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Technology for removing heavy metal Cu in municipal sludge

A technology for municipal sludge and heavy metals, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problem of increasing the proportion of inorganic substances in sludge dry sludge filter cake and affecting sludge Resource utilization, reducing heavy metal leaching efficiency and other issues, to achieve the effect of reducing the risk of post-acidification effect, good ecological security, and changing bioavailability

Active Publication Date: 2018-08-21
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical method is mainly based on electric restoration, but the amount of sludge treated by it is limited, it is not easy to dispose on a large scale, and the treatment cost is high
The chemical method usually needs to add a large amount of chemicals, which will easily increase the amount of sludge dry matter and the proportion of inorganic matter in the sludge filter cake, greatly reduce the organic matter and calorific value, and affect the utilization of sludge resources.
The biological method is mainly based on microbial leaching. Compared with the physical and chemical methods, this method does not need to add a large amount of chemicals, saving costs, and at the same time can retain nutrients such as N and P in the sludge to the greatest extent, which is beneficial to resource utilization; Leaching needs to add hydrophobic substances such as sulfur powder and pyrite powder as microbial energy substances. Due to the limited utilization of energy substances by microorganisms, the leaching efficiency of heavy metals is greatly reduced and the treatment cycle is prolonged; if the energy substances are increased, especially If the dosage of sulfur powder is higher, it will easily cause the "post-acidification effect" of the soil.

Method used

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  • Technology for removing heavy metal Cu in municipal sludge
  • Technology for removing heavy metal Cu in municipal sludge
  • Technology for removing heavy metal Cu in municipal sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The present embodiment provides the removal process of heavy metal copper in municipal sludge, which comprises the following steps:

[0036] S1) Add sulfur powder 10g, ferrous sulfate 10g and APG-10 0.6g per liter of municipal sludge, add sulfur powder, ferrous sulfate and APG-10 to 150mL municipal sludge, and place in a water bath shaker The first shaking culture of microorganisms was carried out at a constant temperature of 28°C at a speed of 180r / min; when the pH value of the municipal sludge was 2.5, the first shaking culture was ended, and the first culture was obtained;

[0037]S2) add city sludge to described culture for the first time, add sulfur powder 2g, ferrous sulfate 2g and APG-10 0.6g per liter volume in the mixture of city sludge and culture for the first time, add city sewage Sulfur powder, ferrous sulfate and APG-10 were added to the mixture of the mud and the first culture, and placed in a water bath shaker at a speed of 180r / min at a constant tempera...

Embodiment 2

[0042] This embodiment provides the removal process of heavy metal copper in municipal sludge, similar to the removal process of Example 1, the difference is:

[0043] 1) In step S1), add sulfur powder 10g, ferrous sulfate 10g and APG-100.6g in every liter of volume municipal sludge, add sulfur powder, ferrous sulfate and APG-10 in 140mL municipal sludge, after that Carry out the first shaking culture of microorganisms;

[0044] 2) In steps S1), S2) and S3), when the pH value of the municipal sludge is 2.6, the shaking culture is ended;

[0045] 3) In steps S1), S2), S3) and S4), the rotation speed of the shaker during shaking culture is 170r / min, and the temperature of shaking culture is 27°C;

[0046] 4) In step S2), the volume ratio of the municipal sludge added in the culture for the first time to the culture for the first time is 6; in step S3), the municipal sludge added in the culture for the second time The volume ratio to the second culture is 6;

[0047] 5) In ste...

Embodiment 3

[0050] This embodiment provides the removal process of heavy metal copper in municipal sludge, similar to the removal process of Example 1, the difference is:

[0051] 1) In step S1), add sulfur powder 10g, ferrous sulfate 10g and APG-100.6g in every liter of volume municipal sludge, add sulfur powder, ferrous sulfate and APG-10 in 160mL municipal sludge, after that Carry out the first shaking culture of microorganisms;

[0052] 2) In steps S1), S2) and S3), when the pH value of the municipal sludge is 2.8, the shaking culture is ended;

[0053] 3) In steps S1), S2), S3) and S4), the rotation speed of the shaker during the shaking culture is 190r / min, and the temperature of the shaking culture is 29°C;

[0054] 4) In step S2), the volume ratio of the municipal sludge added in the culture for the first time to the culture for the first time is 7; in step S3), the municipal sludge added in the culture for the second time The volume ratio to the second culture is 7;

[0055] 5...

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Abstract

The invention discloses a technology for removing heavy metal Cu in municipal sludge and belongs to the technical field of sludge treatment. According to the technology, ferrous sulfate is taken as aF2<2+> source, powdered sulfur is taken as a sulfur source, a moderate surfactant is blended, the effect of biologically extracting heavy metal Cu from municipal sludge is strengthened, and the purpose of stabilization treatment of sludge is achieved.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, in particular to a process for removing heavy metal copper in urban sludge. Background technique [0002] Municipal sludge, as a by-product of sewage treatment plants, contains heavy metals in varying degrees; especially urban sewage sludge with a relatively large proportion of industrial wastewater has the most serious heavy metal pollution. There are many kinds of heavy metals in sludge, which have the characteristics of enrichment, concealment and stability, and are difficult to degrade naturally in the environment, which has become the primary problem restricting the resource utilization of sludge. [0003] There are three main methods for removing heavy metals from sludge: physical, chemical, and biological. The physical method is mainly based on electric restoration, but the amount of sludge treated by it is limited, it is not easy to dispose on a large scale, and the treatment co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/12C02F11/00
CPCC02F11/00C02F11/02C02F11/122C02F2101/20C02F2303/06
Inventor 石明岩孙琪刘建宏温贵成倪承之刘恒甫王施政
Owner GUANGZHOU UNIVERSITY
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