CN102183027B - Treatment method of high calorific value excess sludge - Google Patents

Treatment method of high calorific value excess sludge Download PDF

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Publication number
CN102183027B
CN102183027B CN201110057325XA CN201110057325A CN102183027B CN 102183027 B CN102183027 B CN 102183027B CN 201110057325X A CN201110057325X A CN 201110057325XA CN 201110057325 A CN201110057325 A CN 201110057325A CN 102183027 B CN102183027 B CN 102183027B
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China
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sludge
mud
mummification
powder
flue gas
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CN201110057325XA
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Chinese (zh)
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CN102183027A (en
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邢奕
洪晨
段旭琴
何永峰
徐贵林
姜长禄
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北京科技大学
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Abstract

The invention provides a treatment method of high calorific value excess sludge. The method comprises the following steps of: feeding the excess sludge to be treated with moisture content of 80 to 90 percent into a plate-and-frame water filter press for dehydration to obtain a filter-pressing dehydrated sludge cake; feeding the obtained sludge cake into a sludge granulation device; crushing the sludge cake into coarse granules at normal temperature; further drying the sludge granules in a heat energy drying room; feeding the dried sludge granules into sludge powdering equipment for further treatment, wherein the grain diameter of the treated sludge powder is 150 to 300 meshes, and the water ratio is 5 to 15 percent; storing sludge dried powder into a sludge dried powder warehouse, and spraying the sludge powder having small grain diameter and having a calorific value of 2,000 to 4,000 kilocalories into a sludge burning furnace to completely burn with a small amount of fuels or without the fuels, wherein the interior temperature of the burning furnace is 800 to 1,000 DEG C, and secondary pollution is avoided; and then conducting high-temperature fume which is generated by burning into a waste heat drying device, and drying the sludge. By the process, the burning treatment of the sludge can be performed conveniently, the energy consumption of sludge drying is reduced, the excess sludge is treated properly, and the secondary environmental pollution is avoided.

