CN215559586U - Movable integrated landfill leachate treatment system - Google Patents

Movable integrated landfill leachate treatment system Download PDF

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CN215559586U
CN215559586U CN202120080272.2U CN202120080272U CN215559586U CN 215559586 U CN215559586 U CN 215559586U CN 202120080272 U CN202120080272 U CN 202120080272U CN 215559586 U CN215559586 U CN 215559586U
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tank
sludge
water
treatment
landfill leachate
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谢小青
戴兰华
黄珍艺
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Xiamen Shuihui Environmental Technology Co ltd
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Xiamen Shuihui Environmental Technology Co ltd
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Abstract

The utility model discloses a movable integrated landfill leachate treatment system, which consists of a container capable of being hoisted and a landfill leachate treatment system integrated in the container, and is mainly used for treating fresh landfill leachate generated by a refuse transfer station; the landfill leachate treatment system comprises a lime coagulating sedimentation device, a struvite precipitation deamination and denitrification device, an electrolysis purification device and a sludge treatment device, wherein the sludge treatment device is respectively connected with the lime coagulating sedimentation device and the electrolysis purification device. The mobile integrated landfill leachate treatment system disclosed by the utility model is used for treating the landfill leachate of the landfill transfer station, the indexes of main pollutants of effluent meet the municipal sewage intake pipe requirement, and the problem that the existing landfill transfer station does not have appropriate landfill leachate treatment equipment and technology is solved.

Description

Movable integrated landfill leachate treatment system
Technical Field
The utility model relates to a treatment system for landfill leachate, in particular to a treatment and ammonia nitrogen recovery system for fresh landfill leachate generated by a movable integrated refuse transfer station, belonging to the field of environmental protection.
Background
The landfill leachate is a liquid seeped by temporarily stacking garbage in a garbage landfill or a garbage transfer station, is high-ammonia nitrogen high-concentration organic wastewater which is difficult to treat and mainly comes from the following three aspects: 1. natural rainfall and runoff in the landfill; 2. the water content of the garbage itself; 3. water released by decomposition of microorganisms after landfill; with precipitation in the landfill being the major component. Typical values of the pollutant content of municipal landfill leachate are shown in table 1.
TABLE 1 general landfill leachate principal Components (except for pH and sensory index, in mg/L)
Item Range of concentration variation Item Range of concentration variation
Sensory index Black/malodor Chloride compound 189~3262
pH value 7.7~9.5 Fe 50~600
Total hardness 3000~10000 Cu 0.1~1.43
CODCr 1200~60000 Ca 200~300
BOD5 200~19000 Pb 0.1~2.0
NH3-N 20~7400 Cr 0.01~2.61
Total phosphorus 1~70 Hg 0~0.032
As can be seen from table 1, the quality of landfill leachate has the following basic characteristics: first, the concentration of contaminants is high, ammonia nitrogen, COD and BOD5Most of the industrial pollutants are dozens to hundreds of times of the national emission standard of the industrial pollutants; secondly, the pollution-free environment-friendly paint contains organic pollution components, inorganic pollution components and trace heavy metal pollution components, and has obvious comprehensive pollution characteristics; and thirdly, the proportion of the microbial nutrient elements in the leachate is seriously imbalanced, the ammonia nitrogen concentration is very high, the C/N ratio is imbalanced, the nutrient proportion is far away from that required by the growth of microorganisms during the biological treatment, and certain difficulty is brought to the biological treatment.
The ammonia nitrogen content and the COD concentration of the landfill leachate are high, so that the ground water body is anoxic and the water quality is deteriorated; the nutrient substances such as nitrogen and phosphorus are the causes of water eutrophication, and can also seriously affect the drinking water source; generally speaking, COD, BOD5,BOD5the/COD decreases with "age" of the landfill and the alkalinity content increases. In addition, with the increase of the stacking age, the fresh garbage is gradually changed into the stale garbage, the content of organic matters in the percolate is reduced to some extent, but the content of ammonia nitrogen is increased, and the biodegradability is reduced, so the treatment difficulty is very high.
