AWWA WQTC58997

The purpose of the membrane pilot study for the City of Grand Blanc was to establish thefollowing:evaluate contaminant removal efficiencies (percent), and determine feed water blendingratios to achieve the target effluent water quality goals;evaluate performance of product flux over time, and monitor water quality;measure change in trans-membrane pressure (TMP) over time, TMP being the driving forcebetween the concentrate pressure and permeate pressure;measure reject stream characteristics and evaluate options for discharging the rejectwater (including discharging the reject water to the Genessee County sewer system);evaluate the relative effectiveness of two different membrane materials for arseniccontrol;evaluate the applicability of the existing iron removal plants as a pretreatment step to theproposed membrane plants; and,develop a basis of design for the proposed membrane plants.A skid-mounted membrane pilot plant unit, with a 10 gpm capacity, was utilized for this study.The membrane skid was supplied by Osmonics, Inc. The pilot unit was operated at both Wells5/8 and Well 7 locations. A by-pass from the iron removal plant finished water line was used tofeed the membrane pilot unit. Sodium bisulfite was added to the membrane feed water to quenchthe chlorine residual. An anti-scalant chemical was added to the feed water to prevent the saltsfrom precipitating on the membranes. A conductivity meter was mounted on the permeate waterline.The pilot plant was operated from December 26, 2001 through February 6, 2002. The pilot plantwas operated on a continuous 24-hour per day basis. No major operational problems wereencountered during the pilot study, except for a malfunction of the pressure sensor on thepermeate side. The following operational and water quality parameters were monitored on a daily basis:pre- and post- cartridge filter pressures;membrane influent pressure;permeate and reject flows;percent recovery; and,permeate conductivity, permeate pH, and free chlorine residual.Water samples were collected and analyzed for the following water quality parameters twice aweek or daily at the two locations:hardness;chloride;fluoride;total arsenic; and,total dissolved solids. Includes 2 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/02/2003

Number of Pages:

10

File Size:

1 file , 340 KB