CN101914404B - Method for preparing solid fuel from sludge of sewage treatment plant - Google Patents
Method for preparing solid fuel from sludge of sewage treatment plant Download PDFInfo
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- CN101914404B CN101914404B CN2010102579472A CN201010257947A CN101914404B CN 101914404 B CN101914404 B CN 101914404B CN 2010102579472 A CN2010102579472 A CN 2010102579472A CN 201010257947 A CN201010257947 A CN 201010257947A CN 101914404 B CN101914404 B CN 101914404B
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- sludge
- mud
- destructive distillation
- solid fuel
- mud cake
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
- Y02P20/133—Renewable energy sources, e.g. sunlight
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Treatment Of Sludge (AREA)
Abstract
The invention discloses a method for preparing a solid fuel from sludge of a sewage treatment plant, which comprises the following steps of: (1) pretreating the sludge; and (2) preparing the solid fuel from a filter cake. The method has the advantages that: (1) the sludge of the sewage treatment plant is pretreated, so that the water content of the sludge is obviously reduced, heavy metal is effectively removed from wet sludge and a precondition is created for the utilization of the sludge; (2) the pretreated sludge is subjected to dry distillation by using solar energy, which is environmental-friendly technology, so that the operating cost of the process is reduced; and (3) a dry distillation product has low heavy metal content and large heating value which is more than or equal to 20,000KJ/Kg, and the product is a high-quality solid fuel.
Description
Technical field
The present invention relates to a kind of method with preparing solid fuel from sludge of sewage treatment plant.
Background technology
Mud refers to the primary deposition mud, residual active sludge, humus sludge, digested sludge and the chemical sludge that produce not comprise grid grid slag, scum silica frost and settling pit sand setting in sewage treatment process.Contain nutrient for plants nitrogen, phosphorus, potassium and organism and moisture etc. in the mud, also contain a large amount of hazardous and noxious substances, such as parasitic ovum, pathogenic micro-organism, bacterium, synthesis of organic substance and heavy metal ion; In addition, mud is easy to degenerate smelly, and particle is thinner, and relative density is less, and water ratio is high and be difficult for dehydration, belongs to the hydroaropic substance of gel-like texture, and its any stacking can be caused secondary pollution.Sewage work is landfill to the main method of sludge treatment at present, and landfill is mainly taked dual mode: a kind of is to pay to refuse landfill, is disposed by the refuse tip landfill; The 2nd, the landfill of digging pit with putting, cost is large, waste land resources.Mud itself contains a large amount of available resources, and landfill method is the huge waste to available stock.
Organism in the mud contains a large amount of potential energies, and the superior calorific value of its dry-matter can reach 15000KJ/Kg～20000KJ/Kg, can be used for preparing fuel.Prepare fuel with mud, synthol method and Direct thermochemical liquefaction method are mainly adopted in existing research.Because water ratio is generally up to about 80% in the dewatered sludge, above-mentioned two kinds of methods do not solve the predrainage problem, and the water in the mud is with lot of energy.Therefore, if can solve the problems such as mud predrainage and removal heavy metal, prepare solid fuel with mud and will have good environmental benefit and economic benefit.
Summary of the invention
The purpose of this invention is to provide a kind of method with preparing solid fuel from sludge of sewage treatment plant.
The objective of the invention is to realize in the following way: a kind of method with preparing solid fuel from sludge of sewage treatment plant is characterized in that:
(1) sludge pretreatment: get the wet mud of sewage work behind mechanical dehydration, by the volume mass of water and wet mud than (L/Kg) 0.5～1: 1 adds entry, the volume mass of pressing technical grade sulfuric acid (mass concentration 93%～98%) and wet mud adds sulfuric acid than (L/Kg) 5～20: 1000, volume mass by technical grade hydrogen peroxide (mass concentration is 27.5%～35%) and wet mud adds hydrogen peroxide than (L/Kg) 10～50: 1000, the sludge slurry that has added sulfuric acid and hydrogen peroxide is stirred and is heated to 45 ℃～95 ℃, mud is carried out pre-treatment, pretreatment time 5min～90min.After the pre-treatment sludge slurry is filtered and washes with water, the washing water consumption is 1～4: 1 with the volume mass of wet mud than (L/Kg), gets mud cake and filtrate behind the filtration washing;
(2) mud cake prepares solid fuel: with lime powder the pH value of mud cake is adjusted to 6.5～7.5, the mud cake of having regulated the pH value packed into carry out destructive distillation in the destructive distillation tank, the required thermal source of destructive distillation is being equipped with the focusing sunlight direct radiation on the destructive distillation tank of mud cake for the sun power with convex lens focus sunlight gained.When the moisture content of the destructive distillation product in the destructive distillation tank less than 1.0% the time, the expression destructive distillation is finished, and takes out the destructive distillation product, its calorific value is a kind of high-quality solid fuel more than or equal to 20000KJ/Kg.
