CN112939364A - Landfill leachate concentrated solution treatment system and treatment process - Google Patents
Landfill leachate concentrated solution treatment system and treatment process Download PDFInfo
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- 239000000149 chemical water pollutant Substances 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000008569 process Effects 0.000 title claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000010802 sludge Substances 0.000 claims abstract description 48
- 238000001704 evaporation Methods 0.000 claims abstract description 34
- 239000012452 mother liquor Substances 0.000 claims abstract description 31
- 230000008020 evaporation Effects 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000002562 thickening agent Substances 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 21
- 230000003647 oxidation Effects 0.000 claims abstract description 19
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 19
- 239000013078 crystal Substances 0.000 claims abstract description 17
- 238000002425 crystallisation Methods 0.000 claims abstract description 13
- 230000008025 crystallization Effects 0.000 claims abstract description 13
- 238000010992 reflux Methods 0.000 claims abstract description 11
- 230000001590 oxidative effect Effects 0.000 claims abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 239000006228 supernatant Substances 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 230000009471 action Effects 0.000 claims description 20
- 239000012141 concentrate Substances 0.000 claims description 19
- 238000004062 sedimentation Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 230000005514 two-phase flow Effects 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 239000000945 filler Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 239000007791 liquid phase Substances 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 230000008719 thickening Effects 0.000 claims description 5
- 230000003750 conditioning effect Effects 0.000 claims 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 4
- 231100000719 pollutant Toxicity 0.000 abstract description 4
- 238000004065 wastewater treatment Methods 0.000 abstract description 2
- 238000009833 condensation Methods 0.000 description 15
- 230000005494 condensation Effects 0.000 description 15
- 230000001105 regulatory effect Effects 0.000 description 10
- 239000007789 gas Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 238000005119 centrifugation Methods 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- 239000000356 contaminant Substances 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 238000001728 nano-filtration Methods 0.000 description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002351 wastewater Substances 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
-
- 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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention belongs to the field of wastewater treatment, and particularly relates to a landfill leachate concentrated solution treatment system and a treatment process, wherein the landfill leachate concentrated solution treatment system comprises a mother liquor tank, a subcritical oxidation system, an MVR evaporation crystallization system and a two-stage A/O system; the treatment process comprises the following steps: s1, pressurizing the landfill leachate concentrated solution by a high-pressure pump, feeding the landfill leachate concentrated solution into a heat-conducting oil heat exchanger, heating the landfill leachate concentrated solution, feeding the landfill leachate concentrated solution into a reaction system for reaction, cooling the landfill leachate, feeding the landfill leachate into a gas-liquid separator for flash evaporation, emptying the tail gas after the flash evaporation, and feeding the oxidation solution into subsequent treatment; s2, adding the preheated oxidizing solution from the top of the MVR evaporator, conveying the preheated oxidizing solution into a thickener through a discharge pump after crystals grow, refluxing supernatant into a mother liquor tank from an overflow tank, collecting evaporation condensate of the MVR evaporator into a condensate water tank, and conveying the condensate water tank by a condensate water pump; the invention can make the effluent reach the discharge standard, reduce the pollutant concentration of the refuse landfill and reduce the sludge treatment cost and the equipment investment cost.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a landfill leachate concentrated solution treatment system and a treatment process.
Background
When the refuse landfill and the refuse incineration plant are built, corresponding refuse leachate treatment facilities are required to be built. In 2008, the pollution control standard of the domestic garbage landfill (GB 16889-2008) stipulates that the existing and newly-built domestic garbage landfill should have perfect garbage leachate treatment facilities and the improvement period is 3 years. Therefore, the unlimited potential of the market and the severity of the discharge standard have led to an increasingly significant importance in the treatment of landfill leachate. The landfill leachate is used as high-concentration and high-salt organic wastewater, the treatment difficulty is high, a Membrane Bioreactor (MBR), Nanofiltration (NF) and Reverse Osmosis (RO) process is mostly adopted for domestic treatment modes of the landfill leachate, and the process can generate concentrated solution with the treatment capacity of about 20-25% on the premise of ensuring that the effluent reaches the standard. The concentrated solution contains high-concentration refractory macromolecular organic matters, high-concentration ammonia nitrogen and high-concentration salt. The most common method for treating the concentrated solution at present is a landfill recharging method, namely, the concentrated solution enters a landfill system again through a recharging system.
The recharging process has many disadvantages, such as increasing the concentration of the contaminants, and the accumulation of salts and non-degradable contaminants in the concentrate, which leads to the increase of the osmotic pressure of the reverse osmosis system, and the failure of the concentrate system due to the severe membrane fouling, and thus, the treatment process of the landfill leachate concentrate needs to be further improved.
