Discharging water‐treatment‐plant sludge into natural water courses is an unacceptable method of sludge disposal. The physical properties of sludge only add to the problem and increases the expense of tho complex process involved in rendering the sludge handleable. This article examines several methods of sludge dewatering and its ultimate disposal.
This article is part one of a two‐part article on handling water treatment plant sludge. Characteristics of sludge are addressed. Dewatering methods including thickening, spray application, freeze conditioning, chemical conditioning, coagulant recovery, centrifugation, and filtration are discussed. Part two of the article appears in the September 1985 issue of OpFlow.
This article discusses the approach of the Boulder, Colorado, water utility to determine the conditions of its storage facilities and necessary rehabilitation. Inspection, modified refinishing of the corroded existing tank exterior coating, and refinishing of the corroded interior coating of the Devils's Thumb tank are described. When inspection of the Kohler and Maxwell reservoirs indicated that punctured blisters and bulges in the asphalt liners were allowing water to migrate between the liner and the original floor slab, potential alternatives such as rigid liners, flexible liners, or no liners were evaluated. It was decided to postpone new linings since current annual costs associated with leakage and maintaining the existing liner did not justify installing new liners. Instead, regular cleaning and physical inspections will be continued and leakage tests will be conducted annually. Major deterioration of the overflow structure of the Chautauqua reservoir was observed during an inspection, and options for installing a liner were evaluated. Instead of lining the reservoir, maintenance work was determined to be more cost effective.
This article discusses common water treatment plant sludge disposal methods including discharge to a sanitary sewer and landfilling. The advantages and disadvantages of these methods are presented, and laws and regulations pertaining to sludge disposal are addressed. Steps that may be taken to minimize sludge production including reduction of raw water solids, conservation of coagulant, use of alternate coagulants, direct filtration, coagulant aid, and coagulant recovery are discussed. This is part two of a two‐part article on handling water treatment plant sludge. Part one appeared in the August 1985 issue of OpFlow.
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