응집교반조와 경사판 침전지를 적용한 하수처리장 전처리 시설에 관한 연구 = A Study on the Pre-treatment Installation of Sewer Plant of Inclined Settler and Coagulation Agitator

다국어 초록 (Multilingual Abstract)

This study has been performed to deliver the decrease the loads of pollutant and to develop a supplementary process to secure the stable water quality by the Lab-scaled pilot plant in which is to evaluate the treatment efficiency. As the results from Jar-test of the following 10 kinds of mixed coagulants; Al₂(SO)₄, Ca₂O₄, Na₂CO₃, zeolite, cement, and cation. The treatment efficiency has been increased by containing cations and Zeolite. An analysis on the treatment efficiency regarding each level of input concentrations has been taken place by the injections of mixed coagulants to the process. It was intended to find optimal compositions to get the best treatment efficiency. The experiments are performed by classifying into the following cases; (Ⅰ) mixed coagulants are not injected, (Ⅱ) coagulants are injected by 10mg/L, 50mg/L, 100mg/L, and 200mg/L, respectively. In case of no injection of mixed coagulants and injection of 10㎎/L, flocs have been formed. In case of 50mg/L and 100mg/L, flocs have been remarkably formed in coagulation reactor and substantially made well settlements in inclined sedimentation plates. In case of 200mg/L, it has been analyzed to show the best treatment efficiency. In case of excessive injection of mixed coagulants, coagulation and precipitation have occurred at the sameime in coagulation reactor. The pre-treatment process in this research made stable water quality possible, and it has been analyzed that this would be able to decrease the shock impact loads causing by the inflow of sewage water or non-point pollutants with high concentrations. However, in case of the treatment of large amount of organic matters, extensive carbon sources are required to remove nutrients such as nitrogen and phosphorus. Researches for the influencing factors of carbon sources on the removal of nitrogen and phosphorus would be more required for the future study.

목차 (Table of Contents)

• Ⅰ. 서론 1
• 1.1 연구 배경 1
• 1.2 연구 목적 및 범위 3
• Ⅱ. 이론적 고찰 4
• 2.1 응집 4
• 2.1.1 응집의 메커니즘 4
• (1) 콜로이드의 특성 5
• (2) 제타전위 7
• 2.1.2 응집제의 종류 및 특성 8
• (1) 응집제 8
• ① 황산 알루미늄(Aluminium Sulfate, Al₂(SO₄)₃) 8
• ② 황산 제1철(Ferrous sulfate, FeSO₄) 9
• ③ 염화 제2철(Ferric chloride, FeCl₃·6H₂0) 10
• ④ 황산 제2철(Ferric sulfate, Fe(SO₄)₃) 11
• ⑤ 폴리염화알루미늄(PAC) 11
• ⑥ 폴리수산화염화규산알루미늄(PACS) 12
• (2) 응집보조제 13
• 2.2 고속 응집 침전 시설의 종류 및 특성 15
• 2.2.1 URC 15
• 2.2.2 ACTIFLO 17
• Ⅲ. 장치의 개요 19
• 3.1 장치의 개요 19
• 3.2 장치의 구성 19
• Ⅳ. 실험 방법 24
• 4.1 Jar-test 24
• 4.1.1 최적 응집제 선정 24
• (1) 응집제의 구성 24
• (2) 응집제 선정 결과 26
• 4.2 경사판 침전지의 처리효율 32
• 4.2.1 경사판 침전지의 처리효율 비교 32
• 4.2.2 실험 결과 32
• 4.3 주입량에 따른 처리효율 변화 34
• 4.3.1 주입량 선정 34
• 4.3.2 실험 결과 35
• (1) 혼합응집제 주입량에 따른 처리효율 분석 35
• ① 혼합응집제를 주입하지 않았을 경우 처리효율 35
• ② 혼합응집제 10 ㎎/L 주입시 처리효율 38
• ③ 혼합응집제 50 ㎎/L 주입시 처리효율 41
• ④ 혼합응집제 100 ㎎/L 주입시 처리효율 44
• ⑤ 혼합응집제 200 ㎎/L 주입시 처리효율 47
• (2) 혼합응집제 농도별 평균처리효율 50
• ① SS의 평균처리효율 50
• ② BOD_(5)의 평균처리효율 52
• ③ CODcr의 평균처리효율 53
• ④ T-N의 평균처리효율 55
• ⑤ T-P의 평균처리효율 56
• Ⅶ. 결론 58
• 참고문헌 61
• ABSTRACT 62