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Method for removing heavy metals from sludge

A heavy metal and sludge technology, applied in biological sludge treatment, sewage/sludge fertilizer, application, etc., can solve the problems of time-consuming and difficult to completely remove heavy metals from sludge, achieve high removal rate, improve economic benefits and social Benefits, the effect of reducing the content of heavy metals

Active Publication Date: 2018-12-21
成都碧青环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bioleaching technology also has the advantages of simple operation and no special control in the operation process, but there are problems such as time-consuming and difficult to completely remove heavy metals in sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: A kind of method of removing heavy metal in sludge

[0028] 100Kg of sludge, after testing, contains Cd 76.7mg / Kg, Pb 1.53g / Kg, Cr 1.46g / Kg, Hg 37.9mg / Kg.

[0029] Include the following steps:

[0030] (1) Biochar-loaded Thiobacillus: add biochar to the Thiobacillus solution, the weight ratio of Biochar and Thiobacillus is: 100:2, mix and stir for 7 minutes to obtain the Biochar loaded with Thiobacillus;

[0031] (2) Biological leaching: add the biochar loaded with Thiobacillus to the sludge, the addition amount is 3% of the sludge amount, adjust the sludge water content to 150%, adjust the sludge pH to 3.5, every 2 hours Agitate for 30 minutes, then stand still for 12 hours after 48 hours, discharge the supernatant liquid of the sludge, adjust the water content of the sludge to 150% again, stir for 20-30 minutes every 2 hours, and let stand for 12 hours after 24-48 hours. Drain the sludge supernatant;

[0032] (3) Adsorption again: add the biochar of u...

Embodiment 2

[0045] Embodiment 2: A kind of organic fertilizer prepared by sludge

[0046] 100Kg of sludge, after testing, contains Cd 76.7mg / Kg, Pb 1.53g / Kg, Cr 1.46g / Kg, Hg 37.9mg / Kg.

[0047] Include the following steps:

[0048] (1) Biochar-loaded Thiobacillus: add biochar to the Thiobacillus solution, the weight ratio of Biochar and Thiobacillus is: 100:2, mix and stir for 7 minutes to obtain the Biochar loaded with Thiobacillus;

[0049] (2) Biological leaching: add the biochar loaded with Thiobacillus to the sludge, the addition amount is 3% of the sludge amount, adjust the sludge water content to 150%, adjust the sludge pH to 3.5, every 2 hours Agitate for 30 minutes, then stand still for 12 hours after 48 hours, discharge the supernatant liquid of the sludge, adjust the water content of the sludge to 150% again, stir for 20-30 minutes every 2 hours, and let stand for 12 hours after 24-48 hours. Drain the sludge supernatant;

[0050] (3) Adsorption again: add the biochar of unlo...

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Abstract

The invention relates to a method for removing heavy metals from sludge. Biological leaching of sludge is carried out by supporting thiobacillus on biochar, and and can efficiently remove a variety ofheavy metals in the sludge by combining with elimination and renewal of hydrops, biochar adsorption and the like with low energy consumption, low cost and no need of calcining and heating. The sludgetreated by the method has a high removal rate of the heavy metals and can be widely used in the preparation of organic fertilizers, biochar, etc., greatly improving the economic and social benefits of sludge treatment.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a method for removing heavy metals in sludge. Background technique [0002] With the continuous increase of my country's urban population and the continuous increase of industrial scale, the demand for domestic sewage and industrial sewage treatment continues to increase. With the continuous improvement of my country's sewage treatment capacity, how to deal with the sludge that appears in the sewage treatment process problems are becoming more and more prominent. Since sludge contains a variety of organic matter, inorganic matter and heavy metal ions, it often has a foul smell, and if it is discharged and buried at will, it will not only pollute the air, but may also cause heavy metal pollution to soil and water sources. [0003] For the treatment of sludge, concentration, tempering, dehydration, stabilization, drying or incineration are generally used for sludge reduction or harm...

Claims

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Application Information

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IPC IPC(8): C02F11/02C05F7/00
CPCC02F11/02C05F7/00Y02A40/20
Inventor 廖志高
Owner 成都碧青环保科技有限公司
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