The key point for treating the landfill leachate is the treatment of COD and ammonia nitrogen, in particular to the treatment of ammonia nitrogen. The existing mainstream technology comprises the steps of pretreatment, flocculation precipitation, biochemical treatment, chemical strong oxidation, MBR, ultrafiltration, nanofiltration, reverse osmosis and the like, and combines the means of physicochemical treatment and biological treatment. Similarly, the landfill leachate disclosed in CN1478737 is a combined treatment of physical and chemical treatment and biological treatment, in which the leachate after electrolytic oxidation treatment is subjected to reverse osmosis treatment by using ceramic membrane. The technology achieves certain effect on treating the landfill leachate, but has the following outstanding problems:
1. in China, except for the warm climate in coastal areas of southeast, low temperature exists in winter in most areas, when the water temperature is lower than 15 ℃, the activity of nitrifying bacteria in a garbage leachate treatment facility is greatly reduced, the nitrification effect is poor, the ammonia nitrogen concentration of biochemical effluent reaches 500-1000 mg/L, some ammonia nitrogen is even higher, and the ammonia nitrogen cannot be eliminated by subsequent membrane treatment, so the ammonia nitrogen of the effluent seriously exceeds the standard;
2. the existing garbage leachate treatment process combining biochemistry and membrane filtration technology has membrane treatment comprising MBR, ultrafiltration, nanofiltration and reverse osmosis, long treatment process, more investment, more operation posts and high operation cost, and particularly about 30 percent of concentrated solution can only be re-filled into a landfill site except evaporation treatment, so that salt is continuously accumulated, the salt content of leachate is higher and higher, if evaporation treatment is adopted, the operation cost of the concentrated solution treatment reaches 150-200 yuan/ton, and the concentrated solution treatment is distributed to reach more than 45 yuan/ton per ton of garbage leachate.
3. After the leachate of most landfill sites is treated, the subsequent membrane process treatment is disturbed by the high ammonia nitrogen in the MBR effluent, and meanwhile, the waste of ammonia nitrogen resources is caused.
In addition, the current landfill leachate treatment devices are mainly used for landfill leachate treatment of landfill sites, and lack treatment devices for characteristics of fresh landfill leachate generated by a landfill transfer station. The existing landfill leachate treatment equipment and production process are long in flow, multiple in equipment, complex in operation and operation, and need to be operated and managed by very specialized personnel, and are not suitable for the specific situations that a landfill transfer station is multiple in sites, leachate at a single site is less, the concentration of main pollutants is lower compared with that of landfill leachate in a landfill, and the specialized personnel are relatively lacked, so that treatment equipment and treatment technology for fresh leachate of the landfill transfer station are urgently needed to solve the problem of landfill leachate treatment of the transfer station.
Disclosure of Invention
The utility model aims to overcome the defects of complex treatment process, large chemical agent consumption, high cost, substandard discharge of the treated landfill leachate, no special treatment equipment for the landfill leachate of a refuse transfer station and the like in the conventional landfill leachate treatment technology, and combines the lime precipitation and struvite method for recovering ammonia nitrogen, the coagulating precipitation and the electrolytic purification to make up for the deficiencies of each other so as to form a mobile integrated landfill leachate treatment system for treating fresh landfill leachate of the refuse transfer station.
The utility model is realized by the following technical scheme: a movable integrated garbage leachate treatment system comprises a container and a garbage leachate treatment system integrated in the container, wherein the garbage leachate treatment system comprises a lime coagulating sedimentation device, a struvite precipitation deamination and denitrification device, an electrolysis purification device and a sludge treatment device, the sludge treatment device is respectively connected with the lime coagulating sedimentation device and the electrolysis purification device,
the lime coagulating sedimentation device consists of a garbage leachate collecting and adjusting tank, a chemical feeding tank, a reaction tank, a sedimentation tank and a supernatant storage tank, wherein a water inlet of the reaction tank is connected with a water outlet of the garbage leachate collecting and adjusting tank, a water outlet of the reaction tank is connected with a water inlet of the sedimentation tank, a supernatant water outlet of the sedimentation tank is connected with a water inlet of the supernatant storage tank, a sludge outlet of the sedimentation tank is connected with a sludge concentration tank, and a water outlet of the supernatant storage tank is connected with the struvite precipitation deamination nitrogen removal device;
the struvite precipitation deamination and denitrification device consists of a struvite precipitation reaction kettle, a magnesium salt solution storage tank, a phosphate solution storage tank, a precipitation separation tank, an intermediate water tank and a struvite precipitation concentration tank; the magnesium salt solution storage tank and the phosphate solution storage tank are respectively connected with the struvite precipitation reaction kettle; the water inlet of the struvite precipitation reaction kettle is connected with the water outlet of the supernatant storage tank, the water outlet of the struvite precipitation reaction kettle is connected with the water inlet of the precipitation separation tank, the water outlet of the precipitation separation tank is connected with the water inlet of the intermediate water tank, and the precipitation outlet of the precipitation separation tank is connected with the struvite precipitation concentration tank through a valve;
the electrolytic purification device comprises an electrolytic machine, a direct current and a degassing tank, wherein a water inlet of the electrolytic machine is connected with a water outlet of the intermediate water tank, a water outlet of the electrolytic machine is connected with a water inlet of the degassing tank, a water outlet of the degassing tank is connected with a municipal sewage pipe network, and a water outlet pipe of the degassing tank is also provided with a circulating water pump which is connected with a water inlet pipe of the electrolytic machine;
the sludge treatment device comprises a sludge pump, a sludge concentration tank, a physicochemical conditioning tank and a dehydrator, wherein the inlet of the sludge pump is respectively communicated with the sludge outlets of the lime coagulation sedimentation device and the electrolytic purification device, the outlet of the sludge pump is communicated with the inlet of the sludge concentration tank, the sludge outlet of the sludge concentration tank is communicated with the inlet of the physicochemical conditioning tank, and the sewage outlet of the sludge concentration tank is communicated with the water inlet of the lime coagulation sedimentation device; the outlet of the physicochemical conditioning pool is communicated with the sludge inlet of the dehydrator, and the sewage of the dehydrator is communicated with the water inlet of the lime coagulating sedimentation device.
