CN102503053B - Early-strength sludge modifier for landfill treatment and application thereof - Google Patents
Early-strength sludge modifier for landfill treatment and application thereof Download PDFInfo
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- CN102503053B CN102503053B CN 201110334032 CN201110334032A CN102503053B CN 102503053 B CN102503053 B CN 102503053B CN 201110334032 CN201110334032 CN 201110334032 CN 201110334032 A CN201110334032 A CN 201110334032A CN 102503053 B CN102503053 B CN 102503053B
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Abstract
The invention discloses an early-strength sludge modifier for landfill treatment and application thereof. The early-strength sludge modifier comprises carbide slag, magnesia, bentonite, polycarboxylic-acid water reducing agent and activator. The application of the early-strength sludge modifier comprises the following steps: mixing water-containing sludge and the early-strength sludge modifier in a certain proportion, and stirring until the water-containing sludge and the early-strength sludge modifier are completely mixed; and pressing the mixture with a plate and frame filter press under the pressure of 25-35Mpa. The early-strength sludge modifier disclosed by the invention is applicable to sludge with high water content, and has obvious curing effect and certain stabilizing effect; the carbide slag is used as one of the main raw materials of the modifier, thereby treating waste with waste; water is removed by pressing at normal temperature without consuming any outside heat source; the sludge modifier is prepared from the simple raw materials, is low at price, can eliminate odor while drying the sludge, and is beneficial to subsequent storage or landfill operation of sludge; and the compression strength is increased quickly, thereby being beneficial to the mechanical operation in the landfill process.
Description
Technical field
The present invention relates to sludge treatment and disposal field, relate in particular to a kind of agent of early-strength type sludge modification and application thereof that is applicable to landfill disposal.
Background technology
Along with the raising of expanding economy and quality of life, the public more and more pays close attention to environmental problem, to the also raising gradually of requirement of environmental quality.For the conserve water resource, improve the ecological environment, the sewage disposal cause fast development of China, the sludge quantity that produces in the sewage treatment process also increases day by day.The method that wastewater treatment is used always at present has physics method, chemical method, physico-chemical processes and biological process.Which kind of method of wastewater treatment all can produce throw out, particulate matter or floating matter etc. more or less, and these materials are referred to as mud.According to statistics, every year is only just discharged dewatered sludge about 2 * 10 in the municipal sewage plant by China
5T is in wet mud pact (3.8～5.5) * 10
6T.According to relevant prediction, China's municipal effluent amount also had than leap ahead in next two decades, and the year two thousand twenty dewatered sludge quantity discharged will reach 3.0 * 107 t/a(and calculate with water ratio 80%).Mud has become one of stern reality difficult problem of puzzlement sewage work.
Economic advantages such as the landfill disposal of solid waste relies on that it is constructed simply, construction investment province and running cost are low, many countries have obtained widespread use in the world, become the main flow disposal options that Developing country cities gives up admittedly.In the bigger developed country of area, also there are many countries to adopt the sanitary landfill method.According to China economic situation and the development in future trend of present stage, in considerable time from now on, landfill disposal remains China and handles one of most important method of municipal solid wastes.
The mud landfill is divided into independent landfill and mixes landfill.In Europe, dewatered sludge is many with municipal wastes mixing landfill, and in the U.S., the independent landfill of most employings.Mud can landfill depend on mud itself water ratio and soil mechanical properties.When the independent landfill of mud, the slip resistance of general requirement mud is not less than 80 ~ l00KN/m
2From economy and technology and since separately landfill to the having relatively high expectations of sludge quality and landfill yard, so, mix the main method that landfill will become China's sludge treatment in the several years.
The GB16889-2008 " household refuse landfill sites pollution control criterion " of State Environmental Protection Administration's issue came into effect on July 1st, 2008, had increased the moisture requirement of mud admission landfill disposal especially.So, sludge drying and to solidify be the first step of landfill disposal, this also makes sludge drying, be solidificated in whole mud landfill disposal is playing the part of more and more important role.
