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
View PDF6 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 very low. The aeration volume must be increased, which increases the power consumption and operating cost of the bioleaching process.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multistage bioleaching reactor process and equipment for sludge treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Three-stage bioleaching is used to process 35 tons of municipal sludge every day

[0025] According to the process and equipment mentioned in the present invention, a set of small-scale system for bioleaching treatment of municipal sludge has been established. The three-stage bioleaching reactor is cylindrical, all made of glass fiber reinforced plastics, 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 flow aerator is installed inside, each with a power of 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 conical, with a cylindrical diameter of 2.2 meters and a total height of 5.0 meters. A small box-type filter press is used, with a filtration area of ​​30m 2 . The system can process 35 tons of municipal sludge with a water content of 97% per day, and the chromium content of the original sludge ...

Embodiment 2

[0026] Example 2: Using four-stage bioleaching to process 200 tons of municipal sludge every day

[0027] According to the process and equipment mentioned in the present invention, a reinforced concrete pool is built by combining the four-stage leaching reactor and the sludge thickening tank, which is divided into five compartments. The first four grids are four-stage bioleaching tanks, each grid has an effective volume of 200m 2 , the sludge flows through the first, second, third, and fourth compartments in sequence, and a centrifugal diffuse aerator with a power of 11 kW is installed in the first and second compartments respectively, and the third and fourth compartments A centrifugal diffuse aerator with a power of 7.5 kilowatts is installed in each grid. The fifth cell is the sludge thickening tank with an effective volume of 130m 3 , with 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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C02F11/02
CPCY02W10/20
Inventor 王树岩
Owner 王树岩
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap