Hydrolytic acidification-catalyzed iron/anaerobic-aerobic biological dephosphorization coupling process

A hydrolytic acidification, aerobic biological technology, applied in anaerobic digestion treatment, water/sewage multi-stage treatment, biological water/sewage treatment, etc., can solve problems such as increased salinity, large drop in pH value, unfavorable nitrification reaction, etc. , to achieve the effect of improving stability and efficiency, high phosphorus content in sediment, and improving phosphorus removal efficiency

Active Publication Date: 2014-03-26
相出净流智能科技(上海)有限公司
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the biological phosphorus removal process has the above advantages, the limitations of this method are also prominent: (1) The anaerobic section and the aerobic section must be set up in the phosphorus removal process to meet the physiological requirements of phosphorus-accumulating bacteria and maintain the advantages of phosphorus-removing bacteria. Bacteria need to absorb a large amount of low molecular weight organic acids in the anaerobic stage
The sewage treatment plants with the task of phosphorus removal often also have the task of denitrification, and the biological denitrification method is almost the only choice. The denitrification section of the biological denitrification needs to consume a large amount of easily biodegradable organic matter (including low molecular weight organic acids). Therefore, there is a contradiction between biological phosphorus removal and nitrogen removal competing for carbon sources, and this contradiction is particularly prominent in the treatment of southern urban sewage
(2) There is another contradiction between biological phosphorus removal and nitrogen removal: different sludge age requirements
Although this contradiction can be alleviated by adding biological fillers and other methods, it increases investment and operating costs
(3) Poor stability of biological phosphorus removal
The limitations of the method are: (1) It is necessary to increase the chemical agent dosing unit, which increases the investment and treatment costs, and increases the treatment process; It is not conducive to nitrification reaction; (3) Adding chemical agents increases the salinity in water, which is not conducive to biochemical reactions
Although the method of chemical precipitation and phosphorus removal after biochemical reaction does not cause problems (2) and (3), it affects the water quality and natural deep purification of the water body.

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
  • Hydrolytic acidification-catalyzed iron/anaerobic-aerobic biological dephosphorization coupling process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Phosphorus removal from urban sewage with low organic acid content

[0025] Due to the short urban pipe network and low temperature, hydrolysis and acidification cannot be carried out in the pipe network of sewage in a certain city, and the VFA (volatile organic acid) content of the influent is about 2 mmol / L. Influent BOD 5 The phosphorus content is 150 mg / L, the phosphorus content is 10 mg / L, and the pH value is 7.0. The original A / O biological phosphorus removal process parameters are: hydraulic retention time A section 3 hours, O section 6 hours, after treatment effluent: BOD 5 is 9 mg / L, and the phosphorus content is 3 mg / L.

[0026] Pre-hydrolysis acidification process, hydraulic retention time is 2 hours, upflow, fixed biological packing bed. Catalytic iron filler is placed in section A, with a bulk density of 100kg / M 3 .

[0027] The treatment effect of the new process: the organic acid content in the A section is increased to 10 mmol / L, the ORP (...

Embodiment 2

[0028] Example 2 Phosphorus removal from urban sewage with intermediate organic acid content

[0029] In the sewage of a certain city, the content of volatile organic acids in the influent is in the middle, and the VFA is about 8 mmol / L. Influent BOD 5 The phosphorus content is 150 mg / L, the phosphorus content is 6 mg / L, and the pH value is 7.0. The original A / O biological phosphorus removal process parameters are: hydraulic retention time A section 3 hours, O section 6 hours, after treatment effluent: BOD 5 is 9 mg / L, and the phosphorus content is 2 mg / L.

[0030] Pre-hydrolysis acidification process, hydraulic retention time is 2 hours, upflow, fixed biological packing bed. Catalytic iron filler is placed in section A, with a bulk density of 100kg / M 3 .

[0031] The treatment effect of the new process: the content of organic acid in section A is increased to 12 mmol / L, the ORP (oxidation-reduction potential) is reduced from +50 mV without catalytic iron to -80 mV after ...

Embodiment 3

[0032] Example 3 Phosphorus removal from urban sewage with high organic acid content

[0033] Due to the long urban pipe network and high temperature, hydrolytic acidification has been carried out in the sewage pipe network in a certain city, and the VFA (volatile organic acid) content of the influent is about 15 mmol / L. Influent BOD 5 The phosphorus content is 150 mg / L, the phosphorus content is 10 mg / L, and the pH value is 6.9. The original A / O biological phosphorus removal process parameters are: hydraulic retention time A section 3 hours, O section 6 hours, after treatment effluent: BOD 5 is 8 mg / L, and the phosphorus content is 1.5 mg / L.

[0034] Pre-hydrolysis acidification process, hydraulic retention time is 2 hours, upflow, fixed biological packing bed. Catalytic iron filler is placed in section A, with a bulk density of 100kg / M 3 .

[0035] The treatment effect of the new process: the content of organic acid in section A is increased to 15 mmol / L, the ORP (oxida...

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
densityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a hydrolytic acidification-catalyzed iron / anaerobic-aerobic biological dephosphorization coupling process which is realized by a hydrolytic acidification-catalyzed iron / anaerobic-aerobic biological dephosphorization coupling device. The device is composed of a hydrolytic acidification tank, an anaerobic tank and a catalyzed iron filler therein, an aerobic tank and a precipitation tank which are sequentially connected. The process specifically comprises the following steps: sewage is fed into the hydrolytic acidification tank, and the hydraulic retention time is controlled to be 2-6 hours; the effluent water after hydrolytic acidification reaction is fed into the anaerobic tank, sludge in the anaerobic tank is refluxed by the aerobic tank, the reflux liquid brings dissolved oxygen to destroy the anaerobic phosphorus release environment of phosphorus-accumulating bacteria, and the catalyzed iron can effectively remove the dissolved oxygen and simultaneously form ferrous ions; the effluent water of the anaerobic tank passes through the aerobic tank, and the ferrous ions are oxidized to become ferric ions and be combined with phosphate ions to form precipitates, thus achieving dephosphorization effect; and the effluent water of the aerobic tank is precipitated in the precipitation tank, the effluent water is discharged, and part of sludge is refluxed to the anaerobic tank. The process provided by the invention greatly makes up the limitation of the current biological dephosphorization process, and has favorable application prospects.

Description

technical field [0001] The invention relates to the field of water pollution control engineering, in particular to a phosphorus removal process coupled with biological and physical and chemical methods, in particular to a hydrolytic acidification-catalyzed iron / anaerobic-aerobic biological phosphorus removal coupling process. Background technique [0002] With the development of society and the improvement of people's living standards, the eutrophication of water bodies has attracted more and more attention. The total phosphorus index in the discharge standards of sewage treatment plants has become more and more stringent. Phosphorus and nitrogen have become the main tasks and objectives of upgrading urban sewage treatment plants. Technical Difficulties. [0003] Phosphorus removal in urban sewage treatment plants mostly adopts biological phosphorus removal methods. The advantages are: no need to add chemicals and low cost; biological methods can reduce various pollution ind...

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): C02F3/28C02F3/34C02F9/14
Inventor 马鲁铭刘飞萍刘钰马捷汀王浩梁学颖宋梦琪
Owner 相出净流智能科技(上海)有限公司
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