Disclosure of Invention
The invention aims to solve the defects that the concentration of pollutants is increased by a recharging process, salt and difficultly-degradable pollutants in a concentrated solution are accumulated continuously, the osmotic pressure of a reverse osmosis system is increased, and the concentrated solution system is paralyzed due to severe membrane scaling in the prior art, and provides a landfill leachate concentrated solution treatment system and a treatment process.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a landfill leachate concentrate processing system, is including the mother liquor jar, subcritical oxidation system, MVR evaporation crystallization system, two-stage AO system, feed proportioning system, filter, surge tank and the equalizing basin elevator pump that connect gradually, subcritical oxidation system includes high-pressure pump, heater, reactor, cooler, vapour and liquid separator, the input of high-pressure pump with the mother liquor jar is connected, the output of high-pressure pump with the input of heater is connected, the output of heater with the input of reactor is connected, the output of reactor with the input of cooler is connected, the input of cooler with vapour and liquid separator's input is connected.
Preferably, the output end of the batching system is connected with the input end of the filter, and the output end of the filter is connected with the input end of the high-pressure pump.
Preferably, the heater is a heat-conducting oil heat exchanger, and the landfill leachate concentrated solution is heated to the temperature of 200-270 ℃ by heat-conducting oil in the heat-conducting oil heat exchanger and then enters the reactor for reaction.
Preferably, the MVR evaporative crystallization system comprises an MVR evaporator, a discharge pump, a thickener, a condensed water tank, a condensed water pump and a centrifuge, wherein the input end of the MVR evaporator is arranged at the top of the MVR evaporator, the input end of the MVR evaporator is connected with the liquid phase output end of the gas-liquid separator, the magma output end of the MVR evaporator is connected with the input end of the discharge pump, the output end of the discharge pump is connected with the input end of the thickener, the overflow groove of the thickener is connected with the mother liquid tank, the evaporated condensed liquid output end of the MVR evaporator is connected with the input end of the condensed water tank, the output end of the condensed water tank is connected with the input end of the condensed water pump, and the magma output end of the thickener is connected with the input end of the centrifuge.
Preferably, the input end of the regulating tank is connected with the output end of the condensate pump, the output end of the regulating tank is connected with the input end of the regulating pool lift pump, and the output end of the regulating pool lift pump is connected with the two-stage A/O system.
Preferably, the secondary sedimentation tank of the two-stage A/O system is connected with a discharge pump and a sludge screw pump, the output end of the sludge screw pump is connected with the mother liquor tank, and the rest sludge of the two-stage A/O system flows back to the mother liquor tank through the sludge pump.
The invention also provides a landfill leachate concentrated solution treatment process, which comprises the following steps:
s1, conveying the landfill leachate concentrated solution to a filter after caching and homogenizing in a batching system, removing solid impurities in the filter, pressurizing the landfill leachate concentrated solution by a high-pressure pump until the pressure reaches 2-7.5MPa, introducing the landfill leachate concentrated solution into a heat-conducting oil heat exchanger after pressurizing, heating the landfill leachate to the temperature of 200 ℃ by heat-conducting oil in the heat-conducting oil heat exchanger, introducing the landfill leachate into a reaction system for reaction, wherein the temperature of a gas-liquid two-phase flow after reaction is higher, introducing the landfill leachate into a gas-liquid separator for flash evaporation after cooling by circulating water in a cooler, emptying tail gas after flash evaporation, and introducing;
s2, adding an oxidizing solution from the top of an MVR evaporator after preheating, allowing the oxidizing solution to flow down along the tube wall in a film state under the action of gravity, continuously evaporating a solvent in the process to thicken a solute, conveying crystals to the thickener through a discharge pump after the crystals grow, continuously thickening until the solid content is 50-70%, returning supernatant to a mother liquor tank from an overflow tank, allowing crystal slurry to enter a centrifuge for centrifugal separation, collecting evaporation condensate of the MVR evaporator into a condensate water tank, and conveying the condensate water tank by a condensate water pump;
s3, discharging the evaporated condensate after heat exchange and temperature reduction to an adjusting tank, adjusting the pH value to 7-9 in the adjusting tank, entering a two-stage A/O system under the lifting action of an adjusting tank lifting pump, wherein the two-stage A/O system is self-flowing, the effluent of a secondary sedimentation tank of the two-stage A/O system is discharged after reaching the standard under the action of a discharge pump, the residual sludge is refluxed to a subcritical oxidation system under the action of a sludge screw pump, and the rest sludge is refluxed by a sludge pump.
Preferably, in S3, the reflux ratio of the primary aerobic tank and the secondary aerobic tank of the two-stage a/O system is 200%, the reflux ratio of the sludge is 100%, and 25% to 35% of the filler for increasing the volume load is added into the aerobic tanks of the two-stage a/O system.
Preferably, centrifuge includes the shell, is equipped with centrifugal net bucket in the shell, and fixed mounting has a fixing base on the bottom inner wall of shell, and the rectangular channel has been seted up at the top of fixing base, and slidable mounting has a rectangular seat in the rectangular channel, and the rotation groove has been seted up at the top of rectangular seat, rotates the inslot internal rotation and installs the rotation post, rotates the top of post and the bottom fixed connection of centrifugal net bucket, rotates inslot fixed mounting and has the motor, the output shaft of motor and the bottom fixed connection who rotates the post.
