Author(s)

Rongyang Qian

Corresponding Author

Rongyang Qian

Abstract

A new type of anti pollution ultrafiltration membrane based on graphene oxide (GO) doped polyvinylidene fluoride (PVDF) was developed to address the problems of poor anti pollution, high energy consumption, and low resource recovery efficiency of traditional membrane technology in the deep treatment and recycling of urban sewage. A coupled process of "anaerobic/aerobic (A/O) - membrane bioreactor (MBR) - nanofiltration (NF)" was constructed to achieve efficient sewage purification and synchronous recovery of nitrogen and phosphorus resources. he results showed that the hydrophilicity and flux of GO-PVDF membrane were significantly improved, the stable flux reached 195 L/(m²·h), and the flux recovery rate after pollution reached 94.2%, which was about 15% higher than that of the original membrane. The removal rates of COD, NH-N, TP and turbidity by the integrated process exceeded 88%, 93%, 95% and 98% respectively, and the effluent quality met the standard of reuse of urban recycling water-water quality standard for industrial uses (GB/T 19923-2005). Nitrogen and phosphorus were recovered from the concentrated water side of NF by struvite crystallization, and the product purity was high. After introducing the energy recovery device, the net energy consumption of the system is reduced by 43% compared with the traditional process. This study provides technical support for low-carbon and high-efficiency regeneration and resource utilization of urban sewage.

Keywords

New membrane separation technology, advanced treatment, recycling, municipal sewage, graphene oxide, doped polyvinylidene fluoride