CN111732260A - Concentration treatment system and concentration treatment method for landfill leachate - Google Patents
Concentration treatment system and concentration treatment method for landfill leachate Download PDFInfo
- Publication number
- CN111732260A CN111732260A CN202010747640.4A CN202010747640A CN111732260A CN 111732260 A CN111732260 A CN 111732260A CN 202010747640 A CN202010747640 A CN 202010747640A CN 111732260 A CN111732260 A CN 111732260A
- Authority
- CN
- China
- Prior art keywords
- waste heat
- percolate
- liquid
- separator
- leachate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- 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
- C02F1/08—Thin film evaporation
-
- 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
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
The invention discloses a concentration processing system and a concentration processing method for landfill leachate, which comprise a stock solution tank, a stock solution pump, a leachate separator, a first heating device, a negative pressure device and a concentrated solution collecting box, wherein the stock solution tank, the stock solution pump and the leachate separator are sequentially connected from upstream to downstream, the leachate separator is respectively connected with the stock solution pump, the negative pressure device and the concentrated solution collecting box, the first heating device is arranged on the leachate separator to heat the leachate in the leachate separator, a leachate vaporization membrane is arranged in the leachate separator, and the leachate vaporization membrane is of a nano-scale membrane structure provided with selective permeable water molecule channels. The invention aims at enterprises with waste heat resources, reduces the boiling point of water by using the negative pressure device, reduces the use threshold of the waste heat resources, and increases the percolation efficiency by using the characteristic of quickly transferring water molecules under the thermal state of the percolation vaporization membrane and matching with waste heat heating.
Description
Technical Field
The invention relates to the field of environment-friendly wastewater treatment, in particular to a concentration treatment system and a concentration treatment method for landfill leachate.
Background
The landfill leachate is derived from water contained in garbage in a garbage landfill, rain, snow and water entering the landfill and other water, the saturated water holding capacity of the garbage and a soil covering layer is deducted, and the garbage and the soil covering layer are subjected to treatment to form high-concentration wastewater, the composition of the wastewater is complex, the pollutant content is high, the chromaticity is high, the toxicity is strong, the wastewater belongs to the wastewater which is difficult to treat in the water treatment industry, and if the wastewater is not properly treated, the surface water quality is influenced, and the safety of underground water is endangered.
In order to avoid the harm of the landfill leachate, the landfill leachate is concentrated and reduced in the industry, a relatively common treatment mode in the industry is a reverse osmosis membrane concentration treatment process, reverse osmosis is also called reverse osmosis, the reverse osmosis process is opposite to the normal osmosis process, pressure is applied to landfill leachate on one side of a membrane, and when the pressure exceeds the osmosis pressure of the reverse osmosis membrane, water molecules in the landfill leachate are reversely percolated against the direction of natural osmosis. The process is carried out at high temperature and high pressure, the original properties of the substances can be kept to a greater extent, but higher pressure needs to be provided during the working of the process, the energy consumption is high, and the concentration efficiency is not high.
Disclosure of Invention
The invention aims to provide a concentration treatment system for landfill leachate and a concentration treatment method for the landfill leachate aiming at the defects of the prior art and enterprises with suitable waste heat resources.
The invention provides a concentration treatment system for landfill leachate, which comprises a stock solution tank, a stock solution pump, a leachate separator, a first heating device, a negative pressure device and a concentrated solution collecting box, wherein the stock solution tank, the stock solution pump and the leachate separator are sequentially connected from upstream to downstream;
the percolation liquid separator is provided with a percolation liquid inlet, a concentrated liquid outlet and a solvent outlet, a percolation vaporization membrane and a steam collecting pipe are arranged in the percolation liquid separator, the percolation vaporization membrane is in a cylindrical shape with one open end, one end of the steam collecting pipe is hermetically connected with the open end of the percolation vaporization membrane, the other end of the steam collecting pipe is connected with the solvent outlet, a fluid channel is formed in an area between the percolation vaporization membrane and the inner wall of the percolation liquid separator, and the percolation liquid inlet and the concentrated liquid outlet are both communicated with the fluid channel;
the percolation vaporization membrane is a nano-scale membrane structure provided with a selective permeability water molecule channel;
the percolate separator is connected with the raw liquid pump through a percolate inlet, is connected with the concentrated liquid collecting box through a concentrated liquid outlet, and is connected with the negative pressure device through a solvent outlet;
the first heating device is arranged on the percolation liquid separator, a first waste heat input end used for inputting waste heat media and a first waste heat output end used for outputting the waste heat media are arranged on the first heating device, and a first circulating pump is arranged on the first waste heat input end or the first waste heat output end.
In a second aspect, the present invention provides a method for concentrating landfill leachate, and preferably, the method is implemented by using the concentration treatment system of the first aspect.
Preferably, the method comprises:
collecting and storing percolate generated in the garbage treatment process through the stock solution tank;
sending the percolate stored in the stock solution tank to a percolate separator through the stock solution pump;
waste heat medium in the first heating device flows in from a first waste heat input end and flows out from a first waste heat output end under the driving of a first circulating pump, the waste heat medium heats percolate in a percolate separator through the first heating device, water molecules in the percolate positioned on one side of the percolation vaporization membrane close to a percolate inlet flow in an accelerated mode, and the water molecules penetrate through a water molecule channel on the wall of the percolation vaporization membrane from the outer side of the percolation vaporization membrane in an accelerated mode to reach the cavity of the cylindrical percolation vaporization membrane;
the negative pressure device applies negative pressure to the cavity of the percolation vaporization membrane, and the boiling point of water is reduced under the negative pressure state to form water vapor which is discharged from the vapor collecting pipe;
when at least a portion of the water in the leachate is removed, the remaining solutes and solvent form a concentrate which is discharged from the concentrate outlet to a concentrate collection tank for subsequent treatment.