Preferably, fixed mounting has the one end of spring on the bottom inner wall of rectangular channel, the other end of spring and the bottom fixed connection of rectangular seat, the bottom fixed mounting of rectangular seat has first conducting block, fixed mounting has the second conducting block on the bottom inner wall of rectangular channel, the outside fixed mounting of shell has power and pilot lamp, first conducting block, a power supply, pilot lamp and second conducting block electric connection in proper order, the fixed cover in the outside of centrifugal net bucket is equipped with the annular slab, the outside of annular slab is equipped with the inclined plane, two reset grooves have been seted up to the inner wall of shell, equal slidable mounting has the trapezoidal piece in two reset grooves, the bottom of two trapezoidal pieces all contacts with the top of annular slab, the equal fixed mounting in one side of two trapezoidal pieces has the one end of pressure spring, the other end of pressure spring and the one side inner wall fixed connection in reset groove.
Compared with the prior art, the invention has the beneficial effects that:
(1) the concentrated solution of the landfill leachate is treated by a subcritical oxidation system, an MVR evaporation crystallization system and a two-stage A/O system, and the effluent effect can reach the three-stage discharge standard of the pollution control standard of a domestic garbage landfill (GB 16889-2008);
(2) the MVR evaporative crystallization system can separate out partial industrial salt products;
(3) the process of the invention has no concentrated solution recharging phenomenon, and reduces the pollutant concentration of the refuse landfill;
(4) the two-stage A/O excess sludge does not have the outward discharge phenomenon and directly flows back to the subcritical oxidation system, thereby reducing the sludge treatment cost and the equipment investment cost.
Drawings
FIG. 1 is a schematic diagram of a landfill leachate concentrate treatment system according to the present invention;
FIG. 2 is a schematic structural diagram of a centrifuge of a landfill leachate concentrate treatment process according to the present invention;
FIG. 3 is a schematic diagram of portion A of FIG. 2 illustrating a landfill leachate concentrate treatment process in accordance with the present invention;
fig. 4 is a schematic structural diagram of part B of fig. 2 of a landfill leachate concentrate treatment process according to the present invention.
In the figure: the centrifugal screen drum comprises a shell 1, a centrifugal screen drum 2, a rotating groove 3, a fixing seat 4, a rectangular seat 5, a rotating column 6, a motor 7, a spring 8, a first conductive block 9, a second conductive block 10, an indicator lamp 11, a ring-shaped plate 12, a resetting groove 13, a trapezoidal block 14 and a pressure spring 15.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example one
Referring to fig. 1-4, a landfill leachate concentrate treatment system comprises a mother liquor tank, a subcritical oxidation system, an MVR evaporative crystallization system, a two-stage A/O system, a batching system, a filter, a regulating tank and a regulating tank lift pump which are sequentially connected, wherein the subcritical oxidation system comprises a high-pressure pump, a heater, a reactor, a cooler and a gas-liquid separator, the input end of the high-pressure pump is connected with the mother liquor tank, the output end of the high-pressure pump is connected with the input end of the heater, the output end of the heater is connected with the input end of the reactor, the output end of the reactor is connected with the input end of the cooler, and the input end of the cooler is connected with the input end of the gas.
In this embodiment, the output of feed proportioning system is connected with the input of filter, and the output of filter is connected with the input of high-pressure pump.
In the embodiment, the heater is a heat-conducting oil heat exchanger, and the garbage leachate concentrated solution is heated to 200 ℃ by heat-conducting oil in the heat-conducting oil heat exchanger and then enters the reactor for reaction.
In this embodiment, MVR evaporation crystallization system includes the MVR evaporimeter, the discharge pump, the thickener, the condensation water pitcher, the condensation water pump, centrifuge, the input setting of MVR evaporimeter is at the top of MVR evaporimeter, the input of MVR evaporimeter is connected with vapour and liquid separator's liquid phase output, the magma output of MVR evaporimeter is connected with the input of discharge pump, the output of discharge pump is connected with the input of thickener, the overflow launder and the mother liquor jar of thickener are connected, the evaporation condensate output of MVR evaporimeter is connected with the input of condensation water pitcher, the output of condensation water pitcher is connected with the input of condensation water pump, the magma output centrifuge's of thickener input is connected.
In this embodiment, the input of surge tank is connected with the output of condensate pump, and the output of surge tank is connected with the input of equalizing basin elevator pump, and the output of equalizing basin elevator pump is connected with two-stage A/O system.
In the embodiment, the secondary sedimentation tank of the two-stage A/O system is connected with a discharge pump and a sludge screw pump, the output end of the sludge screw pump is connected with the mother liquor tank, and the rest sludge of the two-stage A/O system flows back to the mother liquor tank through the sludge pump.
