Biological phosphorus removal
First Claim
1. A process for treating waste water to remove phosphorous and nitrogen in a treatment system including an anaerobic zone including an anaerobic mixed liquor having organisms which release phosphorous;
- an anoxic zone including an anoxic mixed liquor having denitrifying phosphorous accumulating organisms which uptake phosphorous and an aerobic zone including an aerobic mixed liquor having organisms which further uptake phosphorous;
the process comprising the steps of;
(a) providing wastewater to be treated into the anaerobic zone;
(b) communicating anaerobic mixed liquor from the anaerobic zone to the anoxic zone;
(c) communicating anoxic mixed liquor from the anoxic zone to the anaerobic zone;
(d) communicating anoxic mixed liquor from the anoxic zone to the aerobic zone;
(e) applying aerobic mixed liquor to a feed side of a membrane filter;
(f) producing a treated effluent from a filtrate side of the membrane filter;
(g) flowing oxygen-containing gas bubbles past the feed side of said membrane filter to remove accumulated solids;
(h) communicating at least some of the material rejected by the membrane filter to a degassing device to remove some or all of any dissolved oxygen contained in said rejected material; and
(i) communicating said degassed material to the anoxic zone.
12 Assignments
0 Petitions
Accused Products
Abstract
A process for treating waste water to remove phosphorous and nitrogen in a treatment system including an anaerobic zone (5) containing an anaerobic mixed liquor having organisms which release phosphorous into the anaerobic mixed liquor; an anoxic zone (7) containing an anoxic mixed liquor having organisms which uptake phosphorous and denitrify the anoxic mixed liquor and an aerobic zone (9) containing an aerobic mixed liquor having organisms which uptake phosphorous and nitrify the aerobic mixed liquor; the process including the steps of providing wastewater to be treated into the anaerobic zone (5) and communicating anaerobic mixed liquor from the anaerobic zone (5) to the anoxic zone (7). The anoxic mixed liquor is then communicated from the anoxic zone (7) to the anaerobic zone (5) and the anoxic mixed liquor from the anoxic zone (7) to the amble zone (9). The aerobic mixed liquor is applied to a feed side of a membrane filter (10) to produce a treated effluent from a filtrate side of the membrane filter (10). Oxygen-containing gas bubbles is flowed past the feed side of the membrane filter (10) to remove accumulated solids. At least some of the material rejected by the membrane filter (10) is communicated to a degassing device (20) to remove some or all of any dissolved oxygen contained in the rejected material and the degassed material is communicated to the anoxic zone (7).
53 Citations
6 Claims
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1. A process for treating waste water to remove phosphorous and nitrogen in a treatment system including an anaerobic zone including an anaerobic mixed liquor having organisms which release phosphorous;
- an anoxic zone including an anoxic mixed liquor having denitrifying phosphorous accumulating organisms which uptake phosphorous and an aerobic zone including an aerobic mixed liquor having organisms which further uptake phosphorous;
the process comprising the steps of;(a) providing wastewater to be treated into the anaerobic zone; (b) communicating anaerobic mixed liquor from the anaerobic zone to the anoxic zone; (c) communicating anoxic mixed liquor from the anoxic zone to the anaerobic zone; (d) communicating anoxic mixed liquor from the anoxic zone to the aerobic zone; (e) applying aerobic mixed liquor to a feed side of a membrane filter; (f) producing a treated effluent from a filtrate side of the membrane filter; (g) flowing oxygen-containing gas bubbles past the feed side of said membrane filter to remove accumulated solids; (h) communicating at least some of the material rejected by the membrane filter to a degassing device to remove some or all of any dissolved oxygen contained in said rejected material; and (i) communicating said degassed material to the anoxic zone. - View Dependent Claims (2, 3, 4, 5, 6)
- an anoxic zone including an anoxic mixed liquor having denitrifying phosphorous accumulating organisms which uptake phosphorous and an aerobic zone including an aerobic mixed liquor having organisms which further uptake phosphorous;
Specification