CN104098239A - Sewage sludge treatment method - Google Patents
Sewage sludge treatment method Download PDFInfo
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- CN104098239A CN104098239A CN201410381206.3A CN201410381206A CN104098239A CN 104098239 A CN104098239 A CN 104098239A CN 201410381206 A CN201410381206 A CN 201410381206A CN 104098239 A CN104098239 A CN 104098239A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000010801 sewage sludge Substances 0.000 title claims abstract description 29
- 238000007710 freezing Methods 0.000 claims abstract description 71
- 230000008014 freezing Effects 0.000 claims abstract description 71
- 239000010802 sludge Substances 0.000 claims abstract description 57
- 238000001035 drying Methods 0.000 claims abstract description 36
- 238000003825 pressing Methods 0.000 claims abstract description 24
- 230000018044 dehydration Effects 0.000 claims abstract description 7
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 7
- 230000007246 mechanism Effects 0.000 claims description 50
- 239000006200 vaporizer Substances 0.000 claims description 41
- 238000001914 filtration Methods 0.000 claims description 24
- 230000007306 turnover Effects 0.000 claims description 20
- 239000008187 granular material Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 14
- 238000010257 thawing Methods 0.000 claims description 10
- 238000013467 fragmentation Methods 0.000 claims description 9
- 238000006062 fragmentation reaction Methods 0.000 claims description 9
- 239000012530 fluid Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 13
- 239000002245 particle Substances 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000004108 freeze drying Methods 0.000 abstract 2
- 239000013043 chemical agent Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 239000007789 gas Substances 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000005189 flocculation Methods 0.000 description 7
- 230000016615 flocculation Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000002918 waste heat Substances 0.000 description 6
- 239000000084 colloidal system Substances 0.000 description 5
- 239000010865 sewage Substances 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000008030 elimination Effects 0.000 description 3
- 238000003379 elimination reaction Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 241000406668 Loxodonta cyclotis Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 235000013527 bean curd Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000031018 biological processes and functions Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000007791 dehumidification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000502 dialysis Methods 0.000 description 1
- 150000002013 dioxins Chemical class 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- 238000009472 formulation Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
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Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a sewage sludge treatment method. The sewage sludge treatment method comprises a first step of utilizing a freeze drying energy circulating system to continuously freeze sludge in a sludge freezing container, unfreezing the sludge after continuous freezing, and performing freezing and unfreezing repeatedly; a second step of dehydrating the sludge having undergone freezing and unfreezing treatment in a filter pressing device, wherein dehydration comprises a filter pressing stage and a squeezing dewatering stage, and enabling the sludge to undergo filter pressing to be chunk mud-cake-shaped sludge low in moisture content; a third step of crushing the chunk mud-cake-shaped sludge in a crushing device and forming small sludge particles; a fourth step of conveying the crushed sludge particles to enter a sludge drying device to be dried, enabling the freeze drying energy circulating system to release heat through a condenser, transferring heat to air, and enabling the hot air to enter the sludge drying device to dry the sludge particles. According to the sewage sludge treatment method, chemical agents do not need to be added to sludge, the sludge treatment amount is not increased in the treatment process, and recycling of working medium energy greatly improves sludge freezing efficiency and heat utilization rate.
Description
Technical field
The present invention relates to field of sludge treatment, specifically a kind of sewage sludge treatment method.
