CN102249514A - Low-energy drying treatment method for discharged sludge - Google Patents
Low-energy drying treatment method for discharged sludge Download PDFInfo
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- CN102249514A CN102249514A CN2010101798330A CN201010179833A CN102249514A CN 102249514 A CN102249514 A CN 102249514A CN 2010101798330 A CN2010101798330 A CN 2010101798330A CN 201010179833 A CN201010179833 A CN 201010179833A CN 102249514 A CN102249514 A CN 102249514A
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Abstract
The invention discloses a low-energy drying treatment method for discharged sludge. The method comprises the following steps: after adding water into discharged sludge in a first reaction tank so as to carry out physical degradation on the discharged sludge and then uniformly stirring the obtained mixture completely, conveying the obtained discharged sludge with water content of 80% to a second reaction tank; adding a chemical reagent into the second reaction tank so as to carry out chemical conditioning and modification on the discharged sludge, then carrying out mechanical filter pressing on the sludge so as to reduce the water content of the sludge to 40-45%, and preparing the sludge into mud cakes; and ventilating and drying the mud cakes in a greenhouse shed so as to reduce the content content of the sludge to 20-30%. The method disclosed by the invention is suitable to be applied to the reclamation and reduction treatment of discharged sludge of municipal wastewater treatment plants, and the volume of the treated sludge is reduced by more than 70%, thereby effectively saving landfill land resources; the sludge treatment method is simple in operation, low in cost and low in energy consumption; by using the method disclosed by the invention, harmful substances in the sludge can be degraded completely, thereby avoiding the secondary pollution to the environment; meanwhile, the mud cakes can be directly used as boiler fuel so as to recycle heat energy.
Description
Technical field
The present invention relates to a kind of method for sludge treatment, particularly the mud low energy drying method for treating that dispatches from the factory of municipal wastewater treatment plant.
Background technology
Along with the pay attention to day by day of people to environment protection; various places are built sewage work in succession; the processing power of sewage and the generation of mud all increase sharp; contain multiple harmful substances in the mud; as: hardly degraded organic substance; carcinogenic, teratogenesis, mutagenic hazardous compound, heavy metal ion, pathogenic micro-organism etc.The high metachromia of mud has caused higher environmental risk, simultaneously its refractory organics and high-moisture percentage makes the difficulty of actual sludge treatment big again, expense is high.The processing of mud becomes problem urgent and severe day by day in the environment protection with disposal.The quickening of current Urbanization in China, town sewage work also builds many more more, but for a long time, people have given more concern to sewage disposal technology, treatment process is increasingly mature, and the processing standard also improves gradually, yet not enough to the processing power of mud.Although spent lot of manpower and material resources and financial resources have been administered sewage, mud can not get effective processing, has offset the environment protection meaning of sewage disposal greatly.
Most countries is dispatched from the factory with the standard of water ratio 80% for sludge of sewage treatment plant at present, adopts landfill, burning and soil utilization to wait until the method disposal.
The soil utilization can be turned waste into wealth mud, but most content have the objectionable impuritiess such as organism of heavy metal ion, difficult degradation in the mud, is difficult to reach the standard that the soil utilizes.
Burning and processing sludge is to realize sludge treatment disposal minimizing, stabilization, innoxious, resource utilization degree most effectual way, but the mud through mummification does not directly burn not only very difficult, and it is extremely uneconomical, thereby this disposal options need be with sludge drying, thereby cause the residence height of investment and working cost, its reason is relevant with the big energy of sludge drying dehydration consumption, the standard aqueous rate of sludge incineration is 45%, at present except with also there not being other method to make moisture percentage in sewage sludge reduce to this level the heat energy mummification.
