CN104843962A - Method for preparing marsh gas and producing sintered bricks by using municipal sludge - Google Patents

Method for preparing marsh gas and producing sintered bricks by using municipal sludge Download PDF

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Publication number
CN104843962A
CN104843962A CN201510251960.XA CN201510251960A CN104843962A CN 104843962 A CN104843962 A CN 104843962A CN 201510251960 A CN201510251960 A CN 201510251960A CN 104843962 A CN104843962 A CN 104843962A
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sludge
produced
municipal sludge
dry
municipal
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CN201510251960.XA
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CN104843962B (en
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杨小兵
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DONGJIANG ENVIRONMENTAL Co Ltd
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DONGJIANG ENVIRONMENTAL Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/60Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

Abstract

The invention relates to a method for preparing marsh gas and producing sintered bricks by using municipal sludge. The method comprises the following steps: supplying steam to a dry anaerobic fermentation tank from a steam boiler, carrying out dry anaerobic fermentation on the municipal sludge, and producing marsh gas and anaerobic fermentation sludge after fermenting; conditioning, modifying and dewatering the anaerobic fermentation sludge, supplying the anaerobic fermentation sludge to a drying device for drying, then crushing the anaerobic fermentation sludge to obtain dry sludge powder; mixing the dry sludge powder with building waste soil and producing brick blanks by extrusion molding; and supplying the brick blanks into a system for producing bricks by using sludge, drying and roasting to produce sintered bricks. The smoke in the system for producing bricks by using sludge can be simultaneously used as the heat source of the steam boiler and the drying device; the marsh gas produced after fermenting the municipal sludge can be used as a heating fuel of the system for producing bricks by using sludge. The method has the technical effects that almost no secondary pollution is generated when the municipal sludge is treated, and the comprehensive utilization of energy can be implemented.

