CN104150741A - Sludge chemical conditioning method and conditioner - Google Patents
Sludge chemical conditioning method and conditioner Download PDFInfo
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- CN104150741A CN104150741A CN201410413671.0A CN201410413671A CN104150741A CN 104150741 A CN104150741 A CN 104150741A CN 201410413671 A CN201410413671 A CN 201410413671A CN 104150741 A CN104150741 A CN 104150741A
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Abstract
The invention discloses a sludge chemical conditioning method and a conditioner. The method comprises the following steps: step A, adding an iron trichloride (FeCl3) water solution into a sludge conditioning tank under stirring, wherein the stirring speed is 18-22 R/min; step B, after 8 to 12 minutes, adding cationic polyacrylamide into the tank under stirring, wherein the stirring speed is 5-10 R/min. The conditioner comprises an inorganic conditioner which is added at first and an organic conditioner which is added after the inorganic conditioner. The inorganic conditioner is an iron trichloride water solution with a mass concentration of 36-40%, and the organic conditioner is a liquid cationic polyacrylamide water solution with a concentration of 0.42 to 0.61%. The invention provides a sludge chemical conditioning method, which can effectively improve the sludge dehydrating performance and solve the problems of bad water permeability and strong sticking performance of sludge, and further provides a conditioner.
Description
Technical field
The present invention relates to method for sludge treatment, relate in particular to the Sludge Chemical Conditioning method and the amendment that change mud physico-chemical property.
Background technology
In recent years, along with the develop rapidly of national economy and the progressively raising of living standards of the people, the degree for the treatment of of city domestic sewage and industrial sewage improves rapidly, when sewage is purified, pollution substance in sewage is separated as mud, that is to say that mud be that sewage work purifies waste water is the by product producing, is a kind of extremely heterogeneous body of complexity being comprised of organic substance, bacterium thalline, inorganic particle, colloid etc.In the past, the phenomenon of sewage treatment industry ubiquity " the light mud of heavy water " has been ignored sludge treatment and disposal always, tends to direct discharge, to environment, brings serious secondary pollution.By the end of 2010, the municipal sewage plant of China reached more than 2000, by wastewater treatment rate 70%, calculated, and will dispose of sewage 1.25 hundred million tons every day, approximately produced 1,250,000 tons, the mud of water ratio 98%.The sludge disposal technology that turns to object with innoxious, minimizing, resource more and more comes into one's own.
The kind of mud is complicated, by sources divides to mainly contain sanitary sewage mud, industrial wastewater sludge and to sewage sludge three classes.Sanitary sewage mud is typical organic sludge, contain the materials such as organic substance, inorganic substance, bacterium and microorganism, compare industrial wastewater sludge more difficult, therefore first the research and development of sludge conditioning deep dehydration integrated system are set about from sanitary sewage sludge problem, as long as solve sanitary sewage sludge treatment problem, industrial wastewater sludge is processed problem and has also just been readily solved.Sludge treatment the most important thing is to reduce moisture percentage in sewage sludge, i.e. minimizing.
Mud contained humidity approximate composition is: intergranular interstitial water accounts for 70%, and the water between particle in kapillary accounts for 20%, and mud granule planar water and granule interior water account for 10%.Therefore, the primary goal of intergranular interstitial water sludge treatment, the most most economical method of removing the intergranular space water of proportion maximum is mechanical sludge dewatering method.
In order to improve the dewatering of mud, solve the problems such as mud bad hydraulic permeability, easy sticky cloth, before dehydration, need to adopt special conditioning technology to change the physico-chemical property of mud, make mud more easily reach the object of mud-water separation.At present, sludge conditioning technology mainly contains and eluriates conditioning, temperature difference conditioning, chemical conditioning and biofloculation conditioning, ultrasonic wave conditioning etc.Wherein, eluriating conditioning technology needs a large amount of water to carry out, and effect is poor; Temperature difference conditioning technology need to consume the more energy and maintain; Biofloculation is nursed one's health, ultrasonic wave conditioning technology is still immature.Adding chemical amendment, to improve dewatering performance of sludge be preferred.
