Ye Fenxia, Chen Yingxu, Feng Xiaoshan
Department of Environmental Engineering, Zhejiang University, Hangzhou 310029, China.
Huan Jing Ke Xue. 2003 Nov;24(6):112-5.
To determine whether chemical additions can be used to reduce sludge production in biological wastewater treatment, 3,3',4',5-tetrachlorosalicylanilide (TCS), served as a metabolic uncoupler was added to activated sludge cultures. The batch tests have confirmed that TCS is an effective chemical uncoupler in reducing the sludge yield when its concentration is higher than 1.0 mg/L. It was showed that TCS was able to reduce sludge yield by approximately 50% when the TCS concentration was 6.0 mg/L. It was also revealed that substrate removal capability and effluent nitrogen concentration were not affected adversely by the presence of TCS when TCS was dosed every other day in a range of 2.0-3.6 mg/L during the 40 d operation of activated sludge batch cultures. Such a sludge growth reduction is associated with the enhancement of microbial activities in terms of the SOUR and dehydrogenase activity. Sludge settleability from the treated and control samplers was comparable and not significantly different. Meanwhile, there was a finding that the filamentous bacteria still grow in sludge floc in the control reactor after 40 d operation. These results suggested that it might be possible to apply TCS in activated sludge systems to reduce the excess sludge yield.
为了确定是否可以使用化学添加剂来减少生物废水处理中的污泥产量，将作为代谢解偶联剂的3,3',4',5-四氯水杨酰苯胺（TCS）添加到活性污泥培养物中。批次试验证实，当TCS浓度高于1.0 mg/L时，它是一种有效的化学解偶联剂，可降低污泥产量。结果表明，当TCS浓度为6.0 mg/L时，TCS能够使污泥产量降低约50%。研究还表明，在活性污泥批次培养40天的运行过程中，每隔一天投加2.0-3.6 mg/L的TCS时，TCS的存在不会对底物去除能力和出水氮浓度产生不利影响。这种污泥生长的减少与微生物活性在比耗氧速率和脱氢酶活性方面的增强有关。处理后的样品和对照样品的污泥沉降性能相当，没有显著差异。同时，有研究发现，在对照反应器运行40天后，丝状细菌仍在污泥絮体中生长。这些结果表明，在活性污泥系统中应用TCS来减少剩余污泥产量可能是可行的。
