CN218931884U - Landfill leachate pretreatment system - Google Patents
Landfill leachate pretreatment system Download PDFInfo
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- CN218931884U CN218931884U CN202222852036.5U CN202222852036U CN218931884U CN 218931884 U CN218931884 U CN 218931884U CN 202222852036 U CN202222852036 U CN 202222852036U CN 218931884 U CN218931884 U CN 218931884U
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Abstract
The utility model discloses a landfill leachate pretreatment system, which belongs to landfill leachate pretreatment systems; the landfill leachate passes through the first reaction tank, the second reaction tank, the third reaction tank, the sedimentation tank, the buffer tank, the filter and the sludge treatment system, so that the removal effect of high COD, SS and hardness is obtained, and meanwhile, the energy utilization of the full-quantification treatment system of the landfill is improved.
Description
Technical Field
The utility model relates to the technical field of landfill sites, in particular to a landfill leachate pretreatment system.
Background
With the development of town, the landfill of household garbage becomes an important way for urban garbage disposal. The domestic garbage can generate garbage percolate containing a large amount of pollutants in the landfill process. The leachate of refuse landfill belongs to high-concentration and high-salinity organic wastewater. Generally speaking, the nitrogen concentration of the leachate ammonia of the old landfill is generally 3000-4000mg/L, and the COD is generally 6000-8000 mg/L; the COD content of the concentrated solution can even reach more than 15000 mg/L. Therefore, if the percolate is not properly treated, the surrounding environments such as underground water, surface water, soil and the like are seriously polluted, and water resource waste is caused.
The leachate pollutants of the landfill mainly comprise COD, ammonia nitrogen, hardness, alkalinity and a small amount of sulfides. In general, the advanced treatment process of the leachate of the landfill adopts a membrane process with NF+RO as a core, the produced water of the process meets the two discharge standards of the table of domestic landfill control standard GB16889-2008, and the concentrated solution produced by the system is subjected to recharging treatment. According to statistics, the concentration liquid generated by the membrane system accounts for about 8% -20% of the original liquid of the percolate, and long-term recharging is extremely easy to cause the accumulation of salt content and the rapid increase of organic matters and ammonia nitrogen concentration of the percolate. To solve this problem, landfills use a full-scale process of "pretreatment + evaporation". However, the pretreatment system has the problem of poor removal effect of COD, ammonia nitrogen and alkalinity no matter the leachate or the concentrate. The leachate pretreatment system mainly adopts a high-efficiency precipitation method to remove suspended matters and colloid particles in the wastewater, and a chemical precipitation method to remove hardness in the wastewater. Although the high-efficiency precipitation method can remove a large amount of SS in the wastewater, the removal capacity of COD and ammonia nitrogen is limited, and the treatment load of a subsequent treatment unit is large. In addition, the high-efficiency precipitation method has long residence time, large occupied area of treatment facilities and large civil engineering investment of the system. The chemical precipitation method utilizes an alkaline agent to reduce the hardness in the wastewater, but has very low removal rate of COD; if lime is used as the hardening agent, the system will produce a large amount of inorganic sludge.
Related technical schemes are disclosed after retrieval. For example, the utility model is entitled a method and system for pretreating landfill leachate (publication No. CN 113754151A). Ammonia nitrogen is removed through the regulating tank, the first pH regulating tank, the first coagulation reaction tank, the first flocculation reaction tank, the first inclined tube sedimentation tank, the second pH regulating tank, the deamination reaction tank, the second coagulation reaction tank, the second flocculation reaction tank, the second inclined tube sedimentation tank, the third pH regulating tank, the iron-carbon fixed bed, the third flocculation reaction tank and the third inclined tube sedimentation tank, and the chemical oxygen demand of the percolating liquid is reduced. However, the process principle is complex, the corresponding equipment flow is complex, substances such as magnesium oxide, sodium hydrophosphate and the like are added in the treatment process of the percolate, and secondary pollution to the percolate is possibly caused.
For this reason, it is necessary to propose a new percolate pretreatment system for obtaining the removal effect of high COD, SS and hardness.
Disclosure of Invention
Technical problem to be solved
The utility model aims at solving the technical problems of high equipment installation and operation cost in the prior art, namely a landfill leachate pretreatment system, which aims at the pretreatment method and system of landfill leachate in order to ensure the treatment effect, and the landfill leachate passes through a first reaction tank, a second reaction tank, a third reaction tank, a sedimentation tank and a sludge treatment system to obtain the removal effect of high COD and SS and the treatment effect of wastewater hardness.
Technical proposal
The utility model relates to a landfill leachate pretreatment system, which comprises a first reaction tank, a second reaction tank, a third reaction tank, a sedimentation tank and a sludge treatment system, wherein the first reaction tank comprises an alkali adding tank, a leachate inlet pipe is communicated with the first reaction tank, the first reaction tank is communicated with the second reaction tank through a first communication hole, and wastewater treated by the first reaction tank flows into the second reaction tank through the first communication hole; the second reaction tank comprises a flocculating agent adding tank, the second reaction tank is communicated with the third reaction tank through the second communication hole, and wastewater treated by the second reaction tank flows into the third reaction tank through the second communication hole; the third reaction tank comprises a coagulant aid adding tank, and an overflow port is arranged at the upper end close to one side of the sedimentation tank; the sedimentation tank is communicated with a sludge treatment system through a first sludge pipe; the water outlet of the sedimentation tank is communicated with the water outlet pipe.
The first reaction tank is provided with a first flue gas spray head, the third reaction tank is provided with a second flue gas spray head, and the second flue gas spray head is communicated with a flue of a landfill biogas torch through pipelines respectively.
The high-temperature flue gas generated by the methane torch in the landfill site is blown into the first reaction tank through the flue and the first flue gas nozzle to heat the wastewater, so that on one hand, the temperature of the wastewater is increased, the reaction rate of the first reaction tank can be accelerated, the growth of crystals such as calcium carbonate and magnesium hydroxide is facilitated, and the removal of scaling substances such as calcium and magnesium is effectively promoted; on the other hand, the CO in the waste gas can be recovered 2 Reducing the carbon emission of landfill leachate systems. Recovered CO 2 And the inorganic precipitate is generated by the reaction of the inorganic precipitate and calcium and magnesium ions in the wastewater under alkaline conditions, so that the hardness of the wastewater can be further removed.
High-temperature flue gas generated by the landfill biogas torch is blown into the third reaction tank through a flue and a second flue gas nozzle, and small amounts of high-temperature flue gas are blown into the third reaction tank to slightly stir the high-temperature flue gas, so that SS and COD in the wastewater are further removed.
Preferably, the second reaction tank further comprises a heater. The heater may be a jacket, coil, heat exchanger, or a combination thereof.
Preferably, the heater is a coil heater, the coil heater is provided with a coil water inlet and a coil water outlet, the coil water inlet is communicated with an evaporation unit in the landfill full-quantization system through a pipeline, and the coil water outlet is communicated with an evaporation water collecting pipe.
Preferably, the second reaction tank further comprises an aeration device, wherein the aeration device is positioned below the heater and is communicated with the aeration fan through a pipeline.
The full-quantification treatment system of the landfill site is used for evaporating high-temperature produced water as a heat source, a jacket, a coil pipe, a heat exchanger or a combination mode is adopted for heating the wastewater of the second reaction tank, and the aeration fan is used for aerating the wastewater, so that on one hand, the reaction rate can be accelerated, and the reaction time of the system can be shortened; on the other hand, the sludge flocs in the wastewater can be promoted to be agglomerated to form relatively compact large-particle inorganic flocs, so that the inorganic flocs can be quickly settled in a settling zone. The evaporation high-temperature produced water is used as a heat source, an external heat source is not required to be added, the heat of the evaporation system can be recovered, and meanwhile, the scale of the cooling tower of the evaporation system of the full-quantification treatment unit is reduced.
Preferably, the first reaction tank further comprises a gas collection hood and an exhaust gas tank.
Preferably, the adding port of the alkali adding tank is positioned at the upper part of the first reaction tank, the adding port of the flocculating agent adding tank is positioned at the upper part of the second reaction tank, and the adding port of the coagulant aid is positioned at the upper part of the third reaction tank.
Preferably, the alkali adding tank of the first reaction tank is arranged corresponding to the first flue gas nozzle; and/or the coagulant aid adding tank of the third reaction tank is arranged corresponding to the second flue gas nozzle (310).
Preferably, the first reaction tank is communicated with the second reaction tank through the first communication hole, and the level of the first flue gas nozzle is higher than that of the first communication hole.
