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Road building slag taking municipal sludge as raw material, preparation method and application thereof

A technology for municipal sludge and slag, applied in sludge treatment, combustion methods, biological sludge treatment, etc., can solve the problem of increasing the proportion of inorganic matter in sludge filter cakes, affecting the utilization of sludge resources, reducing organic matter and heat Value and other issues, to achieve the effect of reducing road construction costs, avoiding operational risks, and mild biological reactions

Inactive Publication Date: 2021-09-07
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Generally, the sludge is conditioned before dehydration by chemical method, but the chemical method needs to add a large amount of chemicals, which will easily increase the dry matter of the sludge and the proportion of inorganic matter in the sludge filter cake, greatly reduce the organic matter and calorific value, and affect the sludge resource utilization

Method used

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  • Road building slag taking municipal sludge as raw material, preparation method and application thereof
  • Road building slag taking municipal sludge as raw material, preparation method and application thereof
  • Road building slag taking municipal sludge as raw material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1. The sludge to be tested is taken from the residual sludge in the secondary settling tank of a sewage plant, and its basic properties are shown in Table 1.

[0047] Table 1 Basic properties of the tested sludge

[0048]

[0049] 2. Production of slag

[0050] (1) Inoculum enrichment culture

[0051] Take 150mL of the test sludge with the properties shown in Table 1 and put it into a 250mL Erlenmeyer flask, and add 6g / L sulfur powder and 2g / L pyrite powder as microbial energy materials. Place the Erlenmeyer flask in a 180r / min, 28°C constant temperature water bath shaker for shaking culture. When the pH value of the sludge system dropped to 2.8 or below, 20 mL of acidified sludge was added to 130 mL of the test sludge, and 2 g / L of reducing sulfur and ferrous sources were added at the same time, and the above operation was repeated twice. The acidified sludge after 3 enrichment cultures can meet the requirement of inoculum.

[0052] (2) Bioleaching test

[0053...

Embodiment 2

[0059] 1. The sludge to be tested was taken from the residual sludge in the secondary sedimentation tank of a sewage plant, and its basic properties are shown in Table 3.

[0060] Table 3 Basic properties of the tested sludge

[0061]

[0062]2. Production of slag

[0063] (1) Inoculum enrichment culture

[0064] Take 150mL of test sludge with the properties shown in Table 3 and put it into a 250mL Erlenmeyer flask, and add 6g / LNaS at the same time 2 o 3 and 2g / LFeSO 4 as microbial energy sources. Place the Erlenmeyer flask in a 180r / min, 28°C constant temperature water bath shaker for shaking culture. When the pH value of the sludge system dropped to 2.8 or below, 20 mL of acidified sludge was added to 130 mL of the test sludge, and 2 g / L of reducing sulfur and ferrous sources were added at the same time, and the above operation was repeated twice. The acidified sludge after 3 enrichment cultures can meet the requirement of inoculum.

[0065] (2) Bioleaching test

...

Embodiment 3

[0073] 1. The sludge to be tested is taken from the residual sludge in the secondary sedimentation tank of a sewage plant, and its basic properties are shown in Table 5.

[0074] Table 5 Basic properties of the tested sludge

[0075]

[0076] 2. Sludge solid content adjustment

[0077] (1) Inoculum enrichment culture

[0078] Take 150mL of test sludge with the properties shown in Table 5 and put it into a 250mL Erlenmeyer flask, and add 6g / LNaS at the same time 2 o 3 And 2g / L pyrite powder as microbial energy material. Place the Erlenmeyer flask in a 180r / min, 28°C constant temperature water bath shaker for shaking culture. When the pH value of the sludge system drops to 2.8 or below, take 20mL of acidified sludge and add it to 130mL of the test sludge, and add 2g / L NaS 2 o 3 And pyrite powder, repeat the above operation 2 times. The acidified sludge after 3 enrichment cultures can meet the requirement of inoculum.

[0079] (2) Bioleaching test

[0080] Put the tes...

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Abstract

The invention belongs to the technical field of municipal sludge treatment, and particularly discloses road building slag taking municipal sludge as a raw material, a preparation method and application thereof. According to the invention, microorganisms subjected to enrichment culture are added into municipal sludge, and active thalli in the sludge are completely replaced by the microorganisms through a biological extraction reaction; the extraction microorganisms are mainly autotrophic bacteria, the sludge is mainly heterotrophic bacteria, the oxidation and acidification effects of the flora are utilized to condition the sludge, and the water content is reduced to the sludge treatment requirement after mechanical dehydration; and the slag is prepared by means of drying, calcining and the like and is used as a road building material, so that an efficient and economic new way is opened up for reduction, harmlessness and resourceful treatment of the municipal sludge and development of cheap road building materials.

Description

technical field [0001] The invention belongs to the technical field of urban sludge treatment, and in particular relates to a road construction slag made of urban sludge as a raw material, a preparation method and application thereof. Background technique [0002] Municipal sludge comes from a large amount of sludge produced in the sewage treatment process, and its quantity accounts for about 0.3% to 0.5% of the total treated water (based on a moisture content of 97%). According to the source can be divided into: [0003] ① The primary sedimentation sludge comes from the primary sedimentation tank; [0004] ② The remaining activated sludge comes from the secondary sedimentation tank of the activated sludge process; [0005] ③Humic sludge, from the secondary sedimentation tank of the biofilm process; [0006] The above three kinds of sludge can be collectively referred to as raw sludge or fresh sludge. [0007] ④ Digested sludge, raw sludge is called digested sludge or co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/02C02F11/127C02F11/13F23G7/00E01C7/00
CPCC02F11/00C02F11/02C02F11/127C02F11/13F23G7/00E01C7/00C02F2303/06F23G2209/12
Inventor 耿雨馨洪伟彬刘桂帆罗凯荣翟心瑜王佳德江海桐石明岩
Owner GUANGZHOU UNIVERSITY
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