CN114956233A - Low-temperature concentration and quality-grading treatment method for sewage - Google Patents
Low-temperature concentration and quality-grading treatment method for sewage Download PDFInfo
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- CN114956233A CN114956233A CN202210670724.1A CN202210670724A CN114956233A CN 114956233 A CN114956233 A CN 114956233A CN 202210670724 A CN202210670724 A CN 202210670724A CN 114956233 A CN114956233 A CN 114956233A
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- 239000010865 sewage Substances 0.000 title claims abstract description 207
- 238000000034 method Methods 0.000 title claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 277
- 238000010438 heat treatment Methods 0.000 claims abstract description 82
- 238000005192 partition Methods 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000003860 storage Methods 0.000 claims abstract description 27
- 230000018044 dehydration Effects 0.000 claims abstract description 19
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 19
- 238000001704 evaporation Methods 0.000 claims description 28
- 230000008020 evaporation Effects 0.000 claims description 28
- 230000008569 process Effects 0.000 claims description 21
- 238000007599 discharging Methods 0.000 claims description 10
- 238000009388 chemical precipitation Methods 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 8
- 230000007246 mechanism Effects 0.000 claims description 7
- 239000012141 concentrate Substances 0.000 claims description 4
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 238000010924 continuous production Methods 0.000 abstract description 7
- 230000010354 integration Effects 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 7
- 229910001385 heavy metal Inorganic materials 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 6
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- 239000000149 chemical water pollutant Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000012528 membrane Substances 0.000 description 3
- 238000012163 sequencing technique Methods 0.000 description 3
- 238000005292 vacuum distillation Methods 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 229910052698 phosphorus Inorganic materials 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/10—Vacuum distillation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/043—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
Abstract
The invention provides a sewage low-temperature concentration quality-grading treatment method, which is characterized in that sewage is concentrated and quality-graded by a sewage treatment device, the sewage treatment device comprises a high-level storage tank and a processor, and the processor comprises a heating box, a dewatering box, a vacuum pump and a concentrated solution water tank; the heating box is arranged below the high-level storage tank; a plurality of heaters are arranged in the heating box; the dehydration box is fixed on the side surface of the heating box, and the upper part of the side wall of the dehydration box is provided with a water outlet communicated with the upper side inside the heating box; a plurality of layers of partition plates are arranged in the dewatering box from top to bottom; the vacuum pump is arranged at the top of the dewatering box, and the air exhaust end of the vacuum pump is communicated with the inner side of the top of the dewatering box; the concentrated solution water tank is arranged at the bottom of the dewatering tank and is communicated with the bottom of the dewatering tank through a connecting pipe with a valve II; the sewage water inlet end forms a liquid seal through the first valve and the heating box, so that the dewatering box becomes a closed space. The invention can realize continuous production; the automation degree is high; the treatment cost is low; the equipment is simple and the integration is high; the sewage treatment capacity is large, and the treatment efficiency is high.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a low-temperature concentration and quality-grading treatment method for sewage.
Background
In production and life, special sewage which is difficult to treat, such as brewing wastewater, landfill leachate, heavy metal wastewater and the like, is difficult to treat to reach the standard by using a common sewage treatment process or depending on the existing urban sewage treatment plant.
The conventional treatment method of the wine-making wastewater and the landfill leachate is to carry out front-end treatment by anaerobic fermentation, chemical precipitation and other processes to remove most of pollutants such as COD, ammonia nitrogen, total phosphorus and the like in the wastewater, and then carry out subsequent treatment by utilizing an activated sludge method or a contact oxidation method sewage treatment process. The front-end processing equipment is large in investment, long in processing time and high in processing cost. The front-end treatment of the brewing wastewater also comprises high-temperature evaporation treatment, namely the brewing wastewater is divided into low-concentration steam condensate and high-concentration concentrated solution in a sequencing batch mode, the low-concentration wastewater is treated by a conventional wastewater treatment process or directly enters a municipal domestic sewage treatment plant for treatment, and the high-concentration concentrated solution is comprehensively utilized as feed or fertilizer. The front-end treatment of the leachate of the refuse landfill is also membrane treatment, namely, water and part of small molecular pollutants pass through the membrane to form low-concentration sewage through the action of the infiltration membrane, most of the pollutants are intercepted to form high-concentration sewage, the low-concentration sewage is treated by the conventional sewage treatment process or directly enters a municipal domestic sewage treatment plant for treatment, and the high-concentration sewage is recharged to the refuse landfill.
Some mining enterprises, or manufacturing enterprises, may generate heavy metal wastewater. The heavy metal wastewater is usually very low in absolute concentration which is lower than 1mg/L, but higher than the discharge standard, and cannot be directly discharged. The sewage producing enterprises can not process the sewage by themselves, but only spend high processing cost and expensive transportation cost and entrust qualified professional units to process the sewage.
The method for treating the brewing wastewater and the heavy metal wastewater by evaporation concentration and quality division is adopted at present, but the method is almost sequencing batch high-temperature normal-pressure evaporation, has high energy consumption, needs to treat waste gas pollution, cannot realize continuous production, and has large occupied area of used equipment, low integration, difficult movement, complex equipment, high investment and high comprehensive operation cost.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a sewage low-temperature concentration and quality-grading treatment method.