Preferably, the alkali adding tank is a soda adding tank; the flocculant adding tank is a ferrous sulfate adding tank, and the coagulant aid adding tank comprises a PFS adding tank and a PAM adding tank.
Preferably, the first reaction tank is provided with a first pH meter for monitoring the pH value of the first reaction tank, and when the pH reaches a preset requirement, the addition is stopped.
Preferably, a third communication hole is formed in the upper part of one side, close to the buffer tank, of the sedimentation tank; a second pH meter is arranged on the buffer pool; the upper part of the buffer tank is provided with an acid adding tank, and preferably, the acid can be hydrochloric acid, sulfuric acid and the like. The pH value in the buffer pool is regulated by using a second pH meter arranged at the upper part to timely control the dosage of the additive,
preferably, the upper part of the buffer tank is communicated with the water inlet of the filter through a pipeline. The filter is communicated with the sludge treatment system through a second sludge pipe, and the water outlet of the filter is communicated with the water outlet pipe.
Technical effects
Compared with the prior art, the utility model has the beneficial effects that:
(1) According to the landfill leachate pretreatment system, the alkaline adding tank is arranged on the first reaction tank, and the high-temperature flue gas generated by the landfill biogas torch is sprayed into the first reaction tank through the first flue gas spray head, so that the high-temperature flue gas is adopted to heat and stir the wastewater, when the alkaline preparation in the alkaline adding tank is added into the first reaction tank, the pH value of the leachate can be quickly and uniformly regulated, and the quick generation of calcium and magnesium precipitates can be effectively promoted; the flocculant adding tank is arranged on the second reaction tank, so that the micro particles, metal ions and COD dispersed in the percolate can be further and effectively flocculated and precipitated on the basis of regulating the pH value; meanwhile, high-temperature flue gas in the torch enters the third reaction tank through the flue and heats the third reaction tank, when coagulant aid is added into the third reaction tank, the reaction dynamics of the coagulant aid and the wastewater are improved in the heating and stirring process of the high-temperature flue gas on the wastewater in the third reaction tank, the residual COD and SS in the wastewater are promoted to generate flocculation precipitation, and the generated precipitation is discharged to a sludge treatment system in the precipitation tank, so that COD and SS are effectively removed, and the hardness of the wastewater is reduced.
(2) According to the landfill leachate pretreatment system, the heater is arranged in the second reaction tank, so that the reaction rate can be accelerated, and the system reaction time can be shortened; on the other hand, the sludge flocs in the wastewater can be promoted to be agglomerated to form more compact large-particle inorganic flocs, so that the sewage treatment efficiency of the system is improved.
(3) According to the landfill leachate pretreatment system, the coil heater is arranged in the second reaction tank and is communicated with the evaporation unit in the full-quantization system, so that high-temperature water is evaporated to serve as a heat source, an external heat source is not required to be added, heat of the evaporation system can be recovered, and meanwhile, the scale of a cooling tower of the full-quantization treatment unit evaporation system is reduced.
Drawings
Fig. 1 is a schematic diagram of a system structure according to embodiment 1 of the present utility model.
Fig. 2 is a schematic diagram of a system structure according to embodiment 2 of the present utility model.
Fig. 3 is a schematic diagram of a system structure according to embodiment 3 of the present utility model.
Fig. 4 is a schematic diagram of a system structure according to embodiment 4 of the present utility model.
Description of the reference numerals:
100. a first reaction tank; 110. a first flue gas nozzle; 120. an alkali adding tank; 130. a first pH meter; 140. a percolate inlet pipe; 101. a first communication hole;
200. a second reaction tank; 210. an aeration device; 220. a heater; 221. a coiled pipe water inlet; 222. a coiled water outlet; 230. a flocculant adding tank; 240. an evaporation unit; 241. a water collecting pipe for evaporation; 250. an aeration fan; 201. a second communication hole;
300. a third reaction tank; 310. a second flue gas nozzle; 320. a PFS addition tank; 330. PAM addition tank; 301. an overflow port;
400. a sedimentation tank; 410. a first sludge pipe; 420. a water outlet cofferdam; 401. a third communication hole;
500. a buffer pool; 510. a second pH meter; 520. an acid addition tank;
600. a filter; 610. a water outlet pipe; 620. a second sludge pipe;
700. a sludge treatment system;
800. and (5) a flue.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model; moreover, the embodiments are not independent, and can be combined with each other as required, so that a better effect is achieved. All other embodiments, based on the embodiments of the utility model, which a person of ordinary skill in the art would obtain without inventive faculty, are within the scope of the utility model; the percolate according to the present utility model may be referred to as wastewater, and the treatment object according to the present utility model may be percolate or wastewater.