In existing sludge solidifying agent or the properties-correcting agent patent, partially modified dose of addition is bigger, and partially modified dose takes time and grow (generally more than 10h), also has partly solidified dose only to be applicable to that water ratio is at the mud below 60%.Mentioned a kind of sludge modification agent among the Chinese patent CN102167489A, this sludge modification agent comprises modification dolomite and magnesium chloride, but the sludge treatment that this invention proposes needs dilution.Therefore, present invention is directed at the mud of water ratio about 80 ~ 88%, develop and be applicable to the sludge modification agent that increases the mud early anti pressured intension, make mud after the modification can reach the soil mechanical properties requirement of landfill through mechanism filter-pressing, and treated mud is destitute of smell, and reached stabilization.
Summary of the invention
The objective of the invention is a kind of agent of early-strength type sludge modification and the utilisation technology scheme thereof that is applicable to landfill disposal at the problems referred to above proposition, this scheme is applicable to the properties-correcting agent of the quick mummification of dewatered sludge, curing and deodorizing that landfill yard is handled, problems such as water ratio height, soil mechanical properties difference when solving the mud landfill, make mud can reach the compression strength value of landfill yard fast, and can eliminate stench.
To achieve these goals, technical scheme of the present invention is:
A kind of early-strength type sludge modification agent that is applicable to landfill disposal, the agent of described early-strength type sludge modification comprises carbide slag, magnesia, wilkinite, polycarboxylate water-reducer, activator, and the ratio of weight and number of described stone electroslag, magnesia, wilkinite, polycarboxylate water-reducer, activator is:
Carbide slag 20 ~ 30
Magnesia 30 ~ 40
Wilkinite 15 ~ 25
Polycarboxylate water-reducer 10 ~ 20
Activator 0.5 ~ 10.
Further, the ratio of weight and number of described carbide slag, magnesia, wilkinite, polycarboxylate water-reducer, activator is:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Activator 5.
Further, described activator is one or more mixture of strong acid.
Further, described activator is one or more of highly basic.
Another object of the present invention is achieved through the following technical solutions:
A kind of application that is applicable to the early-strength type sludge modification agent of landfill disposal, described application may further comprise the steps:
(1) water-containing sludge and the agent of early-strength type sludge modification are mixed with certain proportion, be stirred to fully and mix;
(2) push under 25～35Mpa pressure with plate-and-frame filter press.
Further, the ratio of weight and number of described water-containing sludge and the agent of early-strength type sludge modification is 5 ~ 10:100.
The beneficial effect that compared with the prior art the present invention produces is:
1, be applicable to the mud of high-moisture percentage, solidification effect is obvious, and certain stabilization effect is arranged;
2, adopt carbide slag as one of properties-correcting agent main raw material, realized the treatment of wastes with processes of wastes against one another;
3, the contained contained magnesium ion of calcium ion, magnesia of carbide slag itself is exactly amendment and the modifying agent of soil; Polycarboxylate water-reducer also is a kind of soil-solidified-agent, acts synergistically between the various raw materials of the present invention, is conducive to the landfill yard mechanical work;
4, pass through extruding under the normal temperature with moisture removal, need not consume extraneous thermal source;
5, sludge modification agent of the present invention adopts simple raw material to make, and is cheap, can also eliminate stench in sludge drying, is beneficial to the operation of mud subsequent storage or landfill yard;
6, sludge water content is being reduced within the 2h below 55%, need not place for a long time, is conducive to continuous running;
7, ultimate compression strength increases comparatively fast, power operation when being beneficial to landfill.
Embodiment
Embodiment 1
A kind of early-strength type sludge modification agent that is applicable to landfill disposal, the agent of described early-strength type sludge modification comprises carbide slag, magnesia, wilkinite, polycarboxylate water-reducer, activator, and the ratio of weight and number of described stone electroslag, magnesia, wilkinite, polycarboxylate water-reducer, activator is:
Carbide slag 20 ~ 30
Magnesia 30 ~ 40
Wilkinite 15 ~ 25
Polycarboxylate water-reducer 10 ~ 20
Activator 0.5 ~ 10.
