CN106587565B - Integrated process for continuously dehydrating and solidifying slurry and sludge - Google Patents
Integrated process for continuously dehydrating and solidifying slurry and sludge Download PDFInfo
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- CN106587565B CN106587565B CN201710056379.1A CN201710056379A CN106587565B CN 106587565 B CN106587565 B CN 106587565B CN 201710056379 A CN201710056379 A CN 201710056379A CN 106587565 B CN106587565 B CN 106587565B
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- 239000010802 sludge Substances 0.000 title claims abstract description 217
- 239000002002 slurry Substances 0.000 title claims abstract description 95
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000008569 process Effects 0.000 title claims abstract description 18
- 230000018044 dehydration Effects 0.000 claims abstract description 116
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 116
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 91
- 238000003756 stirring Methods 0.000 claims abstract description 74
- 239000000654 additive Substances 0.000 claims abstract description 28
- 230000000996 additive effect Effects 0.000 claims abstract description 28
- 238000007711 solidification Methods 0.000 claims abstract description 19
- 230000008023 solidification Effects 0.000 claims abstract description 19
- 239000004744 fabric Substances 0.000 claims description 105
- 239000003795 chemical substances by application Substances 0.000 claims description 47
- 230000003750 conditioning effect Effects 0.000 claims description 37
- 230000007246 mechanism Effects 0.000 claims description 34
- 239000002562 thickening agent Substances 0.000 claims description 32
- 230000005484 gravity Effects 0.000 claims description 28
- 239000002131 composite material Substances 0.000 claims description 21
- 239000002245 particle Substances 0.000 claims description 20
- 239000008247 solid mixture Substances 0.000 claims description 20
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 238000001125 extrusion Methods 0.000 claims description 15
- 238000010008 shearing Methods 0.000 claims description 15
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000292 calcium oxide Substances 0.000 claims description 14
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 14
- 238000003825 pressing Methods 0.000 claims description 12
- 239000000843 powder Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 230000007480 spreading Effects 0.000 claims description 11
- 238000003892 spreading Methods 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 10
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 claims description 10
- 229920000642 polymer Polymers 0.000 claims description 10
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 10
- 239000002023 wood Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000002956 ash Substances 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 9
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 8
- 238000009826 distribution Methods 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 7
- 238000011010 flushing procedure Methods 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- 239000004115 Sodium Silicate Substances 0.000 claims description 5
- VBIIFPGSPJYLRR-UHFFFAOYSA-M Stearyltrimethylammonium chloride Chemical group [Cl-].CCCCCCCCCCCCCCCCCC[N+](C)(C)C VBIIFPGSPJYLRR-UHFFFAOYSA-M 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 239000011790 ferrous sulphate Substances 0.000 claims description 5
- 235000003891 ferrous sulphate Nutrition 0.000 claims description 5
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims description 5
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 5
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000011780 sodium chloride Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 208000005156 Dehydration Diseases 0.000 abstract description 94
- 230000000694 effects Effects 0.000 abstract description 15
- 239000002689 soil Substances 0.000 abstract description 11
- 230000009467 reduction Effects 0.000 abstract description 4
- 238000007385 chemical modification Methods 0.000 abstract 1
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- 238000010276 construction Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 230000001143 conditioned effect Effects 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 239000010419 fine particle Substances 0.000 description 4
- 238000012216 screening Methods 0.000 description 4
- 239000013049 sediment Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 239000008394 flocculating agent Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 241000233866 Fungi Species 0.000 description 1
- 239000005909 Kieselgur Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
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- 230000035484 reaction time Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
Abstract
The invention provides a slurry and sludge continuous dehydration and solidification integrated system which comprises concentration equipment, stirring equipment, dehydration equipment, a sludge adding pump and an additive adding pump, wherein the concentration equipment, the stirring equipment and the dehydration equipment are sequentially communicated through pipelines, and the concentration equipment is also respectively connected with the sludge adding pump and the additive adding pump through pipelines. The invention further provides a continuous dehydration and solidification integrated process for the slurry and the sludge. The continuous dehydration and solidification integrated process for the slurry and the silt can be used for carrying out dehydration treatment on the slurry or the silt with the water content of 70-90%, and the water content is reduced to 20-40% by combining chemical modification and mechanical dehydration, so that the reduction effect is obvious, the compressive strength is improved, and the treated building slurry and the river silt can be used as backfill soil or greening soil.
Description
Technical Field
The invention belongs to the technical fields of constructional engineering, municipal engineering and environmental engineering, and relates to a continuous dehydration and solidification integrated process for slurry and sludge.
Background
In the south of Yangtze river, especially in the southeast coastal region, pile foundation is generally adopted as building foundation due to high water level and complicated geological structure, and during pile foundation construction, a great amount of building slurry is generated (4-5 cubic slurry can be generated per cubic natural soil, and thousands or even hundreds of thousands of square slurry can be generated per basic engineering), so that along with the continuous acceleration of the urban process, various projects such as high-rise, super high-rise building, subway, expressway, large bridge and the like are increasingly constructed, and the generation amount of slurry is also increasingly large. Such as environmental pollution and resource waste caused by improper treatment.
The direct discharge of the outward transportation of the slurry accounts for the vast majority of the current slurry treatment capacity, and the rough treatment mode is easy to cause serious environmental pollution and resource waste phenomena: 1) The environment is polluted, the water source is polluted by the random discharge of building mud, natural vegetation is destroyed, soil is hardened, and the beautiful environment is influenced; 2) The water quality is destroyed, mud which is stolen and discharged into the river not only causes the river to be turbid and the ecological safety of the river channel to be destroyed, endangers the safety of urban domestic water, but also causes the river channel to be silted up and influences the navigation of the ship; 3) The municipal facilities are damaged, and mud which is discharged into facilities such as a sewer is extremely easy to damage municipal pipe networks and block the pipelines. Along with the increasingly strict environmental protection policy and increasingly tense land resources in China, the effective treatment of building mud is increasingly urgent.
In order to improve the water quality of rivers and lakes and ensure the smooth river channel, dredging and dredging engineering needs to be carried out. According to statistics, the dredging sludge amount produced by the Zhujiang delta area of China every year only reaches 8000 ten thousand m 3 The river silt water environment has the following current characteristics: the river channel and river network structure is crisscrossed vertically and horizontally, so that the sediment is serious, the pollution of the sediment is serious, and the sediment has wide sources and complex components; serious pollution and numerous factors of water quality. Therefore, in China, the problems of effective treatment and resource utilization of dredging sludge are also needed to be solved.
The dehydration of construction mud and river mud is an important link in the treatment thereof. Currently, the sludge dewatering mode in China mainly comprises mechanical dewatering, including pressure extrusion dewatering, centrifugal dewatering and the like. Common dewatering machines include belt presses, plate and frame presses, vacuum filters, screw press dewaterers, and the like.
