超声联合热碱技术促进剩余污泥破解的参数优化

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Abstract

Optimization of combined ultrasonic and thermo-chemical disintegration of waste activated sludge was carried out using response surface methodology (RSM) and Box-Behnken design of experiment. The combined effects of ultrasonic (4000, 8000, 12000kJ/kg TS), thermal (60, 70, 80℃) and alkaline (0.04, 0.07, 0.10g/g TS) pretreatments on the disintegration degree of soluble COD (DD) were tested. By applying regression analysis, DD was fitted based on the actual value to a second order polynomial equation:Y=-196.87+6.11X₁+487.53X₂+0.0039X₃-1.742X₁X₂-0.000024X₁X₃+ 0.0044X₂X₃-0.0398X₁²-2488.33X₂² -1.33×10^-7X₃², where X₁, X₂, and X₃ were temperature, alkaline dosage, and specific energy, respectively. The coefficient of determination (R²) was as high as 97.548% confirming that the model used in predicted DD had a good fitness with experimental variables. The optimum DD achieved was 60.411% at temperature of 73.06℃, alkaline dosage of 0.085g/g TS, and specific energy of 9551kJ/kg TS. Economic evaluation showed that combined pretreatment reduced operating costs by ￥20.42/t sludge comparing with conventional anaerobic digestion without pretreatments.

Key words： response surface methodology combined ultrasonic and thermo-chemical pretreatment waste activated sludge economic evaluation

Received: 07 March 2017

PACS:

X703

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	Articles by authors
	XU Hui-min
	QIN Wei-hua
	HE Guo-fu
	DAI Xiao-hu

Cite this article:

XU Hui-min,QIN Wei-hua,HE Guo-fu等. Optimization of combined ultrasonic and thermo-chemical pretreatment of waste activated sludge for enhanced disintegration[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(9): 3431-3436.

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2017/V37/I9/3431

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