하수와 초단파 조사된 잉여슬러지의 병합처리가 A2/O 공정의 잉여슬러지 발생량에 미치는 영향 (Effects of the Co-treatment to Municipal Wastewater with Microwave-Irradiated Excess Sludge via an A2/O Process and Its’s Impact on the Excess Sludge Production)

서지정보

· 발행기관 : 한국폐기물자원순환학회
· 수록지 정보 : 한국폐기물자원순환학회지 / 40권 / 4호 / 391 ~ 399페이지
· 저자명 : 범봉수

초록

Organic wastewater, enriched with nutrients such as nitrogen and/or phosphorus, is commonly treated utilizing an A2/ O process. However, technological and cost barriers pose challenges for the extra processing of excess sludge. This study aims to analyze the effects of employing a co-treatment of microwave-irradiated (MWI) excess sludge with wastewater via an A2/O process on subsequent excess sludge production. A comparative experiment was performed, wherein two reactors implementing the A2/O process were deployed. The process included anaerobic (An), anoxic (Ao), aeration (Ox), and settling tanks, along with an internal recycle rate of 2Q, and a sludge return rate of 1Q. Initially, primary effluent and returned sludge from the S Sewage Treatment Plant were utilized. The reactors' hydraulic retention time (HRT) was gradually decreased from 10 hr to 4 hr. All excess sludge was wasted in one reactor (R-C), operating as a control. In contrast, in the other reactor (R-M), 250 mL of excess sludge was microwave-irradiated for 3 minutes and then channeled to an anaerobic tank with primary effluent. Results indicated that the Reagent-Volume to Microorganism-Weight (F/M) ratio in R-M was slightly higher than in R-C. Excess sludge production in R-M was 34% less than in R-C, corresponding to the average microbial growth coefficients for R-C and R-M were 0.352 mg SS/mg CODrem. and 0.234 mg SS/mg CODrem, respectively. Although l influent concentrations of Chemical Oxygen Demand (COD), Total Nitrogen (T-N), and Total Phosphorus (T-P) were higher for R-M, their removal efficiencies proved superior. However, a shortened HRT of 4 hr resulted in a drop in treatment efficiencies across all reactors.

영어초록

Organic wastewater, enriched with nutrients such as nitrogen and/or phosphorus, is commonly treated utilizing an A2/ O process. However, technological and cost barriers pose challenges for the extra processing of excess sludge. This study aims to analyze the effects of employing a co-treatment of microwave-irradiated (MWI) excess sludge with wastewater via an A2/O process on subsequent excess sludge production. A comparative experiment was performed, wherein two reactors implementing the A2/O process were deployed. The process included anaerobic (An), anoxic (Ao), aeration (Ox), and settling tanks, along with an internal recycle rate of 2Q, and a sludge return rate of 1Q. Initially, primary effluent and returned sludge from the S Sewage Treatment Plant were utilized. The reactors' hydraulic retention time (HRT) was gradually decreased from 10 hr to 4 hr. All excess sludge was wasted in one reactor (R-C), operating as a control. In contrast, in the other reactor (R-M), 250 mL of excess sludge was microwave-irradiated for 3 minutes and then channeled to an anaerobic tank with primary effluent. Results indicated that the Reagent-Volume to Microorganism-Weight (F/M) ratio in R-M was slightly higher than in R-C. Excess sludge production in R-M was 34% less than in R-C, corresponding to the average microbial growth coefficients for R-C and R-M were 0.352 mg SS/mg CODrem. and 0.234 mg SS/mg CODrem, respectively. Although l influent concentrations of Chemical Oxygen Demand (COD), Total Nitrogen (T-N), and Total Phosphorus (T-P) were higher for R-M, their removal efficiencies proved superior. However, a shortened HRT of 4 hr resulted in a drop in treatment efficiencies across all reactors.

참고자료

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