Compared with the prior art, the utility model has the following obvious advantages:
1. the device can flexibly move according to the requirement of the garbage transfer station, is suitable for treating fresh garbage percolate of the garbage transfer station with daily-produced garbage percolate less than 50 tons, and solves the problem that the existing garbage transfer station has no proper garbage percolate treatment device and technology, and the index of main pollutants of effluent meets the municipal sewage nano-tube requirement;
2. the high-concentration ammonia nitrogen in the leachate is recovered by adopting a struvite precipitation method, so that the ammonia nitrogen treatment problem of the landfill leachate is solved, and the slow-release fertilizer struvite is obtained, so that the ammonia nitrogen resource is fully utilized, and the industrial policy of national waste resource utilization is met;
3. the 'MBR + UF + NF + RO' process after the biochemical treatment of the existing landfill leachate is removed, the process flow is greatly shortened, and the investment is also reduced to a certain extent.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic connection diagram of the mobile integrated landfill leachate treatment system of the present invention.
Fig. 2 is a schematic structural diagram of the mobile integrated landfill leachate treatment system of the present invention.
Fig. 3 is a schematic structural diagram of the lime coagulating sedimentation device of the utility model.
Fig. 4 is a schematic structural diagram of a struvite precipitation deamination nitrogen device of the utility model.
FIG. 5 is a schematic view showing the structure of the electrolytic cleaning device of the present invention.
FIG. 6 is a schematic view showing the structure of a sludge treatment apparatus according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Referring to fig. 1 and 2, a mobile integrated landfill leachate treatment system is composed of a container 1 and a landfill leachate treatment system 2 integrated in the container 1, wherein the landfill leachate treatment system 2 comprises a lime coagulating sedimentation device 100, a struvite precipitation deamination and denitrification device 200, an electrolysis purification device 300 and a sludge treatment device 400, and wherein:
lime coagulating sedimentation device 100
The lime coagulating sedimentation device 100 is composed of a landfill leachate collecting and adjusting tank 111, a chemical adding tank 112, a reaction tank 110, a sedimentation tank 120 and a supernatant storage tank 130, wherein a water inlet of the reaction tank 110 is connected with a water outlet of the landfill leachate collecting and adjusting tank 111, a water outlet of the reaction tank 110 is connected with a water inlet 121 of the sedimentation tank through a valve 115 and a mud pump 116, a supernatant water outlet 122 of the sedimentation tank is connected with a water inlet of the supernatant storage tank 130 through a valve 123, a sludge outlet of the sedimentation tank 120 is connected with an inlet of a sludge concentration tank through a valve 124 and a sludge pump 125, and a water outlet of the supernatant storage tank is connected with a struvite precipitation deamination nitrogen device 200;
struvite precipitation deamination nitrogen device 200
