过硫酸盐对城市污泥脱水和重金属去除的影响

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Abstract The objectives of the study were to investigate the effects of the strong oxidizing agent-potassium persulfate on heavy metal removal, dewatering performance and characteristic of sludge. The results showed that sludge dewatering performance was improved, the moisture content of sludge cake was decreased from 82.6% to 74.8%, specific cake resistance was reduced from 6.70×10⁸S²/g to 5.43×10⁸S²/g under the condition (2for initial pH, 1h for reaction time, 25℃ for temperature, 1.34g/g SS for K₂S₂O₈ dosage). K₂S₂O₈ could effectively promote decomposition of the sludge floc. As a result, COD in the sludge supernatant was increased from 15.2mg/L to 187.0mg/L, TN in the sludge supernatant was increased from 6.03mg/L to 22.7mg/L, TP in the sludge supernatant was increased from 8.15mg/L to 12.7mg/L, and TSS in the sludge supernatant was decreased by 9.4%.The removal rates of tested heavy metals increased with increasing oxidant concentration, when the dosage of K₂S₂O₈ was 2.01g/g SS, the removal rates of Pb, Zn, Cu and Cd in sludge could reach 63.90%, 87.10%, 86.40% and 84.25%, respectively. The removal rates of heavy metals had been basically stable when the dosage was greater than 2.01g/g SS. However, the efficiency of removal could increase with decreasing pH within a certain range. The heavy metals in the sludge were transferred to the supernatant after K₂S₂O₈ oxidation. Then, calcium oxide of 0.075% concentrations was added to the supernatant, the pH value in the supernatant increased, as a result, the contents of heavy metals could be removed by 16.95% for Pb, 54.70% for Zn, 58.90% for Cu, and 21.95% for Cd in supernatant, respectively, the TN and TP in the liquid could be obviously improved.

Key words： potassium persulfate oxidation heavy metals municipal sludge dewatering performance

Received: 30 May 2017

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	Articles by authors
	ZHANG Wei-ning
	XIAO Zhi-hua
	Ma Bin
	ZENG Qing-ru

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ZHANG Wei-ning,XIAO Zhi-hua,Ma Bin等. Effects of persulfate oxidation on dewatering performance and removing heavy metals in municipal sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2017, 37(12): 4605-4613.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2017/V37/I12/4605

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