But, the organic amendment of Sludge Chemical Conditioning agent and inorganic conditioner in prior art.Organic amendment is conventional polyacrylamide (PAM), and the mud flco that organic amendment forms is larger, and mud-water separation efficiency is high, but closely knit not, easily sticks on filter cloth, and have " sugared heart phenomenon " during mechanical dehydration.Inorganic conditioner is conventional aluminium salt and the large class of molysite two, and its hydrophobicity is good, can produce aggregate filtering layer, the sludge filter cake forming does not adhere to filter cloth, and without " sugared heart phenomenon ", but inorganic conditioner flocculating effect is not as organic amendment, the flco forming is less, and mud-water separation efficiency is low.Therefore, urgently develop a kind of dewatering that can better improve mud, solve novel Sludge Chemical Conditioning agent and the Opsonizing method of the problems such as mud bad hydraulic permeability, easy sticky cloth.
Summary of the invention
The present invention is directed to deficiency of the prior art, a kind of dewatering that can effectively improve mud is provided, and effectively solve chemical conditioning method and the amendment of the mud of mud bad hydraulic permeability, easy sticky cloth problem.
In order to solve the problems of the technologies described above, the present invention is solved by following technical proposals:
The chemical conditioning method of mud, comprises following steps successively:
Steps A: add ferric chloride aqueous solutions (FeCl in sludge conditioning pond
3), stirring simultaneously, stirring velocity is 18-22R/min;
After step B:8-12 minute, add cationic polyacrylamide, stir simultaneously, stirring velocity is 5-10R/min.
For city domestic sewage treatment plant, produce the character of mud, the present invention selects organic amendment of trace to coordinate a small amount of inorganic conditioner, in conjunction with forming combined cooker technology, mud is nursed one's health.
Mud colloidal particle surface, generally all with negative electricity, exists electrostatic repulsion and hydration shell repulsion between particle.In addition, between colloidal particle, also have van der Waals interaction, mud granule is attracted each other.Do not adding before amendment, electrostatic repulsion and hydration shell repulsion are occupied an leading position, thereby mud colloidal dispersion system is steady in a long-term.According to quiet principle of electroneutrality, be used for the selection of polymeric flocculants of sludge conditioning with positively charged ion, adding the negative charge that can neutralize a part of Sludge Surface inexcessive in the situation that, reduce interparticle electrostatic repulsion and hydration shell repulsion, at this moment Van der Waals force just plays a leading role, and generation coagulative precipitation makes to collide with each other after mud elimination of colloid stability.
Fe in iron trichloride
3+hydrolysis ability is strong, and in the situation that pH is greater than 1, ferric iron just can generate the weak ion of monokaryon hydroxyl.It can generate two kinds of monokaryon groups [Fe(OH)]
2+, [Fe(OH)
2]
+, [Fe
3(OH)
4]
4+.These ions and the neutralizing effect of mud generation static form flco.The flco that iron trichloride forms is less, and as at this moment mud sent into mechanical dehydration device as Chamber Type Diaphragm Filter Press, filter cloth is difficult to hold back completely mud, and filtrate is muddy, and treatment effect is not good.The flco proportion that adopts molysite to form is larger, so settling property is good, for mud-water separation creates good conditions.
Cationic polyacrylamide is organic high polymer coagulant, and molecular weight is between 600-800 ten thousand, and molecular structure is chain or netted, has very strong wetting ability, ion surface is had again to very strong bounding force simultaneously.Water-soluble after adding, the active group on linearity or network molecule chain and the hydrogen bonded of colloid surface, the activity that a plurality of colloid ions is arbitrarily strapped in to polymer molecule in bridge formation mode connects above, thereby forms the thick floc particle of bridging shape or net connection shape.Although the electrostatic repulsion between colloid still can hinder mud granule flocculation, polymer molecule chain length surpasses the effective repulsion distance between micelle, will produce adsorption bridging effect and condenses.Cationic polyacrylamide with the neutralizing effect of mud granule generation static in can produce adsorption bridging effect, form larger flco, further improve sludge dewatering effect.