The struvite precipitation deamination and denitrification device 200 consists of a struvite precipitation reaction kettle 210, a magnesium salt solution storage tank 213, a phosphate solution storage tank 217, a precipitation separation tank 220, an intermediate water tank 230 and a struvite precipitation concentration tank 240; the magnesium salt solution storage tank 213 and the phosphate solution storage tank 217 are respectively connected with the struvite precipitation reaction kettle 210 through valves 214 and 218 and flow meters 215 and 219; the struvite precipitation reaction kettle 210 is also provided with a stirrer 216; the water inlet of the struvite precipitation reaction kettle 210 is connected with the water outlet of the supernatant storage tank 130 of the lime coagulating sedimentation device 100, the water outlet of the struvite precipitation reaction kettle 210 is connected with the water inlet 222 of the precipitation separation tank through a valve 212 and a lift pump 221, the water outlet of the precipitation separation tank 220 is connected with the water inlet of the intermediate water tank 230 through a valve 226 and a water pump 227, and the precipitation outlet of the precipitation separation tank 220 is connected with the struvite precipitation concentration tank 240 through a valve 224;
electrolytic purification device 300
The electrolytic purification device comprises an electrolytic machine 310, a direct current power supply 320, a degassing tank 330 and an electrode cleaning device 340, wherein a water inlet of the electrolytic machine 310 is connected with a water outlet of a middle water pool 230 of the struvite precipitation ammonia nitrogen removal device 200, a water outlet of the electrolytic machine 310 is connected with a water inlet 331 of the degassing tank 330, a water outlet of the degassing tank is connected with a municipal sewage pipe network, a water outlet pipe of the degassing tank 330 is further provided with a circulating water pump 335 to be connected with a water inlet pipe of the electrolytic machine 310, the electrode cleaning device 340 is composed of a pickling solution storage tank 341 and a pickling solution delivery pump 342, and the pickling solution adopts 2% -3% hydrochloric acid solution or 4% -5% citric acid solution;
sludge treatment apparatus 400
The sludge treatment device comprises a sludge pump 125, a sludge concentration tank 410, a physicochemical conditioning tank 420 and a dehydrator 430, wherein the inlet of the sludge pump 125 is respectively communicated with the sludge outlets of the lime coagulating sedimentation device and the electrolytic purification device, the outlet of the sludge pump 125 is communicated with the inlet of the sludge concentration tank 410, the sludge concentration tank is a gravity concentration tank, the sludge outlet 412 of the gravity concentration tank 410 is communicated with the inlet of the physicochemical conditioning tank 420, and the sewage outlet of the gravity concentration tank is communicated with the water inlet of the lime coagulating sedimentation device 100; the outlet of the physicochemical conditioning pool 420 is communicated with the sludge inlet of the dehydrator 430, the sludge blocks produced by the dehydrator 430 are collected in the sludge collection terrace, and the sewage of the dehydrator 430 is communicated with the water inlet of the lime coagulating sedimentation device 100.
The water inlet of a degassing tank 330 of the electrolytic purification device is connected with a water distributor 332 positioned at the bottom of the degassing tank, the water outlet at the upper part of the degassing tank 330 is connected with a municipal sewage pipe network, and the top of the degassing tank 330 is also provided with a slag scraper and a bubble collecting tank.
Sludge treatment equipment respectively with lime coagulating sedimentation device 100 and electrolytic purification device 300's sludge outlet, the export of sludge pump 125 with the import intercommunication of gravity thickening pond, the top delivery port of gravity thickening pond is used for communicateing lime coagulating sedimentation device's water inlet, the mud outlet of the bottom of gravity thickening pond with the import intercommunication of hydroextractor, still be provided with the agitator in the gravity thickening pond.