The purpose of the invention is realized by the following technical scheme:
a sewage low-temperature concentration quality-grading treatment method is characterized in that sewage is subjected to concentration quality-grading treatment through a sewage treatment device, the sewage treatment device comprises a high-level storage tank filled with sewage and a processor, and the processor comprises a heating box, a dehydration box, a vacuum pump and a concentrated solution water tank; the heating box is arranged below the high-level storage tank and is communicated with the high-level storage tank through a sewage pipe with a valve I; a plurality of heaters are arranged in the heating box; the dehydration box is fixed on the side surface of the heating box, and the upper part of the side wall of the dehydration box is provided with a water outlet communicated with the upper side inside the heating box; a plurality of layers of partition plates are arranged in the dewatering box from top to bottom, and the uppermost first layer of partition plate is positioned below the water outlet; the middle parts of all odd-numbered layers of clapboards and the two ends of all even-numbered layers of clapboards are provided with water outlets communicated with the lower layer space, the edges of the water outlets of all the clapboards are provided with overflow weirs higher than the upper surfaces of the clapboards, and the overflow weirs and the inner wall of the dewatering box form water accumulating tanks with higher edges and lower interiors on the upper surfaces of the clapboards in an enclosing manner; the vacuum pump is arranged at the top of the dewatering box and used for vacuumizing the dewatering box, and the air exhaust end of the vacuum pump is communicated with the inner side of the top of the dewatering box; the concentrated solution water tank is arranged at the bottom of the dewatering tank and is communicated with the bottom of the dewatering tank through a connecting pipe with a valve II; the sewage water inlet end forms a liquid seal through the first valve and the heating box, the water outlet end ensures that the second valve or at least one of the third valves is closed, the dewatering box becomes a closed space, sewage flows out of the high-level storage tank, and after the sewage is sequentially heated by the heating box and dewatered by the dewatering box, most of the sewage becomes steam and is pumped away by the vacuum pump under a vacuum environment, and the rest of the sewage becomes concentrated liquid and flows into the concentrated liquid water tank.
The method for carrying out low-temperature concentration and quality-classification treatment on the sewage by using the sewage treatment device comprises the following steps:
s1, opening a first valve, and putting sewage in a high-level storage tank into a heating box; and after the heating box is filled with sewage, closing the first valve and suspending water inflow.
S2, starting a heater in the heating box to heat the sewage in the heating box; setting the temperature of the water outlet and starting the automatic temperature control. And closing the third valve (17) and the fourth valve (19) and opening the second valve (15).
S3, adding a small amount of water into the circulating water tank to serve as starting working liquid of the vacuum pump, starting the vacuum pump after the temperature of the water outlet of the heating tank reaches a set temperature, and evacuating the dewatering tank; opening the first valve, allowing cold sewage to enter the heating box, and pushing hot sewage in the heating box to enter the dewatering box; and the concentration degree and the treatment speed of the sewage are controlled by a first valve.
S4, after entering the dewatering box, the hot sewage flows into the water accumulating tank of the uppermost-layer partition plate, the evaporation area is enlarged, after the water accumulating tank is full, the hot sewage flows into the water accumulating tank of the lower-layer partition plate, and the hot sewage continuously flows downwards, and in a vacuum environment, a large amount of liquid water in the water accumulating tank and flowing liquid water are volatilized into steam, are pumped away by a vacuum pump and are condensed in a circulating water tank; intermittently discharging the low-concentration sewage in the circulating water tank, and sending the low-concentration sewage to a low-concentration sewage treatment facility for treatment.
S5, the sewage deposited at the bottom of the dewatering box and in the concentrated solution water tank is concentrated solution; intermittently discharging the concentrated solution in the concentrated solution water tank; after the concentrated solution is discharged, closing the third valve (17) and opening the second valve (15); the concentrated solution is sent to be comprehensively utilized, or is subjected to recharging, or chemical precipitation and other methods for treatment.
In order to further increase the treatment capacity and improve the treatment efficiency, the invention further adopts the following sewage treatment device to carry out sewage treatment.
The treater of the sewage treatment device also comprises a sewage dispersion mechanism which is arranged in the water tank with the upper surface area of the clapboard and can move up and down. The sewage dispersion mechanism comprises a lifting device, a bracket, a movable rod and a movable groove; the lifting device is suspended at the top of the dewatering box through a bracket, and the telescopic end of the lifting device moves downwards and periodically up and down; the movable rod is vertically arranged in the dewatering box, the upper end of the movable rod penetrates through the top of the dewatering box and then is fixedly connected with the telescopic end of the lifting device, and the lower end of the movable rod sequentially penetrates through the water outlet in the middle of the odd-numbered layer of partition boards and the middle of the even-numbered layer of partition boards from top to bottom and can freely move up and down; the movable groove is a frame body which is placed in the water accumulating grooves of the even-numbered layers of the partition plates and sleeved outside the movable rod, a plurality of through openings are formed in the bottom of the movable groove, and the middle part of the movable groove is fixed on the movable rod and can move up and down along with the movable rod.
The sewage low-temperature concentration and quality-grading treatment method by utilizing the further improved sewage treatment device comprises the following steps:
s1, opening a first valve, and putting sewage in a high-level storage tank into a heating box; after the heating box is filled with sewage, closing the first valve and suspending water inflow;
s2, starting a heater in the heating box to heat the sewage in the heating box; setting the temperature of the water outlet, and starting automatic temperature control;
s3, adding a small amount of water into the circulating water tank to serve as starting working liquid of the vacuum pump, starting the vacuum pump after the temperature of the water outlet of the heating tank reaches a set temperature, and evacuating the dewatering tank; opening the first valve, allowing cold sewage to enter the heating box, and pushing hot sewage in the heating box to enter the dewatering box; and the concentration degree and the treatment speed of the sewage are controlled by a first valve.
