Project Title: High-Rate Treatment of Spent Filter Backwash Water

摘要

This paper discusses the first phases of an AwwaRF project on evaluation and development of high-rate SFBW treatment processes. The project objective is to provide utilities with the information required to implement high-rate SFBW treatment devices to achieve an overall lower cost and footprint requirement. The research initiated in October 2005 evaluates existing data, complemented by collection and evaluation of new data from bench-, pilot-, and full-scale studies. The existing data includes data published in the literature and unpublished data from drinking water utilities and equipment manufacturers. This research focuses on published and unpublished data, plus new data generated during this research, for high-rate SFBW treatment processes. Several manufacturers provided pilot and full-scale data on high-rate processes that have been evaluated. The proposed project also includes an evaluation of existing innovative full-scale processes through on-site testing and performance evaluation. The pilot phase of the project will take place at two cities that represent very different SFBW qualities -- Cleveland, OH and Central Utah Water Conservancy District (CUWCD). The SFBW quality of these two cities is representative of the range of conditions identified in previous research (e.g., Cornwell et al. 2001). The pilot equipment to be tested has been selected, to target only those processes for which sufficient data does not already exist. The final report will be geared to the development of the Implementation Section that will include a discussion of process performance, SFBW quality applicability, design parameters, operations issues, need for site specific pilots, and cost. The report will also include two example preliminary design reports. The hardcopy report will be complemented by a web-based decision support tool that AwwaRF subscribers can use to interactively review and evaluate treatment options targeted for their particular site-specific conditions. The participating manufactures in this project are U.S. Filter, Leopold, Kruger (Actiflo), Infilco-Degremont (IDI), Koch, and WesTech. Manufacturers will provide existing pilot/fullscale data, pilot facilities, and layout/footprint/cost data. Participating utilities providing in-kind support include Cleveland; CUWCD; South Central Connecticut Regional Water Authority in New Haven; Carmichael, CA; and Passaic Valley Water Commission in New Jersey.