A purification method of mobile integrated landfill leachate, which adopts the mobile integrated landfill leachate treatment system to treat the landfill leachate, comprises the following steps:
(1) lime coagulating sedimentation:
the lime coagulating sedimentation is to quantitatively pump the landfill leachate from a landfill leachate collection and regulation pool 111 to a reaction tank 110, start a stirrer and regulate the volume of 5-10 Kg/m3Adding lime powder, stirring and reacting for 15-20 minutes, stopping stirring after the reaction is finished, pumping the garbage percolate after the reaction into a settling tank 120 for precipitating for 30-60 minutes, pumping the supernatant of the settling tank 120 into a supernatant storage tank 130, pumping the sludge at the bottom of the settling tank 120 into a sludge concentration tank, pumping the sludge in the sludge concentration tank into a dehydrator for dehydration, wherein the sludge block generated by dehydration of the dehydrator is sludge, and the sewage generated by dehydration of the dehydrator is pumped into a mixerSaving in a pool; the lime precipitation is mainly used for removing a large amount of SS, COD and BOD in the landfill leachate5Total phosphorus and various heavy metal ions are removed by more than 95 percent of SS, COD and BOD after lime precipitation treatment5More than 40% of the total phosphorus is removed, more than 80% of the total phosphorus is removed, and more than 90% of various heavy metal ions are removed;
(2) removing ammonia nitrogen by struvite precipitation:
the ammonia nitrogen removal of the struvite sediment is implemented by pumping the garbage leachate containing ammonia nitrogen after the lime coagulation sedimentation treatment in the step (1) into a struvite sediment reaction kettle 210 from a supernatant storage tank 130 in the step (1), adding a magnesium salt solution with a theoretical calculation amount of 1.1 times under the condition of continuous stirring, then adding a phosphate solution with a calculation amount of 1.1 times, reacting at room temperature for 15-30 minutes under continuous stirring, fully reacting ammonia ions, magnesium ions and phosphate ions in the effluent of the garbage leachate after the coagulation sedimentation to generate magnesium ammonium phosphate sediment, pumping the mixture into a sedimentation separation tank 220 after the reaction is completed, standing, performing solid-liquid separation, pumping clear liquor on the upper part of the sedimentation separation tank 220 into a middle water tank 230 for storage, and pumping the magnesium ammonium phosphate sediment on the lower part of the sedimentation separation tank 220 into a struvite sedimentation concentration tank 240; the molar ratio of reactants for removing ammonia nitrogen in the struvite precipitation reaction is as follows: NH (NH)4 +:Mg2+:PO4 3-1: 1.1: 1.1, removing ammonia nitrogen by the struvite sediment, wherein the ammonia nitrogen in the landfill leachate is mainly removed, and the ammonia nitrogen in the effluent of the landfill leachate after removing the ammonia nitrogen by the struvite sediment is less than 120 mg/L;
(3) electrolytic purification:
pumping the coagulated effluent water which is precipitated by the struvite and is used for removing ammonia nitrogen and stored in the intermediate water tank 230 in the step (2) into an electrolysis machine 310 for electrolysis and purification, wherein the working voltage of the electrolysis machine is 5-150V, the current is 10-4000A, the electrolyzed supernatant fluid enters a degassing tank 330 for gas-liquid separation, bubbles at the upper part are scraped into a bubble collecting tank through a residue scraping machine, and the lower part clear fluid is pumped into the electrolysis machine 310 again through a circulating water pump 335 for further electrolysis and purification until ammonia nitrogen, total nitrogen, COD and BOD are obtained5Discharging the qualified waste water into a municipal sewage pipe network, wherein the electrolysis is mainly used for removing the garbage percolate treated at the front sectionResidual COD and BOD5Main pollutants such as total phosphorus, SS, ammonia nitrogen and total nitrogen, and the waste effluent after electrolytic purification meets the following indexes: color number less than 5, COD less than 400mg/L, BOD5Less than 200mg/L, SS and less than 10mg/L, total nitrogen and ammonia nitrogen are less than 50mg/L, total phosphorus and fecal coliform bacteria number are less than 0.3mg/L and less than 3/L, so that the sewage nano-tube requirement is met;
(4) sludge treatment:
respectively conveying the scum obtained by lime coagulation sedimentation and electrolytic purification to a sludge concentration tank 410 for gravity concentration to form supernatant on the upper part and sludge on the bottom part; conveying the supernatant liquid to a water inlet pipe of a lime coagulating sedimentation device, and conveying bottom sludge to a conditioning tank 420; adding a physical and chemical conditioner into the physical and chemical conditioning tank 420, conveying the physical and chemical conditioner into the dehydrator 430, processing the physical and chemical conditioner into organic mud blocks, collecting the organic mud blocks, and burning the mud blocks, wherein the physical and chemical conditioner comprises lime, ferric trichloride and polyaluminium chloride.
The magnesium salt is one of magnesium sulfate heptahydrate, magnesium chloride or magnesium chloride hexahydrate, when in use, the magnesium salt is prepared into a 20-50% solution and stored in a magnesium salt storage tank for later use, and the addition amount is as follows: (the molecular weight of the magnesium salt is multiplied by the ammonia nitrogen concentration of the effluent of the landfill leachate) is multiplied by 1.1/18, the phosphate is one of sodium phosphate dodecahydrate, sodium hydrogen phosphate, sodium dihydrogen phosphate or anhydrous sodium phosphate, when in use, the phosphate is prepared into a 15-25% solution and stored in a phosphate storage tank for later use, and the addition amount is as follows: (the molecular weight of the phosphate is multiplied by the ammonia nitrogen concentration of the effluent of the landfill leachate) is multiplied by 1.1/18.