Background technology
In sewage treatment process, produce a large amount of mud, its quantity accounts for the 0.3%-0.5% that processes the water yield, processing investment and the running cost of mud are very huge, the 20%-50% that the expense of processing for sewage sludge generally accounts for sewage work's working cost, has brought white elephant to sewage disposal.Sludge dewatering is very important link during sludge treatment is disposed, all significant to follow-up dry, the burning of mud, recycling, landfill etc.The key of sludge dewatering is to improve the dewatering of mud, and current traditional treatment process is first to nurse one's health by adding flocculation agent, and then pressure filter carries out mechanical dehydration, and landfill, fermentation composting etc. are carried out in the mud outward transport that forms water ratio 60% left and right.Adding flocculation agent pretreatment process is the throwing out by flocculation agent, reduced the avidity of mud and water, changed the existence form of moisture in mud, in and sewage in contrary electric charge, compression double electric layer, plays adsorption bridging to de-steady flocculated particle, makes it form fast large flco, thereby make elimination of colloid stability cohesion, realize solid-liquid separation.Flocculant dosage is to account for the per-cent of sewage sludge solid dry weight, and different flocculant dosages can be distinguished to some extent.Although can significantly improve the dewatering of mud by adding the method for flocculation agent, due to a large amount of flocculation agent of needs, not only increase the cost that sewage sludge is processed, and a large amount of flocculation agents can be increased in the mud after dehydration, strengthen the treatment capacity of mud.The amount of heat that other pretreatment processs need to consume as supersound process, and need to set up ultrasonic processing apparatus; Adopt biological process and thermodynamic method need to consume biotechnological formulation and heat.
Adopt freezing method to carry out pre-treatment in early stage to mud, mud is through destroying the bonding force of mud and water and destroy the structure (be similar to freezing after built-in bean curd) of colloid after repeatedly freezing, make elimination of colloid stability cohesion and membranolysis, make out to form the easily interstitial water to remove of mechanical means with the cell interior water dialysis that mechanical means is difficult to remove, the rapid sedimentation of mud granule, dewatering speed is front higher tens times than freezing, adopt freezing method not add medicament, can save reagent cost, and can additionally not increase the sewage sludge treatment capacity in later stage, again in conjunction with mud method for subsequent processing, completing sludge deep minimizing processes.
Yet, the freezing main dependence physical environment of prior art to mud, mud being placed in to outdoor dependence physical environment under arctic weather is cooled to-10 ℃ of left and right and carries out freezing and thaw, but low, the consuming time length of efficiency, if and in southern area or cannot operate in situation non-winter, natural condition require comparatively harsh.In addition, prior art is used external force carry out freezing and thaw and need to freeze and heat dual energy mud mud, and cost is very high, therefore be difficult to apply.
Summary of the invention
In view of this, the present invention is directed to the problem that increase flocculation agent can increase sewage sludge treatment capacity and freezing efficiency is low, cost is high that above-mentioned prior art exists, provide a kind for the treatment of processes can not increase sewage sludge treatment capacity, the sewage sludge treatment method that freezing efficiency is high and capacity usage ratio is high.
Technical solution of the present invention is, a kind of sewage sludge treatment method of following structure is provided, based on sludge treatment equipment, described sludge treatment equipment comprises mud freezing container, sludge drying mechanism and lyophilize energy cycle system, described lyophilize energy cycle system comprises compressor, the first vaporizer, condenser and be arranged at the second vaporizer in mud freezing container, the outlet side of compressor is connected with condenser, condenser is connected with the first vaporizer through throttling element, the first vaporizer is connected with the inlet end of compressor through the second vaporizer, described condenser is connected by gas pipeline and sludge drying mechanism bottom, the first vaporizer with by gas pipeline, be connected with sludge drying mechanism top, the condenser described in the while is connected by gas pipeline with the first vaporizer,
Described sewage sludge treatment method comprises the following steps:
1) by lyophilize energy cycle system, the mud in mud freezing container is continued freezingly, continue freezing rear mud is thawed, repeated multiple times freeze-thaw like this;
2) in filter-pressing device, the mud after freeze-thaw processing finishes is dewatered, minute press filtration stage and press dewatering stage, make mud by press filtration, be become the bulk mud cake shape mud of low-water-content;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule;
4) mud granule after fragmentation is delivered in sludge drying mechanism and is dried, by lyophilize energy cycle system, by condenser heat release, transfer heat to air, warm air enters sludge drying mechanism mud granule is dried;
