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Microorganism detoxification, and solidification and hazard-free treatment method for metal substrate sludge

A technology of toxic metals and microorganisms, applied in the field of environmental engineering, can solve problems such as complicated procedures, low efficiency, and high energy consumption, and achieve the effects of less process equipment, good application prospects, and simple operation

Inactive Publication Date: 2010-12-01
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a method for detoxifying and solidifying harmless microorganisms of acidophilic thiobacillus and acid-resistant sulfate-reducing bacteria in toxic metal bottom sludge, which overcomes the shortcomings of traditional detoxification methods such as complicated procedures, high energy consumption, and low efficiency. And to avoid the incomplete detoxification method of acidophilus thiobacillus and the deficiency of secondary pollution

Method used

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  • Microorganism detoxification, and solidification and hazard-free treatment method for metal substrate sludge
  • Microorganism detoxification, and solidification and hazard-free treatment method for metal substrate sludge
  • Microorganism detoxification, and solidification and hazard-free treatment method for metal substrate sludge

Examples

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Effect test

Embodiment 1

[0018] The samples were collected from the sediment of a toxic metal-polluted river in Shandong Province. The basic properties are shown in Table 1. The bottom sludge is black and smelly, heavily polluted by Zn, Cr and Cu. After sampling, the stones, gravel, and animal and plant residues in the mud samples were removed, and stored in a refrigerator at 4°C.

[0019] Table 1 Basic properties of sediment

[0020]

[0021]Step 1: Pump the bottom sludge with a solid content of 10% into the bioreactor A, add 3g / L sulfur powder, and at the same time insert the 8% inoculum of Thiobacillus acidophilus FD97 bacteria solution, and cultivate it with ventilation at room temperature for 12 days. The pH of the bottom sludge in bioreactor A is reduced to 2.5, and then, the bottom sludge in bioreactor A is pumped into sedimentation tank A for solid-liquid sedimentation separation, and 10% of the bottom sludge in the sedimentation tank is returned to bioreactor A again, Add the bottom mud ...

Embodiment 2

[0031] The sample is the dredged sediment of a certain river in Guangdong. The pH of the sediment is 8.3, and the organic matter content is 18%. The only toxic metal in the sediment is Zn, which is 388mg / kg.

[0032] The specific implementation method is the same as example 1: the bottom mud was treated for 13 days (inoculum size 5%, sulfur powder addition 2g / L) through acidophilic thiobacillus in the bioreactor A, and the bottom mud pH was down to 3.0. After precipitation, 5% of Settling mud is refluxed, and with example 1 step cycle treatment, 95% of settling mud is dehydrated, and residual Zn content is reduced to 85mg / kg in the dehydration; The acidic metal waste liquid that dehydration produces adds 8.0g / L sodium lactate, adjusts pH with magnesium oxide After reaching 4.0, put it into bioreactor B, add acid-resistant sulfate-reducing bacteria at the same time according to the inoculation amount of 15%, anaerobic treatment, after stabilization, the pH of the effluent rises ...

Embodiment 3

[0034] The bottom mud sample is the same as the bottom mud in Example 1.

[0035] The specific implementation method is the same as example 1: in the bioreactor A, pump the bottom mud with a solid content rate of 15%, add 4g / L sulfur powder, add acidic Thiobacillus acidophilus FD97 bacterium liquid by 10% inoculum simultaneously, aeration culture 15d, Bottom mud pH is reduced to 2.6, is driven into sedimentation tank A and settled, and 10% of settled mud returns to flow into reactor A and is treated with example 1 method cycle, and 90% of settled mud is dehydrated, and residual Zn, Cr and Cu content in decementing, through The detections were 97, 121 and 58mg / kg respectively, and the pH of the waste liquid produced by dehydration was 2.2, Zn 2+ 、Cu 2+ and Cr 3+ Contents were 93, 10.7 and 16mg / L, SO 4 2- The content is 7960mg / L; add 7.0g / L ethanol to the above waste liquid, adjust the pH to 3.8 with quicklime, pour it into bioreactor B, and add acid-resistant sulfate-reduci...

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Abstract

The invention relates to a microorganism detoxification, and solidification and hazard-free treatment method for metal substrate sludge. The method comprises the following steps of: lowering the pH value of the substrate sludge to be 2.5 to 3.0 under the action that sulfuric acid is generated by microbial oxidation of acidithiobacillus spp.; dissolving toxic metal from a solid phase of the substrate sludge into a liquid phase; and performing solid-liquid separation to obtain acid toxic metal waste solution and solid-phase acid substrate sludge which hardly contains toxic metal, and in the liquid-phase part, reacting microbial reduction product H2S of acid-resisting sulfate reducing bacteria with toxic metal ions to obtain metal sulfide deposit to realize standard emission; and performing solidification treatment on the solid-phase part by using caustic sludge as a modifier and using cement as a curing agent to finally finish full detoxification and hazard-free treatment of the toxic metal substrate sludge, wherein the treated substrate sludge meets the requirements of engineering filling and landfill. The method of the invention has the advantages of full detoxification, no secondary pollution, a few process devices, low energy consumption and suitability for industrial operation.

Description

technical field [0001] The invention relates to a method for treating toxic metal bottom sludge by combining microorganism detoxification (acidophilic thiobacillus and acid-resistant sulfate-reducing bacteria) and cement solidification to make the bottom sludge harmless, and belongs to the technical field of environmental engineering. Background technique [0002] The rapid industrial development and the sharp increase in energy consumption have caused the accumulation of toxic metals in the sediments of many rivers, lakes and other water bodies. According to the survey, in some economically developed areas, the content of toxic metals such as Cu, Zn, Pb, Cr and Ni in the sediment reaches 300-1000mg / kg. 2000~5000mg / kg. Removal of toxic metals in polluted sediment is of great significance for ensuring the health of the water environment, solving the outlet for sediment, and expanding its resource utilization. [0003] At present, the treatment methods of toxic metal sedimen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F3/28C02F11/14
Inventor 方迪王方张瑞昌赵亮
Owner OCEAN UNIV OF CHINA
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