The effluent indexes of the garbage leachate treated by the movable integrated garbage leachate treatment system and the treatment method thereof are as follows: color number less than 5, COD less than 400mg/L, BOD5Less than 200mg/L, SS and less than 10mg/L, total nitrogen and ammonia nitrogen are less than 50mg/L, total phosphorus and fecal coliform number are less than 0.3mg/L and less than 3/L.
Example 1
And (3) treating leachate of a certain refuse transfer station by 20 tons per day.
The measured water quality of the raw landfill leachate is shown in table 2.
Table 2 water quality of landfill leachate raw water.
Serial number Item Unit of Measured value Serial number Item Unit of Measured value
1 CODCr mg/L 11000 5 Ammonia nitrogen mg/L 2050
2 SS mg/L 570 6 Total nitrogen mg/L 2570
3 Total phosphorus mg/L 50 7 pH value - 8.8
4 BOD5 mg/L 2850 8 Color intensity Multiple times 900
Step one, lime coagulating sedimentation
The lime coagulating sedimentation is that the landfill leachate is quantitatively pumped into the reaction tank 110 from the landfill leachate collecting and adjusting tank 111, and the stirrer is started to be 5Kg/m3Adding lime powder, stirring and reacting for 15-20 minutes, stopping stirring after the reaction is finished, pumping the garbage percolate after the reaction into a settling tank 110 for settling for 30-60 minutes, pumping the supernatant of the settling tank 110 into a supernatant storage tank 130, pumping the sludge at the bottom of the settling tank 110 into a sludge concentration tank, pumping the sludge in the sludge concentration tank into a dehydrator for dehydration, wherein sludge blocks generated by dehydration of the dehydrator are sludge, and the sewage generated by dehydration of the dehydrator is pumped into a regulating reservoir; the lime coagulating sedimentation is mainly used for removing a large amount of SS, COD and BOD in the landfill leachate5Total phosphorus and various heavy metal ions are precipitated by limeOver 95% of SS is removed, COD and BOD5More than 40% of the total phosphorus is removed, more than 80% of the total phosphorus is removed, and more than 90% of various heavy metal ions are removed;
step two, ammonia nitrogen removal by struvite precipitation:
the ammonia nitrogen removal of the struvite sediment is implemented by pumping the garbage percolate containing ammonia nitrogen after the lime coagulation sedimentation treatment in the step (1) into a struvite sediment reaction kettle 210 from a supernatant storage tank 130 in the step (1), adding a magnesium salt solution with a theoretical calculation amount of 1.1 times under the condition of continuous stirring, then adding a phosphate solution with a calculation amount of 1.1 times, reacting at room temperature for 15-30 minutes under continuous stirring, so that ammonia ions in the percolate fully react with magnesium ions and phosphate ions to generate magnesium ammonium phosphate sediment, pumping the ammonium magnesium phosphate sediment into a sediment separation tank 220 after the reaction is finished, standing, performing solid-liquid separation, pumping clear liquid on the upper part of the sediment separation tank 220 into an intermediate water tank 230 for storage, pumping the magnesium ammonium phosphate sediment on the lower part of the sediment separation tank 220 into a struvite sediment concentration tank 240, pumping into a dehydrator for dehydration to obtain solid struvite sediment and filtrate, pumping the filtrate into the intermediate water tank (in, placing the solid struvite precipitate in a dryer for further drying, metering and packaging to obtain a struvite product; the molar ratio of reactants for removing ammonia nitrogen in the struvite precipitation reaction is as follows: NH (NH)4 +: Mg2+:PO4 3-1: 1.1: 1.1, removing ammonia nitrogen by the struvite sediment, wherein the ammonia nitrogen in the landfill leachate is mainly removed, and the ammonia nitrogen in the effluent of the landfill leachate after removing the ammonia nitrogen by the struvite sediment is less than 112 mg/L;
step three, electrolytic purification
Pumping the effluent water which is precipitated by the struvite and is used for removing ammonia nitrogen and is stored in the intermediate water tank 230 in the step (2) into an electrolysis machine 310 for electrolysis and purification, wherein the working voltage of the electrolysis machine is 5V, the current is 4000A, the electrolyzed supernatant liquid enters a degassing tank 330 for gas-liquid separation, bubbles at the upper part are scraped into a bubble collecting tank through a residue scraping machine, and the lower part clear liquid is pumped into the electrolysis machine 310 again through a circulating water pump 335 for further electrolysis and purification until ammonia nitrogen, total nitrogen, COD and BOD are obtained5Discharging the qualified waste water into a municipal sewage collecting pipe network, wherein the electrolysis is mainly used for removing the residual garbage percolate after the front-stage treatmentCOD、BOD5Main pollutants such as total phosphorus, SS, ammonia nitrogen and total nitrogen, and the waste effluent after electrolytic purification meets the following indexes: the chroma is 2, the COD is 390mg/L, BOD5185mg/L, SS is 8mg/L, total nitrogen is 47mg/L, ammonia nitrogen is 26mg/L, total phosphorus is 0.2mg/L, and fecal coliform bacteria number is 3/L.
