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.
运行7年污水源脱盐中水厂的提量提标改造
- Title:
- Upgrading of Capacity and Standards for Sewage Desalination in a Reclaimed Water Treatment Plant after Operation for 7 Years
- Keywords:
- reclaimed water; desalination; ultrafiltration (UF); reverse osmosis(RO); expansion; membrane replacement
- 摘要:
- 某脱盐中水厂以双膜工艺为核心，采用短流程布置方式，设计产水规模2×104 m3/d，以污水处理厂一级A达标出水为原水，产水电导率<200 μS/cm，已运行近7年，基本满负荷运行。由于园区用户用水量增加，该厂需扩容25%，在提量的同时进行提标改造，而改造面临占地受限、脱盐要求和供水保障率要求高、膜老化、原水电导率高等问题。通过将已使用近7年的双膜更换、超滤建设双层增加2组、拆除原3组二级RO增加2组一级RO、引入优质原水水源等综合方式，实现原位提量25%，并实现产水电导率<150 μS/cm。其中，反渗透采用国产膜实现了对进口膜的部分替代。建议多组系统生产过程中尝试包括国产膜在内多种新产品，在实践中检验技术经济指标，为后续换膜积累数据，实现用户效益最大化。在设计方面，对于污水源双膜工艺，短流程具备可行性，但应关注设计温度、产率系数、原水水质取值准确性，反渗透设计应有一定余量。
- 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.
相似文献/References:
[1]王秋晨,姜红,张勇,等.Bardenpho-臭氧催化氧化-双膜法用于再生水厂[J].中国给水排水,2024,40(6):103.
WANGQiu-chen,JIANG Hong,ZHANG Yong,et al.Application of Bardenpho, Ozone Catalytic Oxidation and Dual Membrane (UF & RO) Method in a Reclaimed Water Plant[J].China Water & Wastewater,2024,40(16):103.
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