CN211198958U - Garbage leachate low-energy-consumption full-quantification treatment system - Google Patents
Garbage leachate low-energy-consumption full-quantification treatment system Download PDFInfo
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- CN211198958U CN211198958U CN201922050673.9U CN201922050673U CN211198958U CN 211198958 U CN211198958 U CN 211198958U CN 201922050673 U CN201922050673 U CN 201922050673U CN 211198958 U CN211198958 U CN 211198958U
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Abstract
The utility model discloses a landfill leachate low energy consumption full-quantization processing system, which comprises an adjusting tank, an anaerobic reactor, a nitrification and denitrification system, a low energy consumption membrane bioreactor, a nanofiltration system and a reverse osmosis system which are connected in sequence, wherein the outlet end of nanofiltration concentrated water of the nanofiltration system is connected with a humic acid extraction system to obtain humic acid, and the outlet end of reverse osmosis concentrated water of the reverse osmosis system is connected with an immersion combustion evaporation system to obtain crystallized residues; the anaerobic reactor is provided with a methane outlet and is connected with a methane purification device, and landfill gas enters the methane purification device for purification; circulating water of the anaerobic reactor is connected with a combustion boiler through a heat exchanger, and hot water generated by heating of a gas boiler is transferred to the circulating water of the anaerobic reactor through the heat exchanger; the utility model has the advantages that: can realize continuous operation of equipment, reach the standard of the effluent quality, save cost and avoid accumulation in membrane concentrated solution treatment.
Description
Technical Field
The utility model relates to a membrane bioreactor, in particular to a garbage leachate low-energy consumption full-quantization treatment system which is suitable for high-concentration organic wastewater such as domestic garbage leachate and belongs to the field of membrane bioreactors.
Background
The traditional landfill leachate treatment process has the problems of large influence by water quality fluctuation, poor operation stability, low yield of effluent, high operation and construction cost, low water yield, difficult treatment of a large amount of residual membrane concentrated solution and the like.
The mainstream treatment process of the waste leachate adopts 'biochemistry + membrane', so that a large amount of membrane concentrated solution can not be treated, and the waste leachate is accumulated in a plant area. The current processing status of the membrane concentrated solution mainly comprises the following steps:
(1) and (3) recharging the landfill site: the accumulation of organic matters difficult to degrade is caused, the salt content is increased, the conductivity is increased, the water yield of the membrane is reduced, and even the membrane cannot run;
(2) back-spray incinerator/slag flushing: the incineration temperature is influenced, the power generation efficiency is low, the ash treatment difficulty is increased, and ash is dissolved into a leachate system and enriched if salt is buried;
(3) indirect heat transfer and evaporation: the scale formation is serious, the heat transfer effect is influenced, the stable operation is basically not realized, the acid adding amount is large, and the operation cost is high;
(4) advanced oxidation: the operation is unstable, the addition amount is large, new salt is introduced, and the difficulty of sludge treatment is increased.
Disclosure of Invention
In order to solve the problems, the utility model discloses a rubbish leachate low energy consumption full quantification processing system can realize equipment continuous operation, the quality of yielding water quality reaches standard volume, practices thrift the cost, the membrane concentrate is handled and is not stored up.
The technical scheme of the utility model is that: a low-energy-consumption full-quantization treatment system for landfill leachate comprises an adjusting tank, an anaerobic reactor, a nitrification and denitrification system, a low-energy-consumption membrane bioreactor, a nanofiltration system and a reverse osmosis system which are sequentially connected, wherein a nanofiltration concentrated water outlet end of the nanofiltration system is connected with a humic acid extraction system to obtain humic acid, and a reverse osmosis concentrated water outlet end of the reverse osmosis system is connected with an immersion combustion evaporation system to obtain crystallized residues; the anaerobic reactor is provided with a methane outlet and is connected with a methane purification device, and landfill gas enters the methane purification device for purification; circulating water of the anaerobic reactor is connected with a combustion boiler through a heat exchanger, and hot water generated by heating heat of a gas boiler is transferred to the circulating water of the anaerobic reactor through the heat exchanger.
Furthermore, the biogas purification device is connected with the combustion boiler to provide fuel for the combustion boiler.
Further, the biogas purification device is connected with the submerged combustion evaporation system to provide fuel for the submerged combustion evaporation system.
Further, the low-energy-consumption membrane bioreactor is communicated with the nanofiltration system through a nanofiltration water supply pump and a booster pump; the nanofiltration system is communicated with the reverse osmosis system through a reverse osmosis water supply pump and a booster pump.
Further, marsh gas purifier includes water seal, deareator, desulfurizer, gas holder, gas delivery pump etc, the water seal top with the deareator import links to each other, deareator's gas outlet with the import of desulfurizer links to each other, the export of desulfurizer with the import of gas holder links to each other, gas delivery pump will gas transport to the air feed point in the gas holder.
The anaerobic reactor comprises a sludge bed at the bottom and is provided with a water inlet, a sludge suspension layer area is arranged at the upper part of the sludge bed, a settling area is arranged at the upper part of the sludge suspension layer area, an air seal is arranged at the bottom of the settling area, air chambers are arranged at two sides of the settling area to generate methane, a water outlet channel is arranged at the upper part of each air chamber, and a water outlet is arranged in the water outlet channel.
The low-energy-consumption membrane bioreactor comprises an anoxic tank, an aerobic tank and a membrane bioreactor, wherein the bottom of the aerobic tank is communicated with the anoxic tank through a nitrifying liquid backflow pipeline, the bottom of the membrane bioreactor is communicated with the anoxic tank through a sludge backflow pipeline, the effluent of the anaerobic reactor is communicated with the top inlet of the anoxic tank, and the outlet end of the membrane bioreactor is communicated with an intermediate water tank.
The nanofiltration system comprises a nanofiltration unit, the nanofiltration unit comprises a cylindrical glass fiber reinforced plastic shell, one end of the glass fiber reinforced plastic shell is provided with a water inlet, the other end of the glass fiber reinforced plastic shell is provided with a concentrated water outlet, the water inlet is provided with a salt water sealing structure, the concentrated water outlet end is provided with an anti-stress device, and the nanofiltration membrane is horizontally fixed in the nanofiltration unit through a binding band and a saddle.
The reverse osmosis system comprises an RO membrane, a water production device, a security filter and a power distribution cabinet, wherein the security filter is connected with the RO membrane through a pipeline, a water production outlet of an RO membrane shell is connected with the water production device, and the power distribution cabinet is used for controlling the running and stopping of an RO unit.
The submerged combustion evaporation system comprises an SCE evaporator, wherein a sediment tank is arranged at the bottom of the SCE evaporator, the bottom of the SCE evaporator is communicated with the top plate of the sediment tank through a pipeline, the bottom of the sediment tank is connected with an inlet of a distilled liquid water delivery pump, the top of the sediment tank is connected with the top of a preheater through a water vapor pipeline, the top of the preheater is communicated with the SCE evaporator through a preheated leachate pipeline, a leachate inlet is arranged at the bottom of the preheater, a condensate outlet and a non-condensable gas outlet are respectively arranged at two sides of the preheater, and condensate and non-condensable gas are respectively discharged; the top of the SCE evaporator is also provided with a methane or landfill gas inlet and a combustion-supporting air inlet.
The utility model has the advantages that: the continuous operation of equipment can be realized, the quality of the effluent reaches the standard and reaches the standard, the cost is saved, and the membrane concentrated solution is not accumulated during the treatment; only a small amount of salt residues are generated, the water yield reaches more than 97.5 percent, and the problems of high energy consumption, incapability of treating membrane concentrated solution and the like in the traditional process are solved.
The present invention will be further explained with reference to the drawings and examples.
Drawings
FIG. 1 is a process flow diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an anaerobic reactor according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a low energy consumption membrane bioreactor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a nanofiltration membrane according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a reverse osmosis system according to an embodiment of the present invention;
FIG. 6 is a schematic structural diagram of an embodiment of the submerged combustion evaporation system of the present invention;
fig. 7 is a schematic structural diagram of a cyclone aerator according to an embodiment of the present invention.