Adopt above structure, the present invention compared with prior art, have the following advantages: adopt the present invention, utilized lyophilize energy cycle system, realized the freezing of mud in mud freezing container and being dried the mud in sludge drying mechanism simultaneously, working medium is under compressor effect, output High Temperature High Pressure gaseous working medium, through condenser, heat in working medium is by absorption of air, transfer heat to air, air themperature raises, Temperature of Working reduces, warm air passes in sludge drying mechanism material is dried, working medium is condensed and becomes high-pressure liquid, high-pressure liquid working medium becomes low-pressure liquid working medium after throttling element step-down, low-pressure liquid working medium enters into the first vaporizer, absorb the air heat (from material top air out) in the first vaporizer, to air cooling-down, after saturated air cooling, the moisture that it can hold reduces, unnecessary hydrogenesis becomes liquid water to drain by the water accumulating disc of the first vaporizer, after working medium heat absorption, from low-pressure liquid, become low pressure gaseous state (insufficient if working medium absorbs the heat of air, the working medium that can only guarantee operative liquid flashes to gaseous working medium, and the liquid refrigerant of remainder and gaseous working medium form two-phase working substance) enter into the second vaporizer, working medium absorbs the heat of mud in the second vaporizer, mud is cooled to needed freezing temp-10 ℃~-15 ℃ (this temperature range is better, but be not limited to this numerical range), now liquid working substance is gasificated into gaseous working medium, gaseous working medium enters in compressor.Mud is through freeze-thaw (thaw and can naturally thaw) repeatedly in mud freezing container, destroyed the structure of mud, mud through thawing enters filter-pressing device, filter-pressing device is pressed into bulk pie mud by mud, send into again shredder assembly and carry out fragmentation formation mud granule, mud granule is dried in sludge drying mechanism, has realized the stage of mud and has processed.Due to without adding chemicals in mud, therefore treating processes can not increase sewage sludge treatment capacity, the recycle of working medium energy has improved the freezing efficiency of mud greatly; Only need by a small amount of compressor energy of cost, working medium can be by the heat " carrying " that is several times as much as energy consumption of compressor in freezing container in loft drier, realize the freezing and drying sludge of mud simultaneously, solved the cold source of freezing needs, solved again the origin of heat of dry needs, make cold and heat reach an extraordinary balance, greatly improved the applicable efficiency of heat, energy-saving effect is obvious.
As preferably, described mud freezing container is a plurality of, the second vaporizer is corresponding one by one with mud freezing container, the two ends of the second vaporizer in a plurality of mud freezing containers are connected with compressor with the first vaporizer by working medium reversing valve respectively, the bottom of mud freezing container is provided with filtration, and the bottom of a plurality of mud freezing containers is communicated with filter-pressing device by liquid reversing valve and through fluid pipeline.Like this, the mud in a mud freezing container carry out freezing in, the mud of part mud freezing container carries out nature and thaws, what thawed is directly delivered in filter-pressing device, thereby improves processing efficiency, can produce continuously.
As preferably, described sludge drying mechanism comprises loft drier and mud panel turnover mechanism, described mud panel turnover mechanism, and level is arranged on the vertical height of difference in loft drier, described mud panel turnover mechanism is staggered, and a mud panel turnover mechanism of bottommost layer stretches out outside loft drier.Like this, mud enters sludge drying mechanism after fragmentation, first fall into the mud panel turnover mechanism the superiors, transmission along with mud panel turnover mechanism, mud drops on the mud panel turnover mechanism of lower one deck, the mud panel turnover mechanism of lower one deck commutates and drives to other one end, and so forth, can realize warm air and contact up and down with mud, omnibearing dry, improve drying effect, when dropping down onto a mud panel turnover mechanism of bottommost layer, because it stretches out outside loft drier, mud is sent to outside loft drier by it, enters next step operation and processes.
As preferably, described filter-pressing device is plate-and-frame filter press, plate-and-frame filter press comprises a plurality of sheet frames, below sheet frame, be provided with drawing-plate mechanism, described drawing-plate mechanism comprises polylith guiding piece and slide plate, is provided with articulated linkage, and is equipped with roller between adjacent two guiding pieces under every guiding piece, described polylith guiding piece is placed on slide plate, and can be rolled and be connected with slide plate by roller.Like this, by polylith drawing-plate mechanism, carry out pull, can realize the pull of a plurality of sheet frames, solved the current problem that can only simultaneously draw a sheet frame, shorten the arm-tie time, improve the efficiency of press filtering of filter-pressing device.
