Process Design Of High Concentration Benzimidazole Wastewater Treatment Based On The Molecular Structure Of Conta Minants And Study On The Degradation Mechanism

Pesticide wastewater is the most difficult waste water in all kinds of industrial wastewater.The salient features of pesticide wastewater are,(1)the high concentration of organic matter contained in wastewater,(2)the pollution composition is complex and toxic,(3)lots of refractory materials,(4)most spill irritating odor.If the pesticide wastewater cannot be targeted for high-quality and efficient treatment,it would have a serious impact on the surrounding enviro nment,groundwater,etc.,and ultimately endanger human health.In this paper,the treated wastewater is rich in benzimidazoles,anilines,amides and other rich electronic materials,as well as some poor electronic materials such as cyanide,pyridine ammonia nitrogen,and sulfide.Based on the structure of substances,the color and discharge of wastewater,the micro-electrolysis(ME)coupled with fenton technique was chosen to degrade those industrial benzimidazole wastewater with high chemical oxygen demand(COD).In the process of Fe/C micro-electrolysis,alarge nulber of early ecological Felu and high chemical activity of radicals could be produced,which acting on the pollutants and the redox reaction took place?Also,the use of potential difference to produce the original cell reaction,so that the organic matter fracture and open-loop.The degradation of toxic macromolecules into biodegradable small molecules,and the organic matter in the reduction of electron groups into push electrons.Due to the increase in the density of organic electron after degradation,it is more conducive to the subsequent fenton oxidation reaction.Moreover,the production of small bubbles,which playing the role of air flotation.The colloidal particles in the waste water can be aggregated intolarge particles settling to improve the cod removal rate.During the fenton oxidation reaction,it can make full use of the H2O2 through the special feeding method.Therefore,the Fe2+ could efficiently catalyze H2O2 to produce a strong oxidizing ability of hydroxyl radicals,which induced series chain reaction,to degrade the toxic macromolecules into biodegradable small molecules.Finally,by adjusting the pH,the coagulation of ferric hydroxide produced by Fenton oxidation can be used to effectively reduce the cod in the wastewater.So that afer the coupled process,cod removal rate can reach more than 85.2%,BOD/COD value from 0.100 to 0.400 above,which greatly improve the biodegradability.At the same time,the coagulation sedimentation can be sold as iron ore,to achieve solid waste recycling.The main work of this paper is as follows:(1)By analyzing the composition and structure of the pollutants in wastewater,the Fe/C micro-electrolysis and fenton oxidation technology coupling to treat this pesticide water,which contains pyridine,cyanide,ammonia nitrogen,methyl chloride,aniline,sulfide,amide,aniline,imidazolone with its derivatives,benzene quinone and other refractory organic wastewater.The process parameters were optimized such as the Fe/C residence time,aeration rate,fenton reaction time,and the addidtion way of H2O2.(2)Through the treatment of each single section wastewater separately,looking for reasons that hinder the efficiency of the coupled process.Such as the phosphate ion concentration,and thus improve the overall process efficiency(3)The study on the configured benzimidazole wastewater treated by Fe/C microelectrolysis coupled with Fenton oxidation was carried out.And the degradation way of major pollutants in wastewater was deter mined by IR,UV and LC-MS.(4)Analysis of industrial processing cost and feasibility.