In the above disclosure, preferably, a preheating tank is disposed between the raw water pump and the percolate separator, the preheating tank is connected to the raw water pump and the percolate inlet on the percolate separator, the preheating tank is provided with a second heating device for providing heat by using waste heat resources, the second heating device is provided with a second waste heat input end for inputting waste heat media and a second waste heat output end for outputting waste heat media, and the second waste heat input end or the second waste heat output end is provided with a second circulating pump.
Preferably, the raw liquid pump conveys the leachate from the raw liquid tank to the preheating tank, a waste heat medium in the second heating device flows in from the second waste heat input end and flows out from the second waste heat output end under the driving of the second circulating pump, and the waste heat medium preheats the leachate through the second heating device.
Preferably, the whole shape of the stock solution box is cylindrical, a liquid inlet and a liquid outlet are arranged on the stock solution box, a pretreatment assembly for separating impurities in the percolate is arranged in the stock solution box, and the liquid inlet and the liquid outlet are respectively positioned on two sides of the pretreatment assembly.
Preferably, the liquid outlet is connected with a liquid inlet pipe of a stock solution pump, and the percolate entering from the liquid inlet of the stock solution tank is pretreated by the pretreatment layer and then is conveyed into the preheating tank under the driving of the stock solution pump.
Preferably, the filtration mode of the pretreatment module includes, but is not limited to, adsorption filtration and filtration membrane filtration.
Preferably, the adsorption filtration uses a pretreatment layer of suspended solids, wherein the size of the suspended solids in the pretreatment layer is in the range of 10 μm to 20 μm, more preferably 20 μm.
Preferably, the percolation vaporization membrane is based on butadiene-styrene copolymer, and a part of aromatic rings are sulfonated and crosslinked through sulfonation reaction to form a nano-scale membrane structure with selective permeability water molecule channels.
Preferably, the number of the percolation vaporization membranes is multiple, the number of the steam collecting pipes is the same as that of the percolation vaporization membranes, and one ends of the steam collecting pipes, which are far away from the percolation vaporization membranes, are connected with the solvent outlet.
Preferably, the negative pressure device comprises a vacuum pump and a cooling and separating device, and the vacuum pump is connected with the percolate separator through the cooling and separating device.
Preferably, the cooling and separating device comprises a condensing device, a vapor-liquid separator and a solvent storage tank, wherein the vapor-liquid separator is respectively connected with the condensing device, the vacuum pump and the solvent storage tank.
Preferably, under the action of the vacuum pump, air containing water vapor enters the condensing device from the solvent outlet for cooling treatment and then enters the vapor-liquid separator, the vapor-liquid separator performs dry-wet separation on the air, and the water vapor is condensed into liquid water in the vapor-liquid separator and finally discharged to the solvent storage tank for storage.
Preferably, the condensing means includes a condensing pipe, a third circulating pump, and a circulating tank;
the condenser pipe is provided with a first cooling medium input end, a first cooling medium output end, a solvent inlet end and a solvent output end, the solvent inlet end is connected with a solvent outlet, and the solvent output end is connected with a vapor-liquid separator;
the circulating box is provided with a second cooling medium input end, a second cooling medium output end and a cooling medium supplement end, the first cooling medium input end is connected with the second cooling medium output end through a third circulating pump, and the first cooling medium output end is connected with the second cooling medium input end.
Preferably, the cooling medium in the circulation box is driven by a third circulation pump to sequentially flow through the second cooling medium output end, the third circulation pump, the first cooling medium input end, the condensation pipe, the second cooling medium output end, the second cooling medium input end and the circulation box in a circulation manner, and the cooling medium cools air containing water vapor in the condensation pipe.
Preferably, the second cooling medium inlet is arranged at a higher height than the second cooling medium outlet.
Preferably, the cooling medium supplement end is higher than the second cooling medium output end in height.
Preferably, the cooling medium includes, but is not limited to, one or more of cooling water and tap water.
Preferably, the first heating device is a waste heat heating pipe, the first waste heat input end and the first waste heat output end are two end ports of the waste heat heating pipe, and the waste heat heating pipe is fixedly arranged at the bottom of the percolate liquid separator.
Preferably, the waste heat heating tube is coiled around the bottom of the percolate separator.
Preferably, the waste heat heating pipe is welded and fixed at the bottom of the percolation liquid separator through a discontinuous welding process.
Preferably, a heat-conducting daub is arranged in a gap between the waste heat heating pipe and the bottom of the percolate separator.
Preferably, the waste heat medium in the waste heat heating pipe comprises one or more of, but not limited to, boiler blow-off water, steam drainage and extracted steam.
Preferably, the temperature provided by the waste heat medium in the waste heat heating pipe is 60-90 ℃, and more preferably, the temperature provided by the waste heat medium is 60-70 ℃.
Preferably, the second heating device comprises a waste heat preheating pipe, the second waste heat input end and the second waste heat output end are two end ports of the waste heat preheating pipe, and the waste heat preheating pipe is fixedly connected with the side wall of the preheating box.
Preferably, the waste heat preheating pipe is welded and fixed on the side wall of the preheating box through an intermittent welding process.
Preferably, a gap between the waste heat preheating pipe and the side wall of the preheating box is provided with heat-conducting daub.
Preferably, the waste heat preheating pipe is spirally wound on the sidewall of the preheating chamber.
Preferably, the number of the waste heat preheating pipes is multiple, the waste heat preheating pipes are connected in parallel, second waste heat input ends of the waste heat preheating pipes are connected together, and second waste heat output ends of the waste heat preheating pipes are connected together.
