High-efficiency low-consumption biological denitrification method for urban sewage

A technology for biological denitrification and urban sewage, applied in the field of urban sewage treatment and resource utilization, can solve the problem of high energy consumption and material consumption of biological denitrification, and achieve the effects of stable denitrification performance, cost reduction and accelerated process.

Inactive Publication Date: 2009-01-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of high energy and material consumption of existing urban sewage biological denitrification, and to provide a biological denitrification method for urban sewage with high efficiency and low consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Introduce the pretreated sewage into the high-level water tank as the water intake of the intermittent biofilter reaction system, and control the microporous aeration device at the bottom of the high-level water tank to make the dissolved oxygen concentration of the sewage in the water tank reach 8mg / L. A water outlet valve is installed at the bottom of the high-level water tank, and the water outlet flow of the water tank can be controlled by adjusting the valve knob.

[0038] 2) The intermittent biofilm filter system is made of plexiglass, with a diameter of 20cm and a height of 3m. The bottom layer of the filter column is paved with pebbles with a height of 20cm and a particle size of 1-2cm as a supporting layer, and 150cm of volcanic rock with a particle size of 6-8mm is added as a filler in the main reaction zone. The water flow direction of the intermittent biofilm filter adopts downward flow. The peristaltic pump is installed between the bottom of the biofilt...

Embodiment 2

[0042] The continuous flow biofilm filter is made of plexiglass, with a diameter of 8cm and a height of 2.8m. The bottom layer of the filter column is paved with 10cm high pebbles with a particle size of 0.5-1cm as a supporting layer, and 140cm of ceramsite with a particle size of 2-4mm is added as a filler in the main reaction zone. A microporous aeration system is installed at the bottom of the biofilter to control the dissolved oxygen concentration in the water in the biofilm filter to 2mg / L. The water flow direction of the continuous flow biofilm filter adopts upward flow.

[0043] The pretreated sewage is introduced into the continuous flow biofilm filter through a peristaltic pump, and the filtration rate is controlled to be 3m / h. The nitrous acid bacteria in the biofilm filter use the dissolved oxygen in the water to convert 56.7% of the ammonia nitrogen into nitrite. In the anaerobic environment of the system, the anammox bacteria use the ammonia nitrogen as the elect...

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Abstract

Disclosed is a high-efficiency and low-consumption biological denitrogenation method of urban sewage, which belongs to the fields of urban sewage disposal and resource utilization. The method aims to solve the problem of high energy and material consumption of the current urban sewage biological denitrogenation method. The method comprises: adopting a biomembrane filter chamber system under normal temperature, making the same biomembrane filter chamber system adapt to the respective growth metabolism condition of nitrite bacteria and anaerobic ammonium oxidation bacteria through adjusting the equipment operation parameters of a reactor, rapidly realizing the successful startup of the urban sewage anaerobic ammonium oxidation biological autotrophic denitrogenation reactor, and enabling the biomembrane filter chamber system to achieve the purpose of stabilizing the denitrogenation with high efficiency and low consumption through controlling the operational parameters of the reactor and relying on the synergic denitrogenation function of nitrite bacteria and anaerobic ammonium oxidation bacteria. The method applies a new discovery in science of a simple process of anaerobic ammonium oxidation biological autotrophic denitrogenation to the high-efficiency and low-consumption denitrogenation treatment of urban domestic sewage for the first time, and has the advantages of short startup period of the system, stable running, excellent effects of sewage disposal and low cost.

Description

technical field [0001] The invention belongs to the field of urban sewage treatment and recycling. Specifically, it relates to a high-efficiency and low-energy-consumption biological denitrification method specially used for urban sewage under normal temperature conditions. Background technique [0002] The traditional nitrification / denitrification biological denitrification process has played a very important role in the field of wastewater denitrification. However, the energy consumption in the nitrification stage is huge: if the proliferation of nitrifying bacteria in the nitrification process is not considered, the oxidation of 1g of ammonia nitrogen (NH 4 + -N) is nitrate nitrogen (NO 3 - N) will consume 4.57gO 2 , 7.14g alkalinity (as CaCO 3 In the denitrification stage, the demand for carbon source is high, and 1gNO can be reduced 3 - -N requires 2.86 g of biodegradable COD as a hydrogen donor. At present, the C / N value of urban domestic sewage is low, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 王俊安李冬张杰
Owner BEIJING UNIV OF TECH
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