Chinese patent CN204727749U discloses a construction slurry processor. The mud enters the vacuum separation tank through the mud inlet, the high-speed gravity rotating motor drives the rotating rod to rotate through the bearing, the rotating blades on the rotating rod agitate the mud, the reverse motor drives the reverse rotating rod to rotate simultaneously, the reverse rotating blades agitate the mud from a vertical angle, thereby the cohesiveness of mud slurry is deeply destroyed, the adhesiveness of composite colloid in decomposed mud liquid, the stability of granular soil and water are accelerated, the mud is discharged into the natural settling tank through the mud discharging pressure pump, the two tanks are alternately operated, one tank is naturally settled, the other tank is pumped and discharged with qualified concentration slurry, the mud pumping pump pumps out the settled mud, the water guiding net filters out the water in the mud, the vacuum suction pump pumps out the water to be sent to the water softener, the high-pressure net flushing gun washes the water guiding net when the water guiding net is blocked, and the water softener softens the treated clear water and leads out through the water outlet pipe. The invention solves the problem that the recycling of the polluted water source can not be reasonably used, avoids the use of chemical products such as flocculating agent and the like, and improves the prior art and equipment. The water content of the dewatered sludge after conditioning is high, and the sludge reduction effect is not obvious.
Chinese patent CN201410413690 discloses a method and apparatus for treating dredging sludge of movable river and lake. The method comprises the following steps: storing sludge in a temporary cofferdam sludge storage pool built at the bank of a river and a lake; step b: lifting the container integrated with the sludge dewatering system to the side of the sludge storage pond; step c: pumping sludge from a sludge storage pool, and sending the sludge into a box type membrane filter press in a sludge dewatering system for filter pressing and dewatering; step d: squeezing by using a squeezing pump; step e: and transferring the sludge with the water content greatly reduced for subsequent recycling treatment. The device comprises a cofferdam mud storage pool, a mud dewatering system and a container for loading the mud dewatering system, wherein the cofferdam mud storage pool is built on the bank of a river and a lake and is used for storing dredging mud. The invention can reduce the water content to a certain extent and reduce the pollution in the transportation process. But has the defects of incapability of continuous operation, separation of mud feeding and filter pressing links, long mud dehydration period, limited treatment capacity, huge equipment volume, high installed power and the like.
Chinese patent CN201210582961.9 discloses a deep dehydration treatment method for sludge in river and internal lakes, which comprises the following steps of Adding load TiO into the sludge 2 Under the action of ultraviolet light, the photoelectric catalyst is introduced into air source to carry high-energy electrons, so that organic matters in sludge, structural water of fungus, water in absorption and crystallization are changed into flowable interstitial water, and then a composite coagulant is added for flocculation reaction, and the dehydration method has the advantages of short reaction time and good dehydration effect, but the dehydration method has higher requirements on equipment, is complex in operation, and is unfavorable for large-scale popularization and utilization.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention aims to provide a continuous dehydration and solidification integrated process for slurry and sludge, which is used for solving the problem that the prior art lacks a continuous dehydration and solidification integrated process which has obvious reduction effect on construction slurry and river sludge with small particles and difficult coagulation sedimentation and can continuously and rapidly run.
In order to achieve the above and other related objects, a first aspect of the present invention provides a system for continuously dewatering and solidifying slurry and sludge, which comprises a concentrating device, a stirring device, a dewatering device, a sludge adding pump, and an additive adding pump, wherein the concentrating device, the stirring device, and the dewatering device are sequentially connected through pipelines, and the concentrating device is further connected with the sludge adding pump and the additive adding pump through pipelines, respectively.
The concentrating equipment, the stirring equipment and the dewatering equipment are sequentially connected through pipelines, namely a mud outlet of the concentrating equipment is communicated with a mud inlet of the stirring equipment through pipelines, and a mud outlet of the stirring equipment is communicated with a mud inlet of the dewatering equipment through pipelines.
Preferably, the concentration device is a sludge thickener, and the sludge thickener is selected from one of a drum sludge thickener or a belt sludge thickener.
More preferably, the rotary drum sludge thickener comprises a sludge conditioning tank and a rotary drum screening device which are connected through a pipeline.
More preferably, the belt type sludge thickener comprises a sludge conditioning tank and a gravity concentration and dehydration structure, wherein the sludge conditioning tank is communicated with a sludge inlet of the gravity concentration and dehydration structure through a pipeline.
Further preferably, a stirring paddle is arranged in the sludge conditioning tank. The stirring paddle can improve the mud-water separation effect.
Still more preferably, a plurality of teeth nails are arranged on the side wall of the stirring paddle, and the teeth nails are triangular. The teeth nails are uniformly distributed on the side wall of the stirring paddle.
The triangular tooth nails can form layered stirring when stirring is carried out by the stirring paddles, so that slurry or silt is fully mixed with the additive, and the mud-water separation effect is improved.
Further preferably, the sludge conditioning tank is connected with a sludge adding pump and an additive adding pump respectively through pipelines.
It is further preferred that the composition comprises, the rotary drum type roller screening device is a conventional existing rotary drum a rotary drum type roller screening device in a sludge thickener. In particular the number of the elements, the drum type drum screen is selected from drum type drum screen in RDT series drum type sludge thickener manufactured by Guangzhou Wujiang environmental protection mud-water separation equipment Co., ltd one of drum type sludge thickener of YNSJ series manufactured by Shanghai Hao environmental engineering Co., ltd. And WN series drum type sludge thickener manufactured by Yixing city oak environmental protection technology Co., ltd.
Still preferably, the gravity concentration dehydration structure comprises a material distribution device, the material distribution device comprises a baffle, a first filter cloth and a filter cloth advancing driving mechanism, the baffle is positioned on two sides of the first filter cloth, and a feed inlet, a material arranging plate and a mud rake unit are sequentially arranged on the first filter cloth along the advancing direction of the first filter cloth.
Most preferably, the first filter cloth is advanced under the drive of the filter cloth advancing drive mechanism. The filter cloth advancing driving mechanism is a conventionally used transmission motor. The first filter cloth is a filter cloth which is conventionally used.
Most preferably, a rubber sealing plate is arranged on the side wall of the baffle close to the first filter cloth. The rubber sealing plate limits the width of the cloth mud, and prevents the phenomenon of mud leakage.
Most preferably, two sides of the material arranging plate are connected with the baffle plate, and a gap exists between the lower end of the material arranging plate and the first filter cloth. The height of the material arranging plate can be adjusted, and the size of a gap between the material arranging plate and the first filter cloth is changed, so that slurry or silt is paved on the first filter cloth at a certain height and is fully distributed on the first filter cloth.
Still further preferably, the mud rake unit comprises a plurality of connecting rods and mud rakes, two ends of each connecting rod are connected with the baffle plate, a plurality of mud rakes are arranged on each connecting rod, and intervals are reserved among the mud rakes.
Most preferably, the mud rake is crescent, and a water leakage hole is arranged at the center of the mud rake. When mud rakes distributed at intervals pass through the sludge rakes, the sludge passes through the rakes in a uniform stripe shape, and water is quickly permeated out from the water leakage holes, so that the mud-water separation effect is improved.
