CN106698886A - Low energy consumption drying treatment technology of residual activated sludge - Google Patents
Low energy consumption drying treatment technology of residual activated sludge Download PDFInfo
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- CN106698886A CN106698886A CN201510769122.1A CN201510769122A CN106698886A CN 106698886 A CN106698886 A CN 106698886A CN 201510769122 A CN201510769122 A CN 201510769122A CN 106698886 A CN106698886 A CN 106698886A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Abstract
The invention discloses a low energy consumption drying treatment technology of residual activated sludge. The treatment technology comprises the following steps: sending the residual activated sludge to a high speed shearing homogenizing tank, adding a treatment agent to the homogenizing tank, shearing and homogenizing the residual activated sludge and the treatment agent at 0-20 DEG C for 0.5-1 h, sending the obtained mixture to a sludge dehydrating machine, dehydrating the mixture to obtain a dehydrated sludge cake and sewage, sending the sewage to a sewage plant, further treating the sewage, sending the dehydrated sludge to a molding machine, extruding the dehydrated sludge to form strips, allowing the strips to enter a solar multilayer mesh belt type low temperature drying box through a conveyor belt, and drying the strips to obtain dried sludge with the water content being less than 15%. The technology decreases the water content of the residual sludge to 15% or less from 97% or above, and greatly reduces the volume of the sludge, and the dried sludge can be used as a further recycling raw material, or can be burnt.
Description
Technical field
The present invention relates to a kind of residual active sludge handling process, more particularly to a kind of excess sludge broken wall dehydration, low energy consumption drying and other treatment technique.
Background technology
Residual active sludge is the inevitable outcome in water treatment procedure.It is contained within many pathogens, virus and parasite etc., serious threat is caused to surrounding environment, and moisture percentage in sewage sludge is high, in sedimentation basin just the moisture percentage in sewage sludge separated about 97%~99%, the transport difficulty that the sludge of high-moisture percentage causes sludge is big, high cost, occupy a large amount of storage capacity of refuse landfill, the problems such as antiseepage requirement industry increase of landfill yard simultaneously, percolate blockage, great hidden danger is all brought to water environment and atmospheric environment.The dehydration and desiccation of sludge are the effective means of sludge reduction, are also the prerequisite of sludge final process.
Sludge dewatering has turned into Treatment of Sludge and a very important process in disposal process, sludge subsequent transportation, treatment cost of disposal is saved by reducing sludge volume and is very important.All there is bottleneck problem in existing mechanical sludge dewatering technique dewatering efficiency, reason is that mechanical dehydration is difficult to the intracellular combination water of removing.Sludge dewatering effect such as to be improved, it is necessary to crush sludge cell membrane is that internal combustion is water-soluble to be gone out just may be used.Therefore, the broken wall treatment of sludge is the problem urgently studied and solve in sludge dewatering.
The desiccation of sludge is the premise that sludge carries out resource (agricultural, burning etc.).At present, the drying technique of sludge has obtained more in-depth study, and many technologies have been applied.But there is the problems such as equipment investment is costly, and heating-up temperature operating cost high is high mostly, hinder sludge drying technique large-scale promotion and development.Desiccation operating cost can be greatly reduced using the method for solar energy desiccation sludge technology, is promoted for the more effective resource technology of sludge and facility is provided.
Zhang Zongyu, Li Jie, Zhao Hongming etc.（Environmental Management College of China's journal, volume 20 the 4th phase, 58-60 in 2010）" research of municipal sludge drying and incinerating integrated processing technique " is reported, be have studied and burning integral treatment is dried to sludge using revolving drum drier and fluidized bed incinerator.Sludge is dried using heat smoke direct contact heat transfer revolving drum drier wherein.Wet mud is moved with the rotation of cylinder, and under gravity from one section higher to relatively low one section of movement.Flight is disposed with cylinder, it constantly takes up wet mud, spills down, sludge is increased with the contact area of flue gas.The dry treatment process needs thermal source, i.e. heat smoke.As can not using thermal source also need introducing other thermals source could complete this drying process.