The present invention has following beneficial effect: (1) by carrying out pre-treatment to sludge of sewage treatment plant, can make that water ratio significantly reduces in the mud, and effectively remove the heavy metal in the wet mud, is that precondition is created in the utilization of mud; (2) utilizing sun power that pretreated mud is carried out destructive distillation, is a kind of eco-friendly green technology, has reduced the running cost of technological process; (3) heavy metal content is low in the destructive distillation product, and thermal value is larger, and calorific value is a kind of solid fuel of high-quality more than or equal to 20000KJ/Kg.
Description of drawings
Fig. 1 is basic flowsheet of coal preparation of the present invention.
Embodiment
The invention will be further described below in conjunction with embodiment.
Embodiment 1 mud sample is taken from Xiangtan, Hunan Province city sewage work, and sample is the excess sludge after dewatering, and water ratio is 80.5%, and solid content is 19.5%.Composition analysis such as the table 1 of sample for analysis after being dried to constant weight under 105 ℃.
The composition analysis (mg/Kg) of table 1 mud sample (butt)
Get wet mud 10Kg, add water 10L, the technical grade sulfuric acid 0.1L that adds mass concentration 98%, add the technical grade hydrogen peroxide 0.3L of mass concentration 30%, sludge slurry is heated to 75 ℃, stir 60min, filter and use the 20L water washing, get mud cake and filtrate, mud cake quality 3.53K g, filtrate volume 36.5L; Mud cake is regulated pH value to 7.0 with lime powder, then mud cake is packed in the destructive distillation tank made from the thick aluminium sheet of 1mm, be the convex lens focus sunlight of 200mm with diameter, the focusing sunlight direct radiation is carried out destructive distillation to mud cake on the destructive distillation tank, after destructive distillation is finished, take out the destructive distillation product, the destructive distillation quality product is 1.24Kg, wherein moisture content 0.5%, calorific value 21500KJ/Kg, heavy metal detected result such as table 2; Filtrate is regulated pH value to 7.0 with lime, adds 5g technical grade CaS, filters, and gets waste residue and clear liquid, and clear liquid returns sewage work, contains heavy metal in the waste residue, and the specialized company of giving qualification processes.Heavy metal detected result such as table 3 in the clear liquid.
The heavy metal composition analysis (mg/Kg) of table 2 destructive distillation product
| Composition | Hg | Cd | Cr | As | Zn | Cu | Ni | Pb |
| Content | 0.5 | 0.2 | 5.5 | 1.0 | 4.8 | 3.2 | 0.8 | 85 |
Heavy metal composition analysis (mg/L) in table 3 clear liquid
| Composition | Hg | Cd | Cr | As | Zn | Cu | Ni | Pb |
| Content | 0.5 | 1.5 | 3.6 | 0.1 | 18.0 | 0.1 | 1.5 | 0.1 |
Embodiment 2 mud samples are taken from sewage work of yueyang, hunan city petrochemical corporation (complex), and sample is the excess sludge after dewatering, and water ratio is 78.5%, and solid content is 21.5%.Composition analysis such as the table 4 of sample for analysis after being dried to constant weight under 105 ℃.
The composition analysis (mg/Kg) of table 4 mud sample (butt)
Get wet mud 5Kg, add water 5L, the technical grade sulfuric acid 0.075L that adds mass concentration 93%, add the technical grade hydrogen peroxide 0.15L of mass concentration 35%, sludge slurry is heated to 95 ℃, stir 60min, filter and use the 10L water washing, get mud cake and filtrate, mud cake quality 1.78Kg, filtrate volume 18.24L; Mud cake is regulated pH value to 7.0 with lime powder, then mud cake is packed in the destructive distillation tank made from the thick aluminium sheet of 1mm, be the convex lens focus sunlight of 200mm with diameter, the focusing sunlight direct radiation is to heat up in a steamer on the tank mud cake is carried out destructive distillation, after destructive distillation is finished, take out the destructive distillation product, the destructive distillation quality product is 0.655Kg, wherein moisture content 0.8%, calorific value 20500KJ/Kg, heavy metal detected result such as table 5; Filtrate is regulated pH value to 7.2 with lime, adds 0.3g technical grade CaS, filters, and gets waste residue and clear liquid, and clear liquid returns sewage work, contains heavy metal in the waste residue, and the specialized company of giving qualification processes.Heavy metal detected result such as table 6 in the clear liquid.
