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고농도 암모니아성 폐수의 질산화과정에서 아질산염 축적의 영향인자
한동중,강성환,임재명 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
This study was focused to find how each factors effect on the biological nitrification in wastewater treatment under high ammonia nitrogen concentration. Batch reactors in aerobic conditions were used to test the treatment efficiency of mixed liquor, nightsoil and piggery wastewater. The results are summeried as follows ; Initial ammonia nitrogen concentration and pH were the direct influencing factors of nitrite build-up. More than 250mg NH_(4)^(+)-N/L in initial concentration built up nitrite and then the inhibition rate to Nitrobacter was above 70 percentage. And maximum nitritation rate was showed at pH 8.3 and nitrification could be completely achieved by pH control. Temperature and dissolved oxygen were the indirect influencing factors of nitrite build-up. These were a great effect on the activity of nitrifying microbes and ammonia nitrogen removal. Maximum nitritation late was showed at 30℃. The effect of DO concentration was negligible at more than 3 mg/L.
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한동중,류재근,임연택,임재명 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
This research aims to remove nitogen in the piggery wastewater by combined process with upflow anaerobic sludge blanket(UASB) and biofilm process. For the effective denitrification anaerobic and anoxic reactors were connected to a reactor. The effluent of aerobic reactor was recycled equally with influent in the upper filter of anaerobic reactor for denitrification and outlet of UBF reactor was connected to the settling tang with 1.5ℓ capacity and the settling sludge was repeatedly recycled to UASB zone. The organic loading rate of total reactor was operated from 0.4 to 3.1kgCOD/㎥/d and it was observed that the removal rate of TCOD was 80 to 95 percentage AMMonia nitrogen was removed over 90 percentage in the less volumetric loading rate than 0.1 kgN/㎥/d But because of non-limitation of organic materials, it was reduced to 70 perventage in the more volumetric loading rate than 0.6kgN/㎥/d But denitrification rate was observed 100 percentage in the all of loading rate. This is caused by the maintenance of optimum temperature, surfficient carbon source and competition of observed with the 71.7 percentage of influent COD. It was revealed that the most part of organic materials was removed in the aerobic and the anaerobic reactor because 38.4 percentage was conbersed into CH_(4) gas and 11 percentage was removed in the aerbic reactor with cell synthesis and metabolism. Besides, 5.7% organics was used to denitrification reaction and 3.7% organics related to sulgate reduction.
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