Mechanism for sludge acidification in aerobic treatment of coking wastewater

活性污泥 废水 化学 污水处理 降级(电信) 环境化学 制浆造纸工业 环境工程 环境科学 计算机科学 电信 工程类
作者
Yu-Mei Y. Chao,I.-C. Tseng,Jo‐Shu Chang
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:137 (3): 1781-1787 被引量:21
标识
DOI:10.1016/j.jhazmat.2006.05.024
摘要

This work was undertaken to investigate the cause of sludge acidification that led to disruption of the activated sludge process treating coking wastewater from a steel-making plant in Taiwan. An activated sludge reactor (ASR) with a working volume of 80 L was used as a model system to simulate the behavior of the real wastewater treatment process. Parameters that may cause acidification or inactivation of the sludge (NH(3), SCN(-), S(2)O(3)(2-) and CN(-)) were studied individually to examine for their effects on the performance of the ASR. The results show that high loading of NH(3), SCN(-) and CN(-) did not lead to pH decrease, while the ASR attained 85% COD removal and nearly 100% SCN degradation. In contrast, when the wastewater was supplemented with ca. 1,000 mg/L of S(2)O(3)(2-), the pH dropped to nearly 4.0 in 2 days and the COD and SCN removal yields were significantly lower (at 50 and 0-20%, respectively). Thus, overloading of S(2)O(3)(2-) was apparently a key factor causing sludge acidification. The results suggest that to ensure a normal functioning of the activated sludge, the influent S(2)O(3)(2-) concentration should be closely monitored and that the pH control of the ASR is indispensable when the S(2)O(3)(2-) loading is in excess.
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