Treatment of high total nitrogen wastewater by autotrophic sulfur denitrification biological filter process
High TN wastewater(mixed by nitrochlorobenzene advanced oxidation effluent and biochemical effluent)of a petrochemical enterprise was treated by an autotrophic sulfur denitrification biological filter process.Pilot test(20-80 m3/d)and engineering application(250-270 m3/h)were both carried out.Satisfactory performance was obtained in a pilot test,with the average TN and NO3--N removal efficiency of 95.2%and 96.5%,respectively.The residual H2O2 and alkalinity deficiency in wastewater significantly inhibited the nitrogen removal effect,and the effect could be improved by controlling the H2O2 concentration and supplementing alkalinity appropriately.During the engineering application,the average influent TN was 47.3 mg/L,the average TN removal efficiency was 95.5%,and the average effluent TN was 2.19 mg/L,which met the requirements of Jiangsu Provincial standard of DB32/939-2020.Compared with the traditional heterotrophic denitrification nitrogen removal process,this process did not require organic carbon source addition,which avoided effluent COD excess.As no CO2 was produced during operation,CO2 emissions were reduced by about 930 t/a,which effectively responds to the"double-carbon"strategy.Besides,the operation cost of this process was reduced by about 50%.
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