As preferably, in plate-and-frame filter press, carry out mechanical dehydration, first carry out the press filtration stage, press filtration pressure is 1.0-1.2Mpa, and time of filter pressing is 1.5-2 hour, through the moisture percentage in sewage sludge 65%-70% in press filtration stage, enter into again the press dewatering stage, squeeze pressure is 1.5Mpa, and the squeezing time is 1 hour, the about 60%-65% of moisture percentage in sewage sludge after processing.
Accompanying drawing explanation
Fig. 1 is sludge treatment equipment schematic diagram used in the present invention;
Fig. 2 is the structural representation of drawing-plate mechanism.
Fig. 3 is the FB(flow block) of the present invention's method.
Guiding piece as shown in the figure, 1, filter-pressing device, 1.1, sheet frame, 1.2,, 1.3, slide plate, 1.4, articulated linkage, 1.5, roller, 2, shredder assembly, 3, sludge drying mechanism, 3.1, loft drier, 3.2, mud panel turnover mechanism, 4, mud freezing container, 5, compressor, the 6, first vaporizer, 7, condenser, the 8, second vaporizer, 9, throttling element, 10, gas pipeline, 11, working medium reversing valve, 12, filtration, 13, liquid reversing valve, 14, fluid pipeline, 15, rotor pump.
Embodiment
Below in conjunction with the drawings and specific embodiments, the invention will be further described.
As shown in 1 and 2 figure, a kind of sludge treatment equipment involved in the present invention, comprise filter-pressing device 1, shredder assembly 2 and sludge drying mechanism 3,1 pair of mud of filter-pressing device carries out having by shredder assembly 2 and carrying out break process after press filtration processing, enters sludge drying mechanism 3 and carry out drying treatment after sludge crushing;
Described sludge treatment equipment also comprises mud freezing container 4 and lyophilize energy cycle system, described lyophilize energy cycle system comprises compressor 5, the first vaporizer 6, condenser 7 and is arranged at the second vaporizer 8 in mud freezing container 4, the outlet side of compressor 5 is connected with condenser 6, condenser 7 is connected with the first vaporizer 6 through throttling element 9, and the first vaporizer 6 is connected with the inlet end of compressor 5 through the second vaporizer 8; Described condenser 7 is connected with sludge drying mechanism 3 bottoms by gas pipeline 10, the first vaporizer 6 with by gas pipeline 10, be connected with sludge drying mechanism 3 tops, simultaneously described condenser 7 is connected by gas pipeline 10 with the first vaporizer 6.
Described mud freezing container 4 is a plurality of, the second vaporizer 8 is corresponding one by one with mud freezing container 4, the two ends of the second vaporizer 8 in a plurality of mud freezing containers 4 are connected with compressor 5 with the first vaporizer 6 by working medium reversing valve 11 respectively, the bottom of mud freezing container 4 is provided with filtration 12, and the bottom of a plurality of mud freezing containers 4 is passed through liquid reversing valve 13 and is communicated with filter-pressing device 1 through fluid pipeline 14; Mud after thawing pumps into filter-pressing device 1 by rotor pump 15 from mud freezing container 4.
Described sludge drying mechanism 3 comprises loft drier 3.1 and mud panel turnover mechanism 3.2, described mud panel turnover mechanism, level is arranged on the vertical height of difference in loft drier 3.1, described mud plate turnover 3.2 structures are staggered, and a mud panel turnover mechanism 3.2 of bottommost layer stretches out outside loft drier 3.1.
Described filter-pressing device 1 is plate-and-frame filter press, plate-and-frame filter press comprises a plurality of sheet frames 1.1, below sheet frame 1.1, be provided with drawing-plate mechanism, described drawing-plate mechanism comprises polylith guiding piece 1.2 and slide plate 1.3, between adjacent two guiding pieces 1.2, be provided with articulated linkage 1.4, and being equipped with roller 1.5 1.2 times at every guiding piece, described polylith guiding piece 1.2 is placed on slide plate 1.3, and is slidably connected with slide plate 1.3 by roller 1.5.