S4, after entering the dewatering box, the hot sewage flows into the water accumulating tank of the uppermost-layer partition plate, the evaporation area is enlarged, after the water accumulating tank is full, the hot sewage flows into the water accumulating tank of the lower-layer partition plate, and the hot sewage continuously flows downwards, and in a vacuum environment, a large amount of liquid water in the water accumulating tank and flowing liquid water are volatilized into steam, are pumped away by a vacuum pump and are condensed in a circulating water tank; intermittently discharging the low-concentration sewage in the circulating water tank, and sending the low-concentration sewage to a low-concentration sewage treatment facility for treatment; starting a lifting device in the process that water flows in the dewatering box, wherein the lifting device drives a movable groove to move up and down periodically through a movable rod, so that the movable groove enters or leaves a water collecting groove periodically, and water is stirred and dispersed; the sewage flows out from the water outlet of the odd-level partition plate and then falls into the movable groove, after the movable groove is filled with water, the movable rod drives the movable groove to move upwards, the sewage flows out from the through hole at the bottom of the movable groove to form a plurality of linear water columns, and the linear water columns are quickly changed into steam to be pumped away in the flowing process.
S5, the sewage deposited at the bottom of the dewatering box and in the concentrated solution water tank is concentrated solution; intermittently discharging the concentrated solution in the concentrated solution water tank; after the concentrated solution is discharged, closing the third valve (17) and opening the second valve (15); the concentrated solution is sent to be comprehensively utilized, or is subjected to recharging, or chemical precipitation and other methods for treatment.
The invention has the beneficial effects that:
first, continuous production can be achieved. Compared with the conventional normal-pressure evaporation process, the vacuum distillation technology can greatly improve the evaporation rate and create conditions for continuous production; the inlet and outlet liquid sealing mode is adopted, the difficult problem of sealing of feeding and discharging is solved, and continuous production is realized.
Secondly, the degree of automation is high. Due to the fact that continuous production can be achieved, compared with a traditional sequencing batch type sewage evaporation process, a plurality of operation links can be reduced, and automatic control can be achieved in a plurality of links.
Thirdly, the treatment cost is low. The vacuum distillation technology is adopted to reduce energy consumption, the continuous production improves the treatment efficiency, the automatic control saves manpower, the process equipment is simple, the failure rate is reduced, and therefore, the treatment cost is low.
Fourth, the device is simple and highly integrated. The sewage treatment device mainly comprises a high-level storage tank and a processor, and has simple structure and small floor area. The sewage treatment is mainly carried out in the treater, and the treater compact structure integrates the height, and it is convenient to remove.
Fifthly, the sewage treatment capacity is large, and the treatment efficiency is high. The evaporation surface of the sewage is enlarged by arranging a plurality of layers of water accumulation grooves and a plurality of overflow weirs in the dewatering box; simultaneously through further setting up dirty water dispersion mechanism, increased the activity and the evaporation surface of sewage at the dewatering box, further promoted the evaporation of water, increaseed sewage treatment capacity, evaporation efficiency is higher.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of a sewage treatment apparatus according to embodiment 1 of the present invention;
FIG. 2 is a schematic structural view of a sewage treatment apparatus according to embodiment 2 of the present invention;
FIG. 3 is a schematic structural view of a sewage treatment apparatus according to embodiment 2 of the present invention when a movable tank is lifted;
shown in the figure: 1-high storage tank, 2-heating tank, 3-dewatering tank, 4-vacuum pump, 5-circulating water tank, 6-concentrated solution water tank, 7-partition plate, 8-heater, 9-sewage pipe, 10-valve I, 11-water outlet, 12-overflow weir, 13-water outlet, 14-connecting pipe, 15-valve II, 16-sewage pipe, 17-valve III, 18-water outlet pipe, 19-valve IV, 20-lifting device, 21-support, 22-movable rod and 23-movable groove.
Detailed Description
The embodiments of the present invention are described in detail below, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present invention. The described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right", "middle", etc. used in the present specification are for convenience of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms may be changed or adjusted without substantial technical change.
Example 1:
the invention relates to a sewage low-temperature concentration quality-divided treatment method, which divides difficult-to-treat brewing wastewater, garbage percolate, heavy metal wastewater and the like into steam condensate and concentrated solution by a sewage treatment device by utilizing a vacuum distillation technology, wherein the steam condensate can be treated by a simple, mature and economic method, and the concentrated solution can be treated by comprehensive utilization, recharge, chemical precipitation and other methods.
As shown in fig. 1, the sewage treatment apparatus includes a high-level tank 1 and a treater.
The high-level storage tank 1 is used for containing sewage, and the sewage comprises brewing wastewater, landfill leachate, heavy metal wastewater and the like.
The treater includes heating cabinet 2, dehydration box 3, vacuum pump 4, concentrate water tank 6, and heating cabinet 2, dehydration box 3, concentrate water tank 6 all are the body coupling.
