This PowerPoint presentation explores microfiltration, ultrafiltration and reverse osmosis membrane technology troubleshooting including preventative maintenance and corrective efforts....

This paper documents an economic analysis that was performed to determine the most effective cleaning interval for the RO membrane in the OCWD GWR System. This system consists of 15 individual 5 million gallon per day rated RO units. The purpose of the analysis was to determine the optimum interval of operation between CIP cleanings in a year, bas...

This paper presents the results of various RO membranes that have been tested at West Basin in 5,000 hour qualifications trials. The fouling nature of the sourcewater results in a marked difference In performance of diffent RO membranes. The protocol that was used to identify the membranes that would perform better on this water source is present...

This presentaiton will provide an overview of the types of fouling that affect spiral wound membranes. Details of fouling and scaling are investigated as well as how to develop appropriate cleaning criteria. Chemicals used to clean membranes and safety considerations are coverd as well....

This PowerPoint presentation describes MF/UF systems and how engineers can consider different approaches for retrofits....

Constructed in 1995, West Basin's Edward C. Little Water Recycling Facility (ECLWRF) treats municipal secondary effluent from the City of Los Angeles' Hyperion Wastewater Treatment Plant for a variety of reuse applications. West Basin has expanded the ECLWRF four times since startup, and has also added three satellites treatment facilities, which a...

The purpose of this paper is to document the performance and integrity issues experienced at this facility and present a preliminary cost comparison to either repair or replace the Memcor 90M10C micro filtration (MF) units at the West Basin ExxonMobil Water Recycling Facility. Three options were evaluated; 1) continue repairing the existing MF sys...

This paper compares and contrasts the designs of at least six separate brackish groundwater desalters in Southern California for key parameters such as flux, recovery, brine concentrations and disposal methods, permeate treatment goals, and stabilization methods and requirements. Additionally, the paper discusses operational and performance issues...

This paper is a case study of the Irvine Ranch Water District (IRWD) in Orange County, California that provides potable water (local groundwater and imported), wastewater treatment for the production of recycled water, and natural treatment system to clean urban runoff. IRWD has several membrane treatment facilities that include the Deep Aquifer T...

This paper describes the Mesa Water Reliability Facility?s treatment system, which includes nanofiltration (NF). Operational challenges included: inconsistent results between silt density index (SDI) filter pad technologies; membrane fouling characteristics and challenges; membrane cleaning improvements and optimization; and flux and recovery setp...

This presentation will discuss West Basin Municipal Water District as a case study for innovative uses of recycled water. In its 20th year of water recycling with membrane technologies, West Basin has cultivated an approach to providing its customers with fit-for-purpose designer water qualities. The discussion will include how West Basin treats se...

his presentation will discuss the lessons learned by West Basin from 20 years of membrane application, discuss West Basin?s current effort to catch up and implement several industry standards, and share how West Basin plans for its future water reliability and expansion. Specifically, the presentation will review West Basin?s past designs, construc...

This paper will discuss the lessons learned by West Basin from 20 years of membrane application, discuss the current effort to catch up and implement several industry standards, and share how they plan for its future reliability and expansion....

The West Basin Municipal Water District?s Edward C. Little Water Recycling Facility (ECLWRF) located in El Segundo, CA is a world class facility that produces four qualities of recycled water for municipal, commercial and industrial applications including water supply to injection wells that are part of West Coast Barrier System. The source of recy...

This testing will characterize RO elements for fouling performance and TOC rejection while treating ozonated secondary effluent. This paper will document the results of this testing, offering an important body of data that will be of use in the selection of RO membranes for all potable reuse projects considering the use of ozone as pretreatment to ...