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A method for combining biological acidification and fenton-like oxidation to improve the dewatering performance of excess sludge

A technology of biological acidification and excess sludge, applied in the oxidation treatment of sludge, biological sludge treatment, etc., can solve the problems of high operating cost of sludge treatment, long sludge residence time, affecting practical application, etc., and achieve toxic and harmful substances. and low pathogen content, reduced volume, and easy control

Inactive Publication Date: 2011-12-14
BEIJING FORESTRY UNIVERSITY
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  • Abstract
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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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  • A method for combining biological acidification and fenton-like oxidation to improve the dewatering performance of excess sludge
  • A method for combining biological acidification and fenton-like oxidation to improve the dewatering performance of excess sludge

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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 the dehydration performance of excess sludge through combined use of biological acidification and Fenton-like oxidation, and belongs to the technical field of sludge treatment. Under the condition of adding a sufficient amount of substrate, the domesticated acidifying bacteria were cultivated from the sludge as the inoculum; the inoculum was added to the remaining sludge, and the sludge was biologically treated under the conditions of aerobic, stirring and appropriate amount of substrate. Acidification until the pH of the sludge is 2-3; under the catalysis of Fe2+ and Fe3+, H2O2 produces strong oxidizing free radicals and other Fenton oxidation sludge; add Ca(OH)2 solution to the treated sludge to adjust The pH of the sludge is 6-7; the treated sludge is dehydrated by means of plate and frame filter press or centrifugal dehydration to obtain dewatered sludge with a water content of 65-75%. Combining biological acidification and Fenton-like oxidation to improve sludge dewatering performance can improve reaction efficiency, shorten reaction time, increase treatment capacity, and reduce sludge treatment costs.

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 Patents(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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