20世纪70年代初，位于纽约州中部的大都会水务局（MWB）面临着一个挑战，即寻找一种经济的方法来扩大其安大略湖工厂的处理和输送能力，并以符合其污染物排放许可证要求的方式处理处理处理过程中的废物。经过广泛的测试，通过实施高速直接过滤，处理厂的处理能力翻了一番，这也减少了该厂产生的明矾污泥量。中试和全面测试导致了永久性污泥处理设施的建设。该系统包括用于固体分离、初始固结和储存的改良保留泻湖。 浮式泵通过管道将污泥输送至一系列床层，在那里冷冻、解冻和倾析浓缩污泥，使其适合土地应用。包括数字。

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.