CN103920378B - A kind of municipal sludge drying tail gas treating apparatus and method - Google Patents
A kind of municipal sludge drying tail gas treating apparatus and method Download PDFInfo
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- CN103920378B CN103920378B CN201410192260.3A CN201410192260A CN103920378B CN 103920378 B CN103920378 B CN 103920378B CN 201410192260 A CN201410192260 A CN 201410192260A CN 103920378 B CN103920378 B CN 103920378B
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Abstract
The invention discloses a kind of municipal sludge drying tail gas treating apparatus and method, comprise drying device, the air outlet of described drying device is connected with cyclone dust collectors, and the tail gas after dedusting is taken out ejectment sky through water scrubber, caustic wash tower, biofilter by air-introduced machine successively; The air outlet of drying device is connected with the air intake vent of cyclone dust collectors, and the air outlet of cyclone dust collectors is communicated with the entrance of water scrubber, the outlet of water scrubber, the entrance of caustic wash tower, the outlet of caustic wash tower, the entrance of biofilter are communicated with successively, and the air outlet of biofilter is connected with air-introduced machine, described caustic wash tower, the bottom of biofilter carry out after-treatment respectively separately sewage disposal system with its top and the waste liquid for producing caustic wash tower, biofilter is directly communicated with.The present invention adopts water in Sewage Plant to replace the external water source of system as lyosoption, and tower bottom waste liquid out returns to absorption tower again after sewage disposal system process, greatly reduces the consumption of water, reduces operating cost.
Description
Technical field
The present invention discloses a kind of municipal sludge drying tail gas processing method, for the process of tail gas after drying sludge.
Background technology
The large quantity of moisture contained in municipal sludge causes large, the easy corruption of its volume, pathogen parasite grows, calorific value is difficult to utilize.Therefore, reach the requirement of " minimizing, stabilisation, innoxious and resource ", removing moisture is crucial.Domestic and international application practice shows, after traditional concentrated and dewatering process process, the moisture content of mud can not reach less than 60%.After municipal sludge heated drying, moisture content can reach less than 15%, can subtract appearance 80%, and calorific value can improve 10 times, and the sludge microbe after heated drying is almost all killed off, and storage that can also be stable, sells as product.The waste odour-gas body of a large amount of high temperature, high humidity, stench, high concentration is defined in drying sludge process.Main matter in these waste odour-gas bodies is ammonia, hydrogen sulfide, methyl mercaptan, ethyl mercaptan, toluene, dimethylbenzene, methyl disulfide etc., wherein ammonia and hydrogen sulfide etc. are compositions soluble in water, and methyl mercaptan, ethyl mercaptan, toluene, dimethylbenzene and methyl disulfide etc. are VOC gas.Directly be discharged in air if foul gas is not treated, meeting heavily polluted area environment and air quality, cause serious harm to human body and ecological environment.
At present, the most common drying tail gas processing method the most ripe is chemical absorption method and bioanalysis, and wherein chemical absorption method is a ripe technology, effective, and small investment is simple to operate.In patent (201010571645.2), disclose the odor treatment method that a kind of sewage sludge mummification produces, this patent adopts washing+acid-base method process foul smell.Adopt the amount of this method water chemical reagent large, the waste liquid produced after absorbing need process, and there is secondary pollution problem, and this just requires to increase sewage-treatment plant, increases the investment cost of equipment; Overall energy consumption is high, operation and maintenance cost is also high, is particularly useful for high concentration foul smell.
Summary of the invention
The object of the invention is, for the self-built sludge drying system of Sewage Plant, to provide the sludge drying tail gas processing method that a kind of energy-saving and water-saving, operating cost are low, for the treatment of the foul smell produced in dewatered sludge process.
