AWWA JAW39306

The proposed Disinfectants/Disinfection By-Products (D/DBP) Rule includes a requirement that surface water systems using conventional treatment must remove DBP precursors--as measured by total organic carbon (TOC)--in addition to meeting standards for the D/DBPs themselves. TOC removal criteria are based on influent TOC and alkalinity (referred to as step 1); however, systems can demonstrate the need for alternative TOC removal performance criteria based on jar-testing (referred to as step 2). Tests based on various source waters throughout the United States show that some waters will be able to meet step 1 TOC removal criteria and that although step 2 analysis is not required, jar testing can be used to determine means of complying with the DBP precursor removal criteria. In other waters, however, jar tests will be needed to determine a point of diminishing returns (i.e., <0.3 mg/L TOC removal for an incremental dose of 10 mg/L alum) that can be employed in requesting alternative TOC removal performance criteria. Includes 19 references, tables, figures.

Product Details

Edition:

Vol. 87 - No. 10

Published:

10/01/1995

Number of Pages:

15

File Size:

1 file , 9.9 MB