CN105776782A - Method for solidifying and reducing domestic sludge - Google Patents
Method for solidifying and reducing domestic sludge Download PDFInfo
- Publication number
- CN105776782A CN105776782A CN201610211965.4A CN201610211965A CN105776782A CN 105776782 A CN105776782 A CN 105776782A CN 201610211965 A CN201610211965 A CN 201610211965A CN 105776782 A CN105776782 A CN 105776782A
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- Prior art keywords
- sludge
- mud
- solidifying agent
- curing
- solidification
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/06—Sludge reduction, e.g. by lysis
Abstract
The invention belongs to the technical field of environmental protection, relates to a sludge solidifying agent (MPC glue mud material) used for sludge solidification and a sludge solidification and reduction integrated method, and in particular relates to solidification on sludge with high water content and river way sludge in municipal wastewater treatment plants. The method comprises the following steps: taking 100g of domestic sludge with the water content of 94-95% in the wastewater treatment plant, and externally doping magnesium oxide and potassium dihydrogen phosphate with a certain mass fraction (accounting for the total weight of the sludge), wherein n(MgO/KH2PO4) is equal to 1/4-1/5, and silica fume is taken as an auxiliary material of the solidifying agent and accounts for 10-40% of dry gel in percentage by mass; and adding potassium dihydrogen phosphate and light calcined magnesia into the sludge according to certain proportion, uniformly stirring, then pouring mixture into a net paste die, and curing and moulding in the air, so that a sludge solidified body is obtained. The sludge solidifying agent product provided by the invention has the advantages that the water content of the sludge solidified body can be rapidly reduced to be less than 60%, the sludge volume is rapidly reduced by 30%, and the requirements on sanitary landfill of sludge or improvement of soil are met.
Description
Technical field
The invention belongs to environmental technology field, relate to a kind of sludge solidifying agent for solidification sludge and the method for sludge curing decrement integration, particularly relate to the solidification of municipal sewage plant high water content sludge and river sludge.
Background technology
Along with the raising of the fast development of urbanization and environmental requirement, treatment rate of domestic sewage improves year by year, and the thing followed is substantial amounts of sludge treatment problem.Mud is owing to it is bulky, complicated components, moisture content high, intensity is low, simultaneously possibly together with the harmful substance of the difficult degradations such as abundant organic matter, a large amount of pathogen, salt and heavy metal, and produce with stench, these unfavorable factors all bring inconvenience to its transport, storage and follow-up recycling.Therefore, the disposal that processes of current mud has become the significant problem that municipal wastewater treatment plant is encountered.
The main process method of disposal of current domestic mud first passes through the conditioning technology in advance of mud, the carrying out of mud is concentrated, nurses one's health, dehydration, stable, reduces the moisture content of mud.Owing to mud granule has highly hydrophilic and special flocculation structure, make mud physics and chemical property extremely unstable, intractability and processing cost are relatively big, therefore before the final disposal such as dry, burning, landfill, building materials, mud need to carry out a series of process to change its characteristic.Solidifying Decrement Technique is that a kind of curing materials with framing structure that adds in mud reduces mud high-moisture percentage, improve the rate of water loss of mud, improve its mechanical stability, reduce the volume of mud simultaneously, efficiently fix the noxious pollutants such as Heavy Metals in Sludge, solidify and the preconditioning technique of Decrement Technique integration.It is efficient mental retardation, simple to operate not only, and can fast and effeciently reduce the moisture content of mud, improve its mechanical stability, reduce the volume of mud, the pollutant such as Heavy Metals in Sludge can also be fixed simultaneously, reducing its environmental transport and transfer ability, this is that the final harmlessness disposing of mud provides prerequisite, it is contemplated that the solidification decrement integrated technique of mud will become one of Main Means of sludge pretreatment from now on.
