하수처리장의 효율적 응집공정 운영을 위한 응집제(Al계 및 Fe계)별 유기물 제거특성 연구 = A Study on the Removal Characteristics of Organic Matter by Coagulant (Al and Fe) for the Effective Coagulation Process of Sewage Treatment Plant

국문 초록 (Abstract)

본 연구에서는 MLE 공법 + 화학처리하고 있는 하수처리장에서 화학처리시 사용되고 있는 응집공정의 효율적 운영을 도모하고자 Jar-test를 실시하여 응집제별(PAC(10%), Alum(8%), PSO-M (8%) FeCl₃(38%)) 유기물 지표 COD_Mn 및 SS, 항목의 제거 특성을 파악하는데 그 목적이 있다. 본 연구에 사용된 원수의 경우 P시 N하수처리장 폭기조 유출수를 사용하였으며, 선행연구(응집제를 5 mL 단위로 주입)에서 도출된 응집범위를 1 mL 단위로 나누어 실험을 진행하였다. 이때 공통적인 실험조건으로는 급속교반 200 r/min(1 min), 완속교반 60 r/min(15 min) 및 Sedimentation time (30 min)로 실시하였으며, PAC의 경우 (38 ~ 43) mL, Alum의 경우 (48 ~ 53) mL, PSO-M의 경우 (43 ~ 48) mL 및 FeCl₃의 경우 (48 ~ 53) mL 범위로 각각 주입하였다. Jar-test 결과 COD_Mn 제거효율 50.0%, SS 제거효율 95.1%로 FeCl₃ 응집제가 가장 높은 제거효율이 나타났다. 이는 Fe(Ⅲ)계 응집제가 Al(Ⅲ)계 응집제 보다 넓은 pH 범위를 가지고 있어 유기물 제거효율 보다 높게 나타나 하수처리장에서 최적의 응집제는 FeCl₃ 판단된다.

다국어 초록 (Multilingual Abstract)

This study, Jar-test was conducted to investigate the efficient operation of the coagulation process used at the sewage treatment plant. The purpose of this research is to identify the removal characteristics of COD_Mn and SS with different coagulants. The raw water used in this study, the effluent of the aeration basin of the P city N sewage treatment plant was used and the agglomeration range derived from the previous study (coagulant injected in 5 mL increments) was divided into 1 mL units. Coagulation Injection of 38 to 43 mL for PAC(10%), 48 ~ 53 mL for PSO-M(8%), 43 ~ 48 mL for Alum(8%) and 48 ~ 53 mL for FeCl₃(38%), respectively. The common experimental conditions were agitation at 200 rpm (1 min), 60 rpm (15 min) and sedimentation time (30 min). Use for Fecl3 removal efficiency of COD_Mn was 50.0% and the removal efficiency of SS was 95.1%. It was concluded that Fe(Ⅲ) based flocculants have a wider pH range than Al(Ⅲ) based flocculants and higher than organic removal efficiency. Optimum coagulant is FeCl₃ of the non-biodegradable organic matter flows into sewage treatment plant.

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