摘要
在静态条件下,进行了活性污泥对净水中钙离子的去除实验研究和机理探讨。在去除实验中,考察了活性污泥用量、搅拌强度、搅拌时间、初始钙离子浓度、溶液pH对钙离子的去除效果的影响。结果表明:用活性污泥去除钙离子可以获得较好的效果,去除量可达19mg/g,并且去除速度很快,5min即可完成;且去除机理可能有生物吸附、静电吸附和化学沉淀;适当的剪切力可以加速吸附反应的进程,证实了流体力化学效应的的存在。溶液pH不同,发生的沉淀反应不同,低pH条件下,钙离子与活性污泥中磷酸根生成Ca3(PO4)2沉淀,较高pH条件下,生成的沉淀为Ca5(OH)(PO4)3。
Removal properties and mechanism as well impact factors of activated sludge on Ca2+ in treated water were experimentally studied. Results showed that activated sludge was quite feasible in removing calcium ions from treated water, with capacity up to 19mg/g and adsorption process finished in 5min. Removal mechanism may include biological adsorption, electrostatic adsorption and chemical precipitation. Fluid shear force had some effect on removal process, which proved that the effect of fluid force chemistry existed. The precipitation reaction was different in various pH conditions,resultant was Ca3(PO4)2 at low pH and Cas(OH)(PO4)3, at high pH.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2007年第8期10-12,50,共4页
Environmental Science & Technology
基金
国家自然科学基金资助项目(50574111)
关键词
活性污泥
钙离子
化学沉淀
生物吸附
静电吸附
流体力化学
activated sludge
calcium ions
chemistry precipitation
biological adsorption
electrostatic adsorption
fluid force chemistry
