摘要
对进水中Na+,Ca2+和Fe3+冲击对膜生物反应器(MBR)运行的影响进行了探讨。实验结果表明:进水中3种金属离子冲击对MBR去除COD影响较小,适量质量浓度的Fe3+有利于NH3-N的去除,然而Na+与Ca2+对NH3-N去除影响不明显;进一步研究发现进水中Na+将引起反应器内上清液(SMP)质量分数上升,从而增加膜过滤阻力;进水中Fe3+质量浓度为50 mg/L时显著降低本体溶液中SMP质量分数,有利于减缓膜污染,而当Fe3+质量浓度为150 mg/L时SMP质量分数升高,使膜污染率升高;研究中也发现进水中Ca2+在50或150 mg/L时都可有效地减缓膜污染,进水中金属离子质量浓度与EPS中TB质量分数关系密切。
The influence of Na^2＋ , Ca^2＋ and Fe^3＋ on the operating performance in membrane bioreactors （MBRs） was investigated. The results show that the metal ions have a slight effect on the removal of chemical oxygen demand （COD） in MBRs. The optimal mass concentration of Fe^3＋ is favor of removing NH3-N while Na^2＋ or Ca^2＋ has a negligible effect. Moreover, Na^2＋ in influent results in the increase of soluble microbial products （SMP） in supernatant, which obviously increases the membrane resistance. Fe^3＋ in influent with the mass concentration of 50 mg/L reduces the mass fraction of SMP in bulk and retards the membrane fouling in MBR. However, the mass fraction of SMP in bulk increases when the dosage of Fe^3＋ equaled to 150 mg/L, which increases the membrane fouling rate. It also reveals that the introduction of Ca^2＋ leads to membrane fouling mitigation under its mass concentration of 50 or 150 mg/L . The metal ions in influent are closely associated with tightly bound （TB） in extracellular polymeric substances （EPS） in MBRs.
出处
《化学工程》
CAS
CSCD
北大核心
2013年第7期60-63,68,共5页
Chemical Engineering(China)
基金
吉林省科技发展计划项目(20120404)
中国电机工程学会电力青年科技创新资助项目(2009)
吉林市杰出青年基金项目(20106306)
吉林市科技支撑社会发展计划项目(201232403)
关键词
膜生物反应器
金属离子
胞外聚合物
溶解性微生物代谢产物
膜污染
membrane bioreactor
metal ions
extracellular polymeric substances
solubility microorganism metabolites
membrane fouling