For achieving the above object, the present invention adopts following technical scheme:
A kind of municipal sludge drying tail gas treating apparatus, comprise drying device, the air outlet of described drying device is connected with cyclone dust collectors, and the tail gas after dedusting is taken out ejectment sky through water scrubber, caustic wash tower, biofilter by air-introduced machine successively; The air outlet of described drying device is connected with the air intake vent of cyclone dust collectors, and the air outlet of cyclone dust collectors is communicated with the entrance of water scrubber, the outlet of water scrubber, the entrance of caustic wash tower, the outlet of caustic wash tower, the entrance of biofilter are communicated with successively, and the air outlet of biofilter is connected with air-introduced machine, described caustic wash tower, the bottom of biofilter carry out after-treatment respectively separately sewage disposal system with its top and the waste liquid for producing caustic wash tower, biofilter is directly communicated with; The bottom of described water scrubber with bottom its top, caustic wash tower with sewage disposal system process after middle water be communicated with respectively.
Described drying device is revolving drum drier or band drier or paddle-dryer or tray drier or fluid bed dryer.
Described water scrubber is spray column, in Sewage Plant, water is as water source, utilizes the ammonia in water scrubber dominant absorption tail gas, and bottom water scrubber slurry pool, waste liquid is out in alkalescence, a part returns to water scrubber top, and another part enters caustic wash tower for absorbing the sour gas in tail gas.
Described caustic wash tower is spray column; And the slurry pool bottom spray column is communicated with water in Sewage Plant, in Sewage Plant, water is as lyosoption; Bottom caustic wash tower slurry pool, a waste liquid part out returns caustic wash tower, another part enters the anaerobic pond of the sewage disposal system of Sewage Plant, and in after sewage disposal system process, water is re-used as supplementing solvent and enters the alkaline waste liquor after slurry pool and water scrubber and NaOH/Na (ClO)
2spray column top is sent into again after mixing.
Described biofilter is the deodorizing tower that biologic packing material is housed, odorant wherein in mud is adsorbed by the Extracellular polymers of microorganism secretion and is rapidly absorbed in microbial cell, under the catalytic action of various biology enzyme, metabolic pathway is broken down into simple inorganic matter; And a zinc cation liquid bath waste liquid part out returns deodorizing tower bottom deodorizing tower, a part enters the anaerobic pond of the sewage disposal system of Sewage Plant, in after sewage disposal system process, water is re-used as supplementing solvent and enters zinc cation liquid bath bottom deodorizing tower, sends into deodorizing tower top after mixing in zinc cation liquid bath with the medicament of adjustment nutrient environment again.
A kind of municipal sludge drying tail gas treating apparatus and method, can be used for processing the tail gas produced in sludge-drying process, its technological process is:
(1) gas flow process: dried tail gas after cyclone dust removal successively by water scrubber, caustic wash tower and biofilter be recycled blower fan take out draw directly emptying, gas from tower bottom enter absorption tower drench with tower top absorbent in tower reverse contact after discharge from tower top;
(2) mud flow process: discharged by drying device discharging opening after wet mud drying device drying, be delivered to siccative storehouse together with the dry powder of cyclone collection;
(3) water system flow process: in Sewage Plant, water enters water scrubber, caustic wash tower, biofilter as lyosoption respectively through circulating pump, after absorbing conversion odorant, absorbing liquid goes out a part from tower bottom and returns in absorption tower, another part of water scrubber absorbs waste liquid and enters caustic wash tower, another part of caustic wash tower and biofilter absorbs the anaerobic pond that waste liquid then enters the sewage disposal system of Sewage Plant, and in after sewage disposal system process, water is re-used as supplementing solvent and enters absorption tower.
In described step (1), described dried exhaust temperature is 120 ~ 150 DEG C.
In described step (2), described dried mud temperature is 8 ~ 110 DEG C.
In described step (3), described water scrubber absorbing liquid is water in Sewage Plant, is mainly used in eliminating the gas componants soluble in water such as ammonia soluble in water in tail gas and tail gas being removed water for cooling.
