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

Abstract

Biological nutrient removal (BNR) in 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 twin liquid-solid 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-LSFB 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-LSFB 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

[0001] Related U.S. Application Cross Reference [0002] This patent application is a continuation-in-part application of U.S. Patent Application No. 10 / 784,890, filed February 24, 2004, which has now been adopted and published on August 28, 2007 , whose US Patent No. 7,261,811; this US Patent is a continuation-in-part of US Patent Application No. 09 / 676,453 filed February 10, 2000, both of which are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates to fluidized beds, and more particularly, the present invention relates to liquid-solid and gas-liquid-solid circulating fluidized bed arrangements particularly suitable for sewage treatment and simultaneous removal of carbon, nitrogen and phosphorus. Background technique [0004] Since Winkler first applied fluidization technology to coal gasification in the 1920s [1], fluidization technology has been developed for nearly a century. Since then, fluidized beds have been us...

AI Technical Summary

Problems solved by technology

However, one of the main difficulties is how to set up three different processes in an integrated fluidized bed system: anaerobic, anoxic and aerobic processes

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