WASTEWATER TREATMENT SYSTEM IMPROVING T-N QUALITY OF EFFLUENT WATER THROUGH PRE-TREATMENT OF REDUCING NITROGEN IN RETURNING WATER FROM DEHYDRATION PROCESS AT THE DIGESTION TANK OF COMMUNITY SEWAGE DISPOSAL PLANT

The present invention relates to a method for treating wastewater of a sewage treatment plant by a total nitrogen treatment of effluent countercurrent water in a digestion tank. By the technical features of the present invention, the effluent water quality improving method of a sewage treatment plant comprises: a first step of forming catalyst oxidation water in which an oxidizing material is formed by bringing aqueous solution, containing an oxidizing agent including sodium hypochlorite, into contact with a ceramic catalyst; a second step of chemically performing an oxidative decomposition for the nitrogen component of countercurrent water by mixing effluent countercurrent water generated in a digestion tank with the catalyst oxidation water; a third step in which the treated water of the second step passes through an MLE anaerobic denitrification process; a fourth step of oxidizing and decomposing the mixed liquid, which has passed the third step, by aeration in aeration facilities including microorganism; a fifth step of returning a part of the treated water, which has passed the fourth step, to an anaerobic treatment chamber of the third step and dividing the rest into upper water and sludge through a precipitation separation process; and a sixth step of returning the upper water of the fifth step to an initial sewage inflow tank of the sewage treatment plant. The present invention has an effect capable of planning the efficient and economical operation of facilities by reducing an organic concentration relatively and also reducing an air flow rate for oxidizing nutrients such as nitrogen by satisfying enhanced discharge standards by obtaining sufficient oxygen necessary for nitrification in aeration tank facilities of a limited capacity due to the total nitrogen load of mixed inflow water which is lowered generally by returning after lowering the total nitrogen concentration of effluent by primarily oxidizing and decomposing ammonia nitrogen with the catalyst oxidation water and secondarily performing deoxidization in an MLE biological process anaerobic tank. 본 발명은, 소화조 탈리액 반류수의 총질소 처리를 통한 하수처리장의 하폐수처리 방법에 관한 것으로,차아염소산나트륨을 포함하는 산화제가 함유된 수용액을 세라믹촉매에 접촉시켜 산화물질이 형성된 촉매산화수를 형성하는 제1 단계; 소화조에서 발생되는 탈리액 반류수와 상기 촉매산화수를 혼합시켜 반류수의 질소성분을 화학적 산화분해시키는 제2단계와; 상기 제2단계의 처리수를 MLE 무산소 탈질공정을 거치는 제3단계와; 제3단계를 거친 혼합액을 미생물이 포함된 폭기설비에서 폭기에 의해 산화분해하는 제4단계와; 제4단계를 거친 처리수 중 일부는 제3단계의 무산소처리조로 반송되고, 나머지는 침전분리공정을 거쳐 상층수와 슬럿지로 분리시키는 제5단계;그리고 상기 제5단계의 상층수를 하수처리장의 초기 하수유입 수조로 반류시키는