TABLE 3 effluent quality of the treated landfill leachate
Serial number Item Unit of Measured value Serial number Item Unit of Measured value
1 CODCr mg/L 390 4 Total nitrogen mg/L 47
2 BOD5 mg/L 185 5 Total phosphorus mg/L 0.2
3 SS mg/L 8 6 Color intensity Multiple times 2
4 Ammonia nitrogen mg/L 26 7 pH value - 7.2
Example 2
And (3) treating 50 tons/day leachate of a certain refuse transfer station.
The raw water of landfill leachate has the measurement indexes shown in table 4.
Table 4 water quality of landfill leachate raw water.
Serial number Item Unit of Measured value Serial number Item Unit of Measured value
1 CODCr mg/L 17600 5 Ammonia nitrogen mg/L 2593
2 SS mg/L 802 6 Color intensity Multiple times 900
3 Total phosphorus NTU 30 7 pH value - 9.0
4 BOD5 mg/L 2700 8 Total nitrogen mg/L 2885
Step one, lime coagulating sedimentation
The lime coagulating sedimentation is that the landfill leachate is quantitatively pumped into the reaction tank 110 from the landfill leachate collecting and adjusting tank 111, and the stirrer is started to be at 10Kg/m3Adding lime powder, carrying out stirring reaction for 15-20 minutes, stopping stirring after the reaction is finished, pumping the garbage percolate after the reaction into a settling tank 110 for settling for 30-60 minutes, pumping the supernatant of the settling tank 110 into a supernatant storage tank 130, pumping the sludge at the bottom of the settling tank 110 into a sludge concentration tank, pumping the sludge in the sludge concentration tank into a dehydrator for dehydration, wherein the sludge block generated by dehydration of the dehydrator is sludge, and the sewage generated by dehydration of the dehydrator is pumped into an adjusting tank; the lime coagulating sedimentation is mainly used for removing a large amount of SS, COD and BOD in the landfill leachate5Total phosphorus and various heavy metal ions are removed by more than 95 percent of SS, COD and BOD after lime precipitation treatment5More than 40% of the total phosphorus is removed, more than 80% of the total phosphorus is removed, and more than 90% of various heavy metal ions are removed;
step two, ammonia nitrogen removal by struvite precipitation: the ammonia nitrogen removal by struvite precipitation is to treat the landfill leachate containing ammonia nitrogen after the lime coagulation precipitation treatment in the step (1) from the sewage treatment tankPumping the supernatant storage tank 130 in the step (1) into a struvite precipitation reaction kettle 210, adding a magnesium salt solution with a theoretical calculation amount of 1.1 times under the condition of continuous stirring, then adding a phosphate solution with a calculation amount of 1.1 times, reacting at room temperature for 15-30 minutes under continuous stirring, fully reacting ammonia ions in leachate with magnesium ions and phosphate ions to generate magnesium ammonium phosphate precipitates, pumping the magnesium ammonium phosphate precipitates into a precipitation separation tank 220 after the reaction is finished, standing, performing solid-liquid separation, pumping clear liquid on the upper part of the precipitation separation tank 220 into an intermediate water tank 230 for storage, pumping the magnesium ammonium phosphate precipitates on the lower part of the precipitation separation tank 220 into a struvite precipitation concentration tank 240, pumping into a dehydrator for dehydration to obtain solid struvite precipitates and filtrate, pumping the filtrate into the intermediate water tank, placing the solid struvite precipitates into a dryer for further drying, metering and packaging to obtain struvite products; the molar ratio of reactants for removing ammonia nitrogen in the struvite precipitation reaction is as follows: NH (NH)4 +:Mg2+:PO4 3-1: 1.1: 1.1, removing ammonia nitrogen by the struvite sediment, wherein the ammonia nitrogen in the landfill leachate is mainly removed, and the ammonia nitrogen in the effluent of the landfill leachate after removing the ammonia nitrogen by the struvite sediment is less than 112 mg/L;
step three, electrolytic purification
