| Abstract |
| Nitrogen removal in wastewater treatment is a matter importantly dealt with on the preservation of water environment. If the activity of microorganism falls down due to the low temperature of water, and moreover as denitrification efficiency falls down rapidly owing to decline of nitrification rate, there remains a task to improve such a kind of problem. The aim of this research is to improve nitrification and denitrification efficiency according to change of water temperature by MASA system(Modified ASA system) applying MAB procedure to reaerobic of Advanced Step Aeration system. Consequently I applied MAB to reaerobic to make the rate of nitrification be elevated. So the aim of this study was focused on the research of the characteristic of winter sewage disposal through the change of water temperature by applying the best condition of MLSS concentration and HRT of ASA system to MASA system. As a result of research of the treatment rate per water quality item of MASA system in low temperature (10.5~14.7°C), SS, BOD, CODCr, T-P, T-N, NH4+-N were processed more efficiently by 10% than existing ASA system, and by dispositing MAB with the percentage of 97.9%, 96.8%, 97.3%, 86.8%, 94.3%, 98.1% separately, they were approved to be more effective for biological nitrogen removal in low temperature than the existing ASA system. |
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| Key Words |
| Modified ASA system, Membrane Attached Biofilm, biological nitrogen removal |
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