Performance of the bacterial-algal symbiosis system on treating oxytetracycline production wastewater
Due to its poor biodegradability and strong biological inhibition,the oxytetracycline(OTC)production wastewater poses challenges for conventional activated sludge processes facing high energy consumption and low efficiency.In contrast,as an emerging technology,the bacterial-algal symbiosis system are expected to achieve breakthroughs in the field of conventional biological wastewater treatment due to its high efficiency and low energy consumption.However,the research on using bacterial-algal symbiosis system to treat antibiotic production wastewater is still in its infancy,and related applications have not yet been widely developed.Therefore,in this study,the performance of aerobic activated sludge and bacterial-algal symbiosis systems was systematically investigated and compared on treating OTC production wastewater with different influent OTC concentrations.The results showed that the bacterial-algal symbiosis systems outperformed the activated sludge systems in terms of wastewater treatment efficiency and system stability with or without OTC stress.When the OTC concentration was 10 and 50 mg·L-1,the bacterial-algal symbiosis systems were relatively unaffected,COD and NH4+-N removal rates maintained around 75％and over 97％,respectively.However,the activated sludge system exhibited significant negative impacts,including reductions in the removal rates of COD,nitrogen,and OTC,as well as notable fluctuations in extracellular polymeric substance content and superoxide dismutase activity.When the OTC concentrations increased to 100 and 300 mg·L-1,both systems showed obvious inhibitory effects.Not only did the removal rates of COD and NH4+-N significantly decrease,but also the polysaccharide and protein content in the extracellular polymeric substances of the sludge microorganisms decreased significantly,as well as superoxide dismutase activity,thereby affecting the stability of the systems.
bacterial-algal symbiosis systemantibiotic production wastewaterhigh ammonium
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维普
