Synchronous anaerobic denitrification and desulfurization process

A denitrification and process technology, which is applied in the field of synchronous anaerobic denitrification and desulfurization process, can solve the problems of consumption, achieve the effect of saving oxygenation energy consumption and realizing the effect of recycling waste

Inactive Publication Date: 2009-06-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of the SHARON process can save energy for oxidizing nitrite to nitrate, and can also save electron donors for reducing nitrate to nitrite, it still needs to consume electron donors for reducing nitrite to nitrogen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] In the synchronous anaerobic denitrification and desulfurization reactor, the anaerobic digested sludge of the municipal sewage treatment plant is used as the inoculum, and the ratio of nitrite to sulfide (mol / mol) is about 2:3. Start the synchronous anaerobic denitrification and desulfurization reactor. The main process conditions controlled are: the hydraulic retention time is 2.0 days, the nitrite and sulfide (matrix) concentrations are 21mg N / L and 32mg S / L, respectively, the reaction temperature is 30°C, and the pH is about 7. The process can simultaneously remove sulfide and nitrite, the concentration of sulfide in the effluent is less than 1mgS / L, and the removal rates of sulfide and nitrite are 98.8% and 94.7%, respectively.

Embodiment 2

[0014] The anaerobic digested sludge of the municipal sewage treatment plant is used as the inoculum, and the simulated wastewater with a ratio of nitrite to sulfide (mol / mol) of about 12:3 is used to run the denitrification and desulfurization process. The main process conditions controlled: hydraulic retention time is 1.0d, nitrite and sulfide concentration (matrix) concentration is 3325mgN / L and 1900mg S / L, reaction temperature is 35℃, pH value is about 7. The volume removal load of sulfide and nitrite reached 1.918kg S / (m 3 ·D) and 2.03kg N / (m 3 · D).

Embodiment 3

[0016] The anaerobic digested sludge of a municipal sewage treatment plant is used as an inoculum to simultaneously remove sulfide and nitrite. The main process conditions controlled are: the hydraulic retention time is 2.0 days, the nitrite and sulfide (matrix) concentrations are 2270 mg N / L and 1920 mg S / L, respectively, the reaction temperature is 30°C, and the pH is about 9. The process can remove sulfide and nitrite at the same time, and the volume removal load of sulfide and nitrite is 0.73kg S / (m 3 ·D) and 0.96kg N / (m 3 · D).

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PUM

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Abstract

The invention discloses a synchronous anaerobic denitrifying desulfurizing technique, which is characterized by the following: adopting anaerobic digestive sludge or anaerobic active sludge with organic wastewater with sulfate as inoculating material; oxidizing sulfate into elemental sulfur; reducing nitrite into nitrogen; setting the density of nitrite and sulfate at 20-2270mg N / L and 30-1920mg S / L with molar rate at 0.5-4.0; controlling reacting temperature at 20-35 deg.c and pH value at 6-9; setting the hydraulic retaining time for 0.08-2.0d; using nitrite as electron acceptor and sulfate as electron provider; realizing the removal of two pollutions without providing oxygen.

Description

Technical field [0001] The invention relates to a synchronous anaerobic denitrification and desulfurization process. Background technique [0002] Wastewater in many industries, such as fermentation, chemical industry, and pharmaceuticals (pesticides and medicines), not only contains high concentrations of organic pollutants, but also contains high concentrations of sulfate and ammonia nitrogen. Take the monosodium glutamate wastewater in the fermentation industry as an example, the COD concentration of its leftover tail liquid is as high as 30,000~70,000mg / L, NH 4 + -N concentration is as high as 2000~12000mg / L, SO 4 2- The concentration is as high as 20,000 to 60,000 mg / L, and more than 15 million tons of this type of wastewater are discharged nationwide each year. [0003] Because anaerobic biological treatment technology has the advantages of high load rate, low energy consumption, low operating cost, low sludge output, and recyclable energy, it has become the mainstream pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C01B17/02C01B21/02
Inventor 郑平蔡靖
Owner ZHEJIANG UNIV
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