CN102153267A - Method for modifying and dewatering sludge - Google Patents
Method for modifying and dewatering sludge Download PDFInfo
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- CN102153267A CN102153267A CN2011100945515A CN201110094551A CN102153267A CN 102153267 A CN102153267 A CN 102153267A CN 2011100945515 A CN2011100945515 A CN 2011100945515A CN 201110094551 A CN201110094551 A CN 201110094551A CN 102153267 A CN102153267 A CN 102153267A
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Abstract
The invention belongs to the technical field of environmental protection, and particularly relates to a method for modifying and dewatering sludge. The method provided by the invention comprises the following steps: adding water to sludge which is subjected to primary dewatering by a sewage treatment plant, thereby enhancing the flowability of the sludge; adding fine particles with high water permeability into the sludge, and evenly stirring; adding a polymeric flocculant into the mixture, so that the fine particles are coated by the sludge to form a complicated structure; and finally, pumping the mixture into a plate-and-frame filter press to carry out pressure filtration, thereby obtaining a secondary dewatered filter cake of which the water content is lower than 60%. The invention has the advantages of stable technique, simple process, low price of additive materials, low operating cost, and short pressure filtration time; heavy metals in the sludge precipitate in the sludge due to the coprecipitation action; and the effluent water of pressure filtration is clear.
Description
Technical field
The invention belongs to environmental technology field, be specifically related to a kind of method of sludge dewatering, particularly adopt medicament that mud is carried out modified back dehydration method.
Background technology
Along with the popularizing of sewage treatment facility, the raising of processing rate and the in-depth of degree of treatment, the mud generation of Sewage Plant has bigger growth, by in by the end of September, 2010,2630 urban wastewater treatment firms have been built up in the whole nation, day sewage treatment capacity reaches 1.22 billion cubic meters, to produce a large amount of active sludge thus, the secondary pollution problem that causes can not be ignored.Mud is the solid precipitation material that is produced by water and sewage treatment process, and pre-treatment, preliminary sedimentation tank, second pond that generally derives from water treatment etc. located.The construction of sewage work in the past often only notices that sewage disposal will reach emission standard, generally only carries in the design dewatered sludge outward transport and comprehensive utilization, does not calculate its investment and often handles cost of business operation.Without the mud of stabilizing treatment, very easily corrupt and produce stench because of the organic content height, especially contain a large amount of germs, parasitic ovum and virus, easily cause the secondary pollutions such as propagation of transmissible disease.Therefore how reasonably handle, disposing sludge, become the problem that municipal wastewater treatment plant and relevant departments must draw attention.
According to analysis, mud is very tight with combining of water molecules, and has different phases: free-water, capillary water, internal water and attached water.Sludge dewatering with subtract why difficult hold decrement, be because resulting mud has high-hydrophilic in sewage treatment process, make moisture in the mud be difficult to low-cost high-efficiency and separate.At present, the treatment process of mud comprises that mainly the concentrating of mud, digestion, dehydration, mummification and methods such as burning, system fertilizer and landfill handle.Domestic sewage work adopts the method for mechanical dehydration moisture percentage in sewage sludge can only be reduced to about 80% usually, and a large amount of water is that the subsequent disposal of mud is brought numerous difficulties.Thereby the matter of utmost importance of sludge disposal is sludge reduction, removes the most of moisture that contains in the mud, and for subsequent disposal, utilization and transportation create conditions, the hazardous and noxious substances of the environment of decontamination simultaneously reclaims the energy and resource as far as possible.
National house in 2009 and town and country construction portion, Environmental Protection Department, the Ministry of Science and Technology unite and have issued " the urban wastewater treatment firm sludge treatment is disposed and pollution prevention technique policy (trying) " new policy; stable and farmland utilization has clear and definite requirement to the mud of municipal wastewater treatment plant, requires the water ratio of mud to be reduced to below 60% and just can advance the landfill yard landfill.Since usually municipal sludge at water ratio behind the mechanical dehydration generally more than 80%, major cause can't all be extruded by the pressure of traditional mechanical dehydration owing to biological cells in sludge and colloid contain a large amount of " interstitial waters " (accounting for total moisture 70%), be the mucilage shape when moisture percentage in sewage sludge is between 60%～65% simultaneously, water molecules is wrapped up by one deck colloid, this zone is referred to as mud " viscose glue phase region ", be the most difficult stage of sludge dewatering, further remove by the method for traditional mechanical dehydration is very difficult.Therefore be necessary to research and develop new technology with further deep dehydration decrement.
