摘要
为提高氯化铁混凝剂的混凝性能并减少膜污染,以四氧化三铁为磁种,利用剩磁对氯化铁混凝剂聚合态进行调控,并进行混凝-膜过滤实验,分析磁化干预对混凝剂形态分布和处理效果的影响。结果表明:在0.2T的磁干预强度下磁化之后的磁种悬浊液存在剩磁,磁化3min时,剩磁达到最大;水解过程中Fea逐渐转化为Fec,而通过外磁场干预,一定程度上抑制了混凝剂由低聚态向高聚态的转化,且剩磁越大,低聚态含量越多,被磁化3min的磁种影响后70mg/L的氯化铁溶液中Fea+b约占总铁含量的26.3%,比不磁化和磁化9min时分别高出了8.2%和5.7%;在混凝-膜过滤过程中,磁化3min时絮体尺寸最大,约为750μm,膜通量为105L/(m^2·h),远大于直接过滤的膜通量45L/(m^2·h),膜通量下降最慢,反洗之后膜通量恢复到90%以上,恢复程度最佳。。
In order to improve the coagulation performance of ferric chloride coagulant and reduce membrane fouling,the residual magnetic flux density of ferriferrous oxide as magnetic seed was used to regulate Fe(Ⅲ) species,and the coagulation-membrane filtration process was carried out to analyze the influences of magnetization intervention on the morphological distribution and treatment effect of coagulants. The results show that the residual magnetic flux densities of the Fe3O4 suspension appear after magnetization under the magnetic field strength of 0.2 T. When the magnetization time is 3 min,the residual magnetic flux densities are maximun. During the hydrolysis process,Fea gradually converts to Fec,and through the external magnetic field intervention,the conversion progress is inhibited to some extent,and the larger the residual magnetic flux densities,the more amount of Fea+b . When 70 mg/L FeCl3 solution is affected by the magnetic seed magnetized for 3 min,Fea+b accounts for 26.3% of the Fe(Ⅲ),which is 8.2% and 5.7% higher than that of non-magnetization and magnetization 9 min respectively. In the coagulation-membrane filtration process,when the magnetization time is 3 min,the floc size is the largest about 750 μm,and the membrane flux arrives 105 L/(m^2·h) which is much larger than that of direct filtration (45 L/(m^2·h)),and the membrane flux decreases at the lowest rate. After backwashing,the membrane flux recovers to over 90% and the recovery was optimal.
作者
贾辉
郝胜男
李娟
温海涛
陶正源
王捷
JIA Hui;HAO Sheng-nan;LI Juan;WEN Hai-tao;TAO Zheng-yuan;WANG Jie(State Key Laboratory of Separation Membranes and Membrane Processes,Tiangong University,Tianjin 300387,China;School of Environmental Science and Engineering,Tiangong University,Tianjin 300387,China;Tianjin Engineering Center for Safety Evaluation of Water Quality & Safeguards Technology,Tiangong University,Tianjin 300387,China)
出处
《天津工业大学学报》
CAS
北大核心
2019年第5期14-19,共6页
Journal of Tiangong University
基金
国家自然科学基金资助项目(51638011,51578375)
中国博士后科学基金资助项目(2017M621081)
关键词
铁盐聚合态
磁场
混凝
膜过滤
干预机制
膜污染
氯化铁混凝剂
Fe(Ⅲ) species
magnetic field
coagulation
membrane filtration
intervention mechanism
membrane fouling
ferric chloride coagulant
作者简介
通信作者:贾辉(1979-),女,博士,教授,主要研究方向为膜法水处理.E-mail:wangjie@tjpu.edu.cn.
