CN113443758A - Full-quantitative pretreatment device, treatment system and treatment method for landfill leachate - Google Patents
Full-quantitative pretreatment device, treatment system and treatment method for landfill leachate Download PDFInfo
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- CN113443758A CN113443758A CN202110585891.1A CN202110585891A CN113443758A CN 113443758 A CN113443758 A CN 113443758A CN 202110585891 A CN202110585891 A CN 202110585891A CN 113443758 A CN113443758 A CN 113443758A
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
-
- 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
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention provides a garbage leachate full-quantification pretreatment device, which comprises an aeration zone, a precipitation zone and a water production zone, wherein the aeration zone is provided with a leachate inlet, the water production zone is provided with a clear water outlet, the garbage leachate full-quantification pretreatment device also comprises an electric flocculation zone and a gas dissolving zone, the aeration zone, the electric flocculation zone, the gas dissolving zone, the precipitation zone and the water production zone are sequentially communicated, electrodes are arranged in the electric flocculation zone, and a bubble generation assembly is arranged in the gas dissolving zone; also provides a processing system, comprising the pretreatment device; also provides a treatment method, which adopts the pretreatment device. According to the invention, the aeration zone, the electric flocculation zone, the dissolved air zone and the sedimentation zone are matched to effectively remove hardness, suspended matters and the like in water, improve the biodegradability of wastewater, limit the dosage of chemicals, reduce the sludge production, realize higher integration ratio, operate reliably and maintain conveniently.
Description
Technical Field
The invention relates to leachate treatment, in particular to a full-quantitative pretreatment device, a treatment system and a treatment method for landfill leachate.
Background
Landfill leachate composition is complicated, contains a large amount of dissolubility suspended solids, macromolecular organic matter to and calcium magnesium ion, if do not remove these substances at the anterior segment, will reduce biochemical system or membrane system throughput, this process is for waste water removes hard, and the method of removing hard is many, and the commonly used has chemical softening method, ion exchange softening method, membrane separation method, electromagnetism softening etc. as shown in the following table:
among the above methods, the ion exchange method, the membrane separation method, and the electromagnetic method have a limited range of application, so that the overall operation effect is poor, while the chemical softening method requires a large amount of chemicals, which is not only costly, but also generates large sludge and has a high operation strength.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a full-quantitative pretreatment device, a treatment system and a treatment method for landfill leachate, which are reliable in operation and low in leachate treatment cost.
The invention is realized by the following steps:
the invention provides a garbage leachate full-quantification pretreatment device which comprises an aeration zone, a precipitation zone and a water production zone, wherein the aeration zone is provided with a leachate inlet, the water production zone is provided with a clear water outlet, the garbage leachate full-quantification pretreatment device also comprises an electric flocculation zone and a gas dissolving zone, the aeration zone, the electric flocculation zone, the gas dissolving zone, the precipitation zone and the water production zone are sequentially communicated, electrodes are arranged in the electric flocculation zone, and a bubble generation assembly is arranged in the gas dissolving zone.
Further, the floating slag collecting device also comprises a standing area and a slag scraping assembly used for collecting floating slag at the liquid level of the standing area and the dissolved air area, and the dissolved air area is communicated with the settling area through the standing area.
Furthermore, a baffle plate extending to the lower part of the liquid level is arranged at the upper end of the standing area, a water inlet and a water outlet of the standing area are respectively positioned at two opposite sides of the baffle plate, and a scum collecting part of the scum scraping assembly and the water inlet of the standing area are positioned at the same side of the baffle plate.
Furthermore, the standing area is separated from the gas dissolving area through a vertically arranged partition plate, and a guide plate which obliquely extends upwards to one side of the standing area is arranged at the upper end of the partition plate.
Further, the upper end of the settling zone is provided with a dosing chamber, and the gas dissolving zone is communicated with the settling zone through the dosing chamber.
Further, still be provided with the draft tube in the settling zone, the draft tube intercommunication add the medicine room with the settling zone, just the vertical income of draft tube the liquid level below of settling zone.
Further, the bubble generation assembly comprises a water pipe and a dissolved air pump, the water pipe is communicated with the water generation area and the dissolved air area, and the dissolved air pump is arranged on the water pipe.
