Method for removing heavy metal Cu in sludge of urban sewage treatment plant in bioleaching mode

A technology of biological leaching and urban sewage, applied in biological sludge treatment, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems of high treatment cost, complicated operation, high concentration of energy substances, and achieve the removal effect Good, reasonable design, strong practical effect

Active Publication Date: 2016-07-20
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the prior art of using biological leaching technology to remove heavy metals in the sludge of urban sewage treatment plants, some technologies use pure T.f and T.t as leaching inoculation bacteria. This method is complicated to operate, high in processing costs, and not easy to Large-scale use; there are also some existing technologies that do not require additional inoculation of bacteria, and use the inherent bacteria in the sludge for enrichment culture to obtain domesticated sludge, and then inoculate the domesticated sludge into raw sludge for bioleaching, but need to add The concentration of energy substances is high, the inoculum amount of domesticated sludge is large, and the removal effect of heavy metals is average

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  • Method for removing heavy metal Cu in sludge of urban sewage treatment plant in bioleaching mode

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Embodiment 1

[0036] A method for biological leaching to remove heavy metal Cu in urban sewage treatment plant sludge, comprising the steps of:

[0037] (1) The first enrichment culture: take the raw sludge of the sewage treatment plant, add 3g / L Na to the raw sludge 2 S 2 o 3 and 6g / L FeSO 4 As a substrate, enrich and cultivate Thiobacillus thiooxidans and Thiobacillus ferrooxidans inherent in the raw sludge, enrich and cultivate until the pH of the sludge drops below 2.5, and obtain domesticated sludge after the first enrichment and cultivation;

[0038] (2) The second enrichment culture: take the domesticated sludge after the first enrichment culture, inoculate it into the raw sludge by volume ratio 5%, add 3g / L Na 2 S 2 o 3 and 6g / L FeSO 4 As a substrate, it is enriched and cultured under the same conditions until the pH value drops below 2.5 to obtain the domesticated sludge after the second enrichment culture;

[0039] The second enrichment culture is repeated at least once, an...

Embodiment 2

[0048] A method for biological leaching to remove heavy metal Cu in urban sewage treatment plant sludge, comprising the steps of:

[0049] (1) The first enrichment culture: take the raw sludge of the sewage treatment plant, add 4g / L Na to the raw sludge 2 S 2 o 3 and 4g / L FeSO 4 As a substrate, enrich and cultivate Thiobacillus thiooxidans and Thiobacillus ferrooxidans inherent in the raw sludge, enrich and cultivate until the pH of the sludge drops below 2.5, and obtain domesticated sludge after the first enrichment and cultivation;

[0050] (2) The second enrichment culture: take the domesticated sludge after the first enrichment culture, inoculate it into the raw sludge at 4% by volume, add 4g / L Na 2 S 2 o 3 and 4g / L FeSO 4 As a substrate, it is enriched and cultured under the same conditions until the pH value drops below 2.5 to obtain the domesticated sludge after the second enrichment culture;

[0051] The second enrichment culture is repeated at least once, and t...

Embodiment 3

[0060] A method for biological leaching to remove heavy metal Cu in urban sewage treatment plant sludge, comprising the steps of:

[0061] (1) The first enrichment culture: take the raw sludge of the sewage treatment plant, add 5g / L Na to the raw sludge 2 S 2 o 3 and 5g / L FeSO 4 As a substrate, enrich and cultivate Thiobacillus thiooxidans and Thiobacillus ferrooxidans inherent in the raw sludge, enrich and cultivate until the pH of the sludge drops below 2.5, and obtain domesticated sludge after the first enrichment and cultivation;

[0062] (2) Enrichment culture for the second time: take the domesticated sludge after the first enrichment culture, inoculate it into the raw sludge by volume ratio 6%, add 5g / L Na 2 S 2 o 3 and 5g / L FeSO 4 As a substrate, it is enriched and cultured under the same conditions until the pH value drops below 2.5 to obtain the domesticated sludge after the second enrichment culture;

[0063] The second enrichment culture is repeated at least...

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Abstract

The invention discloses a method for removing heavy metal Cu in sludge of an urban sewage treatment plant in a bioleaching mode, by means of the method, the problem that sludge of the urban sewage treatment plant contains much heavy metal Cu is solved, and the treated sludge can serve as fertilizer for agricultural utilization. The method includes the following specific steps that original thiobacillus in the sludge is enriched and cultured, acclimated sludge is obtained, the acclimated sludge serves as the inoculum and is added to raw sludge, Na2S2O3 and FeSO4 substrates are fed, the feeding amount of Na2S2O3 is controlled to be 3-5 g/L, the feeding amount of FeSO4 is controlled to be 4-6 g/L, air is blown into the sludge at the speed of 1.0-1.5 L/(min-L), stirring is conducted at a certain rotation speed, the temperature is controlled to be 20-30 DEG C, and the sludge is subjected to bioleaching; after bioleaching is conducted for 3-4 days, the removal rate of the heavy metal Cu reaches 90% or above. The method is reasonable in design and high in practicability.

Description

technical field [0001] The invention relates to a method for removing heavy metal Cu in sludge of urban sewage treatment plants, in particular to a method for removing heavy metal Cu in sludge of urban sewage treatment plants by biological leaching. Background technique [0002] Sludge is an inevitable product in the process of sewage treatment in urban sewage treatment plants. With the development of domestic sewage treatment business, the total amount of water treated by sewage plants is increasing, the degree of treatment is constantly improving, and the amount of sludge produced is also increasing. Obviously, if such a large amount of sludge is not handled properly, it will not only affect the normal operation of the sewage treatment plant, but also because the sludge contains a large amount of harmful substances, such as heavy metals, bacteria, various parasite eggs, a large number of pathogenic microorganisms, etc. It is easy to cause secondary pollution. In addition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F101/20
CPCC02F11/02C02F2101/20C02F2303/06Y02W10/20
Inventor 康得军唐虹孙健江雪匡帅
Owner FUZHOU UNIV
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