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Biological denitrification promotion method using carbon source supplemented by carrying out low-intensity ultrasonic sludge disintegration and hydrolytic acidification on disintegrated sludge and straws and application of method

A technology of hydrolytic acidification and biological denitrification, which is applied in the fields of chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. To solve the problem of high additional cost of carbon source, to achieve significant environmental and economic benefits, reduce operating costs, and improve the effect of pretreatment

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 sources in excess sludge, the present invention provides a low-intensity ultrasonic cracking sludge and crop straw hydrolysis acidification to supplement carbon sources to promote biological denitrification and sludge The reduction process solves the current problems of large sludge discharge, improper disposal of crop straw, and high additional cost of denitrification carbon source

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  • Biological denitrification promotion method using carbon source supplemented by carrying out low-intensity ultrasonic sludge disintegration and hydrolytic acidification on disintegrated sludge and straws and application of method

Examples

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Effect test

Embodiment 1

[0016] 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 1263mg / 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.

[0017] According to the solid-liquid ratio of 1:15 (mass of straw: the volume of residual sludge after cracking), weigh the corn straw powder that has passed through a 20-mesh sieve after sieving, and fully mix the corn straw powder with the residual sludge after cracking to ensure that the straw is soaked in in the remaining sludge. Treat in straw soaking tank for 2...

Embodiment 2

[0020] 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 0.50kW / m 3 , the cracking time is 4min. After cracking, the TCOD in the sludge liquid phase increased by 1742 mg / 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.

[0021] According to the solid-liquid ratio of 1:20 (mass of straw: volume of residual sludge after cracking), weigh the corn straw powder that has passed through a 30-mesh sieve after sieving, and fully mix the corn straw powder with the residual sludge after cracking to ensure that the straw is soaked in in the remaining sludge. Treat for 48 hours in the straw so...

Embodiment 3

[0024] The sludge with 10%Q (Q is the influent flow rate) is concentrated by gravity to a solid content rate of 2.5%, and then transported by the sludge pump to 6 probe-type ultrasonic processors for cracking. The frequency of the ultrasonic reactor is 30kHz, and the diameter of the probe is 30mm, 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 2327mg / 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] According to the solid-liquid ratio of 1:15 (mass of straw: volume of remaining sludge after cracking), weigh the rice straw powder that has passed through a 40-mesh sieve after sieving, and fully mix the rice straw powder with the remaining sludge to ensure that the straw is soaked in the remaining sludge. in the mud. Treat for 48 hours in the s...

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Abstract

The invention discloses a biological denitrification promotion method using carbon sources supplemented by carrying out low intensity ultrasonic sludge disintegration and hydrolytic acidification on disintegrated sludge and straws and application of the method. The method comprises the following steps of: firstly, disintegrating residual sludge through low intensity ultrasonic; then mixing disintegrated sludge with straws and carrying out hydrolytic acidification; and finally refluxing liquid subjected to hydrolytic acidification. The method has the advantages that crop straws are preprocessed in the way of being soaked in the residual sludge, and hydrolase present in the residual sludge are fully utilized, so that the effect of preprocessing the crop straws is improved, no additional carbon source is required, and the biological denitrification efficiency is enhanced. The method can be applied to upgrading reconstruction of biotreatment techniques of anaerobic-anoxic-aerobic and anoxic-aerobic sludge treatment plants, the biological denitrification efficiency is enhanced, and the reclamation of sludge and crop straws are realized.

Description

technical field [0001] The invention belongs to the field of wastewater biological treatment, and mainly relates to a method for supplementing carbon sources through hydrolysis and acidification of sludge and straw by low-intensity ultrasound 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 believed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F3/28C02F3/34
Inventor 王芬季民姜晓刚
Owner TIANJIN UNIV
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