The heating box 2 is arranged below the high-level storage tank 1 and is communicated with the high-level storage tank 1 through a sewage pipe 9 with a valve I10. One end of the sewage pipe 9 is communicated with the water outlet end at the bottom of the high-level storage tank 1, the other end of the sewage pipe is communicated with the bottom of the heating tank 2, and a valve I10 arranged on the sewage pipe 9 is used for controlling sewage to enter the heating tank 2. Inside being equipped with a plurality of heaters 8 at heating cabinet 2, heater 8 is electric heater (like electrothermal tube or electric rod), and heater 8 is inside by lower supreme range in heating cabinet 2, and sewage is by lower supreme flow, and the temperature can rise gradually, and 1 ~ 2 heater connections that are located the top have the temperature controller for the temperature of control delivery port 13 department, accomplish that delivery port 13 temperature will be controllable, and the sewage temperature that delivery port 13 flows is less than 100 ℃.
The dehydration box 3 is fixed on the side surface of the heating box 2, the upper part of the side wall of the dehydration box 3 is provided with a water outlet 13 communicated with the upper side inside the heating box 2, the dehydration box 3 and the heating box 2 are integrally connected, so that the dehydration box shares one side wall, the water outlet 13 is arranged on the side wall and is communicated with the upper part inside the dehydration box 3 and the upper part inside the heating box 2, and the height of the water outlet 13 is lower than that of the water outlet end of the high-level storage tank 1. A plurality of layers of partition plates 7 (seven layers are shown in figure 1, the partition plates 7 are in drawer type structures) are arranged in the dewatering box 3 from top to bottom, and the uppermost first layer of partition plate 7 (namely the uppermost partition plate 7 is set as the first layer) is positioned below the water outlet 13; the middle parts of all odd-numbered layers of the clapboards 7 and the two ends of all even-numbered layers of the clapboards 7 are provided with water outlets 11 communicated with the lower layer space, the edges of the water outlets 11 of all the clapboards 7 are provided with overflow weirs 12 higher than the upper surfaces of the clapboards 7, and the overflow weirs 12 and the inner wall of the dewatering box 3 form a water accumulating tank with high edges and low inner parts on the upper surfaces of the clapboards 7. All the odd-numbered layers of baffle plates 7 are annular (square ring or circular ring), after the water in the water collecting tank of the odd-numbered layers of baffle plates 7 is higher than the overflow weir 12 in the middle, the water flows from the overflow weir 12 to the water outlet 11 and flows into the water collecting tank of the lower-numbered layers of baffle plates 7 through the water outlet 11, and similarly, after the water in the water collecting tank of the even-numbered layers of baffle plates 7 is higher than the overflow weirs 12 at the two ends, the water flows into the water collecting tank of the lower-numbered layers of baffle plates 7 from the water outlet 11 at the two ends of the even-numbered layers of baffle plates 7, and the water flows downwards in an alternating manner until the water flows to the bottom of the dewatering box 3.
The vacuum pump 4 is arranged at the top of the dewatering box 3 and used for vacuumizing the dewatering box 3, and the air exhaust end of the vacuum pump 4 is communicated with the inner side of the top of the dewatering box 3; the vacuum pump 4 is a water ring vacuum pump. The vacuum degree in the dewatering box 3 is controlled to-75 to-90 kpa by the vacuum pump 4.
A circulating water tank 5 for supplementing working fluid for the vacuum pump 4 is arranged at the top of the heating tank 2 and the dewatering tank 3; the circulating water tank 5 is communicated with the vacuum pump 4 in a circulating way through two circulating water pipes, and the bottom of the outer side of the circulating water tank 5 is connected with a drain pipe 18 with a valve IV 19. The working fluid in the circulating water tank 5 continuously circulates in the vacuum pump 4 through two circulating water pipes (the circulating water tank 5 and the vacuum pump 4 form an annular loop through the two circulating water pipes), a large amount of water is changed into steam in a negative pressure environment and is pumped away by the vacuum pump 4, and because the temperature difference between the working fluid in the circulating water pipes and the steam entering the vacuum pump 4 is large, the working fluid can effectively reduce the temperature of the steam entering the vacuum pump 4, so that the steam is quickly condensed into water and is blended into the working fluid, and finally the water is introduced into the circulating water tank 5. The water in the circulating water tank 5 is required to be discharged discontinuously through the drain pipe 18 by opening the valve IV 19 at proper time according to the water temperature and the water level, and the water cannot be discharged completely when the water is discharged, so that the operation of the vacuum pump 4 is required to be ensured; and supplementing tap water in a proper amount to ensure the condensation of water vapor. The water in the circulating water tank 5 also contains certain pollutants, but the concentration of the pollutants is far lower than that of the original sewage, and the water can be treated by the process of a common sewage treatment plant or discharged into a town sewage treatment plant for treatment.
The concentrated solution water tank 6 is arranged at the bottom of the dewatering tank 3 and is communicated with the bottom of the dewatering tank 3 through a connecting pipe 14 with a valve II 15, namely one end of the connecting pipe 14 is communicated with the bottom of the inner side of the dewatering tank 3, and the other end of the connecting pipe is communicated with the concentrated solution water tank 6; the sewage water inlet end forms a liquid seal through the valve I and the heating box (the resistance formed by the liquid seal is required to be larger than the pumping force of the water ring pump), the water outlet end ensures that at least one of the valve II or the valve III is closed, the dewatering box 3 becomes a closed space, sewage flows out of the high-level storage tank 1, after being heated by the heating box 2 and dewatered by the dewatering box 3 in sequence, most of the sewage becomes steam and is pumped away by the vacuum pump 4 under a vacuum environment, and the rest of the sewage becomes concentrated liquid and flows into the concentrated liquid water tank 6. The bottom of the concentrated solution water tank 6 is connected with a sewage discharge pipe 16 with a third valve 17. The concentration of water pollutants in the concentrated solution water tank is very high, and the subsequent treatment can be carried out by methods such as comprehensive utilization (such as brewing wastewater), recharging (such as landfill leachate), chemical precipitation (such as heavy metal wastewater) and the like.