Detailed Description
The following describes preferred embodiments of the present invention. The preferred embodiments described herein are illustrative and explanatory only and are not restrictive of the invention.
Example 1
As shown in figure 1, the low-energy consumption full-quantization treatment system for the landfill leachate comprises an adjusting tank, an anaerobic reactor, a nitrification and denitrification system, a low-energy consumption MBR unit (low-energy consumption membrane bioreactor), a nanofiltration system (nanofiltration unit) and a reverse osmosis system which are sequentially connected, wherein a nanofiltration concentrated water outlet end of the nanofiltration system is connected with a humic acid extraction system to obtain humic acid, and a reverse osmosis concentrated water outlet end of the reverse osmosis system is connected with an immersion combustion evaporation system to obtain crystallized residues; the anaerobic reactor is provided with a methane outlet and is connected with a methane purification device, and landfill gas enters the methane purification device for purification; circulating water of the anaerobic reactor is connected with a combustion boiler through a heat exchanger, and hot water generated by heating heat of a gas boiler is transferred to the circulating water of the anaerobic reactor through the heat exchanger.
The biogas purification device is connected with the combustion boiler and provides fuel for the combustion boiler.
And the methane purification device is connected with the submerged combustion evaporation system and provides fuel for the submerged combustion evaporation system.
The low-energy-consumption membrane bioreactor is communicated with the nanofiltration system through a nanofiltration water supply pump and a booster pump; the nanofiltration system is communicated with the reverse osmosis system through a reverse osmosis water supply pump and a booster pump.
The biogas purification device comprises a water seal, a gas-water separator, a desulfurizer, a gas storage cabinet, a gas delivery pump and the like, wherein the top of the water seal is connected with the inlet of the gas-water separator, the gas outlet of the gas-water separator is connected with the inlet of the desulfurizer, the outlet of the desulfurizer is connected with the inlet of the gas storage cabinet, and the gas delivery pump delivers gas in the gas storage cabinet to a gas supply point.
The processing flow is as follows:
firstly, preprocessing: the factory leachate is pretreated (according to the process requirements) by deslagging, sand setting, oil removal and the like, and then enters an adjusting tank to adjust the water quality and water quantity, so that the leachate can enter a subsequent system with balanced water quality and water quantity.
Second, medium temperature anaerobic reactor (anaerobic reactor): the leachate enters the medium-temperature anaerobic reactor from the regulation tank, organic substances in wastewater are decomposed by means of metabolism of anaerobic microorganisms, most organic substances in the wastewater are removed, and simultaneously, a large amount of biogas can be recycled as an immersion combustion evaporation system, as shown in fig. 2, the anaerobic reactor comprises a sludge bed 21 at the bottom and is provided with a water inlet 22, a sludge suspension layer area 23 is arranged at the upper part of the sludge bed 22, a settling area 24 is arranged at the upper part of the sludge suspension layer area 23, an air seal 25 is arranged at the bottom of the settling area 24, air chambers 26 are arranged at two sides of the settling area 24 to generate biogas, the upper part of each air chamber is a water outlet channel, and the water outlet channel is provided with a water outlet 27.
Thirdly, a low-energy membrane bioreactor (A/O + MBR): the effluent automatically flows into a stage of a low-energy-consumption membrane bioreactor, the whole system adopts a preposed denitrification mode, organic matters, ammonia nitrogen, total nitrogen and the like are removed by utilizing the reaction of a nitrification and denitrification system, clear water of an MBR membrane system enters an intermediate water tank under the suction action of a self-priming pump, and MBR returns sludge to a denitrification tank, so that the sludge concentration is further improved, and the sewage treatment effect is ensured, as shown in FIG. 3, the system comprises an A tank (anoxic tank, denitrification) 31, an O tank (aerobic tank, nitrification) 32 and an MBR tank (membrane bioreactor, solid-liquid separation) 33; the bottom of the O tank is communicated with the A tank through a nitrifying liquid return pipeline 34, the bottom of the membrane bioreactor is communicated with the A tank through a sludge return pipeline 35, the effluent of the anaerobic reactor is communicated with the top inlet of the A tank, and the outlet end of the membrane bioreactor is communicated with the intermediate water tank.
