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Method for improving sludge dewatering performance by combining bioleaching and dual conditioners

A technology of biological leaching and sludge dewatering, which is applied in the direction of dehydration/drying/concentrated sludge treatment, etc., can solve the problems of expensive treatment costs, achieve the effects of reduced sludge volume, improved treatment efficiency, and simple process

Inactive Publication Date: 2010-10-20
BEIJING FORESTRY UNIVERSITY
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  • Summary
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  • Claims
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Problems solved by technology

The traditional acid conditioning sludge can improve the dewatering performance of the sludge to a certain extent, but due to the addition of inorganic acid (such as sulfuric acid), the treatment cost is relatively expensive

Method used

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  • Method for improving sludge dewatering performance by combining bioleaching and dual conditioners
  • Method for improving sludge dewatering performance by combining bioleaching and dual conditioners

Examples

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Embodiment 1

[0019] 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 pH of the sludge is 6.8, the total solid content of the sludge is 12450mg / L, the volatile solid content is 9280mg / L, and the specific resistance of the sludge is 5.45 ×10 10 the s 2 / g, filter cake moisture content (under 0.03Mpa vacuum filtration condition), 92.5%. Please refer to the specific steps figure 1 :

[0020] (1) Sludge bioleaching inoculum cultivation: put 100ml of sludge with a water content of 98.73% into a 250ml Erlenmeyer flask, and add sulfur powder and FeSO at 10 and 20g / L 4 ·7H 2 O, as an energy source for leaching 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 than 2, absorb 10ml ...

Embodiment 2

[0025] This process is used to treat the sludge in a pilot test. The treated sludge is A 2 / O process for the remaining sludge after treating urban domestic sewage, the sludge pH is 7.15, the total solid content is 18465mg / L, the volatile solid content is 13256mg / L, and the sludge specific resistance is 7.23×10 10 the s 2 / g, filter cake water content (0.03Mpa vacuum filtration), 91.5%. Please refer to the specific steps figure 1 :

[0026] (1) Sludge bioleaching inoculum culture: In 5L sludge with a water content of 98.2%, add sulfur powder and FeSO at 10 and 20g / L respectively 4 ·7H 2 O is used as an energy source for leaching bacteria, air is blown from the bottom of the reactor at 0.5 L / (min·L sludge), and the acclimatized sludge is cultivated at room temperature (25°C) and 180 r / min under agitation until the sludge The pH drops below 2.0. Take the cultivated and domesticated leaching sludge, inoculate it into 5L sludge with a water content of 98.2% at a volume rati...

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Abstract

The invention relates to a method for improving sludge dewatering performance by combining bioleaching and dual conditioners, and belongs to the technical field of sludge treatment. The method comprises the following steps of: under the condition of adding sufficient substrates, culturing and domesticating autochthonous bacteria in sludge, and using the autochthonous bacteria as inoculum; adding the inoculums into the residual sludge, and performing bioleaching on the sludge under the conditions of aerob, stirring and proper substrate until the pH of the sludge is about 2; adding saturated NaOH solution into the leached sludge to adjust the pH of the sludge to between 6 and 7; adding aluminium polychlorid and polyacrylamide into the sludge to condition the sludge; and performing mechanical dewatering on the treated sludge by a plate-and-frame filter pressing or centrifugal dewatering method to obtain the dewatered sludge with the moisture content between 65 and 75 percent. The bio-acidification and the dual conditioners are combined to improve the sludge dewatering performance, so the reaction efficiency can be improved, the reaction time can be shortened, the treatment capacity can be improved, and the sludge treatment cost can be reduced.

Description

technical field [0001] The invention belongs to the technical field of excess sludge treatment, and adopts biological leaching and dual conditioners to jointly improve the dehydration performance of excess sludge and lay 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. The activated sludge method is widely used in urban sewage treatment plants, and its operation produces a large amount of excess sludge. The cost of excess sludge treatment is expensive, accounting for about 25-50% of the entire sewage treatment cost, which brings enormous pressure to the normal operation of sewage treatment plants. The excess sludge has a high m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 张盼月张光明孙世昌刘昌庚
Owner BEIJING FORESTRY UNIVERSITY
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