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Technical method of microwave pyrolysis treatment of municipal sludge

A municipal sludge and pyrolysis technology, which is applied in the direction of pyrolysis treatment of sludge and vaporization of by-products, etc., can solve the problems of low gas production rate, low oil production quality, and no guarantee of biosafety performance of sludge residues. Achieve the effect of reducing the harm of environmental pollution and responding quickly and efficiently

Inactive Publication Date: 2018-08-31
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gas production rate of this method is not high, the quality of oil production is not high, and the biosafety performance of the final sludge residue is not guaranteed

Method used

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  • Technical method of microwave pyrolysis treatment of municipal sludge
  • Technical method of microwave pyrolysis treatment of municipal sludge
  • Technical method of microwave pyrolysis treatment of municipal sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1 Microwave pyrolysis treatment of municipal sludge device

[0047] according to figure 1 , the (single-mode microwave oven) device includes, 1-temperature display, 2-ammeter, 3-power adjustment knob, 4-operation switch, 5-stop switch, 6-timing switch, 7-lighting switch, 8-emergency stop Switch, 9-microwave switch, 10-single-mode microwave oven cavity, 11-high-purity nitrogen delivery part, 12-product collection part, 13-microwave transmitter, 14-insulation cotton, 15-quartz reactor, 16-thermocouple.

[0048] Wherein, the front portion of 1-single-mode microwave oven cavity is provided with 13-microwave launcher, 15-quartz reactor is placed inside 1-single-mode microwave oven cavity, 16-thermocouple is arranged at the front portion of 15-quartz reactor, and 13-corresponding to the microwave transmitter, 11-high-purity nitrogen delivery part and 12-product collection part are separately placed inside the quartz reactor. Components 3-9 control the reaction in th...

Embodiment 2

[0051] Embodiment 2 The technical method of microwave pyrolysis treatment municipal sludge device, comprising:

[0052] The experimental device (single-mode microwave oven) of the present invention described in the examples and the method for in-situ pyrolysis and fixing of metals to microwaves are used.

[0053] The first step: Dry the raw sludge of the sewage treatment plant until the quality does not change;

[0054] The second step: Grind the sludge into small particles, add pyrolysis catalyst and microwave absorber, stir and mix;

[0055] The third step: put the sludge into the microwave pyrolysis device, and then pass in nitrogen to pyrolyze;

[0056] The fourth step: cooling after reaction to collect energy gas and treated sludge.

[0057] Experimental conditions: before microwave pyrolysis, high-purity nitrogen gas (99.9%) was introduced for 20 minutes at a flow rate of 100 mL / min. After the start of microwave heating, adjust the nitrogen flow to 30-40mL / min. The p...

Embodiment 3

[0060] Embodiment 3 effect evaluation

[0061] Wherein, dry sludge: water according to the following ratio, unit: g / ml After being processed according to the device of embodiment 1 and the method of embodiment 2, the result of producing energy gas is as follows:

[0062]

[0063]

[0064] By adopting the control of the preferred pyrolysis temperature, pyrolysis time, microwave absorber and pyrolysis catalyst etc. in the present invention, the above corresponding energy gas results can be obtained, and the sludge can be effectively treated.

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Abstract

The invention provides a technical method for treating civil sludge through microwave pyrolysis. The method comprises the following steps: adding a sludge sample into a microwave pyrolysis device (single-mode microwave oven); and introducing nitrogen and treating through pyrolysis. The method provided by the invention is adopted for performing microwave in-situ pyrolysis treatment on the civil sludge from a sewage plant, wherein the reaction is quick and efficient, and the final products include a gaseous product (the maximum hydrogen content can reach 70% or more, and the maximum methane content can reach 60% or more), a liquid-state product (the major component is fatty acid of which the maximum content can reach 30% or more) and pyrolysis residue; and the gaseous product and liquid-state product can be recycled. Microwaves realize a particularly obvious fixing effect on heavy metals in the sludge, and the residual forms of six heavy metals are all over 75%, thereby greatly reducing the harm of environmental pollution from raw sludge.

Description

technical field [0001] The invention belongs to the technical field of resource and environment protection, and in particular relates to a technical method for microwave pyrolysis treatment of municipal sludge. Background technique [0002] The sludge treatment methods of the prior art mainly contain the following types: [0003] 1. Sanitary landfill of sludge [0004] Sludge sanitary landfill began in the 1960s and is a relatively mature sludge disposal technology. Sludge can be landfilled alone or together with domestic waste and industrial waste. This disposal method is simple, easy to implement, and low in cost. The sludge does not require high dehydration and has strong adaptability. Landfills are generally abandoned mine pits or natural low-lying land. [0005] 2. Direct land use of sludge [0006] Sludge land use is to apply sludge or dried sludge and biosolids formed by fermentation to forest land, orchards, grasslands, municipal greening, seedling substrates, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/10
CPCY02W10/40
Inventor 方琳马睿周杨袁琦袁娜娜李珊婷孙宏元
Owner SHENZHEN UNIV
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