Waste Management

Biosolids engineering and management by Lawrence K Wang; Nazih K Shammas; Yung-Tse Hung

By Lawrence K Wang; Nazih K Shammas; Yung-Tse Hung

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It is often necessary to transport the wastewater solids for long distances, that is, beyond the boundaries of the wastewater treatment plant site. This may be done by pumping if the material is biosolids or scum or by other methods, which shall be termed long-distance hauling. Long-distance hauling includes trucking, rail transport, and barging. Ettlich (31), in developing cost formulas for transport of wastewater sludge/biosolids, made the following general observations about the comparative economics of the longdistance transportation of dewatered sludge/biosolids methods: 1.

Pneumatic ejector. Source: US EPA (1). Fig. 20. Pneumatic conveyor. Source: US EPA (1). have provided good service for distances up to one-half mile and up to 100 ft of lift. The transport system between the points of loading and discharge is a totally enclosed pipe, which is clean and odor-free and can be easily routed along available passages. The entire system utilizes a minimum of moving parts. Consideration must be given to the use of abrasion resistant materials, especially at pipe bends, and an air pressure system consistent with the distance and lift to be traversed.

1a. Long suction line with high head loss on suction side of pump. Probable Cause 2. Unwanted (dilute) flow of sludge through pump. 1. Overpumping. 3 Troubleshooting of pumps’ operational problems 4a. Check seating and seals on valves, valve covers, valve stems, and piston on plunger pump (repair or replace damaged and worn parts). 3a. (1) Be sure suction and discharge air chambers are filled with air. (2) Change ball checks and seating arrangement. (3) Modify pumping rate. 2a. Relocate pump. 2b.

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