The device further comprises a shell, wherein the aeration zone, the electric flocculation zone, the dissolved air zone, the sedimentation zone and the water production zone are integrated in the shell; or the garbage leachate full-quantification pretreatment device further comprises a base, and the aeration zone, the electric flocculation zone, the air dissolving zone, the sedimentation zone and the water production zone are integrated on the base.
The embodiment of the invention also provides a landfill leachate treatment system, which comprises a filtering device and the full-quantization landfill leachate pretreatment device, wherein the water production area is communicated with the filtering device.
The embodiment of the invention also provides a method for treating the landfill leachate, the landfill leachate sequentially flows through an aeration zone, an electric flocculation zone, an air dissolving zone, a precipitation zone and a water producing zone, wherein the electric flocculation zone adsorbs colloids, particles and organic matters in the landfill leachate through generated polynuclear iron complex and ferric hydroxide, the air dissolving zone prepares air bubbles below the liquid level, and the landfill leachate after electric flocculation is adsorbed through the air bubbles.
The invention has the following beneficial effects:
in the invention, the landfill leachate firstly enters an aeration zone to oxidize sulfides in the liquid into elemental sulfur, and after the landfill leachate enters an electric flocculation zone, a polynuclear iron complex and ferric hydroxide are generated through reaction, both have strong flocculation capacity, and can adsorb colloids, particles, organic matters and the like in wastewater, a large amount of bubbles can be generated in a gas dissolving zone, the particles are adhered in the process that the bubbles float to the liquid surface, and after the liquid discharged from the gas dissolving zone enters a precipitation zone, a certain amount of medicament is added and the liquid is kept stand for precipitation, the upper layer of the precipitation zone is clear liquid and can be led into a water production zone. In the process, hardness, suspended matters and the like in water can be effectively removed, the biodegradability of wastewater is improved, the chemical input amount of a settling zone is very limited, the sludge production amount is small, and the operation cost is low. In addition, the pretreatment device is highly integrated, each treatment unit is automatically completed, the floor area is small, the operation is reliable, and the operation and the maintenance are convenient.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow diagram of a landfill leachate treatment system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a landfill leachate treatment system provided in an embodiment of the present invention;
fig. 3 is a schematic view of an overhead structure inside each processing unit of the landfill leachate fully-quantized pretreatment device provided by the embodiment of the present invention;
fig. 4 is a schematic view of a pipeline connection structure of the landfill leachate fully-quantized pretreatment device provided by the embodiment of the present invention;
fig. 5 is an integrated schematic view of a landfill leachate treatment system provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a device 1 for fully pretreating landfill leachate, for implementing pretreatment of landfill leachate, which includes an aeration zone 11, an electrocoagulation zone 12, an air dissolving zone 13, a settling zone 15, and a water producing zone 16, and the landfill leachate to be treated flows through the foregoing zones in sequence, thereby implementing pretreatment of the landfill leachate.
Referring to fig. 2 and 4, an embodiment of the present invention provides an aeration zone 11, specifically, a landfill leachate in a leachate storage tank is first introduced into the aeration zone 11, the time of the landfill leachate in the aeration zone 11 is controlled to be 0.5h, the aeration zone 11 is provided with an aerator, optionally a jet aerator, clear water is injected into the aeration zone 11 through the jet aerator, and the clear water actually forms a large number of micro bubbles after being acted by a solution air pump 171 and enters the aeration zone 11, which can oxidize sulfides in a liquid in the aeration zone 11 into elemental sulfur to prevent the sulfides from generating iron sulfide precipitates in a subsequent electrocoagulation zone 12, wherein the clear water can adopt clear water led out by a water production zone 16, that is, the water production zone 16 is connected with the aeration zone 11 by a pipeline, and the pipeline is provided with the solution air pump 171. And a sludge outlet is arranged at the bottom of the aeration zone 11, part of the generated sludge is discharged to a sludge concentration tank through the sludge outlet, and the treated liquid enters the electric flocculation zone 12.