The embodiment also provides a landfill leachate concentrated solution treatment process, which comprises the following steps:
s1, conveying the landfill leachate concentrated solution to a filter after caching and homogenizing in a batching system, removing solid impurities in the filter, pressurizing the landfill leachate concentrated solution by a high-pressure pump until the pressure reaches 2MPa, introducing the landfill leachate concentrated solution into a heat-conducting oil heat exchanger after pressurization, introducing the landfill leachate heated by heat-conducting oil into a reaction system for reaction after the temperature of the landfill leachate in the heat-conducting oil heat exchanger is 200 ℃, introducing the reacted gas-liquid two-phase flow with higher temperature, cooling the reaction leachate by circulating water in a cooler, introducing the cooled landfill leachate into a gas-liquid separator for flash evaporation, emptying tail gas after the flash;
s2, adding an oxidizing solution from the top of the MVR evaporator after preheating, flowing down along the tube wall in a film state under the action of gravity, continuously evaporating a solvent in the process to thicken a solute, conveying crystals to the thickener through a discharge pump after the crystals grow, continuously thickening until the solid content is 50%, returning supernatant to a mother liquor tank from an overflow groove, allowing crystal slurry to enter a centrifuge for centrifugal separation, collecting evaporation condensate of the MVR evaporator into a condensate water tank, and conveying the condensate water to the condensate water tank through the condensate water pump;
s3, discharging the evaporation condensate after heat exchange and temperature reduction to an adjusting tank, adjusting the pH value to 7 in the adjusting tank, entering a two-stage A/O system under the lifting action of a lifting pump of an adjusting tank, wherein the two-stage A/O system is self-flowing, the effluent of a secondary sedimentation tank of the two-stage A/O system is discharged after reaching the standard under the action of a discharge pump, the residual sludge flows back to a subcritical oxidation system under the action of a sludge screw pump, and the rest sludge flows back through a sludge pump.
In this embodiment, in S3, the reflux ratio of the primary aerobic tank and the secondary aerobic tank of the two-stage a/O system is 200%, the reflux ratio of the sludge is 100%, and 25% of the filler for increasing the volume load is added to the aerobic tanks of the two-stage a/O system.
In this embodiment, centrifuge includes shell 1, be equipped with centrifugal net bucket 2 in the shell 1, fixed mounting has fixing base 4 on shell 1's the bottom inner wall, the rectangular channel has been seted up at fixing base 4's top, slidable mounting has rectangle seat 5 in the rectangular channel, the rotation groove has been seted up at rectangle seat 5's top, it installs rotation post 6 to rotate the inslot internal rotation, the top of rotation post 6 and the bottom fixed connection of centrifugal net bucket 2, it has motor 7 to rotate inslot fixed mounting, motor 7's output shaft and the bottom fixed connection who rotates post 6.
In this embodiment, one end of a spring 8 is fixedly mounted on the inner wall of the bottom of the rectangular groove, the other end of the spring 8 is fixedly connected with the bottom of the rectangular seat 5, a first conductive block 9 is fixedly mounted at the bottom of the rectangular seat 5, a second conductive block 10 is fixedly mounted on the inner wall of the bottom of the rectangular groove, a power supply and indicator light 11, the first conductive block 9 and the power supply are fixedly mounted on the outer side of the housing 1, indicator light 11 and second conducting block 10 electric connection in proper order, the fixed cover in the outside of centrifugation net bucket 2 is equipped with annular plate 12, the outside of annular plate 12 is equipped with the inclined plane, two grooves 13 that reset have been seted up to the inner wall of shell 1, equal slidable mounting has trapezoidal piece 14 in two grooves 13 that reset, the bottom of two trapezoidal pieces 14 all contacts with the top of annular plate 12, the equal fixed mounting in one side of two trapezoidal pieces 14 has the one end of pressure spring 15, the other end of pressure spring 15 and the one side inner wall fixed connection of groove 13 that resets.
In this embodiment, the magma gets into centrifugal net bucket 2, along with the increase of magma in centrifugal net bucket 2, centrifugal net bucket 2 moves down, make rectangle seat 5 extrude spring 8 downwards, and simultaneously, centrifugal net bucket 2 drives annular plate 12 and moves down, two trapezoidal pieces 14 are extruded to the inclined plane of annular plate 12, make two trapezoidal pieces 14 drive two pressure springs 15 and keep away from each other, when annular plate 12 crosses two trapezoidal pieces 14, two pressure springs 15 reset, make two trapezoidal pieces 14 carry out spacingly to the top of annular plate 12, and meanwhile, first conducting block 9 and second conducting block 10 contact, warning light 11 lights, stop the joining of magma, then drive through motor 7 and rotate post 6 and rotate, it drives centrifugal net bucket 2 and rotates and carry out centrifugal operation to rotate post 6, adopt this centrifugal operation mode, can control the magma volume of joining in centrifugal net bucket 2.
Example two
Referring to fig. 1-4, a landfill leachate concentrate treatment system comprises a mother liquor tank, a subcritical oxidation system, an MVR evaporative crystallization system, a two-stage A/O system, a batching system, a filter, a regulating tank and a regulating tank lift pump which are sequentially connected, wherein the subcritical oxidation system comprises a high-pressure pump, a heater, a reactor, a cooler and a gas-liquid separator, the input end of the high-pressure pump is connected with the mother liquor tank, the output end of the high-pressure pump is connected with the input end of the heater, the output end of the heater is connected with the input end of the reactor, the output end of the reactor is connected with the input end of the cooler, and the input end of the cooler is connected with the input end of the gas.
