Evaluating Reverse Osmosis Membrane Performance on Secondary Effluent Pretreated by Membrane Microfiltration
膜微滤预处理二级出水反渗透膜性能评价
发布日期:
1993-01-01
Reedy Creek Energy Services(RCES)对膜工艺进行了评估,以处理来自Reedy Creek改良区(RCID)污水处理厂(WWTP)的高级污水处理废水。总体处理目标是证明拟议的处理工艺可以产生满足佛罗里达州环境法规部(FDER)浅层地下水位排放要求(以及最终排放到里德溪)或其他不可饮用用途的成品水。处理后的水必须满足FDER的营养减少要求,表面排放量为1。
平均每年46毫克/升(mg/L)总氮(as N)和0.04毫克/升总磷(as P)。为了达到这些水平,需要进行反渗透(RO)处理。该项目包括以下阶段:废水水质表征、反渗透预处理工艺选择(包括台架试验)和高级水回收工艺的中试。中试是该项目的主要重点,分三个阶段进行:RO预处理工艺优化、RO膜筛选和长期工艺评估。
RO预处理工艺选择、中试阶段预处理工艺优化和RO膜筛选之后,进行了长期的中试工艺评估,以证明处理工艺的可行性,并获得全面设施实施的设计信息。
Reedy Creek Energy Services (RCES) evaluated membrane processes to treat advanced wastewater treatment effluent from the Reedy Creek Improvement District (RCID) Wastewater Treatment Plant (WWTP). The overall treatment objective was to demonstrate that the proposed treatment processes can produce finished water that meets Florida Department of Environmental Regulation (FDER) discharge requirements for the shallow groundwater table (and eventual discharge to Reedy Creek) or for other nonpotable uses. The treated water must satisfy FDER nutrient reduction requirements for surface discharge of 1.46 milligrams per liter (mg/L) total nitrogen (as N) and 0.04 mg/L total phosphorus (as P) on an average annual basis. To meet these levels, reverse osmosis (RO) treatment was required. The program consisted of the following phases: wastewater effluent quality characterization, RO pretreatment process selection (including bench testing), and pilot testing of the advanced water reclamation process. Pilot testing, which was the major focus of the program, was conducted in three phases: RO pretreatment process optimization, RO membrane screening, and long-term process evaluation. RO pretreatment process selection, pilot-phase pretreatment process optimization and RO membrane screening were followed by a long-term, pilot-scale process evaluation to demonstrate the feasibility of the treatment process and to obtain design information for full-scale facility implementation.