CN103508648B - Sludge substance deep dehydrating method based on thermal conditioning coupling filter pressing - Google Patents
Sludge substance deep dehydrating method based on thermal conditioning coupling filter pressing Download PDFInfo
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- CN103508648B CN103508648B CN201310451590.5A CN201310451590A CN103508648B CN 103508648 B CN103508648 B CN 103508648B CN 201310451590 A CN201310451590 A CN 201310451590A CN 103508648 B CN103508648 B CN 103508648B
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- 239000010802 sludge Substances 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 37
- 230000003750 conditioning effect Effects 0.000 title claims abstract description 30
- 230000008878 coupling Effects 0.000 title claims abstract description 9
- 238000010168 coupling process Methods 0.000 title claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 9
- 238000003825 pressing Methods 0.000 title claims abstract description 6
- 239000000126 substance Substances 0.000 title abstract 2
- 230000018044 dehydration Effects 0.000 claims abstract description 56
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 56
- 239000000706 filtrate Substances 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 15
- 238000005265 energy consumption Methods 0.000 claims abstract description 11
- 239000012065 filter cake Substances 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 238000001914 filtration Methods 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 8
- 229920006395 saturated elastomer Polymers 0.000 claims description 7
- 238000001704 evaporation Methods 0.000 claims description 6
- 230000008020 evaporation Effects 0.000 claims description 6
- 238000009997 thermal pre-treatment Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 238000009834 vaporization Methods 0.000 claims description 3
- 230000008016 vaporization Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000001027 hydrothermal synthesis Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 238000010025 steaming Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 10
- 238000004065 wastewater treatment Methods 0.000 description 8
- 230000001662 opsonic effect Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 238000006114 decarboxylation reaction Methods 0.000 description 3
- 238000010335 hydrothermal treatment Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000002361 compost Substances 0.000 description 2
- 238000005906 dihydroxylation reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002207 metabolite Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
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- 239000007790 solid phase Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to a sludge substance deep dehydrating method based on thermal conditioning coupling filter pressing, belongs to the field of sludge treatment, is suitable for dehydration of various kinds of sludge, and particularly suitable for dehydration of surplus sludge. The method comprises the following steps: firstly carrying out heat exchange to a high temperature filtrate and the sludge, injecting the sludge with the raised temperature in a thermal conditioning processing unit, and performing a sufficient hydrothermal reaction at 120-250 DEG C; then immediately performing filter processing and dehydrating under the pressure to remove the moisture in a liquid state; at last, decompressing the high temperature sludge filter cake with pressure, further steaming and dehydrating with the sludge own high temperature and heat, so as to improve the dehydrating efficiency. The dehydrating method can improve sludge structure, physicochemical property and moisture distribution, save and fully utilize the heat, realize high-dryness and low-energy consumption dehydration of sludge, and improve the recycling value of the sludge.
Description
Technical field
The present invention relates to a kind of mud class material deep dehydration method based on heat conditioning coupling press filtration, be applicable to the processed of various classification mud, be specially adapted to the processed of excess sludge, belong to field of sludge treatment.
Background technology
In view of People's Republic of China's environmental regulation " urban wastewater treatment firm pollutant emission standard " enforcement (GB18918-2002), the sewage quantity of processing through sewage work increases year by year, thereby cause the excess sludge quantity that sewage work produces also increasing year by year, and quantity is huge.According to the sewage discharge data in " China Environmental State Bulletin ", consider that solid content in China's sanitary sewage is 0.015% and the average treatment efficiency of urban wastewater treatment firm simultaneously, estimation China urban wastewater treatment firm produces the surplus sludge volume that water ratio is 80%, its numerical value has been increased to 1854.94 ten thousand tons of 2010 fast from 353.54 ten thousand tons in 2004, and is increasing with the speed of nearly more than 250 ten thousand tons every year.So a large amount of excess sludges must effectively be processed and recycle, to realize the Sustainable development of dirty wastewater treatment.
To be dirty waste water produce utilizing in biological process treating processes excess sludge, is made up of the organism in the dirty waste water of a large amount of microorganisms and meta-bolites and absorption and inorganics, has the biomass solid of high organic content and high-moisture percentage.Because the EPS in excess sludge has fettered a large amount of moisture by electrostatic attraction, hydrogen bond action, physics and chemistry absorption and encapsulation, make mud belong to difficult dehydrated material, conventionally the moisture in mud is divided into free water, gap moisture, surface adsorption moisture and internal junction Heshui and divides.