Preferably, a plurality of the waste heat preheating pipes are spirally wound on the side wall of the preheating box from top to bottom in sequence.
Preferably, the waste heat medium in the waste heat preheating pipe comprises one or more of, but not limited to, boiler blow-off water, steam drainage and extracted steam.
Preferably, the system further comprises a monitoring device, wherein the monitoring device comprises a control device, a first liquid level sensor, a first conductivity sensor, a first temperature sensor, a second liquid level sensor, a second conductivity sensor, a second temperature sensor and a third liquid level sensor;
wherein the first liquid level sensor, the first conductivity sensor and the first temperature sensor are arranged on the percolation liquid separator, the second liquid level sensor, the second conductivity sensor and the second temperature sensor are arranged on the preheating tank, and the third liquid level sensor is arranged on the vapor-liquid separator;
the control device is respectively connected with the first liquid level sensor, the first conductivity sensor, the first temperature sensor, the second liquid level sensor, the second conductivity sensor, the second temperature sensor and the third liquid level sensor.
Preferably, the control device includes but is not limited to one of a console and an upper computer.
Preferably, a first flowmeter for regulating the flow of the waste heat medium to and from the liquid is arranged on the first waste heat input end or the first waste heat output end, a second flowmeter for regulating the flow of the waste heat medium in and out is arranged on the first waste heat input end or the first waste heat output end, a third flow meter for controlling the feed liquor flow of the percolate is arranged between the stock pump and the preheating tank, a fourth flowmeter used for controlling the output liquid flow of the percolate is arranged between the preheating tank and the percolate separator, a fifth flowmeter used for controlling the output flow of the concentrated solution is arranged between the percolate separator and the concentrated solution collecting box, a sixth flowmeter for regulating the flow of the solvent outlet liquid is arranged on the pipeline between the vapor-liquid separator and the solvent storage tank, and a seventh flowmeter for controlling the flow of the cooling medium in and out of the liquid outlet pipeline of the third circulating pump is arranged on the liquid outlet pipeline of the third circulating pump.
Preferably, the first flowmeter, the second flowmeter, the third flowmeter, the fourth flowmeter, the fifth flowmeter, the sixth flowmeter and the seventh flowmeter are all electrically connected with the control device.
Preferably, when the liquid level height of the percolate in the preheating tank reaches a preset value, the second liquid level sensor transmits a signal to the control device, and the control device controls the third flow meter to stop the inflow of the percolate.
Preferably, when the temperature of the percolate in the preheating tank reaches a preset value, the second temperature sensor transmits a signal to the control device, the control device controls the fourth flowmeter to be started, and the percolate enters the percolate separator to be processed.
Preferably, when the temperature of the percolate in the preheating tank exceeds a preset value, the second temperature sensor transmits a signal to the control device, and the control device adjusts the flow of the waste heat medium in and out of the second heating device through the second flowmeter so as to reduce the temperature of the percolate.
Preferably, the second conductivity sensor tests the conductivity of the percolate in the preheating tank, the second conductivity sensor sends a corresponding signal to the control device, the control device determines the concentration degree to which the percolate in the percolate separator needs to be concentrated according to the customized water recovery rate, and finds out the corresponding conductivity as a preset value according to the concentration degree;
the first conductivity sensor tests the conductivity of the concentrated percolate, when the conductivity value transmitted back to the control device by the first conductivity sensor reaches a preset value, the control device controls the fifth flowmeter to be started, the percolate at the moment is concentrated liquid, and the concentrated liquid is discharged from the concentrated liquid outlet of the percolate separator to the concentrated liquid collecting box to be collected and stored for further processing.
Preferably, when the level of percolate in said percolate separator reaches a preset value, said first level sensor transmits a signal to the control means which controls the fourth flow meter to stop the inflow of percolate.
Preferably, when the temperature of the percolate in the percolate separator exceeds a preset value, the first temperature sensor transmits a signal to the control device, and the control device adjusts the flow rate of the waste heat medium in the first heating device to the outlet liquid through the first flow meter so as to reduce the temperature of the percolate.
Preferably, when the third liquid level sensor detects that the effective height of the liquid water in the gas-liquid separator exceeds a preset value, the third liquid level sensor transmits a signal to the control device, the control device controls the sixth flowmeter to be started, the liquid water is discharged to the solvent storage tank to be stored, and the liquid water can be used as a cooling medium in the circulating tank;
preferably, when the condensing efficiency of the condensing pipe needs to be increased, the control device adjusts the flow of the cooling medium into and out of the liquid through a seventh flow meter.
The invention aims to provide a concentration treatment system for landfill leachate and a concentration treatment method for the landfill leachate aiming at the defects of the prior art and enterprises with suitable waste heat resources.
