长滩水务部（LBWD）正在积极寻求将海水淡化作为饮用水的新来源 为其服务区供水。除了测试 各种脱盐膜技术，包括获得专利的双通道 纳滤（NF²）工艺和传统的海水反渗透（LBWD）工艺同样适用 在试运行前，研究其他需要解决的重要问题 全面生产海水淡化装置。LBWD正在寻求一种基于 使用海底下的穿孔支管收集或排出海水 通过海床上的天然介质，或者过滤介质 放置在海底挖掘区域（海底系统）。入口 该系统基于慢速砂滤的概念（<1加仑/分钟ft^2M，（gpm/ft²）， 这将减轻与冲击相关的任何负面影响 由于吸入速度慢而夹带。此外，海水的收集 通过过滤介质也可以提供一些预处理的好处，包括 减少有机物和悬浮固体。包括12个参考文献、表格和图表。

The Long Beach Water Department (LBWD) is aggressively pursuing seawater desalination as a new source of potable water for its service area. In addition to testing out the operational feasibility of various desalting membrane technologies, including the patented two-pass nanofiltration (NF²) process and traditional seawater reverse osmosis, LBWD is also researching other issues which will be important to address prior to commissioning a full-scale production seawater desalination plant. LBWD is pursuing an alternative intake and discharge system, which is based on using perforated laterals placed under the ocean floor to collect or expel the water through either natural media found on the ocean bed, or alternatively, filter media placed into an excavated area on the ocean floor (ocean floor system). The intake system is based on the concept of slow sand filtration (< 1 gallon/min-ft^2M, (gpm/ ft²)), which should mitigate any negative impacts associated with impingement and entrainment due to its slow intake rate. Additionally, the collection of seawater through the filter media may also offer some pretreatment benefits, including reducing organic and suspended solids. Includes 12 references, tables, figures.