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Method for hydrolyzing and acidifying residual sludge and organic wastes and supplementing carbon sources to promote biological nitrogen removal and application thereof

A technology for organic waste, hydrolysis and acidification, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc. Proper disposal and other issues to achieve the effect of reducing operating costs, significant environmental and economic benefits, and reducing sludge production

Inactive Publication Date: 2012-10-10
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the problem of insufficient carbon source in excess sludge, the present invention provides a new method for supplementing carbon source through hydrolysis and acidification of excess sludge and organic waste to promote biological denitrification, solving the current Large amount of sludge discharge, improper disposal of organic waste, high cost of denitrification carbon source

Method used

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  • Method for hydrolyzing and acidifying residual sludge and organic wastes and supplementing carbon sources to promote biological nitrogen removal and application thereof

Examples

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Effect test

Embodiment 1

[0018] After degreasing and pulverizing, the mixture of kitchen waste (commonly used for degreasing and crushing in waste treatment) and excess sludge, the solid-to-liquid ratio is 1:15 (mass of organic waste: volume of excess sludge), and the amount of excess sludge is 5% of the incoming water flow. The two enter the hydrolytic acidification tank for hydrolytic acidification reaction for 24 hours. After the reaction, the VFAs in the mixed solution can reach 4825mg / L (90% of which is acetic acid). The hydraulic retention time of the oxygen pool is 2h. The whole process runs continuously for 3 months in summer, and the denitrification effect is stable. The monitoring data found that the influent chemical oxygen demand (COD) is 100-200mg / L, the total nitrogen (TN) is 40-50mg / L, the secondary sedimentation tank effluent COD50-60mg / L, TN8-12mg / L, and the effluent reaches the first grade A standard (GB18918-2002), and reduce the amount of residual sludge discharge, to achieve slu...

Embodiment 2

[0020] After degreasing and crushing, the mixture of kitchen waste (commonly used for degreasing and crushing in waste treatment) and excess sludge, the solid-liquid ratio is 1:20 (mass of organic waste: volume of excess sludge), and the amount of excess sludge is 8% of incoming water flow. The two enter the hydrolytic acidification tank for 30 hours of hydrolytic acidification reaction. After the reaction, the VFAs in the mixed solution can reach 6025mg / L (91% of which is acetic acid). The hydraulic retention time of the oxygen pool is 4h. The whole process runs continuously for 3 months in autumn, and the denitrification effect is stable. The monitoring data found that the influent chemical oxygen demand (COD) is 100-200mg / L, the total nitrogen (TN) is 30-45mg / L, the secondary sedimentation tank effluent COD50-60mg / L, TN10-12mg / L, and the effluent reaches the first grade A standard (GB18918-2002).

Embodiment 3

[0022] Mixture of crushed vegetable waste (commonly used in waste treatment) and excess sludge, solid-liquid ratio of 1:25 (organic waste mass: excess sludge volume), excess sludge volume of 6% of influent flow . The two enter the hydrolytic acidification tank for hydrolytic acidification reaction for 48 hours. After the reaction, the VFAs in the mixed solution can reach 7514mg / L (89% of which is acetic acid). The hydraulic retention time of the oxygen tank is 3h. The whole process runs continuously for 3 months in winter, and the denitrification effect is stable. The monitoring data found that the influent chemical oxygen demand (COD) is 100-200mg / L, the total nitrogen (TN) is 30-45mg / L, the secondary sedimentation tank effluent COD40-50mg / L, TN 10-15mg / L, and the effluent reaches a Class A standard (GB18918-2002).

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Abstract

The invention discloses a method for hydrolyzing and acidifying residual sludge and organic wastes and supplementing carbon sources to promote biological nitrogen removal and an application thereof. The method comprises the following steps of: firstly hydrolyzing and acidifying after the residual sludge is mixed with the organic wastes, then flowing hydrolyzed and acidified mixed liquid backwards to a biological anaerobic pool and supplementing the carbon sources. The method and the application thereof have the advantages that the problem of insufficient hydrolyzed and acidified carbon sources in the residual sludge is solved, the carbon sources in the residual sludge and the organic wastes are fully utilized, no additional carbon source is required, and the biological nitrogen removal efficiency is improved. The method and the application thereof can be applied to the upgrade and the reconstruction of a biological treatment process in an anaerobic-anoxic-aerobic and anoxic-aerobic sewage treatment plant, thereby realizing the recycle of the sludge and the organic wastes.

Description

technical field [0001] The invention belongs to the field of wastewater biological treatment, and more specifically, mainly relates to a method for supplementing carbon sources through hydrolysis and acidification of excess sludge and organic garbage to promote biological denitrification and its application. Background technique [0002] Eutrophication is one of the major water pollution problems facing the world today, and nitrogen and phosphorus are the main factors causing eutrophication in water bodies. With the improvement of public environmental awareness and the increasingly stringent standards for nitrogen and phosphorus discharge restrictions at home and abroad. Biological denitrification technology is currently the most widely used sewage denitrification technology, that is, nitrogen removal is achieved through the action of nitrifying bacteria and denitrifying bacteria. Sufficient carbon sources are the key to achieving efficient denitrification. It is generally ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30B09B3/00C02F101/16
Inventor 王芬季民姜晓刚
Owner TIANJIN UNIV
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