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Method for improving dewatering performance of excess sludge by combining biological acidification and Fenton-like oxidation

A technology of biological acidification and excess sludge, applied in the direction of oxidation treatment sludge, biological sludge treatment, etc., can solve the problems that affect the actual application, long sludge residence time, high operating cost of sludge treatment, etc., to achieve easy control, The effect of low content of toxic and harmful substances and pathogens and reduced volume

Inactive Publication Date: 2010-06-30
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Sludge Fenton oxidation requires low pH to achieve good results, so it is first necessary to add inorganic acid to acidify the sludge, which makes the sludge treatment operation cost high
However, the sludge residence time in the sludge biological acidification process is long, up to several days or even tens of days, which seriously affects its practical application.

Method used

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  • Method for improving dewatering performance of excess sludge by combining biological acidification and Fenton-like oxidation
  • Method for improving dewatering performance of excess sludge by combining biological acidification and Fenton-like oxidation

Examples

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Effect test

Embodiment 1

[0020] This process is used for batch treatment of sludge in the laboratory. The treated sludge is the residual sludge produced by the oxidation ditch process to treat urban domestic sewage. The main characteristics of the sludge are: pH, 6.83; total solid content, 15461mg / L; volatile solid content, 10248mg / L, sludge specific resistance , 6.45×10 10 the s 2 / g, the moisture content of the filter cake (under the vacuum filtration condition of 0.03Mpa), 91.4%.

[0021] Please refer to the specific steps figure 1 :

[0022] (1) Sludge biological acidification inoculum culture: put 100ml of sludge with a solid content of 1.5% into a 250ml Erlenmeyer flask, add sulfur powder and FeSO at 10 and 20g / L 4 ·7H 2 O, as the energy substance of acidifying bacteria, the Erlenmeyer flask was placed in a constant temperature shaker in a water bath for shaking culture, the temperature was controlled at 28°C, and the shaking speed was 180r / min. When the pH of the sludge system is lower th...

Embodiment 2

[0027] This process is used to expand the pilot scale treatment of sludge. The treated sludge is A 2 The remaining concentrated sludge after treatment of urban domestic sewage by / O process, the sludge characteristics are: pH, 7.05; total solid content, 23485mg / L; volatile solid content, 15689mg / L, sludge specific resistance, 5.16×10 10 the s 2 / g, filter cake water content (0.03Mpa vacuum filtration), 90.5%. Please refer to the specific steps figure 1 :

[0028] (1) Sludge biological acidification inoculum culture: in 5L sludge with a solid content rate of 2.3%, add sulfur powder and FeSO at 10 and 20g / L respectively 4 ·7H 2 O is used as an energy source for acidifying bacteria, and air is blown from the bottom of the reactor at 0.5 L / (min·L sludge), and the domesticated sludge is cultivated at 28 °C and 180 r / min under agitation until the pH of the sludge drops to 2.0 the following. Take the acclimatized acidified sludge, inoculate it into 5L of sludge with a solid co...

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Abstract

The invention relates to a method for improving dewatering performance of excess sludge by combining biological acidification and Fenton-like oxidation, which belongs to the technical field of sludge treatment. The method comprises that: under the condition of adding a sufficient quantity of substrates, indigenous acidification bacteria serving as inoculation liquid are cultured and acclimatized from sludge; the inoculation liquid is added to excess sludge in order to perform biological acidification on the sludge under an aerobic stirring condition in the presence of a sufficient quantity of substrates till the pH of the sludge is 2 to 3; under the catalytic action of Fe2+ and Fe3+, H2O2 produces strong oxidative free radicals and other Fenton-like oxidized sludge; Ca(OH)2 solution is added to the treated sludge to regulate the pH of the sludge to be between 6 and 7; and the treated sludge is dewatered by a plate-frame pressure filtration method or a centrifugal dewatering method in order to obtain dewatered sludge with water content between 65 and 75 percent. The combination of biological acidification and Fenton-like oxidation for improving the dewatering performance of excess sludge can improve reaction efficiency, shorten reaction time, increase treatment capacity and reduce cost for sludge treatment.

Description

technical field [0001] The invention belongs to the technical field of excess sludge treatment, adopts a combined biological acidification-Fenton oxidation technology to improve the dehydration performance of excess sludge, and lays a foundation for subsequent treatment and resource utilization of sludge. Background technique [0002] With the development of the economy and the improvement of people's living standards, most cities in my country have built centralized sewage treatment plants. The operation of sewage treatment plants has played a huge role in improving my country's water environment and protecting human health. In the process of sewage treatment, a large amount of excess sludge is produced, and the sludge production in our country shows a trend of continuous and rapid growth year by year. Excess sludge contains a lot of water, and its water content is generally above 98%, so it has a huge volume; excess sludge also contains bacteria, viruses, adsorbed parasit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C02F11/02
Inventor 张盼月张光明刘昌庚肖凌鹏曾光明
Owner BEIJING FORESTRY UNIVERSITY
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