Cadmium and arsenic removal from sludge by DOM produced from ultrasonic lysis of sludge
WANG Xiang1,2, LI Xiao-ming1, YANG Qi1, CHEN Can2, ZHONG Zhen-yu2, ZHONG Yu2, CHEN Xun-feng1, CHEN Fei1, ZHAO Qing-yuan1
1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, China;
2. Huan Research Academy of Environment Science, Changsha 410004, China
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.
王祥, 李小明, 杨麒, 陈灿, 钟振宇, 钟宇, 陈寻峰, 陈飞, 赵庆圆. 超声溶胞产生DOM去除污泥中Cd和As[J]. 中国环境科学, 2017, 37(11): 4179-4187.
WANG Xiang, LI Xiao-ming, YANG Qi, CHEN Can, ZHONG Zhen-yu, ZHONG Yu, CHEN Xun-feng, CHEN Fei, ZHAO Qing-yuan. Cadmium and arsenic removal from sludge by DOM produced from ultrasonic lysis of sludge. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(11): 4179-4187.
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