Liquor ferri trichloridi adds in conjunction with cationic-type polyacrylamide, first adds liquor ferri trichloridi, can send out and condense and precipitate with mud granule, forms less flco, and the flco proportion that molysite forms is larger, and settling property is good, for mud-water separation creates good conditions.Then add cationic-type polyacrylamide, static neutralizing effect occurs and produce adsorption bridging effect simultaneously, form larger chain or netted flco, further improve sludge dewatering effect.The reaction times as contrary in order of adding, cationic-type polyacrylamide need to be relatively long, and flco is loose, and stirring velocity can not be too fast, if add liquor ferri trichloridi again and stir, easily smashes established mud flco, affects sludge treatment effect.The different flco forming mainly due to mud and ferric chloride reaction of stirring velocity when two kinds of materials add is consolidation relatively, is difficult for destroyedly, and mud is larger and loose with the flco that cationic polyacrylamide forms, and stirring velocity is too fast will cause flco destruction.First adding and adding cationic polyacrylamide after iron trichloride is that the flco that polyacrylamide forms is easily rubbed, and can not stir for a long time because the mud flco that iron trichloride forms should not be rubbed.Churning time 8-12min is because iron trichloride can mix with mud completely within the scope of this, and the time is too short mixes inhomogeneously, long unnecessary, wastes stirring energy consumption.
As preferably, in steps A, stirring velocity is 20R/min.
As preferably, described cationic polyacrylamide is cationic liquid polyacrylamide.
Cationic liquid type polyacrylamide is compared powdery cationic-type polyacrylamide, more easily dilution, and saved greatly adding of agent equipment cost.
As preferably, described cationic liquid polyacrylamide, surface parcel one deck organic solvent during storage; Add before use, make organic solvent dissolution in water cationic liquid polyacrylamide mother liquor thin up, discharge cationic-type polyacrylamide molecule.
Because the molecular structure of cationic liquid type polyacrylamide is unstable, very easily decompose, deposit for some time after flocculating property greatly reduce.The present invention, at cationic liquid polyacrylamide surface parcel one deck organic solvent, forms the structure of " water-in-oil ", has greatly increased the stability of its molecular structure, and long-term storage can obviously not reduce flocculating property yet.During use, thin up makes organic solvent dissolution in water, discharges cationic-type polyacrylamide molecule, so also can not reduce its flocculating property.
As preferably, the dosage of cationic polyacrylamide mother liquor is the dewatered sludge 0.3%-0.5% of water ratio 0% per ton; After the dilution of cationic liquid polyacrylamide mother liquor, concentration is 4.2-6.1 ‰.
As preferably, after the dilution of cationic liquid polyacrylamide mother liquor, while adding, the concentration of cationic polyacrylamide solution is 5 ‰.
As preferably, described organic solvent is emulsifying agent, the soap class that described emulsifying agent is carboxylic acid or soap salt or the organic acid acetic of divalent metal salt or sulfonic acid.
As preferably, the mass concentration of ferric chloride aqueous solutions is 36-40%, and dosage is the dewatered sludge 8%-12% of water ratio 0% per ton.
As preferably, the mass concentration of ferric chloride aqueous solutions is 38%.
The chemical amendment of mud, comprise the inorganic conditioner of first interpolation and organic amendment of rear interpolation, described inorganic conditioner is that mass concentration is the ferric chloride aqueous solutions of 36-40%, and described organic amendment is that concentration is the cationic liquid polyacrylamide solution of 4.2-6.1 ‰.
According to technical scheme of the present invention, can effectively improve the dewatering of mud, and effectively solve mud bad hydraulic permeability, easy sticky cloth problem.
Embodiment
Below the present invention is described in further detail.