Most preferably, the operation mechanism of the distributing device is as follows: the first filter cloth advances under the drive of filter cloth advancing drive mechanism, and mud water is discharged into the feed inlet after mud conditioning jar separation to distribute on first filter cloth by the feed inlet, mud or silt that distributes on first filter cloth advances along with first filter cloth, manager flitch effect, mud or silt are paved, and the first filter cloth is full of, and rubber closing plate then restricts cloth mud width, prevents to appear running mud phenomenon. When the tiled mud or silt passes through the mud harrows which are distributed at intervals, the mud harrows are divided into strips which are uniformly distributed at intervals, and water can quickly pass through the first filter cloth from the water leakage holes, so that mud and water are fully separated. The mud or the sludge after mud-water separation continues to advance for the next treatment.
Still more preferably, the parts of the gravity concentration and dehydration structure except the distributing device are all conventional parts of the gravity concentration and dehydration structure in the existing belt-type sludge thickener. Specifically, the gravity concentration and dehydration structure is one of the part of gravity concentration and dehydration structure in a JBSD series belt type sludge thickener produced by Sanguis environmental protection equipment technology Co., ltd., the part of gravity concentration and dehydration structure in an XTF series belt type sludge thickener produced by Shanghai Fu-produce machinery Co., ltd., and the part of gravity concentration and dehydration structure in a BTY series belt type sludge thickener produced by Bitian environmental engineering Co., ltd., wuxi.
Preferably, the additive put in the additive adding pump is a composite flocculant.
Preferably, the stirring equipment is a sludge uniformly-distributing machine, a stirring roller and a spiral spreading roller are sequentially arranged in the sludge uniformly-distributing machine along the travelling direction of sludge, and a plurality of stirring teeth nails are arranged on the side wall of the stirring roller. The travelling direction of the sludge is that the sludge enters the sludge uniformly-distributing machine and sequentially passes through the stirring roller and the spiral spreading roller. The stirring roller and the spiral spreading roller can enable the sludge to be distributed more uniformly, and are beneficial to the subsequent dehydration treatment of the sludge.
More preferably, the stirring teeth are zigzag, and the distances between adjacent stirring teeth on the stirring roller are equal. The zigzag stirring teeth nails are uniformly distributed on the stirring roller, so that the sludge crushing effect can be improved, and meanwhile, the mixing effect of sludge and a medicament is improved.
Further preferably, the number of the saw teeth on the saw-tooth stirring teeth is 2-6. Most preferably, the number of saw teeth on the saw-tooth-shaped stirring teeth is 3-5.
More preferably, the two ends of the stirring roller and the spiral spreading roller are respectively and fixedly connected with the inner side wall of the sludge uniformly-distributing machine through bearings, and the bearings at the two ends of the stirring roller and the spiral spreading roller are respectively positioned on the same horizontal plane.
More preferably, the structures which are not mentioned in the sludge uniformly distributing machine are all conventional structures of the existing sludge uniformly distributing machine. Specifically, the structure not involved in the sludge uniformly-distributing machine is the same as that of a sludge uniformly-distributing device with a patent number ZL 201420515470.7.
Preferably, the dewatering device is a belt filter press, a second filter cloth and a filter cloth travelling driving mechanism are arranged in the belt filter press, the belt filter press is provided with a non-dewatering area, a squeezing shearing dewatering area and a high-pressure squeezing dewatering area in the travelling direction of the second filter cloth, and the high-pressure squeezing dewatering area is close to a mud outlet of the belt filter press; a filter cloth tensioning mechanism, a filter cloth deviation correcting mechanism and a filter cloth flushing mechanism are sequentially arranged in the non-dewatering area along the advancing direction of the second filter cloth; two pairs of pressing rollers are arranged in the high-pressure squeezing dehydration area. The opposite pressing rollers in the high-pressure squeezing dewatering area further squeeze and dewater the sludge, so that the water content of the sludge can be further reduced.
More preferably, the second filter cloth is advanced by a filter cloth advancing drive mechanism. The filter cloth advancing driving mechanism is a conventionally used transmission motor.
More preferably, the counter-pressure roller comprises an upper roller and a lower roller, the position of the upper roller is fixed, and the lower roller can be adjusted to move under the driving of the air cylinder. The pressure between the opposite press rolls is adjusted by adjusting the position of the lower roll.
More preferably, the pressure between the pair of press rolls is 0.1 to 0.4Mpa.
More preferably, the structures not mentioned in the belt filter press are all conventional structures in existing belt filter presses. Specifically, the structure not involved in the belt filter press is the same as that in a belt filter press of the TJSD series, model number by Shanghai applied environmental engineering, inc.
More preferably, the basic performance parameters of the second filter cloth are: the joint breaking strength is 2200-2400N/cm, the constant force elongation is 0.4-0.5%, the alkali resistance is less than or equal to 15, and the temperature is Gao Wen ℃.
Further preferably, the basic performance parameters of the second filter cloth are: the joint breaking strength is 2300N/cm, the constant force elongation is 0.45%, the alkali resistance is less than or equal to 14, and the resistance is Gao Wen ℃.
The second filter cloth is high-pressure-resistant filter cloth, can bear higher tensile force, and has higher performances of tensile strength, acid and alkali resistance, temperature change resistance and the like; meanwhile, a proper weaving mode is selected according to the specific properties of the slurry or the silt, so that the composite material has good air permeability and interception performance on slurry or silt particles.
Further preferably, the travelling speed of the second filter cloth is 3 to 10m/min. The advancing speed of the second filter cloth can be adjusted according to the sludge treatment amount and the sludge water content requirement.
More preferably, the tension of the filter cloth in the filter cloth tensioning mechanism is 0.2-0.5 Mpa.
The second aspect of the invention provides a slurry and sludge continuous dehydration and solidification integrated process, which comprises the following steps:
1) The slurry or the sludge is conveyed into the concentration equipment through a pipeline by a sludge feeding pump, meanwhile, the additive is conveyed into the concentration equipment through a pipeline by an additive feeding pump, and after mixing and conditioning, concentration and dehydration are carried out;
preferably, in step 1), the water content of the slurry or sludge is 70-90%.
Preferably, in the step 1), the additive is a compound flocculant aqueous solution with the concentration of 0.5-2.0 per mill.
More preferably, the composite flocculant is in the form of a solid particulate.
More preferably, the adding amount of the composite flocculant is 0.3-1 per mill of the mass of the absolute dry mud.
More preferably, the composite flocculant comprises the following components in parts by weight:
1-2 parts of chloride;
4-6 parts of polyacrylamide.
Further preferably, the chloride is selected from one of sodium chloride or magnesium chloride. The sodium chloride or magnesium chloride is solid particles.
Further preferably, the polyacrylamide is a solid particle.
Preferably, in step 1), the mixed conditioning is performed in a sludge conditioning tank of a concentrating device.