CN 102173557A disclose a kind of method for treating low-heating value excess sludge, comprise the following steps：Quick lime is stored in quick lime feed bin, and logical quick lime is stored in quick lime feed bin, and different amounts of quick lime is conveyed on demand in mixing reactor by reactant metering device, and quick lime addition is the 20-50 % of excess sludge quality；The excess sludge of pending moisture content 80-90% and quick lime feeding mixing reactor are sufficiently mixed reaction, semi-oriented sludge is made；Semi-oriented sludge is sent into sludge pelletizer, is broken between mud granule imports solar energy drying and is dried treatment, by the dried process of 24-48h, obtain the dewatered sludge that moisture content is 5-10%, the foul smell of generation imports emission-control equipment treatment.Moisture percentage in sewage sludge after invention treatment is low, and effect is good, and sludge is dried using solar energy, and using resource reduces cost, but the method is nursed one's health sludge using lime, and dewatering efficiency is not high and Lime-Injecting amount is big, increases subsequent treatment amount.Additionally, sludge is laid in drying room being dried, it is necessary to using mechanical reaction and sludge can not obtain continuous processing.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to provide a kind of energy-conservation, efficient, safe and environment-friendly residual active sludge low energy consumption drying and other treatment technique.The technique improves dewatering rate using medicament conditioning and mechanical breaking-wall method technology；Multi-deck mesh-belt type low temperature desiccation case does not need thermal source, and temperature is low and Dust Capacity is low, can avoid hidden peril of explosion, can sufficiently carry out counter current contact and disperse sludge, and dehydration resistance is small.
The present invention provides a kind of residual active sludge low energy consumption drying and other treatment technique, and the handling process comprises the following steps：
（1）By in residual active sludge feeding high speed shearing homogenizing groove, then to inorganic agent is added in homogenization groove, 0.5~1h is homogenized in 0~20 DEG C of down cut, described inorganic agent is nonionic surfactant and the mixed solution of ethoxy perhydro-s-triazine；
（2）By step（1）Sludge feeding sludge dewatering equipment after treatment is dehydrated, and obtains dehydrated sludge cake and sewage, and the sewage is sent to Sewage Plant and further processed；
（3）By step（2）The dehydrated sludge cake feeding forming machine of gained is extruded into strip, then enters solar energy multi-deck mesh-belt type low temperature desiccation case desiccation by conveyer belt, obtains dewatered sludge of the moisture content less than 15%.
In present invention process, step（3）Gained dewatered sludge can further recycling treatment or burning, drying process produce tail gas by air-introduced machine introduce tail gas unit process after empty, the exhaust gas processing device can be hypergravity exhaust gas processing device.
In present invention process, step（1）Described nonionic surfactant is made up of Determination of Polyoxyethylene Non-ionic Surfactants and APG, wherein, Determination of Polyoxyethylene Non-ionic Surfactants content is 20-99.9wt%, and APG content is 0.01-80wt%；The Determination of Polyoxyethylene Non-ionic Surfactants is APES（For one or two in OPEO and NPE）, high-carbon fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, the ethylene oxide adduct of polypropylene glycol, one or more in polyoxyethylated ionic surfactant.The nonionic surfactant addition and step（1）Described in residual active sludge Solid content weight ratio be 1:2000~1:1000, the addition and step of ethoxy perhydro-s-triazine（1）Described in residual active sludge Solid content weight ratio be 1:100~1:50.
In present invention process, step（2）The sludge dewatering equipment can be one or more in centrifugal dehydrator, plate and frame filter press, stacked sludge dewatering equipment, belt filter press.
In present invention process, step（1）The top fixed installation 3-5 root swingles of the high speed shearing homogenizing groove, with the 4-6 radium-shine cutting blade of six leaves on every swingle, the rotating speed of the swingle is 10000-30000r/min, preferably 20000r/min.
In present invention process, step（3）Sludge after the broken wall dehydration is extruded into strip, a diameter of 4-6mm of the strip sludge through forming machine.
In present invention process, step（3）Sludge after the shaping enters solar energy multi-deck mesh-belt type low temperature desiccation case through conveyer belt, the built-in multilayer of desiccation case can independently and the guipure that horizontally rotates, it is that carrier gas and sludge provide the space that can be fully contacted, sludge horizontal movement on guipure, air with perpendicular flow forms cross-flow, and air can pass through over from sludge, forms good counter current contact drying condition, dewatering efficiency can be improved, promotes sludge fast dewatering.When the sludge after shaping from top to bottom by guipure layer by layer when just have passed through drying and other treatment.The desiccation case draws the low temperature desiccation carrier gas for making desiccation case, temperature >=40 DEG C, humidity ＜ 10%, load volume 100-500m after air pump heats air through solar heater3/ h, sludge residence time in case is about 1~2h.
