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A method for cracking sludge by utilizing singlet oxygen

A singlet oxygen and sludge technology, applied in the oxidation treatment of sludge, sludge treatment, chemical instruments and methods, etc., can solve the problems of occupying a large amount of land, ecological damage, waste of available sludge resources, etc., and achieve moderate prices. , The effect of improving dehydration performance and non-toxic side effects

Active Publication Date: 2017-07-28
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The random stacking and discharge of untreated sludge will occupy a large amount of land, cause serious damage to the nearby ecology, and waste the available resources in the sludge

Method used

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  • A method for cracking sludge by utilizing singlet oxygen
  • A method for cracking sludge by utilizing singlet oxygen
  • A method for cracking sludge by utilizing singlet oxygen

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Experimental program
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Effect test

specific Embodiment approach 1

[0022] Specific embodiment one: a kind of method utilizing singlet oxygen of the present invention to crack sludge is realized through the following steps:

[0023] 1. Add the catalyst and oxidant to the sludge to be decomposed at a molar ratio of 1:(1~10), control the concentration of peroxide in the sludge to 1000~10000mg / L, and the reaction time is 30~ 120min, keep stirring during the process;

[0024] 2. Thicken the cracked sludge, and then return the supernatant to the aeration tank;

[0025] 3. Perform sludge dehydration or anaerobic digestion treatment on the remaining sludge after the concentrated treatment in the previous step, that is, complete the use of singlet oxygen to crack the sludge; wherein the catalyst is pyruvic acid, and the oxidant for peroxides.

[0026] The principle of a method for utilizing singlet oxygen to decompose sludge in this embodiment is as follows: first, pyruvic acid catalyzes peroxide (permonosulfate, percarbonate) to produce a diepoxy i...

specific Embodiment approach 2

[0028] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the peroxide is a mixture of one or more of persulfate and percarbonate in any ratio. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the persulfate is sodium persulfate (NaHSO 5 ), potassium persulfate (KHSO 5 ), ammonium persulfate (NH 4 HSO 5 ), calcium persulfate (Ca(HSO 5 ) 2 ), magnesium persulfate (Mg(HSO 5 ) 2 ) in one or several mixtures in any ratio. Others are the same as in the first embodiment.

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Abstract

The invention provides a method for cracking sludge by virtue of singlet oxygen and relates to a sludge cracking method. The method comprises the steps of adding a catalyst pyroracemic acid and antioxidants peroxides (peroxymonosulfate and percarbonate) into to-be-cracked sludge, stirring to react, pumping supernate of the cracked sludge back into an aeration tank, and carrying out treatments including dehydration and the like on the residual sludge. According to the method, a bisepoxy intermediate is generated by catalyzing peroxides by virtue of pyroracemic acid and further reacts with peroxides to generate singlet oxygen and pyroracemic acid, peroxides are continuously catalyzed by generated pyroracemic acid, and generated pyroracemic acid plays a role of circular catalysis during reaction, generated high-activity singlet oxygen is capable of damaging the structure of sludge floc and releasing bound water, improving the dehydration performance of sludge and damaging the cell structures of microorganisms. The method has the characteristics that the sludge treatment effect is good, toxic and harmful products are not generated, a required carbon source is provided for sewage treatment, and the catalyst pyroracemic acid and the antioxidants peroxides are environmentally friendly and safe and have no toxic and side effects.

Description

technical field [0001] The invention relates to a method for cracking sludge, in particular to a method for cracking sludge by using singlet oxygen. Background technique [0002] Sludge is a by-product of the biological process of sewage treatment. It is composed of a large number of microbial populations and the bacterial micelles formed by inorganic and organic substances attached to it, including refractory organic substances, heavy metals and salts, and less It also contains pathogenic microorganisms and parasite eggs, and the composition is very complex. At the same time, the sludge has a high water content and a large volume, which requires dehydration treatment. Random stacking and discharge of untreated sludge will occupy a large amount of land, cause serious damage to the nearby ecology, and waste the available resources in the sludge. Therefore, how to treat and dispose of sludge economically and effectively has become an issue of widespread concern. [0003] si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/06
Inventor 江进李娟高源周扬庞素艳
Owner HARBIN INST OF TECH
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