In this embodiment, the output of feed proportioning system is connected with the input of filter, and the output of filter is connected with the input of high-pressure pump.
In the embodiment, the heater is a heat-conducting oil heat exchanger, and the garbage leachate concentrated solution is heated to 250 ℃ by heat-conducting oil in the heat-conducting oil heat exchanger and then enters the reactor for reaction.
In this embodiment, MVR evaporation crystallization system includes the MVR evaporimeter, the discharge pump, the thickener, the condensation water pitcher, the condensation water pump, centrifuge, the input setting of MVR evaporimeter is at the top of MVR evaporimeter, the input of MVR evaporimeter is connected with vapour and liquid separator's liquid phase output, the magma output of MVR evaporimeter is connected with the input of discharge pump, the output of discharge pump is connected with the input of thickener, the overflow launder and the mother liquor jar of thickener are connected, the evaporation condensate output of MVR evaporimeter is connected with the input of condensation water pitcher, the output of condensation water pitcher is connected with the input of condensation water pump, the magma output centrifuge's of thickener input is connected.
In this embodiment, the input of surge tank is connected with the output of condensate pump, and the output of surge tank is connected with the input of equalizing basin elevator pump, and the output of equalizing basin elevator pump is connected with two-stage A/O system.
In the embodiment, the secondary sedimentation tank of the two-stage A/O system is connected with a discharge pump and a sludge screw pump, the output end of the sludge screw pump is connected with the mother liquor tank, and the rest sludge of the two-stage A/O system flows back to the mother liquor tank through the sludge pump.
The embodiment also provides a landfill leachate concentrated solution treatment process, which comprises the following steps:
s1, conveying the landfill leachate concentrated solution to a filter after caching and homogenizing in a batching system, removing solid impurities in the filter, pressurizing the landfill leachate concentrated solution by a high-pressure pump until the pressure reaches 5MPa, introducing the landfill leachate concentrated solution into a heat-conducting oil heat exchanger after pressurization, introducing the landfill leachate heated by heat-conducting oil into a reaction system for reaction after the heat-conducting oil heat exchanger is heated to 250 ℃, introducing the reacted gas-liquid two-phase flow with higher temperature, introducing the reacted gas-liquid two-phase flow into a gas-liquid separator for flash evaporation after cooling the gas-liquid two-phase flow by circulating water in a cooler, emptying;
s2, adding an oxidizing solution from the top of the MVR evaporator after preheating, flowing down along the tube wall in a film state under the action of gravity, continuously evaporating a solvent in the process to thicken a solute, conveying crystals to the thickener through a discharge pump after the crystals grow, continuously thickening until the solid content is 60%, returning supernatant to a mother liquor tank from an overflow groove, allowing crystal slurry to enter a centrifuge for centrifugal separation, collecting evaporation condensate of the MVR evaporator into a condensate water tank, and conveying the condensate water to the condensate water tank through the condensate water pump;
s3, discharging the evaporation condensate after heat exchange and temperature reduction to an adjusting tank, adjusting the pH value to 8 in the adjusting tank, entering a two-stage A/O system under the lifting action of a lifting pump of an adjusting tank, wherein the two-stage A/O system is self-flowing, the effluent of a secondary sedimentation tank of the two-stage A/O system is discharged after reaching the standard under the action of a discharge pump, the residual sludge flows back to a subcritical oxidation system under the action of a sludge screw pump, and the rest sludge flows back through a sludge pump.
In this embodiment, in S3, the reflux ratio of the primary aerobic tank and the secondary aerobic tank of the two-stage a/O system is 200%, the reflux ratio of the sludge is 100%, and 30% of the filler for increasing the volume load is added to the aerobic tanks of the two-stage a/O system.
In this embodiment, centrifuge includes shell 1, be equipped with centrifugal net bucket 2 in the shell 1, fixed mounting has fixing base 4 on shell 1's the bottom inner wall, the rectangular channel has been seted up at fixing base 4's top, slidable mounting has rectangle seat 5 in the rectangular channel, the rotation groove has been seted up at rectangle seat 5's top, it installs rotation post 6 to rotate the inslot internal rotation, the top of rotation post 6 and the bottom fixed connection of centrifugal net bucket 2, it has motor 7 to rotate inslot fixed mounting, motor 7's output shaft and the bottom fixed connection who rotates post 6.
In this embodiment, one end of a spring 8 is fixedly mounted on the inner wall of the bottom of the rectangular groove, the other end of the spring 8 is fixedly connected with the bottom of the rectangular seat 5, a first conductive block 9 is fixedly mounted at the bottom of the rectangular seat 5, a second conductive block 10 is fixedly mounted on the inner wall of the bottom of the rectangular groove, a power supply and indicator light 11, the first conductive block 9 and the power supply are fixedly mounted on the outer side of the housing 1, indicator light 11 and second conducting block 10 electric connection in proper order, the fixed cover in the outside of centrifugation net bucket 2 is equipped with annular plate 12, the outside of annular plate 12 is equipped with the inclined plane, two grooves 13 that reset have been seted up to the inner wall of shell 1, equal slidable mounting has trapezoidal piece 14 in two grooves 13 that reset, the bottom of two trapezoidal pieces 14 all contacts with the top of annular plate 12, the equal fixed mounting in one side of two trapezoidal pieces 14 has the one end of pressure spring 15, the other end of pressure spring 15 and the one side inner wall fixed connection of groove 13 that resets.
