饮用水深度处理工程中的膜工艺设计要点

Key Points of Membrane Process Design in Drinking Water Advanced Treatment Project

福州某新水厂深度处理工程土建规模为20×10^(4)m^(3)/d,设备规模10×10^(4)m^(3)/d,其中主要设备均为现状旧水厂搬迁利用。新水厂经升级改造后,在现状常规净水工艺基础上形成了“混凝+沉淀+砂滤+超滤+纳滤+反渗透+氯消毒”的组合工艺。工艺流程中设多处超越管线,可实现灵活调度运行,提高水厂将来应对水源水质及供水水质标准变化的能力,同时可降低运行成本。平面布置中通过叠建、合建等方式,在保证产水规模的同时,可节省用地。浓水排放管线充分利用现状已建设施,以节省工程造价,缩短项目工期。工程建成运行后,组合工艺能有效应对不同水源水质,膜工艺出水电导率去除率基本稳定在99%以上,出水水质达到优质饮用水标准。

The scale of the advanced treatment project of a new waterworks in Fuzhou is 20×10^(4) m^(3)/d,and the scale of the equipment is 10×10^(4) m^(3)/d,among which the main equipment is relocated from the existing old waterworks.After upgrading and reconstruction of the new waterworks,a combined process consisting of coagulation,sedimentation,sand filtration,ultrafiltration,nanofiltration,reverse osmosis and chlorine disinfection is adopted on the basis of the current conventional water purification process.Several transcendental pipes are set in the process flow,which realize flexible scheduling,improve the ability of the waterworks to cope with future source water quality and water quality standard changes,and reduce the operation cost.In the layout design,overlapping construction and co-construction of structures saves footprint area while ensures the scale of water production.The concentrated water discharge pipeline makes full use of the existing facilities to save the project cost and shorten the construction period.After completion and operation of the project,the combined process effectively deals with the water quality of different water sources.The conductivity removal efficiency of the membrane process basically stabilizes above 99%,and the effluent quality meets the standard of high-quality drinking water.