The dewatering of mud is relevant, also relevant with the dewatering machine kind with sludge quality, Opsonizing method and condition etc., wherein to the understanding of sludge quality with the selection of the method for sludge conditioning is directly connected to the degree of sludge dewatering.Carry out strength reason before sludge dewatering, change the physico-chemical property of mud particle, destroy its colloidal structure, reduce the avidity of itself and water, thereby improve dewatering, this process is called the conditioning of mud or modified.Deeply dehydrating sludge is exactly that the mud behind the traditional sludge mechanical dehydration (about 80% water ratio) further is dewatered to below 60% water ratio.At present, domestic have sludge treatment to the main method that water ratio is lower than below 60%: add heat drying, add medicament curing, adopt means such as special pressure filter, supersonic wave wall breaking.Number of patent application provides a kind of method of deeply dehydrating sludge for the patent of ZL200610123552.7, the chemical agent that this method adopts iron and calcium ion to mud carry out modified after, adopt the pressure filter of 1.5Mpa ~ 2.5Mpa that the mud after modified is dewatered, this method is better at some specific mud effects, but there is logical suitable property problem, for fine particle mud such as anaerobically fermentings, exist dosage big, defect of high cost.Domestic number of patent application is that 200810198538.2 patent adopts tensio-active agent dodecyl benzyl dimethyl ammonium chloride (1227) to sludge treatment, can effectively reduce the resistivity of mud, but this tensio-active agent price is comparatively expensive, and processing cost is higher.Domestic number of patent application 96103773.3 adopts DC electric field that mud is handled, but the water ratio of the mud after this method processing is still higher.Domestic number of patent application be 200810048825.5 and number of patent application be that 200710150706.6 patent adopts inorganic composite conditioner that mud is handled, treatment effect is better, but has the higher and calorific value that cause handling back mud of the addition more problem that descends.Number of patent application is 200810198539.7 to have adopted combined type sludge conditioning mode, in mud, added tensio-active agent 1227 respectively, flocculation agent and auxiliary agent (substratum after edible mushroom is plucked) have reached the effect of deeply dehydrating sludge, but have still had the processing costs problem of higher.
To sum up state, article of publishing at present and patent mainly adopt flocculation agent and some tensio-active agents to mud carry out modified after dehydration again, its primary process is at aluminium salt, make the sludge bacteria micelle assemble under the effect of chemical flocs such as molysite, the crumb structure of Zeng Daing finally precipitates in water gradually, by further interpolation polymeric flocculant, the employing physical method concentrates, can slough major part or a part of so-called free state water, adopt the method for this modifier treatment, the water ratio of general mud can be low to moderate below 60%, but need to consume a large amount of chemical agents, working cost is higher.
Summary of the invention
The object of the present invention is to provide the method for a kind of economical and efficient, sludge dewatering easy to use.
At present, the modified of mud is with flocculation agent mud self charge neutrality to be produced cohesion, leans on the modified mud of the bonding force formation of flocculation agent to have the big short texture in gap, and conventional at present mechanical dehydration is difficult to reach water ratio below 60%.If the dewatered cake that water ratio is high is broken into grain of rice size, be clipped in the filter paper, second dehydration is carried out in squeezing again, can reach water content and be lower than 60% requirement.Based on this discovery, the present invention proposes mud precoat filtration dehydration method, and its step is,
(1) for through the mud (its water ratio is about about 80%) after sewage work's primary dewatering, adds entry, its water ratio is reached more than 90%, to improve the flowability of mud;
(2) add the high minuteness particle of water-permeable therein, mix;
(3) in mixture, add polymeric flocculant, make to form composite construct by minuteness particle and mud parcel;
(4) this composite construct is pumped into press filtration in the plate-and-frame filter press, general time of filter pressing is 45min～120min, can obtain water ratio and be lower than 60% second dehydration filter cake.