Description

Municipal sludge is prepared biogas and is produced the method for vitrified brick
Technical field
The present invention relates to a kind of solid waste disposal, disposal and recycling, particularly a kind of municipal sludge that utilizes produces biogas and produces the method for vitrified brick.
Background technology
The main purpose of sludge treatment, disposal is by sludge reduction, stabilization and resource utilization.At present, sludge reduction, stabilization is realized mainly through solidify & bury, anaerobic digestion, aerobic compost and burning etc.When global resources growing tension, the resource utilization of mud, recovery energy should be the dominant direction of sludge disposal.
The high-moisture percentage of mud is the important factor hindering recycling sludge to utilize.Sewage treatment plant residual mud, through concentrating, digesting and after mechanical dehydration, generally still contain the moisture content of about 80%.Because there is one deck extracellular polymeric in mud extracellular, mud is caused to dewater further difficulty.After adding amendment conditioning, can carry out deep dehydration, after deep dehydration, water ratio is generally about 60%, can think, 60% is the water cut limit of deep dehydration.Heat drying, burning disposal are carried out to the mud after deep dehydration, although the minimizing of mud can be realized, there is cost high, serious to the secondary sludge of environment, easily cause the shortcomings such as public event, thus cannot large-scale promotion.
In dewatered sludge, vitrified brick produced by other starting material of fusion is a kind of method that sludge treatment utilizes, can curing heavy metal completely by sintering, is the desired Safety approach of sludge disposal.But at present in technology, be difficult to the vitrified brick obtaining high mud volume, major cause is that in mud, organic content is higher, makes raw material plasticity difference and there is certain elasticity, being difficult to be pressed into closely knit adobe by high pressure.In order to improve the intensity of vitrified brick, a large amount of clays need be mixed, causing the considerable damage to land resources.
Containing a large amount of organism in municipal sludge, such as carbohydrate, protein, fat etc., contain abundant biomass energy, how effectively to recycle the energy in excess sludge, have economy and environment comprehensive benefit.
Summary of the invention
The technical problem to be solved in the present invention is to avoid carrying out heat drying to the mud after deep dehydration in prior art, burning disposal exists high and serious to the secondary sludge of the environment problem of cost, in the mud simultaneously avoiding other starting material of fusion in existing dewatered sludge to produce existing for vitrified brick, organic content is higher, be difficult to the problem being pressed into closely knit adobe by high pressure, propose a kind of municipal sludge and prepare biogas and the method for producing vitrified brick, substantially secondary pollution is not existed to the process of municipal sludge, and realizes comprehensive utilization of energy.
For the above-mentioned technical problem that will solve, the technical solution adopted in the present invention is as follows:
There is provided a kind of municipal sludge to prepare biogas and produce the method for vitrified brick, comprising the following steps:
Sent in dry-type anaerobic fermentation tank by municipal sludge, and send into steam from steam boiler to dry-type anaerobic fermentation tank, municipal sludge carries out dry-type anaerobic fermentation, produces biogas and anaerobically fermenting mud after fermentation;
The modification of described anaerobically fermenting sludge conditioning is dewatered, sends into drying installation and carry out drying and then carry out pulverizing and obtain dewatered sludge powder;
Described dewatered sludge powder being mixed also extrusion molding with architecture sediment is adobe;
Described adobe sent in making brick from sludge system, drying, roasting obtain vitrified brick;
Flue gas in described making brick from sludge system is simultaneously as the thermal source of steam boiler and drying installation, and the biogas produced after municipal sludge fermentation is as the heating fuel of making brick from sludge system.
Further:
After municipal sludge mixes afforestation rubbish, then be admitted in dry-type anaerobic fermentation tank and carry out dry-type anaerobic fermentation.
Described anaerobically fermenting mud adopts belt filter press dehydration, and the anaerobically fermenting moisture percentage in sewage sludge after dehydration is down to less than 55%.
After described anaerobically fermenting drying sludge, its moisture percentage in sewage sludge is down to less than 30%.
The particle diameter of the dewatered sludge powder that dried anaerobically fermenting mud obtains after pulverizing is 20 ~ 40 orders.
Roll crusher is adopted to carry out fragmentation after described dewatered sludge powder mixes with architecture sediment.
Described dewatered sludge powder mixes with architecture sediment, and wherein the weight percent of dewatered sludge powder is 40 ~ 60%.
Described dewatered sludge powder and architecture sediment adopt the extrusion molding of bipolar extrusion under vacuum machine.
The leavening temperature of described dry-type anaerobic fermentation is 35 DEG C or 55 DEG C, fermentation period 25 ~ 30 days.
The maturing temperature of described adobe is 900 ~ 1000 DEG C.
Compared with prior art, technique effect of the present invention is:
The present invention for raw material, adopts dry anaerobic fermentation process with the high municipal sludge of water ratio, and compared to wet type anaerobically fermenting, owing to need not add moisture content dilution mud, have treatment scale large, floor space is few, reduced investment and running cost low.
The present invention, by anaerobic digestion, reduces organic content in mud, produces biogas and can be used as clean energy, and in digestive process, microorganism micelle structure is destroyed, and is conducive to follow-up dehydration, can when adding less not even with amendment, dehydrating effect is good.
The present invention adopts belt filter press to carry out deep dehydration to mud, and relative to filter press, belt filter-pressing device runs continuously, and dewatering time is short, treatment capacity is large and floor space is little, saves labour turnover.
The present invention carries out pulverization process to sludge-drying, and mud granule is tiny, mixes in brickmaking process with other raw material, and sintered products matter is close, intensity is high.
The present invention collects biogas as tunnel furnace fuel, and the high-temperature flue gas that tunnel furnace produces as the thermal source of drying installation, and imports steam boiler generation steam, and heating fermentation raw material, achieves the recycle of the energy in the entire system, reduce the energy consumption of whole system.
The present invention adopts architecture sediment as baked brick raw materials, does not need clay, achieves the cycling and reutilization of refuse, protects national cultivated land resource.
Accompanying drawing explanation
Fig. 1 is that municipal sludge of the present invention is prepared biogas and produces the schematic flow sheet of vitrified brick method.
Embodiment
Now by reference to the accompanying drawings, embodiments of the invention are elaborated.
As shown in Figure 1, municipal sludge of the present invention is prepared biogas and is produced vitrified brick method and comprises the following steps:
Step 1: municipal sludge, water ratio about 80%, pours into raw material Receiving bin, is provided with movable floor in raw material Receiving bin, in operational process, carry out preliminary mix and blend to mud, and is quantitatively taken out in Receiving bin by mud and deliver to follow-up equipment.
Step 2: mud directly sends into dry fermentation tank feeding unit after promoting.Steam sends into dry fermentation tank feeding unit by pipeline, carries out mixing, heating up together with mud, and sends into dry fermentation tank by pipeline.
Step 3: mud carries out biological degradation after sending into dry fermentation tank under closed environment.Through the anaerobic fermentation process of one-period, organic matter fractions biological degradation wherein also produces biogas.
Fermentor tank is the concrete material of dry anaerobic fermentation tank, fermentor tank, field fabrication.Agitator is provided with, by even for the material stirring in fermentor tank in fermentor tank.Temperature 35 DEG C or high temperature 55 DEG C fermentation during anaerobically fermenting adopts.Fermentation materials adopts the type of heating of steam, by steam directly with the mixing of materials of charging, reach the temperature needed for fermentation, fermentor tank outer wall adopts Insulation simultaneously, the calorific loss of minimizing fermentor tank.
Step 4: mud ferments 25 ~ 30 days in anaerobic fermentation tank, residues is anaerobic sludge (natural pond slag), is delivered to the intermediate storage tank of sludge dewatering system by fermentor tank drawing mechanism.
Step 5: the biogas that anaerobic fermentation system produces, be a kind of clean fuel, main component is CH 4, CO 2, H 2s, NH 3, the impurity such as steam and dust.The biogas that fermentor tank produces sends into biogas mother pipe by pipeline, is carried by the biogas pressure of fermentor tank self.First the biogas produced process through desulfurization dewatering system.Biogas feeding gas-holder through purifying treatment stores.Biogas as clean energy for making brick from sludge system as tunnel furnace.
Step 6: anaerobic sludge is modified through amendment conditioning, is directly dewatered by belt filter press press filtration fast deep.Water ratio about 55% after deep dehydration.
Step 7: deep dehydration mud is sent to drying installation buffer bin, is delivered in each unit of drying installation by cloth spiral.In employing baked brick tunnel kiln, flue gas is as drying installation thermal source.After dry, mud falls into rotary conveyor by overflow relief outlet, delivers to and collects feed bin storage.Moisture percentage in sewage sludge about 30% after dry.
Step 8: sludge-drying is pulverized through pulverizer, obtained particle diameter 20-40 object dewatered sludge powder.
Step 9: bar mud powder mixes by a certain percentage with architecture sediment, sludge content 40-60%, and adds a small amount of additive, after mixing, sends into aging bunker ageing.
Step 10: ageing material stirs evenly through roller pair breaking crusher machine, biaxial rneader, by vacuum extruder extrusion molding, obtained adobe.
Step 11: tunnel furnace is sent in adobe, and drying, roasting make vitrified brick.Maturing temperature 900-1000 DEG C, roasting time 2 hours.Residual heat of tunnel kiln is utilized to carry out drying to wet adobe.
Should be understood that, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit, for a person skilled in the art, technical scheme described in above-described embodiment can be modified, or equivalent replacement is carried out to wherein portion of techniques feature; And these amendments and replacement, all should belong to the protection domain of claims of the present invention.

