AWWA ACE56246

Burgeoning population growth, scarcity of new freshwater sources, and aninflux of proposals to use reclaimed water to augment potable supplies have putincreasing pressure on the State of California to develop comprehensive criteria forindirect potable reuse via groundwater recharge. While the California Department ofHealth Services (DHS) began the process of developing criteria for both surfacespreading and injection projects several years ago, DHS has intensified its efforts inthe last year. The most recent draft criteria, released in 2001, include requirementsthat reflect current concerns over nitrogen compounds, unregulated emergingchemical contaminants such as endocrine disruptors and pharmaceuticals, and totalorganic carbon (TOC) limits. Disinfected filtered reclaimed water is the minimumallowed for surface spreading projects, although additional treatment may benecessary if soil aquifer treatment is ineffective. Additional treatment via reverseosmosis is required for all injection projects to insure organics removal. DHS is nowconsidering requirements to allow recharge of 50 to 100 percent reclaimed water withcontrols that may include testing for tentatively identified compounds, advancedoxidation using ultraviolet radiation and hydrogen peroxide, in vivo toxicity testing,and lowering the TOC limit to 0.5 mg/L. The criteria will continue to evolve toaddress new issues or concerns as they arise. Includes table, figures.

Product Details

Edition:

Vol. - No.

Published:

06/16/2002

Number of Pages:

11

File Size:

1 file , 540 KB