磷石膏堆场渗滤液短流程处理中的全化学工艺技术  

A Study of All Chemical Process Technology in Short Process Treatment of Phosphogypsum Storage Yard

作　　者：董亮[1] DONG Liang(CNSG Anhui Hong Sifang Co.,Ltd,Hefei 231604,China)

机构地区：[1]中盐安徽红四方股份有限公司,安徽合肥231604

出　　处：《安徽工业大学学报（自然科学版）》2023年第4期429-433,共5页Journal of Anhui University of Technology（Natural Science）

基　　金：中盐集团重点项目(HSFXJ19031087C)。

摘　　要：针对现有磷石膏渗滤液处理工艺存在流程长、药剂成本高、A/O脱氮能力不足等问题,设计一种以沉淀除磷、氟,还原降硝态氮及氧化脱氨氮为基础的全化学处理工艺,考察石灰乳投加量、酸碱度、氧化剂投加量、絮凝剂等因素对磷、氟、氨氮、总氮去除效果的影响,优化中试规试验参数,评价工艺持续运行2个月的实际执行效果。结果表明:在铁基复合材料作用下,硝态氮还原率高达67%,中性条件下的氨氮能被次氯酸钠氧化殆尽;经二级石灰乳沉淀后渗滤液中总磷及氟离子质量浓度均值稳定在0.37,1.50 mg·L^(-1)附近;设计的工艺具有投资少、流程短、效率高、速度快、药剂省等特点,出水指标满足DB 34/2710-2016标准,可为同类型磷石膏渗滤液达标治理提供新的思路。In view of the problems of long process,high reagent cost,and insufficient A/O denitrification capacity in the existing phosphogypsum leachate treatment process,a full chemical treatment process based on precipitation phosphorus and fluorine removal,reduction of nitrate nitrogen and oxidation ammonia nitrogen removal was designed.The effects of factors such as lime milk dosage,pH,oxidant dosage,and flocculant on the removal efficiency of phosphorus,fluorine,ammonia nitrogen,and total nitrogen were investigated.The parameters of the pilot scale experiment were optimized,and the execution effect of the process running continuously for 2 months was evaluated.The results show that under the action of iron based composite materials,the reduction rate of nitrate nitrogen is as high as 67%,while ammonia nitrogen can be completely oxidized by subsequent sodium hypochlorite under neutral conditions.In addition,the average concentrations of total phosphorus and fluoride ions in the leachate after secondary lime milk precipitation remain stable around 0.37,1.50 mg•L^(−1) respectively.The process has the characteristics of low investment,short process,high efficiency,fast speed and low reagent consumption.The effluent indicators meet the standard of DB 34/2710-2016,which can provide new ideas for the treatment of same type of phosphogypsum leachate up to standard.

关 键 词：磷石膏渗滤液 化学处理技术 短流程 排放限值 

分 类 号：X703.1[环境科学与工程—环境工程]