The invention provides a concentration treatment system and a concentration treatment method for landfill leachate, which have the beneficial effects that:
1. aiming at enterprises with suitable waste heat resources, the leachate is heated by using waste heat, so that the energy consumption is reduced;
2. the boiling point of water is reduced by using a vacuum pump, so that low-grade waste heat resources with the temperature range of 60-70 ℃ can meet the heating requirement, the use threshold of the waste heat resources is reduced, and the availability of the waste heat resources is increased;
3. the characteristic of rapidly transferring water molecules in a thermal state of the infiltration vaporization membrane is utilized, and the infiltration efficiency is increased by matching with waste heat heating;
4. the system has high water production purity (TDS can be as low as 10 mg/L);
5. the system has high water yield which can reach 90%.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Reference numerals: 1. a diafiltrate separator; 101. percolating the vaporization membrane; 102. a steam collecting pipe; 103. a leachate inlet; 104. a concentrated solution outlet; 105. a solvent outlet; 2. a stock solution tank; 201. a liquid inlet; 202. a liquid outlet; 203. a pretreatment layer; 3. a stock solution pump; 4. a preheating box; 5. a waste heat heating pipe; 501. a first waste heat input; 502. a first waste heat output; 503. a first circulation pump; 6. a waste heat preheating pipe; 601. a second waste heat input; 602. a second waste heat output; 603. a second circulation pump; 7. a vacuum pump; 8. a vapor-liquid separator; 9. a solvent storage tank; 10. a third circulation pump; 11. a condenser tube; 111. a first cooling medium input; 112. a first cooling medium output; 113. a solvent entry end; 114. a solvent output end; 12. a circulation box; 121. a second cooling medium input; 122. a second cooling medium output; 123. a cooling medium supplement terminal; 13. a first flow meter; 14. a second flow meter; 15. a third flow meter; 16. a fourth flow meter; 17. a fifth flow meter; 18. a sixth flow meter; 19. a seventh flow meter; 20. and a concentrated solution collecting box.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a concentrated processing system for landfill leachate includes leachate pretreatment device, leachate separator 1, negative pressure device, first heating device, second heating device, monitoring device, wherein: the first heating device heats the percolate in the percolate separator 1; the second heating device preheats the percolate in the percolate pretreatment device; the negative pressure device provides negative pressure for the percolate separator 1; the percolate separator 1 separates solute and water in the percolate inside the percolate under the action of a negative pressure device; the online monitoring device monitors and adjusts parameters such as temperature, conductivity, flow and liquid level height of percolate in the whole concentration processing system.
Leachate preprocessing device includes stoste case 2, stoste pump 3, preheating cabinet 4, stoste case 2, stoste pump 3 and preheating cabinet 4 connect gradually, stoste case 2 is used for collecting the infiltration stoste that produces among the storage refuse treatment process, 2 whole shapes of stoste case are cylindricly, be provided with inlet 201 and liquid outlet 202 on the stoste case 2, be provided with the preprocessing subassembly to leachate preprocessing in the stoste case 2, inlet 201 and liquid outlet 202 are located the preprocessing subassembly both sides respectively.
In a preferred embodiment, the pretreatment module is used for treating leachate by adsorption filtration, and in particular, the pretreatment layer 203 is used for pretreating leachate by a pretreatment layer 203 composed of suspended solids, wherein the size of suspended solid particles in the pretreatment layer 203 is in the range of 10 μm to 20 μm, more preferably, a suspended solid particle layer of 20 μm, and the size of the suspended solid particles is 20 μm from the stock solution tank 2.
The liquid outlet 202 is connected with a liquid inlet pipe of the raw liquid pump 3, percolate entering from a liquid inlet 201 of the raw liquid tank 2 is pretreated by a pretreatment layer 203 and then is conveyed into the preheating tank 4 under the driving of the raw liquid pump 3, the second heating device is arranged on the preheating tank 4, preferably, the second heating device is a waste heat preheating pipe 6, two ends of the waste heat preheating pipe 6 are respectively a second waste heat input end 601 and a second waste heat output end 602, the waste heat preheating pipe 6 is spirally wound on the side wall of the preheating tank 4 and is welded and fixed through an intermittent welding process, heat conduction cement favorable for heat transmission is arranged in a gap between the waste heat preheating pipe 6 and the side wall of the preheating tank 4, waste heat media in the waste heat preheating pipe 6 comprise one or more of boiler blow-off water, steam drainage and steam pumping, the temperature range of the waste heat media is 60-70 ℃, the temperature of the percolate stored in the preheating tank 4 is kept within the desired temperature range by the action of the waste heat medium in the waste heat preheating pipe 6.
The leachate preheated by the waste heat preheating pipe 6 in the preheating tank 4 is driven by a raw liquid pump 3 to be conveyed to a leachate separator 1, a leachate vaporization membrane 101 and a steam collection pipe 102 are arranged in the leachate separator 1, one end of the steam collection pipe 102 is connected with the open end of the leachate vaporization membrane 101, the leachate vaporization membrane 101 is in a cylindrical shape with one open end, one end of the steam collection pipe 102 is hermetically connected with the open end of the leachate vaporization membrane 101, the other end of the steam collection pipe is connected with a solvent outlet 105, a fluid channel is formed in an area between the leachate vaporization membrane 101 and the inner wall of the leachate separator 1, a leachate inlet 103 and a concentrated solution outlet 104 are both communicated with the fluid channel, and the leachate vaporization membrane 101 is in a nano-scale membrane structure provided with selective permeability water molecule.
The percolate separator 1 is provided with a percolate inlet 103, a concentrated solution outlet 104 and a solvent outlet 105, the percolate separator 1 is connected with the preheating tank 4 through the percolate inlet 103, the percolate separator 1 is connected with the concentrated solution collecting tank 27 through the concentrated solution outlet 104, the percolate separator 1 is connected with a negative pressure device through the solvent outlet 105, the percolate inlet 103 and the concentrated solution outlet 104 are respectively positioned at the same side of the percolate vaporization membrane 101, one end of the steam collecting pipe 102 far away from the percolate vaporization membrane 101 is connected with the solvent outlet 105, under the action of the negative pressure device, the pressure at the side of the percolate vaporization membrane 101 close to the solvent outlet 105 is lower than the pressure at the side of the percolate vaporization membrane 101 close to the percolate inlet 103, in a preferred embodiment, the number of the percolate vaporization membranes 101 is multiple, and the number of the steam collecting pipes 102 is the same as that of the percolate vaporization membranes 101, the ends of the collection tubes remote from the diafiltration vaporization membrane 101 are each connected to a solvent outlet 105.
