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| Muddy and waste water treatment method |
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| Liquid treatment |
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| Method for recovering etchant from etching waste liquid containing iron chloride |
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| Small diameter dual pump pollutant recovery system |
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Anaerobic migrating blanket reactor
| Details |
Inventors: Dague, deceased, Richard R.; Angenent, Largus T.;
Assignee: Iowa State University Research Foundation, Inc. (Ames, IA)
Primary Examiner: Wyse; Thomas G.
Assistant Examiner:
Attorney, Agent or Firm: Henderson & Sturm
A continuously fed, compartmentalized reactor that reverses its flow in a horizontal manner. This system is developed without the requirement of elaborate gas-solids-separator and feed-distribution systems. Effluent recycling is not required, but mixing is necessary to obtain a sufficient biomass/substrate contact. This process is known as the anaerobic migrating blanket reactor (AMBR). A key to the selection of a granular biomass in the AMBR process, and thus to the reactor performance, is the migration of the blanket through the reactor. A higher rate of migration of flocculent biomass, compared with granular biomass, is responsible for the wash out of less settleable, flocculent biomass. In this way, the formed aggregates are retained in the reactor and grow in size. |
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DETAILED DESCRIPTION OF THE INVENTION The following examples are all illustrative of the best mode of carrying out the invention.
They are obviously not to be construed as limitative of the invention since various other embodiments can readily be envolved in view of the teachings provided herein.
EXAMPLE 1 In this example, the performances and principles of laboratory-scale AMBRs were investigated by feeding it sucrose as a synthetic substrate.
Furthermore, the obtained results were compared with the performances of laboratory-scale UASB and ASBR systems, which have been operated under the same conditions.
ABSTRACT A 12-liter anaerobic migrating blanket reactor (AMBR) was capable of achieving a maximum COD loading rate of 30 g/L/d at a 12 hour HRT, which resulted in a SMPR of 7 L/L/d.
Although sucrose was fed as a synthetic substrate, no pre-acidification was required for the AMBR.
Short circuiting could be prevented in the 54-liter AMBR by placing baffles between the compartments instead of openings in the bottom of the inside walls.
This resulted in a SCOD removal of 99% up to a COD loading rate of 23 g/L/d.
Next, the AMBR was able to retain high levels of biomass (40 gMLVSS/L) even at COD loading rates which exceeded 20 g/L/d.
Both laboratory scale AMBRs were able to maintain and grow granular biomass, which resulted in an increase of the granule size over the operational period.
A key element in the selection of granular biomass was the migration of the blanket through the reactor in wich flocculent biomass would migrate faster and would eventually wash out of the reactor.
Furthermore, baffles in front of the effluent port and intermittent mixing of the final compartment have increased the selection pressure.
Moreover, reversing of the flow was required to prevent phase separation and accumulation of biomass in the final compartment.
Compared with a laboratory scale ASBR and UASB reactor, the performance of the AMBR was found to be superior due to approached plug-flow conditions in the compartmentalized AMBR
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