Multistage bioleaching reactor process and equipment for sludge treatment

A biological leaching and reactor technology, which is applied in the field of environmental engineering, can solve the problems of increased power consumption, increased operating costs, and increased aeration volume in the biological leaching process, so as to improve oxygen transfer efficiency and improve oxygenation capacity. , the effect of improving the efficiency of dissolved oxygen

Inactive Publication Date: 2013-10-30
王树岩
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Problems solved by technology

The concentration of sludge in the bioleaching reactor is very high, and the oxygenation efficiency of the blast aeration method is

Method used

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  • Multistage bioleaching reactor process and equipment for sludge treatment

Examples

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Example Embodiment

[0024] Example 1: Using three-stage biological leaching to process 35 tons of municipal sludge per day

[0025] According to the process and equipment mentioned in the present invention, a set of small-scale biological leaching method for treating municipal sludge is established. The three-stage biological leaching reactor is cylindrical, all made of glass fiber reinforced plastic, with a diameter of 3.8 meters and a height of 4.2 meters. , The water depth is 3.5 meters, and a centrifugal diffuse aerator is installed inside each, the power is 1.1 kilowatts, and the total power is 3.3 kilowatts. The upper part of the sludge thickening tank is cylindrical and the lower part is inverted cone. The cylindrical diameter is 2.2 meters and the total height is 5.0 meters. A small box-type filter press with a filtering area of ​​30m is used 2 . The system can treat 35 tons of municipal sludge with a moisture content of 97% per day. The original sludge has a chromium content of 480mg / kg dr...

Example Embodiment

[0026] Example 2: Using four-stage biological leaching to process 200 tons of municipal sludge per day

[0027] According to the process and equipment mentioned in the present invention, the four-stage leaching reactor and the sludge thickening tank are combined to form a reinforced concrete pool, divided into five grids. The first four compartments are four-stage biological leaching tanks, each with an effective volume of 200m 2 , The sludge flows through the first, second, third, and fourth compartments in sequence. A centrifugal diffuser with a power of 11 kW is installed in the first compartment and the second compartment. The third and fourth compartments A centrifugal diffuser with a power of 7.5 kilowatts is installed in each grid. The fifth box is the sludge thickening tank with an effective volume of 130m 3 , There is a mud bucket at the bottom. Equipped with a filter area of ​​150m 2 Box filter press. The system can process 200 tons of municipal sludge with a moisture...

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Abstract

The invention relates to a multistage bioleaching reactor process and equipment for sludge treatment. The equipment comprises bioleaching reactors of multiple stages, a sludge thickening pool, aeration devices, an internal sludge reflux pump, an external sludge reflux pump, a dewatering pump, a box type press filter and the like. Composite microbial flora mainly comprising acidophilic thiobacillus, acid-resisting heterotrophic bacteria and the like is utilized, sludge is subjected to acidification in the bioleaching reactors of multiple stages under the condition that the composite microbial flora is matched with nutritional substances in an aerobic environment with appropriate temperature, finally, the pH value is decreased to be smaller than 3, heavy metals in the sludge are transferred into an aqueous phase, and mud cakes with moisture content lower than 60% can be obtained through press filtering and dewatering. The aeration devices adopt flow jetting aeration or centrifugal flow diffusing aeration, so that the power consumption is decreased by over 30% compared with that of air blasting aeration. After the sludge is subjected to bioleaching reaction, no more odors are generated, pathogenic microorganisms of over 99% are killed, the dewatering is easy, the moisture content of the mud cakes is lower than 60% in the case of not adding any medicaments, and the amount of the sludge is reduced greatly.

Description

technical field [0001] The invention relates to a method for removing heavy metals from excess sludge produced by municipal and industrial wastewater treatment, improving sludge dewatering performance, and realizing high-quality sludge dehydration, and belongs to the technical field of environmental engineering. Background technique [0002] Excess activated sludge refers to the sediment produced in the process of purifying sewage in sewage treatment plants. It contains a large amount of organic matter, nitrogen and phosphorus and other plant nutrients, and is often enriched with certain heavy metals, which is difficult to use in farmland. Recycling of excess activated sludge is one of the problems that need to be solved in current environmental governance. [0003] At present, sludge disposal methods include many types, such as: landfill, incineration, throwing into the sea, and making construction materials, etc. The agricultural use of sludge is undoubtedly one of the bes...

Claims

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Application Information

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IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 王树岩
Owner 王树岩
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