Above-mentioned mud, if without a press filtration of sewage work, in sewage work, can directly pass through concentration, its water ratio is about 95%, evenly mix after can directly adding the high minuteness particle of interpolation water-permeable therein, after fully stirring, adding polymeric flocculant in mixture makes minuteness particle and mud be wrapped to form composite construct, this mixture is pumped into press filtration in the plate-and-frame filter press, general time of filter pressing is 45min～120min, can obtain water ratio and be lower than 60% second dehydration filter cake.
Among the present invention, the high minuteness particle of water-permeable that adds is aluminium hydroxide, ironic hydroxide, silicon-dioxide, aluminum oxide, Indian red, calcium sulfate, Calucium Silicate powder, Magnesium Silicate q-agent, pure aluminium silicate, ferric metasilicate, flyash, coal dust etc., characteristic difference according to mud, can be one or more combinations of above-mentioned substance, consumption is 10% ~ 70% of a sewage sludge solid weight.
Among the present invention, the polymeric flocculant that adds is a polymer amides flocculation agent (as polyacrylamide), polyquaternary amine salt flocculation agent (as the polydimethyl dipropenyl ammonium chloride) or its mixture (perhaps multipolymer, as polydimethyl dipropenyl ammonium chloride-acrylamide copolymer), the consumption of flocculation agent is 50 ~ 800ppm.
Through the pressure filtration yielding water clarification after this method processing, organism wherein is trapped within the mud substantially through the flocculation agent flocculation.Heavy metal in the mud mainly is trapped within the mud because of the copolymerization precipitation, thereby sewage can reach corresponding emission standard through after the suitable biochemical treatment.
The invention has the advantages that:
1) process stabilizing, flow process is simple;
2) the additive cost of material is stablized cheaply, and working cost is low;
3) time of filter pressing is short, and the general press filtration operating mode time is in 2 hours;
4) heavy metal in the mud is deposited in the mud because of co-precipitation, the pressure filtration yielding water clarification.
Embodiment
Embodiment 1Certain municipal wastewater treatment plant mud, after sewage work's belt machine dosing dehydration, its water ratio is about 80%.Getting one ton in its sample places in the steel basin, add 1 ton of sewage treatment plant tail water, 10min stirs, make its water ratio to 90%, utilize acid, alkali is regulated between its pH value to 6.0 ~ 8.0, evenly mix after adding the high minuteness particle of water-permeable therein, the minuteness particle that adds is an ironic hydroxide, silicon-dioxide and calcium aluminate, weight is 60kg, ironic hydroxide in the minuteness particle that adds, the molar ratio of silicon-dioxide and calcium aluminate is 1:1:1, after evenly mixing, add the flocculation agent polyacrylamide, concentration is 300ppm, after stirring, this mixture is pumped into press filtration in the van-type plate-and-frame filter press, and time of filter pressing is 45min, promptly obtains water ratio and be 56% second dehydration filter cake.
Embodiment 2
Certain municipal wastewater treatment plant mud, after sewage work's whizzer dosing dehydration, its water ratio is about 78%.Getting one ton in its sample places in the steel basin, add sewage treatment plant tail water and evenly stir 10min, make its water ratio to 90%, utilize acid, alkali is regulated between its pH value to 6.0 ~ 8.0, evenly mix after adding the high minuteness particle of water-permeable therein, the minuteness particle that adds is an aluminium hydroxide, ironic hydroxide, silicon-dioxide, aluminium sesquioxide and calcium sulfate, weight is 110kg, aluminium hydroxide in the minuteness particle that adds, ironic hydroxide, silicon-dioxide, the molar ratio of aluminium sesquioxide and calcium sulfate is 1:1:2:1:2, after evenly mixing, add flocculation agent polydimethyl dipropenyl ammonium chloride-acrylamide copolymer, concentration is 400ppm, after stirring, this mixture is pumped into press filtration in the van-type plate-and-frame filter press, time of filter pressing is 90min, promptly obtains water ratio and be 52% second dehydration filter cake.
