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1. |
Sump Pump Makes Fast Work of Slow Sludge |
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Opflow,
Volume 18,
Issue 5,
1992,
Page 1-5
Thomas B. Howard,
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PDF (1559KB)
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摘要:
The city of Poway (Calif.) Water Treatment Plant has two sedimentation basins for settling out materials by gravity. After these incoming solids settle out in the basins, a traveling bridge, which runs the length of the tanks, then pumps the sludge from the bottom of the basin. The sludge is pumped to the sludge‐basin holding tank where it is prepared for pumping into the sewer system. The low pumping rates from the 38,500‐gal (145,722‐L) sludge basin to the sewer system created problems in the treatment system. The existing system included a 2‐in. (50‐mm) diameter discharge line that made it difficult to use a pump with sufficient capacity to empty the basin in a reasonable amount of time. The problem was corrected in 1990 when the decant pump was replaced with a 120‐gpm (454‐L/min) sump pump.
ISSN:0149-8029
DOI:10.1002/j.1551-8701.1992.tb00290.x
出版商:Wiley
年代:1992
数据来源: WILEY
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2. |
Streaming Current Monitor Controls Coagulant Addition |
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Opflow,
Volume 18,
Issue 5,
1992,
Page 3-7
Timothy D. Peterson,
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PDF (2165KB)
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摘要:
Proper coagulation is one of the most critical processes used in water treatment. The efficiency of the entire treatment process is determined within the first few seconds after the coagulant is added. The article discusses how coagulation works and how it affects filters, then goes on to describe a case study of the Marinette Water Utility. The case study explains the problems the utility experienced with coagulation and how the utility solved its problems by installing a streaming current monitor to control coagulant feed and a sludge pump system to empty sludge basins. A technical drawing of the sludge pumping system, which saves the utility $20,000 per year, is included. A sidebar explains how streaming current monitors work.
ISSN:0149-8029
DOI:10.1002/j.1551-8701.1992.tb00288.x
出版商:Wiley
年代:1992
数据来源: WILEY
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3. |
Hydrant Colors Help Firefighters Identify Flow Capacity |
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Opflow,
Volume 18,
Issue 5,
1992,
Page 7-7
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PDF (713KB)
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摘要:
This article suggests a scheme painting hydrants various colors to indicate the flow capacity of the hydrant. The color scheme duplicates in its essentials similar schemes adopted by the Maine Utilities Association, the New England Water Works Association, and the National Fire Protection Association.
ISSN:0149-8029
DOI:10.1002/j.1551-8701.1992.tb00289.x
出版商:Wiley
年代:1992
数据来源: WILEY
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