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Thiobacillus thiooxidans and biological eliminating method of chromium in tanning sludge

A technology of Thiobacillus thiooxidans and tannery sludge, which is applied in the field of environmental engineering, can solve the problems of harsh operating environment, secondary pollution, and high cost of chemical extraction, and achieves friendly operating environment, mild reaction, and no secondary pollution. pollution effect

Inactive Publication Date: 2004-10-06
周立祥 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Purpose of the invention: the purpose of the present invention is to provide a biological removal method of chromium in Thiobacillus thiooxidans and tannery sludge, which overcomes the high cost of chemical extraction in the prior art, harsh operating environment, and generation of secondary Secondary pollution and other defects, using biological methods to remove the toxic heavy metal Cr in tannery sludge, so that the removal rate of Cr can reach 95%-100%, and the retention rate of plant nutrients N, P and organic matter in the sludge is above 80%

Method used

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  • Thiobacillus thiooxidans and biological eliminating method of chromium in tanning sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0028] (1) Sampling

[0029] The thickening tank sludge of a tannery wastewater treatment plant in Haining, Zhejiang Province was taken. The basic properties of the tannery sludge are shown in Table 1.

[0030] Table 1 Basic properties of leather sludge for trial

[0031] pH Cr Solid content NP Organic matter

[0032] mg / kg %

[0033] 8.05 15900 11.84 3.03 0.51 54.6

[0034] (2)TS6 Bacteria isolation and expansion culture:

[0035] Thiobacillus thiooxidans bacterial strain provided by the present invention is named as TS 6 , Classification number: Thiobacillus thiooxidans, has been preserved in the depository unit designated by the Chinese Patent Office - the General Microorganism Center of the China Microorganism Culture Collection Management Committee, the preservation date is July 4, 2002, and the preservation registration number is CGMCC NO.0759. The characteristics of the bacteria are: short rod-sha...

Embodiment 2

[0045] (1) Sampling:

[0046] Get the tannery sludge in the thickening tank of a certain tannery wastewater treatment plant in Haining, Zhejiang, which is the same as the sludge sample in Example 1.

[0047] (2)TS 6 Bacteria isolation and expansion culture:

[0048] With embodiment 1.

[0049] (3) Start-up and operation of the bioreactor

[0050] Add the above-mentioned non-dewatered tannery sludge to the bioreactor, add 1g / L elemental sulfur, and add the above-mentioned TS at the same time 6 10% (v / v) was stirred and ventilated to start the reaction of microorganisms to remove Cr, and when the pH of the tanning sludge in the bioreactor was reduced from 8.05 to 2.0 (3-5 days), the bioreactor was taken out The sludge in the sedimentation tank enters the settling tank for gravity settlement, and 15% (v / v) of the settled sludge is returned to the bioreactor, and the remaining 85% is separated from solid and liquid:

[0051] (4) Solid-liquid separation and recycling of chromi...

Embodiment 3

[0057] (1) Sampling:

[0058] Take undewatered sludge from a tannery in Nanjing, Jiangsu. The basic characteristics of the sludge are shown in Table 4.

[0059] Table 4 Basic characteristics of trial leather sludge

[0060] pH Cr Solid NP Organic

[0061] rate quality

[0062] mg / kg %

[0063] 7.55 19000 9.60 3.48 1.05 60.2

[0064] (2)TS 6 Bacteria isolation and expansion culture:

[0065] With embodiment 1.

[0066] (3) Start-up and operation of the bioreactor

[0067] Add the above non-dewatered sludge to the bioreactor, add 3g / L elemental sulfur, add the above TS 6 (10%, v / v) was stirred and ventilated to start the reaction of microorganisms to remove heavy metals. When the pH of the sewage sludge in the bioreactor was reduced from 7.55 to 2.0 (3-6 days), it could pass through the peristaltic pump Take out the sludge in the bioreactor, 20% (v / v) of the sludge is reflowed...

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Abstract

The invention relates to sulfur oxide sulfur bacilli and biological eliminating method of chromium in tanning mud. Bacterial strain is named as TS6, preserve mark is CGMCCNO.0759. The method of eliminate chromium in tanning mud by above mentioned sulfur oxide sulfur bacilli is adding 1-3 g / L sulfur into tanning mud in biology reactor, inocualting 10-15% (v / v, the same below) TS6 bacteria strain, stirring, ventilating and subsiding; that 10-20% of subsiding mud backflow to reactor; dehydrating suprplus subsiding mud; adding basic material into liquid part to turn Cr3+ into Cr(OH)3 and subside, sediment is dissolved by sulfuric acid, then there is the tannage stage; solid part is neutralized to agriculture. The elimianting rate of Cr in mud is 95%-100%, reserving rate of nutrient in mud is above 80%.

Description

1. Technical field [0001] The invention relates to a biological removal method of chromium in thiobacterium thiooxidans and tannery sludge, which is a technology for removing toxic heavy metal chromium in tannery sludge by using acidophilic thiobacterium, and belongs to the technical field of environmental engineering. 2. Background technology [0002] Tannery sludge (Tannery Sludge) is the sediment produced in the process of wastewater treatment in tannery. Most of the tannery enterprises in my country use chemical-biological method as the main process to treat the tannery wastewater. According to the statistics of China Leather Industry Association, in 1998, the raw leather processing volume in my country was about 100 million standard sheets, and the annual waste water discharge of the tanning industry was 100 million tons, producing 3 million tons of tanning sludge (calculated with a solid content of 10%). Tannery sludge is rich in nutrients such as N (3-5%), P (0.5-1%),...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C12N1/20
CPCY02W10/20
Inventor 周立祥周顺桂
Owner 周立祥
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