울산하수처리장의 화학적인 수질개선

Abstract

본 연구의 목적은 1차 처리를 하는 울산하수처리장을 화학적 응집제의 첨가로 수질을 개선하는 것이었다. 설계당시의 BOD, COD 및 SS의 제거효율은 40 ∼ 60%이었으나 현재의 제거효율은 30∼40% 이다. 그러나 설계당시 고려되지 않았던 총질소와 총인의 제거율은 각각 30%, 3%이었다.

소량의 응집제 Hi-PAX(Poly Aluminum Chloride Silicate)를 펌프동 유입부에 주입하여 모든 항목에서 오염물의 제거율이 향상되었다. 또한 총질소의 제거효율은 3%에서 30%로 총인의 제거효율은 30%에서 90%로 증가하였다.

종합적인 오염인자인 OCP(Oxygen Consumption Potential)는 기존 1차 침전공정은 전체 오염물의 15%정도만 제거할 수 있으며 생물학적 처리는 39%, 그리고 화학적 처리는 50%내외로 처리되는 것으로 나타났다. OCP 1kg 를 처리하는데 소요되는 단위처리비용은 기존 1차 처리 공정의 33%, 1차처리후 생물학적 처리할 경우의 75% 수준이었다.

The objective of this study was to upgrade the efficiencies of Ulsan primary municipal wastewater treatment plant by chemical application. The present removal efficiencies of BOD, COD and SS were in the range of 30 ∼ 40% while the design target were 40∼60%. But the removal of total nitrogen and phosphorous, which components were not considered at the time of design, were 30 % and 3 %, respectively.

The simple application of small amount of Hi-PaX(Poly Aluminum Chloride Silicate) to the inlet of screw pump shows enhanced removal efficiencies in all contaminants. The removal of SS increased to 80 ∼ 90% while BOD and COD to 70% and 55%, respectively. In addition, the removal of total nitrogen and phosphorous removal also increased from 3% and 25% to 30% and 90%, respectively.

The removal of integrated pollution parameter OCP(Oxygen Consumption Potential) in present primary treatment was 15%, 39% in biological treatment after primary treatment and about 50% in chemical treatment. the unit cost of OCP removal in chemical treatment was 33% of that of present primary process, 75% of that of biological treatment after present process.

The objective of this study was to upgrade the efficiencies of Ulsan primary municipal wastewater treatment plant by chemical application. The present removal efficiencies of BOD, COD and SS were in the range of 30 ∼ 40% while the design target were 40∼60%. But the removal of total nitrogen and phosphorous, which components were not considered at the time of design, were 30 % and 3 %, respectively.

The simple application of small amount of Hi-PaX(Poly Aluminum Chloride Silicate) to the inlet of screw pump shows enhanced removal efficiencies in all contaminants. The removal of SS increased to 80 ∼ 90% while BOD and COD to 70% and 55%, respectively. In addition, the removal of total nitrogen and phosphorous removal also increased from 3% and 25% to 30% and 90%, respectively.

The removal of integrated pollution parameter OCP(Oxygen Consumption Potential) in present primary treatment was 15%, 39% in biological treatment after primary treatment and about 50% in chemical treatment. the unit cost of OCP removal in chemical treatment was 33% of that of present primary process, 75% of that of biological treatment after present process.