Preferably, in step 1), the time of the mixed conditioning is 30-90 s.
Preferably, in step 1), the principle of the mixed conditioning is as follows: the fluid mud or the mud and the additive (flocculant solution) are respectively conveyed to a mud conditioning tank through a mud adding pump and an additive adding pump, under the action of an internal stirring paddle, the mud or the mud and the additive are fully mixed and are produced, bound water in the mud or the mud is changed into free water, and triangular teeth nails on the stirring paddle can form layered stirring, so that the mud or the mud and the additive are fully mixed, and the mud-water separation effect is improved. The separated mud water is discharged into a drum type drum screen or a gravity concentration dehydration section for the next treatment.
Preferably, in step 1), the concentration and dehydration are performed in a drum-type drum screen or a gravity concentration and dehydration structure of the concentration device.
Preferably, in step 1), the concentrated and dehydrated slurry or sludge is flocculated into particles with a particle size of 300-1000mm. The particles are uniform fine particles.
2) The slurry or the sludge after the concentration and the dehydration are input into stirring equipment and are uniformly distributed after being mixed with curing agent;
Preferably, the operation mechanism of the uniform distribution is as follows: the concentrated and dehydrated slurry or sludge enters the stirring equipment under the action of gravity through a slurry inlet and the curing agent which is added simultaneously to be gradually piled up, and the stirring roller provided with the zigzag stirring tooth nails enables the slurry or sludge and the curing agent to be fully stirred and mixed, so that the slurry or sludge is modified. The fallen modified slurry or sludge further falls on two spiral spreading rollers which rotate simultaneously, at the same speed and in different directions to effectively spread the modified slurry or sludge.
Preferably, in the step 2), the water content of the slurry or sludge after the concentration and dehydration is 55 to 65%.
Preferably, in step 2), the curing agent is in the form of a solid powder, and the particle size of the curing agent powder is less than 200 mesh. The curing agent powder needs to be ground. The curing agent can modify slurry or silt, and the dehydration performance and the compressive strength are improved by changing the internal structure of the curing agent.
Preferably, in the step 2), the adding amount of the curing agent accounts for 1-5% of the mass of the absolute dry mud.
Preferably, in step 2), the curing agent comprises a liquid composition and a solid composition, wherein the adding amount of the liquid composition accounts for 1-6% of the adding mass of the slurry or the sludge after the concentration and dehydration, and the adding amount of the solid composition accounts for 1-6% of the adding mass of the slurry or the sludge after the concentration and dehydration.
More preferably, the liquid composition comprises the following components in parts by weight: 2-8 parts of sodium silicate, 20-40 parts of magnesium chloride, 20-40 parts of ferrous sulfate, 1-2 parts of organic flocculant, 2-8 parts of water reducer and 90-392 parts of water.
Further preferably, the organic flocculant is octadecyl trimethyl ammonium chloride.
Further preferably, the water reducing agent consists of wood sulfonate and naphthalene sulfonate formaldehyde polymer, wherein the weight ratio of the wood sulfonate to the naphthalene sulfonate formaldehyde polymer is 1 (2-3).
More preferably, the solid composition comprises calcium oxide.
Further preferably, the calcium oxide has a water content of less than 2%.
Further preferably, the solid composition further comprises a skeleton agent, the weight ratio of the skeleton agent to the calcium oxide is (0.1-3): 1, and the skeleton agent is composed of one or more of plant ash, fly ash and diatomite.
Still more preferably, the plant ash, the fly ash and the diatomaceous earth each have a water content of less than 2%.
3) And (3) inputting the uniformly distributed slurry or sludge into a dehydration device for dehydration to obtain the required slurry or sludge.
Preferably, in step 3), the dewatering is performed in the press shear dewatering zone and the high pressure press dewatering zone of the dewatering device in sequence.
More preferably, in step 3), the tension of the filter cloth in the squeeze shear dewatering zone is 0.2 to 0.5Mpa.
Preferably, in the step 3), the water content of the slurry or sludge dehydrated in the extrusion shearing dehydration area is 40-50%.
Preferably, in step 3), the pressure between the pair of press rolls in the high-pressure press dewatering zone is 0.1 to 0.4Mpa.
Preferably, in the step 3), the water content of the slurry or sludge dehydrated in the high-pressure squeezing dehydration area is 20-40%.
As described above, the integrated process for continuously dehydrating and solidifying the slurry and the sludge has the following beneficial effects:
(1) The invention provides a continuous dehydration and solidification integrated process for slurry and sludge, which combines concentration, modification and deep dehydration, and provides a continuous dehydration and solidification integrated system for slurry and sludge, which can carry out dehydration treatment on slurry or sludge with the water content of 70-90%, and can realize continuous slurry inlet and continuous slurry outlet.
(2) The continuous dehydration and solidification integrated process for the slurry and the sludge combines medicament modification and mechanical dehydration to carry out deep dehydration on the slurry or the sludge, so that the water content is reduced to 20-40%, and the reduction effect is obvious.
(3) According to the continuous dehydration and solidification integrated process for the slurry and the sludge, provided by the invention, the internal structure of the slurry or the sludge is changed through the action of the special composite flocculant and the curing agent, the dehydration performance of the slurry or the sludge is improved, and the compressive strength is improved.
(4) The integrated process for continuously dehydrating and solidifying the slurry and the sludge is low in price, the medicament is easy to obtain, the total dosage of the medicament (the sum of the flocculating agent and the curing agent) accounts for 1-6% of the mass of the absolute dry sludge, and the operation cost is greatly reduced.
(5) The integrated process for continuously dehydrating and solidifying the slurry and the sludge is suitable for treating the construction slurry and the river sludge, and the construction slurry and the river sludge can be used as backfill soil or greening soil (except special mud quality) after being treated.
Drawings
FIG. 1 is a schematic flow chart of a slurry and sludge continuous dewatering and solidifying integrated process according to the present invention.
FIG. 2 is a cross-sectional view of a sludge conditioning tank according to the present invention.
FIG. 3 is a section A-A of FIG. 2.
Fig. 4 is a plan view of a distributing device in the gravity concentration and dehydration structure in the present invention.
FIG. 5 is a side view of the stirring device of the present invention.
Fig. 6 is a sectional view of B-B in fig. 5.
Fig. 7 is a cross-sectional view of fig. 5 taken along line C-C.
Fig. 8 is a structural view of a dehydrating apparatus according to the present invention.