In this embodiment, the magma gets into centrifugal net bucket 2, along with the increase of magma in centrifugal net bucket 2, centrifugal net bucket 2 moves down, make rectangle seat 5 extrude spring 8 downwards, and simultaneously, centrifugal net bucket 2 drives annular plate 12 and moves down, two trapezoidal pieces 14 are extruded to the inclined plane of annular plate 12, make two trapezoidal pieces 14 drive two pressure springs 15 and keep away from each other, when annular plate 12 crosses two trapezoidal pieces 14, two pressure springs 15 reset, make two trapezoidal pieces 14 carry out spacingly to the top of annular plate 12, and meanwhile, first conducting block 9 and second conducting block 10 contact, warning light 11 lights, stop the joining of magma, then drive through motor 7 and rotate post 6 and rotate, it drives centrifugal net bucket 2 and rotates and carry out centrifugal operation to rotate post 6, adopt this centrifugal operation mode, can control the magma volume of joining in centrifugal net bucket 2.
EXAMPLE III
Referring to fig. 1-4, a landfill leachate concentrate treatment system comprises a mother liquor tank, a subcritical oxidation system, an MVR evaporative crystallization system, a two-stage A/O system, a batching system, a filter, a regulating tank and a regulating tank lift pump which are sequentially connected, wherein the subcritical oxidation system comprises a high-pressure pump, a heater, a reactor, a cooler and a gas-liquid separator, the input end of the high-pressure pump is connected with the mother liquor tank, the output end of the high-pressure pump is connected with the input end of the heater, the output end of the heater is connected with the input end of the reactor, the output end of the reactor is connected with the input end of the cooler, and the input end of the cooler is connected with the input end of the gas.
In this embodiment, the output of feed proportioning system is connected with the input of filter, and the output of filter is connected with the input of high-pressure pump.
In the embodiment, the heater is a heat-conducting oil heat exchanger, and the garbage leachate concentrated solution is heated to 270 ℃ by heat-conducting oil in the heat-conducting oil heat exchanger and then enters the reactor for reaction.
In this embodiment, MVR evaporation crystallization system includes the MVR evaporimeter, the discharge pump, the thickener, the condensation water pitcher, the condensation water pump, centrifuge, the input setting of MVR evaporimeter is at the top of MVR evaporimeter, the input of MVR evaporimeter is connected with vapour and liquid separator's liquid phase output, the magma output of MVR evaporimeter is connected with the input of discharge pump, the output of discharge pump is connected with the input of thickener, the overflow launder and the mother liquor jar of thickener are connected, the evaporation condensate output of MVR evaporimeter is connected with the input of condensation water pitcher, the output of condensation water pitcher is connected with the input of condensation water pump, the magma output centrifuge's of thickener input is connected.
In this embodiment, the input of surge tank is connected with the output of condensate pump, and the output of surge tank is connected with the input of equalizing basin elevator pump, and the output of equalizing basin elevator pump is connected with two-stage A/O system.
In the embodiment, the secondary sedimentation tank of the two-stage A/O system is connected with a discharge pump and a sludge screw pump, the output end of the sludge screw pump is connected with the mother liquor tank, and the rest sludge of the two-stage A/O system flows back to the mother liquor tank through the sludge pump.
The embodiment also provides a landfill leachate concentrated solution treatment process, which comprises the following steps:
s1, conveying the landfill leachate concentrated solution to a filter after caching and homogenizing in a batching system, removing solid impurities in the filter, pressurizing the landfill leachate concentrated solution by a high-pressure pump until the pressure reaches 7.5MPa, introducing the landfill leachate concentrated solution into a heat-conducting oil heat exchanger after pressurizing, heating the landfill leachate concentrated solution to 270 ℃ by heat-conducting oil in the heat-conducting oil heat exchanger, introducing the landfill leachate concentrated solution into a reaction system for reaction, wherein the temperature of a vapor-liquid two-phase flow after reaction is higher, introducing the landfill leachate into a gas-liquid separator after cooling the landfill leachate by circulating water, performing flash evaporation, discharging tail gas after;
s2, adding an oxidizing solution from the top of the MVR evaporator after preheating, allowing the oxidizing solution to flow down along the tube wall in a film state under the action of gravity, continuously evaporating a solvent in the process to thicken a solute, conveying crystals to the thickener through a discharge pump after the crystals grow, continuously thickening until the solid content is 70%, returning supernatant to a mother liquor tank from an overflow tank, allowing crystal slurry to enter a centrifuge for centrifugal separation, collecting evaporation condensate of the MVR evaporator into a condensate water tank, and conveying the condensate water to the condensate water tank through the condensate water pump;
s3, discharging the evaporation condensate after heat exchange and temperature reduction to an adjusting tank, adjusting the pH value to 9 in the adjusting tank, entering a two-stage A/O system under the lifting action of a lifting pump of an adjusting tank, wherein the two-stage A/O system is self-flowing, the effluent of a secondary sedimentation tank of the two-stage A/O system is discharged after reaching the standard under the action of a discharge pump, the residual sludge flows back to a subcritical oxidation system under the action of a sludge screw pump, and the rest sludge flows back through a sludge pump.
