Study on the Treatment of Rural Low C/N Wastewater by A New Type of Inverted A2/O Coupled MBR Process
In order to solve the problem of poor removal efficiency of pollutants and nutrients in rural low-C/N wastewater,the effect of organic load(OLR)on the treatment of rural low-C/N wastewater by inverted A2/O coupled membrane bioreactor(MBR)was investigated by controlling the influent pollutant concentration at medium temperature.The results showed that when OLR was increased from 150 to 450 mg/L,the removal efficiency of total nitrogen(TN)and dissolved phosphate(SOP)increased from 67.6% and 86.6% to 72.4% and 94.3%,respectively.The improved OLR reduced the removal of pollutants and nutrients by the combined process.In addition,the OLR could affect the characteristics of sludge in the new process,the increased OLR promoted the secretion of extracellular polymer(EPS),especially in the group with OLR of 600 mg/L,the content of EPS increased to 139.6 mg/g.The effect of influent OLR on EPS in the anoxic pool was greater than that of EPS in an anaerobic pool.The OLR can affect the activities of key enzymes related to pollutant and nutrient removal in the new process.When OLR was 450 mg/L,the key enzymes related to pollutant and nutrient removal were the strongest.The research results provide a theoretical basis and data support for the efficient treatment of low-C-pound N wastewater in rural areas.
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