Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for obtaining stable nitrite accumulation by sewage denitrification

A nitrite and denitrification technology, applied in the field of sewage biological denitrification, to achieve the effect of easy control and stable nitrite accumulation

Inactive Publication Date: 2009-12-16
BEIJING UNIV OF TECH
View PDF0 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing method of using biological nitrification to obtain nitrite accumulation in the field of sewage treatment, and propose to use the biological denitrification approach to obtain nitrite accumulation, so as to provide a stable source of nitrite for the anaerobic ammonium oxidation process

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for obtaining stable nitrite accumulation by sewage denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] The application of the present invention is illustrated below through a specific example.

[0022] A 20L SBR reactor was used to cultivate denitrified sludge. During the anoxic period, an electric stirrer was used for stirring, and for the aerobic period, microporous aerators were used for aeration. During the cultivation period, the temperature of the mixed solution in the reactor was controlled at 20-25°C by using a temperature-controlled heating rod.

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

PropertyMeasurementUnit
chemical oxygen demand (mass)aaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for biological sewage treatment, in particular to a method for obtaining stable nitrite accumulation by sewage denitrification. By controlling the biological denitrification process of an activated sludge method, the method realizes the reduction of nitric acid salt and incomplete reduction of nitrite so as to obtain the stable nitrite accumulation. The method adjusts carbon nitrogen ratio of sewage and controls the carbon nitrogen ratio to be between 2.4 and 3.2 by using methanol or other external carbon sources, indicates the denitrification process of the activated sludge method by using the changing characteristics of the pH value, and finally realizes converting the nitric acid salt in the sewage into the nitrite to obtain the stable nitrite accumulation. The nitrite accumulation obtained by the method can reach around 25 percent of the amount of initial nitric acid salt of denitrification reaction. The nitrite can be taken as a nitrite source of anaerobic ammonium oxidation reaction.

Description

technical field [0001] The invention relates to the field of sewage treatment, and is a method for biological denitrification of sewage. Background technique [0002] At present, my country's water environment is not optimistic, and the eutrophication problem of algae growing wildly occurs continuously in water bodies such as Taihu Lake and Dianchi Lake. Eutrophication has become a common phenomenon in my country's water bodies and has a further development trend. The eutrophication of water not only seriously damages the water ecology, but also seriously affects the safety of drinking water. Nitrogen and phosphorus contained in a large amount of discharged sewage is the main cause of water eutrophication. Therefore, nitrogen and phosphorus in sewage have become the main removal objects of sewage treatment. [0003] The removal of nitrogen in sewage has long used the method of biological nitrification and denitrification, that is, the use of biological nitrification to con...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
Inventor 孟雪征付昆明曹相生钱栋
Owner BEIJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com