The first heating device is arranged at the bottom of the percolation liquid separator 1, the first heating device is provided with a first waste heat input end 501 for inputting waste heat media and a first waste heat output end 502 for outputting the waste heat media, preferably, the first heating device is a waste heat heating pipe 5, the waste heat heating pipe 5 is fixed at the bottom of the percolation liquid separator 1 through discontinuous welding process welding coiling, heat-conducting daub is arranged in a gap between the waste heat heating pipe 5 and the bottom of the percolation liquid separator 1, and the waste heat media in the waste heat heating pipe 5 comprise one or more of boiler sewage, steam drainage and steam extraction.
In a preferred embodiment, the diafiltration vaporization membrane 101 is based on butadiene-styrene copolymer, and part of the aromatic rings are sulfonated and cross-linked by sulfonation reaction to form a nanoscale membrane structure with selective permeability water molecule channels, the diafiltration vaporization membrane 101 has the characteristic of rapidly transferring water molecules in a thermodynamic state, and under the heating of the first heating device, the percolate at the side of the diafiltration vaporization membrane 101 close to the percolate inlet 103 is accelerated to flow, and water molecules are accelerated to pass through the water molecule channels to the side of the diafiltration vaporization membrane 101 close to the vapor collection pipe 102; the negative pressure device applies negative pressure to the solvent outlet 105 side of the percolation vaporization membrane 101, the boiling point of water is reduced under the negative pressure state, and the water can be changed into water vapor at a lower temperature to enter the vapor collection pipe 102 under the heating of the first heating device, so that the use threshold of waste heat resources is reduced, and in a preferred embodiment, the temperature range provided by the waste heat medium in the waste heat heating pipe 5 is 60-70 ℃.
A first waste heat input end 501 of the waste heat heating pipe 5 is connected with a first circulating pump 503, a waste heat medium flows in from the first waste heat input end 501 under the driving of the first circulating pump 503 and flows out from a first waste heat output end 502, and the waste heat heating pipe 5 is used for circulating heat tracing of percolate in the percolate separator 1; the second waste heat input end 601 of the waste heat preheating pipe 6 is connected with the second circulating pump 603, a waste heat medium flows in from the second waste heat input end 601 and flows out from the second waste heat output end 602 under the driving of the second circulating pump 603, and the waste heat preheating pipe 6 is used for circularly preheating percolate in the preheating tank 4.
The negative pressure device comprises a vacuum pump 7, a condensing device, a vapor-liquid separator 8 and a solvent storage tank 9, the vapor-liquid separator 8 is respectively connected with a condensing device, a vacuum pump 7 and a solvent storage tank 9, the condensing device is also connected with a solvent outlet 105 of the percolation liquid separator 1, the vacuum pump 7 supplies a negative pressure to the diafiltration vaporization membrane 101 on the side close to the solvent outlet 105 in the diafiltration liquid separator 1 through the vapor-liquid separator 8 and the condensing means in sequence, driven by the vacuum pump 7, the air containing water vapor enters the condensing device from the solvent outlet 105 for cooling treatment and then enters the vapor-liquid separator 8, the gas-liquid separator 8 is used for carrying out dry-wet separation on air, water vapor is condensed into liquid water in the gas-liquid separator and is finally discharged into the solvent storage tank 9 for storage, in a preferred embodiment, the liquid water stored in the solvent storage tank 9 has a high purity characteristic (TDS can be as low as 10 mg/L).
The condensing device comprises a condensing pipe 11, a third circulating pump 10 and a circulating tank 12, wherein a first cooling medium input end 111, a first cooling medium output end 112, a solvent inlet end 113 and a solvent output end 114 are arranged on the condensing pipe 11, the solvent inlet end 113 is connected with a solvent outlet 105, the solvent output end 114 is connected with a vapor-liquid separator 8, a second cooling medium input end 121, a second cooling medium output end 122 and a cooling medium supplement end 123 are arranged on the circulating tank 12, the first cooling medium input end 111 is connected with the second cooling medium output end 122 through the third circulating pump 10, and the first cooling medium output end 112 is connected with the second cooling medium input end 121.
The cooling medium in the circulation tank 12 is driven by the third circulation pump 10 to flow in a circulating manner through the second cooling medium output end 122, the third circulation pump 10, the first cooling medium input end 111, the condensation pipe 11, the second cooling medium output end 122, the second cooling medium input end 121 and the circulation tank 12 in sequence, the cooling medium cools the air containing water vapor in the condensation pipe 11, and preferably, the cooling medium includes, but is not limited to, one or more of pure water, tap water and water stored in the solvent storage tank 9.
A first flowmeter 13 for regulating the flow of the waste heat medium in and out is arranged on the first waste heat input end 501 or the first waste heat output end 502, the first waste heat input end 501 or the first waste heat output end 502 is provided with a second flowmeter 14 for regulating the flow of the waste heat medium in and out, a third flow meter 15 for controlling the feed liquor flow of the percolate is arranged between the stock pump 3 and the preheating tank 4, a fourth flowmeter 16 for controlling the output flow of percolate is arranged between the preheating tank 4 and the percolate separator 1, a fifth flowmeter 17 for controlling the output flow of the concentrated liquid is arranged between the percolate separator 1 and the concentrated liquid collecting tank 27, a sixth flowmeter 18 for regulating the flow of the solvent outlet liquid is arranged on the pipeline between the vapor-liquid separator 8 and the solvent storage tank 9, and a seventh flowmeter 19 for controlling the flow of the cooling medium entering and exiting the liquid is arranged on the liquid outlet pipeline of the third circulating pump 10.
