Enhanced dewatering characteristics of waste activated sludge with Fenton pretreatment: effectiveness and statistical optimization

doi:10.1007/s11783-013-0530-3

Front Envir Sci Eng

2014, Vol. 8

Issue (2) : 267-276 https://doi.org/10.1007/s11783-013-0530-3

RESEARCH ARTICLE

Enhanced dewatering characteristics of waste activated sludge with Fenton pretreatment: effectiveness and statistical optimization

Guangyin ZHEN^1,3, Xueqin LU^2,3, Baoying WANG⁴, Youcai ZHAO¹(

), Xiaoli CHAI¹, Dongjie NIU¹, Tiantao ZHAO¹

1. The State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; 2. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China; 3. Graduate School of Environmental Studies, Tohoku University, Sendai, Miyagi 980-8579, Japan; 4. Shanghai Tongji Construction Co., Ltd, Shanghai 200092, China

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Abstract

In this work, the enhanced dewaterabing characteristics of waste activated sludge using Fenton pretreatment was investigated in terms of effectiveness and statistical optimization. Response surface method (RSM) and central composite design (CCD) were applied to evaluate and optimize the effectiveness of important operational parameters, i.e., H₂O₂ concentrations, Fe²⁺ concentrations and initial pH values. A significant quadratic polynomial model was obtained (R²= 0.9189) with capillary suction time (CST) reduction efficiency as the response. Numerical optimization based on desirability function was carried out. The optimum values for H₂O₂, Fe²⁺, and initial pH were found to be 178 mg·g^-1 VSS (volatile suspended solids), 211 mg·g^-1 VSS and 3.8, respectively, at which CST reduction efficiency of 98.25% could be achieved. This complied well with those predicted by the established polynomial model. The results indicate that Fenton pretreatment is an effective technique for advanced waste activated sludge dewatering. The enhancement of sludge dewaterability by Fenton’s reagent lies in the migration of sludge bound water due to the disintegration of sludge flocs and microbial cells lysis.

Keywords Fenton pretreatment response surface methodology (RSM) capillary suction time (CST) dewaterabilty molecular weight distribution

Corresponding Author(s): ZHAO Youcai,Email:zhaoyoucai@tongji.edu.cn

Issue Date: 01 April 2014

Cite this article:

Guangyin ZHEN,Xueqin LU,Baoying WANG, et al. Enhanced dewatering characteristics of waste activated sludge with Fenton pretreatment: effectiveness and statistical optimization[J]. Front Envir Sci Eng, 2014, 8(2): 267-276.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-013-0530-3
https://academic.hep.com.cn/fese/EN/Y2014/V8/I2/267

Tab.1 Characteristics of sewage sludge used in this study

Tab.2 Range and levels of natural and corresponding coded variables for RSM of sewage sludge dewaterability

Tab.3 Experimental and predicted response results of Fenton’s reagent to condition sewage sludge

Tab.4 ANOVA for the polynomial model for CST reduction efficiency (%)

Tab.5 Significance test of regression coefficients

Fig.1 Plots of standardized residuals vs. normal % of probability (a) and predicted vs. actual values (b) for CST reduction efficiency (%)

Fig.2 Response surface (a) and contour lines (b) for the interactive effects of HO and Fe concentrations on CST reduction efficiency (%)

Fig.3 Response surface (a) and contour lines (b) for the interactive effects of HO concentration and initial pH on CST reduction efficiency (%)

Fig.4 Response surface (a) and contour lines (b) for the interactive effects of Fe concentration and initial pH on CST reduction efficiency (%)

Fig.5 Molecular weight distribution of organic maters in sludge filtrates before and after Fenton conditioning (the mobile phase is Milli-Q water. Polyethylene glycol (MW at 1169, 771,128, 12, 4, 0.62 and 0.194 kDa) is used as molecular standard for the calculation)

Fig.6 Micrographs of the raw sludge (a) and sludge conditioned with Fenton’s reagent (b)

Fig.7 Schematic of sludge dewatering process with Fenton’s reagent

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