In described step (3), the absorbing liquid of described caustic wash tower is water in Sewage Plant, the absorption waste liquid of water scrubber, the mixed liquor of mass concentration to be (1 ~ 10%) NaOH solution and mass concentration be (0.005 ~ 0.2%) additive solution, the pH value of mixed liquor remains on more than 10, the sour gas such as the main removal of hydrogen sulfide of NaOH, additive clorox generally uses together with alkaline absorption solution, be mainly used in eliminating the sulfuration methyl other method being difficult to elimination, during process high concentration foul smell, liquor natrii hypochloritis's concentration (effective chlorine density) is about 0.05 ~ 0.2%, during process low concentration foul smell, use liquor natrii hypochloritis's concentration about 0.005 ~ 0.05%.
In described step (3), described biofilter is mainly used in eliminating washing, the foul gas of low concentration after alkali cleaning.
In described step (3), after described absorption conversion odorant, absorbing liquid returns in absorption tower from tower bottom extraction (50 ~ 70) %, water scrubber remaining (30 ~ 50) % absorbs waste liquid and enters caustic wash tower, caustic wash tower and biofilter remaining (30 ~ 50) % absorb the anaerobic pond that waste liquid then enters the sewage disposal system of Sewage Plant, and the temperature of anaerobic pond reactant liquor is improved (1 ~ 10) DEG C.
The present invention adopts washing, alkali cleaning adds Biochemical method sludge drying tail gas, washing can by ingredient draws soluble in water in tail gas, can also for tail gas be except water for cooling, so not only by ingredient draws soluble in water, decrease the use of the chemical reagent in subsequent processing steps, and avoid sour gas and VOC gas and the tool strong oxidizing property problem too high with the temperature produced during alkaline spray solution generation chemical reaction, strengthen security during work; Water in Sewage Plant is utilized to replace the external water source of system as the solvent of water scrubber, caustic wash tower and biofilter, water scrubber tower bottom waste liquid out enters caustic wash tower, caustic wash tower tower bottom waste liquid out then returns to absorption tower again after sewage disposal system process, the heat of absorbing liquid after absorbing conversion odorant is utilized the temperature of anaerobic pond reactant liquor to be improved, not only save water resource, improve comprehensive resource utilization rate, reduce operating cost, also reduce the load that Sewage Plant provides boiler for oneself.
Biological deodorization utilizes organism adsorption-decomposition function odor causing substance fixing in solid support matter, only needs the medicament expense consuming power cost and a small amount of adjustment nutrient environment that odorant is contacted with microbial to use during operation.Bioanalysis compares with other materilization freatment method, advantage is mainly reflected in: process equipment is simple, administer and maintain conveniently, overall energy consumption is low, operation and maintenance cost is few, the less problem occurring secondary pollution and shift across medium pollution, is especially applicable to low concentration foul smell.These advantages make its research and development very fast, become the important development direction of odor treatment.
The invention has the beneficial effects as follows:
(1) adopt water in Sewage Plant to replace the external water source of system as lyosoption, and tower bottom waste liquid out return to absorption tower again after sewage disposal system process, greatly reduces the consumption of water, reduces operating cost;
(2) after utilizing absorption conversion odorant, the temperature of anaerobic pond reactant liquor improves by the heat of absorbing liquid, and reduce the load that Sewage Plant provides boiler for oneself, improve comprehensive resource utilization rate, whole system energy-saving effect is obvious.
(3) adopt WATER-WASHING METHOD pretreatment drying tail gas, not only except security when water for cooling strengthens work, also reduce the use of the chemical reagent in subsequent processing steps; Water scrubber tower bottom waste liquid out enters caustic wash tower, decreases the use amount of alkali lye, reduces operating cost.
(4) foul gas of low concentration after employing biofilter process washing, alkali cleaning, overcome the shortcoming of acid-base method process low concentration foul smell and Biochemical method high concentration foul smell poor effect, deodorizing effect significantly improves, and the scope of application increases greatly.
Accompanying drawing explanation
Fig. 1 is the process chart of the specific embodiment of the invention.
