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Apparatus and method for treating fgd blowdown or similar liquids

A technology of equipment and treatment steps, applied in the field of water treatment, can solve the problem of selenium not being removed

Active Publication Date: 2008-07-16
ZENON TECH PARTNERSHIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The allowable concentration of selenium can be 0.5ppm or less or 200ppb or less, however in the traditional treatment plant sewage can contain 1-20 or 2-10ppm of selenium that has not been removed

Method used

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  • Apparatus and method for treating fgd blowdown or similar liquids
  • Apparatus and method for treating fgd blowdown or similar liquids
  • Apparatus and method for treating fgd blowdown or similar liquids

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Embodiment Construction

[0023] Various devices or methods will be described below to provide examples of embodiments of the present invention. The following embodiments are non-limiting to the present invention, and the present invention can cover processes or equipment not described below. The present invention is not limited to the equipment or process that has all the features of any one of the following equipment or processes or is not limited to the features common to most or all of the following equipment. The following equipment or process may not be an embodiment of the present invention. The applicant, inventor and proprietor reserve all rights in any inventions disclosed in the following equipment or processes that are not required by this document and the disclosure of this document is not waived or disclosed to the public.

[0024] Table 1 shows the assumed pollutants and their concentrations in the FGD scrubber effluent in the embodiment concept of the equipment and method described further ...

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Abstract

A process has steps of one or more of aerobic treatment to remove COD and nitrify a waste stream, anoxic treatment to denitrify a waste stream, anoxic treatment to remove selenium and anaerobic treatment to remove heavy metals and sulphur. The process may be used to treat, for example, FGD blow down water. The process may further include one or more of (a) membrane separation of the waste stream upstream of the anoxic digestion to remove selenium, (b) dilution upstream of the biological treatment step, (c) physical / chemical pretreatment upstream of the biological processes or dilution step to remove TSS and soften the waste stream, or (d) ammonia stripping upstream of the biological treatment steps or dilutions step. These processes may be provided in a variety of suspended growth or fixed film reactors, for example a membrane bioreactor or a fixed film reactor having a GAC bed. Processes for biological treatment of inorganic compounds in a fixed medium reactor is described including steps of one or more of maintaining desired ORP levels, optionally by controlling nutrient addition, and removing solids or gas bubbles from the medium bed.

Description

[0001] For the United States, pursuant to 35USC 119(e), this application claims the rights of U.S. Patent Application 60 / 701,996 filed on July 25, 2005 and U.S. Patent Application 60 / 736,859 filed on November 16, 2005. This application claims the priority of Canadian patent application 2,517,322 filed on August 26, 2005. The full text of the aforementioned application is hereby incorporated by reference. Technical field [0002] The present invention relates to water treatment, including biological water treatment and feedstocks containing inorganic pollutants (such as selenium, nitrate or heavy metals) (for example, scrubber blow down from the flue gas desulfurization (FGD) process of coal-fired power plants) Water) treatment. Background technique [0003] The following discussion of the background art does not imply or acknowledge that any of the following methods or devices are prior art or part of the common knowledge of those skilled in the art in any country. [0004] The sc...

Claims

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Application Information

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IPC IPC(8): C02F3/30B01D53/22
CPCY02E50/343Y02E50/30Y02W10/10
Inventor 杰弗里·G·皮特斯威廉·A·邦科斯基皮埃尔·L·科特希达亚特·胡塞恩蒂莫西·M·皮克特
Owner ZENON TECH PARTNERSHIP