Theory And Applying Research Of Evolutionary Biological Method In Treating Typical Organics And Ammonia Wastewater

Water is one of the most common substances in the world.It is an important resource for all life and the most important part of the organism.However,with the rapid development of the economy,excessive emission of "three wastes" and a variety of pollution sources have seriously infringed water bodies,making the water ecology seriously damaged.In this study,the organic wastewater and ammonia nitrogen mixed wastewater were treated by the evolutionary biologic method.The evolutionary biolo pond was studied based on the characteristics of different sewage and operated separately for different wastewater.In the process of treating domestic sewage by evolutionary biological method,both COD and NH₄⁺-N have good processing ability through the process of starting and running of the reactor.In the process of starting,the removal rate of COD can reach 88%,and the removal rate of NH₄⁺-N can reach 50%.In operation,the removal rate of COD is stable at 90%.The removal rate of NH₄⁺-N is about 99%.The influent NO₂^--N changes in 0.03-0.98mg/L,and the effluent is in 0.4-15.34mg/L,and the influent changes in NO₃^--N at 0.71-7.49mg/L,and the effluent changes in 0.84-24.66mg/L.A COD degradation kinetics model for stable operation of the reactor was established.The relevant parameters of the model were determined by experiments,and the maximum specific rate of COD degradation was obtained,K was 2.5403mg/（G.H）,and the saturation constant Ks was 35.3709mgCOD/L.When treating landfill leachate,three parameters are studied by changing the parameters of biodegradability,water recovery and temperature.The starting process is 30d,the overall COD removal rate of the reactor can reach 80%,and the removal rate of NH3-N is more than 30%.To improve the biodegradability,it is divided into four stages.When the influent COD concentration is 3000mg/L,B/C=0.2,B/C=0.4,B/C=0.6.The influent COD is increased to 4000mg/L,B/C=0.6.With the improvement of biodegradability,the removal rate of COD and NH₄⁺-N increased gradually.The improvement of biodegradability has significant effect on the treatment of landfill leachate.When B/C>0.5,the treatment effect can reach the expected effect.In the study of reflux ratio,four groups of experiments were the reflux ratio was 0%,100%,200%,and 300%.With the increase of reflux ratio,the hydraulic residence time of each compartment is shortened,and the hydraulic load increases,which enhances the scouring effect of biofilm,and causes some bacteria to fall off from the carrier,and the removal rate decreases.When the reflux ratio is 200%,the removal rate of COD can reach 85%,the removal rate of NH3-N is 63%,and the best removal rate can be reached.In the temperature experiment,the low temperature condition was set at 10.The removal rate of COD and NH₄⁺-N decreased significantly,indicating that low temperature had a great influence on the treatment of landfill leachate by evolutionary biological method.In the treatment of dairy wastewater,because of the characteristics of dairy wastewater,it contains complex organic matter,and the hydrolysis acidification pool is added to the evolutionary biological pool,which is beneficial to its degradation.The hydrolytic acidification pool transforms large molecules into small molecules and adsorb a large amount of scum.In the evolution bioreactor,COD and NH₄⁺-N have good processing ability through the start-up and operation process of the reactor.The influent of COD is about 1000mg/L,and the effluent is below 50mg/L.The influent concentration of NH₄⁺-N is 40-50mg/L,and the effluent is below 2mg/L.At the same time,the evolutionary biological pool has an obvious treatment effect on the SS and chromaticity of dairy wastewater.Sludge measurement showed that with the increase of volumetric load,the suspended sludge concentration also increased,but it didn’t affect the effluent effect.When the sample was observed,the SV30 was about 5-20%,and the sludge settling effect was good without sludge bulking.