Coordination of electro-osmosis and ammonium persulfate on sewage sludge deep-dewatering

doi:10.16085/j.issn.1000-6613.2017.05.046

Abstract

Abstract: Dewatered sewage sludge from sewage treatment plant was studied by self-made experimental reactor dewatering based on electro-osmotic-ammonium persulfate oxidation process which is influenced by the voltage gradient,mechanical pressure,dewatered sewage sludge thickness and persulfate dosage. Furthermore,response surface methodology has been applied according to the Box-Benhnken center-united experimental design principle to optimize parameters of electro-osmotic dewatering as a response index to indicate the reduction ratio of sludge water content. Meanwhile,the effect of constituent and distribution of extracellular polymeric substance on electroosmotic dewatering behavior of sludge was investigated. The results showed that the dewaterability can be improved by the combined of electro-osmosis-ammonium persulfate oxidation process. The combined effects of the dewatered sewage sludge thickness & voltage gradient and the sludge thickness & persulfate dosage are significant. The water content can be reduced to below 40% with voltage gradient of 24.97 V/cm,mechanical pressure of 35.95 kPa,persulfate dosage of 39.81 mg/g DS,sludge thickness of 2.35 cm. The protein content in extracellular polymeric substance is significantly correlated with the final water content of sludge after electro-osmotic- ammonium persulfate oxidation dewatering process.

Key words: electro-osmosis, ammonium persulfate, oxidation, waste treatment, sewage sludge, dewatering

摘要： 利用电渗透和过硫酸铵氧化技术，采用自制实验装置对市政污水处理厂的脱水污泥进行了深度脱水研究，系统考察了电压梯度、机械压力、污泥厚度和过硫酸盐投加量对污泥脱水的影响。采用表面响应法以污泥含水率降低率为响应值，通过Box-Benhnken中心组合设计，对污泥脱水工艺参数进行了实验优化，并且研究了污泥胞外聚合物的组成及分布对污泥电渗透脱水行为的影响。结果表明，电渗透-过硫酸铵氧化协同技术可以改善污泥的脱水性能，污泥厚度与电压梯度、投药量的交互作用呈现出高度显著，在电压梯度为24.97V/cm、机械压力为35.95kPa、投药量为39.81mg/gDS、污泥厚度为2.35cm时，泥饼含水率可以降至40%以下，污泥胞外聚合物中蛋白质含量与电渗透脱水后污泥最终的含水率呈显著相关。

关键词: 电渗透, 过硫酸铵, 氧化, 废物处理, 污泥, 脱水

CLC Number:

X705

LI Yalin, LIU Lei, HOU Jinjin, LIU Xiaotong, HAN Ningning. Coordination of electro-osmosis and ammonium persulfate on sewage sludge deep-dewatering[J]. Chemical Industry and Engineering Progress, 2017, 36(05): 1919-1926.

李亚林, 刘蕾, 侯金金, 刘晓彤, 韩宁宁. 电渗透-过硫酸铵氧化协同强化污泥深度脱水[J]. 化工进展, 2017, 36(05): 1919-1926.

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