【摘要】 生物池经过一段时间运行后需要卸空维修水下设备,这对MBR工艺的运行造成一定的冲击。结合北京某再生水厂的运行实践,提出了应对生物池卸空的水质调控和膜池运行措施。对于分体式MBR工艺,为防止卸空造成邻池的膜厌氧板结,应改进生物池到膜池的配水渠道设计。同时,通过提前预排泥和调整工艺参数,确保卸空期间的出水水质达标。针对生物池卸空可能导致的膜池污泥浓度过高,可将卸空的生物池混合液排入厂区污水系统泵前池。此外,在卸空生物池时速度不宜过快,并通过增加膜的擦洗气量来减轻膜污染,必要时可采取在线和离线化学清洗,以恢复膜通量。更多还原

【Abstract】 After a period of operation,the biological tank needs to be emptied for the maintenance of underwater equipment,which will have a certain impact on the operation of the MBR process. Based on the practice of a reclaimed water plant in Beijing,the water quality control and MBR tank operation measures were proposed to cope with the impact of biological tank emptying. For the separate-type MBR process,in order to prevent the hardening of membrane caused by the emptying in the adjacent tank,the design of the distribution pipeline between the biological tank and membrane tank should be improved. At the same time,measures such as pre-draining and adjusting process parameters should be taken to ensure the effluent quality during the emptying period. Regarding the problem of the possible higher sludge concentration in membrane tank caused by emptying biological tank,the mixed liquid in the biological tank might be discharged into the sump of inlet pumping station. In addition,the speed should not be too fast when emptying the biological tank,and the air flow for cleaning membrane was increased to reduce membrane fouling; if necessary,on-line and off-line chemical cleaning could be adopted to recover the membrane flux.更多还原