Summary of the invention
In order to overcome deficiency of the prior art, the present invention provides the sludge solidifying agent that a kind of composition is simple and curing performance is excellent, and this firming agent mainly contains phosphate, light calcined magnesia and silicon ash.One of mainly solution problem is in that the many technical problems existing for existing sludge solidifying agent provide a kind of sludge solidifying agent for Treating Municipal Sewage treatment plant mud, this sludge solidifying agent can build framing structure, its moisture content of mud after solidification can be down to less than 60% within a short period of time, meets mud sanitary landfills or for improving the requirements such as soil.
The two of this firming agent solution problem are in that existing sludge solidifying agent makes sludge curing body curing time long, and this sludge solidifying agent has fast solidifying performance, it is possible to the moisture generation hydration reaction quickly and in mud, shortens cure cycle.
The present invention can be achieved through the following technical solutions.
A kind of sludge solidifying agent for Treating Municipal Sewage treatment plant mud as first aspect present invention, accounting for mud weight in wet base mass percent is 20～40%, wherein n (magnesium oxide/phosphate)=1/4～1/5, silicon ash is as the auxiliary material of firming agent, and its mass percent accounting for dry glue solidifying is 10%～40%.
Magnesium oxide belonging to wherein is light calcined magnesia, and described phosphate is potassium dihydrogen phosphate.
Method as a kind of sludge solidifying agent lignin-sludge for Treating Municipal Sewage treatment plant mud of the present invention, it is characterized in that, first, according to a certain ratio, it is that the sludge solidifying agent described in 20～40% joins in agitator by moisture content 94～95% sewage plant sludge and described moisture content 94～95% sewage plant sludge weight in wet base mass percent, then mix and blend is carried out, mixing time about 5 minutes, after stirring terminates, being poured into by stirred compound and only starch die for molding, after the demoulding, under room temperature, maintenance carries out after 1～7 day filling or for improving soil.
Compared with prior art, the present invention has advantage and effect:
1. present invention process is simple, easy to operate；
2. owing to the present invention is with light calcined magnesia, potassium dihydrogen phosphate and silicon ash for primary curing material, this firming agent can react with the moisture in mud, reduce sludge water content, and product can form framework material, moisture in mud is quickly discharged, in the moisture percentage in sewage sludge short time after solidification, is reduced to less than 60%；
3. this firming agent has fast solidifying performance, it is possible to shorten whole cure cycle；
4. this firming agent has the higher heat of hydration, it is possible to normal construction under subzero temperature environment (such as-10 DEG C) condition, it is ensured that make this firming agent environmental suitability higher；
5. municipal sewage sludge is after cured, the cured product (magnesium phosphate potassium) obtained is as a kind of multielement slow release fertilizer, containing nutrient necessary to potassium (K), phosphorus (P), magnesium (Mg) three plant growth, it may be achieved security landfill or soil resourceization utilize.And firming agent interpolation kind is few, processing cost is low, and Pollutant Treatment is comparatively thorough, therefore has higher environment and economic benefit.
Accompanying drawing explanation
Fig. 1 represents with the technology path of firming agent solidification sludge.
Fig. 2 represents the solidification effect that domestic sludge is solidified by different content firming agent.
Detailed description of the invention
The magnesium oxide used in the present invention can be through commercially available light-burned activated magnesia.Such as activity is the light calcined magnesia of more than 68, granularity be 100 orders to 200 orders, come from Wu Kuang Industrial Co., Ltd. of Liaoning Province.
The phosphate used in the present invention can be ammonium dihydrogen phosphate, potassium dihydrogen phosphate, diammonium phosphate etc..Potassium dihydrogen phosphate is selected in this experiment.
The sludge solidifying agent of the present invention can also contain other adjunct ingredient, for instance silicon ash, its weight is less than the 40% of firming agent weight.
Below by specific embodiment, this patent is described further.
