污水处理厂尾水深度化学除磷的实践研究  

Practical Study on Enhanced Removal of Phosphorus from Effluents in WWTP by Chemical Precipitation

作　　者：郭玉彪 GUO Yubiao(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China)

机构地区：[1]中铁第五勘察设计院集团有限公司,北京102600

出　　处：《铁道建筑技术》2024年第2期210-214,共5页Railway Construction Technology

基　　金：中铁第五勘察设计院集团有限公司科技研发计划项目(T5Y2020-B11)。

摘　　要：通过模拟小试与生产性试验双场景测试,为典型水质的化学深度除磷提供技术支撑。当出水总磷指标(TP)要求≤0.4 mg/L限值时,除磷效果以聚合氯化铁性价最优,优选采用同步或协同后置多点投药方式。对于高含磷、低碱度进水特征的污水处理厂,需关注投药带来的碱度、pH值等环境控制参数以及生化活性污泥性状的变化。当进水为高含磷条件时,单点的“药剂投加质量浓度”宜控制在经验推荐范围内。除磷加药点位宜选在曝气池末端与二沉池之间,二级处理出水进入三级处理滤池前的沉淀首段。尾水前宜设良好的精过滤单元,以消除固体悬浮物(SS)对出水非溶解性TP的影响。生产应用时,药剂投加系数β均值小于1.7 mol Fe/mol P;每去除1 mg/L的TP,吨水药耗小于0.015元。化学除磷需进行精准加药优化控制。Through dual-scenario testing of jar tests and productive tests,technical support was provided for chemical deep phosphorus removal from typical waste water.The results showed that PFC(poly ferric chloride)had a better effect on phosphorus removal when TP concentration of effluents below 0.4 mg/L.Fine filtration was suggested after simultaneous phosphorus removal or post chemical dosing.For WWTP with high phosphorus content and low alkalinity,the changes of environmental control parameters such as alkalinity,pH value,and characteristics of biochemical activated sludge should be focused when dosing chemicals.When the influent contains high phosphorus substances,the single-point′dosing mass concentration′should be controlled within the recommended range of experience.The phosphorus removal dosing point was suggested between the end of the aeration tank and the secondary sedimentation tank,or the first section of the precipitation before the secondary treatment effluent entering the tertiary treatment filter.Fine filtration unit should be set before effluent to eliminate the effect of SS on the insoluble TP.During the operation of WWTP,the average value of the dosage coefficientβis less than 1.7 mol Fe/mol P and the cost of per mg/L TP removal was below￥0.015/m 3.Precise dosing optimization control should be applied to chemical phosphorus removal.

关 键 词：污水 提标 深度除磷 药剂优选 精准加药 

分 类 号：X52[环境科学与工程—环境工程]