Referring to fig. 2-4, the embodiment of the present invention provides an electrocoagulation region 12, the electrocoagulation region 12 is communicated with an aeration region 11, the electrocoagulation region 12 and the aeration region 11 can be separated by a partition board or a partition wall, water holes are arranged at the lower position of the middle of the partition board or the partition wall, and water in the aeration region 11 passes through the waterThe pores enter the electroflocculation zone 12. A polar plate is arranged in the electric flocculation zone 12, wherein the polar plate can be made of iron or aluminum and is used as an anode, and after the polar plate is electrified, the anode plate is used as a sacrificial anode to lose electrons under the action of an electric field and release Fe into liquid2+Or Al3+Then, through a series of hydrolysis, polymerization and oxidation processes, various hydroxyl complexes, polynuclear hydroxyl complexes or hydroxides are developed, so that colloidal impurities and suspended impurities in the wastewater are coagulated, precipitated and separated; meanwhile, the charged pollutant particles swim in the electric field, part of charges of the pollutant particles are neutralized by the electrodes to promote destabilization and coagulation, and Ca (OH) is generated2、Mg(OH)2、MgCO3And CaCO3Separating out to achieve the purpose of removing hardness; and OH generated by reaction on the surface of the anode plate has strong oxidation effect in the free radical state, can oxidize and decompose partial organic matters in water, and reduces the treatment load of a subsequent treatment unit. For the electroflocculation zone 12, the residence time of the liquid therein is 1h, in particular due to the generation of OH during electrolysis-And H2By controlling the residence time of the liquid, a large amount of OH is accumulated in the liquid-The liquid in the electric flocculation zone 12 is alkaline and Ca (OH) is generated2、Mg(OH)2Precipitating to form better hardness removing effect, and generating H2It floats up in the form of bubbles, which, of course, due to the limited production, can escape directly or be collected and disposed of exclusively. Aiming at the flocculation and precipitation, the lower end of the electric flocculation area 12 is arranged to be a sludge receiving hopper which is of a funnel structure, the bottom of the electric flocculation area is provided with a sludge outlet for collecting the flocculation and precipitation generated in the electric flocculation area, and the electric flocculation area can be discharged to a sludge concentration tank through the sludge outlet. In a preferred scheme, a compression pipeline is additionally arranged in the electric flocculation area 12, and compressed air can be blown into the electric flocculation area 12 periodically through the compression pipeline so as to realize the purpose of periodically flushing the anode plate and effectively prevent the surface of the anode plate from being passivated and scaled. Meanwhile, the direct current power supply corresponding to the electric flocculation area 12 is subjected to phase change at regular time, and the positive electrode and the negative electrode are exchanged at regular time, so that scaling and passivation of the polar plate are prevented.
Referring to fig. 2 and 4 again, the embodiment of the present invention provides an air dissolving zone 13, where the air dissolving zone 13 is the next processing unit of the electrocoagulation zone 12, and of course, it should be separated from the electrocoagulation zone 12, and it may be specifically separated by a partition board or a partition wall, and the communication position between the air dissolving zone 13 and the electrocoagulation zone 12 is the top end of the partition board or the partition wall, that is, the liquid in the electrocoagulation zone 12 overflows to the air dissolving zone 13 from the top end of the partition board or the partition wall. The bubble generation assembly 17 is arranged in the gas dissolving area 13, a large number of fine micro bubbles can be generated in the gas dissolving area 13 through the bubble generation assembly 17, and particulate matters in the liquid are adhered to the bubbles to float to the liquid level, namely, partial pollutants in the liquid are removed through the air floatation effect. Of course, a sludge outlet is also arranged at the bottom of the gas dissolving area 13, and the sediment deposited at the bottom of the gas dissolving area 13 can be discharged to a sludge concentration tank. The bubble generating assembly 17 mainly adopts a matching mode of clean water and a dissolved air pump 171, air is injected into the clean water through the dissolved air pump 171 to form bubbles, but the source of the clean water is similar to that of the aeration zone 11, the bubble generating assembly 17 comprises a water pipe 172 and the dissolved air pump 171, the water pipe 172 is communicated with the water producing zone 16 and the dissolved air zone 13, and the dissolved air pump 171 is arranged on the water pipe 172, namely, the clean water in the water producing zone 16 is used as the source of the bubbles. Of course, the aeration zone 11 and the air dissolving zone 13 may share the air dissolving pump 171, and the water pipe 172 is connected to the aeration zone 11 and the air dissolving zone 13 through two branches. In addition, the bubble generation assembly 17 further includes a delivery pipe 173 extending into the aeration zone 11 and the dissolved air zone 13, the delivery pipe 173 extends from top to bottom, a plurality of sets of releasers 174 are disposed thereon, each set of releasers 174 is sequentially spaced along the corresponding delivery pipe 173 along the vertical direction, generally, three sets of releasers can be disposed, which are divided into an upper set, a middle set and a lower set, of course, all three sets of releasers 174 should be located below the liquid level, each releaser 174 has a plurality of bubble holes, each bubble hole of each releaser 174 is sequentially disposed along the circumferential direction of the delivery pipe 173, and the outlet direction of the bubble holes is obliquely downward, so that the discharged bubbles can be distributed relatively uniformly in the aeration zone 11 and the dissolved air zone 13.