Early-strength type sludge modification of the present invention agent mainly is applicable to the mud of water ratio more than 80%.
Carbide slag is that the calcium carbide hydrolysis obtains behind the acetylene gas is the waste residue of main component with calcium hydroxide, and main component has CaO, CaS, Ca
3N
2, Ca
3P
2, Ca
2Si, Ca
3As
2And Ca (OH)
2Calcium hydroxide wherein has the good effect that has destroyed so-called in the mud " viscose glue phase region ".In order to obtain good effect, the carbide slag that obtains could add in the mud after at first needing to handle, otherwise just can not reach desirable effect, and carbide slag described in the present embodiment is powder, and particle diameter is 400 ~ 550 orders.
Magnesia has another name called causticity magnesia, magnesia, and its main component is magnesium oxide.Magnesia generally is raw material with the magnisite, forms at 800～850 ℃ of temperature lower calcinations, and be a kind of air-setting consolidating material of finely powdered, color has pure white, or greyish white, or closely faint yellow, and fresh material has scintillation glass gloss.Magnesia described in the present embodiment is powdery.
Wilkinite (Bentonite) be a kind of clay rock, also claim the montmorillonite clay rock, often contain a small amount of illite, kaolinite, halloysite, chlorite, zeolite, quartz, feldspar, calcite etc., be generally white, faint yellow, be light gray, light green, pink, brown red, brick red, grey black etc. again because iron-holder changes, have wax shape, earthy or oily luster.Loose as the soil that wilkinite has, what also have is fine and close hard; Main chemical compositions is silicon-dioxide, aluminium sesquioxide and water, also contains elements such as iron, magnesium, calcium, sodium, potassium.The chemical ingredients of montmorillonite is: (Al
2, Mg
3) Si
4O
10(OH)
2NH2O is because it has special nature such as swelling, cohesiveness, adsorptivity, catalytic, thixotropy, suspension and cationic exchange, so be widely used in each industrial circle.Wilkinite described in the present embodiment is powdery, and particle diameter is about 400 ~ 550 orders.
Polycarboxylate water-reducer is a kind of green additive with comb shaped molecular structure, and described polycarboxylate water-reducer mixes in the mud, can destroy the flucculation structure of mud granule, plays the effect that disperses mud granule.Open market product commonly used is the liquid dispersion phase, and solid content does not wait 10%, 20%, 40%, 50% usually.The solid content of the polycarboxylate water-reducer described in the present embodiment is 10%.
Activator in the present embodiment can be one or several mixture of strong acid, also can be one or several mixture of highly basic.Described strong acid can be hydrochloric acid, sulfuric acid, nitric acid etc., and described highly basic can be sodium hydroxide, potassium hydroxide etc.
During preparation, carbide slag, magnesia, wilkinite, polycarboxylate water-reducer, activator are got final product according to the portion rate mixing.
Under the condition that water exists, the calcium ion of sludge modification agent of the present invention, magnesium ion etc. can react with strong acid, highly basic and generate sal epsom, magnesium chloride, magnesium nitrate, calcium sulfate, calcium chloride, nitrocalcite, calcium hydroxide, magnesium hydroxide etc., and produce a large amount of heat during reaction, mud is played further oven dry effect, be conducive to the subsequent disposal of mud.Simultaneously, form crystal behind the calcium of sludge modification agent of the present invention, magnesium, the silicon plasma generation gelling reaction, crystal habit is mainly needle-like, long column shape, and cross connection reticulates structure mutually each other, thereby the mud after the use has very high physical strength.
Embodiment 2
Present embodiment is the improvement of carrying out on the basis of embodiment 1, the part identical with embodiment 1 in the present embodiment, please refer among the embodiment 1 disclosed content and understand, embodiment 1 disclosed content should not be repeated in this description as the content of present embodiment herein yet.
The ratio of weight and number of the carbide slag described in the sludge modification agent of the present invention, magnesia, wilkinite, polycarboxylate water-reducer, activator is:
Carbide slag 20
Magnesia 40
Wilkinite 15
Polycarboxylate water-reducer 20
Activator 0.5.
