腐殖土对污泥沉降和脱水性能的影响及其机理  

EFFECT AND MECHANISM OF HUMUS SOIL ON THE SETTLING AND DEWATERING PROPERTIES OF ACTIVATED SLUDGE

作　　者：魏传银 马玉华 吴敏[2] 潘孝辉[2] 朱睿 WEI Chuan-yin;MA Yu-hua;WU Min;PAN Xiao-hui;ZHU Rui(China Nuclear Power Design Co. , Ltd （Shenzhen） ,Shenzhen 518172,China;State Key Laboratory of Pollution Control and Resources Reuse, Tongji University,Shanghai 200092,China;Innovator Environmontal Science and Technology Development Co. , Ltd, Shanghai 200233, China)

机构地区：[1]深圳中广核工程设计有限公司,广东深圳518172 [2]同济大学污染控制与资源化研究国家重点实验室,上海200092 [3]英勒斐特环境科技发展有限公司,上海200233

出　　处：《环境工程》2018年第5期145-149,138,共6页Environmental Engineering

基　　金：上海市国际科技合作基金项目(062307039)

摘　　要：主要研究了腐殖土对活性污泥脱水和沉降性能的影响机理。结果表明:腐殖土能够改善活性污泥沉降和脱水性能。腐殖土与活性污泥最佳接触时间为3 h。随着接触时间变化,污泥沉降和脱水性能变化与腐殖土析出的一价和二价阳离子M/D比值一致。腐殖土析出阳离子对改善活性污泥沉降和脱水性能起重要作用。二价阳离子Ca^(2+)、Mg^(2+)对于对改善污泥性能起正面促进作用,而污泥沉降性能和脱水性能受一价阳离子K^+、Na^+影响较小。SVI值随腐殖土和等效阳离子投加量增加而显著增加,ZSV也相应增加。而CST值随腐殖土和等效阳离子投加量增加而减少。此外,随着腐殖土投加量增加,污泥索太尔径和体平均径都明显降低,污泥粒径累积分布曲线上各百分比对应的粒径明显降低,污泥絮体结构发生变化,污泥的脱水性能和稳定性能得到改善。This study investigated the effect of humus soil and cations on the settling and dewatering properties of activated sludge. The results from experiments indicated that humus soil could enhance the settling and dewatering of activated sludge.The best contact time of humus soil and activated sludge was 3 hours. The change of settling and dewatering was accordant with the M/D ratio. Cations leaching from the humus soil played an important role in improving settling and dewatering of activated sludge. Divalent cations,Ca^2＋ and Mg^2＋,had positive effect on the sludge characteristics,while the settling and dewatering was not affected or slightly deteriorated by the monovalent cations,K^＋ and Na^＋. Reduction of sludge volume index（ SVI）with an increase of humus soil or equivalent cations addition was remarkable,while the zone setting velocity（ ZSV） increased.The capillary suction time（ CST） decreased with increasing dosage of the humus soil power or equivalent cations. While,sludge solid content was calibrated against the humus soil or equivalent cations. Improvement in dewaterability of the sludge by addition of humus soil was higher than that of equivalent cations mixture. With the time,the humus soil also could enhance the settling and dewatering of the sludge. The results also indicated that the sauter average diameter and volume average particle size decreased significantly. Sludge flocculated structure was dramatically destroyed and the settling and dewatering process were enhanced by the humus soil.

关 键 词：腐殖土 沉降性 脱水性 阳离子 污泥粒径 

分 类 号：X703[环境科学与工程—环境工程]