Design And Application Of Non-thermal Plasma Dye Wastewater Treatment Equipment

This paper analyzes the characteristics,sources,hazards,treatment technology status and research current situation at home and abroad of dye industrial waste water.According to the main research factors and problems in practical application of low temperature plasma treatment technology,the author use anthraquinone dyes simulated wastewater and actual dye waste water as our research object.Meanwhile,the author design and optimize a dual-liquid two-phase medium discharge reactor applying to waste water treatment,discussing the causes of relevant results and providing a reference for the practical application of this technology.The dual dielectric barrier discharge water treatment reactor the author designed can take advantage of liquid circulation to reduce reactor temperature and therefore increase electrode life.It enhance gas-liquid mass transfer efficiency effectively by means of circulatory system and use high-energy electron,active group as major driving force in terms of discoloration and degradation of dye waste water.It has excellent processing effect.Taking actual dye waste water and its main pollutant components as processing object and combining the mechanism of plasma act on Alizarin Red S?ARS?,this paper investigated how liquid circulation flow,carrier gas flow rate,discharge power,initial concentration,initial pH value,Fe²⁺addition amount,H₂O₂ addition amount,tert-butyl alcohol addition amount affect on the removal rate of Alizarin Red S.The study shows,the removal rate of ARS goes down with the increase of carrier flow rate and initial pollutant concentration and increases with the increase of discharge power.Within the range of circulation flow of 0-52L/h,it increases as the circulating velocity increases;The removal rate and discoloration of target pollutants achieve the best effect when pH is neutral;When the author add a moderate amount of Fe²⁺and H₂O₂into the reaction system,it can promote the degradation of ARS by active groups validly,but inhibits the forward progression of the degradation reaction when the concentration is too high;In the whole process of removing contaminants,the content of·OH in reaction system plays a leading role in degradation and discoloration of organics.Under the optimal experimental conditions of ARS simulated dye waste water treated by discharge reaction,the degradation process of dye conforms to the apparent first-order reaction kinetics.When the discharge power is 43.5w,the liquid circulation flow rate is 52L/h,the carrier gas flow rate is 20mm/s,the initial concentration of the solution is 50mg/L,and the pH value is 7.21,the removal rate of ARS is94.6%and the discoloration rate reaches 90%.Taking actual dye waste water as a research subject,under optimal experimental conditions,discoloration rate and removal rate of organics can reach 80%and 52.2%respectively.External factors like initial concentration of solution,initial pH and circulating flow rate etc.have great influence on the degradation efficiency of organic matter and high correlation betthe authoren each other;Add Fe²⁺separately in this test did not promote the removal of organic matter;Ozone plays an important role in the degradation of organic matter in this process;After the treatment with non-thermal plasma technology,the biodegradability of waste water was greatly improved,and the B/C was increased from the initial 0.17 to 0.33.The waste water could meet the discharge standard after combining with the biochemical method.