Example 1
As shown in fig. 1, the leachate pretreatment system of the landfill of the present utility model comprises a first reaction tank 100, a second reaction tank 200, a third reaction tank 300, a sedimentation tank 400 and a sludge treatment system 700; the first reaction tank 100, the second reaction tank 200, the third reaction tank 300 and the sedimentation tank 400 are sequentially arranged and communicated, wherein a first communication hole 101 is formed in the lower part of the first reaction tank 100, the first reaction tank 100 is communicated with the second reaction tank 200 through the first communication hole 101, wastewater treated by the first reaction tank 100 enters the second reaction tank 200 through the first communication hole 101, a second communication hole 201 is formed in the upper part of the second reaction tank 200, the second reaction tank 200 is communicated with the third reaction tank 300 through the second communication hole 201, and wastewater subjected to flocculation sedimentation treatment in the second reaction tank 200 enters the third reaction tank 300 through the second communication hole 201; the upper part of the third reaction tank 300 is provided with an overflow port 301, and wastewater treated by the third reaction tank 300 flows into the sedimentation tank 400 through the overflow port 301 and is subjected to sedimentation treatment in the sedimentation tank 400; the sedimentation tank 400 is communicated with the sludge treatment system 700 through the first sludge pipe 410, so that sediment generated by the sedimentation tank 400 is discharged to the sludge treatment system 700 through the first sludge pipe 410; in addition, the water outlet of the sedimentation tank 400 is communicated with the water outlet pipe 610, and the treated wastewater is discharged through the water outlet pipe 610. It should be noted that the first sludge pipe 410 is provided with a screw pump, which is not shown in the figure.
The first reaction tank 100 is communicated with the percolate inlet pipe 140, the first reaction tank 100 is provided with the alkali adding tank 120 and the first pH meter 130, and alkali, such as sodium carbonate, lime and the like, is arranged in the alkali adding tank 120, and can be specifically selected and adjusted according to the condition of the percolate; the first flue gas spray head 110 is arranged in the first reaction tank 100, the first flue gas spray head 110 is communicated with the flue 800 of the landfill biogas torch through a pipeline, high-temperature flue gas in the flue 800 of the landfill biogas torch is sprayed into the first reaction tank 100 through the first flue gas spray head 110, the high-temperature flue gas is adopted to heat and stir the wastewater, when the alkaline preparation in the alkaline adding tank 120 is added into the first reaction tank 100, the pH value of the leachate can be quickly and uniformly regulated, and the rapid generation of calcium-magnesium precipitates is effectively promoted; in some cases, the horizontal height of the first flue gas nozzle 110 is higher than the horizontal height of the first communication hole 101, so that the high-temperature flue gas sprayed by the first flue gas nozzle 110 has a better stirring effect.
The first reaction tank 100 is provided with a gas collecting hood and an exhaust gas recovery tank, which are not shown in the drawing. NH4 in wastewater + With OH - The ammonia gas generated by the system is collected through a gas collecting hood and is sent into an exhaust gas tank filled with dilute sulfuric acid through a suction pump, so that the ammonia gas is converted into ammonium sulfate for recycling.
The second reaction tank 200 of the present utility model is provided with a flocculant adding tank 230, and the flocculant adding tank 230 is filled with flocculant; the flocculant can be aluminum sulfate, aluminum chloride, ferric chloride and the like. In some cases, the flocculant addition tank 230 contains ferrous sulfate and Fe generated by hydrolysis of ferrous sulfate 2+ Further oxidation to Fe 3+ The hydrate has stronger adsorption flocculation activity, and particularly, ferrous hydroxide and ferric hydroxide colloid flocculating agent is generated after adding alkali to adjust the pH value, the flocculation capacity is far higher than that of ferric hydroxide colloid obtained by hydrolysis of common medicaments, and a large amount of tiny particles and metal ions dispersed in water body can be flocculatedThe son and organic macromolecules have good system COD and SS removal effect.
