Try And Reserch On Chroma And Cyanide Treatment Of Coke Plant Wastewater

Components were complex in coke plant wastewater,in which contains refractory organic compounds such as tar, benzene, phenol, cyanide, quinoline and pyridine etc.So chroma of that is high ,and great changes happened usually to water quality and water flow. It is a typical industrial wastewater,in which contains a number of toxic and nocuousness compounds. The biological treatment processes deal with coke plant waste water, which chroma and cyanide of removal rate are not favorable and the effluent concentration couldn't attain the wastewater drainage level,which brought severe harm to our environment and human body. It had been demonstrated that adopting flocculating anddepositing-oxidation deal with cyanide and reduce chroma in coking-plant wastewater after bioglogical treatment process is a cost effective technology.In this research ,with the use of M3SO4, PAC, PFS, PAM ,NaClO, ClO2 ect.alone or combination ,dealing with cyanide and reducing chroma in coking-plant wastewater was analysed and researched. Besides with the way of experiment ,the best of throwing agents project and quantity of agents was suggested . The results are as follows:1.Using alone the way of flocculating and depositing, it was the best relatively method that adopt PFS and PAM as flocculation agents ,when quantity of PAM is 4.0 mg/L and others change from 5 mg/L to 50 mg/L. Removal rate of cyanide was about 60%;that of chroma was about 40%.This project couldn't make the effluent concentration of cyanide and chroma in coking wastewater attain the wastewater drainage level.2. Using alone the way of oxidation, it was the best relatively method that adopt C1O2 as oxidation agents when quantity of oxidation change from 4 mg/L to 40 mg/L. Removal rate of cyanidewas about 85%;that of chroma was about 60%.This project could make the effluent concentration of cyanide in coking wastewater attain the wastewater drainage level,but chroma of which couldn't.3. Among the flocculation agents ,PFS was affected by pH on the small side,and it counld attain better removal rate. ClO2 was affected by pH distinctly, Removal rate of cyanide and chroma were perfect, the pH of value among 8 and 10.4. Removal rate of cyanide and chroma were affected by temperature prodigious.When the water temperature was less than 20 degree Celsius , Removal rate of cyanide and chroma were not favorable. When the water temperature was more than 25 degree Celsius, Removal effect of cyanide and chroma were distinct.considering the temperature of effluent which was dealed with biological processes was 30 degree Celsius, so the experiment temperature was adopted as 30 degree Celsius.5.1 had find the best of quantity of throwing agents which deal with coke plant wastewater with method of perpendicularity experiment .The best of quantity of throwing agents are as follow:30mg/L, pH=10, p(C102)-20mg/L, p(PAM)-3.5mg/L .With thebest of quantity of throwing agents, removal effects are as follows: removal rate of chroma was 86.67%; removal rate of cyanide was 91.3%; removal rate of CODCr was 68.1%.