The standard mud of water ratio 80% dispatches from the factory, and to be used for the required cost of landfill minimum, but it will take a large amount of land resources, and the environment around the landfill place also can worsen, and very easily causes secondary pollution.China's major part is still carried out landfill at present, and this mode has had high requirement again to the moisture percentage in sewage sludge index.By national new standard regulation, water ratio just can carry out landfill smaller or equal to 60%, and can not the full dose landfill, must a ratio of mixture be arranged with rubbish, is less than 8%.Bring new problem order to us thus, if mud will carry out landfill, water ratio further descends so.From domestic and international situation, fail at present to see to make sludge dewatering reduce to practical methods below 60%.
For the treatment and disposal of mud, reduce moisture significantly and be crucial, the mud of low-water-content is transportation, sanitary landfill, burning and reclaims by burning that heat energy creates conditions in the mud.In the process type that significantly reduces sludge water content,, the energy and resource are reclaimed, to reduce the pollution and the treatment and disposal cost of mud by adjusting and reforming sludge quality.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of simple to operate, expense is cheap, power consumption is low, nuisance is degraded completely, makes the lower method for sludge treatment of water ratio.
The object of the present invention is achieved like this: the mud that dispatches from the factory cracks through add water physics in first retort, and be delivered to after stirring in second retort, add chemical agent and carry out the chemical conditioning modification in second retort, the mud after the modification becomes water ratio 40～45% mud cakes through mechanism filter-pressing.
It is to stir mud and water evenly broken in first retort by weight 1: 0.6～1.2 that the above-mentioned mud low energy drying method for treating that dispatches from the factory, described physics crack process.
It is with mud helical stir 6～20 minutes in first retort, 120 rev/mins of rotating speeds that the above-mentioned mud low energy drying method for treating that dispatches from the factory, described physics crack process.
The above-mentioned mud low energy drying method for treating that dispatches from the factory, described chemical conditioning modifying process are to add following chemical agent in second retort:
(a) transfer the pH value medicament, press pH7-10 scope control add-on, it is selected from following a kind of material, alkali, lime white, unslaked lime (100～140 order);
(b) tensio-active agent, consumption is by weight below 1%, and it is selected from following a kind of material, emulsifying agent, cation emulsified silicone oil, dimethyl silicone oil, organic fluorine tensio-active agent;
(c) flocculation agent, consumption is by weight below 0.5%, and it is selected from following a kind of material, polyacrylamide PAM, aluminium chlorohydroxide PAC, ferric sulfate Fe2 (SO4) 3, Tai-Ace S 150 Al2 (SO4) 3, poly-aluminum ferric chloride sulfate, carboxyl methyl cellulose;
(d) flocculating aids, consumption is by weight below 2%, and it is selected from following a kind of material, diatomite, flyash, coal gangue, perlite, breeze, unslaked lime, sodium base Peng Run soil, cinder,
The chemical agent of mud and interpolation is stirred in second retort.
The above-mentioned mud low energy drying method for treating that dispatches from the factory, described chemical conditioning modifying process are that the chemical agent with mud and interpolation stirred 60 rev/mins of rotating speeds 6～30 minutes in second retort.
The above-mentioned mud low energy drying method for treating that dispatches from the factory, described mechanism filter-pressing process are that the slurry of the mud after the chemical conditioning modification is pressed in the plate-and-frame filter press, and by the moisture of mud in the pressure filtration sheet frame, the mud in the sheet frame is promptly made mud cake.
The above-mentioned mud low energy drying method for treating that dispatches from the factory, sheet frame spatial volume thickness is adjustable in the described plate-and-frame filter press, the output hmc is adjustable within 8～20mm, mud pressure in the described sheet frame maintains below the 0.3MPA, kept 5～10 minutes, restart pressurizing device, keeping the interior Sludge Surface pressure of sheet frame is 0.3～16MPA, to the line that can not drip.
The above-mentioned mud low energy drying method for treating that dispatches from the factory, described mechanism filter-pressing process are that the slurry of the mud after the chemical conditioning modification is sent in the continuous rolling pressure filter, and process increases progressively pressing mode with sludge press filtration face roll-in mud extraction, and makes mud cake.
