The biological nutrient-removal potential of an on-site Membrane bioreactor (MBR) located
in the basement of a four-person house treating domestic wastewater was investigated.
The reactor consists of two tanks in series. This treatment plant differs from other
conventional MBRs by a highly fluctuating influent water flow and a lack of pretreatment.
During the first period, the first reactor was operated as a primary clarifier, resulting in
nitrogen and phosphorus removals of 50% and 25%, respectively. Primary sludge
production and bad odors in the basement were further disadvantages. When using the
first reactor as an anaerobic/anoxic reactor by recycling activated sludge and mixing the
first reactor, nitrogen and phosphorus removals of over 90% and 70% were achieved,
respectively. By applying a dynamic model of the plant, the return sludge ratio was
identified as the most important parameter.With a return sludge ratio of about 1.2, optimal
PAO growth and phosphorous removal up to 90% was reached. Since only activated sludge
is produced with this operational mode, on-site sludge dewatering is possible. During
vacation periods without loading, the Bio-P activity is kept constant if the aeration is
reduced to 5–20 min d1.
 
The biological nutrient-removal potential of an on-site Membrane bioreactor (MBR) locatedin the basement of a four-person house treating domestic wastewater was investigated.The reactor consists of two tanks in series. This treatment plant differs from otherconventional MBRs by a highly fluctuating influent water flow and a lack of pretreatment.During the first period, the first reactor was operated as a primary clarifier, resulting innitrogen and phosphorus removals of 50% and 25%, respectively. Primary sludgeproduction and bad odors in the basement were further disadvantages. When using thefirst reactor as an anaerobic/anoxic reactor by recycling activated sludge and mixing thefirst reactor, nitrogen and phosphorus removals of over 90% and 70% were achieved,respectively. By applying a dynamic model of the plant, the return sludge ratio wasidentified as the most important parameter.With a return sludge ratio of about 1.2, optimalPAO growth and phosphorous removal up to 90% was reached. Since only activated sludgeis produced with this operational mode, on-site sludge dewatering is possible. Duringvacation periods without loading, the Bio-P activity is kept constant if the aeration isreduced to 5–20 min d1.
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