Compared with prior art, handling process of the present invention has following features：
1st, the inorganic agent used in present invention process is nonionic surfactant, the mixed solution of ethoxy perhydro-s-triazine composition, by the cooperative effect between each component in inorganic agent, so that the dewatering efficiency of sludge is greatly improved, sludge of the moisture content less than 15% can be obtained, microorganism wall cracks efficiency in raising sludge, dosing is reduced, shortens broken time, efficient energy-saving.Through the sludge after broken wall treatment, it is released with reference to water, flco dispersion is substantially reduced through the moisture content of the cake after dewater treatment, sludge dewatering efficiency is greatly improved to be accelerated with desiccation speed.
2nd, in present invention process, the nonionic surface active agent in inorganic agent used can make the hydrophilic radical such as sludge flco surface extracellular polymeric of macromolecular by solubilization and peptizaiton（EPS）It is transferred in supernatant, sludge flco particle diameter is diminished, the reduction of flco degree of irregularity makes part change into Free water with reference to water.
3rd, the sludge in the present invention after broken wall dehydration passes through banded extruder agent into strips.Shaped by extrusion, be conducive to dispersion and uniform sludge, reduce moisture removal resistance in sludge.
4th, the desiccation case in the present invention draws the low temperature desiccation carrier gas for making desiccation case after air pump heats air through solar heater.The built-in multilayer of desiccation case can be independently and the mesh belt structure that horizontally rotates that carrier gas provides the space that can be fully contacted with sludge.Sludge horizontal movement on guipure, the air with perpendicular flow forms cross-flow, and air can pass through over from sludge, forms good counter current contact drying condition, it is possible to increase dewatering efficiency, forms fast dewatering mechanism.When the sludge after shaping from top to bottom by guipure layer by layer when just have passed through drying and other treatment.The desiccation case need not introduce other thermals source, and energy consumption is low, and low-temperature treatment will not cause the danger such as dust explosion, and mud component volatilization is few.Moisture percentage in sewage sludge is down to less than 15% after desiccation.
Brief description of the drawings
Fig. 1 is residual active sludge low energy consumption drying and other treatment process flow diagram of the invention.
Wherein, 1- residual active sludges, 2- sludge pumps, 3- high speed shearing homogenizing grooves, 5- sludge dewatering equipments, 6- forming machines, 7- multi-deck mesh-belt type low temperature desiccation casees, 8- dewatered sludges, 9- solar heaters, 10- air, 11- air-introduced machines, 12- hypergravity exhaust gas processing devices, 14- inorganic agents, 16- sewage, 17- sewage treatment plants, 18- mud cakes, 19- tail gas.
Specific embodiment
With reference to embodiment, the present invention is further illustrated, but is not so limited the present invention.
The present invention as shown in Figure 1 is realized by following technical process：Residual active sludge 1 is pumped into high speed shearing homogenizing groove 3 by sludge pump 2, sludge mechanical breaking-wall method treatment is carried out after mixing with inorganic agent 14, sludge after broken wall carries out dewater treatment into dewaterer 5, obtain sludge and sewage, wherein sewage 16 enters sewage farm 17 and carries out subsequent treatment, the feeding forming machine 6 of mud cake 18 after dehydration is extruded into strip, low temperature drying and other treatment is carried out into solar energy multi-deck mesh-belt type low temperature desiccation case 7 by conveyer belt again, after multi-deck mesh-belt type low temperature desiccation case 7 is heated air 10 through solar heater 9 by air pump, as the low temperature desiccation carrier gas of desiccation case, the tail gas 19 that drying process is produced introduced by air-introduced machine 11 and emptied after hypergravity exhaust gas processing device 12 is processed, sludge 8 after desiccation can be used as further recycling treatment or burning.
