Reaearch On The Removal Of Heavy Metals In Sewage By Iminodisuccinic Acid

Along with the advancement of modernization, the sludge increasing more and more disturbs thesewage plant. If wrongly treated, it also could jeopardize the eco-safety and human health, and result in thewaste of resources and economy. There are lots of nutrients such as nitrogen, phosphorus and kalium,which make it possible for the sludge to reuse. But there are also large concentrations of heavy metals inthe sludge restricting the sludge reuse. Therefore, it is urgent to solve the problem that how to reduce theheavy metals in the sludge and make the concentrations fulfill the reuse criteria. The experimental study isconducted to remove and reduce the poisonous heavy metals from municipal sludge, especially thoseelements surpassed the national criteria.The heavy metal pollution in sewage sludge in China has not been paid attention for, The workstarted late, has not formed the scale. Therefore, the treatment of heavy metals in sludge to the fewexamples, the development of new technology for heavy metal sludge treatment is particularly importantand urgent. How to use the green chemistry theory to solve the problem of heavy metal pollution in sludgeis one of the hotspot in Environmental Science research.In this paper, according to the international development trend of green chemistry, aiming at thecharacteristics of heavy metal content of sludge in the city high, the residual sludge in Xinxiang batteryproduced by the plant as the research object, on the analysis of the basic properties of sludge and the formof existence basis, Focuses on the extraction process of heavy metals in sludge with the biodegradation ofthe iminodisuccinicacid (ISA). The effects of extraction system for the extraction time, extractiontemperature, PH value, chelating agent usage, add the H3PO4conditions on the extraction of heavy metaleffects, the best extraction conditions obtained.The experimental results show that:(1) ISA has a good effect on the removal of heavy metals in sludge, when the molar ratio of totalheavy metals ISA and sludge in the8:1and in the case of PH=4, the best extraction effect of ISA on sludgein the target of heavy metals, the extraction of heavy metals in sludge in the order of Cd>Ni> Cu.(2) Use the extraction time, temperature,PHvalue, chelating agent and heavy metals in the sludge inthe form of existence is an important factor that influences the effect of heavy metals in sludge extraction. (3) the low concentration of H3PO4has a good effect on the separation of heavy metals in sludge, Andwhen the chelating agents interact with sludge，The extraction effect of heavy metal Cd、Ni、Cu isbetter than others.In addition, this article discussed the removal mechanism to get rid of heavy metals in sludge withIminodisuccinic acid briefly.