Embodiment
The chemical conditioning method of mud, comprises following steps successively:
Steps A: add ferric chloride aqueous solutions (FeCl in sludge conditioning pond
3), the mass concentration of ferric chloride aqueous solutions and dosage, as shown in following table one, stir after adding, and stirring velocity is as shown in following table one;
After step B:8-12 minute, add the diluent of cationic liquid polyacrylamide mother liquor, the concentration of diluent and dosage, as shown in following table one, stir after adding, and stirring velocity is as shown in following table one.
Described cationic liquid polyacrylamide mother liquor is the cationic liquid polyacrylamide that is coated with one deck organic solvent, add before use, make organic solvent dissolution in water cationic liquid polyacrylamide mother liquor thin up, discharge cationic-type polyacrylamide molecule.
In sludge conditioning pond, be provided with the whipping appts with variable-frequency motor, stirring velocity is adjustable.
Table one
The physical significance of sludge index SVI is: aeration tank outlet mixed solution through 30min quiet heavy after, every gram of volume (mL) that the formed precipitating sludge of dewatered sludge is shared.Sludge index SVI is the parameter of weighing sludge settling property, and this parametric representation sludge settling speed can reflect dewatering performance of sludge quality, the easier separating and dehydrating of lower mud.Conventional sludge settling property index is 50-150 mL/g, adopts the rear sludge settling property of present method conditioning significantly to reduce, and dewatering improves greatly.
Mud viscosity be mud while flowing with the perpendicular direction of flow direction on produce the suffered shearing stress of unit speed gradient.Lower being more not easy of sewage sludge viscosity glued filter cloth, and conventional sewage sludge viscosity numerical value is 90-120 mpas, and the treated viscosity of mud after the conditioning of employing the method is at 58-70 mpas, and viscosity reduces greatly.
As can be seen here, the present invention effectively improves the dewatering of mud, and effectively solves mud bad hydraulic permeability, easy sticky cloth problem.
In a word, the foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the present patent application the scope of the claims change and modify, and all should belong to the covering scope of patent of the present invention.
Claims (9)
1. the chemical conditioning method of mud, is characterized in that: comprise following steps successively:
Steps A: add ferric chloride aqueous solutions (FeCl in sludge conditioning pond
3), stirring simultaneously, stirring velocity is 18-22R/min;
After step B:8-12 minute, add cationic polyacrylamide, stir simultaneously, stirring velocity is 5-10R/min.
2. the chemical conditioning method of mud according to claim 1, is characterized in that: in steps A, stirring velocity is 20R/min.
3. the chemical conditioning method of mud according to claim 1, is characterized in that: described cationic polyacrylamide is cationic liquid polyacrylamide.
4. the chemical conditioning method of mud according to claim 3, is characterized in that: described cationic liquid polyacrylamide, surface parcel one deck organic solvent during storage; Add before use, make organic solvent dissolution in water cationic liquid polyacrylamide mother liquor thin up, discharge cationic-type polyacrylamide molecule.
5. the chemical conditioning method of mud according to claim 4, is characterized in that: the dosage of cationic polyacrylamide mother liquor is the dewatered sludge 0.3%-0.5% of water ratio 0% per ton; After the dilution of cationic liquid polyacrylamide mother liquor, concentration is 4.2-6.1 ‰.
6. the chemical conditioning method of mud according to claim 5, is characterized in that: concentration when cationic polyacrylamide solution adds is 5 ‰.
7. the chemical conditioning method of mud according to claim 1, is characterized in that: the mass concentration of ferric chloride aqueous solutions is 36-40%, and dosage is the dewatered sludge 8%-12% of water ratio 0% per ton.
8. the chemical conditioning method of mud according to claim 7, is characterized in that: the mass concentration of ferric chloride aqueous solutions is 38%.
9. the chemical amendment of mud, it is characterized in that: comprise the inorganic conditioner of first interpolation and organic amendment of rear interpolation, described inorganic conditioner is that mass concentration is the ferric chloride aqueous solutions of 36-40%, and described organic amendment is that concentration is the cationic liquid polyacrylamide solution of 4.2-6.1 ‰.
