新建城市污水处理厂或提标改造老旧污水处理厂普遍存在出水水质差、污染物负荷与占地面积等不可调和的矛盾，基于纵向扩大池容会增加建设成本、高负荷运行具有超标风险，因此，急需一种污泥/容积负荷高、运行稳定、操作简单的污水处理新技术。对此，某大型市政污水处理厂利用移动床生物膜反应器(MBBR)泥膜共混技术提高生化池有效污泥浓度、实现功能微生物的强化和富集，耦合多段AO工艺，经历雨/旱、夏/冬季，已稳定运行 227 d，当进水CODCr、氨氮、TN质量浓度分别为 277。97、34。92、45。95 mg/L，对应出水质量浓度分别降低至 12。68、0。33、7。55 mg/L，MBBR 挂膜前后的氨氮污泥负荷为0。011、0。015 g 氨氮/(g MLSS·d)、TN污泥负荷为 0。014、0。020 g TN/(g MLSS·d)。系统稳定运行期间，好氧Ⅰ段氨氮硝化速率为7。27 mg/(L·h)、缺氧Ⅰ段NO-3-N还原速率为3。48 mg/(L·h)。结果表明，通过负载微生物和游离污泥的交互作用，寻求复杂微生物群落功能的强化和调控，可以设计出更加合理、高效的污水处理新工艺。
Analysis of Regulation and Operation of MBBR Coupled with Multi-Stage AO Process in Large Municipal WWTP
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.
municipal wastewater treatment plantmoving bed biofilm reactor(MBBR)multi-stage AO processmud film blending technologyenhanced denitrification
国家科技期刊平台
NSTL
万方数据
维普
