WANGJin-long.Upgrading of Capacity and Standards for Sewage Desalination in a Reclaimed Water Treatment Plant after Operation for 7 Years[J].China Water & Wastewater,2024,40(16):126-130.
Upgrading of Capacity and Standards for Sewage Desalination in a Reclaimed Water Treatment Plant after Operation for 7 Years
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第16期
Page:
126-130
Column:
Date of publication:
2024-08-17
- Keywords:
- reclaimed water; desalination; ultrafiltration (UF); reverse osmosis(RO); expansion; membrane replacement
- Abstract:
- A reclaimed water desalination plant with UF-RO membrane process as the core and a short process layout, is designed with a water production capacity of 20 000 m3/d. It uses the effluent of a sewage treatment plant meeting I-A standard as raw water, with effluent conductivity less than 200 μS/cm. It has been in operation for nearly 7 years basically at full capacity. Due to the increase in water consumption of users in the park, the plant needs to expand by 25% and upgrade the standard at the same time. The retrofitting faces problems such as limited land occupation, high requirements for desalination and water supply guarantee rate, membrane aging, and high conductivity of raw water. By replacing the double membrane that has been in use for nearly 7 years, adding two sets of double layer ultrafiltration construction, replacing the original three sets of secondary RO with two sets of primary RO, and introducing high-quality raw water sources, it has achieved an in-situ increase of 25% and effluent conductivity of less than 150 μS/cm. Among them, reverse osmosis uses domestically produced membranes to partially replace imported membranes. It is recommended to try to apply various new products, including domestic membranes in the production process of multiple systems, and verify technical and economic indicators in practice to accumulate data for subsequent membrane replacement and achieve maximum user benefits. In terms of design, for the double membrane process of sewage sources, the short process is feasible, but attention should be paid to the accuracy of design temperature, yield coefficient and raw water quality, and a certain margin should be left in the reverse osmosis design.
Last Update:
2024-08-17