Claims (10)

1. municipal sludge is prepared biogas and is produced a method for vitrified brick, it is characterized in that, comprises the following steps:
A. sent in dry-type anaerobic fermentation tank by municipal sludge, and send into steam from steam boiler to dry-type anaerobic fermentation tank, municipal sludge carries out dry-type anaerobic fermentation, produces biogas and anaerobically fermenting mud after fermentation;
B. the modification of described anaerobically fermenting sludge conditioning is dewatered, send into drying installation and carry out drying and then carry out pulverizing and obtain dewatered sludge powder;
C. described dewatered sludge powder being mixed also extrusion molding with architecture sediment is adobe;
D. described adobe sent in making brick from sludge system, drying, roasting obtain vitrified brick;
Flue gas in described making brick from sludge system is simultaneously as the thermal source of steam boiler and drying installation, and the biogas produced after municipal sludge fermentation is as the heating fuel of making brick from sludge system.
2. municipal sludge according to claim 1 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: after municipal sludge mixes afforestation rubbish, then is admitted in dry-type anaerobic fermentation tank and carries out dry-type anaerobic fermentation.
3. municipal sludge according to claim 1 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: described anaerobically fermenting mud adopts belt filter press dehydration, and the anaerobically fermenting moisture percentage in sewage sludge after dehydration is down to less than 55%.
4. municipal sludge according to claim 1 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: after described anaerobically fermenting drying sludge, its moisture percentage in sewage sludge is down to less than 30%.
5. municipal sludge according to claim 4 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: the particle diameter of the dewatered sludge powder that dried anaerobically fermenting mud obtains after pulverizing is 20 ~ 40 orders.
6. municipal sludge according to claim 1 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: adopt roll crusher to carry out fragmentation after described dewatered sludge powder mixes with architecture sediment.
7. municipal sludge according to claim 1 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: described dewatered sludge powder mixes with architecture sediment, and wherein the weight percent of dewatered sludge powder is 40 ~ 60%.
8. municipal sludge according to claim 1 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: described dewatered sludge powder and architecture sediment adopt the extrusion molding of bipolar extrusion under vacuum machine.
9. municipal sludge according to claim 1 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: the leavening temperature of described dry-type anaerobic fermentation is 35 DEG C or 55 DEG C, fermentation period 25 ~ 30 days.
10. municipal sludge according to claim 1 is prepared biogas and is produced the method for vitrified brick, it is characterized in that: the maturing temperature of described adobe is 900 ~ 1000 DEG C.
CN201510251960.XA 2015-05-18 2015-05-18 Municipal sludge prepares biogas and produces the method for fired brick Active CN104843962B (en)

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Cited By (8)

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Publication number Priority date Publication date Assignee Title
CN105948445A (en) * 2016-06-30 2016-09-21 浙江环耀环境建设有限公司 Leather wastewater sludge treatment process
CN106699112A (en) * 2016-12-06 2017-05-24 广州市科恩电脑有限公司 Method for manufacturing bricks by utilizing building waste
CN107056238A (en) * 2017-04-10 2017-08-18 河南永泽环境科技有限公司 A kind of method of anaerobic sludge digestion biogas residue brickmaking
CN107721107A (en) * 2017-12-04 2018-02-23 祥达建设有限公司 One kind is used for municipal sludge treatment equipment and method
CN108101510A (en) * 2017-12-25 2018-06-01 合肥佳安建材有限公司 A kind of production method of sludge brick
CN109336554A (en) * 2018-12-18 2019-02-15 上海市建筑科学研究院 A kind of test simulation blank-making method using original state sludge baked brick
CN110668788A (en) * 2019-10-17 2020-01-10 湖北玉鑫新型墙材有限公司 Method for making bricks by using sludge wastewater
CN111848015A (en) * 2020-07-21 2020-10-30 蚌埠龙淮建筑科技有限公司 Method for preparing foaming wall material by using municipal sludge

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105948445A (en) * 2016-06-30 2016-09-21 浙江环耀环境建设有限公司 Leather wastewater sludge treatment process
CN105948445B (en) * 2016-06-30 2018-10-09 浙江环耀环境建设有限公司 A kind of leather waste water sludge treatment technique
CN106699112A (en) * 2016-12-06 2017-05-24 广州市科恩电脑有限公司 Method for manufacturing bricks by utilizing building waste
CN107056238A (en) * 2017-04-10 2017-08-18 河南永泽环境科技有限公司 A kind of method of anaerobic sludge digestion biogas residue brickmaking
CN107721107A (en) * 2017-12-04 2018-02-23 祥达建设有限公司 One kind is used for municipal sludge treatment equipment and method
CN108101510A (en) * 2017-12-25 2018-06-01 合肥佳安建材有限公司 A kind of production method of sludge brick
CN109336554A (en) * 2018-12-18 2019-02-15 上海市建筑科学研究院 A kind of test simulation blank-making method using original state sludge baked brick
CN110668788A (en) * 2019-10-17 2020-01-10 湖北玉鑫新型墙材有限公司 Method for making bricks by using sludge wastewater
CN111848015A (en) * 2020-07-21 2020-10-30 蚌埠龙淮建筑科技有限公司 Method for preparing foaming wall material by using municipal sludge

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Inventor after: Yang Xiaobing

Inventor after: Lu Zhe

Inventor after: Wang Chunxia

Inventor after: Wang Yanjie

Inventor after: Lu Shu

Inventor before: Yang Xiaobing