Embodiment 1
Take the auxiliary element silicon ash in sludge of sewage treatment plant that moisture content is 94～95%, the sludge solidifying agent of mud weight in wet base 20% and firming agent, firming agent is added sequentially in mud and stirs 5min, then compound is being starched die for molding only, maintenance 1-7 days in atmosphere after the demoulding, obtain the sludge curing body of the present embodiment.Sludge solidifying agent each component mixes (n (magnesium oxide/phosphate)=1/4), magnesium oxide: 55.8% according to mass percent；Potassium dihydrogen phosphate: 44.2%；Silicon ash (accounting for xerogel): 30%.
The properties of the present embodiment material is as follows.
During age 3d, firming body moisture content 64.00%, increase-volume ratio is 0.90, and comprcssive strength is 0.41MPa.
During age 7d, firming body moisture content 25.70%, increase-volume ratio is 0.45, and comprcssive strength is 0.45MPa.
Embodiment 2
The sludge solidifying agent of the present embodiment formula and embodiment 1 identical, taking moisture content is the auxiliary element silicon ash in the sludge of sewage treatment plant of 94%-95%, the sludge solidifying agent of mud weight in wet base 30% and firming agent, firming agent is added sequentially in mud and stirs 5min, then compound is being starched die for molding only, maintenance 1-7 days in atmosphere after the demoulding, obtain the sludge curing body of the present embodiment.Sludge solidifying agent each component mixes (n (magnesium oxide/phosphate)=1/4) according to mass percent.
The properties of the present embodiment material is as follows.
During age 3d, firming body moisture content 53.47%, increase-volume ratio is 0.94, and comprcssive strength is 0.43MPa.
During age 7d, firming body moisture content 9.16%, increase-volume ratio is 0.59, and comprcssive strength is 0.53MPa.
Embodiment 3
Take the auxiliary element silicon ash in sludge of sewage treatment plant that moisture content is 94% ~ 95%, the sludge solidifying agent of mud weight in wet base 30% and firming agent, firming agent is added sequentially in mud and stirs 5min, then compound is being starched die for molding only, maintenance 1 ~ 7 day in atmosphere after the demoulding, obtain the sludge curing body (n (magnesium oxide/phosphate)=1/4) of the present embodiment, magnesium oxide: 55.8%；Potassium dihydrogen phosphate: 44.2%；Silicon ash (accounting for xerogel): 40%.
The properties of the present embodiment material is as follows.
During age 3d, firming body moisture content 65.92%, increase-volume ratio is 0.95, and comprcssive strength is 0.43MPa.
During age 7d, firming body moisture content 24.14%, increase-volume ratio is 0.71, and comprcssive strength is 0.65MPa.
Embodiment 4
Taking moisture content is the auxiliary element silicon ash in the sludge of sewage treatment plant of 94-95%, the sludge solidifying agent of mud weight in wet base 30% and firming agent, firming agent is added sequentially in mud and stirs 5min, then by compound molding in a mold, maintenance 1 ~ 7 day in atmosphere after the demoulding, obtains the sludge curing body of the present embodiment.Sludge solidifying agent each component mixes (n (magnesium oxide/phosphate)=1/5), magnesium oxide: 61% according to mass percent；Potassium dihydrogen phosphate: 39%；Silicon ash (accounting for xerogel): 30%.
The properties of the present embodiment material is as follows.
During age 3d, firming body moisture content 64.98%, increase-volume ratio is 0.89, and comprcssive strength is 0.22MPa.
During age 7d, firming body moisture content 20.10%, increase-volume ratio is 0.67, and comprcssive strength is 0.45MPa.
