The Treatment of Cheese Whey Wastewater by Waste Activated Sludge and Optimization of Treatment Conditions with Response Surface Methodology

The Treatment of Cheese Whey Wastewater by Waste Activated Sludge and Optimization of Treatment Conditions with Response Surface Methodology

Gholam Khayati (Department of Chemical Engineering, University of Guilan, Rasht, Iran) and Morteza Barati (Department of Chemical Engineering, University of Guilan, Rasht, Iran)
DOI: 10.4018/ijcce.2015010102
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Abstract

The biological treatments are convenient and economical methods for improving the efficiency of industrial waste water treatment. Activated sludge is the most important biological wastewater treatment processes. Batch cultures for the treatment of whey with activated sludge were optimized through response surface methodology (RSM). A second-order central composite design was applied to evaluate the effects of three independent variables (aeration time, pH and percentage of sludge volume) on COD removal percent. Optimum conditions were estimated through RSM at 23.4 h aeration time, pH=6.8 and 5.6 (%v/v) sludge volume/ wastewater volume and to achieve 38.1% COD removal. 1 (g/L) addition of PAC reduction COD until 48.7%.
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Materia And Metods

Whey

Cheese whey was obtained from the dairy producing factories in Rasht. Some characteristics of the cheese whey used in this study are presented in Table 1.

Table 1.
Some characteristics of the raw cheese whey used in the study
CharacteristicsMeasured value
COD (g/1)58.6
BOD5 (g/1)37.7
Lactose (g/1)49

Experimental Conditions

All experiments were done in batch stirred reactor used with working volume of 2 L in different conditions (Table 2). The seed sludge for reactor was obtained from a wastewater treatment plant in Rasht, Iran.

Table 2.
Central composite experimental design and responses
RunIndependent Variables aResponse (Y) b
X1X2X3
1-1-1-135.61
21-1-137.36
3-11-137.11
411-137.74
5-1-1131.35
61-1136.97
7-11133.81
811137.22
9-1.680032.66
101.680038.07
110-1.68035.16
1201.68037.55
1300-1.6837.33
14001.6833.44
1500037.36
1600036.29
1700037.46
1800036.63
1900037.07
2000036.93

ax1: aeration time, x2: pH, x3: percentage of sludge volume

b COD removal percent

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