磷酸铁生产废水预处理高效沉淀池出水浊度高的原因及改进措施  

Reasons and improvement measures for high turbidity of overflow water from high-efficiency sedimentation tank for pretreatment of wastewater from iron phosphate production

作　　者：张忠朝 ZHANG Zhongchao(Yunnan Yunjuneng New Material Co.,Ltd.,Anning 650300,China)

机构地区：[1]云南云聚能新材料有限公司,云南安宁650300

出　　处：《生态产业科学与磷氟工程》2025年第3期94-98,共5页Eco-industry Science & Phosphorus Fluorine Engineering

摘　　要：云南云聚能新材料有限公司100 kt/a磷酸铁装置采用铵法工艺生产,产生大量母液和洗水,加入氨水调节pH后,再通过高效沉淀池沉降除去磷酸铁悬浮物及铁、镁、钙、锰等金属离子,高效沉淀池溢流液出水浊度大于10 NTU,严重影响后续处理,系统负荷低。从预处理反应池pH控制、高效沉淀池结构设计、水处理药剂选型、药剂量与进水量匹配、絮凝池搅拌强度等方面分析高效沉淀池沉降效果差的原因,并从设备、工艺技术和工艺管控方面进行改进。技改实施后,铵法磷酸铁生产废水预处理高效沉淀池母液、洗水处理量可达到设计能力;高效沉淀池出水浊度可有效控制在5 NTU以下,提高了系统运行负荷。The 100 kt/a iron phosphate plant of Yunnan Yunjuneng New Material Co.,Ltd.adopts the ammonium process,which generates a large amount of mother liquor and washing water.After adjusting the pH by adding ammonia water,the iron phosphate suspension and metal ions such as iron,magnesium,calcium and manganese are removed by sedimentation in a high-efficiency sedimentation tank.The turbidity of the overflow water from the high-efficiency sedimentation tank is greater than 10 NTU,which seriously affects the subsequent treatment and the system has a low load.The reasons for the poor sedimentation effect of high-efficiency sedimentation tank are analyzed from the aspects of pH control of pretreatment reaction tanks,design of high-efficiency sedimentation tank,selection of water treatment agents,matching of agent dosage and inlet water quantity,and mixing intensity of flocculation tank.Technological transformation is carried out,such as improving equipment,process technology and process control.After the implementation of technological transformation,the pretreatment capacity of wastewater in the high-efficiency sedimentation tank can reach the design capacity;The turbidity of the overflow water from the high-efficiency sedimentation tank can be effectively controlled below 5 NTU,increasing the operating load of the system.

关 键 词：磷酸铁 废水 高效沉淀池 溢流液浊度 原因 对策 

分 类 号：X703[环境科学与工程—环境工程]