摘要
为满足后续生物处理单元对固体悬浮物(SS)和铁浓度的进水要求,采用磁絮凝强化技术对厌氧消化污泥脱水液进行预处理。通过正交试验和单因素试验,本文考察了混凝水力条件、聚合氯化铝(PAC)投加量、聚丙烯酰胺(PAM)投加量、磁粉投加量及药剂投加顺序对磁絮凝效果的影响。试验结果表明:磁絮凝强化技术在快搅300r/min(2min)、慢搅100r/min(15min)、静置10min时,依次投加磁粉(40mg/L)、PAC(30mg/L)、PAM(4mg/L)时处理效果最好。在此运行条件下,SS和Fe^3+去除率分别为97.61%、98.24%、絮凝指数(FI值)取得最大值、zeta电位绝对值最小,絮凝效果最佳。与对照相比,磁絮凝强化技术对SS和Fe^3+去除率分别可提高3.70%和10.82%,同时絮体最大沉降速度可提高33%。磁絮凝技术处理后的出水不仅可以满足后续生物处理单元对SS和铁浓度的要求,还可以有效提高磁絮凝体的沉降速度,减小沉淀时间,具有较好的实用价值。
In order to meet the input water requirements of the concentrations of suspended solid(SS)and iron by subsequent biological treatment units,enhanced magnetic flocculation technology was used to pretreat the anaerobic digestion reject water.The effects of coagulation conditions,i.e.,poly aluminum chloride(PAC)dosage,poly acrylamide(PAM)dosage,magnetic powder dosage and the sequence of dosage on magnetic flocculation were investigated by orthogonal experiment and single factor experiment.The results showed that the enhanced magnetic flocculation technology had the best effect when magnetic powder(40mg/L),PAC(30mg/L)and PAM(4mg/L)were added in turn under the conditions of fast stirring of 300r/min(2min),low stirring of 100r/min(15min)and waiting for 10min.The removal efficiencies of SS and Fe3+were 97.61%and 98.24%,respectively.The best flocculation effect was observed with the maximum value of flocculation index(FI value)and the minimum absolute value of zeta potential.Compared with the control group,the removal efficiencies of SS and Fe^3+by magnetic flocculation were increased by 3.70%and 10.82%,respectively,and the maximum settling velocity of flocs was increased by 33%.The treated reject water by enhanced magnetic flocculation technology can meet the requirements of SS and iron concentration for subsequent biological treatment units.Moreover,it can effectively improve the sedimentation speed of magnetic flocs and reduce the precipitation time,which has a good practical value.
作者
徐博
池勇志
张红丽
赵建海
丁艳梅
张轶凡
李玉友
XU Bo;CHI Yongzhi;ZHANG Hongli;ZHAO Jianhai;DING Yanmei;ZHANG Yifan;LI Yuyou(School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Aquatic Science and Technology,Tianjin 300384,China;Tianjin Capital Environmental Protection Group Co.,Ltd.,Tianjin 300381,China;Graduate School of Engineering,Tohoku University,Sendai 980-8579,Japan)
出处
《化工进展》
EI
CAS
CSCD
北大核心
2020年第11期4693-4701,共9页
Chemical Industry and Engineering Progress
基金
天津市科技计划(19JCTPJC47000)
水体污染控制与治理科技重大专项项目(2015ZX07306001)。
关键词
磁絮凝强化
厌氧消化污泥脱水液
正交试验
单因素试验
混凝
enhanced magnetic flocculation
anaerobic digestion reject water
orthogonal experiment
single factor experiment
coagulation