Description

A kind of method of disposal of high heating value excess sludge
Technical field
The present invention relates to excess sludge and handle and the disposal field, particularly have the method for disposal of the excess sludge of higher calorific value.
Background technology
Excess sludge is the solid sediment matter that produces in the sewage disposal process, contains large quantity of moisture, inorganic ash content and organic volatile.Along with Chinese society economy and development of urbanization, the generation of municipal sewage and quantity thereof are in continuous growth.At present seat surplus the municipal sewage plant about 500 of running has been built up in the whole nation, and a year disposal ability is 113.6 hundred million m 3According to relevant prediction, China's municipal sewage amount also had than leap ahead in next two decades, 2010 the end of the year quantity of wastewater effluent will reach 440 * 108 m 3/ d; The year two thousand twenty quantity of wastewater effluent reaches 536 * 108 m 3/ d.The raising of sewage treating efficiency must cause the increase of excess sludge quantity.According to the national environmental protection department statistics, to the end of the year 2010, China's town sewage handling rate will reach 60%, and annual when the time comes national excess sludge generation will reach 3,000 ten thousand t (moisture content 80%).Excess sludge in the sewage disposal is handled and disposal technology also is in the starting stage in China, and what excess sludge stabilized treatment facility was arranged in the existing sewage treatment facility in the whole nation is less than 1/4, and what treatment process and corollary equipment were comparatively perfect is less than 1/10.Investment and operating cost that excess sludge is handled are huge, can account for that entire sewage factory invests and operating cost 25% ~ 65%, the heavy burden that has become the municipal sewage plant and faced.
Excess sludge is the accessory after the sewage disposal, is a kind of extremely complicated heterogeneous body of being made up of organic relic, bacterium thalline, inorganic particle, colloid etc.The excess sludge salt content is higher, can obviously improve soil conductivity, destroy the plant nutrient balance, suppress plant to nutrient absorbing, even root system of plant is caused direct injury, and interionic antagonism can be quickened the leaching loss of available nutrient.Pathogen in the sewage (pathogenic microorganism and parasite) can get in the mud through handling, nearly thousand kinds of the pathogen that detection obtains in the fresh sludge.In sewage disposal process, 70%~90% heavy metal element is transferred in the excess sludge through absorption or deposition.Some heavy metal elements are mainly derived from waste water such as cadmium, the chromium of industrial discharge; Some heavy metals derive from the pipe-line system such as the heavy metals such as copper, zinc of family life.Heavy metal is the key factor that the extensive soil of restriction excess sludge utilizes, because after excess sludge is applied to soil, heavy metal will accumulate in surface layer.The general solubility of heavy metal is very little in addition, and character is stable, difficult to be removed, so its genotoxic potential is easy in crop and the animal and the mankind, accumulate.After on the soil is porous in rainfall larger area soil, using the excess sludge that is rich in N, P etc. in a large number; When the organic matter decomposition rate greater than plant during to the infiltration rate of N, P; Nutrient such as N, P just might lose with current and get into the eutrophication that surface water body causes water body, gets into the underground phreatic pollution that causes.
Along with social economy and fast development of urbanization, China's municipal sewage treatment ability constantly strengthens, and the surplus sludge volume of generation sharply increases.If excess sludge can not get appropriate treatment and disposal, not only will take a large amount of soils, and will cause secondary pollution environment, become big public hazards that influence urban environmental hygiene.How science, appropriate processing excess sludge have become the key issue that urban development must solve.
Summary of the invention
The objective of the invention is to propose a kind of excess sludge method of disposal of high heating value.Reach with lower energy consumption that excess sludge is innoxious, the minimizing target, and can not produce secondary pollution.
The high heating value excess sludge method of disposal that proposes among the present invention is to the excess sludge of mummification dehydration back calorific value greater than 2000 kilocalories, carries out burning disposal after the mummification of this type excess sludge, does not need or only need add a small amount of combustion-supporting auxiliary material and just can keep burning.Capable of using again thermal source that is used as the excess sludge mummification of heat that sludge incineration produces reduced the energy consumption of sludge drying.
Technical scheme of the present invention is: a kind of high heating value excess sludge method of disposal specifically may further comprise the steps:
1. be that the excess sludge of 80%-90% is sent into plate compression water machine with pending moisture content; Under the compaction pressure of 23MPa-45MPa, dewater; The filter-press dehydration sludge cake that obtains, moisture percentage in sewage sludge is reduced to 45%-55%, and the waste water of generation imports wastewater treatment equipment and handles;
2. the mud cake that above-mentioned steps is made is sent into the mud granulizing device, is broken into the coarse granule that particle diameter is about 3-5mm at normal temperatures, and is subsequent use;
3. mud granule further mummification between the heat energy mummification; With the temperature of discharging in the sludge incinerator is that 300-600 ℃ high-temperature flue gas imports the used heat desiccation apparatus; Utilize the entrained great amount of heat energy of high-temperature flue gas that mud granule is carried out mummification; Drying time is 2-10min, and the mud granule moisture content is reduced to 20%-40% after the mummification, and the flue gas of discharge imports flue gas processing device and handles;
4. sending into mud through the mud granule after the mummification makes powder equipment and further handles; Adopt air-flow high velocity impact technology; Make with sludge dewatering that a large amount of natural airs of inspiration are medium in the powder equipment, from mud, dissociate a large amount of interstitial waters, appearance water, impel mud powder internal moisture to ooze out fast; Handling back mud powder directly is 150 orders ~ 300 orders, and moisture content is 5%-15%;
5. sludge dry powder is stored in the sludge dry powder warehouse; Mud powder footpath is little; Calorific value does not need in the sludge incinerator or only needs small amount of fuel for the 2000-4000 kilocalorie sprays into is incendivity, and burning fully, interior temperature 800-1000 ℃ of incinerator; Do not produce secondary pollution, the high-temperature flue gas that burns generation imports the used heat desiccation apparatus again mud is carried out mummification.
