阵列平板膜的研制及其在市政污水处理中的应用

DEVELOPMENT AND APPLICATIONS OF ARRAYED FLAT SHEET MEMBRANE FOR MUNICIPAL WASTEWATER TREATMENT

膜生物反应器已成为水资源再生利用的一种重要设备,在加强生化处理效果、稳定水质水量方面具有较强优势,但较高的投资和运行成本却制约其进一步推广应用。研制了一种用于膜生物反应器的新型阵列平板膜,在活性污泥体系中的临界膜通量可达到114~120 L/(m^(2)·h),且通量分布均匀性优于中空纤维膜。实际市政污水工程应用中,在膜通量为16~25 L/(m^(2)·h),辅以定期高强度曝气物理清洗条件下,该阵列平板膜的跨膜压差显著低于同等条件的中空纤维膜,且增长缓慢,出水水质达到GB 18918—2002《城镇污水处理厂污染物排放标准》一级A标准,在保证出水水质的同时,降低了膜生物反应器的运行成本。

Membrane bioreactor has become one of the important water reclamation equipment.It is advantageous in enhanced biochemical treatment performance,steady effluent quality and quantity,etc.,but is impeded for further application by high investment and operational costs.This study developed a novel arrayed flat sheet membrane for membrane bioreactor,which had a critical flux at 114~120 L/(m^(2)·h)with better uniformity than the hollow fiber membrane.The application in municipal wastewater treatment plants revealed that the novel arrayed flat sheet membrane had significantly lower and slower-growing transmembrane pressure than the hollow fiber membrane with flux at 16~25 L/(m^(2)·h)and regular high-intensity aeration.The effluent quality met the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918—2002,I-A).Thus,the novel arrayed flat sheet membrane could guarantee the effluent quality and reduce the operational cost of membrane bioreactor.