Waste water treatment, media therefor and its manufacture

Details Waste water treatment, media therefor and its manufacture Waste water treatment, media therefor and its manufacture

1999-06-22

2000-12-05

Upton, Christopher

Liquid purification or separation

Processes

Treatment by living organism

210617, 210150, 428404, 428407, C02F 300

Patent

active

061562041

ABSTRACT:
Granules of plastics material have grains of an inert mineral such as sand coated thereon to provide a habitat for microorganisms effective in waste water treatment, the granules having a predetermined particle size range, and the grains having a predetermined particle size range and being disposed at a predetermined packing density range on the granules. The particles have an average density of approximately 1.0 g/cc such that a proportion tend to float and a proportion tend to sink in the waste water. The particles arc manufactured by contacting the granules of plastics material with a mixture of grains of the inert mineral and grains of a soluble substance such as salt, at an elevated temperature, to coat the granules with the mixture, and subsequently dissolving the soluble substance grains from the coating to provide the granules coated with the grains of inert mineral in the predetermined packing density range.

REFERENCES:
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patent: 4243696 (1981-01-01), Toth
patent: 4576718 (1986-03-01), Reischl et al.
patent: 4620931 (1986-11-01), Hirata et al.
patent: 4983299 (1991-01-01), Lupton et al.
patent: 5126042 (1992-06-01), Malone
patent: 5166072 (1992-11-01), Krauling et al.
patent: 5458779 (1995-10-01), Odeguard
patent: 5486292 (1996-01-01), Bair et al.
patent: 5569634 (1996-10-01), Miller et al.

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