Embodiment 1
The specific embodiment of the invention is illustrated by taking certain Love psychology Treatment stations excess sludge as an example.Each content analysis are shown in Table 1 in excess sludge raw material.To OPEO and 0.02% APG that 0.05%TS is added in the excess sludge that this kind of moisture content of 200kg is 96.7%, and after adding the ethoxy perhydro-s-triazine of 1%TS, start high speed shear knife carries out high speed shear broken wall 30min to sludge with 20000r/min rotating speeds；Sludge carries out centrifugal dehydration after broken wall, dehydrated sludge each content such as table 2 below, abjection sewage each index such as table 3 below, sewage is entered into sewage farm biochemistry unit to be further processed, mud cake is pressed into 4mm strips sludge through conveyer belt into solar energy multi-deck mesh-belt type low temperature desiccation case into filter press after dehydration, carrier gas is heated to 50 DEG C through solar pipe, and humidity is 8%, load volume 100m in case3/ h, sludge residence time in case is 1h, and moisture percentage in sewage sludge is down to 12.6% after drying.Excess sludge volume reduction nearly 91%.
The excess sludge material content analytical table of table 1.
| Moisture content（%） | Oil content (%) | Solid content (%) |
| 96.7 | 2.5 | 0.8 |
The dewatered cake content analysis table of table 2.
The dehydration filtrate content analysis table of table 3.
Embodiment 2
Substantially the same manner as Example 1, difference is that inorganic agent is the NPE and 0.04% APG of 0.08%TS, and adds the ethoxy perhydro-s-triazine of 1.5%TS, dried excess sludge moisture content to be down to 11.4%.Excess sludge volume reduction nearly 88%.
Embodiment 3
It is substantially the same manner as Example 1, difference be by solar energy multi-deck mesh-belt type low temperature desiccation case intake air temperature, load volume and in case the residence time be adjusted.Mud cake is pressed into 4mm strips sludge through conveyer belt into solar energy multi-deck mesh-belt type low temperature desiccation case into filter press after dehydration, and carrier gas is heated to 60 DEG C through solar pipe, and humidity is 5%, load volume 200m in case3/ h, sludge residence time in case is 1.5h, and moisture percentage in sewage sludge is down to 9.3% after drying.Excess sludge volume reduction nearly 87%.
Comparative example 1
Selected sludge is constituted with the excess sludge raw material of embodiment 1, selected handling process is with embodiment 1, but without addition ethoxy perhydro-s-triazine in inorganic agent used, to OPEO and 0.02% APG that 0.05%TS is added in the excess sludge that this kind of moisture content of 200kg is 96.7%, start high speed shear knife carries out high speed shear broken wall 30min to sludge with 2000 r/min rotating speeds；Sludge carries out centrifugal dehydration after broken wall, and dehydrated sludge filter cake moisture content is 78.29%, by after the PROCESS FOR TREATMENT of embodiment 1, dried excess sludge moisture content is down to 30.09%.Excess sludge volume reduction nearly 70%.
Claims (14)
1. a kind of residual active sludge low energy consumption drying and other treatment technique, the handling process comprises the following steps：
（1）By in residual active sludge feeding high speed shearing homogenizing groove, then to inorganic agent is added in homogenization groove, 0.5~1h is homogenized in 0~20 DEG C of down cut, described inorganic agent is nonionic surfactant and the mixed solution of ethoxy perhydro-s-triazine；
（2）By step（1）Sludge feeding sludge dewatering equipment after treatment is dehydrated, and obtains dehydrated sludge cake and sewage, and the sewage is sent to Sewage Plant and further processed；
（3）By step（2）The dehydrated sludge cake feeding forming machine of gained is extruded into strip, then enters solar energy multi-deck mesh-belt type low temperature desiccation case desiccation by conveyer belt, obtains dewatered sludge of the moisture content less than 15%.
2. according to the technique described in claim 1, it is characterised in that：Step（3）Gained dewatered sludge can further recycling treatment or burning, drying process produce tail gas by air-introduced machine introduce tail gas unit process after empty.
3. according to the technique described in claim 2, it is characterised in that：The exhaust gas processing device is hypergravity exhaust gas processing device.
4. according to the technique described in claim 1, it is characterised in that：Step（1）Described nonionic surfactant is made up of Determination of Polyoxyethylene Non-ionic Surfactants and APG.