Referring to fig. 2, in a preferred embodiment of the gas dissolving area 13, a scum scraping assembly 18 is arranged above the gas dissolving area 13, scum and oil on the liquid level in the gas dissolving area 13 can be collected through the scum scraping assembly 18, the scum and oil collected by the scum scraping assembly 18 can be conveyed to an oil storage area, the oil storage area stays for 6 hours and is discharged through an oil discharge pump, and the oil storage area is provided with a drop-in online liquid level meter which is interlocked with the oil discharge pump. A slag scraper can be used for the slag scraping assembly 18, and the scum and oil on the liquid surface of the dissolved air zone 13 are scraped by the slag scraper.
With continued reference to fig. 2, the liquid in the gas dissolving zone 13 can flow into the settling zone 15, and the settling and purification of the liquid can be accelerated in the settling zone 15 by adding the medicament, but in the preferred embodiment, a standing zone 14 is added between the gas dissolving zone 13 and the settling zone 15, and the liquid in the gas dissolving zone 13 firstly flows into the standing zone 14 and then enters the settling zone 15 from the standing zone 14. The bubbles generated in the electrocoagulation region 12 and the gas dissolving region 13 can not float up quickly, and part of the bubbles still overflow to the next processing unit in the floating up process, so that the floating up time of the bubbles can be increased through the standing region 14, and suspended matters in the liquid can be carried to the liquid surface by the bubbles. The standing area 14 and the gas dissolving area 13 are separated by a partition or a partition wall, the two areas are communicated with each other at the upper end of the partition or the partition wall, and a guide plate 131 extending obliquely and upwardly towards the standing area 14 is arranged at the upper end of the partition or the partition wall, of course, the guide plate 131 should be positioned below the liquid level of the standing area 14 and the gas dissolving area 13, that is, the liquid in the gas dissolving area 13 overflows towards the standing area 14 from the top of the guide plate 131, and the oblique arrangement mode of the guide plate 131 can play a role in guiding the flow. For the processing function of the rest area 14, the above-mentioned scum unit 18 should also correspond to the rest area 14, i.e. the scum unit 18 should also collect the scum and oil on the surface of the rest area 14, i.e. the scum collecting part of the scum unit 18 can cross the liquid level of the scum area 13 and the rest area 14. Of course, the suspended matters with light specific gravity are carried to the liquid level through the air bubbles and are collected to the oil storage area by the residue scraping assembly 18, and particulate matters with high specific gravity and the like can automatically precipitate and accumulate at the bottom of the standing area 14, so that a sludge outlet is also arranged at the bottom of the standing area 14, and the sediments accumulated at the bottom of the standing area 14 are discharged to a concentrated sludge tank through the sludge outlet.
Continuing to optimize the structure of the standing zone 14, a baffle 141 is further arranged in the standing zone 14, the baffle 141 vertically extends from top to bottom, at least part of the structure of the baffle 141 extends to the position below the liquid level of the standing zone 14, namely, the liquid level of the standing zone 14 is divided into two parts by the baffle 141, the water inlet and the water outlet of the standing zone 14 are respectively located on two opposite sides of the baffle 141, and the baffle 141 is close to one side of the water outlet of the standing zone 14. The district 14 that stews mainly is that one side come-up bubble that is close to solution district 13 is more, pile up the scum layer easily at the liquid level that is close to solution district 13 department promptly, through addding baffle 141 in this embodiment, make liquid level dross concentrate on baffle 141 and be close to one side of solution district 13, it can not flow to the opposite side of baffle 141, baffle 141 can play the pushing off slag effect promptly, the dross of scraping sediment subassembly 18 of course is collected the position and is located the one side that baffle 141 corresponds the water inlet, and then can guarantee that the liquid that flows into settling zone 15 can not contain a large amount of dross. The size of the standing area 14 is larger than that of the electrocoagulation area 12 and the gas dissolving area 13, which is equivalent to increasing the distance from the water inlet to the water outlet of the liquid in the standing area 14, so that the bubbles can float up to the liquid level on one side of the baffle 141, that is, scum and oil in the standing area 14 are controlled to be accumulated on one side of the baffle 141 (the side of the baffle close to the water inlet).
