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Synchronous anaerobic denitrification and desulfurization process

A denitrification and process technology, applied in the field of synchronous anaerobic denitrification and desulfurization process, can solve problems such as consumption

Inactive Publication Date: 2007-08-01
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

[0013] In the synchronous anaerobic denitrification and desulfurization reactor, the anaerobic digested sludge from the urban sewage treatment plant was used as the inoculum, and the simulated wastewater with a ratio of nitrite to sulfide (mol / mol) of about 2:3, Start the synchronous anaerobic denitrification and sulfur removal reactor. The main process conditions controlled are: hydraulic retention time is 2.0d, nitrite and sulfide (substrate) concentrations are 21mg N / L and 32mg S / L respectively, reaction temperature is 30°C, and pH is about 7. The process can remove sulfide and nitrite at the same time, 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

[0015] Using the anaerobic digested sludge from the urban sewage treatment plant as the inoculum, the denitrification and desulfurization process was run with simulated wastewater with a ratio of nitrite to sulfide (mol / mol) of about 12:3. The main process conditions controlled: the hydraulic retention time is 1.0d, the concentration of nitrite and sulfide (matrix) is 3325mgN / L and 1900mgS / L, the reaction temperature is 35℃, and the pH value is about 7. The volumetric removal loads of sulfide and nitrite are up to 1.918kgS / (m 3 · d) and 2.03kg N / (m 3 d).

Embodiment 3

[0017] Using anaerobic digested sludge from urban sewage treatment plants as inoculum, sulfide and nitrite were removed simultaneously. The main process conditions controlled are: hydraulic retention time is 2.0d, nitrite and sulfide (substrate) concentrations are 2270mg N / L and 1920mg S / L respectively, reaction temperature is 30°C, and pH is about 9. The process can remove sulfide and nitrite at the same time, and the volumetric removal loads of sulfide and nitrite respectively reach 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 sulfur removal process. Background technique [0002] In the wastewater of fermentation, chemical industry, pharmaceutical (pesticide and medicine) and many other industries, it not only contains high concentration of organic pollutants, but also contains high concentration of sulfate and ammonia nitrogen. Taking the monosodium glutamate wastewater in the fermentation industry as an example, the COD concentration of the off-mating tailing liquid is as high as 30,000-70,000 mg / L, and the NH 4 + -N concentration up to 2000~12000mg / L, SO 4 2- The concentration is as high as 20000-60000mg / L, and more than 15 million tons of this kind of wastewater are discharged nationwide every year. [0003] Due to the advantages of high load rate, low energy consumption, low operating cost, low sludge production, and recyclable energy, anaerobic biological treatment technology has become the mainst...

Claims

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Application Information

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IPC IPC(8): C02F3/28C01B17/02C01B21/02
Inventor 郑平蔡靖
Owner ZHEJIANG UNIV
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