Reference numerals
1. Additive adding pump
2. Sludge feeding pump
3. Concentrating device
31. Sludge conditioning tank
311. Stirring paddle
3111. Tooth nail
32. Gravity concentration dehydration structure
321. Distributing device
3211. Baffle plate
3212. Feed inlet
3213. Material arranging plate
3214. Mud rake unit
3214a connecting rod
3214b mud rake
3214c water leakage hole
3215. Rubber sealing plate
3216. First filter cloth
33. Rotary drum type roller screening device
4. Stirring equipment
41. Stirring roller
411. Stirring tooth nail
42. Spiral spreading roller
5. Dewatering equipment
51. Non-dewatering zone
511. Filter cloth tensioning mechanism
512. Filter cloth deviation correcting mechanism
513. Filter cloth flushing mechanism
52. Extrusion shear dewatering zone
53. High pressure press dewatering zone
531. Opposite pressing roller
A upper roller
B lower roller
54. Second filter cloth
55. Mud outlet
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1 to 8. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1-8, the invention provides a slurry and sludge continuous dehydration and solidification integrated system, which comprises a concentration device 3, a stirring device 4, a dehydration device 5, a sludge adding pump 2 and an additive adding pump 1, wherein the concentration device 3, the stirring device 4 and the dehydration device 5 are sequentially communicated through pipelines, and the concentration device 3 is also respectively connected with the sludge adding pump 2 and the additive adding pump 1 through pipelines.
In a preferred embodiment, the concentrating device 3 is a sludge thickener selected from one of a drum sludge thickener or a belt sludge thickener. The rotary drum type sludge concentration comprises a sludge conditioning tank 31 and a rotary drum type drum screen 33 which are connected through a pipeline. The belt type sludge thickener comprises a sludge conditioning tank 31 and a gravity concentration dehydration structure 32, wherein the sludge conditioning tank 31 is communicated with a sludge inlet of the gravity concentration dehydration structure 32 through a pipeline.
In a preferred embodiment, as shown in fig. 2-3, a stirring paddle 311 is provided within the sludge conditioning tank 31. The stirring paddle 311 can improve the mud-water separation effect. The side wall of the stirring paddle 311 is provided with a plurality of teeth 3111, and the teeth 3111 are triangular. The teeth 3111 are uniformly distributed on the side wall of the stirring paddle 311. The sludge conditioning tank 31 is connected with the sludge feeding pump 2 and the additive feeding pump 1 through pipelines respectively.
In a preferred embodiment, the drum screen 33 is a drum screen in a conventional existing drum sludge thickener.
In a preferred embodiment, as shown in fig. 4, the gravity concentration and dehydration structure 32 includes a distributing device 321, the distributing device 321 includes a baffle plate 3211, a first filter cloth 3216, and a filter cloth advancing driving mechanism, the baffle plate 3211 is located at two sides of the first filter cloth 3216, and a feed inlet 3212, a material arranging plate 3213, and a mud rake unit 3214 are sequentially disposed on the first filter cloth 3216 along the advancing direction of the first filter cloth 3216. The first filter cloth 3216 is driven by a filter cloth driving mechanism. A rubber sealing plate 3215 is arranged on the side wall of the baffle plate 3211 close to the first filter cloth 3216. Two sides of the material arranging plate 3213 are connected with the baffle plate 3211, and a gap exists between the lower end of the material arranging plate 3213 and the first filter cloth 3216. The mud rake unit 3214 includes a connecting rod 3214a and a mud rake 3214b, the connecting rod 3214a includes a plurality of connecting rods 3214a, two ends of the connecting rod 3214a are connected with the baffle plate 3211, the connecting rod 3214a is provided with a plurality of mud rakes 3214b, and spaces are reserved between the mud rakes 3214 b. The mud rake 3214b is crescent, and a water leakage hole 3214c is formed in the center of the mud rake 3214 b. When the sludge is separated by the sludge rakes 3214b which are distributed at intervals, the sludge passes through the sludge rakes in a uniform stripe shape, and water is quickly permeated out from the water leakage holes 3214c, so that the sludge-water separation effect is improved.
In a preferred embodiment, the parts of the gravity thickening and dewatering structure 32 other than the distributing device 321 are conventional parts of the gravity thickening and dewatering structure of the existing belt type sludge thickener.
In a preferred embodiment, the stirring device 4 is a sludge uniformly-distributing machine, a stirring roller 41 and a spiral spreading roller 42 are sequentially arranged in the sludge uniformly-distributing machine along the travelling direction of the sludge, and a plurality of stirring teeth 411 are arranged on the side wall of the stirring roller 41. The structure which is not mentioned in the sludge uniform distributor is the conventional structure of the existing sludge uniform distributor. Specifically, the structure not involved in the sludge uniformly-distributing machine is the same as that of a sludge uniformly-distributing device with a patent number ZL 201420515470.7.
Further, as shown in fig. 6, the stirring teeth 411 are zigzag, and the distances between adjacent stirring teeth 411 on the stirring roller 41 are equal. The number of the saw teeth on the saw-tooth-shaped stirring teeth 411 is 2-6, preferably 3-5.
Further, as shown in fig. 5-7, two ends of the stirring roller 41 and the spiral spreading roller 42 are respectively and fixedly connected with the inner side wall of the sludge uniformly-distributing machine through bearings, and the bearings at two ends of the stirring roller 41 and the spiral spreading roller 42 are respectively positioned on the same horizontal plane.
In a preferred embodiment, as shown in fig. 8, the dewatering device 5 is a belt filter press, in which a second filter cloth 54 and a filter cloth travelling driving mechanism are arranged, and the belt filter press is provided with a non-dewatering area 51, a squeezing, shearing and dewatering area 52 and a high-pressure squeezing and dewatering area 53 in the travelling direction of the second filter cloth 54, and the high-pressure squeezing and dewatering area 53 is close to a mud outlet 55 of the belt filter press; a filter cloth tensioning mechanism 511, a filter cloth deviation correcting mechanism 512 and a filter cloth flushing mechanism 513 are sequentially arranged in the non-dewatering area 51 along the advancing direction of the second filter cloth 54; two pairs of pressing rollers 531 are arranged in the high-pressure squeezing and dewatering area 53. The opposite pressing roller 531 in the high-pressure squeezing and dewatering area 53 further squeeze and dewaters the sludge, so that the water content of the sludge can be further reduced.
Further, as shown in fig. 8, the second filter cloth 54 is advanced by the filter cloth advance driving mechanism.
Further, as shown in fig. 8, the counter roller 531 includes an upper roller a and a lower roller B, where the position of the upper roller a is fixed, and the position of the lower roller B is adjustable under the driving of an air cylinder. The pressure between the counter roller 531 is adjusted by adjusting the position of the lower roller B. The pressure between the pair of pressing rollers 531 is 0.1-0.4 Mpa.
Further, as shown in fig. 8, the structure not mentioned in the belt filter press is a conventional structure in the existing belt filter press.
Further, as shown in fig. 8, the basic performance parameters of the second filter cloth 54 are: the joint breaking strength is 2200-2400N/cm, the constant force elongation is 0.4-0.5%, the alkali resistance is less than or equal to 15, and the temperature is Gao Wen ℃. Still further, the basic performance parameters of the second filter cloth 54 are: the joint breaking strength is 2300N/cm, the constant force elongation is 0.45%, the alkali resistance is less than or equal to 14, and the resistance is Gao Wen ℃.
