장기 배양법을 이용한 국내 하수처리장 유입 하수의 질소 성상 분석
Analysis on Nitrogen Faction of Influent Sewage in Domestic STP Based on Long-term Incubation Method
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현재 국내 하수처리장 방류수 질소 수질 기준 개정의 필요성에 대한 의견들이 지속적으로 제안되고 있다. 하지만, 명확한 근거 없이 기준이 강화될 경우 국내 하수처리장에 혼란을 야기할 것이 자명하다. 본 연구에서는 장기 배양법을 기반으로 용량 및 산업단지 연계 처리에 따른 국내 하수의 질소 성상을 분석하였다. 분석 결과, 하수처리장에서 처리되기 어려운 질소 성분인 NBDDON는 1.0 ~ 1.9 mg/L 범위를 보였으며, 하수처리장 용량이 적을수록 DON 농도 & NBDDON/DON가 증가하였다. 또한 도시하수를 처리하는 하수처리장보다 산업단지 하수처리장의 NBDDON/DON 비가 높은 것으로 조사되었다. 본 연구의 결과는 향 후 국내 하수처리장 방류수 수질 기준 개선을 위한 중요한 기초 자료로 활용될 것이라 전망한다.
Abstract
Recently, opinions on the need for revision regarding the nitrogen effluent standard of nitrogen from sewage treatment plant(STP) are consistently suggested. However, it is axiomatic that if nitrogen effluent standard is strengthened without a clear basis, it will cause confusion in domestic STP. In this research, nitrogen fraction was analyzed based on a long-term incubation method, according to STP capacity, and the linked treatment of industrial wastewater. As a result, NBDDON, which is difficult to treat in STP, ranged from 1.0 to 1.9 mg/L. larger DON and NBDDON/DON was detected in small STP (under 10,000 m 3 /d) as opposed to the large STP. NBDDON/DON in industrial STP was about 0.7 and it was higher than municipal STP. This research result will be used in the important raw data for revision of nitrogen effluent standard of nitrogen from STP.
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