Fourthly, a membrane advanced treatment system (NF + RO): pressurizing the water produced by the low-energy-consumption MBR unit by a nanofiltration water supply pump and a booster pump to enter a nanofiltration (membrane treatment) system, reducing various pollution indexes in the water and meeting the discharge standard by utilizing the interception effect of a nanofiltration membrane (with the aperture of 1-2 nm), discharging the nanofiltration water to an intermediate water tank after reaching the standard, wherein the intermediate water tank is arranged at the front end of the reverse osmosis treatment system and is connected with a reverse osmosis water inlet pump; and conveying the nanofiltration concentrated water to a membrane concentrated solution treatment system, wherein the membrane concentrated solution treatment system is arranged at the front end of the submerged combustion evaporation and is connected with a submerged combustion evaporation water inlet pump. The nanofiltration membrane structure is as shown in fig. 4, and comprises a cylindrical glass fiber reinforced plastic shell 41, wherein one end of the glass fiber reinforced plastic shell 41 is provided with a water inlet 42, the other end of the glass fiber reinforced plastic shell is provided with a concentrated water outlet 43, the water inlet 42 is provided with a brine sealing structure 44, and the concentrated water outlet 43 is provided with an anti-stress device 45. The nanofiltration membrane is horizontally fixed in the nanofiltration unit through a binding belt and a saddle.
The nanofiltration produced water enters a reverse osmosis membrane treatment system through a reverse osmosis water supply pump and a booster pump under pressure, various pollution indexes in the water are reduced and meet the discharge standard by utilizing the interception effect of a reverse osmosis membrane, the reverse osmosis produced water is discharged to a reverse osmosis water producing pool after reaching the standard, and the water producing pool is connected with an external drainage pump; the reverse osmosis concentrated water is delivered to a membrane concentrated solution treatment system, and the membrane concentrated solution treatment system is arranged at the front end of the submerged combustion evaporation and is connected with a submerged combustion evaporation water inlet pump. The reverse osmosis system is constructed as shown in fig. 5, and comprises an RO membrane 51, a water production device 52, a cartridge filter 53 and a power distribution cabinet 54. The security filter is connected with the RO membrane through a pipeline, a water outlet of the RO membrane shell is connected with the water producing device, and the power distribution cabinet is arranged beside the unit and used for controlling the running and the stopping of the RO unit.
Membrane concentrate treatment system (FZS + SCE): conveying the nanofiltration concentrated water to a humic acid extraction system, treating humic acid produced water in a reverse osmosis system, and feeding humic acid concentrated liquid into an immersion combustion evaporation system.
The reverse osmosis concentrated water and the humic acid concentrated solution are jointly conveyed to an immersion combustion evaporation system, purified methane or plant landfill gas and the like are used as heat sources to carry out further evaporation concentration decrement treatment on the concentrated solution, and finally only a small amount of residues remain in the whole system, the immersion combustion evaporation system is shown in figure 6 and comprises an SCE evaporator 61, a sediment tank 62 and a residual evaporation liquid water conveying pump 63 are arranged at the bottom of the SCE evaporator 61, the bottom of the SCE evaporator is communicated with the top plate of the sediment tank through a pipeline, and the bottom of the sediment tank is connected with an inlet of the residual evaporation liquid water conveying pump. The top of the preheater 65 is connected with the top of the preheater 65 through a steam pipeline 64, the top of the preheater 65 is communicated with the SCE evaporator 61 through a preheated leachate pipeline 66, the bottom of the preheater 65 is provided with a leachate inlet 67, and two sides of the preheater 65 are respectively provided with a condensate outlet and a non-condensable gas outlet for respectively discharging condensate and non-condensable gas; the top of the SCE evaporator 61 is also provided with a biogas or landfill gas inlet 68 and a combustion air inlet 69.
