Co-flocculation mechanism and physical model

Analysed and summarized the dynamics and chemical factors in the co (co-agulation)-flocculation process. A completely new definition for co-flocculation was given. If a colloid particle didn抰 contact with drug to emerge (physical) chemical effect, the possi-bility for the colloid particle to coagulate (flocculate) was rather small, only at the floccula-tion stage; it may be caught by net or settled by differential sedimentation. Base on sev-eral assumed important premises, the several steps and physical model of co-flocculation process were given, and the mixing, coagulation and flocculation were proposed accord-ing to their essentiality.

武汉汉西污水处理厂提标工程设计与运行

武汉汉西污水处理厂工程规模为60×10^(4)m^(3)/d,原出水水质执行《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级B标准,尾水通过李家墩明渠排入府河,并最终汇入长江。提标工程在充分利用现有二级生物处理系统的基础上,采用絮凝-沉淀-过滤的深度处理工艺,将出水标准提升至GB 18918—2002的一级A标准。通过集约化布置深度处理构筑物,解决了用地紧张的问题。对深度处理进水接驳及改造进行精细化设计,在整个项目施工过程中,现状工程仅在深度处理进水接驳时短暂停产。采取构筑物防淹水安全措施后,仅在夏季汛期才启动尾水提升泵进行强排,其余时段整个深度处理均可实现尾水自排,极大节约了能源和运行费用。通水运行后,目前该工程实际处理规模约(63~65)×10^(4)m^(3)/d,超负荷运行6%左右,尾水各项指标优于一级A标准。