Claims (1)
1. modified dehydration method of mud is characterized in that concrete steps are:
(1) for adding entry, its water ratio is reached more than 90%, to improve the flowability of mud through the mud after sewage work's primary dewatering;
(2) in above-mentioned mud, add the high minuteness particle of water-permeable, mix, obtain mud mixture;
(3) in above-mentioned mud mixture, add polymeric flocculant, make to form composite construct by minuteness particle and mud parcel;
(4) above-mentioned composite construct is pumped in the plate-and-frame filter press, press filtration, time of filter pressing is 45min～120min, promptly obtains water ratio and is lower than 60% second dehydration filter cake;
Wherein, described minuteness particle is aluminium hydroxide, ironic hydroxide, silicon-dioxide, aluminum oxide, Indian red, calcium sulfate, Calucium Silicate powder, Magnesium Silicate q-agent, pure aluminium silicate, ferric metasilicate, flyash or coal dust, use one or more combinations of above-mentioned substance, consumption is 10% ~ 70% of a sewage sludge solid weight;
Described polymeric flocculant is a polymer amides flocculation agent, polyquaternary amine salt flocculation agent, and perhaps its mixture or multipolymer, the consumption of flocculation agent is 50 ~ 800ppm.
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Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102424512A (en) * | 2011-10-25 | 2012-04-25 | 苏州工业园区格瑞特泥科学与应用技术研究院有限公司 | Sludge deep dehydration method comprising wall breaking-penetrating-press filtrating process |
| CN103030259A (en) * | 2013-01-07 | 2013-04-10 | 北京科技大学 | Method for conditioning and dehydrating residual sludge |
| CN103159274A (en) * | 2011-12-09 | 2013-06-19 | 财团法人工业技术研究院 | Method for treating high-salinity concentrated waste liquid |
| CN103288327A (en) * | 2013-06-06 | 2013-09-11 | 江苏富大环境科技有限公司 | Sludge treatment method |
| CN105110587A (en) * | 2015-09-29 | 2015-12-02 | 天津壹新环保工程有限公司 | Sludge pretreatment technology with desalting effect |
| CN105645732A (en) * | 2016-02-19 | 2016-06-08 | 蚌埠圻润环境工程科技有限公司 | Combined chemical conditioning method for deep drying of dehydrated sludge |
| CN105645587A (en) * | 2016-02-24 | 2016-06-08 | 杭州富阳高博信息技术服务有限公司 | Biological agent for treatment of industrial polluted water |
| CN105731653A (en) * | 2016-02-22 | 2016-07-06 | 杭州富阳高博信息技术服务有限公司 | Preparation for treating aniline waste water and treatment method |
| CN106630542A (en) * | 2016-11-29 | 2017-05-10 | 西安理工大学 | Flocculant for treating slurry, preparation method and slurry treatment method |
| CN108793675A (en) * | 2017-05-02 | 2018-11-13 | 蔡万祥 | The composition quenched for sludge and method |
| CN110002708A (en) * | 2019-04-18 | 2019-07-12 | 苏州草宝能源科技有限公司 | A kind of pyrolyzing sludge dehydration and drying processing burning disposing technique |
| CN110002707A (en) * | 2019-04-18 | 2019-07-12 | 苏州草宝能源科技有限公司 | A kind of multistage technique for being heat-treated dry sludge |
| CN111072256A (en) * | 2018-10-19 | 2020-04-28 | 上海申英环保科技有限公司 | Sludge dewatering method for plate and frame machine |
| CN111333282A (en) * | 2020-02-09 | 2020-06-26 | 中日友好环境保护中心(生态环境部环境发展中心) | Rural black and odorous water body sediment treatment system and method |
| CN112110629A (en) * | 2020-09-04 | 2020-12-22 | 吴植仁 | Sludge filter pressing method using sludge carbon as filter aid |
| CN112574794A (en) * | 2020-11-17 | 2021-03-30 | 珠海红塔仁恒包装股份有限公司 | Treatment method of papermaking sludge |
| CN112897820A (en) * | 2021-03-30 | 2021-06-04 | 三亚易可霖环保科技有限公司 | Equipment and method for treating sewage by talcum powder high-concentration activated sludge process |
| WO2021195912A1 (en) * | 2020-03-31 | 2021-10-07 | 安徽舜禹水务股份有限公司 | Decentralized rapid treatment device for excess sludge |