The third reaction tank 300 of the present utility model is provided with a coagulant aid adding tank including a PFS adding tank 320 and a PAM adding tank 330. A second flue gas nozzle 310 is arranged in the third reaction tank 300, and the second flue gas nozzle 310 is communicated with a landfill methane torch flue 800 through a pipeline; spraying high-temperature flue gas in the landfill biogas torch flue 800 into the second flue gas nozzle 310 through the second flue gas nozzle 310; the waste water is slightly stirred by a small amount of high-temperature flue gas, the sedimentation speed of sludge flocs can be increased under alkaline conditions, the flocs are promoted to be enlarged, COD and SS in the waste water are further adsorbed, and the removal effect of the COD and SS in the waste water is improved. In some cases, there are two coagulant addition tanks, each filled with PFS and PAM; in some cases, there may be only one coagulant addition tank.
Example 2
The heater 220 is provided on the second reaction tank 200 on the basis of example 1. The heater 220 may be a jacket, coil, heat exchanger, or a combination thereof; the second reaction tank further comprises an aeration device 210, the aeration device 210 is positioned at the bottom of the second reaction tank (200), and the aeration device 210 is communicated with an aeration fan 250 through a pipeline.
In some cases, the heater 220 is a coil heater provided with a coil water inlet 221 and a coil water outlet 222, the coil water inlet 221 being in communication with the water producing port of the evaporation unit 240 in the full-scale system via a pipe, the coil water outlet 222 being in communication with the evaporation produced water collection pipe 241.
The evaporation unit 240 of the full-quantification treatment system introduced into the landfill site heats the sewage, so that the reaction rate can be accelerated and the system reaction time can be shortened on the one hand; on the other hand, the sludge flocs in the wastewater can be promoted to be agglomerated to form relatively compact large-particle inorganic flocs, so that the inorganic flocs can be quickly settled in a settling zone. The landfill leachate contains a small amount of sulfide, ferrous sulfate is introduced into the system, and Fe in the wastewater 2+ With negatively charged S 2- Generating electric neutralization reaction to generate ferrous sulfide precipitate, generating ferric sulfide precipitate after air oxidation, and obtaining higher sulfide removal rate by the system.The evaporation high-temperature water is used as a heat source, an external heat source is not required to be added, the heat of the evaporation system can be recovered, and meanwhile, the scale of the cooling tower of the evaporation system of the full-quantification treatment unit is reduced.
By arranging the heater 220 and the aeration device 210 of the second reaction tank 200, the reaction time of the flocculant effect can be shortened, and the agglomeration of inorganic flocs of the second reaction tank 200 is promoted to generate large-particle compact sludge flocs.
Example 3
On the basis of embodiment 1, a buffer tank 500 is further disposed between the sedimentation tank 400 and the water outlet pipe 610, and a water outlet cofferdam 420 is disposed at the upper part in the sedimentation tank 400, for controlling the elevation of the water level in the sedimentation tank 400, and uniformly distributing the water outlet of the sedimentation tank 400. A third communication hole 401 is provided at an upper portion of one side close to the buffer tank 500, and the upper portion of the buffer tank 500 is communicated with a water inlet of the filter 600 through a pipe. In some cases, the sewage filtered by the filter 600 flows out of the water outlet pipe 610 to a subsequent treatment unit; sludge enters the sludge treatment system 700 from the second sludge pipe 620 under the influence of the screw pump. The second sludge pipe 620 is provided with a screw pump, not shown in the drawing.
In some cases, a second pH meter 510 is provided on the buffer tank 500 to adjust the wastewater to a requirement for drainage or to adjust according to a requirement for subsequent wastewater treatment; the addition port of the acid addition tank 520 is located at the upper portion of the buffer tank 500.
Example 4
On the basis of embodiment 2, a buffer tank 500 is further disposed between the sedimentation tank 400 and the water outlet pipe 610, and a water outlet cofferdam 420 is disposed at the upper part in the sedimentation tank 400, for controlling the elevation of the water level in the sedimentation tank 400, and uniformly distributing the water outlet of the sedimentation tank 400. A third communication hole 401 is provided at an upper portion of one side close to the buffer tank 500, and the upper portion of the buffer tank 500 is communicated with a water inlet of the filter 600 through a pipe. In some cases, the sewage filtered by the filter 600 flows out of the water outlet pipe 610 to a subsequent treatment unit; sludge enters the sludge treatment system 700 from the second sludge pipe 620 under the influence of the screw pump. The second sludge pipe 620 is provided with a screw pump, not shown in the drawing.