For final treatment and disposal methods of mud such as Sludge landfill, aerobic compost, soil utilization and burnings, all the water ratio in mud is proposed to certain requirement." household refuse landfill sites pollution control criterion " (GB16889-2008) regulation municipal sludge enters Sanitary Landfill moisture percentage in sewage sludge and must be less than 60%; " urban wastewater treatment firm pollutant emission standard " (GB18918-2002) when regulation aerobic compost the water ratio of mud must be less than 65%; " urban wastewater treatment firm sludge disposal afforestation shale " (CJ248-2007) regulation afforestation must be less than 45% with shale water ratio; " urban wastewater treatment firm sludge disposal burns separately with shale " (CJ/T290-2008) when regulation mud self-sustaining burning the water ratio of mud must be less than 50%.So deeply dehydrating sludge is the only way which must be passed of sludge treatment and disposal.
Now widely used mechanical dehydration and heated drying dehydration all have some limitations, for example, mechanical dehydration is difficult to make the water ratio of mud to drop to below 75% conventionally, and the energy consumption of heat energy drying and dehydrating is very high, therefore be necessary very much to seek a kind of high-efficiency low energy consumption mud dewatering method.Hydrothermal treatment consists is early in the twentieth century grow up a kind of in order to simulate the technological method of carbon containing biomass coalification process, belongs to physical-chemical reaction process.The reaction such as dehydration and decarboxylation occurring in water-heat process makes solid phase prod not only have higher calorific value, and shows obvious hydrophobic property.Therefore, mechanical dehydration and hydro-thermal conditioning processing are organically combined to the high mass dryness fraction less energy-consumption dehydration that not only can realize excess sludge, and can improve effective recycle value of excess sludge.
Summary of the invention
In view of the characteristic of sludge dewatering difficulty, mud is finally processed the defect of disposing the requirement of sludge dewatering and current heat energy and mechanical dehydration combination dewatering type, the invention provides a kind of mud class material deep dehydration method based on heat conditioning coupling press filtration, not only utilize heat energy to improve sludge structure, physicochemical characteristic and moisture distribution, improve filter-press dehydration efficiency, and in mud, moisture is mainly removed by press filtration with liquid form, avoid the heat energy consumption of moisture vaporization, the heat energy (heat energy containing in high temperature filtrate) that simultaneously in mud, moisture absorbs in water-heat process be recycled (preheating mud), the heat energy that in mud, solid absorbs is also further utilized (dehydration by evaporation), reduce dehydration energy consumption, heat conditioning treating processes belongs to exothermic process simultaneously, effectively save energy consumption input, the calorific value of the heat conditioning treating product finally obtaining significantly improves, be conducive to later use and the disposal of dewatered sludge.
What the present invention proposed is a kind of mud class material deep dehydration method based on heat conditioning coupling press filtration, carries out according to the following steps:
1) mud in present method refers to Sewage Plant, water purification plant's excess sludge, mud or other the high-moisture percentage paste mud class material of digested sludge after concentrated and mechanical dehydration;
2) mud carries out heat exchange in thermal pretreatment unit and high temperature filtrate, reclaims on the one hand the heat energy of high-temperature high-pressure drainage, promotes self temperature; High temperature filtrate temperature can be down on the other hand to atmospheric boil following to get rid of band pressing system;
3) be heated to more than 120 DEG C in airtight hydrothermal treatment consists unit through the mud of preheating, stop certain hour and carry out heat conditioning, in heat conditioning process, mud fully carries out the reactions such as dehydroxylation, decarboxylation and hydrolysis, has improved sludge structure, physics-chem characteristic and moisture distribution;
4) mud after heat conditioning completely injects immediately filter-press dehydration processing unit under hot state, in filter-press dehydration processing unit, be filled with in advance the gases such as air, and the saturated vapor pressure of moisture while making air pressure higher than relevant temperature, so that the moisture in mud does not seethe with excitement, certain hour under effective action of mechanical pressure of 0.3～10MPa, in mud, moisture is removed with liquid form, has avoided the heat energy consumption of moisture vaporization, has obtained high-temperature liquid state filtrate; High-temperature liquid state filtrate in Filtrate collection device is reclaimed heat energy through interchanger, and improves mud temperature for mud thermal pretreatment unit, both can reduce the energy input in sludge hot conditioning treating processes, makes filtrate temperature reduce simultaneously; Low temperature liquid filtrate is carried out pressure release processing, obtains low-temperature atmosphere-pressure filtrate, then low-temperature atmosphere-pressure filtrate is carried out to purifying treatment;
5) high temperature sludge filter cake with pressure is carried out to pressure release, utilize the further dehydration by evaporation of mud self high temperature and heat, until mud temperature is down to normal temperature, collect high mass dryness fraction filter cake;
6) vaporous water producing in process divides after condensation process, enters filtrate purifying treating unit and carries out purifying treatment, and the moisture after purifying treatment can be used as the carrier of interchanger exchange heat energy.