The above-mentioned mud low energy drying method for treating that dispatches from the factory, described continuous rolling pressure filter roll-in spacing is adjustable, and described mud is through having pressure in 0.1MPA, 0.3MPA, 0.5MPA, 0.7MPA, 1MPA, 1.5MPA, 16MPA press filtration face roll-in mud extraction.
The above-mentioned mud low energy drying method for treating that dispatches from the factory, described water ratio are that 40～45% mud cake changes in the airtight printing opacity greenhouse canopy, make temperature of shed maintain 25～60 ℃ under illumination; Perhaps, above-mentioned moisture content of the cake is reduced to 20～30% through the ventilation mummification.
Adopt above-mentioned method for sludge treatment, at first the mud that dispatches from the factory of municipal wastewater treatment plant is evenly realized the purpose that physics cracks through thin up and high-speed stirring, this physics cracks without any need for heat energy; Adding an amount of accent pH value medicament, tensio-active agent, flocculation agent, these chemical agents of flocculating aids again carries out the chemical conditioning modification and handles, this processing process can be with nuisance in the mud such as organism, carcinogenic, teratogenesis, mutagenic hazardous compound, heavy metal ion, pathogenic micro-organisms etc. are degraded thoroughly, and helps mud and make mud cake; Above-mentioned mud physical chemistry treating processes uses equipment few, has only used retort, whipping device and conveyer, and the chemical agent type of adding is commonly used, optional kind is many and consumption is few; Through the slurry of the mud after the chemical conditioning modification is 40～45% mud cake through making water ratio after plate-and-frame filter press or the press filtration of continuous rolling pressure filter again, through sunshine or ventilation mummification moisture content of the cake is reduced to 20～30% at last, above-mentioned pressure filtration moisture and the treating processes of mummification is simple to operate, the power consumption is low; In sum, operation is simple, working cost is cheap, power consumption is low for this mud low energy drying method for treating that dispatches from the factory, the nuisance degraded thoroughly in the mud, avoided second environmental pollution, dehydration and drying efficient height, sludge volume after the processing is cut down more than 70%, has effectively saved the land resources of landfill, mud cake directly can also be reclaimed heat energy as boiler oil.
Description of drawings
Below in conjunction with accompanying drawing the present invention is described in further detail, but structure any limitation of the invention not.
Fig. 1 is a process flow sheet of the present invention.
Embodiment
As shown in Figure 1, the water ratio that method for sludge treatment of the present invention divided for four steps will dispatch from the factory mud 80% reduces to 20～30%, and makes mud cake.
The first step: physics cracks process, realizes by following scheme:
With mud and water by weight 1: 0.6～1.2 in first retort helical stir 6～20 minutes, 120 rev/mins of rotating speeds, concrete as with mud and water by weight 1: 0.6 helical stir 6 minutes or in first retort by weight 1: 1 helical stir 10 minutes or in first retort by weight 1: 1.2 helical stir 20 minutes in retort, mainly assign to determine to add the proportion of water and the time of stirring according to the one-tenth of mud;
Second step: the chemical conditioning modifying process, the mud that cracks through the first step physics is delivered to the following chemical agent of interpolation in second retort:
(a) transfer the pH value medicament, press pH7～10 scopes control add-on, it is selected from following a kind of material, alkali, lime white, unslaked lime (100～140 order), it is concrete that alkali transfers to pH7-10 with the pH value or the pH value is transferred to pH7-10 to the adding lime white or adding unslaked lime (100～140 order) transfers to pH7-10 with the pH value as adding;
