The Synthesis Of Heavy Metal Ion Capture Agent And It’s Application Research In The Treatment Of Wastewater That Contains Copper And Zinc

The fast development of modern industry has caused serious environmentproblems. The wastewater containing heavy metals is increasing year by year; theuse of various complexant makes the quality of the water to be more complex.Under the usage of the traditional chemical precipitation to process thewastewater, the heavy metal content is still high and It can’t even reach thedischarging standards. It makes the total amount of the heavy metals in theenvironment water higher and higher, which brings tremendous harm to waterenvironment for human beings.Taking effective treatment can reduce the amount of the heavy metals in theindustry wastewater; meanwhile it can avoid pollution for the second time, which hasimportant benefits to economy and environment.Dithiocarbamate is a kind of heavy metal treatment which is non-toxic, harmless,dosage less, easy-use, specific, process simple and sediments is recyclable. And this isthe research focus of environmental protection worker in recent years.According to the synthetic principle of dithiocarbamate, we synthesized a newtype of heavy metal chelating agent in the laboratory. Through plenty of experimentswe optimize the synthesis conditions of this heavy metal chelating agent, ensured it isthe specificity precipitant of Cu²⁺and Zn²⁺.The product synthesized base on this document is a laurel-green transparentliquid. All of the raw materials of this heavy metal chelating agent are innoxiouslyexcept aniline and carbon disulfide. By the little dosage of aniline and carbondisulfide is, the toxicity of the product is quite low, generally harmless toenvironment. The result showed that: this heavy metal chelating agent is dosage less, easy touse, specific, process simple and sediments are able to recycling. The order of theheavy metal ion capture ability is Cu²⁺>Zn²⁺>Cd²⁺>Mn²⁺>Ni²⁺>Pb²⁺, and the capturerate for Cu²⁺and Zn²⁺in industry wastewater is equal or greater than99%, which canfulfill national sewage discharge standard level after one time’s processing, themaximum removal for Cu²⁺and Zn²⁺respectively is15.95mg/ml and4.48mg/ml.In This text we optimized the process conditions of the heavy metal waste watertreatment, such as flocculant type and dosage, the response time of this heavy metalcapture agent for Cu²⁺and Zn²⁺, the trapping efficiency of this heavy metal captureagent for Cu²⁺and Zn²⁺when EDTA and ammonia complexing agent exists, as wellas the return to dissolve situation of the sediment. To lay a good foundation for theapplication of this heavy metal chelating agent.