Further, as shown in fig. 8, the traveling speed of the second filter cloth 54 is 3 to 10m/min. The tension of the filter cloth in the filter cloth tensioning mechanism 511 is 0.2-0.5 Mpa.
Example 1
The mud or the sludge with the water content of 70-90% is conveyed into a sludge conditioning tank of the concentration equipment through a pipeline by a mud feeding pump, and meanwhile, the compound flocculant aqueous solution with the concentration of 0.5-2.0 per mill is conveyed into the sludge conditioning tank of the concentration equipment through the pipeline by an additive feeding pump for mixed conditioning for 30-90 s. Wherein, the composite flocculant is solid particles, and the adding amount of the composite flocculant is 0.3 to 1 per mill of the mass of the absolute dry mud. The composite flocculant comprises the following components in parts by weight: 1-2 parts of chloride and 4-6 parts of polyacrylamide.
Then the conditioned slurry or sludge is flocculated into uniform fine particles with the particle size of 300-1000mm. And (5) feeding the materials into a rotary drum type roller screen separator or a gravity concentration dehydration structure for concentration dehydration. The water content of the slurry or the sludge after the concentration and the dehydration is 55 to 65 percent, and then the slurry or the sludge is input into stirring equipment and is uniformly distributed after being mixed with curing agent. The curing agent is in a solid powder shape, and the particle size of the curing agent powder is smaller than 200 meshes. The adding amount of the curing agent is 1-5% of the mass of the absolute dry mud. The curing agent comprises a liquid composition and a solid composition, wherein the adding amount of the liquid composition accounts for 1-6% of the adding mass of the concentrated dehydrated slurry or sludge, and the adding amount of the solid composition accounts for 1-6% of the adding mass of the concentrated dehydrated slurry or sludge. The liquid composition comprises the following components in parts by weight: 2-8 parts of sodium silicate, 20-40 parts of magnesium chloride, 20-40 parts of ferrous sulfate, 1-2 parts of organic flocculant, 2-8 parts of water reducer and 90-392 parts of water. The organic flocculant is octadecyl trimethyl ammonium chloride. The water reducer consists of wood sulfonate and naphthalene sulfonate formaldehyde polymer, wherein the weight ratio of the wood sulfonate to the naphthalene sulfonate formaldehyde polymer is 1 (2-3). The solid composition includes calcium oxide. The water content of the calcium oxide is less than 2%. The solid composition also comprises a framework agent, wherein the weight ratio of the framework agent to the calcium oxide is (0.1-3) 1, and the framework agent consists of one or more of plant ash, fly ash and diatomite. The moisture content of plant ash, fly ash and diatomite is less than 2%.
And finally, the uniformly distributed slurry or sludge is input into an extrusion shearing dehydration area in dehydration equipment for dehydration, the tension of filter cloth in the extrusion shearing dehydration area is controlled to be 0.2-0.5 Mpa, and the water content of the slurry or sludge dehydrated by the extrusion shearing dehydration area is 40-50%. And then the slurry or the sludge is input into a high-pressure squeezing dehydration area in a dehydration device for dehydration, the pressure of a counter-pressure roller in the high-pressure squeezing dehydration area is controlled to be 0.1-0.4 Mpa, and the water content of the slurry or the sludge dehydrated by the high-pressure squeezing dehydration area is 20-40%.
Example 2
Building mud with the water content of 75% is conveyed to a sludge conditioning tank of a concentration device through a sludge feeding pump and conveyed to the sludge conditioning tank of the concentration device through a pipeline, and meanwhile, a composite flocculant aqueous solution with the concentration of 1%o is mixed and conditioned for 50s. Wherein, the composite flocculant is solid particles, and the adding amount of the composite flocculant is 0.5 per mill of the mass of the absolute dry mud. The composite flocculant comprises the following components in parts by weight: 1 part of sodium chloride and 5 parts of polyacrylamide.
Then the conditioned slurry is flocculated into uniform fine particles with the particle size of 300-1000mm. Concentrating and dewatering in a drum type drum screen. The water content of the concentrated and dehydrated slurry is 55 percent, and the slurry is input into stirring equipment and uniformly mixed with curing agent. The curing agent is in a solid powder shape, and the particle size of the curing agent powder is smaller than 200 meshes. The adding amount of the curing agent is 2% of the mass of the absolute dry mud. The curing agent comprises a liquid composition and a solid composition, wherein the adding amount of the liquid composition accounts for 2% of the adding mass of the concentrated dehydrated slurry or sludge, and the adding amount of the solid composition accounts for 2% of the adding mass of the concentrated dehydrated slurry or sludge. The liquid composition comprises the following components in parts by weight: 6 parts of sodium silicate, 30 parts of magnesium chloride, 30 parts of ferrous sulfate, 1 part of an organic flocculant, 6 parts of a water reducing agent and 200 parts of water. The organic flocculant is octadecyl trimethyl ammonium chloride. The water reducer consists of wood sulfonate and naphthalene sulfonate formaldehyde polymer, wherein the weight ratio of the wood sulfonate to the naphthalene sulfonate formaldehyde polymer is 1:2. The solid composition includes calcium oxide. The water content of the calcium oxide is less than 2%. The solid composition also comprises a framework agent, wherein the weight ratio of the framework agent to the calcium oxide is 2:1, and the framework agent consists of one or more of plant ash, fly ash and diatomite. The moisture content of plant ash, fly ash and diatomite is less than 2%.
And finally, the uniformly distributed slurry or sludge is input into an extrusion shearing dehydration area in dehydration equipment for dehydration, the tension of filter cloth in the extrusion shearing dehydration area is controlled to be 0.4Mpa, and the water content of the slurry dehydrated by the extrusion shearing dehydration area is 45%. And then the slurry is input into a high-pressure squeezing dehydration area in a dehydration device for dehydration, the pressure of a counter-pressure roller in the high-pressure squeezing dehydration area is controlled to be 0.25Mpa, and the water content of the slurry dehydrated by the high-pressure squeezing dehydration area is 25%. The construction slurry can be used as backfill soil or greening soil after being treated.
Example 3
The river sludge with the water content of 80% is conveyed into a sludge conditioning tank of the concentration equipment through a sludge feeding pump by a pipeline, and meanwhile, the composite flocculant aqueous solution with the concentration of 0.5 per mill is conveyed into the sludge conditioning tank of the concentration equipment through an additive feeding pump by a pipeline for mixed conditioning for 80s. Wherein, the composite flocculant is solid particles, and the adding amount of the composite flocculant is 1 per mill of the mass of the absolute dry mud. The composite flocculant comprises the following components in parts by weight: 2 parts of magnesium chloride and 6 parts of polyacrylamide.