Beneficial effect of the present invention is: owing to adopt technique scheme; The high-temperature flue gas of the great amount of heat energy of carrying that technology utilization sludge incineration of the present invention produces and the step that plate compression, mud granulizing, mud are made powder are reduced to very low degree with moisture percentage in sewage sludge; The burning disposal that helps mud; Save the energy consumption of sludge drying simultaneously, the processing that excess sludge is appropriate is avoided environment is caused secondary pollution.
Description of drawings
Fig. 1 is a principle of the invention sketch map.
The specific embodiment
As shown in Figure 1; The excess sludge disposal plant that technical scheme the comprised combination that the present invention proposes, comprising: sheet frame dewaterer, mud granulizing device, used heat desiccation apparatus, mud are made powder device, sludge dry powder warehouse, sludge incinerator, wastewater treatment equipment, incineration flue gas treating apparatus.Technological process comprises:
The excess sludge of the about 80%-90% of moisture content is stored in the mud storage pool; Handle through carrying out filter-press dehydration in the mud conveyer entering filter press; Free moisture in the mud is pushed out; Process the half-driedization sludge cake of moisture content 45%-55%, the waste water of generation imports wastewater treatment equipment and handles.Half-driedization sludge cake gets into the mud granulizing device through the mud cake conveyer, processes the mud granule of particle diameter 3-5mm, and mud granule has bigger specific area with respect to sludge cake, for next step heat energy mummification creates favorable conditions.Mud granule is further mummification between the heat energy mummification; The high-temperature flue gas that discharges in the sludge incinerator is imported the used heat desiccation apparatus; Flue-gas temperature 300-600 ℃ even higher; Utilize the entrained great amount of heat energy of high-temperature flue gas that mud granule is carried out mummification, the mud granule moisture content is reduced to 20%-40% after the mummification, and the flue gas of discharge imports flue gas processing device and handles.Send into mud through the mud granule after the mummification and make powder equipment and handle, moisture percentage in sewage sludge further is reduced to 5%-15%.The sludge dry powder of processing is stored in the sludge dry powder warehouse, finally gets into sludge incinerator and burns, and the high-temperature flue gas that burns generation imports the used heat desiccation apparatus again mud is carried out mummification.
Embodiment 1:
The excess sludge moisture content 86.2% of certain sewage treatment plant is sent in the plate and frame filter press, and Hydraulic Station is the compaction pressure that plate and frame filter press provides 25MPa.Mud granule is trapped within and forms half-driedization sludge cake in the filter chamber, and filtrating is collected through gathering-device and is recycled to sewage disposal system.Resulting half-driedization sludge cake moisture content 50.7%.Half-driedization sludge cake is gone into the mud granulizing device through the mud cake conveyor delivery, the mud granule that the specific area of processing is bigger, mud granule average grain diameter 3.3mm.Mud granule is further mummification between the heat energy mummification, and the flue-gas temperature that is used for mummification is 550 ℃, and the mud granule moisture content reduces to 30.5% after the mummification.Mud granule is sent into mud and is made powder equipment and handle afterwards, and the mud powder moisture content of processing further is reduced to 14.2%.Finally, finally get into sludge incinerator and burn, the high-temperature flue gas that burns generation imports the used heat desiccation apparatus again mud is carried out mummification.The wastewater collection that produces in the whole disposal process is sent into wastewater treatment equipment and is handled, and the flue gas of discharge imports flue gas processing device and handles.
Embodiment 2:
The excess sludge moisture content 84.3% of certain sewage treatment plant is sent in the plate and frame filter press, and Hydraulic Station is the compaction pressure that plate and frame filter press provides 28MPa.Mud granule is trapped within and forms half-driedization sludge cake in the filter chamber, and filtrating is collected through gathering-device and is recycled to sewage disposal system.Resulting half-driedization sludge cake moisture content 56.9%.Half-driedization sludge cake is gone into the mud granulizing device through the mud cake conveyor delivery, the mud granule that the specific area of processing is bigger, mud granule average grain diameter 4.3mm.Mud granule is further mummification between the heat energy mummification, and the flue-gas temperature that is used for mummification is 465 ℃, and the mud granule moisture content reduces to 30.5% after the mummification.Mud granule is sent into mud and is made powder equipment and handle afterwards, and the mud powder moisture content of processing further is reduced to 8.8%.Finally, finally get into sludge incinerator and burn, the high-temperature flue gas that burns generation imports the used heat desiccation apparatus again mud is carried out mummification.The wastewater collection that produces in the whole disposal process is sent into wastewater treatment equipment and is handled, and the flue gas of discharge imports flue gas processing device and handles.
Embodiment 3:
The excess sludge moisture content 80.6% of certain sewage treatment plant is sent in the plate and frame filter press, and Hydraulic Station is the compaction pressure that plate and frame filter press provides 45MPa.Mud granule is trapped within and forms half-driedization sludge cake in the filter chamber, and filtrating is collected through gathering-device and is recycled to sewage disposal system.Resulting half-driedization sludge cake moisture content 45.4%.Half-driedization sludge cake is gone into the mud granulizing device through the mud cake conveyor delivery, the mud granule that the specific area of processing is bigger, mud granule average grain diameter 4.1mm.Mud granule is further mummification between the heat energy mummification, and the flue-gas temperature that is used for mummification is 600 ℃, and the mud granule moisture content reduces to 26.2% after the mummification.Mud granule is sent into mud and is made powder equipment and handle afterwards, and the mud powder moisture content of processing further is reduced to 5.7%.Finally, finally get into sludge incinerator and burn, the high-temperature flue gas that burns generation imports the used heat desiccation apparatus again mud is carried out mummification.The wastewater collection that produces in the whole disposal process is sent into wastewater treatment equipment and is handled, and the flue gas of discharge imports flue gas processing device and handles.

