A method of sludge granulation

A technology of sludge granulation and inoculation of sludge, applied in anaerobic digestion treatment and other directions, can solve the problems of easy loss of chemicals, long time, difference in density between crystal nucleus and original sludge, etc., to speed up granulation and strengthen cohesion. force, and the effect of reducing the loss of granulation nuclei

Active Publication Date: 2022-05-27
知和环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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] Using the reactor to cultivate denitrified particle sludge, wherein 1 # as a control group directly added crushed particle sludge for granular culture, 2 # using the method of the present invention to pretreat the sludge, adding zero valent iron and polymeric ferric sulfate to improve the density of inoculated sludge, sludge concentration of 4000 mg / L, crystal nucleus sludge concentration of 200 mg / L, inlet water for municipal sedimentation tank wastewater, nitrate nitrogen content of 10-15 mg / L, inlet water COD for sodium acetate and methanol compound carbon source, about 40-60 mg / L, The upflow rate of the 1# reactor is 3m / h, and the upflow rate of the 2# reactor is 5m / h as the reactor runs, gradually increasing to 10 m / h. During the operation, the No. 1 reactor had the phenomenon of flocculent sludge loss and granulation crystal nucleus deposition, and the operation effect of the 2# reactor was significantly better than that of the 1# reactor, and after the comple...

Embodiment 2

[0031]Using this reactor to cultivate anaerobic particle sludge, wherein 1# as a control group directly added crushed granular sludge for granular culture, 2# using the method of the present invention to pretreat the sludge, the use of calcium chloride and sodium carbonate and polyaluminum chloride to increase the density of sludge, inoculation sludge concentration of 9000 mg / L, crystal nucleus sludge concentration of 2000 mg / L, inlet water for starch wastewater, inlet water COD of about 9000mg / L± 1000mg / L, 1 # reactor upflow rate of 3m / h, 2 #反应器上升流速5m / h, both reactor loads are increased to 8-10 m / h as granulation progresses. In the early stage of the 1# reactor, there was sludge loss and the delamination phenomenon of crystal nucleus and inoculation sludge, and the sludge of the 2# reactor was significantly better than that of the 1# reactor in terms of sedimentation performance and granulation. The specific operating data are shown in Table 2.

[0032] Table 2 Operatio...

Embodiment 3

[0035] Using this reactor to cultivate denitrified granular sludge, wherein 1 # as a control group directly added crushed granular sludge for granular culture, 2 # using the method of the present invention to pretreat the sludge, the use of calcium chloride and sodium carbonate and polyaluminum chloride to increase the density of sludge, sludge concentration of 9000 mg / L, crystal nucleus sludge concentration of 500 mg / L, inlet water for adipic acid production wastewater, nitrate nitrogen content of 800-1200 mg / L, nitrosinous nitrogen concentration of 50 ~ 150 mg / L, The inlet water COD is 800-1000 mg / L, using sodium acetate and methanol compound carbon source, so that C / N = 4, the upflow rate of the 1# reactor is 3 m / h, and the upflow rate of the 2# reactor is 5m / h with the operation of the reactor, which is gradually increased to 10 m / h. During the operation, the upflow rate of a large amount of flocculent sludge loss in Reactor 1 dropped to 1.5 m / h, and the operation effe...

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Abstract

The invention specifically relates to a sludge granulation method. The main method is to add broken granular sludge as a granulation nucleus, and add high-density substances to the inoculated sludge to increase the specific gravity of the inoculated sludge, and by adding The method of flocculant and PAM improves the retention capacity of the added substances in the sludge, maintains the same specific gravity of the inoculated sludge and the granulation nucleus, and uses a specific reactor to provide appropriate hydraulic shear force to shorten the time for the formation of granular sludge.

Description

Technical field [0001] The present invention belongs to the field of water treatment applications, specifically relates to a method of accelerating sludge granulation, the main method is to add the crushed granular sludge as a granulation nucleus, and add a high-density substance to the inoculation sludge to increase the proportion of inoculated sludge, and by adding flocculants and PAM to improve the retention capacity of the sludge added to the sludge, maintain the proportion of inoculated sludge for a long time and granulated nucleus is the same, and the use of a specific reactor to provide suitable hydraulic shear force, shorten the time of particle sludge formation. Background [0002] Since the birth of the activated sludge method, it has been more and more widely used in sewage treatment. With the gradual increase in land costs, people are increasingly eager to demand for reactors with high loads and small footprints. And the emergence of sludge granulation technology has ...

Claims

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Application Information

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Patent Type & Authority Patents(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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