Wherein, 1. drying device, 2. cyclone dust collectors, 3. water scrubber, 4. caustic wash tower, 5. air-introduced machine, 6. biofilter.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
A kind of municipal sludge drying tail gas treating apparatus, its device comprises drying device 1, cyclone dust collectors 2, water scrubber 3, caustic wash tower 4, biofilter 6 and air-introduced machine 5, the air outlet of drying device 1 is connected with the air intake vent of cyclone dust collectors 2, and the air outlet of cyclone dust collectors 2 is communicated with the entrance of the water scrubber absorbing ammonia in tail gas, the outlet of water scrubber 3, the entrance of caustic wash tower 4, the outlet of caustic wash tower 4, the entrance of biofilter 6 is communicated with successively, and the air outlet of biofilter 6 is connected with air-introduced machine 5, caustic wash tower 4, the bottom of biofilter 6 respectively separately and its top and for caustic wash tower 4, the sewage disposal system that the waste liquid that biofilter 6 produces carries out after-treatment is directly communicated with, the side, bottom of described water scrubber 3 is communicated with its top, and opposite side is communicated with the middle water after the sewage disposal system process bottom caustic wash tower 4.
Drying device 1 is revolving drum drier or band drier or paddle-dryer or tray drier or fluid bed dryer.
Water scrubber 3 and caustic wash tower 4 are spray column, and the slurry pool bottom spray column is communicated with water in Sewage Plant, in Sewage Plant, water is as lyosoption, utilize the ammonia in water scrubber dominant absorption tail gas, alkaline waste liquor after water scrubber absorbs the sour gas in tail gas, bottom water scrubber slurry pool, a waste liquid part out returns to water scrubber top, another part enters caustic wash tower, bottom caustic wash tower slurry pool, a waste liquid part out returns caustic wash tower, another part enters the anaerobic pond of the sewage disposal system of Sewage Plant, in after sewage disposal system process, water is re-used as supplementing solvent and enters the alkaline waste liquor after slurry pool and water scrubber and NaOH/Na (ClO)
2spray column top is sent into again after mixing.
Biofilter 6 is for being equipped with the deodorizing tower of biologic packing material, odorant wherein in mud is adsorbed by the Extracellular polymers of microorganism secretion and is rapidly absorbed in microbial cell, under the catalytic action of various biology enzyme, metabolic pathway is broken down into simple inorganic matter; And a zinc cation liquid bath waste liquid part out returns deodorizing tower bottom deodorizing tower, a part enters the anaerobic pond of the sewage disposal system of Sewage Plant, in after sewage disposal system process, water is re-used as supplementing solvent and enters zinc cation liquid bath bottom deodorizing tower, sends into deodorizing tower top after mixing in zinc cation liquid bath with the medicament of adjustment nutrient environment again.
In Fig. 1, a kind of municipal sludge drying tail gas processing method, drying device 1 offgas duct is connected with cyclone dust collectors 2, and the tail gas after dedusting is taken out ejectment sky through water scrubber 3, caustic wash tower 4, biofilter 6 by air-introduced machine 5 successively; Siccative storehouse is transported back together with the meal that dried mud drying device 1 discharging opening and cyclone dust collectors 2 are collected; A waste liquid part for water scrubber 3 returns in absorption tower through circulating pump, and a part enters caustic wash tower 4; A waste liquid part for caustic wash tower 4 and biofilter 6 returns in absorption tower through circulating pump, and a part enters the anaerobic pond of the sewage disposal system of Sewage Plant, and in after sewage disposal system process, water is re-used as supplementing solvent and enters spray column.