Principal feature of the present invention:
1) mud in present method refers to Sewage Plant, water purification plant's excess sludge, mud or other the high-moisture percentage paste mud class material of digested sludge after concentrated and mechanical dehydration.
2) certain hour is processed in mud heat conditioning at 120～250 DEG C, the steel bomb of mud granule strengthens, physics-chem characteristic (size-grade distribution, surface charge, hydrophobicity, rheological properties) changes, the very big improvement of the moisture distribution in mud and grain pattern, can significantly reduce the combination of moisture and mud granule.
3) in heat conditioning treating processes, cell rupture, discharges moisture in born of the same parents, in born of the same parents, with extracellular macromolecule organism, the reactions such as dehydroxylation, decarboxylation and hydrolysis mainly occur, moisture distribution transforms to easy dehydration direction simultaneously, and C and H content significantly increase, O content reduces, and has improved sludge calorific value.
4) sludge hot conditioning treating processes is exothermic process, effectively energy efficient input after hydro-thermal reaction starts.
5) mud carries out hot opsonic reaction within the scope of 120～250 DEG C, not only be conducive to the carrying out of heat dehydration, and avoid organism in mud that excess Temperature (>250 DEG C) causes to decompose in a large number, suppress the generation of the caramelization of Maillard reaction and carbohydrate, reduced the difficulty that filtrate is processed.
6) mud and high temperature filtrate are carried out heat exchange, can reclaim the heat energy of high-temperature high-pressure drainage, promote self temperature; Again can be by high temperature filtrate temperature drop to being with pressing system to get rid of below atmospheric boil.
7) heat conditioning processing unit need have good thermotolerance and stopping property, the air pressure of mud in hot opsonic reaction processing unit by mud in the saturated vapor pressure that produces of moisture, gas atmosphere and the corresponding barometric point that hot opsonic reaction produces form.
8) before the mud after hot opsonic reaction is complete injects filter-press dehydration processing unit, filter-press dehydration processing unit need to be filled with the gases such as air, the saturated vapor pressure of moisture while making air pressure higher than relevant temperature, can suppress the evaporation of moisture in mud, avoid the heat energy consumption of moisture evaporation, made the moisture removing through press filtration be high-temperature liquid state.
9) owing to being to carry out filter-press dehydration under hot conditions, filtrate temperature is higher, has significantly reduced filtrate viscosity, contributes to the raising of filter-press dehydration speed.
10) after dehydration, the water ratio of filter cake is low, can realize the deep dehydration of excess sludge.
11) hot conditioning can be that intermittent operation mode can be also continuously-running duty, and filter-press dehydration process is intermittent operation mode.
In sum, this processing method of sludge dewatering takes full advantage of the advantage of hydrothermal treatment consists and mechanism filter-pressing dehydration, there is heat energy utilization abundant, dewatering efficiency is high, the low characteristic of dehydration energy consumption, the dewatered cake of low-water-content can meet the variation utilization of mud and the requirement of disposal, for the normal operation that affects urban wastewater treatment firm due to a large amount of excess sludges provides new solution route.
Brief description of the drawings
Accompanying drawing is a kind of mud class material deep dehydration method schema based on heat conditioning coupling press filtration.
Embodiment
As shown in the figure, the mud class material deep dehydration method based on heat conditioning coupling press filtration that the present invention proposes, comprises the following steps:
(1) mud is joined in mud thermal pretreatment unit by sludge pump.
(2) mud stops 30～60 minutes in thermal pretreatment unit, and the mud after preheating pumps in heat conditioning processing unit by pump.
(3) mud is heated to 120～250 DEG C in heat conditioning processing unit, stops 10～90 minutes at this temperature.
(4) before heat conditioning is finished dealing with, in filter-press dehydration processing unit, be filled with the gases such as air, the saturated vapor pressure of moisture while making air pressure higher than relevant temperature.
(5) mud after hot opsonic reaction is transferred to immediately in filter-press dehydration processing unit with pressure, press filtration 10～30 minutes under effective mechanical pressure of 0.3～10MPa, carry out filter-press dehydration, regulate the air pressure regulator in filter-press dehydration processing unit simultaneously, make the air pressure held stationary in filter-press dehydration processing unit.
(6) the high-temperature liquid state filtrate in Filtrate collection device is through interchanger, and heat is wherein recovered, and the heat energy of recovery is for preheating mud.
