The intended use of the data collected under the ICR is to provide a sound basis for modifying regulations related to the disinfection process and the formation of disinfection byproducts. Three modifications are expected to take place when the regulatory negotiation team reconvenes in 1998 to formulate Stage 2 of the D/DBP Rule and the Enhanced Surface Water Treatment Rule (ESWTR). The proposed Stage 1, D/DBP Rule modifies the existing maximum contaminant level (MCL) for trihalomethanes (THMs) and sets a new MCL for the sum of five haloacetic acid (HAA5) species concentrations. The proposed rule also suggests some measures of control for DBP precursor material, such as natural organic matter (NOM), as it was recognized that precursor control will help minimize the formation of known and unknown DBPs. The control measure suggested for precursor removal is formulated as the enhanced coagulation requirements. As an alternative, utilities will also be allowed to use adsorption on granular activated carbon (GAC) for the control of DBP precursors. Monitoring and study requirements for the ICR includes extensive analytical work covering a wide range of chemical and microbiological parameters. Many utilities will have to spend a substantial amount of money to carry out the requirements of the ICR. In addition, compliance with enhanced coagulation requirements of the D/DBP Rule may also translate to significant investments in capital and operational budget. This paper presents a discussion of the basic requirements of enhanced coagulation and ICR, followed by a discussion of the implementation plan by the City of Tempe, Arizona.
| File Size : | 1
file |
| ISBN(s) : | 089867834X |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 01/01/1995 |
