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Device and method for improving biological dephosphorizing and denitriding efficiency of low carbon source sewage

A sewage biological and carbon source technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, sludge treatment, etc. The effect of reducing and harmless, reducing the initial investment

Inactive Publication Date: 2011-05-18
TIANJIN URBAN CONSTR COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a device and treatment method for improving the efficiency of biological phosphorus and nitrogen removal of low-carbon source sewage, which is beneficial to solve the problem of insufficient organic carbon sources and difficulties in the treatment of excess sludge during biological phosphorus and nitrogen removal in urban sewage treatment plants. Problems, realize the recycling of organic carbon sources in excess sludge, and effectively reduce the cost of adding additional organic carbon sources during biological phosphorus and nitrogen removal in urban sewage treatment plants

Method used

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  • Device and method for improving biological dephosphorizing and denitriding efficiency of low carbon source sewage
  • Device and method for improving biological dephosphorizing and denitriding efficiency of low carbon source sewage
  • Device and method for improving biological dephosphorizing and denitriding efficiency of low carbon source sewage

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Experimental program
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Effect test

Embodiment 1

[0029] Such as figure 1 As shown, the system consists of anaerobic-anoxia-aerobic reaction tank A with the function of dephosphorization and denitrification 2 O biological reaction tank 1, sewage sedimentation tank 2, sludge mechanical thickening device 3, namely centrifugal thickener, pressure sludge microwave alkaline hydrolysis treatment device 4 and magnesium ammonium phosphate reaction sedimentation tank 5.

[0030] 1. Excess sludge thickening

[0031] Add a liquid polymer flocculant—polyamidine to the remaining sludge with a solid content of 0.7% from the sewage sedimentation tank 2, and the mass ratio of the total solid TS in the flocculant to the remaining sludge is 1:1000 Under the conditions, the solid content of the remaining sludge becomes 4.5% after being concentrated by the centrifugal thickener, and the concentrated sludge enters the pressure-bearing sludge microwave alkaline hydrolysis treatment device 4.

[0032] 2. Microwave alkaline hydrolysis of concentrated sludg...

Embodiment 2

[0044] The composition of the low-carbon source sewage 6 is the same as in Example 1, that is, the COD in the low-carbon source sewage 6 is 200 mg / L, TN is 50 mg / L, TP is 6 mg / L, and BOD:TN2 O Treatment of biological reaction tank 1 and sewage sedimentation tank 2, A 2 The process parameters of the biological reaction tank 1 and the sewage sedimentation tank 2 are the same as those in Example 1. The water quality of the effluent 9 from the sewage sedimentation tank did not meet the first level B standard of the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB 18918-2002).

Embodiment 3

[0046] Such as figure 2 As shown, the system consists of an SBR tank 14, a sludge mechanical thickening device 3, that is, a centrifugal thickener, a pressure sludge microwave alkaline hydrolysis treatment device 4, and a magnesium ammonium phosphate reaction sedimentation tank 5.

[0047] 1. Excess sludge thickening

[0048] Add a liquid polymer flocculant—polyamidine to the remaining sludge with a solid content of 0.7% from the SBR biological reaction tank 14, and the mass ratio of the total solid TS in the flocculant to the remaining sludge is 1:1000 Under the conditions, the solid content of the remaining sludge becomes 4.5% after being concentrated by the centrifugal thickener, and the concentrated sludge enters the pressure sludge microwave alkaline hydrolysis treatment device 4.

[0049] 2. Microwave alkaline hydrolysis of concentrated sludge

[0050] Add 20M NaOH solution to the concentrated sludge with a solid content of 4.5% from the centrifugal thickener in the mixing tan...

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Abstract

The invention provides a device and a method for improving the biological dephosphorizing and denitriding efficiency of low carbon source sewage, belonging to the technical fields of sewage treatment and residual sludge treatment. The method comprises the following steps of: under the microwave alkaline hydrolysis condition, hydrolyzing solid organic matters in the residual sludge into soluble organic matters; recovering and hydrolyzing nitrogen and phosphor in supernate by adopting a magnesium ammonium phosphate setting method; and adding the hydrolyzed supernate subjected to dephosphorizing and denitriding treatment in the low carbon source sewage and carrying out biological dephosphorizing and denitriding treatment on the hydrolyzed supernate so as to improve the biological dephosphorizing and denitriding efficiency of the low carbon source sewage. According to the invention, by carrying out the microwave alkaline hydrolysis treatment on the residual sludge to produce high-concentration soluble organic matters easy to biodegrade, the product can be used as a low-price carbon source subjected to biological dephosphorizing and denitriding treatment in the lower carbon source sewage, and the biological dephosphorizing and denitriding efficiency in the lower carbon source sewage can be improved; meanwhile, sludge minimization, reclamation and harmlessness can be realized. The VSS (Volatile Suspended Solids) solubility in the sludge can be improved to 82 percent, so that the effluent quality of the low carbon source sewage treated by the device and the method achieves the first-class B standard 'Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant' (GB18918-2002).

Description

Technical field [0001] The invention belongs to a sewage and surplus sludge treatment method, in particular to a device and a treatment method for improving the biological phosphorus and nitrogen removal efficiency of low-carbon source sewage. Background technique [0002] With the increasing eutrophication of the water environment, my country has increasingly strict requirements on the concentration of total nitrogen (TN) and total phosphorus (TP) in the effluent from urban sewage treatment plants. In the biological treatment process of urban sewage, biological nitrogen and phosphorus removal processes require a large amount of carbon sources. [0003] For most sewage treatment plants, the carbon source in the influent water is the limiting factor for biological phosphorus and nitrogen removal. For example, after the completion of many urban sewage treatment plants in my country, the COD concentration in influent water is generally low, while the content of TN and TP is relativel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/00C02F11/12
Inventor 池勇志李玉友费学宁苑宏英王少坡
Owner TIANJIN URBAN CONSTR COLLEGE
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