Referring to fig. 2 and 3, an embodiment of the present invention further provides a settling zone 15, wherein liquid flowing in from the dissolved air zone 13 or the standing zone 14 enters the settling zone 15, a sludge receiving hopper and a sludge outlet are arranged at the bottom of the settling zone 15, the sludge receiving hopper is in a bucket structure, the sludge outlet is located at the bottom of the sludge receiving hopper, and the sludge in the settling zone 15 is accumulated in the sludge receiving hopper and can be discharged to a sludge concentration tank through the sludge outlet, and the sludge receiving hopper and the sludge outlet can be provided in plurality according to the size of the settling zone 15; and an effluent weir 155 is arranged at the upper end of the settling zone 15, and the supernatant in the settling zone 15 flows into the water production zone 16 through the effluent weir 155. In a preferred embodiment, the settling zone 15 employs chemical precipitation, i.e. chemical agents, such as PAM (polyacrylamide) and lye, are added into the liquid flowing from the standing zone 14, wherein PAM can adsorb suspended particles in the liquid, bridges are connected between particles, fine particles form large floccules to accelerate the precipitation, and lye can further separate out Ca in the liquid2+、Mg2+And the formed precipitate is accumulated in a mud collecting hopper.
Referring to fig. 2 and 4, the precipitation zone 15 is optimized, a dosing chamber 151 is arranged in the precipitation zone 15, the gas dissolving zone 13 is communicated with the precipitation zone 15 through the dosing chamber 151, or the standing zone 14 is communicated with the precipitation zone 15 through the dosing chamber 151, that is, liquid discharged from the gas dissolving zone 13 or the standing zone 14 firstly enters the dosing chamber 151 and then is guided into the precipitation zone 15 through the dosing chamber 151. Set up PAM agitator tank and liquid caustic soda agitator tank adding medicine room 151, wherein add PAM in the PAM agitator tank, and stir through PAM dispensing stirrer to make intensive mixing between PAM and the liquid, add alkali lye in the alkali lye agitator tank, and make intensive mixing between alkali lye and the liquid through alkali lye mixing stirrer, wherein the alkali lye agitator tank sets up the pH meter, adds the dosing pump interlock with liquid caustic soda, adjusts liquid caustic soda dosing through the monitoring pH of intaking. Therefore, a PAM dispensing chamber 153 and an alkali liquor dispensing chamber 153 can be additionally arranged, and the medicines dispensed by the two dispensing chambers 153 are conveyed to the corresponding stirring tanks through pipelines. The liquid after being added with medicine through the medicine adding chamber 151 is guided into the settling zone 15 through the guide cylinder 152 arranged in the settling zone 15, namely the guide cylinder 152 is communicated with the medicine adding chamber 151 and the settling zone 15, and the guide cylinder 152 vertically extends into the lower part of the liquid level of the settling zone 15. In a preferred embodiment, a flow baffle 154 is disposed just below the outlet of the guide cylinder 152, a gap is formed between the flow baffle 154 and the guide cylinder 152, and the distance between the flow baffle 154 and the guide cylinder 152 is not too large, the area of the flow baffle 154 is larger than the aperture of the outlet of the guide cylinder 152, the liquid discharged from the guide cylinder 152 flows from the gap between the guide cylinder 152 and the flow baffle 154 to the periphery, and meanwhile, the liquid discharged from the guide cylinder 152 can be prevented from impacting the sediment accumulated at the bottom of the sedimentation tank, and one surface of the flow baffle 154 facing the guide cylinder 152 is a conical surface, i.e., the thickness of the flow baffle 154 is smoothly reduced from the middle to the periphery, thereby forming a flow guiding effect.