5. according to the technique described in claim 4, it is characterised in that：In the nonionic surfactant, Determination of Polyoxyethylene Non-ionic Surfactants content is 20-99.9wt%, and APG content is 0.01-80wt%.
6. according to the technique described in claim 4, it is characterised in that：The Determination of Polyoxyethylene Non-ionic Surfactants is one or more in APES, high-carbon fatty alcohol polyoxyethylene ether, fatty acid methyl ester ethoxylate, the ethylene oxide adduct of polypropylene glycol, polyoxyethylated ionic surfactant.
7. according to the technique described in claim 6, it is characterised in that：The APES be OPEO and NPE in one or two.
8. according to the technique described in claim 1, it is characterised in that：The nonionic surfactant addition and step（1）Described in residual active sludge Solid content weight ratio be 1:2000~1:1000, the addition and step of ethoxy perhydro-s-triazine（1）Described in residual active sludge Solid content weight ratio be 1:100~1:50.
9. according to the technique described in claim 1, it is characterised in that：Step（2）The sludge dewatering equipment is one or more in centrifugal dehydrator, plate and frame filter press, stacked sludge dewatering equipment, belt filter press.
10. according to the technique described in claim 1, it is characterised in that：Step（1）The top fixed installation 3-5 root swingles of the high speed shearing homogenizing groove, with the 4-6 radium-shine cutting blade of six leaves on every swingle.
11. according to the technique described in claim 1, it is characterised in that：The rotating speed of the swingle is 10000-30000r/min.
12. according to the technique described in claim 1, it is characterised in that：Step（3）Sludge after the broken wall dehydration is extruded into strip, a diameter of 4-6mm of the strip sludge through forming machine.
13. according to the technique described in claim 1, it is characterised in that：Step（3）Sludge after the shaping enters solar energy multi-deck mesh-belt type low temperature desiccation case through conveyer belt, and the built-in multilayer of desiccation case can independently and the guipure that horizontally rotates.
14. according to the technique described in claim 1, it is characterised in that：The desiccation case draws the low temperature desiccation carrier gas for making desiccation case, temperature >=40 DEG C, humidity ＜ 10%, load volume 100-500m after air pump heats air through solar heater3/ h, sludge residence time in case is about 1~2h.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109231767A (en) * | 2018-10-15 | 2019-01-18 | 杭州诺曼生物技术有限公司 | Dry and wet sludge mixes the dehydration device that homogenizes |
| CN109912151A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of method of broken wall anaerobism drying and other treatment residual active sludge |
| CN109912139A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A method of processing residual active sludge |
| CN109912149A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of excess sludge anaerobism drying method for treating |
| CN109912174A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of residual active sludge broken wall Deep dehydration treatment method |
| CN109912138A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of residual active sludge desiccation processing method |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109912151A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of method of broken wall anaerobism drying and other treatment residual active sludge |
| CN109912139A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A method of processing residual active sludge |
| CN109912149A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of excess sludge anaerobism drying method for treating |
| CN109912174A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of residual active sludge broken wall Deep dehydration treatment method |
| CN109912138A (en) * | 2017-12-13 | 2019-06-21 | 中国石油化工股份有限公司 | A kind of residual active sludge desiccation processing method |
| CN109912149B (en) * | 2017-12-13 | 2021-08-31 | 中国石油化工股份有限公司 | Anaerobic drying treatment method for excess sludge |
| CN109912151B (en) * | 2017-12-13 | 2021-11-09 | 中国石油化工股份有限公司 | Method for treating residual activated sludge by wall-breaking anaerobic drying |
| CN109912138B (en) * | 2017-12-13 | 2021-12-07 | 中国石油化工股份有限公司 | Drying processing method for residual activated sludge |
| CN109912174B (en) * | 2017-12-13 | 2022-01-04 | 中国石油化工股份有限公司 | Wall-breaking deep dehydration treatment method for residual activated sludge |
| CN109912139B (en) * | 2017-12-13 | 2022-02-08 | 中国石油化工股份有限公司 | Method for treating residual activated sludge |
| CN109231767A (en) * | 2018-10-15 | 2019-01-18 | 杭州诺曼生物技术有限公司 | Dry and wet sludge mixes the dehydration device that homogenizes |
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