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
View PDF0 Cites 5 Cited by
  • 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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0012] Example 1

[0013] In the synchronous anaerobic denitrification and sulfur removal reactor, the anaerobic digested sludge of the municipal sewage treatment plant was used as the inoculum, and the simulated wastewater with the ratio of nitrite to sulfide (mol / mol) was about 2:3. Start the synchronous anaerobic nitrogen and sulfur removal reactor. The main process conditions controlled are: hydraulic retention time of 2.0 d, nitrite and sulfide (substrate) concentrations of 21 mg N / L and 32 mg S / L, respectively, reaction temperature of 30 °C, and pH of about 7. The process can remove sulfide and nitrite at the same time, the sulfide concentration in the effluent is less than 1 mgS / L, and the removal rates of sulfide and nitrite are 98.8% and 94.7%, respectively.

Example Embodiment

[0014] Example 2

[0015] The anaerobic digestion sludge of the municipal sewage treatment plant was used as the inoculum, and the simulated wastewater with the ratio of nitrite to sulfide (mol / mol) was about 12:3, and the denitrification and sulfur removal process was run. The main process conditions controlled: the hydraulic retention time is 1.0d, the concentration of nitrite and sulfide (substrate) is 3325mgN / L and 1900mgS / L, the reaction temperature is 35℃, and the pH value is about 7. The volumetric removal load of sulfide and nitrite reaches 1.918kgS / (m 3 d) and 2.03kg N / (m 3 d).

Example Embodiment

[0016] Example 3

[0017] The anaerobic digested sludge from the municipal sewage treatment plant was used as the inoculum to simultaneously remove sulfide and nitrite. The main process conditions controlled are: hydraulic retention time of 2.0 d, nitrite and sulfide (substrate) concentrations of 2270 mg N / L and 1920 mg S / L, respectively, reaction temperature of 30 °C, and pH of about 9. This process can remove sulfide and nitrite at the same time, and the volume removal load of sulfide and nitrite can reach 0.73kg S / (m 3 d) and 0.96kg N / (m 3 d).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F3/28C01B17/02C01B21/02
Inventor 郑平蔡靖
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap