CN112225372B - Landfill leachate wastewater treatment system and treatment method - Google Patents
Landfill leachate wastewater treatment system and treatment method Download PDFInfo
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- CN112225372B CN112225372B CN202010981961.0A CN202010981961A CN112225372B CN 112225372 B CN112225372 B CN 112225372B CN 202010981961 A CN202010981961 A CN 202010981961A CN 112225372 B CN112225372 B CN 112225372B
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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
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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- 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
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Abstract
The invention relates to a landfill leachate wastewater treatment system and a treatment method. Among this landfill leachate effluent disposal system, through the preliminary treatment system, the DTRO system, evaporation system, mutually supporting of drying system and RO system, final exhaust first solid is handled with the mode that the second solid accessible was buried, can not cause the pollution to the environment because it does not contain moisture, and the purity of exhaust first water purification and second water purification is higher, can normal use already, and can not cause the pollution to the environment, and remaining waste water can constantly circulate in landfill leachate effluent disposal system and realize solid-liquid separation. Therefore, the landfill leachate wastewater treatment system can realize the thorough treatment of the landfill leachate wastewater, achieve better treatment effect and has no pollution to the environment.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a garbage leachate wastewater treatment system and a garbage leachate wastewater treatment method.
Background
The landfill leachate waste water of rubbish transfer station has the characteristics that pollutant concentration is high, the water yield is little, and the waste water composition is comparatively complicated, and the suspended solid is higher, and waste water can be acidified gradually along with the extension of standing time, the foul condition appears.
At present, two methods for treating landfill leachate wastewater exist, one is an original landfill method, namely the landfill wastewater permeates into soil and is purified and absorbed by the soil, but the method seriously pollutes the environment; the other mode is centralized treatment, namely the percolate wastewater is collected and is subjected to centralized treatment by using conventional sewage treatment equipment after reaching a certain amount, but the mode can only remove specific harmful substances in the wastewater and cannot realize complete and thorough treatment of the wastewater.
Disclosure of Invention
Therefore, a landfill leachate wastewater treatment system which is free of environmental pollution and good in treatment effect is needed. In addition, a method for treating the landfill leachate wastewater is also provided.
A landfill leachate wastewater treatment system comprises a pretreatment system, a DTRO system, an evaporation system, an RO system and a drying system; the pretreatment system, the DTRO system and the evaporation system are connected in sequence; the pretreatment system is used for pretreating landfill leachate wastewater to obtain dehydrated first solid and filtrate, the DTRO system is used for treating the filtrate to obtain first purified water and concentrated solution, and the evaporation system can evaporate and separate the concentrated solution to obtain second solid and distilled water; the drying system is connected with the evaporation system to dry the second solid; the RO system is connected with the evaporation system to reprocess the distilled water to obtain second purified water and turbid water; the first solid and the second solid can be discharged outwards and buried, the first purified water and the second purified water can be discharged outwards, and the turbid water can be introduced into the evaporation system to be evaporated and separated again.
Among the above-mentioned landfill leachate effluent disposal system, through the preliminary treatment system, the DTRO system, evaporation system, mutually supporting of drying system and RO system, final exhaust first solid is handled with the mode that the second solid accessible was buried, can not cause the pollution to the environment because it does not contain moisture, and the purity of exhaust first water purification and second water purification is higher, can normal use already, and can not cause the pollution to the environment, and remaining waste water can constantly circulate and realize solid-liquid separation in landfill leachate effluent disposal system. Therefore, the landfill leachate wastewater treatment system can thoroughly treat the landfill leachate wastewater, achieves a better treatment effect, and has no pollution to the environment.
In one embodiment, at least one of the following schemes is also included:
the pretreatment system comprises an adjusting coagulating sedimentation module for carrying out sedimentation treatment on the landfill leachate wastewater, a sludge concentration module connected with the adjusting coagulating sedimentation module, a plate frame dehydration module connected with the sludge concentration module, an intermediate filtration module connected with the adjusting coagulating sedimentation module and the plate frame dehydration module, and a medicament adding module for adding medicaments to the adjusting coagulating sedimentation module and the intermediate filtration module;
the landfill leachate wastewater treatment system comprises a transfer tank, and the pretreatment system, the DTRO system and the RO system are integrated in the transfer tank; the evaporation system is of an integrated structure;
the drying system is used for drying the second solid in a spray drying mode.
In one embodiment, the evaporation system comprises a preheating module for connecting with the DTRO system, a separation module connected with the preheating module, and a circulating heating module connected with the separation module; the drying system is connected with the separation module.
In one embodiment, the separation module comprises a separation chamber and a solid-liquid separator connected with the separation chamber, the preheating module and the circulating heating module are both connected with the separation chamber, and the solid-liquid separator is connected with the drying system.
In one embodiment, the circulating heating module comprises a heater and a compressor, and the compressor is connected with the separation chamber to compress and heat the vapor led out from the separation chamber and then convey the vapor to the heater; the heater is connected with the separation chamber to circularly heat the concentrated solution in the separation chamber; the heater is connected with the preheating module.
In one embodiment, the pre-heating module comprises a heat exchanger connected to the DTRO system and an exhaust condenser connected to the heat exchanger, the exhaust condenser connected to the separation module; the high-temperature distilled water generated by the circulating heating module can be conveyed to the heat exchanger to carry out first heating on the concentrated solution, and the high-temperature steam generated by the circulating heating module can be conveyed to the exhaust condenser to carry out second heating on the concentrated solution.
A landfill leachate wastewater treatment method comprises the following steps:
introducing the landfill leachate wastewater into a pretreatment system for pretreatment to obtain filtrate and a first solid capable of being buried;
introducing the filtrate into a DTRO system to perform reverse osmosis type filtration and separation to obtain a concentrated solution and first purified water which can be discharged;
introducing the concentrated solution into an evaporation system for evaporation and separation to obtain a second solid and distilled water;
introducing the second solid into a drying system for drying treatment and then discharging to landfill;
and introducing the distilled water into an RO system for reverse osmosis type filtration and separation to obtain second purified water and turbid water, wherein the second purified water is discharged outside, and the turbid water is introduced into an evaporation system.
According to the landfill leachate wastewater treatment method, the landfill leachate wastewater is sequentially subjected to pretreatment, concentration treatment, DTRO treatment, evaporation treatment, drying treatment and RO treatment, so that the finally discharged first solid and second solid can be directly buried, the environment cannot be polluted due to the fact that the first solid and the second solid do not contain moisture, the purity of the discharged first purified water and the second purified water is high, the first purified water and the second purified water can be normally used, the environment cannot be polluted, and the rest wastewater can be continuously circulated in a landfill leachate wastewater treatment system to realize solid-liquid separation. Therefore, the method for treating the waste water of the landfill leachate can realize the thorough treatment of the waste water of the landfill leachate, achieve better treatment effect and have no pollution to the environment.
In one embodiment, the step of introducing the landfill leachate wastewater into the pretreatment system for pretreatment to obtain filtrate and a first solid capable of being buried further comprises the following steps:
controlling a medicament adding module to add medicaments into the adjusting coagulating sedimentation module and the middle filtering module;
introducing the landfill leachate wastewater into an adjusting coagulating sedimentation module for mixed sedimentation to obtain slurry and supernatant;
guiding the slurry into a sludge concentration module for concentration to obtain concentrated slurry;
introducing the concentrated slurry into a plate frame dehydration module for dehydration to obtain first solid and muddy water, wherein the first solid is discharged and then buried;
and (4) introducing the muddy water and the supernatant into a middle filtering module for filtering to obtain a filtrate.
In one embodiment, the step of introducing the concentrated solution into an evaporation system for evaporation separation to obtain a second solid and distilled water further comprises the following steps:
introducing the concentrated solution into a preheating module for preheating;
introducing the preheated concentrated solution into a separation chamber, and evaporating and separating the concentrated solution in the separation chamber to obtain steam;
introducing the concentrated solution into a solid-liquid separator for solid-liquid separation to obtain a second solid and a circulating solution, wherein the circulating solution is introduced into a separation chamber;
introducing steam into a circulating heating module to heat up to obtain high-temperature steam, and circularly heating the concentrated solution in the separation chamber by the high-temperature steam;
and introducing the high-temperature carrier discharged by the circulating heating module into a preheating module to preheat the concentrated solution, and forming distilled water after the high-temperature carrier releases heat.
In one embodiment, the high-temperature carrier discharged by the circulating heating module comprises high-temperature steam and high-temperature distilled water, the high-temperature steam can be introduced into the exhaust condenser to carry out secondary heating on the concentrated solution, the high-temperature distilled water formed after heat exchange with the concentrated solution in the separation chamber and the concentrated solution in the exhaust condenser can be introduced into the heat exchanger to carry out primary heating on the concentrated solution, and the low-temperature distilled water is obtained after heat exchange.
Drawings
FIG. 1 is a schematic structural diagram of a landfill leachate wastewater treatment system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a landfill leachate wastewater treatment method according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
As shown in fig. 1, the landfill leachate wastewater treatment system according to an embodiment of the present invention includes a pretreatment system, a DTRO system, an evaporation system, an RO system, and a drying system. The pretreatment system, the DTRO system and the evaporation system are sequentially connected, the pretreatment system is used for pretreating garbage leachate wastewater to obtain dehydrated first solid and filtrate, the DTRO system is used for treating the filtrate to obtain first purified water and concentrated solution, and the evaporation system can perform evaporation separation on the concentrated solution to obtain second solid and distilled water. The drying system is connected with the evaporation system to dry the second solid; the RO system is connected with the evaporation system to reprocess the distilled water to obtain second purified water and turbid water. Therefore, the first solid and the second solid can be buried after being discharged, the first purified water and the second purified water can be directly discharged, and the turbid water can be introduced into the evaporation system for evaporation and separation again.
Among the above-mentioned landfill leachate effluent disposal system, through the preliminary treatment system, the DTRO system, evaporation system, mutually supporting of drying system and RO system, final exhaust first solid is handled with the mode that the second solid accessible was buried, can not cause the pollution to the environment because it does not contain moisture, and the purity of exhaust first water purification and second water purification is higher, can normal use already, and can not cause the pollution to the environment, and remaining waste water can constantly circulate and realize solid-liquid separation in landfill leachate effluent disposal system. Therefore, the landfill leachate wastewater treatment system can thoroughly treat the landfill leachate wastewater, achieves a better treatment effect, and has no pollution to the environment.
In one embodiment, the pretreatment system comprises a regulation coagulating sedimentation module, a sludge concentration module, a plate frame dehydration module, an intermediate filtration module and a medicament adding module. Wherein, landfill leachate waste water lets in and adjusts the coagulating sedimentation module in, adjusts the coagulating sedimentation module and is used for deposiing the processing to landfill leachate waste water. Adjust coagulating sedimentation module, sludge concentration module and sheet frame dehydration module and be connected in order, sludge concentration module is used for concentrating the precipitate that the module produced of adjusting coagulating sedimentation to further obtain first solid after the dehydration of sheet frame dehydration module, thereby make and not contain moisture in the first solid so that the landfill when discharging. And the adjusting coagulating sedimentation module and the plate frame dehydration module are respectively connected with the middle filtering module, supernatant generated by the adjusting coagulating sedimentation module and muddy water generated by the plate frame dehydration module can be further introduced into the middle filtering module for filtering treatment, so that filtrate is obtained, and the filtrate can be introduced into the DTRO system for concentration treatment. In addition, adjust coagulating sedimentation module and middle filtration module and all be connected with the medicament interpolation module, the medicament interpolation module can add the medicament to adjusting coagulating sedimentation module and middle filtration module to carry out chemical treatment to the waste water in two modules.
Specifically, the medicament adding module comprises a first medicament box, a second medicament box and a third medicament box, wherein sulfuric acid (H) is sequentially stored in the first medicament box, the second medicament box and the third medicament box2SO4) Polyacrylamide (PAM), polyaluminium chloride (PAC). The medicament adding module adds Polyacrylamide (PAM) and polyaluminium chloride (PAC) into the adjusting coagulating sedimentation module in a pipeline adding mode, so thatSuspended matter (SS), partial Chemical Oxygen Demand (COD) in the wastewater are removed (to be confirmed), so that large particles in the wastewater are precipitated to obtain supernatant and mud. In addition, the agent adding module adds sulfuric acid (H) in a pipeline adding mode2SO4) And adding the waste liquid into the intermediate filtering module so as to adjust the pH of the waste liquid in the intermediate filtering module.
Specifically, the filtrate that obtains after middle filtration module filters is leading-in to the DTRO system, and the DTRO system can carry out the concentrated processing to the filtrate to the first water purification of discharge, thereby make the volume of going to the concentrate of follow-up evaporation system reduce, and then reduce the energy consumption, save evaporation system investment cost and running cost. Meanwhile, the purity of the first purified water discharged by the DTRO system is high, and the first purified water is directly discharged without polluting the environment, so that zero discharge of pollutants is realized. Further, the recovery of the DTRO system is 75% -90%. In this example, the DTRO system was selected to have a recovery rate of 80%.
In addition, pretreatment systems still includes the feed liquor pond that is used for collecting landfill leachate waste water, through setting up the feed liquor pond, can collect landfill leachate waste water under the more condition of landfill leachate waste water to alleviate waste water treatment pressure. The garbage leachate wastewater in the feed liquid pool is pumped into the adjusting coagulating sedimentation module through the feed liquid pump. In addition, a sludge discharge pump can be arranged between the adjusting coagulating sedimentation module and the sludge concentration module and between the sludge concentration module and the plate frame dehydration module so as to promote the flow of slurry among the modules. In addition, a transfer pump may also be provided between the intermediate filtration module and the DTRO module to power the flow of filtrate.
In this embodiment, landfill leachate effluent disposal system includes the transfer case, and pretreatment systems, DTRO system and RO system all integrate in the transfer case, and moreover, the evaporation system is integrated form structure. Therefore, through the integrated design, each system, the evaporation system and the drying system in the transfer box can be independently carried, and the carrying and transferring convenience of the garbage leachate wastewater treatment system is improved; when the garbage leachate reaches the target position, the garbage leachate can be used only by connecting the three through pipelines and connecting water and electricity, so that the assembly difficulty of the garbage leachate wastewater treatment system is reduced, and the assembly efficiency is improved; compare with conventional effluent disposal system, the landfill leachate effluent disposal system of this application is owing to have higher integrated level, and its volume is less, and occupation space is also less, is applicable to the narrow space of rubbish transfer station, also further is favorable to entire system's transport circulation.
In one embodiment, the vaporization system includes a preheating module for connection to the DTRO system, a separation module connected to the preheating module, and a circulating heating module connected to the separation module. The separation module is got into after preheating through preheating the module by the leading-in concentrate of DTRO system, simultaneously, under the cyclic heating effect of circulation heating module, the separation module can separate the concentrate to obtain second solid and steam, wherein, steam can get into circulation heating module, form high temperature steam after the intensification, carry out the heat exchange and realize the circulation heating with the concentrate in the separation module, and finally form the distilled water after the high temperature steam cooling, carry out advanced treatment with leading-in RO system. The drying system is connected to the separation module and the second solid produced by the separation module can be directed to the drying system after the drying process of the drying system so as to be able to be discharged and buried.
Further, the separation module comprises a separation chamber and a solid-liquid separator connected with the separation chamber, and the solid-liquid separator is connected with the drying system. The preheating module is connected with the separating chamber, preheats the concentrate by the preheating module, and then introduces the concentrate into the separating chamber. The circulating heating module is connected with the separation chamber, circularly heats the concentrated solution in the separation chamber, water in the concentrated solution in the separation chamber is evaporated, the formed steam is further introduced into the circulating heating module, and the steam is further subjected to heat exchange with the concentrated solution in the separation chamber after being heated so as to realize circulating heating. And continuously evaporating water in the concentrated solution in the separation chamber to further concentrate the concentrated solution, and after centrifugal separation by the solid-liquid separator, realizing solid-liquid separation to obtain a second solid and a circulating solution, wherein the second solid is introduced into the drying system, is discharged after drying treatment of the drying system and is buried, and the circulating solution is introduced into the separation chamber again to continue circulation. It should be noted that the drying system performs the drying treatment on the second solid by spray drying, that is, the second solid is sprayed from above, and the drying air is blown from below to above, so as to achieve sufficient contact with the second solid, prolong the drying time, and improve the drying effect.
Further, the separation chamber employs a salt leg crystallizer. Concentrate after preheating the module heating gets into the upper strata fluidized bed of separator chamber along the tangential, because the temperature of concentrate is slightly less than boiling point temperature and is unsaturated state, the concentrate of tangential entering separator chamber upper strata fluidized bed, mix together with original supersaturated concentrate in the separator chamber, because contain a large amount of tiny crystals in the original supersaturated concentrate, tiny crystal can be eliminated after unsaturated concentrate gets into, avoid tiny crystal to participate in the circulation heating module to the circulation heating in-process of concentrate in the separator chamber and block up the pipeline.
In one embodiment, the circulating heating module comprises a heater and a compressor, the compressor is connected with the separation chamber to compress and heat the steam led out from the separation chamber to form high-temperature steam, and the high-temperature steam is conveyed to the heater, the heater is connected with the separation chamber, when the concentrated solution in the separation chamber circularly flows to the heater, the high-temperature steam in the heater exchanges heat with the concentrated solution, so that the temperature of the concentrated solution is increased, and the concentrated solution continuously flows in along with the concentrated solution, and the high-temperature steam in the heater realizes circulating heating of the concentrated solution. It should be noted that the heated concentrated solution flows out of the heater into the low-pressure separation chamber, and due to the sudden pressure reduction, the concentrated solution is subjected to flash evaporation in the separation chamber, so as to obtain concentration, and after the concentration multiple meeting the process requirement is reached, the first solid and the circulating liquid can be obtained through centrifugal separation by the solid-liquid separator.
Furthermore, a forced circulation pump is connected between the heater and the separation chamber to realize forced circulation of the concentrated solution in the separation chamber. Specifically, the forced circulation pump is controlled by VFD (variable frequency drive), when the forced circulation pump is initially started to run, Total Dissolved Solids (TDS) in the concentrated solution is low, the specific gravity is small, the frequency of the forced circulation pump is automatically adjusted within the range of 0-50 Hz according to the specific gravity and the automatic detection of outlet pressure, and the flow circulation requirement is met.
In addition, a plurality of heat exchange pipes are connected in the heater. Unsaturated concentrated solution led in from preheating module mixes with the original supersaturated concentrated solution in the separator chamber, shunts to each heat exchange tube under the compulsory action of force circulation pump to the produced heat heating of heat exchange tube outside high temperature steam condensation heaies up in heater department, thereby realizes the intensification of concentrated solution. It should be noted that, when the concentrated solution is introduced into the heat exchange tube, the flow rate of the concentrated solution is controlled to be 1.5 m/s-3.5 m/s, so that the scaling probability can be reduced, and the heat exchange efficiency of the concentrated solution is not influenced. In addition, when the concentrated solution flows at a high speed from the heat exchange tube, the pressure in the heat exchange tube is controlled to be lower than the saturated steam pressure corresponding to the temperature in the heat exchange tube, so that the concentrated solution cannot boil in the heat exchange tube and is not evaporated in the heat exchange tube, and the concentrated solution is ensured to be evaporated in the separation chamber.
Specifically, be provided with two-layer high-efficient defogging structure in the separation chamber upper side, the lower floor adopts folded plate formula defroster, and the upper strata adopts the silk screen formula defroster, through control liquid/vapour separation area and separation height to make the steam of evaporation production in the separation chamber, taken out by the compressor after abundant defogging, and in the leading-in heater of high temperature steam is formed to the intensification of compressor after stepping up. In addition, a PLC automatic control period is arranged in the separation chamber to realize regular water cleaning of the wire mesh type demister, so that the stability of the treated water quantity and the effluent quality can be ensured for a long time.
Specifically, the heater is connected with preheating the module, and heater exhaust high temperature carrier can let in and locate heating module in advance to satisfy preheating the module and preheat thermal needs when the concentrate, thereby the utilization ratio of increase of energy. It should be noted that the high-temperature carrier discharged by the heater may be high-temperature steam, or high-temperature distilled water obtained by condensing the concentrated solution in the separation chamber after the high-temperature steam performs heat exchange. After the high temperature carrier is led into and is preheated the module, can preheat the concentrate of preheating module department, the high temperature carrier carries out the heat exchange with the concentrate and forms the distilled water after the heat release, and obtains deep purification after leading into the RO system of distilled water.
Specifically, in this embodiment, the preheating module includes a heat exchanger and an exhaust condenser connected to the heat exchanger, the heat exchanger is connected to the DTRO system, and the exhaust condenser is connected to the separation module. Specifically, the concentrated solution obtained by the separation of the DTOR system is introduced into a heat exchanger, the heat exchanger heats the concentrated solution for the first time to enable the concentrated solution to be primarily heated, then the concentrated solution is further introduced into an exhaust condenser, the exhaust condenser heats the concentrated solution for the second time to enable the concentrated solution to be further heated, and the concentrated solution is introduced into a separation chamber, so that the concentrated solution has a higher temperature when entering the separation chamber, and the evaporation operation of the concentrated solution is facilitated.
Further, high-temperature distilled water generated by the circulating heating module can be conveyed to the heat exchanger to perform first heating on the concentrated solution, and high-temperature steam generated by the circulating heating module can be conveyed to the exhaust condenser to perform second heating on the concentrated solution. Specifically, after the high-temperature steam generated by the compressor is introduced into the heater, a part of the high-temperature steam is used for circularly heating the concentrated solution in the separation chamber, and after the high-temperature steam is subjected to heat exchange with the concentrated solution in the separation chamber, the part of the high-temperature steam can condense to obtain high-temperature distilled water, and the high-temperature distilled water is introduced into the heat exchanger to be capable of performing heat exchange with the concentrated solution to heat the concentrated solution for the first time. After the high-temperature steam generated by the compressor is introduced into the heater, the other part of the high-temperature steam is introduced into the exhaust condenser so as to heat the flowing concentrated solution for the second time in the exhaust condenser. It should be noted that, because the heat of the high-temperature steam is higher than that of the high-temperature distilled water, the second heating can make the concentrated solution reach a higher temperature than the first heating, so as to gradually heat the concentrated solution to raise the temperature.
In one embodiment, the high-temperature steam introduced into the exhaust condenser is condensed after heat exchange with the concentrated solution to obtain distilled water, and the distilled water has a higher temperature, so that the distilled water can also be introduced into the heat exchanger to heat the concentrated solution for the first time. Specifically, the vaporization system includes a distilled water tank. The high temperature steam that lets in the exhaust condenser is in can flowing into the distilled water jar with the condensate water that the condensate obtained after carrying out the heat exchange with the concentrate, and high temperature steam in the heater is in carrying out the heat exchange with the concentrate after the condensate water also can flow into the distilled water jar, so, the distilled water in the distilled water jar is owing to have higher temperature, can let in heat exchanger and carry out the heating for the first time to the concentrate, and after heat exchanger is in the concentrate and realizes the heat exchange, the further heat release of high temperature distilled water, thereby discharge microthermal distilled water to RO system.
In addition, the evaporation module further comprises a concentrate pump disposed between the separation chamber and the solid-liquid separator to provide power for the flow of concentrate to the solid-liquid separator. The evaporation module also comprises a circulating liquid tank and a circulating liquid pump. The circulating liquid separated by the solid-liquid separator is collected in a circulating liquid tank and is introduced into the separation chamber under the action of a circulating liquid pump. The precipitate of the circulating liquid in the circulating liquid tank may be transferred to a drying system by a circulating liquid pump and dried. In addition, the evaporation module also comprises a distilled water pump, and the distilled water in the distilled water tank is guided into the heat exchanger to heat the concentrated solution for the first time under the driving action of the distilled water pump.
Specifically, the RO system can perform reverse osmosis type filtration separation on distilled water to obtain second purified water with higher purity, which can be directly discharged after collection without causing pollution to the environment. In addition, the turbid water generated by the RO system can be further returned to the evaporation system, so that deep purification is realized. Specifically, the RO system is connected to the pre-heating module to pre-heat the turbid water again before being introduced into the separation module. Further, the RO system is connected to a heat exchanger to mix the dirty water with the concentrate produced by the DTRO system for recirculation within the evaporation system. It should be noted that the recovery rate of the RO system can be selected from 75% to 90%, and in this embodiment, the recovery rate of the RO system is 80%.
In one embodiment, the evaporation system further comprises a steam generator connected to the separation chamber for providing steam to the separation chamber for initial start-up of the separation chamber, or when the steam in the separation chamber is insufficient to provide the energy required for preheating and circulating heating of the concentrated solution, the steam generator provides steam to the separation chamber to ensure smooth operation of the modules in the evaporation system.
Referring to fig. 1 and 2, the present invention further provides a method for treating landfill leachate wastewater, which comprises the following steps:
s100, introducing the landfill leachate wastewater into a pretreatment system for pretreatment to obtain filtrate and a first solid capable of being buried.
After the landfill leachate waste water is introduced into the pretreatment system, the pretreatment system can carry out pretreatment on the landfill leachate waste water so as to obtain filtrate and dehydrated first solid, wherein the first solid is dehydrated, so that the first solid can be directly discharged for burying without polluting the environment.
S200, introducing the filtrate into a DTRO system to perform reverse osmosis type filtration and separation to obtain a concentrated solution and first purified water which can be discharged outside.
And (3) after the filtrate generated in the S100 is introduced into the DTRO system, the DTRO system can concentrate the filtrate, and the concentrated solution and the first purified water which can be discharged outside are obtained by separation, so that the amount of the concentrated solution going to a subsequent evaporation system is reduced, the energy consumption is reduced, and the investment cost and the operation cost of the evaporation system are saved. In addition, the purity of the first purified water discharged by the DTRO system is high, and the first purified water is directly discharged outside without polluting the environment, so that zero discharge of pollutants is realized.
S300, introducing the concentrated solution into an evaporation system for evaporation and separation to obtain a second solid and distilled water.
And (3) introducing the concentrated solution generated in the step (S200) into an evaporation system, wherein the evaporation system can carry out heating evaporation separation on the concentrated solution, so that distilled water and a second solid can be separated, wherein the second solid only contains a small amount of water, and the distilled water is also collected and guided into an RO system.
And S400, introducing the second solid into a drying system for drying treatment, and then discharging to landfill.
And (3) introducing the second solid generated in the step (S300) into a drying system, wherein the drying system can evaporate and dry the second solid, so that the second solid does not contain moisture and can be directly discharged and buried without polluting the environment.
S500, introducing the distilled water into an RO system to perform reverse osmosis type filtration and separation to obtain second purified water and turbid water, wherein the second purified water is discharged outside, and the turbid water is introduced into an evaporation system.
And (3) introducing the distilled water generated in the S300 into an RO system, wherein the RO system can deeply purify the distilled water, so that the distilled water is separated to obtain second purified water and turbid water, the second purified water can be directly discharged without polluting the environment due to higher purity, and the turbid water is introduced into an evaporation system for continuous circulating evaporation.
According to the landfill leachate wastewater treatment method, the landfill leachate wastewater is sequentially subjected to pretreatment, concentration treatment, DTRO treatment, evaporation treatment, drying treatment and RO treatment, so that the finally discharged first solid and second solid can be directly buried, the environment cannot be polluted due to the fact that the first solid and the second solid do not contain moisture, the purity of the discharged first purified water and the second purified water is high, the first purified water and the second purified water can be normally used, the environment cannot be polluted, and the rest wastewater can be continuously circulated in a landfill leachate wastewater treatment system to realize solid-liquid separation. Therefore, the method for treating the waste water of the landfill leachate can realize the thorough treatment of the waste water of the landfill leachate, achieve better treatment effect and have no pollution to the environment.
In one embodiment, S100 further includes the following steps:
s110, controlling a medicament adding module to add medicaments into the adjusting coagulating sedimentation module and the middle filtering module;
s120, introducing the landfill leachate wastewater into an adjusting coagulating sedimentation module for mixing and sedimentation to obtain slurry and supernatant;
s130, guiding the slurry into a sludge concentration module for concentration to obtain concentrated slurry;
s140, introducing the concentrated slurry into a plate frame dehydration module for dehydration to obtain first solid and muddy water, wherein the first solid is discharged and then buried;
s150, introducing the muddy water and the supernatant into a middle filtering module for filtering to obtain a filtrate;
through adjusting in the pretreatment systems that the module is added to coagulating sedimentation module, sludge concentration module, sheet frame dehydration module, middle filtration module and medicament mutually supports to deposit the operation such as filtration, concentration, dehydration to the large granule thing in the landfill leachate waste water, with the concentration that reduces waste water. The first solid produced in S100 is dehydrated and can be directly discharged to landfill without affecting the environment.
In one embodiment, S300 further includes the following steps:
s310, introducing the concentrated solution into a preheating module for preheating;
s320, introducing the preheated concentrated solution into a separation chamber, and evaporating and separating the concentrated solution in the separation chamber to obtain steam;
s330, introducing the concentrated solution into a solid-liquid separator for solid-liquid separation to obtain a second solid and a circulating liquid, wherein the circulating liquid is introduced into a separation chamber;
s340, introducing steam into a circulating heating module to heat up to obtain high-temperature steam, and circularly heating the concentrated solution in the separation chamber by the high-temperature steam;
and S350, introducing the high-temperature carrier discharged by the circulating heating module into a preheating module to preheat the concentrated solution, and forming distilled water after the high-temperature carrier releases heat.
Concentrated solution is subjected to preheating treatment and then is introduced into the separation chamber, so that the concentrated solution is evaporated in the separation chamber to realize gradual concentration under the circulating heating action of the circulating heating module, and then is separated under the centrifugal separation action of the solid-liquid separator. The whole evaporation treatment process is reasonably designed to form a relatively perfect treatment process, so that finally obtained second solid can be discharged and buried after being dried by the drying system, and the separated distilled water can be subjected to advanced treatment by the RO system to obtain second purified water which can be discharged outside. And in the whole evaporation treatment process, steam obtained by separation in the separation chamber is introduced into the circulating heating module to be reused, high-temperature carriers discharged by the circulating heating module are further utilized in the preheating module, and circulating liquid obtained by separation in the solid-liquid separator is further returned to the separation chamber to be further evaporated and separated. Therefore, the evaporation treatment process is reasonable, the energy is effectively utilized, zero emission of pollutants is achieved, and the environment is not polluted.
Specifically, in S350, the high-temperature carrier discharged by the circulating heating module includes high-temperature steam and high-temperature distilled water, the high-temperature steam can be introduced into the exhaust condenser to heat the concentrated solution for the second time, the high-temperature distilled water formed after heat exchange with the concentrated solution in the separation chamber and the concentrated solution in the exhaust condenser can be introduced into the heat exchanger to heat the concentrated solution for the first time, and the low-temperature distilled water is obtained after heat exchange. Therefore, the low-temperature distilled water can be introduced into the RO system, and can be deeply purified in the RO system, so that a better purification effect is realized.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A landfill leachate wastewater treatment system is characterized by comprising a pretreatment system, a DTRO system, an evaporation system, an RO system and a drying system; the pretreatment system, the DTRO system and the evaporation system are connected in sequence; the pretreatment system is used for pretreating landfill leachate wastewater to obtain dehydrated first solid and filtrate, the DTRO system is used for treating the filtrate to obtain first purified water and concentrated solution, and the evaporation system is used for evaporating and separating the concentrated solution to obtain second solid and distilled water; the drying system is connected with the evaporation system to dry the second solid; the RO system is connected with the evaporation system to reprocess the distilled water to obtain second purified water and turbid water; the first solid and the second solid are discharged outwards and buried, the first purified water and the second purified water are discharged outwards, and the turbid water is introduced into the evaporation system for evaporation and separation again;
the evaporation system comprises a preheating module connected with the DTRO system, a separation module connected with the preheating module, and a circulating heating module connected with the separation module; the drying system is connected with the separation module; the preheating module comprises a heat exchanger and an exhaust gas condenser connected with the heat exchanger, the heat exchanger is connected with the DTRO system, and the exhaust gas condenser is connected with the separation module; and high-temperature distilled water generated by the circulating heating module is conveyed to the heat exchanger to heat the concentrated solution for the first time, and high-temperature steam generated by the circulating heating module is conveyed to the exhaust condenser to heat the concentrated solution for the second time.
2. The landfill leachate wastewater treatment system of claim 1, wherein the pretreatment system comprises a conditioning coagulation sedimentation module for performing sedimentation treatment on landfill leachate wastewater, a sludge concentration module connected with the conditioning coagulation sedimentation module, a plate-and-frame dehydration module connected with the sludge concentration module, an intermediate filtration module connected with the conditioning coagulation sedimentation module and the plate-and-frame dehydration module, and a chemical adding module for adding a chemical to the conditioning coagulation sedimentation module and the intermediate filtration module.
3. The landfill leachate wastewater treatment system of claim 1, wherein the landfill leachate wastewater treatment system comprises a transfer tank, the pretreatment system, the DTRO system, and the RO system are all integrated within the transfer tank; the evaporation system is of an integrated structure.
4. The landfill leachate wastewater treatment system of claim 1, wherein the drying system dries the second solid by spray drying.
5. The landfill leachate wastewater treatment system of claim 1, wherein the separation module comprises a separation chamber and a solid-liquid separator connected to the separation chamber, the preheating module and the circulating heating module are both connected to the separation chamber, and the solid-liquid separator is connected to the drying system.
6. The landfill leachate wastewater treatment system of claim 5, wherein the circulating heating module comprises a heater and a compressor, the compressor is connected with the separation chamber to compress and heat the steam led out from the separation chamber and then convey the steam to the heater; the heater is connected with the separation chamber to circularly heat the concentrated solution in the separation chamber; the heater is connected with the preheating module.
7. The landfill leachate waste water treatment system of claim 5, wherein the upper part of the separation chamber is provided with two layers of efficient demisting structures, the lower layer adopts a folded plate type demister, the upper layer adopts a wire mesh type demister, and the steam generated by evaporation in the separation chamber is extracted by the compressor after being fully demisted by controlling the liquid/steam separation area and the separation height, and is formed into high-temperature steam after being heated and pressurized by the compressor and then is led into the heater.
8. A landfill leachate wastewater treatment method, which adopts the landfill leachate wastewater treatment system of any one of the above claims 1 to 7 to perform landfill leachate wastewater treatment, and is characterized in that the landfill leachate wastewater treatment method comprises the following steps:
introducing the landfill leachate wastewater into a pretreatment system for pretreatment to obtain filtrate and a first solid capable of being buried;
introducing the filtrate into a DTRO system to perform reverse osmosis type filtration and separation to obtain a concentrated solution and first purified water which can be discharged;
introducing the concentrated solution into an evaporation system for evaporation and separation to obtain a second solid and distilled water;
introducing the second solid into a drying system for drying treatment and then discharging to landfill;
introducing the distilled water into an RO system to perform reverse osmosis type filtration and separation to obtain second purified water and turbid water, wherein the second purified water is discharged outside, and the turbid water is introduced into an evaporation system;
the step of introducing the concentrated solution into an evaporation system for evaporation and separation to obtain a second solid and distilled water further comprises the following steps:
introducing the concentrated solution into a preheating module for preheating;
introducing the preheated concentrated solution into a separation chamber, and evaporating and separating the concentrated solution in the separation chamber to obtain steam;
introducing the concentrated solution into a solid-liquid separator for solid-liquid separation to obtain a second solid and a circulating solution, wherein the circulating solution is introduced into a separation chamber;
introducing steam into a circulating heating module to heat up to obtain high-temperature steam, and circularly heating the concentrated solution in the separation chamber by the high-temperature steam;
introducing the high-temperature carrier discharged by the circulating heating module into a preheating module to preheat the concentrated solution, and forming distilled water after the high-temperature carrier releases heat;
the high-temperature carrier discharged by the circulating heating module comprises high-temperature steam and high-temperature distilled water, the high-temperature steam is introduced into the exhaust condenser to carry out secondary heating on the concentrated solution, the high-temperature distilled water formed after heat exchange is carried out on the concentrated solution in the separation chamber and the concentrated solution in the exhaust condenser is introduced into the heat exchanger to carry out primary heating on the concentrated solution, and the low-temperature distilled water is obtained after heat exchange is carried out.
9. The landfill leachate wastewater treatment method of claim 8, wherein the step of introducing the landfill leachate wastewater into the pretreatment system for pretreatment to obtain a filtrate and a first solid capable of being buried further comprises the steps of:
controlling a medicament adding module to add medicaments into the adjusting coagulating sedimentation module and the middle filtering module;
introducing the landfill leachate wastewater into an adjusting coagulating sedimentation module for mixed sedimentation to obtain slurry and supernatant;
guiding the slurry into a sludge concentration module for concentration to obtain concentrated slurry;
introducing the concentrated slurry into a plate frame dehydration module for dehydration to obtain first solid and muddy water, wherein the first solid is discharged and then buried;
and (4) introducing the muddy water and the supernatant into a middle filtering module for filtering to obtain a filtrate.
10. The landfill leachate wastewater treatment method according to claim 9, further comprising the following steps before the step of adding the chemical into the adjusting coagulation sedimentation module and the intermediate filtration module by the control chemical adding module: and (3) introducing the garbage leachate wastewater into the feed liquid pool for collection, and pumping the garbage leachate wastewater in the feed liquid pool into the adjusting coagulating sedimentation module through the feed liquid pump.
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| CN115007605B (en) * | 2022-08-08 | 2022-10-11 | 徐州芒原智能科技有限公司 | Garbage pretreatment collection device and use method thereof |
| CN116891272B (en) * | 2023-07-11 | 2024-01-09 | 湖南生命伟业环保科技股份有限公司 | Water-saving pipeline type circulating conveying direct drinking water supply system |
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