(b) tensio-active agent, consumption is by weight below 1%, it is selected from following a kind of material, emulsifying agent, cation emulsified silicone oil, dimethyl silicone oil, organic fluorine tensio-active agent are specifically as 0.1% adding emulsifying agent or the 0.5% cation emulsified silicone oil of adding or 0.8% adding dimethyl silicone oil or 1% adding organic fluorine tensio-active agent by weight by weight by weight by weight;
(c) flocculation agent, consumption is by weight below 0.5%, and it is selected from following a kind of material, polyacrylamide PAM, aluminium chlorohydroxide PAC, ferric sulfate Fe
2(SO
4)
3, Tai-Ace S 150 Al
2(SO
4) 3, poly-aluminum ferric chloride sulfate, carboxyl methyl cellulose, concrete as add polyacrylamide PAM or add ferric sulfate Fe by weight 0.3% by weight 0.1%
2(SO
4)
3, or add poly-aluminum ferric chloride sulfate or add carboxyl methyl cellulose by weight 0.5% by weight 0.4%;
(d) flocculating aids, consumption is by weight below 2%, it is selected from following a kind of material, diatomite, flyash, coal gangue, perlite, breeze, unslaked lime, sodium base Peng Run soil, cinder are specifically as 0.5% adding diatomite or 1% adding flyash or 1.5% adding sodium base Peng Run soil or 2% adding cinder by weight by weight by weight by weight;
The chemical agent of mud and interpolation is fully stirred in second retort, and the rotating speed of stirring is 60 rev/mins, and churning time is 6～30 minutes, and is concrete as 6 minutes or 10 minutes or 20 minutes or 30 minutes;
The 3rd step: it is 40～45% mud cake that mechanism filter-pressing process, the mud after the processing have been made water ratio, realizes by two kinds of following schemes:
(1) slurry of the mud after the chemical conditioning modification is pressed in the plate-and-frame filter press, wherein sheet frame volume space thickness is that 8～20mm is adjustable, mud pressure in the sheet frame maintains below the 0.3MPA, concrete as 0.1MPA or 0.3MPA, kept 5～10 minutes, concrete as 5 minutes or 8 minutes or 10 minutes, restart pressurizing device, keeping the interior Sludge Surface pressure of sheet frame is 0.3～16MPA, concrete as 0.3MPA or 0.5MPA or 1MPA or 1.5MPA or 3MPA or 10MPA or 16MPA, to the line that can not drip;
(2) slurry of the mud after the chemical conditioning modification is sent in the continuous rolling pressure filter, its roll-in spacing is adjustable, and mud is through having pressure in 0.1MPA, 0.3MPA, 0.5MPA, 0.7MPA, 1MPA, 1.5MPA, 16MPA press filtration face roll-in mud extraction.
The water that filters out in the mechanism filter-pressing process can turn back to the first step physics and crack in the process, realizes the cycling and reutilization of water.
The 4th step: with water ratio is that 40～45% mud cake changes in the airtight printing opacity greenhouse canopy, makes temperature of shed maintain 25～60 ℃ under illumination, concrete as 25 ℃ or 40 ℃ or 60 ℃; Perhaps,, can use induced draft fan, machinery to stir the method for mud cake, above-mentioned moisture content of the cake is reduced to 20～30% in order to accelerate the mummification speed of mud through the ventilation mummification.
Mud cake after above-mentioned four steps handle can be delivered to boiler as inferior coal and burn also directly sanitary landfill.
The chemical agent proportioning one of above-mentioned chemical conditioning modifying process is: by gross weight than emulsifying agent 2201 consumptions be 0.5%, PAM consumption 0.1%, CMC consumption are 0.5%, sodium base Peng Run soil consumption is 0.5%, lime 1% is adjusted PH.
The chemical agent proportioning two of above-mentioned chemical conditioning modifying process is: cation emulsified silicon oil dosage is 0.5%, the CMC consumption is 0.7%, poly-aluminum ferric chloride sulfate 0.3%, cinder 0.5%, lime 2%.
Various places mud composition there are differences and with seasonal variation, the present invention can also belong to protection scope of the present invention equally according to actual adjusting.In a word,, should illustrate that obviously those skilled in the art can carry out various variations and remodeling though invention has exemplified above-mentioned preferred implementation.Therefore, unless such variation and remodeling have departed from scope of the present invention, otherwise all be included within protection scope of the present invention.