The monitoring device comprises a control device, a first liquid level sensor, a first conductivity sensor, a first temperature sensor, a second liquid level sensor, a second conductivity sensor, a second temperature sensor and a third liquid level sensor, wherein the first liquid level sensor, the first conductivity sensor and the first temperature sensor are arranged on the percolation liquid separator 1 and are respectively used for monitoring the temperature, the conductivity, the flow and the liquid level height parameters of percolation liquid in the percolation liquid separator 1, the second liquid level sensor, the second conductivity sensor and the second temperature sensor are arranged on the preheating tank 4 and are respectively used for monitoring the temperature, the conductivity, the flow and the liquid level height parameters of the percolation liquid in the preheating tank 4, and the third liquid level sensor is arranged on the vapor-liquid separator 8 and is used for detecting the liquid level height of condensate water in the vapor-liquid separator 8.
The control device is respectively electrically connected with the first liquid level sensor, the first conductivity sensor, the first temperature sensor, the second liquid level sensor, the second conductivity sensor, the second temperature sensor, the third liquid level sensor, the first flowmeter 13, the second flowmeter 14, the third flowmeter 15, the fourth flowmeter 16, the fifth flowmeter 17, the sixth flowmeter 18 and the seventh flowmeter 19, preferably, the control device comprises one of a console and an upper computer.
In a preferred embodiment, the control device is a console, when the liquid level of the percolate in the preheating tank 4 reaches a preset value, the second liquid level sensor transmits a signal to the console, the console controls the third flow meter 15 to stop the inflow of the percolate, when the temperature of the percolate in the preheating tank 4 reaches a preset value, the second temperature sensor transmits a signal to the console, the console controls the fourth flow meter 16 to be started, and the percolate enters the percolate separator 1 for treatment; when the temperature of the percolate in the preheating box 4 exceeds a preset value, the second temperature sensor transmits a signal to the control console, and the control console adjusts the flow of the waste heat medium in and out of the waste heat preheating pipe 6 through a second flowmeter 14 so as to reduce the temperature of the percolate.
The second conductivity sensor tests the conductivity of the percolate in the preheating tank 4, sends a corresponding signal to the control console, and the control console determines the concentration degree to which the percolate in the percolate separator 1 needs to be concentrated according to the self-defined water recovery rate and finds out the corresponding conductivity as a preset value according to the concentration degree; the first conductivity sensor tests the conductivity of the concentrated leachate, when the conductivity value transmitted back to the console by the first conductivity sensor reaches a preset value, the console controls the fifth flowmeter 17 to be opened, the leachate at this time is concentrated solution, and the concentrated solution is discharged from the concentrated solution outlet 104 of the leachate separator 1 to the concentrated solution collecting box 20 to be collected and stored for further processing.
When the liquid level height of the percolate in the percolate separator 1 reaches a preset value, the first liquid level sensor transmits a signal to a control console, and the control console controls a fourth flowmeter 16 to stop the inflow of the percolate; when the temperature of the percolate in the percolate separator 1 exceeds a preset value, the first temperature sensor transmits a signal to a control console, and the control console adjusts the flow of the waste heat medium in and out of the waste heat heating pipe 5 through a first flow meter 13 so as to reduce the temperature of the percolate; when the third level sensor detects that the effective level of liquid water in the vapor-liquid separator 8 exceeds a predetermined value, the third level sensor transmits a signal to the console, which controls the sixth flow meter 18 to be turned on, and the liquid water is discharged to the solvent storage tank 9 for storage, and the liquid water can be used as a cooling medium in the circulation tank 12.
When the condensing efficiency of the condensing pipe 11 needs to be increased, the control console adjusts the flow of the cooling medium entering and exiting the liquid through a seventh flowmeter 19.
In conclusion, the invention has the beneficial effects that:
aiming at enterprises with suitable waste heat resources, the leachate is heated by using waste heat, so that the energy consumption is reduced; the boiling point of water is reduced by using the vacuum pump 7, so that low-grade waste heat resources with the temperature range of 60-70 ℃ can meet the heating requirement, the use threshold of the waste heat resources is reduced, and the availability of the waste heat resources is increased; the characteristic that water molecules are rapidly transferred under the thermodynamic state of the percolation vaporization membrane 101 is utilized, and the percolation efficiency is increased by matching with waste heat heating; the pretreatment is simple, and only 20-micron suspended solids are needed for filtration, so that the pretreatment requirement is greatly reduced; the recovery rate of high yield water can reach 90 percent; diafiltration produced water of high purity (TDS can be as low as 10 mg/L).
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (10)
1. A concentration treatment system for landfill leachate is characterized by comprising a stock solution tank, a stock solution pump, a leachate separator, a first heating device, a negative pressure device and a concentrated solution collecting box, wherein the stock solution tank, the stock solution pump and the leachate separator are sequentially connected from upstream to downstream;
the percolation liquid separator is provided with a percolation liquid inlet, a concentrated liquid outlet and a solvent outlet, a percolation vaporization membrane and a steam collecting pipe are arranged in the percolation liquid separator, the percolation vaporization membrane is in a cylindrical shape with one open end, one end of the steam collecting pipe is hermetically connected with the open end of the percolation vaporization membrane, the other end of the steam collecting pipe is connected with the solvent outlet, a fluid channel is formed in an area between the percolation vaporization membrane and the inner wall of the percolation liquid separator, and the percolation liquid inlet and the concentrated liquid outlet are both communicated with the fluid channel;
the percolation vaporization membrane is a nano-scale membrane structure provided with a selective permeability water molecule channel;
the percolate separator is connected with the raw liquid pump through a percolate inlet, is connected with the concentrated liquid collecting box through a concentrated liquid outlet, and is connected with the negative pressure device through a solvent outlet;
the first heating device is arranged on the percolation liquid separator, a first waste heat input end used for inputting waste heat media and a first waste heat output end used for outputting the waste heat media are arranged on the first heating device, and a first circulating pump is arranged on the first waste heat input end or the first waste heat output end.