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|---|---|---|---|
| CN201410413671.0A CN104150741A (en) | 2014-06-28 | 2014-08-21 | Sludge chemical conditioning method and conditioner |
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|---|---|---|---|
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| CN201410297258 | 2014-06-28 | ||
| CN201410413671.0A CN104150741A (en) | 2014-06-28 | 2014-08-21 | Sludge chemical conditioning method and conditioner |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105923951A (en) * | 2016-06-21 | 2016-09-07 | 四川新开元环保工程有限公司 | Activated sludge stabilizing treatment method for sewage treatment |
| CN109179927A (en) * | 2018-09-20 | 2019-01-11 | 重庆三峡学院 | A kind of method of the circulating processing of excess sludge |
| CN109592880A (en) * | 2018-11-28 | 2019-04-09 | 湖州智清环保科技有限公司 | Landfill leachate generates sludge conditioning method of modifying |
| CN111875100A (en) * | 2020-07-28 | 2020-11-03 | 南京市生态环境保护科学研究院 | Process for pretreating wastewater from production of permanent-fixed red pesticide |
| CN112125496A (en) * | 2020-08-12 | 2020-12-25 | 浙江维美环保工程科技有限公司 | Production process for dehydrating and curing sludge |
| CN115536229A (en) * | 2022-09-19 | 2022-12-30 | 北京城市排水集团有限责任公司 | Automatic control system and method for chemical conditioning of advanced anaerobic digestion sludge |
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| CN101367597A (en) * | 2008-09-17 | 2009-02-18 | 广州绿由工业弃置废物回收处理有限公司 | Flocculating agent for sludge dewatering and sludge dewatering method |
| CN102603152A (en) * | 2012-03-08 | 2012-07-25 | 佛山市环保技术与装备研发专业中心 | Sludge deep dehydration conditioning agent and application thereof |
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2014
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101367597A (en) * | 2008-09-17 | 2009-02-18 | 广州绿由工业弃置废物回收处理有限公司 | Flocculating agent for sludge dewatering and sludge dewatering method |
| CN102603152A (en) * | 2012-03-08 | 2012-07-25 | 佛山市环保技术与装备研发专业中心 | Sludge deep dehydration conditioning agent and application thereof |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105923951A (en) * | 2016-06-21 | 2016-09-07 | 四川新开元环保工程有限公司 | Activated sludge stabilizing treatment method for sewage treatment |
| CN109179927A (en) * | 2018-09-20 | 2019-01-11 | 重庆三峡学院 | A kind of method of the circulating processing of excess sludge |
| CN109179927B (en) * | 2018-09-20 | 2021-07-23 | 重庆三峡学院 | Method for circularly treating excess sludge |
| CN109592880A (en) * | 2018-11-28 | 2019-04-09 | 湖州智清环保科技有限公司 | Landfill leachate generates sludge conditioning method of modifying |
| CN111875100A (en) * | 2020-07-28 | 2020-11-03 | 南京市生态环境保护科学研究院 | Process for pretreating wastewater from production of permanent-fixed red pesticide |
| CN111875100B (en) * | 2020-07-28 | 2021-04-27 | 南京市生态环境保护科学研究院 | Process for pretreating wastewater from production of permanent-fixed red pesticide |
| CN112125496A (en) * | 2020-08-12 | 2020-12-25 | 浙江维美环保工程科技有限公司 | Production process for dehydrating and curing sludge |
| CN115536229A (en) * | 2022-09-19 | 2022-12-30 | 北京城市排水集团有限责任公司 | Automatic control system and method for chemical conditioning of advanced anaerobic digestion sludge |
| CN115536229B (en) * | 2022-09-19 | 2024-08-09 | 北京城市排水集团有限责任公司 | Automatic control system and method for chemical conditioning of advanced anaerobic digested sludge |
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Application publication date: 20141119 |
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