In this embodiment, in S3, the reflux ratio of the primary aerobic tank and the secondary aerobic tank of the two-stage a/O system is 200%, the reflux ratio of the sludge is 100%, and 35% of the filler for increasing the volume load is added to the aerobic tanks of the two-stage a/O system.
In this embodiment, centrifuge includes shell 1, be equipped with centrifugal net bucket 2 in the shell 1, fixed mounting has fixing base 4 on shell 1's the bottom inner wall, the rectangular channel has been seted up at fixing base 4's top, slidable mounting has rectangle seat 5 in the rectangular channel, the rotation groove has been seted up at rectangle seat 5's top, it installs rotation post 6 to rotate the inslot internal rotation, the top of rotation post 6 and the bottom fixed connection of centrifugal net bucket 2, it has motor 7 to rotate inslot fixed mounting, motor 7's output shaft and the bottom fixed connection who rotates post 6.
In this embodiment, one end of a spring 8 is fixedly mounted on the inner wall of the bottom of the rectangular groove, the other end of the spring 8 is fixedly connected with the bottom of the rectangular seat 5, a first conductive block 9 is fixedly mounted at the bottom of the rectangular seat 5, a second conductive block 10 is fixedly mounted on the inner wall of the bottom of the rectangular groove, a power supply and indicator light 11, the first conductive block 9 and the power supply are fixedly mounted on the outer side of the housing 1, indicator light 11 and second conducting block 10 electric connection in proper order, the fixed cover in the outside of centrifugation net bucket 2 is equipped with annular plate 12, the outside of annular plate 12 is equipped with the inclined plane, two grooves 13 that reset have been seted up to the inner wall of shell 1, equal slidable mounting has trapezoidal piece 14 in two grooves 13 that reset, the bottom of two trapezoidal pieces 14 all contacts with the top of annular plate 12, the equal fixed mounting in one side of two trapezoidal pieces 14 has the one end of pressure spring 15, the other end of pressure spring 15 and the one side inner wall fixed connection of groove 13 that resets.
In this embodiment, the magma gets into centrifugal net bucket 2, along with the increase of magma in centrifugal net bucket 2, centrifugal net bucket 2 moves down, make rectangle seat 5 extrude spring 8 downwards, and simultaneously, centrifugal net bucket 2 drives annular plate 12 and moves down, two trapezoidal pieces 14 are extruded to the inclined plane of annular plate 12, make two trapezoidal pieces 14 drive two pressure springs 15 and keep away from each other, when annular plate 12 crosses two trapezoidal pieces 14, two pressure springs 15 reset, make two trapezoidal pieces 14 carry out spacingly to the top of annular plate 12, and meanwhile, first conducting block 9 and second conducting block 10 contact, warning light 11 lights, stop the joining of magma, then drive through motor 7 and rotate post 6 and rotate, it drives centrifugal net bucket 2 and rotates and carry out centrifugal operation to rotate post 6, adopt this centrifugal operation mode, can control the magma volume of joining in centrifugal net bucket 2.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a landfill leachate concentrate processing system, is including the mother liquor jar, subcritical oxidation system, MVR evaporation crystallization system, two-stage A/O system, feed proportioning system, filter, surge tank and equalizing basin elevator pump that connect gradually, its characterized in that, subcritical oxidation system includes high-pressure pump, heater, reactor, cooler, vapour and liquid separator, the input of high-pressure pump with the mother liquor jar is connected, the output of high-pressure pump with the input of heater is connected, the output of heater with the input of reactor is connected, the output of reactor with the input of cooler is connected, the input of cooler with vapour and liquid separator's input is connected.
2. A landfill leachate concentrate treatment system according to claim 1, wherein the output of the dosing system is connected to the input of the filter, and the output of the filter is connected to the input of the high pressure pump.
3. The landfill leachate concentrate treatment system of claim 1, wherein the heater is a heat conducting oil heat exchanger, and the landfill leachate concentrate is heated to 200-270 ℃ by heat conducting oil in the heat conducting oil heat exchanger and then enters the reactor for reaction.
4. A landfill leachate concentrate treatment system according to claim 1, the MVR evaporative crystallization system comprises an MVR evaporator, a discharge pump, a thickener, a condensed water tank, a condensed water pump and a centrifuge, the input end of the MVR evaporator is arranged at the top of the MVR evaporator, the input end of the MVR evaporator is connected with the liquid phase output end of the gas-liquid separator, the crystal slurry output end of the MVR evaporator is connected with the input end of the discharge pump, the output end of the discharge pump is connected with the input end of the thickener, the overflow groove of the thickener is connected with the mother liquor tank, the evaporation condensate output end of the MVR evaporator is connected with the input end of the condensate water tank, the output end of the condensed water tank is connected with the input end of the condensed water pump, and the magma output end of the thickener is connected with the input end of the centrifuge.