The water producing area 16 is mainly used for storing clear water after precipitation, a water inlet buffering effect is provided for a subsequent process, and clear water in the water producing area 16 enters the filtering device 3 for continuous examination and nursing. The retention time of the water production area 16 is 30min, and the water production area 16 is provided with a drop-in type online liquid level meter which is interlocked with a water production pump.
Referring to fig. 1, fig. 2 and fig. 5, the apparatus 1 for fully pretreating landfill leachate according to the embodiment of the present invention further includes a housing, and the aeration zone 11, the electrocoagulation zone 12, the dissolved air zone 13, the standing zone 14, the settling zone 15 and the water production zone 16 are integrated in the housing. Through this kind of structure, integrated as a whole with each processing unit, form whole equipment, each processing unit all is located this casing, is provided with inlet and liquid outlet from this on the casing, and filtration liquid storage tank and inlet intercommunication, next processing unit then can be connected to the liquid outlet, for example filter equipment 3, continue to filter the clear water in producing water district 16 through filter equipment 3. Of course, in another embodiment, the apparatus 1 for fully pretreating landfill leachate further comprises a base 2, wherein the above treatment units are integrated on the base 2, and a certain seal is formed at the upper end of each treatment unit, for example, the aeration zone 11, the electrocoagulation zone 12, the dissolved air zone 13, the standing zone 14, the sedimentation zone 15 and the water production zone 16 are all independent tank structures, and adjacent treatment units are communicated with each other, or the dissolved air zone 13 and the standing zone 14 are integrated in the same tank, and the interior of the tank is separated by a partition plate. In addition, in order to facilitate maintenance, a stair 4 is disposed on the housing or the base 2, the stair 4 can extend from the bottom of the housing or the base 2 to the upper end of each processing unit, and electrical components of each processing unit are integrated into the electrical cabinet 21, and the electrical cabinet 21 is mounted on the housing or the base 2.
Referring to fig. 2 and fig. 5, an embodiment of the present invention further provides a landfill leachate treatment system, which includes a filtering device 3 and the above landfill leachate full-scale pretreatment device 1, and the water production area 16 is communicated with the filtering device 3. The filter device 3 comprises a multi-media filter 31 and a micro-filtration device 32, wherein the multi-media filter 31 promotes small suspended particles to form large particles by utilizing the cocurrent flocculation of the suspended particles in gaps of a filter layer in the deep-bed filtration process, so that the large particles are easy to remove, the filter material of the multi-media filter 31 consists of anthracite and quartz sand, and the anthracite with the relative density of 1.4-1.87 and large particle size is arranged on the upper layer; the quartz sand with small grain diameter and the relative density of about 2.6 is arranged at the lower layer, the multi-medium filter 31 is provided with positive flushing and back flushing capabilities, and flushing is periodically and automatically switched through a pneumatic valve (or an electric valve); the microfiltration device 32 is an external pressure type hollow fiber membrane, one end of the fiber membrane is fixed, the other end of the fiber membrane hangs freely, the defects of fast pollution and low flux of a dead-end filtration (both ends are fixed) membrane can be avoided, and the microfiltration device 32 is configured with acid washing, alkali washing, sodium hypochlorite washing and backwashing. The microfiltration device 32 is operated for 10 minutes and backwashed for 1 minute or operated for 20 minutes and backwashed for 2 minutes, and water is produced and cleaned at the same time, so that the stable water production of the system is ensured. In addition, according to the on-site water quality condition, the produced water in the water production area 16 can only pass through the multi-media filter 31 and exceed the microfiltration device 32 to directly enter the next system, also can exceed the multi-media filter 31 and directly enter the microfiltration device 32, can sequentially pass through the multi-media filter and enter the microfiltration device 32, and the three operation modes can be freely switched. Of course, the filtering device 3 can also be integrated on the housing or the base 2, so as to further improve the integration level of the landfill leachate treatment system.
