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Low energy consumption integrated hydrolysis-denitrifying ammoxidation process for treating low C/N ratio wastewater

A technology of denitrifying ammonia oxidation and low carbon to nitrogen ratio, applied in the field of environmental engineering, can solve the problems of insufficient flexibility and difficult control, and achieve the effect of improving the removal effect, reducing the complexity of the control and reducing the floor space.

Inactive Publication Date: 2010-11-24
DALIAN UNIV OF TECH
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Problems solved by technology

In the current research, the wastewater treatment process centered on denitrification and ammonia oxidation technology is complex, requiring multiple reactors and sludge reflux, which is difficult to control and lacks flexibility.

Method used

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  • Low energy consumption integrated hydrolysis-denitrifying ammoxidation process for treating low C/N ratio wastewater
  • Low energy consumption integrated hydrolysis-denitrifying ammoxidation process for treating low C/N ratio wastewater
  • Low energy consumption integrated hydrolysis-denitrifying ammoxidation process for treating low C/N ratio wastewater

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Embodiment Construction

[0014] The best embodiment of the device of the present invention will be described in detail below in conjunction with the technical scheme and accompanying drawings.

[0015] The process can be used to treat low-COD and high-ammonia-nitrogen urban domestic sewage with a C / N ratio of about 2-4. If the influent water quality changes, when the C / N ratio is higher than 4, the hydraulic retention time of the hydrolysis section should be appropriately increased according to the COD value; when the C / N ratio is low, the hydraulic retention time of the denitrification ammonium oxidation reaction section should be appropriately extended. The reactor is fed by a peristaltic pump 8, and the volume of sewage entering the second hydrolysis zone 1 and the first hydrolysis zone 2 is controlled by a liquid flow meter 10 (the display ratio of the two flow meters is set at about 1). 2 The anaerobic hydrolysis reaction in hydrolysis zone 1 removes most of the COD and produces a moderate amount...

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Abstract

The invention provides a low energy consumption integrated hydrolysis-denitrifying ammoxidation process for treating low C / N ratio wastewater, and belongs to the technical field of wastewater treatment in environment engineering. The process is characterized in that: a second hydrolysis region and an aerobic denitrification region are connected in series to provided a nitrate nitrogen electron acceptor for the denitrifying ammoxidation process; the second hydrolysis region is connected in parallel to provide volatile fatty acid and ammonia nitrogen; and autotrophic nitrogen removal without an additional carbon source can be realized in the denitrifying ammoxidation reacting region finally. The process has the advantages of improving the nitrogen pollutant removal effect without the additional carbon source, reducing aeration energy consumption and sludge yield, and reducing greenhouse gas emission compared with the traditional denitrification process; and the design of a modular reactor guided by an integrated baffle and the flow design without sludge return can effectively reduce floor area, and greatly reduce operation complexity.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to low carbon-to-nitrogen ratio wastewater treatment technology, in particular to a method for realizing the low-energy-consumption autotrophic denitrification function of low-carbon-to-nitrogen ratio wastewater. Background technique [0002] Wastewater with low carbon-to-nitrogen ratio mainly includes high-concentration ammonia-nitrogen wastewater (such as fertilizer, coking, petrochemical, pharmaceutical, food wastewater, etc.) The traditional denitrification process needs to convert ammonia nitrogen into nitrate through nitrification process, and then denitrification process through denitrification process. However, the nitrification process requires high oxygen demand and high energy consumption; the denitrification process requires organic carbon sources as electron donors. For wastewater with a low carbon-to-nitrogen ratio, currently sewage treatment plants usu...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30
Inventor 张捍民高范杨凤林
Owner DALIAN UNIV OF TECH
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