AWWA ACE94195

Concerns over pathogen removal and organics control were the principal design considerations for New York City's first water filtration plant. The design of the new 450 mgd facility encompasses an overall strategy to meet today's drinking water standards while providing sufficient flexibility to address changes in standards anticipated over the next ten years. The design of the new facility is based on four years of large scale studies in a 3 mgd demonstration plant. The proposed treatment train integrates ozonation, diatomaceous earth filtration and biological activated carbon contactors in a process that achieves treatment objectives in a manner superior to conventional treatment using granular filters. Unlike conventional treatment that requires adjustment of coagulant feed to avoid filter breakthrough, for all practical purposes DE filtration is a "fail safe" process. Operator error may result in shortened filter runs, not in particle breakthrough. Recycle of recovered DE reduces not only the cost of treatment materials, but also the complications of waste disposal. This paper addresses the comparative results of various water treatment processes, the presentation of design criteria for the full scale plant, and provisions to be included in anticipation of future regulations such as the Enhanced Surface Water Treatment Rule and the Disinfection By-Products Rule.

Product Details

Published:

01/01/1994

ISBN(s):

0898677750

Number of Pages:

27

File Size:

1 file , 960 KB