超声溶胞产生DOM去除污泥中Cd和As

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Abstract

The dissolved organic matter (DOM) released from ultrasonic lysis of sludge was used to remove the heavy metals in the waste activated sludge. The effects of DOM on the removal efficiency of cadmium (Cd) and arsenic (As) were investigated under different DOM concentrations, pH, shaking and washing time. The physicochemical properties of sludge before and after DOM leaching were also taken into comparisons. Moreover, changes of Cd and As speciation of sludge were analyzed by using continuous extraction of Tessier. Under optimal conditions:DOM concentration 1200mg/L, pH 6, leaching time 24h and the ratio of liquid to solid 40:1, the removal efficiencies of Cd and As were 36.12% and 23.75% (single washing) and improved to 62.35% and 39.45%(triple washing), respectively. The contents of organic matter and total nitrogen in the sludge increased, but the contents of total phosphorus, total potassium and pH decreased after triple leaching. The fractions of cadmium and arsenic distribution in sludge was changed before and after triple washing. Moreover, the available contents of Cd and As in sludge was significantly reduced.

Key words： DOM sludge washing cadmium arsenic ultrasonic lysis

Received: 27 April 2017

PACS:

X132

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	Articles by authors
	WANG Xiang
	LI Xiao-ming
	YANG Qi
	CHEN Can
	ZHONG Zhen-yu
	ZHONG Yu
	CHEN Xun-feng
	CHEN Fei
	ZHAO Qing-yuan

Cite this article:

WANG Xiang,LI Xiao-ming,YANG Qi等. Cadmium and arsenic removal from sludge by DOM produced from ultrasonic lysis of sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(11): 4179-4187.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I11/4179

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