Described sewage sludge treatment method comprises the following steps:
1) by lyophilize energy cycle system, the mud in mud freezing container is continued freezingly, continue freezing rear mud is thawed, repeated multiple times freeze-thaw like this; In freezing temp-10 ℃~-15 ℃, freezing time, carry out repeatedly under 72 hours freezing; Between 20-40 ℃, thaw (can adopt normal temperature unfreezing), thawing time is about 6 hours;
2) in filter-pressing device, the mud after freeze-thaw processing finishes is dewatered, minute press filtration stage and press dewatering stage, make mud by press filtration, be become the bulk mud cake shape mud of low-water-content; In plate-and-frame filter press, carry out mechanical dehydration, first carry out the press filtration stage, press filtration pressure is 1.0-1.2Mpa, time of filter pressing is 1.5-2 hour, through the moisture percentage in sewage sludge 65%-70% in press filtration stage, then enter into the press dewatering stage, squeeze pressure is 1.5Mpa, the squeezing time is 1 hour, the about 60%-65% of moisture percentage in sewage sludge after processing;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule; Mud granule size is generally in 20mm left and right;
4) mud granule after fragmentation is delivered in sludge drying mechanism and is dried, by lyophilize energy cycle system, by condenser heat release, transfer heat to air, warm air enters sludge drying mechanism mud granule is dried; Sludge drying mechanism is Multi-layer panel-turnover, and be 2 hours time of drying, drying temperature 50-60 ℃, and after super-dry, the water ratio of mud is 10%-30%, now the first vaporizer provides cold to mud freezing container;
Above-mentioned steps is only the interim step of sludge treatment, and mud also can carry out burning disposal after drying, and carries out waste heat recovery, and waste heat is used for to thawing of the freezing mud of mud freezing container.It should be noted that Fig. 3 has comprised treatment step and the method more completing, perfect energy cycle system (the thawing for mud by the waste heat of burning), carries out burning disposal and recycles burning the waste heat occurring dried mud.
Specific works principle is as follows:
Mud enters into mud freezing container, first under the second vaporizer effect, refrigeration working medium enter into the second vaporizer in, working medium is absorbed heat to mud, make the freezing temp of mud reach regulation stable, sewage under-10 ℃~-15 ℃, freezing time 72 hours through repeatedly freezing, destroy the bonding force of mud and water and the structure of destruction colloid, make elimination of colloid stability cohesion and membranolysis, the rapid sedimentation of mud granule, dewatering significantly improves, and dewatering speed is front higher tens times than freezing, freezing end.Now, working medium reversing valve flows to and to commutate working medium, and working medium flow-reversal, in another mud freezing container, has now been passed into the air with certain temperature in freezing mud freezing container and thawed, air themperature is between 20-40 ℃, and thawing time is 6 hours.
After thawing, mud passes through fluid pipeline, enter rotor pump, in adding of rotor pump, depress and enter board and frame machine (plate-and-frame filter press) and start press filtration and carry out mechanical dehydration, after press filtration after a while, pull open sheet frame, the mud of mud cake shape drops in device for transporting objects, through device for transporting objects, be transported to crusher, crusher carries out fragmentation to mud cake, form little mud granule, mud granule size remains on 20mm left and right, become short grained mud to improve the specific surface area of mud, be beneficial to the contact area that increases mud and high temperature air in dry, improve drying rate and effect.
Little mud granule enters into the upper strata turnover panel in drying machine, drops from level to level from top to down, and in the process dropping, constantly upset of mud, all fully contacts each surface with air.Dry air contacts with mud from bottom to top, absorption of air the moisture of mud become the wet air that humidity is very high and drop to below dew point after the first vaporizer, separate out moisture, the moisture of separating out is discharged through water accumulating disc, air continues to be heated after condenser, enters in loft drier mud is dried.Mud leaves loft drier after being heated and being dried after basecoat turnover panel.