The heavy metal composition analysis (mg/Kg) of table 5 destructive distillation product
| Composition | Hg | Cd | Cr | As | Zn | Cu | Co |
| Content | 0.1 | 0.2 | 8.5 | 0.1 | 1.5 | 0.5 | 1.5 |
Heavy metal composition analysis (mg/L) in table 6 clear liquid
| Composition | Hg | Cd | Cr | As | Zn | Cu | Co |
| Content | 0.1 | 0.1 | 5.5 | 0.1 | 5.0 | 0.1 | 0.5 |
Claims (1)
1. method with preparing solid fuel from sludge of sewage treatment plant is characterized in that:
(1) sludge pretreatment: get the wet mud of sewage work behind mechanical dehydration, volume mass by water and wet mud adds entry than L:Kg=0.5 ~ 1:1, being 93% ~ 98% technical grade sulfuric acid by mass concentration adds sulfuric acid with the volume mass of wet mud than L:Kg=5 ~ 20:1000, being 27.5% ~ 35% technical grade hydrogen peroxide by mass concentration adds hydrogen peroxide with the volume mass of wet mud than L:Kg=10 ~ 50:1000, the sludge slurry that has added sulfuric acid and hydrogen peroxide is stirred and is heated to 45 ℃ ~ 95 ℃, mud is carried out pre-treatment, pretreatment time 5min ~ 90min; After the pre-treatment sludge slurry is filtered and washes with water, the washing water consumption is L:Kg=1 ~ 4:1 with the volume mass ratio of wet mud, gets mud cake and filtrate behind the filtration washing;
(2) mud cake prepares solid fuel: with lime powder the pH value of mud cake is adjusted to 6.5 ~ 7.5, the mud cake of having regulated the pH value packed into carry out destructive distillation in the destructive distillation tank, the required thermal source of destructive distillation is being equipped with the focusing sunlight direct radiation on the destructive distillation tank of mud cake for the sun power with convex lens focus sunlight gained; When the moisture content of the destructive distillation product in the destructive distillation tank less than 1.0% the time, destructive distillation is finished, and takes out the destructive distillation product, gets solid fuel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102579472A CN101914404B (en) | 2010-08-20 | 2010-08-20 | Method for preparing solid fuel from sludge of sewage treatment plant |
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| CN2010102579472A CN101914404B (en) | 2010-08-20 | 2010-08-20 | Method for preparing solid fuel from sludge of sewage treatment plant |
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| CN101914404A CN101914404A (en) | 2010-12-15 |
| CN101914404B true CN101914404B (en) | 2013-04-10 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102491608B (en) * | 2011-11-29 | 2013-05-01 | 曾秀仪 | Production method of sludge biomass environment-friendly fuel |
| CN102533381A (en) * | 2012-02-09 | 2012-07-04 | 湖北鼎鑫环保科技有限公司 | Method for preparing fuel by using sludge |
| CN104194861B (en) * | 2014-06-18 | 2016-11-02 | 叶绍朋 | Sludge of sewage treatment plant low combustion value anthracite synthesizes |
| CN104108844B (en) * | 2014-08-06 | 2015-11-18 | 重庆远达水务有限公司 | A kind of municipal sludge prepares the method for fuel |
| CN104449860B (en) * | 2014-11-30 | 2017-02-01 | 东北电力大学 | Solar heat collection pre-processing and gasified tar comprehensive utilization process and device used for biomass compression |
| CN105000786B (en) * | 2015-08-26 | 2017-04-19 | 四川瑞天环境工程有限公司 | Drug and treatment process for deep dehydration on sludge |
| CN106893617A (en) * | 2015-12-18 | 2017-06-27 | 远东科技大学 | Organic sludge and waste edible oil conformability processing method, derivative fuel, feed additive |
| CN107954620A (en) * | 2017-12-12 | 2018-04-24 | 安徽宇瑞环保建设有限公司 | A kind of Application way to sludge in sewage treatment plant |
Citations (5)
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|---|---|---|---|---|
| CN1304890A (en) * | 2000-11-21 | 2001-07-25 | 中国石油天然气股份有限公司乌鲁木齐石化分公司 | Three-phase separation process for oily mud in oil refinery |
| CN1445031A (en) * | 2002-03-15 | 2003-10-01 | 林裕城 | Recycling handles method for dirty mire containing heavy metals |
| CN1693242A (en) * | 2005-05-12 | 2005-11-09 | 万若（北京）环境工程技术有限公司 | Process for treating sludge by dewatering and stabilizing |
| CN101216243A (en) * | 2008-01-09 | 2008-07-09 | 浙江大学 | System for drying sludge by solar energy |
| CN101318759A (en) * | 2008-07-11 | 2008-12-10 | 谢忠诚 | Resource regeneration processing method and equipment for urban sewage sludge |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01315000A (en) * | 1988-06-16 | 1989-12-20 | Toshiba Corp | Treatment of radioactive sludge |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1304890A (en) * | 2000-11-21 | 2001-07-25 | 中国石油天然气股份有限公司乌鲁木齐石化分公司 | Three-phase separation process for oily mud in oil refinery |
| CN1445031A (en) * | 2002-03-15 | 2003-10-01 | 林裕城 | Recycling handles method for dirty mire containing heavy metals |
| CN1693242A (en) * | 2005-05-12 | 2005-11-09 | 万若（北京）环境工程技术有限公司 | Process for treating sludge by dewatering and stabilizing |
| CN101216243A (en) * | 2008-01-09 | 2008-07-09 | 浙江大学 | System for drying sludge by solar energy |
| CN101318759A (en) * | 2008-07-11 | 2008-12-10 | 谢忠诚 | Resource regeneration processing method and equipment for urban sewage sludge |
Non-Patent Citations (1)
| Title |
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