The mechanism of action of the firming agent of the present invention is: in municipal sludge, bed mud solidification process, and firming agent mainly contains two kinds of effective ingredient, and after MKP powder mixes with water, potassium dihydrogen phosphate dissolves rapidly in water and ionizing generates K+、H+And PO3 4-, after magnesium oxide powder is subject to water and hydrionic attack, particle surface dissolves and generates Mg2+, dissociate the Mg2+With K+And PO3 4-Effect forms a kind of unbodied magnesium-potassium phosphate complex hydrated gel, MgKPO4·6H2It is considered as topmost product that O (is commonly called as guanite), and along with the carrying out of reaction, product is crystallization gradually.Owing in system, magnesium oxide is superfluous, the product of precipitation just covers magnesium oxide grain in surface, and forms one layer of hydrated product film magnesia particle closely connects to one.Silicon ash is the synthesis result such as water-reduction, compaction and homogenization, and silicon ash particle is filled in hydrated product, and granule and other hydrated products combine preferably.So, under hydrated product effect, whole system condenses gradually and hardens.And cross-connection reticulates structure each other, shorten hardening time, for moisture content about 94% mud and bed mud, when the interpolation weight of firming agent is 30%, hardening time, less than 3 days, can meet Sludge landfill requirement.
In sum, the firming agent of the present invention is compared with other conventional solidified dose, and the composition in firming agent is different, and has the advantage that
(1) hardening time is short, it is possible in a short time, for instance 72 hours, makes mud solidify, and reaches landfill requirement；
(2) add weight few, normally only need to add with the weight proportion of 20% to 30%；And volume reduction amount is big, the volume being typically in curing period sludge curing body reduces 30%；And the pH of mud is changed less, the generation of foul smell can be suppressed simultaneously；
(3) belong to the sludge conditioner of a kind of green, mud is not caused secondary pollution, and the performance of mud can be improved, promote the stabilisation of mud；
(4) solidification process simplifies, it is easy to produce and construction；
(5) the moisture generation hydration reaction in firming agent and mud, generates magnesium phosphate potassium Binder Materials, and this product is purer pollution-free, and can as a kind of slow-release fertilizer, containing nutrients such as potassium (K), phosphorus (P), it is possible to improve soil, afforestation etc..
Claims (5)
1. the method for the sludge solidifying agent of a solidification sludge and the integration of sludge curing decrement, it is characterized in that: the domestic sludge 100g of sewage treatment plant's moisture content 94% ~ 95%, mix outward light calcined magnesia and the potassium dihydrogen phosphate of certain mass mark (accounting for mud gross weight), potassium dihydrogen phosphate is added to after mud stirs, add light calcined magnesia, auxiliary material silicon ash mix homogeneously, then compound is poured into die for molding, maintenance in air.
2. the method for sludge solidifying agent according to claim 1 and the integration of sludge curing decrement, it is characterized in that: the outer mass fraction (accounting for mud gross weight) of mixing of MPC Binder Materials is 20 ~ 40%, the outer mass fraction (accounting for xerogel gross weight) of mixing of silicon ash is 10 ~ 40%, and amount of substance ratio (M: P) of magnesium oxide and potassium dihydrogen phosphate is 4: 1 ~ 5: 1.
3. the method for sludge solidifying agent according to claim 1 and the integration of sludge curing decrement, it is characterised in that: the magnesium oxide used by this patent product is technical grade light calcined magnesia.
4. the method for described sludge solidifying agent according to claim 1 and the integration of sludge curing decrement, it is characterised in that: this patent product curing condition is maintenance in air.