2. The concentration treatment system for landfill leachate according to claim 1, wherein a preheating tank is disposed between the raw liquid pump and the leachate separator, the preheating tank is connected to the raw water pump and the leachate inlet of the leachate separator, a second heating device for providing heat by using waste heat resources is disposed on the preheating tank, a second waste heat input end for inputting waste heat medium and a second waste heat output end for outputting waste heat medium are disposed on the second heating device, and a second circulating pump is disposed on the second waste heat input end or the second waste heat output end.
3. The concentration treatment system for landfill leachate according to claim 2, wherein the leachate separator is provided with a first liquid level sensor, a first conductivity sensor and a first temperature sensor, the preheating tank is provided with a second liquid level sensor, a second conductivity sensor and a second temperature sensor, and the first liquid level sensor, the first conductivity sensor, the first temperature sensor, the second liquid level sensor, the second conductivity sensor and the second temperature sensor are all connected with the control device.
4. The concentration treatment system for landfill leachate according to claim 3, wherein a first flow meter is disposed on the first waste heat input end or the first waste heat output end, a second flow meter for adjusting the flow rate of inlet and outlet of waste heat medium is disposed on the first waste heat input end or the first waste heat output end, a third flow meter for controlling the inlet flow rate of leachate is disposed between the raw liquid pump and the preheating tank, a fourth flow meter for controlling the outlet flow rate of leachate is disposed between the preheating tank and the leachate separator, a fifth flow meter for controlling the outlet flow rate of concentrate is disposed between the leachate separator and the concentrate collecting tank, and the first flow meter, the second flow meter, the third flow meter, the fourth flow meter and the fifth flow meter are all connected to the control device.
5. The concentration treatment system for landfill leachate according to claim 1, wherein the raw liquid tank is provided with a liquid inlet and a liquid outlet, the raw liquid tank is provided with a pretreatment module for separating impurities in the leachate, the liquid inlet and the liquid outlet are respectively located at two sides of the pretreatment module, and the liquid outlet is connected to the raw liquid pump.
6. The concentration treatment system for landfill leachate according to claim 1, wherein the negative pressure device comprises a vacuum pump, a condensing device, a vapor-liquid separator and a solvent storage tank, the vapor-liquid separator is connected with the condensing device, the vacuum pump and the solvent storage tank respectively, and the condensing device is further connected with a solvent outlet of the leachate-liquid separator;
the condensing device comprises a condensing pipe, a third circulating pump and a circulating tank;
the condenser pipe is provided with a first cooling medium input end, a first cooling medium output end, a solvent inlet end and a solvent output end, the solvent inlet end is connected with a solvent outlet, and the solvent output end is connected with a vapor-liquid separator; the circulating box is provided with a second cooling medium input end, a second cooling medium output end and a cooling medium supplement end; the first cooling medium input end is connected with the second cooling medium output end through a third circulating pump, and the first cooling medium output end is connected with the second cooling medium input end.
7. A concentration treatment method for landfill leachate, which is applied to the concentration treatment system of claim 1, the concentration treatment method comprising:
waste heat medium in the first heating device flows in from a first waste heat input end and flows out from a first waste heat output end under the driving of a first circulating pump, the waste heat medium heats percolate in a percolate separator through the first heating device, water molecules in the percolate positioned on one side of the percolate vaporization membrane close to a percolate inlet flow in an accelerated mode, and the water molecules penetrate through a water molecule channel from the outer side of the percolate vaporization membrane in an accelerated mode to reach a cavity of the cylindrical percolate vaporization membrane;
the negative pressure device applies negative pressure to the cavity of the percolation vaporization membrane, and the boiling point of water is reduced under the negative pressure state to form water vapor which is discharged from the vapor collecting pipe;
when at least a portion of the water in the leachate is removed, the remaining solutes and solvent form a concentrate which is discharged from the concentrate outlet to a concentrate collection tank for subsequent treatment.
8. The method according to claim 7, wherein a preheating tank is arranged between the raw liquid pump and the percolate separator, the preheating tank is respectively connected with the raw water pump and the percolate inlet of the percolate separator, a second heating device for providing heat by using waste heat resources is arranged on the preheating tank, a second waste heat input end for inputting waste heat media and a second waste heat output end for outputting waste heat media are arranged on the second heating device, and a second circulating pump is arranged on the second waste heat input end or the second waste heat output end;
the raw liquid pump firstly conveys the percolate from the raw liquid tank to the preheating tank, waste heat media in the second heating device flow in from the second waste heat input end and flow out from the second waste heat output end under the driving of the second circulating pump, the waste heat media preheat the percolate through the second heating device, and the preheated percolate enters the percolate liquid separator.
