Sludge granulation method

A technology of sludge granulation and inoculation of sludge, applied in anaerobic digestion treatment, etc., can solve problems such as long time, easy loss of chemicals, difference in density between crystal nuclei and original sludge, etc., to strengthen cohesion and accelerate granulation speed, reducing the loss of granulation nuclei

Active Publication Date: 2021-09-17
知和环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the problems of long sludge granulation time, density difference between the added crystal nuclei and the original sludge, and easy loss of dosing agents, combined with the above background technology, the present invention provides A method of sludge granulation

Method used

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Effect test

Embodiment 1

[0027] Use this reactor to cultivate denitrification granular sludge, wherein 1# is used as a control group to directly add broken granular sludge for granulation cultivation, and 2# uses the method of the present invention to pretreat the sludge, adding zero-valent iron and polyferric sulfate Increase the inoculated sludge density, the sludge concentration is 4000 mg / L, the crystal nucleus sludge concentration is 200 mg / L, the influent is municipal secondary sedimentation tank wastewater, the nitrate nitrogen content is 10-15 mg / L, and the influent COD The compound carbon source is sodium acetate and methanol, about 40-60 mg / L, the rising flow rate of 1# reactor is 3m / h, and the rising flow rate of 2# reactor is 5m / h. With the operation of the reactor, it will gradually increase to 10 m / h h. During the operation, the No. 1 reactor had the phenomenon of flocculent sludge loss and particle granulation nuclei deposition, and the operation effect of the 2# reactor was obviously b...

Embodiment 2

[0031] Use this reactor to cultivate anaerobic granular sludge, wherein 1# directly adds crushed granular sludge as a control group and carries out granulated cultivation, and 2# utilizes the method of the present invention to carry out pretreatment to sludge, using calcium chloride and sodium carbonate and Polyaluminum chloride increases the sludge density, the inoculated sludge concentration is 9000 mg / L, the crystal nucleus sludge concentration is 2000 mg / L, the influent is starch wastewater, and the influent COD is about 9000mg / L±1000mg / L, 1 The rising flow rate of #reactor is 3m / h, and the rising flow rate of 2# reactor is 5m / h. With the progress of granulation, the loads of both reactors are increased to 8-10 m / h. In the early stage of 1# reactor, there were sludge loss phenomenon and stratification phenomenon of crystal nuclei and inoculated sludge, and the sedimentation performance and granulation degree of 2# reactor sludge were obviously better than those of 1# reacto...

Embodiment 3

[0035]Use this reactor to cultivate denitrification granular sludge, wherein 1# is used as a control group to directly add broken granular sludge for granulation cultivation, and 2# utilizes the method of the present invention to pretreat the sludge, using calcium chloride and sodium carbonate and Polyaluminum chloride increases the sludge density, the sludge concentration is 9000 mg / L, the crystal nucleus sludge concentration is 500 mg / L, the influent is oxalic acid production wastewater, and the nitrate nitrogen content is 800-1200 mg / L. The concentration of nitrite nitrogen is 50~150mg / L, the influent COD is 800-1000 mg / L, and the carbon source is compounded with sodium acetate and methanol to make C / N=4, and the rising flow rate of 1# reactor is 3 m / h, the rising flow rate of 2# reactor is 5m / h, and gradually increases to 10m / h as the reactor runs. During the operation, a large amount of flocculent sludge was lost in the No. 1 reactor, and the rising flow rate dropped to ...

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Abstract

The invention particularly relates to a sludge granulation method. According to the method, crushed granular sludge as a granulation crystal nucleus is added, a high-density substance is added into inoculated sludge to increase the specific gravity of the inoculated sludge, and a flocculant and PAM (polyacrylamide) are added to improve the retention capacity of the added substance in the sludge, the specific gravity of the inoculated sludge is maintained to be the same with that of the granulation crystal nucleus, and a specific reactor is utilized to provide proper hydraulic shear force, so that the formation time of the granular sludge is shortened.

Description

technical field [0001] The invention belongs to the field of water treatment applications, and specifically relates to a method for accelerating sludge granulation. The main method is to add broken granular sludge as a granulation nucleus, and add high-density substances to the inoculation sludge to increase the inoculation sludge. The specific gravity of the sludge, and the retention capacity of the added substances in the sludge can be improved by adding flocculants and PAM, and the specific gravity of the inoculated sludge can be kept the same as that of the granulation nucleus for a long time, and a specific reactor can be used to provide suitable hydraulic shear force , to shorten the time for the formation of granular sludge. Background technique [0002] Since the birth of the activated sludge method, it has been more and more widely used in sewage treatment. With the gradual increase of land cost, the demand for reactors with high load and small footprint is becomin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28
CPCC02F3/28
Inventor 李海松阎登科田敏慧刘志强王丹丹阎航非
Owner 知和环保科技有限公司
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