The method for carrying out low-temperature concentration and quality-grading treatment on the sewage by adopting the sewage treatment device comprises the following steps:
s1, opening a first valve 10 on a sewage pipe connected with a high-level storage tank 1, and putting sewage in the high-level storage tank 1 into a heating box 2; after the heating tank 2 is filled with sewage (a water level meter and a water temperature meter are arranged on the heating tank 2), the first valve 10 is closed, and water inflow is suspended.
S2, starting a heater 8 in the heating box 2 to heat the sewage in the heating box 2; setting the temperature of the water outlet 13 (lower than 100 ℃, and arranging a water temperature meter near the water outlet 13 to monitor the temperature of the water outlet 13), and starting automatic temperature control (realized by adjusting the temperature of the uppermost heater 8 through a temperature controller to control the temperature). And closing the third valve (17) and the fourth valve (19) and opening the second valve (15).
S3, adding a small amount of water into the circulating water tank 5 to serve as starting working liquid of the vacuum pump 4, starting the vacuum pump 4 after the temperature of the water outlet of the heating tank 2 reaches a set temperature, and evacuating the dewatering tank 3; opening a first valve 10, allowing the cold sewage to enter the heating box 2, and pushing the hot sewage in the heating box 2 to enter the dewatering box 3; the concentration degree and the treatment speed of the sewage are controlled by a first valve 10.
S4, after entering the dewatering box 3, hot sewage flows into the water collecting tank of the uppermost layer partition plate 7, then flows to an overflow weir 12 in the middle of the water collecting tank from the edge of the water collecting tank, the evaporation area is enlarged, after the water collecting tank is full (exceeds the overflow weir 12), the sewage flows into the water collecting tank (the middle) of the lower layer partition plate 7 (even layer partition plate 7), then flows to the water outlets 11 on two sides from the middle of the water collecting tank, and flows onto the lower layer partition plate 7 from the water outlets 11 after the water level exceeds the overflow weir 12, so that the sewage continuously flows downwards, and in a vacuum environment, a large amount of liquid water in the water collecting tank and flowing liquid water are volatilized into steam, are pumped away by a vacuum pump 4 and are condensed in the circulating water tank 5; the low-concentration sewage in the circulating water tank 5 is discharged intermittently and sent to a low-concentration sewage treatment facility for treatment.
S5, the sewage deposited at the bottom of the dewatering box 3 and in the concentrated solution water tank 6 is concentrated solution; intermittently discharging the concentrated solution in the concentrated solution water tank 6; after the concentrated solution is discharged, closing the third valve (17) and opening the second valve (15); the concentrated solution is sent to be comprehensively utilized, or is subjected to recharging, or chemical precipitation and other methods for treatment.
Example 2:
in order to further increase the treatment capacity and improve the treatment efficiency, the invention further adopts the following sewage treatment device to carry out sewage treatment.
This example differs from example 1 in that:
the treater of the sewage treatment device also comprises a sewage dispersion mechanism which is arranged in the water tank with the upper surface area of the clapboard 7 and can move up and down. The sewage dispersion mechanism comprises a lifting device 20, a bracket 21, a movable rod 22 and a movable groove 23.
The lifting device 20 is suspended on the top of the dewatering box 3 through a bracket 21, and the telescopic end of the lifting device moves downwards periodically. The lifting device 20 is selected from any one of a hydraulic cylinder, an electric cylinder, a pneumatic push rod and an electro-hydraulic push rod.
The movable rod 22 is vertically arranged in the dewatering box 3, the upper end of the movable rod penetrates through the top of the dewatering box 3 and then is fixedly connected with the telescopic end of the lifting device 20, and the lower end of the movable rod penetrates through the water discharge port 11 in the middle of the odd-numbered layer partition board 7 and the middle of the even-numbered layer partition board 7 from top to bottom in sequence and can freely move up and down. The middle part of the even-numbered layers of the baffle plates 7 is provided with a cylindrical cofferdam which surrounds the movable rod 22, and the height of the cofferdam is more than or equal to the height of the overflow weir 12 at the edge of the baffle plate 7.
The movable groove 23 is a frame body which is placed in the water accumulation grooves of the even-numbered layers of the partition boards 7 and is sleeved outside the movable rod 22, a plurality of through holes are formed in the bottom of the movable groove, and the middle part (upward bulge) of the movable groove 23 is fixed on the movable rod 22 and can move up and down along with the movable rod 22. The movable groove 23 periodically moves up and down along with the movable rod 22, water in the water collecting groove is further stirred to be activated, evaporation of the water is accelerated, meanwhile, in the process that the movable groove 23 moves up, water flows out from a through opening in the bottom of the movable groove 23 to form a plurality of linear water columns (or waterlines), the sewage evaporation area is further enlarged, the water is dispersed, and evaporation speed of the water is accelerated.
The method for carrying out low-temperature concentration and quality-grading treatment on the sewage by adopting the sewage treatment device comprises the following steps:
s1, opening a first valve 10 on a sewage pipe connected with a high-level storage tank 1, and putting sewage in the high-level storage tank 1 into a heating box 2; after the heating tank 2 is filled with sewage (a water level meter and a water temperature meter are arranged on the heating tank 2), the first valve 10 is closed, and water inflow is suspended.