9. The method of claim 8, wherein the leachate separator is provided with a first liquid level sensor, a first conductivity sensor and a first temperature sensor, the preheating tank is provided with a second liquid level sensor, a second conductivity sensor and a second temperature sensor, and the first liquid level sensor, the first conductivity sensor, the first temperature sensor, the second liquid level sensor, the second conductivity sensor and the second temperature sensor are all connected with a control device;
a first flowmeter is arranged on the first waste heat input end or the first waste heat output end, a second flowmeter is arranged on the first waste heat input end or the first waste heat output end, a third flowmeter is arranged between the raw liquid pump and the preheating tank, a fourth flowmeter is arranged between the preheating tank and the percolate separator, a fifth flowmeter is arranged between the percolate separator and the concentrated solution collecting tank, and the first flowmeter, the second flowmeter, the third flowmeter, the fourth flowmeter and the fifth flowmeter are all connected with the control device;
when the liquid level height of the percolate in the preheating tank reaches a preset value, the second liquid level sensor transmits a signal to the control device, and the control device controls the third flow meter to stop the inflow of the percolate;
when the temperature of the percolate in the preheating tank reaches a preset value, the second temperature sensor transmits a signal to the control device, the control device controls the fourth flowmeter to be started, and the percolate enters the percolate separator for treatment;
when the temperature of the percolate in the preheating tank exceeds a preset value, the second temperature sensor transmits a signal to the control device, and the control device adjusts the flow of the waste heat medium in and out of the second heating device through a second flowmeter so as to reduce the temperature of the percolate;
the second conductivity sensor is used for testing the conductivity of the percolate in the preheating tank and sending a corresponding signal to the control device, the control device determines the concentration degree to be reached by the percolate in the percolate separator according to the self-defined water recovery rate and finds out the corresponding conductivity as a preset value according to the concentration degree;
the first conductivity sensor tests the conductivity of the concentrated percolate, when the conductivity value transmitted back to the control device by the first conductivity sensor reaches a preset value, the control device controls the fifth flowmeter to be started, the percolate at the moment is concentrated solution, and the concentrated solution is discharged from a concentrated solution outlet of the percolate separator to a concentrated solution collecting box to be collected and stored for further processing;
when the liquid level height of the percolate in the percolate liquid separator reaches a preset value, the first liquid level sensor transmits a signal to the control device, and the control device controls the fourth flowmeter to stop the inflow of the percolate;
when the temperature of the percolate in the percolate liquid separator exceeds a preset value, the first temperature sensor transmits a signal to the control device, and the control device adjusts the flow of the waste heat medium in and out of the first heating device through the first flow meter so as to reduce the temperature of the percolate.
10. The method according to claim 7, wherein the raw solution tank is provided with a liquid inlet and a liquid outlet, the raw solution tank is provided with a pretreatment module for separating impurities in the leachate, the liquid inlet and the liquid outlet are respectively located at two sides of the pretreatment module, and the liquid outlet is connected to the raw solution pump;
the percolate entering from the liquid inlet of the stock solution tank is pretreated by a pretreatment layer and then is conveyed into a preheating tank under the driving of a stock solution pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747640.4A CN111732260A (en) | 2020-07-30 | 2020-07-30 | Concentration treatment system and concentration treatment method for landfill leachate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010747640.4A CN111732260A (en) | 2020-07-30 | 2020-07-30 | Concentration treatment system and concentration treatment method for landfill leachate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111732260A true CN111732260A (en) | 2020-10-02 |
Family
ID=72656527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010747640.4A Pending CN111732260A (en) | 2020-07-30 | 2020-07-30 | Concentration treatment system and concentration treatment method for landfill leachate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111732260A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114380445A (en) * | 2022-01-13 | 2022-04-22 | 河南省三门峡水文水资源勘测局 | Landfill leachate treatment facility |
| CN114713034A (en) * | 2022-02-28 | 2022-07-08 | 中国计量大学 | Rapid temperature compensation pervaporation concentration high-salinity wastewater device |
-
2020
- 2020-07-30 CN CN202010747640.4A patent/CN111732260A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114380445A (en) * | 2022-01-13 | 2022-04-22 | 河南省三门峡水文水资源勘测局 | Landfill leachate treatment facility |
| CN114713034A (en) * | 2022-02-28 | 2022-07-08 | 中国计量大学 | Rapid temperature compensation pervaporation concentration high-salinity wastewater device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101602216B1 (en) | Stacked type vertical tube falling film evaporator, zero liquid discharging equipment comprising the same, and zero liquid discharging method using the same | |
| US9328601B2 (en) | System and method for enhanced recovery of oil from an oil field | |
| CN107614440B (en) | Method and apparatus for advanced vacuum membrane distillation | |
| US20150232348A1 (en) | Water desalination and brine volume reduction process | |
| CN101879380B (en) | Energy-saving concentration process for extracting active ingredients of plants and concentration device thereof | |
| CN111732260A (en) | Concentration treatment system and concentration treatment method for landfill leachate | |
| KR101769949B1 (en) | Evaporation and concentration system and method having improved energy efficiency | |
| CN111655628A (en) | Waste water treatment method | |
| US11465924B2 (en) | Hybrid process and system for recovering water | |
| EP0623041A4 (en) | Evaporative concentration of clay slurries. | |
| CN114772671A (en) | Two-stage MVR single-effect forced circulation evaporation production device and method for salt-containing wastewater | |
| AU2018355018B2 (en) | Membrane water treatment system and method thereof | |
| CN212713114U (en) | A concentrated processing system for landfill leachate | |
| CN101874984A (en) | Device and method for distilling air-blowing vacuum membrane | |
| CN111111451B (en) | Reduced pressure multi-effect membrane distillation method and device thereof | |
| WO2018045709A1 (en) | Power plant seawater desalination treatment device and method | |
| JPH11267644A (en) | Water treating apparatus | |
| RU2671746C1 (en) | Method for removing dissolved gas from feed stream of evaporator | |
| CN210764427U (en) | Pure water preparation system of membrane distillation | |
| CN107162308B (en) | Membrane distillation evaporation crystallization process and system | |
| CN105692739A (en) | System for treating wastewater containing salt and method using system to treat wastewater containing salt | |
| CN105417609A (en) | Method for adjusting dissolved gases in boiler feed water | |
| KR20160006914A (en) | Hybrid desalination system and method | |
| CN110342599A (en) | A kind of membrane distillation purified water preparation system | |
| CN105036221B (en) | Zero-release recycling treatment system and method for distilled water formed by evaporating and crystallizing coking wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |