Method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge

A calcium peroxide, anaerobic digestion technology, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc. It can shorten the digestion time, eliminate the hidden danger of environmental pollution and make it easier to implement.

Active Publication Date: 2014-06-25
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The traditional anaerobic digestion process has the following disadvantages: the sludge residence time is long, which takes 20-30 days, so the facility occupies a large area, the infrastructure cost is hig

Method used

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  • Method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge

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Effect test

Embodiment 1

[0030]The method of the present invention is used to treat the concentrated sludge of a certain sewage treatment plant in Shanghai, operated at normal temperature, the mass ratio of calcium peroxide to excess sludge is 0.3:1, and reacted for 24 hours. The STOC (dissolved organic matter) of the sludge and the release of total nitrogen in the supernatant increased by 99.35% and 264.63% respectively compared with the sludge not treated with calcium peroxide.

Embodiment 2

[0032] The method of the present invention is used to treat the excess sludge of a sewage treatment plant in Shanghai, operated at normal temperature, the mass ratio of calcium peroxide and excess sludge is 0.5:1, and the reaction is 24 hours. The STOC (dissolved organic matter) of the sludge and the release of total nitrogen in the supernatant increased by 439.33% and 298.00% respectively compared with the sludge not treated with calcium peroxide.

Embodiment 3

[0034] The method of the present invention is used to treat the excess sludge of a certain sewage treatment plant in Shanghai, operated at normal temperature, the mass ratio of calcium peroxide to excess sludge is 0.5:1, and reacted for 5 hours. The release of STOC (dissolved organic matter) of the sludge increased by 208.83% compared with the sludge not treated with calcium peroxide.

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Abstract

The invention relates to a method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge, which comprises the following steps: 1)a calcium peroxide processing unit: placing the calcium peroxide in the sludge, wherein the mass ratio of calcium peroxide to sludge is 0.01: 1-0.6:1, reacting for 1-24 hours, and hydrolyzing the sludge; and 2)an anaerobic digestion unit: after processing the calcium peroxide, performing anaerobic digestion on sludge under the effect of anaerobe and amphimicrobe in an anaerobic digestion tank, rapidly using an organic compound in the sludge, conversing to methane, carbon dioxide and water, increasing the sludge biogas output and then realizing the quantitative reduction. Compared with the prior art, the method for promoting hydrolysis of sludge by using calcium peroxide and increasing effect of anaerobic digestion of sludge has the advantages of low cost, shortened digestion time and easy enforcement.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, in particular to a method for using calcium peroxide to promote sludge hydrolysis and improve the effect of sludge anaerobic digestion. Background technique [0002] The biological sewage treatment method based on activated sludge is currently the most widely used sewage biological treatment technology in the world, but this method has always had the disadvantage of producing a large amount of excess sludge. With the increasing amount of sewage and the continuous improvement of sewage treatment rate, my country's sludge production will increase significantly in the next few years. It is estimated that the sewage discharge in 2020 will reach 5.46×10 10 m 3 / d, the amount of dry sludge generated is 45.42 million tons. Although the amount of sludge accounts for only 1-2% of the amount of sewage, the investment in sludge treatment facilities accounts for about 40%-50% of the total investment i...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/04
CPCY02E50/30
Inventor 李咏梅张艾王婕张丽丽
Owner TONGJI UNIV
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