Multivariate analysis of sludge disintegration by microwave-hydrogen peroxide pretreatment process

被引:25
作者
Wang, Ya-wei [1 ]
Gui, Cheng-min [1 ]
Ni, Xiao-tang [1 ]
Chen, Mei-xue [1 ]
Wei, Yuan-song [1 ]
机构
[1] Chinese Acad Sci, Ecoenvironm Sci Res Ctr, Beijing 100085, Peoples R China
基金
中国国家自然科学基金;
关键词
Hydrogen peroxide; Microwave; Response surface methodology (RSM); Sludge disintegration; ADVANCED OXIDATION PROCESS; HIGH-TEMPERATURE MICROWAVE; WASTE-ACTIVATED-SLUDGE; SEWAGE-SLUDGE; ANAEROBIC-DIGESTION; NUTRIENT SOLUBILIZATION; ALKALINE SOLUBILIZATION; HYDROTHERMAL TREATMENT; IRRADIATION; MINIMIZATION;
D O I
10.1016/j.jhazmat.2014.10.022
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Microwave irradiation (with H2O2) has been shown to offer considerable advantages owing to its flexible control, low overall cost, and resulting higher soluble chemical oxygen demand (SCOD); accordingly, the method has been proposed recently as a means of improving sludge disintegration. However, the key factor controlling this sludge pretreatment process, pH, has received insufficient attention to date. To address this, the response surface approach (central composite design) was applied to evaluate the effects of total suspended solids (TSS, 2-20 g/L), pH (4-10), and H2O2 dosage (0-2 w/w) and their interactions on 16 response variables (e.g., SCODreleased, pH, H2O2remaining). The results demonstrated that all three factors affect sludge disintegration significantly, and no pronounced interactions between response variables were observed during disintegration, except for three variables (TCOD, TSSremaining, and H2O2remaining). Quadratic predictive models were constructed for all 16 response variables (R-2: 0.871-0.991). Taking soluble chemical oxygen demand (SCOD) as an example, the model and coefficients derived above were able to predict the performance of microwave pretreatment (enhanced by H2O2 and pH adjustment) from previously published studies. The predictive models developed were able to optimize the treatment process for multiple disintegration objectives. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:856 / 864
页数:9
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