Study On Magnetic Aiding Electrochemical Treament Of Dyeing Wastewater By Alternate Low Voletage Pulse

As the prompt development of the dyestuff industry , the waste water that discharged by in the production of those factories is the main pollutant source.Because of the complex dyestuff quality,production technology and dyeing technology, the quantity and the composition of the wastewater is largely different. However this kind of wastewater has common characteristic such ashigh-concentration, high-chromaticity, and high-COD, the treatement technology ofwastewater is the difficulty of industry wastewater treatment. Electrochemical process for dyeing wastewater has attracted more and more attention because it has so much merit such as simple manegement , little size demand of equipment, high COD removal rate.In this research subject, the methyl orange wastewater is treated by application of alternate low voltage pulse electrochemical method using three cheap anodes. The treatment effect of removal of COD and chromaticity of the dyeing wastewater at different wastewater concentration .different current intensity , different wastewater retention time and different pulse frequency is studied , Results show that the low voltage pulse electrocoaguitation method has the significant efficiency for removing COD and chromaticity of the dyeing wastewater and it is a prospective treatment method. On the basis of the treatment result for this wastewater , the most efficient and cheapest anode has been found.The experiment of alternate low voltage pulse electrochemical method using Fe anodes was studied.The suitable technology paraments were gained: For sample l,that COD value is 656 mg/1 and chromaticity value is 350, as instant maximal current intensity is 8A(current density 0.044A/cm2) and effluent capacity is 25ml/min, the chromaticity removal rate and COD removal rate could reach 82%, 72%, chromaticity and COD of the remain effluent is 63,183mg/1, which could attain to grade I in the Discharge standard of water pollutants for dyeing and finishing of textile industry ; when instant maximal current intensity is lA(current density 0.004A/cm2), the chromaticity removal rate and COD removal rate could reach75%,68%, chromaticity and COD of the remain effluent is 74,214mg/1, which could attain to grade II in the Discharge standard of water pollutants for dyeing and finishing of textile industry;For sample 2,which COD value is 459mg/1 and chromaticity value is 240, as instant maximal current intensity is 8A(current density 0.044A/cm2) and effluent capacity is 50ml/min, the chromaticity removal rate and COD removal rate could reach 84%,61%, chromaticity and COD of the remain effluent is 38,179mg/1, which could attain to grade I in the Discharge standard of water pollutants for dyeing and finishing of textile industry ; when instant maximal current intensity is 2.5A(current density 0.014A/cm2), the chromaticity removal rate and COD removal rate could reach 80%,59%, chromaticity and COD of the remain effluent is 48, 188mg/l, which could attain to grade II in the Discharge standard of water pollutants for dyeing and finishing of textile industry .This study can provide the possibility of the large scale industrialization of this method.