AWWA JAW20093 Journal AWWA - Implementing Direct Filtration and Natural Freezing of Alum Sludge

Journal Article by American Water Works Association, 12/01/1986

Fitch, David E.;Elliott, C. Michael

Full Description

In the early 1970s, the Metropolitan Water Board (MWB), located in central New York State, was faced with the challenge of finding an economical method of expanding the treatment and transmission capacities of its Lake Ontario plant and treating the treatment process waste in such a way that the requirements of its pollutant discharge permit were met. After extensive testing, doubling of treatment plant capacity was accomplished by implementing high-rate direct filtration, which also reduced the amount of alum sludge generated by the plant. Pilot- and full-scale testing led to the construction of permanent sludge handling facilities. This system incorporates modified retention lagoons for solids separation, initial consolidation, and storage. A floating pump transfers the sludge via a pipeline to a series of beds, where freezing, thawing, and decanting concentrate the sludge, making it suitable for land application. Includes figures.

Product Details

Edition: Vol. 78 - No. 12 Published: 12/01/1986 Number of Pages: 5 File Size: 1 file , 2 MB