| Title |
Effect of Coagulant addition on Nutrient Removal Efficiency in a Submerged Membrane Bioreactor |
| Keywords |
Alum; Hollow fiber; Membrane bioreactor; Nutrient removal |
| Abstract |
This study was performed to investigate the characteristics of nutrient removal of municipal wastewater in the submerged membrane bioreactor by addition of alum directly into aerobic tank. Membrane bioreactor consists of three reactors such as two intermittent anaerobic tanks and the aerobic tank with hollow fiber membrane. The removal efficiencies of CODCcr, BOD, SS, TN and TP on the membrane bioreactor were 94.0%, 99.1%, 99.9%, 66.9%, and 58.9%, respectively. In addition, The removal efficiencies of CODcr, BOD, SS, TN and TP on the membrane bioreactor with alum addition were 93.4%, 99.0%, 99.9%, 63.2%, and 96.8%, respectively. There was little difference between them on the nutrient removal efficiencies except phophorus removal. The estimated sludge production, specific denitrification rate, specific nitrification rate and phosphorus removal content on the membrane bioreactor were 1.76 kgTSS/d, 0.055 mgNO3-N/mgVSS·d, 0.031 mgNH4-N/mgVSS·d, and 0.095 kgP/d, respectively. And The estimated sludge production, specific denitrification rate, specific nitrification rate and phosphorus removal content on the membrane bioreactor with alum addition were 2.90 kgTSS/d, 0.049 mgNO3-N/mgVSS·d, 0.030 mgNH4-N/mgVSS·d, and 0.160 kgP/d, respectively. The alum content added was 1.7 molAl/molP on an average. The increasing ratio of tran-membrane pressure on the membrane bioreactor was 0.0056 kgf/cm2·compared to 0.0033 kgf/cm2·d on the membrane bioreactor with alum addition. There was a slightly reduction effect on membrane fouling by alum addition. |