In some cases, a second pH meter 510 is provided on the buffer tank 500 to adjust the wastewater to a requirement for drainage or to adjust according to a requirement for subsequent wastewater treatment; the addition port of the acid addition tank 520 is located at the upper portion of the buffer tank 500.
It is noted that permeate inlet tube 140 may be in communication with first reaction cell 100 in place depending on the actual conditions, and variations may be made by one of ordinary skill in the art without inventive effort and are within the scope of the present utility model.
Claims (10)
1. A landfill leachate pretreatment system is characterized in that: comprises a first reaction tank (100), a second reaction tank (200), a third reaction tank (300), a sedimentation tank (400) and a sludge treatment system (700); the first reaction tank (100), the second reaction tank (200), the third reaction tank (300) and the sedimentation tank (400) are sequentially arranged and communicated, wherein
The first reaction tank (100) is communicated with the percolate water inlet pipe (140), the first reaction tank (100) is provided with an alkali adding tank (120), a first flue gas spray head (110) is arranged in the first reaction tank (100), and the first flue gas spray head (110) is communicated with a flue (800) of a landfill biogas torch through a pipeline;
the second reaction tank (200) is provided with a flocculant adding tank (230);
the third reaction tank (300) is provided with a coagulant aid adding tank, a second flue gas nozzle (310) is arranged in the third reaction tank (300), and the second flue gas nozzle (310) is communicated with a flue (800) of a landfill biogas torch through a pipeline;
the sedimentation tank (400) is communicated with the sludge treatment system (700) through a first sludge pipe (410); the water outlet of the sedimentation tank (400) is communicated with a water outlet pipe (610).
2. A landfill leachate pretreatment system according to claim 1, wherein: the second reaction cell (200) further comprises a heater (220).
3. A landfill leachate pretreatment system according to claim 2, wherein: the heater (220) is a coil heater, the coil heater is provided with a coil water inlet (221) and a coil water outlet (222), the coil water inlet (221) is communicated with a water producing port of the evaporation unit (240) through a pipeline, and the coil water outlet (222) is communicated with an evaporation water producing collecting pipe (241).
4. A landfill leachate pretreatment system according to claim 2 or 3, wherein: the second reaction tank (200) further comprises an aeration device (210), the aeration device (210) is located at the bottom of the second reaction tank (200), and the aeration device (210) is communicated with an aeration fan (250) through a pipeline.
5. A landfill leachate pretreatment system according to claim 1, wherein: the lower part of the first reaction tank (100) is provided with a first communication hole (101), and the first reaction tank (100) further comprises a gas collecting hood and an exhaust gas tank.
6. A landfill leachate pretreatment system according to claim 1, wherein: the alkali adding tank (120) is a soda adding tank, and a first pH meter (130) is arranged on the first reaction tank (100); the flocculant adding tank (230) is a ferrous sulfate adding tank; a second communication hole (201) is provided at the upper part of the second reaction tank (200).
7. A landfill leachate pretreatment system according to claim 1, wherein: the third reaction tank (300) is provided with a coagulant aid adding tank, the adding port of the coagulant aid adding tank is positioned above the third reaction tank (300), and the coagulant aid adding tank comprises a PFS adding tank (320) and a PAM adding tank (330).
8. A landfill leachate pretreatment system according to claim 1, wherein: the sedimentation tank also comprises a buffer tank (500), and a third communication hole (401) is formed in the upper part of one side, close to the buffer tank (500), of the sedimentation tank (400); a second pH meter (510) is arranged on the buffer tank (500); an acid addition tank (520) is provided at the upper part of the buffer tank (500).
9. A landfill leachate pretreatment system according to claim 8, wherein: the buffer tank (500) is characterized by further comprising a filter (600), wherein the upper part of the buffer tank (500) is communicated with a water inlet of the filter (600) through a pipeline;
the filter (600) is communicated with the sludge treatment system (700) through a second sludge pipe (620), and the water outlet of the filter (600) is communicated with the water outlet pipe (610).
10. A landfill leachate pretreatment system according to claim 1, wherein the inlet of the alkali adding tank (120) is located at the upper portion of the first reaction tank (100), and the inlet of the flocculant adding tank (230) is located at the upper portion of the second reaction tank (200).
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