Then the conditioned sludge is flocculated into uniform fine particles with the particle size of 300-1000mm. And (5) inputting the mixture into a gravity concentration dehydration structure for concentration dehydration. The water content of the sludge after the concentration and dehydration is 65 percent, and the sludge is evenly distributed after being input into stirring equipment and mixed with curing agent. The curing agent is in a solid powder shape, and the particle size of the curing agent powder is smaller than 200 meshes. The adding amount of the curing agent is 4% of the mass of the absolute dry mud. The curing agent comprises a liquid composition and a solid composition, wherein the adding amount of the liquid composition accounts for 4% of the adding mass of the concentrated dehydrated slurry or sludge, and the adding amount of the solid composition accounts for 4% of the adding mass of the concentrated dehydrated slurry or sludge. The liquid composition comprises the following components in parts by weight: 4 parts of sodium silicate, 40 parts of magnesium chloride, 40 parts of ferrous sulfate, 2 parts of an organic flocculant, 4 parts of a water reducing agent and 300 parts of water. The organic flocculant is octadecyl trimethyl ammonium chloride. The water reducer consists of wood sulfonate and naphthalene sulfonate formaldehyde polymer, wherein the weight ratio of the wood sulfonate to the naphthalene sulfonate formaldehyde polymer is 1:3. The solid composition includes calcium oxide. The water content of the calcium oxide is less than 2%. The solid composition also comprises a framework agent, wherein the weight ratio of the framework agent to the calcium oxide is 1:1, and the framework agent consists of one or more of plant ash, fly ash and diatomite. The moisture content of plant ash, fly ash and diatomite is less than 2%.
And finally, the slurry or the sludge after being uniformly distributed is input into an extrusion shearing dehydration area in a dehydration device for dehydration, the tension of filter cloth in the extrusion shearing dehydration area is controlled to be 0.35Mpa, and the water content of the sludge dehydrated by the extrusion shearing dehydration area is 50%. And then the sludge is input into a high-pressure squeezing dehydration area in a dehydration device for dehydration, the pressure of a counter-pressure roller in the high-pressure squeezing dehydration area is controlled to be 0.2Mpa, and the water content of the sludge dehydrated by the high-pressure squeezing dehydration area is 40%. The river sludge can be used as backfill soil or greening soil after being treated.
Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (6)
1. The slurry and sludge continuous dehydration and solidification integrated process is carried out by adopting a slurry and sludge continuous dehydration and solidification integrated system, and comprises the following steps:
1) The slurry or the sludge is conveyed into the concentration equipment through a pipeline by a sludge feeding pump, meanwhile, the additive is conveyed into the concentration equipment through a pipeline by an additive feeding pump, and after mixing and conditioning, concentration and dehydration are carried out;
2) The slurry or the sludge after the concentration and the dehydration are input into stirring equipment and are uniformly distributed after being mixed with curing agent;
3) The slurry or the sludge after being uniformly distributed is input into a dehydration device for dehydration, and the required slurry or the sludge is obtained;
in the step 1), the additive is a compound flocculant aqueous solution with the concentration of 0.5-2.0 per mill; the adding amount of the composite flocculant is 0.3-1 per mill of the mass of the absolute dry mud;
the composite flocculant comprises the following components in parts by weight:
1-2 parts of chloride;
4-6 parts of polyacrylamide;
the chloride is selected from one of sodium chloride or magnesium chloride;
in the step 1), the time of mixing and conditioning is 30-90 s;
in the step 1), the slurry or sludge after the concentration and dehydration is flocculated into particles with the particle size of 300-1000mm;
in the step 2), the curing agent is in a solid powder shape, and the particle size of the curing agent powder is smaller than 200 meshes; the adding amount of the curing agent accounts for 1-5% of the mass of the absolute dry mud;
In the step 2), the curing agent comprises a liquid composition and a solid composition, wherein the adding amount of the liquid composition accounts for 1-6% of the adding mass of the concentrated dehydrated slurry or sludge, and the adding amount of the solid composition accounts for 1-6% of the adding mass of the concentrated dehydrated slurry or sludge;
the liquid composition comprises the following components in parts by weight: 2-8 parts of sodium silicate, 20-40 parts of magnesium chloride, 20-40 parts of ferrous sulfate, 1-2 parts of an organic flocculant, 2-8 parts of a water reducing agent and 90-392 parts of water;
the organic flocculant is octadecyl trimethyl ammonium chloride; the water reducer consists of wood sulfonate and naphthalene sulfonate formaldehyde polymer, wherein the weight ratio of the wood sulfonate to the naphthalene sulfonate formaldehyde polymer is 1 (2-3);
the solid composition comprises calcium oxide; the solid composition also comprises a framework agent, wherein the weight ratio of the framework agent to the calcium oxide is (0.1-3) 1, and the framework agent consists of one or more of plant ash, fly ash and diatomite;
the slurry and sludge continuous dehydration and solidification integrated system comprises a concentration device (3), a stirring device (4), a dehydration device (5), a sludge adding pump (2) and an additive adding pump (1), wherein the concentration device (3), the stirring device (4) and the dehydration device (5) are sequentially communicated through pipelines, and the concentration device (3) is further connected with the sludge adding pump (2) and the additive adding pump (1) through pipelines respectively;
The concentration equipment (3) is a sludge thickener, and the sludge thickener is selected from one of a rotary drum type sludge thickener and a belt type sludge thickener; the rotary drum type sludge thickener comprises a sludge conditioning tank (31) and a rotary drum type drum screen separator (33) which are connected through a pipeline; the belt type sludge thickener comprises a sludge conditioning tank (31) and a gravity concentration and dehydration structure (32), wherein the sludge conditioning tank (31) is communicated with a sludge inlet of the gravity concentration and dehydration structure (32) through a pipeline;
the gravity concentration dehydration structure (32) comprises a distribution device (321), the distribution device (321) comprises a baffle plate (3211), a first filter cloth (3216) and a filter cloth advancing driving mechanism, the baffle plate (3211) is positioned at two sides of the first filter cloth (3216), and a feed inlet (3212), a material arranging plate (3213) and a mud rake unit (3214) are sequentially arranged on the first filter cloth (3216) along the advancing direction of the first filter cloth (3216);
the distribution device (321) further comprises any one or more of the following conditions:
a1 A rubber sealing plate (3215) is arranged on the side wall of the baffle plate (3211) close to the first filter cloth (3216);
a2 Two sides of the material arranging plate (3213) are connected with the baffle plate (3211), and a gap exists between the lower end of the material arranging plate (3213) and the first filter cloth (3216);
A3 The mud rake unit (3214) comprises a connecting rod (3214 a) and mud rakes (3214 b), the connecting rod (3214 a) is provided with a plurality of connecting rods, two ends of each connecting rod (3214 a) are connected with the baffle plate (3211), the connecting rod (3214 a) is provided with a plurality of mud rakes (3214 b), and intervals are reserved among the mud rakes (3214 b);
the mud rake is crescent, and a water leakage hole is formed in the center of the mud rake;
the dewatering equipment (5) is a belt filter press, a second filter cloth (54) and a filter cloth advancing driving mechanism are arranged in the belt filter press, a non-dewatering area (51), an extrusion shearing dewatering area (52) and a high-pressure squeezing dewatering area (53) are arranged in the advancing direction of the second filter cloth (54) of the belt filter press, and the high-pressure squeezing dewatering area (53) is close to a mud outlet (55) of the belt filter press; a filter cloth tensioning mechanism (511), a filter cloth deviation correcting mechanism (512) and a filter cloth flushing mechanism (513) are sequentially arranged in the non-dewatering area (51) along the advancing direction of the second filter cloth (54); two pairs of pressing rollers (531) are arranged in the high-pressure squeezing dehydration area (53);
the basic performance parameters of the second filter cloth (54) are as follows: the joint breaking strength is 2200-2400N/cm, the constant force elongation is 0.4-0.5%, the alkali resistance is less than or equal to 15, and the resistance is Gao Wen ℃ at 150 ℃;
In the step 3), the tension of the filter cloth in the extrusion shearing dewatering area is 0.2-0.5 mpa; the pressure between the opposite pressing rollers in the high-pressure squeezing dewatering area is 0.1-0.4 mpa.