Referring to fig. 1 and fig. 2, an embodiment of the present invention further provides a landfill leachate treatment method, in which, by using the above landfill leachate full-scale pretreatment apparatus 1, the landfill leachate sequentially flows through an aeration zone 11, an electrocoagulation zone 12, an air dissolving zone 13, a standing zone 14, a settling zone 15, and a water producing zone 16, wherein the electrocoagulation zone 12 adsorbs colloids, particles, and organic matters in the landfill leachate through the generated polynuclear iron complex and ferric hydroxide, and the air dissolving zone 13 prepares air bubbles below the liquid level, and adsorbs the electrocoagulated landfill leachate through the air bubbles. In this embodiment, adopt foretell landfill leachate full-quantization preprocessing device 1 to handle the filtration liquid in proper order, application scope is wide, and the medicament dosage is few, and the mud production volume is few, and the running cost is also low, can effectively get rid of aquatic hardness, suspended solid etc. to improve the biodegradability of handling liquid, provide favorable condition for follow-up biochemical system, guarantee follow-up technology steady operation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a landfill leachate full-quantization preprocessing device, includes aeration zone, settling zone and produces the water zone, just the aeration zone is provided with the filtration liquid import, it is provided with clear water export, its characterized in that to produce the water zone: the device comprises an aeration zone, an electric flocculation zone, an air dissolving zone, a sedimentation zone and a water producing zone, and is characterized by further comprising the electric flocculation zone and the air dissolving zone, wherein the aeration zone, the electric flocculation zone, the air dissolving zone, the sedimentation zone and the water producing zone are sequentially communicated, electrodes are arranged in the electric flocculation zone, and a bubble generating assembly is arranged in the air dissolving zone.
2. The fully-quantized pretreatment device of landfill leachate according to claim 1, wherein: the floating slag collecting device also comprises a standing area and a slag scraping assembly used for collecting floating slag at the liquid level of the standing area and the gas dissolving area, wherein the gas dissolving area is communicated with the settling area through the standing area.
3. The landfill leachate fully quantitative pretreatment device of claim 2, wherein: a baffle plate extending to the lower part of the liquid level is arranged at the upper end of the standing area, a water inlet and a water outlet of the standing area are respectively positioned at two opposite sides of the baffle plate, and a scum collecting part of the scum scraping assembly and the water inlet of the standing area are positioned at the same side of the baffle plate.
4. The landfill leachate fully quantitative pretreatment device of claim 2, wherein: the standing area is separated from the gas dissolving area through a vertically arranged partition plate, and a guide plate which obliquely and upwards extends towards one side of the standing area is arranged at the upper end of the partition plate.
5. The fully-quantized pretreatment device of landfill leachate according to claim 1, wherein: the upper end of the settling zone is provided with a dosing chamber, and the gas dissolving zone is communicated with the settling zone through the dosing chamber.
6. The landfill leachate fully quantitative pretreatment device of claim 5, wherein: the sedimentation zone is internally provided with a guide cylinder which is communicated with the dosing chamber and the sedimentation zone and vertically extends into the position below the liquid level of the sedimentation zone.
7. The fully-quantized pretreatment device of landfill leachate according to claim 1, wherein: the bubble generation assembly comprises a water pipe and a dissolved air pump, the water pipe is communicated with the water generation area and the dissolved air area, and the dissolved air pump is arranged on the water pipe.
8. The fully-quantized pretreatment device of landfill leachate according to claim 1, wherein: the device also comprises a shell, wherein the aeration zone, the electric flocculation zone, the air dissolving zone, the sedimentation zone and the water production zone are integrated in the shell; or the garbage leachate full-quantification pretreatment device further comprises a base, and the aeration zone, the electric flocculation zone, the air dissolving zone, the sedimentation zone and the water production zone are integrated on the base.
9. The utility model provides a landfill leachate processing system, includes filter equipment, its characterized in that: the full-scale pretreatment device for the landfill leachate according to any one of claims 1 to 8, wherein the water production area is communicated with the filtering device.
10. A method for treating landfill leachate is characterized by comprising the following steps: the landfill leachate flows through an aeration zone, an electric flocculation zone, an air dissolving zone, a settling zone and a water producing zone in sequence, wherein the electric flocculation zone adsorbs colloid, particles and organic matters in the landfill leachate through generated polynuclear iron complex and ferric hydroxide, the air dissolving zone prepares bubbles below the liquid level, and the landfill leachate after electric flocculation is adsorbed through the bubbles.
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