(7) filtrate by interchanger is carried out to pressure release processing, obtain the liquid filtrate of atmospheric low-temperature.
(8) high temperature sludge filter cake with pressure is carried out to pressure release, utilize the further dehydration by evaporation of mud self high temperature and heat, until mud temperature is down to normal temperature, collect high mass dryness fraction filter cake.
(9) water vapor that self-evaporatint n. produces is collected through condensation, carries out purifying treatment with together with filtrate after cooling, and the moisture after purifying treatment is as the carrier of interchanger exchange heat energy.
(10) loop according to the method described above the processed of next batch mud.
Claims (5)
1. the mud class material deep dehydration method based on heat conditioning coupling press filtration, is characterized in that following steps:
1) mud carries out heat exchange in thermal pretreatment unit and high-temperature liquid stream, reclaims the heat energy of high-temperature high-pressure drainage, promotes self temperature, high-temperature liquid is flowed to temperature simultaneously and is down to below atmospheric boil to discharge band pressing system; Described mud refers to Sewage Plant, water purification plant's excess sludge, the mud of digested sludge after concentrated and mechanical dehydration;
2) in airtight heat conditioning processing unit, be heated to 120～250 DEG C through the mud of preheating, stop and within 10～90 minutes, carry out heat conditioning; Heating temperature and the residence time, adjust according to sludge quality and the dehydrating effect that need to reach;
3) mud after heat conditioning injects immediately filter-press dehydration processing unit under hot state, the saturated vapor pressure of the moisture during higher than relevant temperature of the air pressure in filter-press dehydration processing unit, moisture in mud is not seethed with excitement, press filtration 10～30 minutes under the effective mechanical pressure of 0.3～10Mpa, in mud, moisture is removed with liquid form, has avoided the heat energy consumption of moisture vaporization; High-temperature liquid state filtrate in Filtrate collection device is through interchanger, heat is delivered to mud thermal pretreatment unit, reclaim heat energy, for preheating mud, reduce the energy input in sludge hot conditioning treating processes, filtrate temperature reduces simultaneously, and low temperature liquid filtrate is carried out pressure release processing, obtain low-temperature atmosphere-pressure filtrate, and filtrate is carried out to purifying treatment;
4) high temperature sludge filter cake with pressure is carried out to pressure release, utilize the further dehydration by evaporation of mud self high temperature and heat, until mud temperature is down to normal temperature, the water vapor that self-evaporatint n. produces is collected through condensation, carry out purifying treatment with together with filtrate after cooling, the moisture after purifying treatment is as the carrier of interchanger exchange heat energy;
5) dismantle filter-press dehydration processing unit, collect high mass dryness fraction filter cake.
2. mud class material deep dehydration method according to claim 1, is characterized in that: heat conditioning is intermittent operation mode or continuously-running duty, and filter-press dehydration process is intermittent operation mode.
3. mud class material deep dehydration method according to claim 1 and 2, is characterized in that: the heat in high-temperature liquid state filtrate reclaims by interchanger and for preheating mud.
4. mud class material deep dehydration method according to claim 1 and 2, is characterized in that: before filter-press dehydration, be filled with air at filter-press dehydration processing unit, the saturated vapor pressure of moisture while making air pressure higher than relevant temperature.
5. mud class material deep dehydration method according to claim 3, is characterized in that: before filter-press dehydration, be filled with air at filter-press dehydration processing unit, the saturated vapor pressure of moisture while making air pressure higher than relevant temperature.
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| CN109052892B (en) * | 2018-07-27 | 2020-08-18 | 西安交通大学 | Device and method for treating high-water-content organic matter |
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| CN105366909B (en) * | 2015-11-11 | 2018-02-09 | 中国电建集团中南勘测设计研究院有限公司 | A kind of technique of deeply dehydrating sludge |
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| JP4878079B2 (en) * | 2001-01-23 | 2012-02-15 | 月島機械株式会社 | Water treatment sludge treatment method and treatment apparatus |
| CN102428044A (en) * | 2009-03-18 | 2012-04-25 | 克莉雅沃特泰科有限公司 | Sludge hydrolysis device, a sludge hydrolysis method using the same, and a contact type of heat exchange unit and steam type of heat exchange unit provided in the sludge hydrolysis device |
| JP5244692B2 (en) * | 2009-05-12 | 2013-07-24 | 株式会社宇野澤組鐵工所 | Slurry processing plant |
| CN103274572A (en) * | 2013-05-28 | 2013-09-04 | 国新天汇环境有限公司 | Treatment method of organic solid waste |
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