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US 10,370,274 B2Granted
Hybrid reactor and process for removing selenium
AssigneeBl Technologies, Inc.
InventorsMinggang Liu, Jeffrey Ronald Cumin, Glenn Vicevic, Carsten Owerdieck, Nelson Fonseca
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Abstract
A system for treating wastewater containing selenium has a sequencing batch reactor upstream of a fixed film reactor. The sequencing batch reactor may be operated under anoxic conditions while influent is mixed with residual sludge. The SBR reduces total nitrogen, suspended solids, or both. Selenium is removed in the fixed film reactor by biological reduction to elemental selenium.
Claims7
An apparatus for treating water containing selenium comprising:
- a) an upstream sequencing batch reactor;
- and
- b) a downstream fixed film reactor reaction vessel coupled with the sequencing batch reactor and configured to remove selenium from water.
A process for treating water containing selenium comprising the steps of:
- a) mixing a batch of influent water with sludge containing living microorganisms;
- b) separating the mixture to produce an intermediary stream containing reduced concentrations of one or more of total nitrogen, sparingly soluable salts, and total suspended solids;
- and,
- c) reducing the selenium species in the intermediary stream.
1 more element
Dependencies are inferred from the claim text.