Contractors vary approaches to sludge reuse

Article Abstract:

The stringent regulations imposed by the Los Angeles Bureau of Sanitation Sludge Management Unit to reduce the costs and promote efficiency of its off-site recycling program has proved successful. Ag Tech Company, BioGro Systems and San Joaquin Composting, the three contractors who were able to conform to such standards, managed to reduce costs of sludge management from $43/wet ton in 1988 to only $30 in 1991. The methods utilized by these companies and the challenges they experienced as well as ongoing developments to upgrade their services were discussed.

Recycling (Waste, etc.), Recycling, Sewage sludge, BioGro Systems, San Joaquin Composting

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Building the infrastructure for sludge reuse

Article Abstract:

Hyperion Treatment Plant built energy recovery and sewage reuse facilities to comply with a court ruling prohibiting it from dumping digested sludge in the Pacific Ocean. It took 15 years from the promulgation of the Water Pollution Control Amendments and the State Ocean Plan in 1972 for Hyperion to terminate the practice of using the ocean as a sewage disposal site. The development of on-site treatment facilities, including the Hyperion Energy Recovery System and various other facilities for sludge reuse is discussed.

Laws, regulations and rules, Design and construction, Production processes, Waste disposal in the ocean, Ocean waste disposal, Waste-to-energy power plants

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Beneficial reuse anchors shift from sea to land

Article Abstract:

The city of Los Angeles, CA, decided to manage the sludge produced by its Hyperion wastewater treatment plant through energy recovery in the 1970s. Landfilling was the immediate solution, but the city aimed for varied approaches to sludge management and 100% reuse. On-site energy recovery is presently combined with employment of off-site reuse contractors to put the 500 dry tons of sludge a day into beneficial reuse. The city's sludge is used in energy recovery and land application efforts and in making compost.

Resource recovery facilities

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