S2, starting a heater 8 in the heating box 2 to heat the sewage in the heating box 2; setting the temperature of the water outlet 13 (lower than 100 ℃, and arranging a water temperature meter near the water outlet 13 to monitor the temperature of the water outlet 13), and starting automatic temperature control (realized by adjusting the temperature of the uppermost heater 8 through a temperature controller to control the temperature). And closing the third valve (17) and the fourth valve (19) and opening the second valve (15).
S3, adding a small amount of water into the circulating water tank 5 to serve as starting working liquid of the vacuum pump 4, starting the vacuum pump 4 after the temperature of the water outlet 13 of the heating tank 2 reaches a set temperature, and evacuating the dewatering tank 3; opening a first valve 10, allowing the cold sewage to enter the heating box 2, and pushing the hot sewage in the heating box 2 to enter the dewatering box 3; the concentration degree and the treatment speed of the sewage are controlled by a first valve 10.
S4, after entering the dewatering box 3, hot sewage flows into the water accumulating tank of the uppermost layer partition plate 7, then flows to an overflow weir 12 in the middle of the water accumulating tank from the edge of the water accumulating tank, the evaporation area is enlarged, after the water accumulating tank is full (exceeds the overflow weir), the sewage flows to a movable tank 23 (middle part) in the water accumulating tank of a lower layer partition plate 7 (even layers of partition plates), then flows to the water outlets 11 on two sides of the water accumulating tank from the middle part of the movable tank 23, and flows onto the lower layer partition plate 7 from the water outlets 11 after the water level exceeds the two sides of the overflow weir 12 and the movable tank 23, so that the sewage continuously flows downwards, and in a vacuum environment, a large amount of liquid water in the water accumulating tank and flowing water volatilizes into steam, is pumped by a vacuum pump 4 and is condensed in the circulating water tank 5; the low-concentration sewage in the circulating water tank 5 is discharged intermittently and sent to a low-concentration sewage treatment facility for treatment. In the process that water flows in the dewatering box 2, the lifting device 20 is started, the lifting device 20 drives the movable groove 23 to move up and down periodically through the movable rod 22, so that the movable groove 23 enters or leaves the water collecting groove periodically, and water is stirred and dispersed; sewage falls into movable groove 23 after flowing out from the outlet of odd-level layer baffle, after activity groove 23 is full of water, movable rod 22 drives movable groove 23 and shifts up, the in-process moves up in the activity groove 23, sewage constantly flows out from the perforating hole of activity groove 23 bottom and forms many linear water columns (waterlines), enlarge evaporation area, linear water column flow in-process becomes vapor fast and is taken out, the linear water column that leaves simultaneously constantly hits the sewage in the ponding groove, make the sewage activity in the ponding groove promote, further the evaporation of water has been accelerated.
S5, the sewage deposited at the bottom of the dewatering box 3 and in the concentrated solution water tank 6 is concentrated solution; intermittently discharging the concentrated solution in the concentrated solution water tank 6; after the concentrated solution is discharged, closing the third valve (17) and opening the second valve (15); the concentrated solution is sent to be comprehensively utilized, or is subjected to recharging, or chemical precipitation and other methods for treatment.
Example 3:
this example differs from example 2 in that:
in order to further increase the treatment capacity and improve the treatment efficiency, the invention further adopts the following sewage treatment device to carry out sewage treatment; in the embodiment, a movable groove 23 is further added on the basis of the embodiment 2; the added movable groove 23 is installed in the water accumulating groove of the base layer partition 7, and the added movable groove 23 is identical to the base layer partition 7 in shape.
When in use, after hot sewage enters the dewatering box 3, the hot sewage flows to the movable groove 23 (edge) in the water collecting groove of the clapboard 7 at the uppermost layer, then flows from the edge of the movable groove 23 to the direction of the overflow weir 12 at the middle part, the evaporation area is enlarged, after the movable groove 23 is filled with the sewage (the sewage exceeds the overflow weir and the edge of the movable groove 23), the sewage flows to the movable groove 23 (middle part) in the water collecting groove of the clapboard 7 at the lower layer (even layers of clapboards), then flows to the water outlets 11 at two sides of the water collecting groove from the middle part of the movable groove 23, and flows to the clapboard 7 at the lower layer from the water outlets 11 after the water level exceeds the overflow weir 12 and two sides of the movable groove 23, thus continuously flows downwards, in a vacuum environment, a large amount of liquid water in the water collecting groove and the flowing liquid water volatilizes into steam, is pumped by the vacuum pump 4 and is condensed in the circulating water tank 5; the low-concentration sewage in the circulating water tank 5 is discharged intermittently and sent to a low-concentration sewage treatment facility for treatment. In the process that water flows in the dewatering box 2, the lifting device 20 is started, the lifting device 20 drives the movable groove 23 to move up and down periodically through the movable rod 22, so that the movable groove 23 enters or leaves the water collecting groove periodically, and water is stirred and dispersed; the sewage source is constantly flowed to the movable groove 23, after the movable groove 23 is full of water, the movable rod 22 drives the movable groove 23 to move upwards, the movable groove 23 moves upwards, sewage continuously flows out from the through hole at the bottom of the movable groove 23 to form a plurality of linear water columns (waterlines), the evaporation area is enlarged, the linear water columns are quickly changed into vapor in the flowing process and are pumped away, the linear water columns remained simultaneously continuously hit the sewage in the water accumulation groove, the sewage activity in the water accumulation groove is improved, and the evaporation of water is further accelerated.
