剩余污泥自絮凝特性及关键影响因素作用分析

发布时间：2018-01-07 03:00

本文关键词：剩余污泥自絮凝特性及关键影响因素作用分析　出处：《哈尔滨工业大学学报》2016年02期 　论文类型：期刊论文

【摘要】：为解决污泥减量化处理过程中药耗或能耗过高、污泥量增加等问题,提出利用污泥自身胞外聚合物(EPS)产生的自絮凝调理来促进其脱水性能,通过正交实验和单因素实验考察污泥质量浓度、搅拌强度和搅拌时间对污泥自絮凝特性的影响,分析污泥毛细吸水时间(tCST)、污泥容积指数(SVI)、污泥粒径和Zeta电位的变化规律.结果表明,自絮凝可增大污泥粒径,提高污泥疏水性,减少絮体表面Zeta电位的影响,从而改善污泥脱水性能和沉降性能.在最佳参数(污泥质量浓度18 g·L-1、搅拌强度200 r/min、搅拌时间3.5 min)条件下,自絮凝后污泥体积平均粒径增加11.4%,Zeta电位升高19.0%,tCST降低17.1%,SVI降低8.1%,效果显著.所考察的因素对自絮凝作用的影响程度依次为:污泥质量浓度搅拌时间搅拌强度.较高的污泥质量浓度、搅拌强度和搅拌时间均有利于提高自絮凝效果,而当污泥质量浓度、搅拌强度或搅拌时间大于最佳参数时,自絮凝效果则逐渐减弱.研究成果提供了利用污泥自身特性进行调理的新思路,可为优化污泥调理方式、降低调理药耗和减少污泥产量提供技术支持.
[Abstract]:In order to solve the sludge reduction process of Chinese consumption or consumption is too high, the problem of sludge increased, the sludge itself of extracellular polymeric substances (EPS) produced from flocculation to promote its dewatering performance through orthogonal experiment and single factor experiment to study the sludge concentration, stirring intensity and stirring time on the effect of sludge self flocculating characteristics the analysis of capillary suction time (tCST), sludge volume index (SVI), sludge particle size and Zeta potential variation. The results show that self flocculation can increase sludge particle size, improve sludge hydrophobicity, reduce the influence of floc surface Zeta potential, so as to improve the performance of sludge dewatering and settlement in the best performance. The parameters (sludge concentration of 18 g - L-1, the mixing intensity is 200 r/min, stirring time of 3.5 min) under the condition of self flocculating sludge volume average particle diameter increased 11.4%, Zeta potential increased 19%, tCST decreased 17.1%, SVI decreased by 8.1%, The effect is significant. The factors are the influence degree of the self flocculating effect: the sludge concentration and stirring time stirring strength. High sludge concentration, stirring intensity and mixing time were conducive to improving the self flocculating effect, and when the sludge concentration, stirring intensity or mixing time is greater than the optimum parameters, since the flocculation effect is gradually weakened. Research results provide a new method of conditioning using sludge characteristics, can be optimized for sludge conditioning, conditioning to reduce drug consumption and reduce sludge production to provide technical support.

【作者单位】：哈尔滨工业大学市政环境工程学院;城市水资源与水环境国家重点实验室(哈尔滨工业大学);
【基金】：国家自然科学基金(51278143) 国家重大科技专项(2014ZX07202-011)
【分类号】：X703
【正文快照】： 剩余污泥是活性污泥法处理污水的副产物,具有组分复杂、性质易变、处理处置困难等特点,极易造成二次污染[1-2].脱水减容是剩余污泥处理处置的关键步骤,然而剩余污泥受“粘胶相区”的影响,高效脱水困难[3].研究表明,对剩余污泥调理后再进行脱水能够提高脱水效率[4-5].目前常用

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