5. the method for described sludge solidifying agent according to claim 1 and the integration of sludge curing decrement, it is characterized in that: used by this patent product, sludge solidifying agent can build framing structure, its moisture content of mud after solidification can be down to less than 60% within a short period of time, volume reduces 30%, meets mud sanitary landfills or for improving the requirements such as soil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610211965.4A CN105776782A (en) | 2016-04-07 | 2016-04-07 | Method for solidifying and reducing domestic sludge |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610211965.4A CN105776782A (en) | 2016-04-07 | 2016-04-07 | Method for solidifying and reducing domestic sludge |
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| CN105776782A true CN105776782A (en) | 2016-07-20 |
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| CN201610211965.4A Pending CN105776782A (en) | 2016-04-07 | 2016-04-07 | Method for solidifying and reducing domestic sludge |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106892546A (en) * | 2017-03-13 | 2017-06-27 | 江苏中宜生态土研究院有限公司 | A kind of admittedly steady method of disposal of combined pollution riverbed sludge |
| CN107285581A (en) * | 2017-07-25 | 2017-10-24 | 云南大地绿坤环保科技有限公司 | A kind of processing method of multivalent state dreg containing arsenic |
| CN107555822A (en) * | 2017-09-07 | 2018-01-09 | 深圳大学 | A kind of sludge base potassium magnesium phosphate cement and preparation method thereof |
| CN108328905A (en) * | 2018-03-21 | 2018-07-27 | 深圳市鸿卓环保科技有限公司 | A kind of sludge dehydration conditioner and its application method |
| CN110255836A (en) * | 2019-06-05 | 2019-09-20 | 路德环境科技股份有限公司 | Composition and sludge curing method for rapid curing municipal sludge |
| CN110255840A (en) * | 2019-07-19 | 2019-09-20 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | A kind of novel water course/lake sludge curing system and sludge curing method |
| CN110818210A (en) * | 2019-11-11 | 2020-02-21 | 河北诚润环保工程有限公司 | Municipal sludge solidification ecological treatment process |
| CN110862202A (en) * | 2019-11-25 | 2020-03-06 | 济南大学 | Sludge curing agent, soil water-retaining and fertilizer-increasing agent, and preparation method and use method thereof |
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| CN101638311A (en) * | 2009-07-10 | 2010-02-03 | 北京古华建业淤泥固化科技有限公司 | Slit and sludge curing agent |
| CN103289703A (en) * | 2013-07-05 | 2013-09-11 | 浙江工业大学 | Early-strength soil solidifying agent and manufacturing method and application for same |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101381220A (en) * | 2008-10-16 | 2009-03-11 | 上海交通大学 | Multifunctional gelation material |
| CN101638311A (en) * | 2009-07-10 | 2010-02-03 | 北京古华建业淤泥固化科技有限公司 | Slit and sludge curing agent |
| CN103289703A (en) * | 2013-07-05 | 2013-09-11 | 浙江工业大学 | Early-strength soil solidifying agent and manufacturing method and application for same |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106892546A (en) * | 2017-03-13 | 2017-06-27 | 江苏中宜生态土研究院有限公司 | A kind of admittedly steady method of disposal of combined pollution riverbed sludge |
| CN106892546B (en) * | 2017-03-13 | 2020-05-08 | 江苏中宜生态土研究院有限公司 | Composite pollution river and lake bottom mud stabilization treatment method |
| CN107285581A (en) * | 2017-07-25 | 2017-10-24 | 云南大地绿坤环保科技有限公司 | A kind of processing method of multivalent state dreg containing arsenic |
| CN107555822A (en) * | 2017-09-07 | 2018-01-09 | 深圳大学 | A kind of sludge base potassium magnesium phosphate cement and preparation method thereof |
| CN108328905A (en) * | 2018-03-21 | 2018-07-27 | 深圳市鸿卓环保科技有限公司 | A kind of sludge dehydration conditioner and its application method |
| CN110255836A (en) * | 2019-06-05 | 2019-09-20 | 路德环境科技股份有限公司 | Composition and sludge curing method for rapid curing municipal sludge |
| CN110255840A (en) * | 2019-07-19 | 2019-09-20 | 哈尔滨工业大学水资源国家工程研究中心有限公司 | A kind of novel water course/lake sludge curing system and sludge curing method |
| CN110818210A (en) * | 2019-11-11 | 2020-02-21 | 河北诚润环保工程有限公司 | Municipal sludge solidification ecological treatment process |
| CN110862202A (en) * | 2019-11-25 | 2020-03-06 | 济南大学 | Sludge curing agent, soil water-retaining and fertilizer-increasing agent, and preparation method and use method thereof |
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