2. The slurry and sludge continuous dehydration and solidification integrated system is characterized by comprising a concentration device (3), a stirring device (4), a dehydration device (5), a sludge adding pump (2) and an additive adding pump (1), wherein the concentration device (3), the stirring device (4) and the dehydration device (5) are sequentially communicated through pipelines, and the concentration device (3) is further connected with the sludge adding pump (2) and the additive adding pump (1) through pipelines respectively;
the concentration equipment (3) is a sludge thickener, and the sludge thickener is selected from one of a rotary drum type sludge thickener and a belt type sludge thickener; the rotary drum type sludge thickener comprises a sludge conditioning tank (31) and a rotary drum type drum screen separator (33) which are connected through a pipeline; the belt type sludge thickener comprises a sludge conditioning tank (31) and a gravity concentration and dehydration structure (32), wherein the sludge conditioning tank (31) is communicated with a sludge inlet of the gravity concentration and dehydration structure (32) through a pipeline;
the gravity concentration dehydration structure (32) comprises a distribution device (321), the distribution device (321) comprises a baffle plate (3211), a first filter cloth (3216) and a filter cloth advancing driving mechanism, the baffle plate (3211) is positioned at two sides of the first filter cloth (3216), and a feed inlet (3212), a material arranging plate (3213) and a mud rake unit (3214) are sequentially arranged on the first filter cloth (3216) along the advancing direction of the first filter cloth (3216);
The distribution device (321) further comprises any one or more of the following conditions:
a1 A rubber sealing plate (3215) is arranged on the side wall of the baffle plate (3211) close to the first filter cloth (3216);
a2 Two sides of the material arranging plate (3213) are connected with the baffle plate (3211), and a gap exists between the lower end of the material arranging plate (3213) and the first filter cloth (3216);
a3 The mud rake unit (3214) comprises a connecting rod (3214 a) and mud rakes (3214 b), the connecting rod (3214 a) is provided with a plurality of connecting rods, two ends of each connecting rod (3214 a) are connected with the baffle plate (3211), the connecting rod (3214 a) is provided with a plurality of mud rakes (3214 b), and intervals are reserved among the mud rakes (3214 b);
the mud rake is crescent, and a water leakage hole is formed in the center of the mud rake;
the dewatering equipment (5) is a belt filter press, a second filter cloth (54) and a filter cloth advancing driving mechanism are arranged in the belt filter press, a non-dewatering area (51), an extrusion shearing dewatering area (52) and a high-pressure squeezing dewatering area (53) are arranged in the advancing direction of the second filter cloth (54) of the belt filter press, and the high-pressure squeezing dewatering area (53) is close to a mud outlet (55) of the belt filter press; a filter cloth tensioning mechanism (511), a filter cloth deviation correcting mechanism (512) and a filter cloth flushing mechanism (513) are sequentially arranged in the non-dewatering area (51) along the advancing direction of the second filter cloth (54); two pairs of pressing rollers (531) are arranged in the high-pressure squeezing dehydration area (53);
The basic performance parameters of the second filter cloth (54) are as follows: the joint breaking strength is 2200-2400N/cm, the constant force elongation is 0.4-0.5%, the alkali resistance is less than or equal to 15, and the temperature is Gao Wen ℃.
3. The integrated system for continuous dehydration and solidification of mud and sludge according to claim 2, wherein a stirring paddle (311) is arranged in the sludge conditioning tank (31); a plurality of teeth nails (3111) are arranged on the side wall of the stirring paddle (311), and the teeth nails (3111) are triangular.
4. The integrated system for continuously dewatering and solidifying slurry and sludge according to claim 2, wherein the stirring device (4) is a sludge uniformly-distributing machine, a stirring roller (41) and a spiral spreading roller (42) are sequentially arranged in the sludge uniformly-distributing machine along the travelling direction of the sludge, and a plurality of stirring tooth nails (411) are arranged on the side wall of the stirring roller (41).
5. The integrated system for continuous dewatering and solidification of sludge and mud according to claim 4, wherein said stirring teeth (411) are zigzag, and the distances between adjacent stirring teeth (411) on said stirring roller (41) are equal.
6. A slurry and sludge continuous dewatering and solidification integrated system according to claim 2, characterized in that the dewatering device (5) further comprises any one or more of the following conditions:
C1 The counter-pressure roller (531) comprises an upper roller (A) and a lower roller (B), the position of the upper roller (A) is fixed, and the lower roller (B) can be driven by an air cylinder to adjust the moving position;
c2 The pressure between the pair of pressing rollers (531) is 0.1-0.4 mpa.
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| CN110028222A (en) * | 2019-04-02 | 2019-07-19 | 叶文勇 | A kind of construction slurry solidification processing method |
| CN110127988B (en) * | 2019-04-22 | 2021-11-02 | 浙江大学宁波理工学院 | Method for treating polluted sludge through electroosmosis and solidification combination |
| CN110294587A (en) * | 2019-04-26 | 2019-10-01 | 杨恒 | A kind of de- dry technique of coal slime unsticking |
| CN110818219A (en) * | 2019-12-10 | 2020-02-21 | 无锡市太湖湖泊治理股份有限公司 | Sludge dewatering device |
| CN112321029A (en) * | 2020-11-23 | 2021-02-05 | 中冶赛迪工程技术股份有限公司 | Continuous casting turbid circulating water treatment system and process |
| CN112645552A (en) * | 2020-11-26 | 2021-04-13 | 江苏建筑职业技术学院 | Silt is administered with silt solidification equipment that can two-way pay-off |
| CN113292219B (en) * | 2021-06-02 | 2022-10-11 | 上海申耀环保工程有限公司 | V-shaped belt type dewatering equipment capable of self-adapting to sludge concentration and application thereof |
| CN115385541A (en) * | 2022-08-23 | 2022-11-25 | 石家庄学院 | Sludge press-drying treatment device and working method thereof |
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