Concrete implementation step is as follows:
(1) mud of moisture 70% ~ 90% transports siccative storehouse back together with the meal collected with cyclone dust collectors 2 after drying device 1 drying;
(2) dried tail gas is taken out ejectment sky through water scrubber 3, caustic wash tower 4, biofilter 6 by air-introduced machine 5 successively after cyclone dust collectors 2 dedusting;
(3) waste liquid (50 ~ 70) % of water scrubber 3 returns in absorption tower through circulating pump, and residue (30 ~ 50) % enters caustic wash tower 4; Waste liquid (50 ~ 70) % of caustic wash tower 4 and biofilter 6 returns in absorption tower through circulating pump, residue (30 ~ 50) % enters the anaerobic pond of the sewage disposal system of Sewage Plant, and in after sewage disposal system process, water is re-used as supplementing solvent and enters absorption tower.
Claims (4)
1. the processing method of a municipal sludge drying tail gas treating apparatus, described device comprises drying device, the air outlet of described drying device is connected with cyclone dust collectors, and the tail gas after dedusting is taken out ejectment sky through water scrubber, caustic wash tower, biofilter by air-introduced machine successively; The air outlet of described drying device is connected with the air intake vent of cyclone dust collectors, and the air outlet of cyclone dust collectors is communicated with the entrance of water scrubber, the outlet of water scrubber, the entrance of caustic wash tower, the outlet of caustic wash tower, the entrance of biofilter are communicated with successively, and the air outlet of biofilter is connected with air-introduced machine, described caustic wash tower, the bottom of biofilter carry out after-treatment respectively separately sewage disposal system with its top and the waste liquid for producing caustic wash tower, biofilter is directly communicated with; The bottom of described water scrubber with bottom its top, caustic wash tower with sewage disposal system process after middle water be communicated with respectively; It is characterized in that, technological process is as follows: (1) gas flow process: dried tail gas after cyclone dust removal successively by water scrubber, caustic wash tower and biofilter be recycled blower fan take out draw directly emptying, gas from tower bottom enter absorption tower drench with tower top absorbent in tower reverse contact after discharge from tower top; (2) mud flow process: discharged by drying device discharging opening after wet mud drying device drying, be delivered to siccative storehouse together with the dry powder of cyclone collection; (3) water system flow process: in Sewage Plant, water enters water scrubber, caustic wash tower, biofilter as lyosoption respectively through circulating pump, after absorbing conversion odorant, absorbing liquid goes out a part from tower bottom and returns in absorption tower, another part of water scrubber absorbs waste liquid and enters caustic wash tower, another part of caustic wash tower and biofilter absorbs the anaerobic pond that waste liquid then enters the sewage disposal system of Sewage Plant, and in after sewage disposal system process, water is re-used as supplementing solvent and enters absorption tower.
2. the method for claim 1, is characterized in that: in described step (1), and described dried exhaust temperature is 120 ~ 150 DEG C; In described step (2), described dried mud temperature is 8 ~ 110 DEG C.
3. the method for claim 1, is characterized in that: in described step (3), and described water scrubber absorbing liquid is water in Sewage Plant, for eliminating the gas componants soluble in water such as ammonia soluble in water in tail gas and tail gas being removed water for cooling.
4. the method for claim 1, it is characterized in that: in described step (3), the absorbing liquid of described caustic wash tower is absorption waste liquid, the NaOH solution/clorox mixed liquor of water, water scrubber in Sewage Plant, the pH value of mixed liquor remains on more than 10, the sour gas such as the main removal of hydrogen sulfide of NaOH, additive clorox generally uses together with alkaline absorption solution, is mainly used in eliminating the sulfuration methyl other method being difficult to elimination.
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| CN111013354B (en) * | 2019-12-27 | 2022-07-05 | 湖南军信环保股份有限公司 | Sludge drying tail gas treatment system and method |
| CN111450671A (en) * | 2020-05-12 | 2020-07-28 | 大唐环境产业集团股份有限公司 | Sludge drying tail gas treatment system and method |
| CN113368671A (en) * | 2021-06-29 | 2021-09-10 | 河南绿蓝环保工程有限公司 | Novel process for treating VOCS (volatile organic Compounds) in carbon-neutralized sewage |
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