Claims (10)
1. mud low energy drying method for treating that dispatches from the factory, it is characterized in that: the described mud that dispatches from the factory cracks through add water physics in first retort, and be delivered to after stirring in second retort, add chemical agent and carry out the chemical conditioning modification in second retort, the mud after the modification becomes water ratio 40～45% mud cakes through mechanism filter-pressing.
2. the mud low energy drying method for treating that dispatches from the factory according to claim 1 is characterized in that: it is to stir mud and water evenly broken in first retort by weight 1: 0.6～1.2 that described physics cracks process.
3. the mud low energy drying method for treating that dispatches from the factory according to claim 2 is characterized in that: it is with mud helical stir 6～20 minutes in first retort, 120 rev/mins of rotating speeds that described physics cracks process.
4. the mud low energy drying method for treating that dispatches from the factory according to claim 1 is characterized in that: described chemical conditioning modifying process is to add following chemical agent in second retort:
(a) transfer the pH value medicament, press pH value 7～10 control add-ons, it is selected from following a kind of material, alkali, lime white, lime (100～140 order);
(b) tensio-active agent, consumption is by weight below 1%, and it is selected from following a kind of material, emulsifying agent, cation emulsified silicone oil, dimethyl silicone oil, organic fluorine tensio-active agent;
(c) flocculation agent, consumption is by weight below 0.5%, and it is selected from following a kind of material, polyacrylamide PAM, aluminium chlorohydroxide PAC, ferric sulfate Fe
2(SO
4)
3, Tai-Ace S 150 Al
2(SO
4)
3, poly-aluminum ferric chloride sulfate, carboxyl methyl cellulose;
(d) flocculating aids, consumption is by weight below 2%, and it is selected from following a kind of material, diatomite, flyash, coal gangue, perlite, breeze, sodium base Peng Run soil, unslaked lime, cinder,
The chemical agent of mud and interpolation is stirred in second retort.
5. the mud low energy drying method for treating that dispatches from the factory according to claim 4 is characterized in that: described chemical conditioning modifying process is that the chemical agent with mud and interpolation stirred 60 rev/mins of rotating speeds 6～30 minutes in second retort.
6. the mud low energy drying method for treating that dispatches from the factory according to claim 1, it is characterized in that: described mechanism filter-pressing process is that the slurry of the mud after the chemical conditioning modification is pressed in the plate-and-frame filter press, by the moisture of mud in the pressure filtration sheet frame, the mud in the sheet frame is promptly made mud cake.
7. the mud low energy drying method for treating that dispatches from the factory according to claim 6, it is characterized in that: the sheet frame volume space is adjustable in the described plate-and-frame filter press, the output hmc can be adjusted to 8～20mm, mud pressure in the described sheet frame maintains below the 0.3MPA, kept 5～10 minutes, start pressurizing device, keeping the interior Sludge Surface pressure of sheet frame is 0.3～16MPA, to the line that can not drip.
8. the mud low energy drying method for treating that dispatches from the factory according to claim 1, it is characterized in that: described mechanism filter-pressing process is that the slurry of the mud after the chemical conditioning modification is sent in the continuous rolling pressure filter, process increases progressively pressing mode with sludge press filtration face roll-in mud extraction, and makes mud cake.
9. the mud low energy drying method for treating that dispatches from the factory according to claim 8, it is characterized in that: described continuous rolling pressure filter roll-in spacing is adjustable, and described mud is through having pressure in 0.1MPA, 0.3MPA, 0.5MPA, 0.7MPA, 1MPA, 1.5MPA, 16MPA press filtration face roll-in mud extraction.
10. the mud low energy drying method for treating that dispatches from the factory according to claim 1 is characterized in that: described water ratio is that 40～45% mud cake changes in the airtight printing opacity greenhouse canopy, makes temperature of shed maintain 25～60 ℃ under illumination; Perhaps, above-mentioned moisture content of the cake is reduced to 20～30% through the ventilation mummification.
