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Method and application of performing hydrolytic acidification to low-intensity ultrasound pretreated sludge and organic refuse to supply carbon source for promoting bio-denitrification

An ultrasonic pretreatment, organic waste technology, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc. Not properly disposed of and other problems, to achieve significant environmental and economic benefits, reduce operating costs, and reduce sludge production.

Inactive Publication Date: 2012-10-10
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] 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 method and its application for supplementing carbon source by hydrolysis and acidification of sludge and organic waste to promote biological denitrification, and to solve the problem of At present, there are problems of large sludge discharge, improper disposal of organic waste, and high cost of denitrification carbon source

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  • Method and application of performing hydrolytic acidification to low-intensity ultrasound pretreated sludge and organic refuse to supply carbon source for promoting bio-denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 6%Q (Q is the influent flow rate) sludge is concentrated by gravity to a solid content rate of 2.3%, and then transported to 8 probe-type ultrasonic processors for cracking by the sludge pump. The frequency of the ultrasonic reactor is 20kHz, and the diameter of the probe is 20mm, the sound energy density is 0.38kW / m 3 , the cracking time is 3 minutes. After cracking, the TCOD in the sludge liquid phase increased by 2363 mg / L, the activity of the main hydrolase α-glucosidase in the sludge liquid phase increased by 2 times, and the protease activity increased by 3 times compared with that before cracking.

[0019] After degreasing and pulverizing, the mixture of food waste (commonly used for degreasing and crushing in waste treatment) and cracked excess sludge, the solid-to-liquid ratio is 1:15 (mass of organic waste: volume of excess sludge). The two enter the hydrolytic acidification tank for 24 hours of hydrolytic acidification reaction. After the reaction, the VFAs ...

Embodiment 2

[0021] 8%Q (Q is the influent flow rate) sludge is concentrated by gravity to a solid content rate of 2%, and then transported to 4 probe-type ultrasonic processors for cracking through the sludge pump. The frequency of the ultrasonic reactor is 28kHz, and the diameter of the probe is 25mm, the sound energy density is 0.52kW / m 3 , the cracking time is 4min. After cracking, the TCOD in the sludge liquid phase increased by 2546mg / L, the activity of the main hydrolase α-glucosidase in the sludge liquid phase increased by 2.3 times, and the protease activity increased by 3.5 times compared with that before cracking.

[0022] After degreasing and pulverizing, the mixture of food waste (commonly used for degreasing and crushing in waste treatment) and cracked excess sludge, the solid-to-liquid ratio is 1:20 (mass of organic waste: volume of excess sludge). The two enter the hydrolytic acidification tank for 30 hours of hydrolytic acidification reaction. After the reaction, the VFAs...

Embodiment 3

[0024] 10%Q (Q is the influent flow rate) sludge is concentrated by gravity to a solid content rate of 2.5%, and then transported to 6 probe-type ultrasonic processors for cracking by the sludge pump. The frequency of the ultrasonic reactor is 28kHz, and the diameter of the probe is 25mm, the sound energy density is 0.68kW / m 3 , the cracking time is 9 minutes. After cracking, the TCOD in the sludge liquid phase increased by 3078mg / L, the activity of the main hydrolase α-glucosidase in the sludge liquid phase increased by 2.6 times, and the protease activity increased by 3.8 times compared with that before cracking.

[0025] The mixture of crushed vegetable waste (commonly used in waste treatment) and the cracked excess sludge has a solid-to-liquid ratio of 1:25 (mass of organic waste: volume of excess sludge). The two enter the hydrolytic acidification tank for hydrolysis and acidification reaction for 48 hours. After the reaction, the VFAs in the mixed solution can reach 861...

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Abstract

The invention discloses a method and an application of performing hydrolytic acidification to low-intensity ultrasound pretreated sludge and organic refuse to supply carbon source for promoting bio-denitrification. The method comprises the following steps: firstly utilizing low-intensity ultrasound to break the excess sludge, then mixing the pretreated excess sludge and organic refuse to perform hydrolytic acidification, at last refluxing the hydrolytic acidification liquid. The method has the advantages that the method can fully utilize the hydrolase in the excess sludge, improve the hydrolytic acidification effect, solve the problem that the carbon source for performing hydrolytic acidification in the excess sludge is not enough, and fully utilize the carbon source in the excess sludge and organic refuse, without external carbon source, and improve the bio-denitrification efficiency. The method can be used for biotreatment process upgrading transformation of anaerobic-hypoxia-aerobic or hypoxia-aerobic sewage treatment plant, improve the bio-denitrification efficiency, reduce yield of sludge, and realize recycling of the sludge and the organic refuse.

Description

technical field [0001] The invention belongs to the field of wastewater biological treatment, and more specifically, mainly relates to a method and application of low-intensity ultrasonic cracking sludge and organic waste hydrolysis acidification supplementing carbon source to promote biological denitrification and sludge reduction. 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 denitrifi...

Claims

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Application Information

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IPC IPC(8): C02F3/30C02F11/00
Inventor 王芬季民姜晓刚
Owner TIANJIN UNIV
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