation can be used as a first
1.3
step in the treatment process. The optimum pH

obtained was 8.1, which shows that the process is
1.2
more effective in alkaline medium. This can be
1.1 explained by the equations 1-3. Ozonation is a
1.0
viable process for acetamiprid removal and it does
51
not produce sludge as in Fenton process.
0.9
Combination of Ozone with other reagents like
0.8 54 H2O2 and UV can be tried for improving the
45 48
48 removal of pesticide.
5 6 7 8 9 10 11 12
pH
5. ACKNOWLEDGEMENT
The authors wish to thank centre for
Fig 2: Combined Effect of pH and Ozone flow rate Engineering Research and Development (CERD),
on Pesticide Removal Kerala for financial support

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