摘要
Abstract
New urban wastewater treatment plants(WWTPs)or upgrading old WWTPs generally have irreconcilable contradictions such as poor effluent quality,pollutant load and occupied area,based on vertical expansion of pool capacity will increase construction costs,high load operation has the risk of exceeding the standard,therefore,there is an urgent need for a new sewage treatment technology with high sludge/volume load,stable operation and simple operation.In this case,a large municipal WWTP used the moving bed biofilm reactor(MBBR)mud membrane blending technology to improve the effective sludge concentration of the biochemical tank,achieve the strengthening and enrichment of functional microorganisms,coupled with the multi-stage AO process,experienced rain/drought,summer/winter,and has been stable for 227 days.When the influent mass concentrations of CODCr,ammonia nitrogen and TN were 277.97,34.92 mg/L and 45.95 mg/L,the corresponding effluent mass concentrations were reduced to 12.68,0.33 mg/L and 7.55 mg/L,respectively.Sludge loads of ammonia nitrogen before and after MBBR film hanging were 0.011 g ammonia nitrogen/(g MLSS·d)and 0.015 g ammonia nitrogen/(g MLSS·d),and TN sludge loads were 0.014 g TN/(g MLSS·d)and 0.020 g TN/(g MLSS·d).During the stable operation of the system,the nitrification rate of ammonia nitrogen in aerobic Ⅰ stage was 7.27 mg/(L·h),and the reduction rate of NO-3-N in anoxic Ⅰ stage was 3.48 mg/(L·h).The results show that through the interaction of loaded microorganisms and free sludge,seeking to strengthen and regulate the function of complex microbial community,a more reasonable and efficient new wastewater treatment process can be designed.关键词
市政污水处理厂/移动床生物膜反应器(MBBR)/多段AO工艺/泥膜共混技术/强化脱氮Key words
municipal wastewater treatment plant/moving bed biofilm reactor(MBBR)/multi-stage AO process/mud film blending technology/enhanced denitrification分类
土木建筑