For lignin-sludge better, after above interim processing, mud is transported to incinerator by device for transporting objects after leaving loft drier, adjusting enters a wind of combustion chamber, under refiner effect, make it in fluidized bed combustion state, because the medium in fluidized-bed is in suspended state, gas-solid can fully mix contact, in whole stove, the temperature of burning zone is comparatively even, and the approximately 850 ℃ of discharges of waste gas that produce after burning enter into waste heat boiler.Meanwhile, the thermal oil in waste heat boiler is heated to 250 ℃ by 220 ℃, and the thermal oil after being heated heats air by the second interchanger, and the air after heating enters into dehumidification system and thawing apparatus to drying sludge and the heat supply of thawing.Gas-cleaning installation is comprised of removing with particle collection two parts of sour gas, gas sweetening can adopt semidrying, in flue gas, spray into certain calcium oxide, make it to react with the acidic substance in flue gas, and by spraying plant, control moisture and reach spray-dired reaction process.Depickling reactant is essentially solid state, there will not be discharge of wastewater.In flue gas, particle collection can be realized in conjunction with cyclonic separator or cloth bag by filtering net, sprays into a certain amount of activated carbon grain powder before, the objectionable impuritiess such as absorption heavy metal in flue gas and Dioxins.Through purified gas, can discharge atmosphere, environmental pollution is few.
Below only just preferred embodiment of the present invention is described, but can not be interpreted as it is limitations on claims.The present invention is not only confined to above embodiment, and its concrete structure allows to change.In a word, all various variations of doing in the protection domain of independent claim of the present invention are all in protection scope of the present invention.
Claims (5)
1. a sewage sludge treatment method, based on sludge treatment equipment, described sludge treatment equipment comprises mud freezing container (4), sludge drying mechanism (3) and lyophilize energy cycle system, described lyophilize energy cycle system comprises compressor (5), the first vaporizer (6), condenser (7) and be arranged at the second vaporizer (8) in mud freezing container (4), the outlet side of compressor (5) is connected with condenser (7), condenser (7) is connected with the first vaporizer (6) through throttling element (9), the first vaporizer (6) is connected with the inlet end of compressor (5) through the second vaporizer (8), described condenser (7) is connected with sludge drying mechanism (3) bottom by gas pipeline (10), the first vaporizer (6) is connected with sludge drying mechanism (3) top by gas pipeline (10), and described condenser (7) is connected by gas pipeline (10) with the first vaporizer (6) simultaneously,
Described sewage sludge treatment method comprises the following steps:
1) by lyophilize energy cycle system, the mud in mud freezing container is continued freezingly, continue freezing rear mud is thawed, repeated multiple times freeze-thaw like this;
2) in filter-pressing device, the mud after freeze-thaw processing finishes is dewatered, minute press filtration stage and press dewatering stage, make mud by press filtration, be become the bulk mud cake shape mud of low-water-content;
3) bulk mud cake shape mud carries out fragmentation in shredder assembly, forms little mud granule;
4) mud granule after fragmentation is delivered in sludge drying mechanism and is dried, by lyophilize energy cycle system, by condenser heat release, transfer heat to air, warm air enters sludge drying mechanism mud granule is dried.
2. sewage sludge treatment method according to claim 1, it is characterized in that: described mud freezing container (4) is for a plurality of, the second vaporizer (8) is corresponding one by one with mud freezing container (4), the two ends of the second vaporizer (8) in a plurality of mud freezing containers (4) are connected with compressor (5) with the first vaporizer (6) by working medium reversing valve (11) respectively, the bottom of mud freezing container (4) is provided with filtration (12), the bottom of a plurality of mud freezing containers (4) is passed through liquid reversing valve (13) and is communicated with filter-pressing device (1) through fluid pipeline (14), mud after thawing pumps into filter-pressing device (1) by rotor pump (15) from mud freezing container (4).
3. sewage sludge treatment method according to claim 1 and 2, it is characterized in that: described sludge drying mechanism (3) comprises loft drier (3.1) and mud panel turnover mechanism (3.2), described mud panel turnover mechanism, level is arranged on the vertical height of difference in loft drier (3.1), described mud panel turnover mechanism (3.2) is staggered, and a mud panel turnover mechanism (3.2) of bottommost layer stretches out outside loft drier (3.1).