Claims (1)

1. a high heating value excess sludge method of disposal is characterized in that, specifically comprises the following steps:
With pending moisture content is that the excess sludge of 80%-90% is sent into plate compression water machine, under the compaction pressure of 23MPa-45MPa, dewater, and the filter-press dehydration sludge cake that obtains, moisture percentage in sewage sludge is reduced to 45%-55%, and the waste water of generation imports wastewater treatment equipment and handles;
The mud cake that above-mentioned steps makes is sent into the mud granulizing device, be broken into the coarse granule that particle diameter is about 3-5mm at normal temperatures, subsequent use;
Mud granule is further mummification between the heat energy mummification; With the temperature of discharging in the sludge incinerator is that 300-600 ℃ high-temperature flue gas imports the used heat desiccation apparatus; Utilize the entrained great amount of heat energy of high-temperature flue gas that mud granule is carried out mummification; Drying time is 2-10min, and the mud granule moisture content is reduced to 20%-40% after the mummification, and the flue gas of discharge imports flue gas processing device and handles;
Sending into mud through the mud granule after the mummification makes powder equipment and further handles; Adopt air-flow high velocity impact technology; Make with sludge dewatering that a large amount of natural airs of inspiration are medium in the powder equipment, from mud, dissociate a large amount of interstitial waters, appearance water, impel mud powder internal moisture to ooze out fast; Handling back mud powder directly is 150 orders ~ 300 orders, and moisture content is 5%-15%;
Sludge dry powder is stored in the sludge dry powder warehouse; Mud powder footpath is little; Calorific value does not need in the sludge incinerator or only needs small amount of fuel for the 2000-4000 kilocalorie sprays into is incendivity, and burning fully, interior temperature 800-1000 ℃ of incinerator; Do not produce secondary pollution, the high-temperature flue gas that burns generation imports the used heat desiccation apparatus again mud is carried out mummification.
CN201110057325XA 2011-03-10 2011-03-10 Treatment method of high calorific value excess sludge CN102183027B (en)

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Publication number Priority date Publication date Assignee Title
CN102559327B (en) * 2011-12-16 2013-09-25 苏韶华 Sludge synthetic fuel
CN103374418B (en) * 2012-04-27 2017-05-17 任相坤 Entrained-flow bed gasification method of sludge and pulverized coal
CN103693823B (en) * 2012-09-28 2015-08-19 中国石油天然气股份有限公司 The treatment process that a kind of oily sludge is innoxious
CN102927574B (en) * 2012-11-16 2015-03-04 富阳春江污水回用处理有限公司 Continuously-mechanized papermaking sludge incineration processing method
CN102964041B (en) * 2012-12-03 2014-02-12 厦门荣惠盛新材料有限公司 Sludge burning treatment device and burning treatment method using device
CN105800892A (en) * 2016-05-13 2016-07-27 安徽金农惠民生物技术有限公司 Blue-green algae and excess sludge resourceful treatment method
CN106915888B (en) * 2017-04-01 2020-08-07 广东焕杰环保科技有限公司 Sludge treatment system
CN107366913A (en) * 2017-07-07 2017-11-21 南京福昌环保有限公司 A kind of compatibility processing method based on incineration of waste
CN109956642A (en) * 2017-12-23 2019-07-02 安徽睿知信信息科技有限公司 The processing method of activated sludge in a kind of sewage
CN109928597B (en) * 2019-03-28 2021-03-12 北京科技大学 Residual sludge deep drying equipment system and method

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