Method of waste treatment and algae recovery

Plant husbandry – Algae culture

Patent

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Details

210 11, C02C 100, A01G 3100

Patent

active

040055469

ABSTRACT:
A method of waste treatment and algae recovery involves making available in a first pond open to light and air a first body of waste water such as sewage containing algae, the algae growing on the contained nutrients. The first body is retained under natural culture conditions for a predetermined detention period, usually several days, and is then transferred to a second pond as a second body open to light and air. To the second body some normal algal nutrients are added and more particularly the body is continuously agitated at a moderate rate to maintain the growing algae in suspension. Preferably, to the second body and with the nutrients, there is added an amount of lime insufficient to cause coagulation of the algae. After a predetermined detention time of several days in the second, mixing pond the mixed material is transferred to a third pond. The third pond is shielded from the light and is dark. The third pond is unagitated and is quiet. The algae therein readily separate by gravity to the bottom of the pond. The remaining relatively clean, supernatant liquid is withdrawn at the top while the settled algae are removed from the bottom. Some of the removed algae may be recirculated to the first pond for inoculation.

REFERENCES:
patent: 3429806 (1969-02-01), Carter et al.
patent: 3431200 (1969-03-01), Davis et al.
patent: 3462360 (1969-08-01), McKinney
patent: 3546812 (1970-12-01), Kobayashi et al.
patent: 3598726 (1971-08-01), Welch
patent: 3645040 (1972-02-01), Ort
patent: 3732089 (1973-05-01), Megronigle
patent: 3768200 (1973-10-01), Klock
Algal Culture from Laboratory to Pilot Plant, Burlew, Carnegie Inst. of Wash. Publ. No. 600, 1953, pp. 107, 113, 143-152, 194, relied on.

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