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| CN102557387A (en) * | 2012-01-09 | 2012-07-11 | 济南大学 | Composite sludge flocculation and dehydration conditioner prepared from steel slag |
| CN102764634A (en) * | 2012-07-23 | 2012-11-07 | 黑旋风工程机械开发有限公司 | Formula of composite filter aid for shield engineering slurry |
| CN103030255A (en) * | 2012-12-28 | 2013-04-10 | 江苏兆盛环保集团有限公司 | Premodulation technology for concentrated advanced treatment of sludge |
| CN103056158A (en) * | 2012-12-05 | 2013-04-24 | 董长勋 | Chemical leaching method for repairing heavy metal contaminated soil |
| CN103058491A (en) * | 2013-01-10 | 2013-04-24 | 温州大学 | Composite filter-pressing centrifugal dehydrant |
| CN103193374A (en) * | 2013-05-03 | 2013-07-10 | 湖南品铸科技发展有限公司 | Sludge dewatering tempering agent and method for sludge dewatering by utilizing same |
| CN103241918A (en) * | 2012-08-07 | 2013-08-14 | 江苏绿威环保科技有限公司 | Intelligent conditioning system for deep dewatering of sludge |
| CN103613268A (en) * | 2013-12-03 | 2014-03-05 | 湖南科技大学 | Sludge dewatering conditioning agent and deep dewatering method thereof |
| CN103638744A (en) * | 2013-11-27 | 2014-03-19 | 鄂尔多斯市东源煤铝科技有限公司 | Method for improving filtering property of acid coal ash slurry |
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| CN107032567A (en) * | 2016-12-14 | 2017-08-11 | 广东科达洁能股份有限公司 | A kind of municipal sludge deodorization decrement method |
| CN107032568A (en) * | 2016-12-14 | 2017-08-11 | 广东科达洁能股份有限公司 | A kind of municipal sludge deodorization decrement treatment system |
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| CN108640451A (en) * | 2018-05-31 | 2018-10-12 | 中铁十七局集团第二工程有限公司 | A kind of purifying agent and preparation method suitable for bridge drilling mud |
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| CN102557387A (en) * | 2012-01-09 | 2012-07-11 | 济南大学 | Composite sludge flocculation and dehydration conditioner prepared from steel slag |
| CN102764634B (en) * | 2012-07-23 | 2014-11-26 | 黑旋风工程机械开发有限公司 | Formula of composite filter aid for shield engineering slurry |
| CN102764634A (en) * | 2012-07-23 | 2012-11-07 | 黑旋风工程机械开发有限公司 | Formula of composite filter aid for shield engineering slurry |
| CN103241918A (en) * | 2012-08-07 | 2013-08-14 | 江苏绿威环保科技有限公司 | Intelligent conditioning system for deep dewatering of sludge |
| CN103241918B (en) * | 2012-08-07 | 2015-01-21 | 江苏绿威环保科技有限公司 | Intelligent conditioning system for deep dewatering of sludge |
| CN103056158A (en) * | 2012-12-05 | 2013-04-24 | 董长勋 | Chemical leaching method for repairing heavy metal contaminated soil |
| CN103030255A (en) * | 2012-12-28 | 2013-04-10 | 江苏兆盛环保集团有限公司 | Premodulation technology for concentrated advanced treatment of sludge |
| CN103058491A (en) * | 2013-01-10 | 2013-04-24 | 温州大学 | Composite filter-pressing centrifugal dehydrant |
| CN103193374A (en) * | 2013-05-03 | 2013-07-10 | 湖南品铸科技发展有限公司 | Sludge dewatering tempering agent and method for sludge dewatering by utilizing same |
| CN103638744A (en) * | 2013-11-27 | 2014-03-19 | 鄂尔多斯市东源煤铝科技有限公司 | Method for improving filtering property of acid coal ash slurry |
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Application publication date: 20111123 |