Device and method for treating low-temperature high-ammonia nitrogen wastewater by use of constant magnetic field

A constant magnetic field, high ammonia nitrogen technology, applied in sustainable biological treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of unstable operation of the reactor at low temperature, low nitrosation efficiency, substandard effluent, etc. Achieve the effect of shortening residence time, efficient nitrosation, and reducing power consumption

Active Publication Date: 2015-09-16
NANJING UNIV
View PDF4 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of low nitrosation efficiency of whole-process autotrophic biological denitrification of low-temperature high-ammonia-nitrogen wastewater, resulting in substandard effluent and unstable operation of the reactor at low temperature, the present invention provides a device and method for treating low-temperature high-ammonia-nitrogen wastewater using a constant magnetic field , by adopting the magnetic field-ammonia oxidizing bacteria strengthening sy...

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
  • Device and method for treating low-temperature high-ammonia nitrogen wastewater by use of constant magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the structure schematic diagram of the enhanced sewage treatment device using changing magnetic fields includes: two magnets 10 are arranged symmetrically outside the short-path nitrification SBR reactor 1, and the two magnets 10 form a horizontal magnetic field in the reactor; the short-path nitrification SBR reactor 1 is connected to Sewage pipes, drain pipes, sludge discharge pipes, aeration pipes, and lye inlet pipes; a peristaltic pump 3 is installed on the sewage pipe; a water outlet valve 4 is installed on the drain pipe; a sludge discharge valve 6 is installed on the sludge discharge pipe; The lye inlet valve 11 is set on the liquid inlet pipe; the sewage tank 2 is connected to the short-range nitrification SBR reactor 1 through the sewage pipe; the reactor outlet water enters the outlet tank 5 through the drain pipe; the aeration pump 3 is connected to the short-range nitrification reactor through the aeration pipe SBR reactor 1; the ...

Embodiment 2

[0034] Taking the high ammonia nitrogen wastewater of a sewage plant as the research object (pH=8.0, COD=570mg / L, NH 4 + -N=960mg / L), its waste water treatment step is

[0035] (a) design square short-range nitrification SBR reactor 1, the height of this reactor: length: width=4: 2: 1, fill activated sludge in this reactor 1, form activated sludge zone at its bottom; Then Symmetrically installed on both sides of the reactor 1, the magnetic medium is mainly composed of BaFe 12 o 19 and SrFe 12 o 19 ferrite magnet 10, keep the two magnets 10 relatively parallel, design the area of ​​the magnet 10 so that the activated sludge area is in the range of the magnetic field, and indicate the magnetic field strength through the magnetic field measuring instrument 15, and the upper and lower ends of the magnet 10 are respectively fixed on the fixed The position on the board and on the board is adjustable, and the distance between the two magnets 10 is adjusted so that the central fi...

Embodiment 3

[0040] The sewage treatment device of the present embodiment 3 is the same as that of the embodiment 1, and its difference is that the neutral magnetic field strength of the reactor is controlled to be 100mT, and the high ammonia nitrogen waste water of a certain sewage plant is the research object (pH=7.7, COD=730mg / L, NH 4 + -N=1150mg / L), its waste water treatment step is

[0041] (a) Inoculate activated sludge under the low temperature condition of 15°C, the sludge concentration is 4000mg / L, the waste water is pumped into the reactor 1 through the peristaltic pump 3 every cycle, the influent volume is 20% of the effective volume of the reactor, and then gradually Increase to 50%, carry out continuous aeration and stirring during the reaction period, the stirring speed is 250r / min, so that the activated sludge is in a suspended state, the aeration time is 300min, and the sedimentation is 50min. After sedimentation, open the outlet valve 4 to drain water, and the drainage ra...

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 device and a method for treating low-temperature high-ammonia nitrogen wastewater by use of a constant magnetic field. The device mainly comprises a shortcut nitrification SBR reactor, magnetic field intensifying devices symmetrically arranged on the two sides of the reactor, an online shortcut nitrification monitoring system and a feedback control system. According to the device and the method, the magnetic biological effect is thoroughly utilized, and the active sites of proteins in the ammonia monooxygenase and the hydroxylamine oxidase of ammonia-oxidizing bacteria are affected by use of the magnetic field, and therefore, the activity of the enzymes is improved, the ammoxidation reaction rate is increased and the enrichment of the ammonia-oxidizing bacteria is promoted, and especially, the influence of the temperature to the activity of the enzyme can be compensated under a low temperature condition; besides, the speed of movement of charged particles is increased by use of the action of the magnetic field force, and furthermore, the mass transfer efficiency is improved, the defects of unstable operation of the reactor, low ammonia nitrogen degradation rate and the like in existing low-temperature wastewater treatment are made up, and meanwhile, efficient nitrosation is realized in the reactor under the low-temperature condition by controlling dissolved oxygen, pH, hydraulic retention time and sludge age; and as a result, the sewage retention time is shortened and the cost and the energy consumption are reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment, and in particular relates to a device and method for treating low-temperature high-ammonia-nitrogen wastewater by using a constant magnetic field, which is mainly suitable for biologically enhanced treatment of high-ammonia-nitrogen wastewater under low-temperature conditions. Background technique [0002] The massive accumulation of nitrogen in the water environment has led to serious deterioration of the quality of the water environment. Low C / N high ammonia wastewater such as landfill leachate, digested sludge dehydration, and aquaculture wastewater account for more than 50% of the total ammonia nitrogen discharge; traditional biological nitrification The denitrification and denitrification process consumes a lot of oxygen and needs to add a large amount of organic carbon source to achieve a good denitrification effect. In order to achieve low-energy and high-efficiency, re...

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): C02F3/34C02F3/12
CPCY02W10/10
Inventor 许柯梁伟豪任洪强耿金菊丁丽丽
Owner NANJING 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