4. sewage sludge treatment method according to claim 1 and 2, it is characterized in that: described filter-pressing device (1) is plate-and-frame filter press, plate-and-frame filter press comprises a plurality of sheet frames (1.1), in sheet frame (1.1) below, be provided with drawing-plate mechanism, described drawing-plate mechanism comprises polylith guiding piece (1.2) and slide plate (1.3), between adjacent two guiding pieces (1.2), be provided with articulated linkage (1.4), and under every guiding piece (1.2), be equipped with roller (1.5), described polylith guiding piece (1.2) is placed on slide plate (1.3), and can roll and be connected with slide plate (1.3) by roller (1.5).
5. sewage sludge treatment method according to claim 4, it is characterized in that: in plate-and-frame filter press, carry out mechanical dehydration, first carry out the press filtration stage, press filtration pressure is 1.0-1.2Mpa, and time of filter pressing is 1.5-2 hour, through the moisture percentage in sewage sludge 65%-70% in press filtration stage, enter into again the press dewatering stage, squeeze pressure is 1.5Mpa, and the squeezing time is 1 hour, and after processing, moisture percentage in sewage sludge is 60%-65%.
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105060679A (en) * | 2015-08-03 | 2015-11-18 | 轻工业环境保护研究所 | Sludge thawing and conditioning system |
CN105712607A (en) * | 2016-04-28 | 2016-06-29 | 湖南科技大学 | Spraying granulation refrigeration vacuum drying device and method for sludge |
CN110183087A (en) * | 2019-05-31 | 2019-08-30 | 武汉美丽东方污泥治理科技有限公司 | A kind of method of sludge Frozen-thawed cycled conditioning and deep dehydration |
CN112028434A (en) * | 2020-08-17 | 2020-12-04 | 中电建水环境科技有限公司 | Plate-frame type sludge freeze-thawing deep dehydration method |
CN112159075A (en) * | 2020-09-27 | 2021-01-01 | 苏州市相城环保技术有限公司 | Sludge freeze dehydration device and sludge dehydration method |
CN112794617A (en) * | 2021-01-06 | 2021-05-14 | 陈傲然 | Intelligent drying equipment with motor input end penetrating through box body |
CN115057606A (en) * | 2022-06-20 | 2022-09-16 | 刘艳菊 | Sludge dewatering method |
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CN102758090A (en) * | 2012-06-29 | 2012-10-31 | 中国瑞林工程技术有限公司 | Treatment method for electroplating sludge |
CN102815848A (en) * | 2012-09-13 | 2012-12-12 | 江苏江达生态科技有限公司 | Surplus sludge high-efficiency drying technique |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105060679A (en) * | 2015-08-03 | 2015-11-18 | 轻工业环境保护研究所 | Sludge thawing and conditioning system |
CN105712607A (en) * | 2016-04-28 | 2016-06-29 | 湖南科技大学 | Spraying granulation refrigeration vacuum drying device and method for sludge |
CN105712607B (en) * | 2016-04-28 | 2019-04-16 | 湖南科技大学 | A kind of the spraying granule vacuum freeze-drying apparatus and method of sludge |
CN110183087A (en) * | 2019-05-31 | 2019-08-30 | 武汉美丽东方污泥治理科技有限公司 | A kind of method of sludge Frozen-thawed cycled conditioning and deep dehydration |
CN112028434A (en) * | 2020-08-17 | 2020-12-04 | 中电建水环境科技有限公司 | Plate-frame type sludge freeze-thawing deep dehydration method |
CN112159075A (en) * | 2020-09-27 | 2021-01-01 | 苏州市相城环保技术有限公司 | Sludge freeze dehydration device and sludge dehydration method |
CN112794617A (en) * | 2021-01-06 | 2021-05-14 | 陈傲然 | Intelligent drying equipment with motor input end penetrating through box body |
CN115057606A (en) * | 2022-06-20 | 2022-09-16 | 刘艳菊 | Sludge dewatering method |
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