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Liquid-solid circulating fluidized bed waste water treatment system for simultaneous carbon, nitrogen and phosphorus removal

A circulating fluidized bed, fluidized bed technology, applied in the field of fluidized bed, can solve the problem of low removal efficiency

Inactive Publication Date: 2007-02-28
UNIV OF WESTERN ONTARIO
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although nitrogen can be removed by simultaneous nitrification-denitrification in biofilters [23] by alternating oxygenic and anoxic conditions in the filter, the removal efficiency is extremely low (approximately 20% of influent nitrogen)

Method used

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  • Liquid-solid circulating fluidized bed waste water treatment system for simultaneous carbon, nitrogen and phosphorus removal
  • Liquid-solid circulating fluidized bed waste water treatment system for simultaneous carbon, nitrogen and phosphorus removal

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Embodiment

[0039] A flow diagram of the fixed film biological nutrient removal process used in the liquid-solid circulating fluidized bed 100 (FIG. 3) of the present invention is depicted in FIG. Referring to FIG. 3 , the aerobic process occurs in the downflow bed 10 , the anoxic process occurs in the lower portion of the upflow bed 12 , and the anaerobic process occurs in the upper portion of the upflow bed 12 . It is also possible to make the anoxic process take place in the upper part of the uplifted bed, and the anaerobic process take place in the lower part of the uplifted bed. But at this time, most of the nitrification effluent from the aerobic zone needs to be supplied to the bottom of the anoxic zone in the middle of the ascending fluidized bed. Raw sewage 72 (primary influent or primary effluent) is first mixed with anoxic / anaerobic effluent recirculation stream 74 from liquid-solid separator 46 at the top of the raised bed and then fed into the bottom of the raised bed 12, whe...

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Abstract

Biological nutrient removal (BNR) in municipal wastewater treatment to remove carbonaceous substrates, nutrients and phosphorus, has recently become increasingly popular worldwide due to increasingly stringent regulations. Biological fluidized bed (BFB) technology, which could be potentially used for BNR processes, can provide some advantages such as high efficiency and compact structure. This present invention incorporates the fixed-film biological fluidized bed technology with the biological nutrient removal in a liquid-solid circulating fluidized bed, which has achieved the simultaneous elimination of organic carbon, nitrogen and phosphorus, in a very efficient manner and with very compact space requirements. The BNR-LSCFB has two fluidized beds, running as anoxic / anaerobic and aerobic processes to accomplish simultaneous nitrification and denitrification and to remove carbonaceous substrates, nutrients and phosphorus, with continuous liquid and solids recirculation through the anoxic / anaerobic bed and the aerobic bed. The new BNR-LSCFB system is not only an excellent alternative for conventional activated sludge type BNR technologies but is also capable of processing much higher loadings and suitable for industrial applications.

Description

field of invention [0001] The invention relates to a fluidized bed, in particular, the invention relates to a liquid-solid and gas-liquid-solid circulating fluidized bed system which is especially suitable for sewage treatment and simultaneous removal of carbon, nitrogen and phosphorus. Background of the invention [0002] Since Winkler first applied fluidization technology to the gasification of coal in the 1920s, fluidization technology has been developed for nearly a century [1]. Since then, fluidized beds have been used in many different applications such as gas-solid, liquid-solid, and gas-liquid-solid contactors, and as chemical and biological reactors for a variety of different processes. [0003] The application of fluidized beds to biological wastewater treatment processes stems from the observed denitrification phenomenon during the removal of organic matter from chemically treated wastewater using activated carbon in a fluidized bed [2]. Since then, biological fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/08C02F1/00C02F3/30B01D15/02B01D15/04B01D15/18B01D24/00B01D24/36B01J47/10B01J49/00C02F1/42C02F3/00C02F3/12
CPCC02F3/104B01J47/10B01D15/1807C02F3/30C02F3/085B01D2215/021Y10S210/903C02F3/308B01J49/0026Y10S210/906B01J49/10Y02W10/10
Inventor 乔治·纳赫拉祝京旭崔玉波
Owner UNIV OF WESTERN ONTARIO
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