5. The landfill concentrate treatment system of claim 1, wherein the input end of the conditioning tank is connected to the output end of the condensate pump, the output end of the conditioning tank is connected to the input end of the conditioning tank lift pump, and the output end of the conditioning tank lift pump is connected to the two-stage A/O system.
6. The landfill leachate concentrate treatment system of claim 1, wherein the secondary sedimentation tank of the two-stage A/O system is connected with a discharge pump and a sludge screw pump, an output end of the sludge screw pump is connected with the mother liquor tank, and the rest sludge of the two-stage A/O system flows back to the mother liquor tank through the sludge pump.
7. A landfill leachate concentrated solution treatment process is characterized by comprising the following steps:
s1, conveying the landfill leachate concentrated solution to a filter after caching and homogenizing in a batching system, removing solid impurities in the filter, pressurizing the landfill leachate concentrated solution by a high-pressure pump until the pressure reaches 2-7.5MPa, introducing the landfill leachate concentrated solution into a heat-conducting oil heat exchanger after pressurizing, heating the landfill leachate to the temperature of 200 ℃ by heat-conducting oil in the heat-conducting oil heat exchanger, introducing the landfill leachate into a reaction system for reaction, wherein the temperature of a gas-liquid two-phase flow after reaction is higher, introducing the landfill leachate into a gas-liquid separator for flash evaporation after cooling by circulating water in a cooler, emptying tail gas after flash evaporation, and introducing;
s2, adding an oxidizing solution from the top of an MVR evaporator after preheating, allowing the oxidizing solution to flow down along the tube wall in a film state under the action of gravity, continuously evaporating a solvent in the process to thicken a solute, conveying crystals to the thickener through a discharge pump after the crystals grow, continuously thickening until the solid content is 50-70%, returning supernatant to a mother liquor tank from an overflow tank, allowing crystal slurry to enter a centrifuge for centrifugal separation, collecting evaporation condensate of the MVR evaporator into a condensate water tank, and conveying the condensate water tank by a condensate water pump;
s3, discharging the evaporated condensate after heat exchange and temperature reduction to an adjusting tank, adjusting the pH value to 7-9 in the adjusting tank, entering a two-stage A/O system under the lifting action of an adjusting tank lifting pump, wherein the two-stage A/O system is self-flowing, the effluent of a secondary sedimentation tank of the two-stage A/O system is discharged after reaching the standard under the action of a discharge pump, the residual sludge is refluxed to a subcritical oxidation system under the action of a sludge screw pump, and the rest sludge is refluxed by a sludge pump.
8. The process of claim 7, wherein in step S3, the reflux ratio of the primary aerobic tank and the secondary aerobic tank in the two-stage A/O system is 200%, the reflux ratio of the sludge is 100%, and 25-35% of filler for increasing the volume load is added to the aerobic tank in the two-stage A/O system.
9. The landfill leachate concentrate treatment process according to claim 7, wherein the centrifuge comprises a housing (1), a centrifugal net barrel (2) is arranged in the housing (1), a fixed seat (4) is fixedly arranged on the inner wall of the bottom of the housing (1), a rectangular groove is formed in the top of the fixed seat (4), a rectangular seat (5) is slidably arranged in the rectangular groove, a rotating groove (3) is formed in the top of the rectangular seat (5), a rotating column (6) is rotatably arranged in the rotating groove (3), the top of the rotating column (6) is fixedly connected with the bottom of the centrifugal net barrel (2), a motor (7) is fixedly arranged in the rotating groove (3), and an output shaft of the motor (7) is fixedly connected with the bottom of the rotating column (6).
10. The landfill leachate concentrated solution treatment process according to claim 9, wherein one end of a spring (8) is fixedly mounted on the inner wall of the bottom of the rectangular groove, the other end of the spring (8) is fixedly connected with the bottom of the rectangular seat (5), a first conductive block (9) is fixedly mounted at the bottom of the rectangular seat (5), a second conductive block (10) is fixedly mounted on the inner wall of the bottom of the rectangular groove, a power supply and an indicator light (11) are fixedly mounted on the outer side of the shell (1), the first conductive block (9), the power supply, the indicator light (11) and the second conductive block (10) are electrically connected in sequence, an annular plate (12) is fixedly sleeved on the outer side of the centrifugal mesh barrel (2), an inclined plane is arranged on the outer side of the annular plate (12), two reset grooves (13) are formed in the inner wall of the shell (1), and a trapezoidal block (14) is slidably mounted in each reset groove (13), the bottoms of the two trapezoidal blocks (14) are in contact with the top of the annular plate (12), one end of a pressure spring (15) is fixedly mounted on one side of each of the two trapezoidal blocks (14), and the other end of the pressure spring (15) is fixedly connected with the inner wall of one side of the reset groove (13).
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Application publication date: 20210611 |