| CN113860635A (en) * | 2021-09-16 | 2021-12-31 | 江门市安诺特炊具制造有限公司 | Method for treating sewage of aluminum alloy cooker |
| CN114249520A (en) * | 2020-09-22 | 2022-03-29 | 湘潭市污水处理有限责任公司 | Advanced dehydration treatment agent and treatment method for manganese-containing sludge |
| CN114873901A (en) * | 2022-05-07 | 2022-08-09 | 广州诺冠环保科技有限公司 | Preparation method of novel sludge conditioner applied to plate-and-frame filter press |
| CN115504640A (en) * | 2022-11-14 | 2022-12-23 | 北京大臻科技有限公司 | Sludge treatment method for adsorbing heavy metals |
| CN117023944A (en) * | 2023-10-08 | 2023-11-10 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
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| CN102424512A (en) * | 2011-10-25 | 2012-04-25 | 苏州工业园区格瑞特泥科学与应用技术研究院有限公司 | Sludge deep dehydration method comprising wall breaking-penetrating-press filtrating process |
| CN103159274A (en) * | 2011-12-09 | 2013-06-19 | 财团法人工业技术研究院 | Method for treating high-salinity concentrated waste liquid |
| CN103159274B (en) * | 2011-12-09 | 2015-04-01 | 财团法人工业技术研究院 | Method for treating high-salinity concentrated waste liquid |
| CN103030259A (en) * | 2013-01-07 | 2013-04-10 | 北京科技大学 | Method for conditioning and dehydrating residual sludge |
| CN103030259B (en) * | 2013-01-07 | 2014-03-26 | 北京科技大学 | Method for conditioning and dehydrating residual sludge |
| CN103288327A (en) * | 2013-06-06 | 2013-09-11 | 江苏富大环境科技有限公司 | Sludge treatment method |
| CN105110587A (en) * | 2015-09-29 | 2015-12-02 | 天津壹新环保工程有限公司 | Sludge pretreatment technology with desalting effect |
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| CN105645587B (en) * | 2016-02-24 | 2018-04-24 | 武汉汇曼联合科技有限公司 | The biological agent of industrial pollution water body processing |
| CN106630542A (en) * | 2016-11-29 | 2017-05-10 | 西安理工大学 | Flocculant for treating slurry, preparation method and slurry treatment method |
| CN108793675A (en) * | 2017-05-02 | 2018-11-13 | 蔡万祥 | The composition quenched for sludge and method |
| CN111072256A (en) * | 2018-10-19 | 2020-04-28 | 上海申英环保科技有限公司 | Sludge dewatering method for plate and frame machine |
| CN110002708A (en) * | 2019-04-18 | 2019-07-12 | 苏州草宝能源科技有限公司 | A kind of pyrolyzing sludge dehydration and drying processing burning disposing technique |
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| CN111333282A (en) * | 2020-02-09 | 2020-06-26 | 中日友好环境保护中心(生态环境部环境发展中心) | Rural black and odorous water body sediment treatment system and method |
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| WO2021195912A1 (en) * | 2020-03-31 | 2021-10-07 | 安徽舜禹水务股份有限公司 | Decentralized rapid treatment device for excess sludge |
| CN112110629A (en) * | 2020-09-04 | 2020-12-22 | 吴植仁 | Sludge filter pressing method using sludge carbon as filter aid |
| CN114249520A (en) * | 2020-09-22 | 2022-03-29 | 湘潭市污水处理有限责任公司 | Advanced dehydration treatment agent and treatment method for manganese-containing sludge |
| CN112574794A (en) * | 2020-11-17 | 2021-03-30 | 珠海红塔仁恒包装股份有限公司 | Treatment method of papermaking sludge |
| CN112897820A (en) * | 2021-03-30 | 2021-06-04 | 三亚易可霖环保科技有限公司 | Equipment and method for treating sewage by talcum powder high-concentration activated sludge process |
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| CN114873901A (en) * | 2022-05-07 | 2022-08-09 | 广州诺冠环保科技有限公司 | Preparation method of novel sludge conditioner applied to plate-and-frame filter press |
| CN115504640A (en) * | 2022-11-14 | 2022-12-23 | 北京大臻科技有限公司 | Sludge treatment method for adsorbing heavy metals |
| CN117023944A (en) * | 2023-10-08 | 2023-11-10 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
| CN117023944B (en) * | 2023-10-08 | 2024-01-23 | 杭州尚善若水环保科技有限公司 | Sludge mixing dehydration method in LCD manufacturing industry |
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Application publication date: 20110817 |