Embodiment 3
Present embodiment is the improvement of carrying out on the basis of embodiment 1, the part identical with embodiment 1 in the present embodiment, please refer among the embodiment 1 disclosed content and understand, embodiment 1 disclosed content should not be repeated in this description as the content of present embodiment herein yet.
The ratio of weight and number of the carbide slag described in the sludge modification agent of the present invention, magnesia, wilkinite, polycarboxylate water-reducer, activator is:
Carbide slag 30
Magnesia 30
Wilkinite 25
Polycarboxylate water-reducer 10
Activator 10.
Embodiment 4
Present embodiment is the improvement of carrying out on the basis of embodiment 1, the part identical with embodiment 1 in the present embodiment, please refer among the embodiment 1 disclosed content and understand, embodiment 1 disclosed content should not be repeated in this description as the content of present embodiment herein yet.
The ratio of weight and number of the carbide slag described in the sludge modification agent of the present invention, magnesia, wilkinite, polycarboxylate water-reducer, activator is:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Activator 5.
Embodiment 5
Present embodiment is the improvement of carrying out on the basis of embodiment 1, the part identical with embodiment 1 in the present embodiment, please refer among the embodiment 1 disclosed content and understand, embodiment 1 disclosed content should not be repeated in this description as the content of present embodiment herein yet.
Activator described in the sludge modification agent of the present invention is one or more mixture of strong acid.
In the sludge modification agent of the present invention each raw materials in part by weight ratio can for:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Nitric acid 5.
In the sludge modification agent of the present invention each raw materials in part by weight ratio can for:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Sulfuric acid 5.
In the sludge modification agent of the present invention each raw materials in part by weight ratio can for:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Hydrochloric acid 5.
In the sludge modification agent of the present invention each raw materials in part by weight ratio can for:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Hydrochloric acid 1
Sulfuric acid 1
Nitric acid 3.
Embodiment 6
Present embodiment is the improvement of carrying out on the basis of embodiment 1, the part identical with embodiment 1 in the present embodiment, please refer among the embodiment 1 disclosed content and understand, embodiment 1 disclosed content should not be repeated in this description as the content of present embodiment herein yet.
Activator described in the sludge modification agent of the present invention is one or more mixture of highly basic.
In the sludge modification agent of the present invention each raw materials in part by weight ratio can for:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Sodium hydroxide 5.
In the sludge modification agent of the present invention each raw materials in part by weight ratio can for:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Potassium hydroxide 5.
In the sludge modification agent of the present invention each raw materials in part by weight ratio can for:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Sodium hydroxide 1
Potassium hydroxide 4.
Embodiment 7
Present embodiment is the improvement of carrying out on the basis of embodiment 1, the part identical with embodiment 1 in the present embodiment, please refer among the embodiment 1 disclosed content and understand, embodiment 1 disclosed content should not be repeated in this description as the content of present embodiment herein yet.
A kind of embodiment 1 described application that is applicable to the early-strength type sludge modification agent of landfill disposal, described application may further comprise the steps:
(1) water-containing sludge and the agent of early-strength type sludge modification are mixed with certain proportion, be stirred to fully and mix; Described churning time is 10-15 minute, and described mixing process can be finished in kneader;
(2) push under 25～35Mpa pressure with plate-and-frame filter press.
Plate-and-frame filter press described in the present embodiment is commercially available general pressure filter, all can buy on the market.The plate-and-frame filter press that adopts in the present embodiment is the 800 template formula pressure filter that scape Tianjin pressure filter factory produces.
Embodiment 8
Present embodiment is the improvement of carrying out on the basis of embodiment 7, the part identical with embodiment 7 in the present embodiment, please refer among the embodiment 7 disclosed content and understand, embodiment 7 disclosed contents should not be repeated in this description as the content of present embodiment herein yet.
In the present embodiment, the ratio of weight and number of the water-containing sludge described in the embodiment 7 and the agent of early-strength type sludge modification is 5 ~ 10:100.
