WANG Jin-long.Discussion and Improvement on Design of UF and RO Process in a Water Reclamation Plant[J].China Water & Wastewater,2020,36(24 24):120-125.
Discussion and Improvement on Design of UF and RO Process in a Water Reclamation Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
24 24
Page:
120-125
Column:
Date of publication:
2020-12-17
- Keywords:
- water reclamation; UF; RO; backwashing; membrane flux
- Abstract:
- A water reclamation plant uses the ultrafiltration (UF) and reverse osmosis(RO) membrane process to treat the effluent of a sewage plant, and can only reach 80% of the designed treatment capacity in winter. Through the comparative study of design parameters and operation parameters, it was found that the designed membrane flux value of UF and RO was too large, resulting in insufficient winter water production. At the same time, since the effluent characteristics of the sewage plant such as complex components and many bacteria are not fully considered, the pretreatment and protection technology of UF is not designed. Since the UF cleaning backwash cycle is high and the RO sterilization frequency is low, the system water consumption is increased. Besides, there’s insufficient system design reservation and no standby membrane set for RO offline cleaning and equipment maintenance. In the following reconstruction, multi-media filters before UF are added to strengthen the UF pretreatment. At the same time, the sodium hypochlorite injection points of the high-efficiency tank outlet and the UF production tank are added to strengthen the bacteria control of the RO system. Two groups of UF systems and 1 group of RO system are added to ensure that the system can reach full load operation. It is recommended that similar projects should be piloted in winter, using the membrane flux at the most unfavorable water temperature, and the loss of self-consumption water should be fully considered. At the same time, recommended values in Code for Design of Municipal Wastewater Reclamation and Reuse (GB 50335-2016) should be referred.
Last Update:
2020-12-17