AWWA SOURCES59193

The full-scale operation of water reuse facilities, and delivery of recycled water to farms,by the Monterey Regional Water Pollution Control Agency began in April 1998. Dependingon demand for the reclaimed municipal wastewater, up to 90,000 m³/day (24 million gal/d)can be treated and distributed to farmers to irrigate 5,000 hectares (12,000 acres) of foodcrops, including artichokes, lettuce, broccoli, and strawberries. The treatment train consistsof primary sedimentation, biological secondary treatment (trickling filter/solids contact),coagulation, flocculation, dual-media filtration, and chlorine disinfection. Since 1988, thetertiary effluent has been monitored daily for total and fecal coliform bacteria andapproximately three times per year for pathogenic organisms of concern, including totalculturable virus, E. Coli 0157:H7, Legionella, Salmonella, Shigella, Cyclospora oocysts,Giardia cysts, Cryptosporidium oocysts, and helminth eggs. During five years of monitoring,the California Title 22 standard on total coliforms has been exceeded only five times. In termsof pathogens, only Cryptosporidium oocysts, Giardia cysts, and Cyclospora oocysts havebeen found in the final effluent. Cryptosporidium oocysts were detected in 39% and Giardiacysts and Cyclospora oocysts in 6% of the effluent samples, with maximum concentrations of2.3, 0.3, and 0.034 cysts/L, respectively. These low concentrations are not believed torepresent a health risk. Includes 16 references, tables.

Product Details

Edition:

Vol. - No.

Published:

01/11/2004

Number of Pages:

10

File Size:

1 file , 390 KB