Research On The Removal Of Conventional Contaminants And Sulfamethoxazole By Micro-aerobic SBR

In recent years,with the increase of drug dosage,pharmacologically active compounds(Ph ACs)have gradually become an environmental concern because of their fate and influence on human health and natural ecosystems.Because of the non-degrade properties of Ph ACs,most of the treatments used physical or chemical methods.Few researchers used biologic methods to degrade them.This has caused problems such as high processing costs and the need for new chemical processing facilities.Because of its unique redox potential environment,the micro-aerobic bioreactor has many advantages such as high microbial diversity,long food chain,and high total nitrogen removal efficiency.Because there are many different biochemical reactions,they may have better removal effects for Ph ACs in the micro-aerobic bioreactor.At present,the researcher's research on micro-aerobic status mostly stays in the treatment effect of different drugs,and do not deeply analyze the influence of parameters such as ORP and mixed system on the treatment effect,and there is no deeper understanding of different metabolic processes in micro-aerobic environments.In this paper,the micro-aerobic SBR reactor is used as the main body,and the effect of ORP on the treatment effect of the reactor is studied by running under different ORP.The influence of suspended sludge and mud membrane system on the treatment effect was studied by adding biological fillers.Different substrates were used to perform the nitrification reaction,denitrification reaction and the corresponding typical micro-aerobic metabolism in the micro-aerobic SBR reactor to study the contribution of different metabolic processes to the removal of SMX.At the same time,the metabolic process of nitrogen-containing compounds by micro-aerobic SBR was studied.It is hoped that this study can better understand the rules and details of the metabolic degradation of organic matter in the micro-aerobic process.The micro-aerobic SBR reactor has a better operating effect in a higher ORP environment.Mud membrane reactors have a better shock load than suspended activated sludge reactors,and will further reduce the concentration of COD,NH4+-N and SMX in the effluent,and the suspended activated sludge in the mud membrane system.Has better settling properties.When the micro-aerobic SBR mud system is operated under MLSS of 3 g?L-1 and HRT of 8 h,the removal efficiency of COD,NH4+-N,TN and SMX could achieve 87%,90%,89% and 68%,respectively.The removal of NH4+-N in the microoxidation SBR reactor mainly depends on autotrophic nitrification,and the removal of NO3-mainly depends on heterotrophic denitrification.Both autotrophic nitrifying bacteria and heterotrophic bacteria can be biodegraded or transformed by using SMX as a co-metabolism substrate in metabolic processes.Autotrophic nitrification,heterotrophic denitrification,and typical micro-aerobic SBR metabolism in MLSS were 1.5 g?L-1,HRT was 12 h,and influent SMX concentration was 0.05 mg?L-1.Under the conditions,the degradation rates of SMX were 40.61%,27.51% and 60.59%,respectively.Combined with the time-varying curve of the concentration of SMX in a typical micro-aerobic SBR reactor,the main degradation pathway of SMX in the micro-aerobic SBR reactor is the co-metabolism of ammonia-oxidizing bacteria in the process of oxidizing NH4+-N,followed by the co-metabolism of heterotrophic bacteria in the metabolism of organic compounds.