Example 4:
this example differs from example 2 or 3 in that:
in order to further increase the evaporation speed of water, the movable rod 22 is a hollow structure, and an electric heating tube or an electric heating rod is arranged inside the hollow structure.
Example 5:
this example differs from examples 1-4 in that:
in order to further accelerate the evaporation speed of water and enable the water to fall uniformly, a ring-shaped pipe is fixed on the position, located above the uppermost layer of water accumulation tank, of the inner wall of the dewatering box 3 and communicated with the water outlet 13, and a circle of spraying holes are uniformly formed in the bottom of the ring-shaped pipe. Hot water enters the annular pipe and is sprayed into the water accumulation tank at the uppermost layer from the spraying holes. The annular pipe can be a circle, also can be the annular pipe of many circles concentric settings, and the annular pipe promotes its evaporation area with the abundant and even dispersion of 13 hot water in delivery port for the evaporation rate.
It is to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The scope of the present invention is not limited to the technical solutions disclosed in the embodiments, and any modifications, equivalent substitutions, improvements, etc. made to the above embodiments according to the technical spirit of the present invention fall within the scope of the present invention.
Claims (10)
1. A sewage low-temperature concentration quality-grading treatment method is used for performing concentration quality-grading treatment on sewage through a sewage treatment device, wherein the sewage treatment device comprises a high-level storage tank (1) filled with sewage and a processor, and is characterized in that: the processor comprises a heating box (2), a dewatering box (3), a vacuum pump (4) and a concentrated solution water tank (6); the heating box (2) is arranged below the high-level storage tank (1) and is communicated with the high-level storage tank (1) through a sewage pipe with a valve I (10); a plurality of heaters (8) are arranged in the heating box; the dehydration box (3) is fixed on the side surface of the heating box (2), and a water outlet communicated with the upper side inside the heating box (2) is arranged at the upper part of the side wall of the dehydration box (3); a plurality of layers of partition plates are arranged in the dewatering box (3) from top to bottom, and the first layer of partition plate at the top is positioned below the water outlet; the middle parts of all odd-numbered layers of the partition boards and the two ends of all even-numbered layers of the partition boards are provided with water outlets communicated with the lower layer space, the edges of the water outlets of all the partition boards are provided with overflow weirs higher than the upper surfaces of the partition boards, and the overflow weirs and the inner walls of the dewatering boxes (3) form water accumulating tanks with high edges and low interiors in an enclosing manner on the upper surfaces of the partition boards; the vacuum pump (4) is arranged at the top of the dehydration box (3) and is used for vacuumizing the dehydration box (3), and the air exhaust end of the vacuum pump (4) is communicated with the inner side of the top of the dehydration box (3); the concentrated solution water tank (6) is arranged at the bottom of the dewatering tank (3) and is communicated with the bottom of the dewatering tank (3) through a connecting pipe with a valve II (15); the sewage end of intaking forms the liquid seal through valve one and heating cabinet, goes out the water end and guarantees that valve two or three at least one of valve is closed, makes dehydration tank (3) become airtight space, and sewage flows out from high-order storage tank (1), heats and dehydrates back through heating cabinet (2) in proper order with dehydration tank (3), and under vacuum environment, most become steam and are taken away by the vacuum pump, and remaining becomes in the concentrate water tank (6) of concentrate liquid flow.
2. The method for low-temperature concentration and quality-grading treatment of sewage according to claim 1, characterized in that: the bottom of the concentrated solution water tank (6) is connected with a blow-off pipe with a valve III (17).
3. The method for low-temperature concentration and quality-grading treatment of sewage according to claim 1, characterized in that: heater (8) are electric heater, and the heater is by supreme arranging down in the heating cabinet is inside, and sewage is by supreme flow down, and the temperature can rise gradually, and 1 ~ 2 heater connections that are located the top have the temperature controller.
4. The method for low-temperature concentration and quality-grading treatment of sewage according to claim 1, characterized in that: the vacuum degree in the dewatering box (3) is controlled to be-75 to-90 kpa, and the temperature of the sewage flowing out of the water outlet is less than 100 ℃.
5. The method for low-temperature concentration and quality-grading treatment of sewage according to claim 1, characterized in that: the water outlet end of the high-level storage tank (1) is higher than the water outlet of the heating box (2).
6. The method for low-temperature concentration and quality-grading treatment of sewage according to any one of claims 1 to 5, wherein the method comprises the following steps: the vacuum pump (4) is a water ring vacuum pump, and a circulating water tank (5) for supplementing working liquid to the vacuum pump (4) is arranged at the tops of the heating tank (2) and the dewatering tank (3); the circulating water tank (5) is communicated with the vacuum pump (4) in a circulating mode through two circulating water pipes, and the bottom of the outer side of the circulating water tank (5) is connected with a drain pipe with a valve IV (19).
