Device and method for treating low C/N ratio nitrified wastewater

A sewage treatment method and technology for sewage treatment devices, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problems of unstable nitrification effect and long nitrification start-up time, etc. Achieve significant energy-saving effect, good effluent quality, and low operating cost.

Active Publication Date: 2011-07-06
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to overcome the shortcomings of the existing low-carbon-nitrogen ratio high-ammonia-nitrogen wastewater nitrification start-up time is long, the nitrification effect is unstable, etc., to provide a sewage treatment device and method for low carbon nitrogen ratio nitrification

Method used

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  • Device and method for treating low C/N ratio nitrified wastewater
  • Device and method for treating low C/N ratio nitrified wastewater
  • Device and method for treating low C/N ratio nitrified wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The 2300t / d high-concentration nitrogen-containing wastewater from a bioengineering company enters the regulating tank first, and then enters the aerobic tank through the sewage lifting pump. The compressed air generated by the blower aerates the sewage through the liftable aeration pipe, and the air volume of the blower is adjusted to control The dissolved oxygen is at 2.0mg / L; the return sludge in the secondary sedimentation tank enters the aerobic tank synchronously; a steam pipe is installed at the water inlet of the aerobic tank to heat the sewage, and the water temperature is controlled at 35°C and pH=8.5. Nitrosation reaction; the sewage enters the first hypoxic tank and the second hypoxic tank through the outlet at the bottom of the aerobic tank. Perforated tube aeration is arranged in the two hypoxic tanks for intermittent aeration, and a submersible mixer is set up for stirring, so as to control The dissolved oxygen is 1.0 mg / L, and the volume ratio of the aero...

Embodiment 2

[0037] A pharmaceutical high-concentration nitrogen-containing wastewater first enters the regulating tank, and then enters the aerobic tank through the sewage lifting pump. The compressed air generated by the blower aerates the sewage through the lifting aeration pipe, and the air volume of the blower is adjusted to control the dissolved oxygen at 1.0mg / L ; The return sludge in the secondary sedimentation tank enters the aerobic tank synchronously; a steam pipe is installed at the water inlet of the aerobic tank to heat the sewage, and the water temperature is controlled at 28°C and pH=7.6 to carry out nitrosation reaction; the sewage passes through well The water outlet at the bottom of the oxygen tank enters the first hypoxic tank and the second hypoxic tank. Perforated tube aeration is arranged in the two hypoxic tanks for intermittent aeration, and a submersible mixer is set up for stirring to control the dissolved oxygen to 0.8mg / L , the volume ratio of the aerobic tank t...

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Abstract

The invention discloses a device and a method for treating low C / N ratio nitrified wastewater. The device comprises a regulating reservoir, a wastewater lifting pump, a first anaerobic tank, an aerobic tank, a second anaerobic tank, perforated pipe aerators, a lifting aerator pipe, a secondary sedimentation tank, a sludge pump, a submersible mixer, a steam pipe and a blower. Wastewater enters into the regulating reservoir and then enters into the aerobic tank through the lifting pump, the wastewater in the aerobic tank is aerated and heated, and meanwhile, the returned sludge in the secondary sedimentation tank synchronously enters into the aerobic tank; wastewater enters into the two anaerobic tanks through a water outlet at the bottom of the aerobic tank, the wastewater in the two anaerobic tanks is intermittently aerated, and the submersible mixer is arranged for stirring; and wastewater enters into the secondary sedimentation tank for solid-liquid separation through water outlets of the two anaerobic tanks, wherein partial sludge returns to the aerobic tank through the sludge pump, and the rest sludge is treated. The device has the advantages of low DO, (dissolved oxygen), zero external carbon source, high nitrification efficiency, simple structure, small occupied area, less investment, low running cost and continuous / intermittent operation.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a sewage treatment device and method for nitrification of low-carbon nitrogen ratios. Background technique [0002] For sewage with low carbon-to-nitrogen ratio and high ammonia-nitrogen, the traditional biological denitrification process generally includes the oxidation of ammonia nitrogen to NO 2 - , NO 3 - nitrification and NO 2 - , NO 3 - Revert to N 2 The two stages of denitrification; but the dissolved oxygen in the nitrification stage is generally 3~6mg / l, the aeration energy consumption is high, and it is easy to consume alkalinity; the denitrification stage requires organic carbon sources, otherwise the denitrification is incomplete; for medicine, Chemical, fertilizer, tanning, landfill leachate, livestock and poultry breeding and other wastewater with low carbon-to-nitrogen ratio and high ammonia-nitrogen need to add carbon sources such as metha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
Inventor 梅荣武沈浙萍韦彦斐方建敏李欲如
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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