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Method for removing heavy metal in excess activated sludge

A technology for residual activity and heavy metals, applied in biological sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. problem, to achieve the effect of economical feasibility, easy operation, and short removal time.

Inactive Publication Date: 2007-10-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems of the existing technology include: the removal efficiency of heavy metals is not high, the time required for removing heavy metals is long, and the operability is poor

Method used

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  • Method for removing heavy metal in excess activated sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] 1. Experimental equipment

[0015] 1) Reaction barrel

[0016] In this experiment, a 3-liter plexiglass bioreactor was used, with a liquid inlet, a liquid outlet, and a thermometer jack on the top. The reaction barrel was placed in a constant temperature water bath device with magnetic stirring function to ensure constant temperature and temperature during the reaction process. Stir well.

[0017] 2) Outflow and return constant flow pump

[0018] The outflow and backflow cross-flow pump can discharge or add a fixed amount of culture solution within a fixed time, and is used in conjunction with a microcomputer switch to pump a certain amount of reaction solution from the biological reaction tank within a specified time.

[0019] 1.3 microcomputer time control switch

[0020] The time can be preset, and it can be turned on and off at regular intervals to control the biological reaction, the outflow of the reaction solution and the reflux of the acidic bacteria solution...

Embodiment 2

[0036] 1. Experimental equipment

[0037] 1) Biological reaction tank

[0038] This experiment uses a 3-liter plexiglass biological reaction tank with a liquid inlet, a liquid outlet and a thermometer jack on the top. The reaction tank is placed in a constant temperature water bath device with magnetic stirring function to ensure the temperature and stirring during the reaction. .

[0039] 2) Outflow and return constant flow pump

[0040] The outflow and backflow cross-flow pump can discharge or add a fixed amount of culture solution within a fixed time, and is used in conjunction with a microcomputer switch to pump a certain amount of reaction solution from the biological reaction tank within a specified time.

[0041] 3) Microcomputer time control switch

[0042] The time can be preset, and it can be turned on and off at regular intervals to control the biological reaction, the outflow of the reaction solution and the reflux of the acidic bacteria solution, etc. The enti...

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Abstract

This invention discloses method and apparatus for removing heavy metals. The method comprises: inoculating Thiobacillus ferrooxidans and eosinophilic heterotrophic bacteria (3.0-8.0%) into residual active sludge for biological reaction, automatically flowing the reaction solution by a constant flow pump into a precipitation barrel, precipitating heavy metals in the supernatant with heavy metal chelating agent or CaO, and refluxing the eosinophilic heterotrophic bacteria by the constant flow pump to the reaction barrel. Since Thiobacillus ferrooxidans is sensitive to soluble organic matters, inoculation of Thiobacillus ferrooxidans together with eosinophilic heterotrophic bacteria can reduce the contents of soluble organic matters in the reaction solution, thus can shorten the growth period of Thiobacillus ferrooxidans and improve the removal effect of heavy metals. When the method and apparatus are utilized for biological reaction for 5-7 days, the removal effect of heavy metals in residual sludge is obvious. The apparatus has such advantages as high heavy metal removal efficiency and easy operation. The method has such advantages as easy operation, and good effect.

Description

technical field [0001] The invention relates to a microbial method for removing heavy metals from excess activated sludge, which belongs to the environmental engineering technology. Background technique [0002] Excess activated sludge refers to the sediment produced in the process of purifying sewage in sewage treatment plants. Although it contains a large amount of organic matter, nitrogen and phosphorus and other plant nutrients, it also enriches a large amount of heavy metals in sewage. Difficult to use in farmland. Recycling of excess activated sludge is one of the urgent problems to be solved in 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 best disposal methods to turn harm into benefit and avoid secondary pollution. However, more heavy metals in excess sludge are limitin...

Claims

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Application Information

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IPC IPC(8): C02F11/02C02F101/20
Inventor 宋存江孙亚民黄安辉曾猛邓飞孟凤林陶健郑承纲
Owner NANKAI UNIV
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