The removal rate of the external circulation high-efficiency anaerobic reactor to COD is more than 75% stably according to the water quality of inlet water, can reach up to 90%, the COD of outlet water is less than 8000 mg/L stably, the concentration of generated biogas stably reaches more than 65%, the generated biogas can be used as resource utilization, meanwhile, the optimization design ensures that the actual operation problems of reactor blockage, stable formation of granular sludge, sludge discharge, sludge accumulation and the like can not occur in the operation of equipment, and the engineered application is achieved.
Low energy aeration system (swirl aerator): the device is arranged at the bottom of the nitrification tank, adopts an OHR rotational flow aeration mode, has good stirring effect in the tank, is uniform in aeration, does not need other matched equipment, has high utilization rate of dissolved oxygen, does not attenuate along with equipment loss, has very low power consumption per ton of water, and is shown in figure 7, and the rotational flow aerator 7 is provided with a gas inlet 71 and a discharge outlet 72.
The MBR system with low energy consumption adopts an immersed MBR, the MBR mode has the characteristics of low energy consumption, stable water quality of produced water, good solid-liquid separation effect and the like, wherein the low energy consumption is mainly embodied in that the scouring mode of the membrane is characterized in that the shaking of membrane filaments is completed due to bottom aeration, and the MBR system is different from a tubular MBR system which needs to adopt a large-flow circulating pump to improve the flow velocity of water on the surface of the membrane and needs higher energy consumption.
Extracting nanofiltration concentrated solution and humic acid: changing waste into valuable, and realizing the high-efficiency separation of humic acid and toxic and harmful substances such as inorganic salt and the like; the purified water yield of the system is improved, the treatment difficulty of the wastewater is reduced, and the water yield of the humic acid system can reach 95%.
Submerged combustion evaporation, namely a submerged combustion evaporator (patent number: Z L200410042792.5), high-temperature flue gas is directly contacted with leachate to realize efficient mass and heat transfer, a heat transfer partition wall is omitted, the adverse effects of scaling and corrosion on equipment and operation are avoided, the monomer processing capacity is high, the occupied area is saved, the impact load resistance is good, the combustion space is fully utilized, a vaporization heat source is provided, pollutants in fuel and vaporized gas are destroyed, the operation is intelligent, the continuous and stable operation can be automatically carried out for a long time, and finally only a small amount of residues are generated.
The removal rate of the external circulation high-efficiency anaerobic reactor to COD is more than 75 percent and can reach 90 percent according to the water quality of inlet water, and the COD stability of outlet water is less than 8000 mg/L.
Claims (10)
1. The garbage leachate low-energy consumption full-quantification treatment system is characterized in that: the system comprises a regulating tank, an anaerobic reactor, a nitrification and denitrification system, a low-energy-consumption membrane bioreactor, a nanofiltration system and a reverse osmosis system which are sequentially connected, wherein a nanofiltration concentrated water outlet end of the nanofiltration system is connected with a humic acid extraction system to obtain humic acid, and a reverse osmosis concentrated water outlet end of the reverse osmosis system is connected with an immersion combustion evaporation system to obtain crystallized residues; the anaerobic reactor is provided with a methane outlet and is connected with a methane purification device, and landfill gas enters the methane purification device for purification; circulating water of the anaerobic reactor is connected with a combustion boiler through a heat exchanger, and hot water generated by heating heat of a gas boiler is transferred to the circulating water of the anaerobic reactor through the heat exchanger.
2. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: the biogas purification device is connected with the combustion boiler.
3. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: and the methane purification device is connected with the submerged combustion evaporation system and provides fuel for the submerged combustion evaporation system.
4. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: the low-energy-consumption membrane bioreactor is communicated with the nanofiltration system through a nanofiltration water supply pump and a booster pump; the nanofiltration system is communicated with the reverse osmosis system through a reverse osmosis water supply pump and a booster pump.
5. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: the biogas purification device comprises a water seal, a gas-water separator, a desulfurizer, a gas storage cabinet and a gas delivery pump, wherein the top of the water seal is connected with the inlet of the gas-water separator, the gas outlet of the gas-water separator is connected with the inlet of the desulfurizer, the outlet of the desulfurizer is connected with the inlet of the gas storage cabinet, and the gas delivery pump delivers gas in the gas storage cabinet to a gas supply point.
6. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: the anaerobic reactor comprises a sludge bed at the bottom and is provided with a water inlet, a sludge suspension layer area is arranged at the upper part of the sludge bed, a settling area is arranged at the upper part of the sludge suspension layer area, an air seal is arranged at the bottom of the settling area, air chambers are arranged at two sides of the settling area to generate methane, a water outlet channel is arranged at the upper part of each air chamber, and a water outlet is arranged in the water outlet channel.
7. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: the low-energy-consumption membrane bioreactor comprises an anoxic tank, an aerobic tank and a membrane bioreactor, wherein the bottom of the aerobic tank is communicated with the anoxic tank through a nitrifying liquid backflow pipeline, the bottom of the membrane bioreactor is communicated with the anoxic tank through a sludge backflow pipeline, the effluent of the anaerobic reactor is communicated with the top inlet of the anoxic tank, and the outlet end of the membrane bioreactor is communicated with an intermediate water tank.
8. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: the nanofiltration system comprises a nanofiltration unit, the nanofiltration unit comprises a cylindrical glass fiber reinforced plastic shell, one end of the glass fiber reinforced plastic shell is provided with a water inlet, the other end of the glass fiber reinforced plastic shell is provided with a concentrated water outlet, the water inlet is provided with a salt water sealing structure, the concentrated water outlet end is provided with an anti-stress device, and the nanofiltration membrane is horizontally fixed in the nanofiltration unit through a binding band and a saddle.
9. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: the reverse osmosis system comprises an RO membrane, a water production device, a security filter and a power distribution cabinet, wherein the security filter is connected with the RO membrane through a pipeline, a water production outlet of an RO membrane shell is connected with the water production device, and the power distribution cabinet is used for controlling the running and stopping of an RO unit.
10. The garbage leachate low-energy consumption full-quantification treatment system as recited in claim 1, wherein: the submerged combustion evaporation system comprises an SCE evaporator, wherein a sediment tank is arranged at the bottom of the SCE evaporator, the bottom of the SCE evaporator is communicated with the top plate of the sediment tank through a pipeline, the bottom of the sediment tank is connected with an inlet of a distilled liquid water delivery pump, the top of the sediment tank is connected with the top of a preheater through a water vapor pipeline, the top of the preheater is communicated with the SCE evaporator through a preheated leachate pipeline, a leachate inlet is arranged at the bottom of the preheater, a condensate outlet and a non-condensable gas outlet are respectively arranged at two sides of the preheater, and condensate and non-condensable gas are respectively discharged; the top of the SCE evaporator is also provided with a methane or landfill gas inlet and a combustion-supporting air inlet.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772874A (en) * | 2022-06-20 | 2022-07-22 | 中国恩菲工程技术有限公司 | Self-supplying heat treatment method and system for landfill leachate |
| CN115947506A (en) * | 2023-03-03 | 2023-04-11 | 中工环境科技有限公司 | Kitchen waste concentrated solution treatment system and method |
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2019
- 2019-11-25 CN CN201922050673.9U patent/CN211198958U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772874A (en) * | 2022-06-20 | 2022-07-22 | 中国恩菲工程技术有限公司 | Self-supplying heat treatment method and system for landfill leachate |
| CN115947506A (en) * | 2023-03-03 | 2023-04-11 | 中工环境科技有限公司 | Kitchen waste concentrated solution treatment system and method |
| CN115947506B (en) * | 2023-03-03 | 2023-11-03 | 中工环境科技有限公司 | Kitchen waste concentrated solution treatment system and method |
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