7. The method for low-temperature concentration and quality-grading treatment of sewage according to claim 6, characterized by comprising the following steps:
s1, opening a first valve (10), and putting sewage in a high-level storage tank (1) into a heating box (2); after the heating box (2) is filled with sewage, closing the first valve (10) and suspending water inflow;
s2, starting a heater (8) in the heating box (2) to heat the sewage in the heating box (2); setting the temperature of the water outlet, and starting automatic temperature control; closing the third valve (17) and the fourth valve (19), and opening the second valve (15);
s3, adding a small amount of water into the circulating water tank (5) to serve as starting working liquid of the vacuum pump (4), starting the vacuum pump (4) after the temperature of the water outlet of the heating tank (2) reaches a set temperature, and evacuating the dewatering tank (3); opening the first valve (10), allowing the cold sewage to enter the heating box (2), and pushing the hot sewage in the heating box (2) to enter the dewatering box (3); controlling the concentration degree and the treatment speed of the sewage through a first valve (10) and a second valve (15);
s4, after entering the dewatering box (3), the hot sewage flows into the water accumulating tank of the uppermost-layer partition plate, the evaporation area is enlarged, after the water accumulating tank is full, the hot sewage flows into the water accumulating tank of the lower-layer partition plate, and the hot sewage continuously flows downwards, and in a vacuum environment, a large amount of liquid water in the water accumulating tank and flowing water volatilizes into steam, is pumped by a vacuum pump (4), and is condensed in a circulating water tank (5); intermittently discharging the low-concentration sewage in the circulating water tank (5) and sending the low-concentration sewage to a low-concentration sewage treatment facility for treatment;
s5, the sewage deposited at the bottom of the dewatering box (3) and in the concentrated solution water tank (6) is concentrated solution; firstly, closing the second valve (15), and then opening the third valve (17) to intermittently discharge the concentrated solution in the concentrated solution water tank (6); after the concentrated solution is discharged, closing the third valve (17) and opening the second valve (15); the concentrated solution is sent to be comprehensively utilized, or is subjected to recharging, or chemical precipitation and other methods for treatment.
8. The method for low-temperature concentration and quality-grading treatment of sewage according to claim 6, characterized by comprising the following steps: the treater still includes and places in baffle upper surface area basin and can reciprocate sewage dispersion mechanism.
9. The method for low-temperature concentration and quality-grading treatment of sewage according to claim 8, characterized in that: the sewage dispersion mechanism comprises a lifting device, a bracket, a movable rod and a movable groove; the lifting device is suspended at the top of the dewatering box through a bracket, and the telescopic end of the lifting device moves downwards and periodically up and down; the movable rod is vertically arranged in the dewatering box, the upper end of the movable rod penetrates through the top of the dewatering box and then is fixedly connected with the telescopic end of the lifting device, and the lower end of the movable rod sequentially penetrates through the water outlet in the middle of the odd-numbered layer of partition boards and the middle of the even-numbered layer of partition boards from top to bottom and can freely move up and down; the movable groove is a frame body which is placed in the water accumulating grooves of the even-numbered layers of the partition plates and sleeved outside the movable rod, a plurality of through openings are formed in the bottom of the movable groove, and the middle part of the movable groove is fixed on the movable rod and can move up and down along with the movable rod.
10. The method for low-temperature concentration and quality-grading treatment of sewage according to claim 9, comprising the steps of:
s1, opening a first valve (10), and putting sewage in a high-level storage tank (1) into a heating box (2); after the heating box (2) is filled with sewage, closing the first valve (10) and suspending water inflow;
s2, starting a heater (8) in the heating box (2) to heat the sewage in the heating box (2); setting the temperature of the water outlet, and starting automatic temperature control; closing the third valve (17) and the fourth valve (19), and opening the second valve (15);
s3, adding a small amount of water into the circulating water tank (5) to serve as starting working liquid of the vacuum pump (4), starting the vacuum pump (4) after the temperature of the water outlet of the heating tank (2) reaches a set temperature, and evacuating the dewatering tank (3); opening the first valve (10), allowing the cold sewage to enter the heating box (2), and pushing the hot sewage in the heating box (2) to enter the dewatering box (3); controlling the concentration degree and the treatment speed of the sewage through a first valve (10) and a second valve (15);
s4, after entering the dewatering box (3), the hot sewage flows into the water collecting tank of the uppermost layer partition plate, the evaporation area is enlarged, after the water collecting tank is full, the hot sewage flows into the water collecting tank of the lower layer partition plate, and the hot sewage continuously flows downwards, and in a vacuum environment, a large amount of liquid water positioned in the water collecting tank and flowing in the water collecting tank volatilizes into steam, is pumped by a vacuum pump (4), and is condensed in a circulating water tank (5); intermittently discharging the low-concentration sewage in the circulating water tank (5) and sending the low-concentration sewage to a low-concentration sewage treatment facility for treatment; in the process that water flows in the dewatering box (3), the lifting device is started, and the lifting device drives the movable tank to periodically move up and down through the movable rod, so that the movable tank periodically enters or leaves the water collecting tank, and water bodies are stirred and dispersed; the sewage flows out of the water outlet of the odd-level partition plate and then falls into the movable groove, after the movable groove is filled with water, the movable rod drives the movable groove to move upwards, the sewage flows out of the through hole at the bottom of the movable groove to form a plurality of linear water columns, and the linear water columns are quickly changed into water vapor to be pumped away in the flowing process;
s5, the sewage deposited at the bottom of the dewatering box (3) and in the concentrated solution water tank (6) is concentrated solution; intermittently discharging the concentrated solution in the concentrated solution water tank (6); after the concentrated solution is discharged, closing the third valve (17) and opening the second valve (15); the concentrated solution is sent to be comprehensively utilized, or is subjected to recharging, or chemical precipitation and other methods for treatment.
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Cited By (1)
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