Embodiment 9
Present embodiment is the improvement of carrying out on the basis of embodiment 8, the part identical with embodiment 8 in the present embodiment, please refer among the embodiment 8 disclosed content and understand, embodiment 8 disclosed contents should not be repeated in this description as the content of present embodiment herein yet.
In the present embodiment, the ratio of weight and number of the water-containing sludge described in the embodiment 7 and the agent of early-strength type sludge modification is 5:100.
Get water ratio and be 86% the Sewage Plant dewatered sludge 1000kg of Beijing, add 50kg properties-correcting agent and fully mixing in kneader, after the plate-and-frame filter press extruding, moisture percentage in sewage sludge reduces to 51%, ultimate compression strength becomes 75Kpa, satisfies the requirement of mud landfill fully.Mixing machine in the present embodiment is the NH-4000 type kneader that the mechanical Manufacturing Co., Ltd of precious vacuum kneading of a specified duration produces.
Embodiment 10
Present embodiment is the improvement of carrying out on the basis of embodiment 8, the part identical with embodiment 8 in the present embodiment, please refer among the embodiment 8 disclosed content and understand, embodiment 8 disclosed contents should not be repeated in this description as the content of present embodiment herein yet.
In the present embodiment, the ratio of weight and number of the water-containing sludge described in the embodiment 7 and the agent of early-strength type sludge modification is 10:100.
Get water ratio and be 80% the Sewage Plant dewatered sludge 500kg of Beijing, add 50kg properties-correcting agent and fully mixing in kneader, after the plate-and-frame filter press extruding, moisture percentage in sewage sludge reduces to 54.3%, ultimate compression strength becomes 71Kpa, satisfies the requirement of mud landfill fully.
Claims (4)
1. early-strength type sludge modification agent that is applicable to landfill disposal, it is characterized in that: the agent of described early-strength type sludge modification comprises carbide slag, magnesia, wilkinite, polycarboxylate water-reducer, activator, and the ratio of weight and number of described stone electroslag, magnesia, wilkinite, polycarboxylate water-reducer, activator is:
Carbide slag 20 ~ 30
Magnesia 30 ~ 40
Wilkinite 15 ~ 25
Polycarboxylate water-reducer 10 ~ 20
Activator 0.5 ~ 10;
Wherein, described activator is one or more mixture of strong acid, or one or more of highly basic.
2. sludge modification agent according to claim 1 is characterized in that the ratio of weight and number of described carbide slag, magnesia, wilkinite, polycarboxylate water-reducer, activator is:
Carbide slag 25
Magnesia 35
Wilkinite 20
Polycarboxylate water-reducer 15
Activator 5.
3. the application of the described early-strength type sludge modification of claim 1 agent is characterized in that described application may further comprise the steps:
Water-containing sludge and the agent of early-strength type sludge modification are mixed with certain proportion, be stirred to fully and mix;
Push under 25～35Mpa pressure with plate-and-frame filter press.
4. the application of early-strength type sludge modification according to claim 3 agent is characterized in that the ratio of weight and number of described water-containing sludge and the agent of early-strength type sludge modification is 5 ~ 10:100.
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| CN103214155B (en) * | 2013-04-19 | 2014-05-28 | 湖州师范学院 | Sludge activator |
| CN105198367A (en) * | 2015-08-17 | 2015-12-30 | 广州市建筑科学研究院有限公司 | Curing agent capable of rapidly curing sludge at room temperature and use method thereof |
| CN112875832B (en) * | 2021-03-17 | 2022-08-23 | 辽宁工程技术大学 | Preparation method of alkaline slow-release material |
| CN112794591A (en) * | 2021-03-23 | 2021-05-14 | 深圳瑞新达新能源科技有限公司 | Composite sludge curing agent |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101456686A (en) * | 2007-12-10 | 2009-06-17 | 尹小林 | Novel industrial waste gypsum self forming energy-saving process |
| CN101381194A (en) * | 2008-09-27 | 2009-03-11 | 天津渤海环保工程有限公司 | Environment-friendly type sludge firming agent |
| CN102167489B (en) * | 2011-01-26 | 2012-11-28 | 郑建国 | Sludge treatment process |
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