CN101397181A - Inorganic composite conditioner and sludge dewatering method thereof - Google Patents
Inorganic composite conditioner and sludge dewatering method thereof Download PDFInfo
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- CN101397181A CN101397181A CNA2008100488255A CN200810048825A CN101397181A CN 101397181 A CN101397181 A CN 101397181A CN A2008100488255 A CNA2008100488255 A CN A2008100488255A CN 200810048825 A CN200810048825 A CN 200810048825A CN 101397181 A CN101397181 A CN 101397181A
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- mud
- sludge
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- dehydration
- composite conditioner
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Abstract
The invention discloses an inorganic composite conditioner and a method for dehydrating the sludge thereof. The inorganic composite conditioner for dehydrating sludge comprises fly ash and calces, wherein, the weight percent of the fly ash is 17-75%, and the left is calces. For the optimized improvement, the weight percent of fly ash is 37.5-64%. The dehydration method comprises the following steps: (1) adjusting quality: the inorganic composite conditioner with right amount is weighted and is added in the sludge for evenly stirring, and the weight percent of the added inorganic composite conditioner is 6-20%; (2) dehydration: the sludge mixing liquid which is stirred evenly after adjusting quality is dehydrated mechanically. The water content rate of mud cake after dehydrating the sludge can be decreased to 45-60%. The specific resistance of the sludge is decreased to 10<6>-10<7>S<2>/g. The beneficial effects of the invention are that the effect of dehydration is good, time of dehydration is short, industrial waste residue can be utilized effectively, after dehydration, the mud cake can be taken as the raw material for preparing construction material.
Description
Technical field
The invention belongs to the urban domestic sewage sludge processing technology field, be specifically related to utilize inorganic conditioner that mud is carried out processed.
Background technology
Mud is the inevitable outcome that city domestic sewage is handled, and contains a large amount of organism, the water ratio height, perishable the intensive stink is arranged, and also contains objectionable impuritiess such as heavy metal, pathogenic bacterium, pathogenic bacteria.Along with the popularizing and promoting of sewage disposal, the generation of mud is increasing, and the safety of mud, health handling problems are outstanding day by day.The processing of mud has become a bottleneck problem that needs to be resolved hurrily with disposal.
At present, mud mainly contains sanitary landfill, compost is agricultural and burning etc.No matter be burning, landfill or compost recycling, the high-moisture percentage of mud all is the critical limitation factor.The moisture percentage in sewage sludge that general second pond is discharged is up to 98% even 99%, through moisture percentage in sewage sludge after the concentration also about 97%.The mud resistivity is the composite target of expression sludge filtration characteristic, and its physical significance is: the resistance the when mud of unit mass filters under certain pressure on the unit filtration area.The effect of resistivity is the strainability of more different mud (or same mud add mixtures of different amounts after).The mud resistivity is bigger, and strainability is poorer.It is generally acknowledged that resistivity is 10
9-10
10s
2The mud of/g be can be regarded as difficult filtering mud, and resistivity is in (0.5-0.9) * 10
9s
2The mud of/g be can be regarded as medium, and resistivity is less than 0.4 * 10
9s
2The mud of/g filters easily.
Dehydrating and conditioning agent commonly used both at home and abroad is a chemical amendment, mainly be organic and inorganic macromolecule compounds such as poly-propionic acid amide, poly-iron, poly-aluminium, the quality of conditioning effect and dosing kind and quality, added amount of chemical and environmental factors have substantial connection, the water ratio of concentration basin mud mud cake after dewatering has increased the cost input of mud subsequent disposal more than 75%.The present most mud of China through gravity concentrate, after a series of art breading of mechanical dehydration, its water ratio still has 70-80%.And the sludge dewatering treatment facility investment commonly used of this cover accounts for 30-40% of sewage work's gross investment, and working cost accounts for 20-50% of sewage work's overall running cost.
The sludge dewatering amendment of seeking Cheap highly effective is a technical barrier of present sludge disposal and resource utilization.At present, the main patent documentation aspect the amendment of sludge dewatering is as follows.
Chinese patent literature " method of modifying in a kind of sludge handling process and application thereof " (publication number CN1693242A) is that amendment processing water ratio is 70-80% mud with sulfurous iron ore or flyash, add dry back water ratio and be 5-8% dried mud in modified whipping process, it is that 30-35% mud is discharged that mud is adjusted to water ratio.Gained sludge dewatering is easy, is applied to brickmaking, can prevent to occur surperficial drawing crack phenomenon in the brick-bank drying course, improves the quality of adobe.This method process object is that the water ratio behind the process mechanical dehydration is 70-80% mud.
Chinese patent literature " sludge dewatering and stabilization treatment method " (publication number CN1693242A, open day on November 9th, 2005) relate to a kind of sludge dewatering and stabilization treatment method, by being 75-82% mud heat drying to water ratio and in mud, adding alkaline pulverulent material calcium oxide powder two step process, mud is dewatered and stabilization treatment.The alkalescence pulverulent material is calcium oxide powder, sodium oxide powder, magnesia powder, magnesium oxychloride, can also add some industrial residue alkalescence meals, as flyash, industrial dust etc.This method can obtain the lower mud of water ratio, and process object also is to be about 80% mud through water ratio behind the mechanical dehydration.
Be that raw material makes a kind of high-efficiency dehydration amendment in the agent of inorganic polymer dehydrating and conditioning, the agent of organic polymer dehydrating and conditioning, lime powder (CaO) in the Chinese patent literature " mud high-efficiency dehydration amendment " (publication number CN1621371, open day on June 1st, 2005).Its compound weight is counted: 40-90 parts of inorganic polymer dehydrating and conditioning agent, 0.5-12 parts of organic polymer dehydrating and conditioning agent, 5-55 parts of lime powders (CaO meter).Shortcoming is dehydrating and conditioning agent treatment effect when better, organic polymer dehydrating and conditioning agent content height, and cost is higher; Follow-up mud mud cake utilizes difficulty again.
Chinese patent literature " chemical amendment of sludge dewatering and dewatering thereof " (publication number CN1986788, open day on June 27th, 2007) be chemical amendment with molysite, calcium salt or calcium oxide in, it is modified earlier mud to be added water, add molysite earlier in the mud after modified then, addition is 0.2-1.5% of a mud, and stirs 1-6 minutes; Add calcium salt and/or calcium oxide again, addition is 1-4.5% of a mud, and stirs 2-8 minutes.At last modified good mud is carried out positive press-dehydrating, dwell pressure 1.0-2.0MPa, the dwell time is a release blowing after 45-90 minutes, the water ratio of malleation dehydrated sludge is 50-60%.The chemical amendment that adopts mainly is molysite, calcium salt or calcium oxide, and is that substep adds, complex process, and still more than 50%, effect is general for the dehydrated sludge water ratio.
Chinese patent literature " high-effective composite filter aid and the application method thereof that are used for sludge dewatering " (publication number CN101182095, open day on May 21st, 2008) disclose a kind of high-effective composite filter aid of sludge dewatering in, its feed composition and weight percent content are: Al
2O
320-30%, SiO
240-55%, CaO 2-8%, wilkinite 3-13%, iron powder 4-10%; Can add Fe on this basis
2O
33-10%, MgO 0.6-2%, K
2O 1-2.5%, Na
2O 0.1-0.7%.The adding mass percent is 2-6% high-effective composite filter aid in the mud of post precipitation, and water ratio can reduce to 40-50%.Its process object is a thickened sludge, and the composition of composite filter aid comprises 9 kinds more than, complicated process of preparation.
Summary of the invention
The object of the present invention is to provide a kind of inorganic composite conditioner and mud dewatering method thereof, utilize this inorganic composite conditioner, can make the sludge dewatering pretreating effect good, low price, water ratio is lower.
The present invention is used for the inorganic composite conditioner of sludge dewatering, comprises flyash and unslaked lime, and wherein the weight percent of flyash is 17-75%, and surplus is a unslaked lime.Improve as optimizing, the weight percent of flyash is 37.5-64%.
The method of sludge dewatering may further comprise the steps:
(1) modified: take by weighing an amount of inorganic composite conditioner and add in the mud and stir, the weight percent that adds of inorganic composite conditioner is 6-20% of a mud.
(2) dehydration: will stir modified after mud mixed liquid pump into sludge dewatering equipment with sludge pump, carry out mechanical dehydration.
The present invention makes inorganic composite conditioner with the raw material unslaked lime of cheapness and flyash the excess sludge of second pond is nursed one's health.The wherein electrical neutralization of flyash and adsorption bridging effect can destroy the stability of mud colloidal solid, is beneficial to and disperses short grained gathering, improves dewatering; Unslaked lime not only can play and help the effect of coagulating, and can form alkaline environment, and killing microorganisms plays the de-odorised effect.Flyash satisfies first level flour coal ash requirement in " flyash concrete utilisation technology standard " (GBJ146-90), unslaked lime satisfies the requirement of People's Republic of China's building material industry standard silicate building products with unslaked lime (JC/T 621-1996) salable product, and the content of free calcium oxide of its unslaked lime is about 60%.
The present invention is an amendment with the inorganic material unslaked lime and the industrial residue flyash of cheapness, and particularly, the present invention has following characteristics:
(1) amendment that adds among the present invention all is cheap inorganic materials, substitutes conventional cpolyacrylamids flocculation agent, and the mud cake after the dehydration is easy to the starting material as the preparation building materials.
(2) among the present invention, moisture content of the cake can reduce to 45-60% after the sludge dewatering, and the mud resistivity reduces to 10
6-10
7S
2/ g.Because the reduction of resistivity, natural drying is after 2-3 days, and water ratio can drop to below 40%.
Description of drawings
Fig. 1 is the sludge dewatering schematic flow sheet.
Embodiment
Mud is taken from the excess sludge of sewage work's second pond, and water ratio is 98%; Flyash satisfies first level flour coal ash requirement in the flyash concrete utilisation technology standard (GBJ146-90); Unslaked lime satisfies the requirement of People's Republic of China's building material industry standard silicate building products with unslaked lime (JC/T 621-1996) salable product, and the content of free calcium oxide of its unslaked lime is about 60%.
As shown in Figure 1, the excess sludge that second pond is discharged is by valve 1, inorganic composite conditioner enters whipping appts 3 together by opening for feed 2 and stirs, the mud after stirring and the mixture of inorganic conditioner enter sludge dewatering equipment by valve 4 through sludge pump 5 and dewater, dehydration back mud cake directly carries out next step recycling, and the water that dehydration produces returns treatment tank 7 and handles.
The present invention is further detailed explanation below in conjunction with example.
Embodiment 1:
Inorganic composite conditioner feed composition and percent by weight are: flyash 17%, unslaked lime 83%.
Dewatering is: add 6% inorganic composite conditioner and stir and amendment and mud are mixed after sludge pump enters the plate-and-frame filter press dehydration in the second pond excess sludge, obtain water ratio and be 57.6% mud cake.Mud resistivity after the modulation is 1.33 * 10
7S
2/ g.
Embodiment 2:
Inorganic composite conditioner feed composition and percent by weight are: flyash 37.5%, unslaked lime 62.5%.
Dewatering is
In the second pond excess sludge, add 8% inorganic composite conditioner and stir and amendment and mud are mixed, obtain water ratio and be 52.4% mud cake after sludge pump enters the sludge dewatering equipment dehydration.Mud resistivity after the modulation is 1.3 * 10
7S
2/ g.
Embodiment 3:
Inorganic composite conditioner feed composition and percent by weight are: flyash 50%, unslaked lime 50%.
Dewatering is:
In the second pond excess sludge, add 10% inorganic composite conditioner and stir and amendment and mud are mixed, obtain water ratio and be 49.25% mud cake after sludge pump enters the plate-and-frame filter press dehydration.Mud resistivity after the modulation is 5.7 * 10
6S
2/ g.
Embodiment 4:
Inorganic composite conditioner feed composition and percent by weight are: flyash 64%, unslaked lime 36%.
Dewatering is:
In the second pond excess sludge, add 20% inorganic composite conditioner and stir and amendment and mud are mixed, obtain water ratio and be 47.2% mud cake after sludge pump enters the plate-and-frame filter press dehydration.Mud resistivity after the modulation is 9.4 * 10
6S
2/ g.
Embodiment 5:
Inorganic composite conditioner feed composition and percent by weight are: flyash 75%, unslaked lime 25%.
Dewatering is:
In the second pond excess sludge, add 20% inorganic composite conditioner and stir and amendment and mud are mixed, obtain water ratio and be 60.0% mud cake after sludge pump enters the plate-and-frame filter press dehydration.Mud resistivity after the modulation is 4.3 * 10
7S
2/ g.
The mud resistivity adopts conventional measuring method:
Adopt the vacuum tightness of 0.08MPa to carry out the sludge dewatering test.The record filtering time t and the amount of filtrate V in the corresponding moment and filtrate cumulative volume calculate the mud resistivity.
Claims (3)
1, a kind of inorganic composite conditioner is characterized in that, it comprises flyash and unslaked lime, and wherein the weight percent of flyash is 17-75%, and surplus is a unslaked lime, and the content of free calcium oxide of unslaked lime is 50-70%.
According to the inorganic composite conditioner of claim 1, it is characterized in that 2, the weight percent of flyash is 37.5-64%.
3, a kind of mud dewatering method that utilizes the described inorganic composite conditioner of claim 1 is characterized in that: its following steps:
(1) modified: will stir in the described inorganic composite conditioner adding mud, the inorganic composite conditioner of adding and the weight percent of mud are 6%-20%;
(2) dehydration: the mud mixed liquid that stirs after modified is carried out mechanical dehydration.
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|---|---|---|---|
| CNA2008100488255A CN101397181A (en) | 2008-08-15 | 2008-08-15 | Inorganic composite conditioner and sludge dewatering method thereof |
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|---|---|---|---|
| CNA2008100488255A CN101397181A (en) | 2008-08-15 | 2008-08-15 | Inorganic composite conditioner and sludge dewatering method thereof |
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Family
ID=40516051
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|---|---|---|---|
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Cited By (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786787A (en) * | 2010-03-24 | 2010-07-28 | 宇星科技发展(深圳)有限公司 | Sludge dewatering integrated process |
| CN102001811A (en) * | 2010-10-26 | 2011-04-06 | 中国恩菲工程技术有限公司 | Improved sludge mixing device |
| CN102153267A (en) * | 2011-04-15 | 2011-08-17 | 复旦大学 | Method for modifying and dewatering sludge |
| CN101633549B (en) * | 2009-08-31 | 2011-09-07 | 江汉大学 | Sludge conditioner and sludge dewatering method thereof |
| CN102206031A (en) * | 2011-04-26 | 2011-10-05 | 周悦先 | Cleaning agent for urban sewage sludge and sludge treatment method |
| CN102241470A (en) * | 2011-05-27 | 2011-11-16 | 赵向东 | Sludge treatment and disposal method and system by combining calcium-added heat drying and cement rotary kiln |
| CN102531329A (en) * | 2012-01-09 | 2012-07-04 | 苏州格瑞特环保科技产业发展有限公司 | Organic composite flocculant for conditioning and dehydration of sludge |
| CN102608292A (en) * | 2012-03-09 | 2012-07-25 | 北京建筑工程学院 | Sludge specific resistance measuring apparatus |
| CN102690041A (en) * | 2011-03-25 | 2012-09-26 | 刘志刚 | Method for sludge desiccation by natural limestone |
| CN101597532B (en) * | 2009-07-09 | 2013-02-13 | 余国贤 | Sludge fuel and preparation method thereof |
| CN103332837A (en) * | 2013-07-19 | 2013-10-02 | 江苏康泰环保设备有限公司 | Novel sludge modification equipment and method |
| CN103739186A (en) * | 2014-01-13 | 2014-04-23 | 佛山市金凯地过滤设备有限公司 | Method for modulating and modifying sludge |
| CN103848495A (en) * | 2012-11-30 | 2014-06-11 | 环境保护部华南环境科学研究所 | Application of copper-adsorbed fly ash ceramsite |
| CN104973751A (en) * | 2015-08-06 | 2015-10-14 | 台明青 | Additive used for sludge dehydration and sludge dehydration method |
| CN105217926A (en) * | 2015-10-20 | 2016-01-06 | 盐城琛丹低碳技术研究院有限公司 | Sludge reduction method |
| CN108341583A (en) * | 2017-01-22 | 2018-07-31 | 同方环境股份有限公司 | A kind of sludge dehydration conditioner and its dewatering |
| CN110255857A (en) * | 2019-05-28 | 2019-09-20 | 路德环境科技股份有限公司 | Low alkali conditioner and dewatering for construction slurry deep dehydration |
| CN110395878A (en) * | 2019-06-18 | 2019-11-01 | 路德环境科技股份有限公司 | A kind of municipal sludge deep dewatering, solidifying method |
| CN111453960A (en) * | 2019-01-18 | 2020-07-28 | 宝山钢铁股份有限公司 | Sludge conditioner for water treatment of steel plant and use method thereof |
-
2008
- 2008-08-15 CN CNA2008100488255A patent/CN101397181A/en active Pending
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101597532B (en) * | 2009-07-09 | 2013-02-13 | 余国贤 | Sludge fuel and preparation method thereof |
| CN101633549B (en) * | 2009-08-31 | 2011-09-07 | 江汉大学 | Sludge conditioner and sludge dewatering method thereof |
| CN101786787A (en) * | 2010-03-24 | 2010-07-28 | 宇星科技发展(深圳)有限公司 | Sludge dewatering integrated process |
| CN102001811B (en) * | 2010-10-26 | 2012-09-19 | 中国恩菲工程技术有限公司 | Improved sludge mixing device |
| CN102001811A (en) * | 2010-10-26 | 2011-04-06 | 中国恩菲工程技术有限公司 | Improved sludge mixing device |
| CN102690041A (en) * | 2011-03-25 | 2012-09-26 | 刘志刚 | Method for sludge desiccation by natural limestone |
| CN102690041B (en) * | 2011-03-25 | 2013-12-25 | 刘志刚 | Method for sludge desiccation by natural limestone |
| CN102153267A (en) * | 2011-04-15 | 2011-08-17 | 复旦大学 | Method for modifying and dewatering sludge |
| CN102206031A (en) * | 2011-04-26 | 2011-10-05 | 周悦先 | Cleaning agent for urban sewage sludge and sludge treatment method |
| CN102241470A (en) * | 2011-05-27 | 2011-11-16 | 赵向东 | Sludge treatment and disposal method and system by combining calcium-added heat drying and cement rotary kiln |
| CN102241470B (en) * | 2011-05-27 | 2012-10-03 | 赵向东 | Sludge treatment and disposal method and system by combining calcium-added heat drying and cement rotary kiln |
| CN102531329A (en) * | 2012-01-09 | 2012-07-04 | 苏州格瑞特环保科技产业发展有限公司 | Organic composite flocculant for conditioning and dehydration of sludge |
| CN102608292A (en) * | 2012-03-09 | 2012-07-25 | 北京建筑工程学院 | Sludge specific resistance measuring apparatus |
| CN102608292B (en) * | 2012-03-09 | 2014-07-23 | 北京建筑大学 | Sludge specific resistance measuring apparatus |
| CN103848495A (en) * | 2012-11-30 | 2014-06-11 | 环境保护部华南环境科学研究所 | Application of copper-adsorbed fly ash ceramsite |
| CN103332837A (en) * | 2013-07-19 | 2013-10-02 | 江苏康泰环保设备有限公司 | Novel sludge modification equipment and method |
| CN103739186A (en) * | 2014-01-13 | 2014-04-23 | 佛山市金凯地过滤设备有限公司 | Method for modulating and modifying sludge |
| CN103739186B (en) * | 2014-01-13 | 2016-06-22 | 佛山市金凯地过滤设备有限公司 | The method that the modulation of a kind of mud is modified |
| CN104973751A (en) * | 2015-08-06 | 2015-10-14 | 台明青 | Additive used for sludge dehydration and sludge dehydration method |
| CN105217926A (en) * | 2015-10-20 | 2016-01-06 | 盐城琛丹低碳技术研究院有限公司 | Sludge reduction method |
| CN108341583A (en) * | 2017-01-22 | 2018-07-31 | 同方环境股份有限公司 | A kind of sludge dehydration conditioner and its dewatering |
| CN111453960A (en) * | 2019-01-18 | 2020-07-28 | 宝山钢铁股份有限公司 | Sludge conditioner for water treatment of steel plant and use method thereof |
| CN110255857A (en) * | 2019-05-28 | 2019-09-20 | 路德环境科技股份有限公司 | Low alkali conditioner and dewatering for construction slurry deep dehydration |
| CN110255857B (en) * | 2019-05-28 | 2021-12-14 | 路德环境科技股份有限公司 | Low-alkali conditioner for deep dehydration of building slurry and dehydration method |
| CN110395878A (en) * | 2019-06-18 | 2019-11-01 | 路德环境科技股份有限公司 | A kind of municipal sludge deep dewatering, solidifying method |
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Application publication date: 20090401 |