Pumping the effluent water which is precipitated by the struvite and is used for removing ammonia nitrogen and is stored in the intermediate water tank 230 in the step (2) into an electrolysis machine 310 for electrolysis and purification, wherein the working voltage of the electrolysis machine 310 is 45V, the current is 3000A, the electrolyzed supernatant liquid enters a degassing tank 330 for gas-liquid separation, bubbles at the upper part are scraped into a bubble collecting tank through a residue scraping machine, and the lower part clear liquid is pumped into the electrolysis machine 310 again through a circulating water pump 335 for further electrolysis and purification until ammonia nitrogen, total nitrogen, COD, BOD and total nitrogen5Discharging the qualified waste water into a municipal sewage collecting pipe network, wherein the electrolytic purification is mainly used for removing residual COD and BOD in the garbage percolate after the front-stage treatment5Main pollutants such as total phosphorus, SS, ammonia nitrogen and total nitrogen, and the waste effluent after electrolytic purification meets the following indexes: the chroma is 2, the COD is 385mg/L, BOD5179mg/L, SS is 8mg/L, total nitrogen is 45mg/L, ammonia nitrogen is 25mg/L, total phosphorus is 0.25mg/L, and fecal coliform bacteria number is 3/L.
TABLE 5 effluent quality of landfill leachate after treatment
Serial number Item Unit of Measured value Serial number Item Unit of Measured value
1 CODCr mg/L 385 5 Ammonia nitrogen mg/L ≤25
2 SS mg/L 8 6 Total nitrogen mg/L ≤45
3 Total phosphorus mg/L 0.25 7 Color intensity 2
4 BOD5 mg/L 179 8 pH value - 7.2
Example 3
A 50 ton/day leachate treatment device of a certain refuse landfill transfer station.
The raw water of landfill leachate has the measurement indexes shown in table 6.
Table 6 quality of raw landfill leachate.
Serial number Item Unit of Measured value Serial number Item Unit of Measured value
1 CODCr mg/L 6490 5 Ammonia nitrogen mg/L 951
2 BOD5 mg/L 1381 6 Total nitrogen mg/L 1210
3 Total phosphorus mg/L 12 7 Color intensity Multiple times 500
4 SS mg/L 800 8 pH value - 8.5
Step one, lime coagulating sedimentation
The lime coagulating sedimentation is that the landfill leachate is quantitatively pumped into the reaction tank 110 from the landfill leachate collecting and adjusting tank 111, and the stirrer is started to be 7Kg/m3Adding lime powder, stirring and reacting for 15-20 minutes, stopping stirring after the reaction is finished, pumping the garbage percolate after the reaction into a settling tank 110 for precipitating for 30-60 minutes, pumping the supernatant of the settling tank 110 into a supernatant storage tank 130, pumping the sludge at the bottom of the settling tank 110 into a sludge concentration tank, pumping the sludge in the sludge concentration tank into a dehydrator for dehydration, wherein sludge blocks generated by dehydration of the dehydrator are sludge, and the sewage generated by dehydration of the dehydrator is pumped into a regulating reservoir; the lime coagulating sedimentation is mainly used for removing a large amount of SS, COD and BOD in the landfill leachate5Total phosphorus and various heavy metal ions are removed by more than 95 percent of SS, COD and BOD after lime precipitation treatment5More than 40% of the total phosphorus is removed, more than 80% of the total phosphorus is removed, and more than 90% of various heavy metal ions are removed;
step two, ammonia nitrogen removal by struvite precipitation: the ammonia nitrogen removal of the struvite sediment is implemented by pumping the garbage leachate containing ammonia nitrogen after the lime coagulation and precipitation treatment in the step (1) into a struvite sediment reaction kettle 210 from a supernatant storage tank 130 in the step (1), adding a magnesium salt solution with a theoretical calculation amount of 1.1 times under the condition of continuous stirring, then adding a sodium phosphate solution with a calculation amount of 1.1 times, and reacting at room temperature for 15-30 minutes under the condition of continuous stirring to ensure that ammonia ions, magnesium ions and phosphate ions in the leachate are fully reacted for 15-30 minutesReacting to generate magnesium ammonium phosphate precipitate, pumping into a precipitation separation tank 220 after the reaction is finished, standing, performing solid-liquid separation, pumping clear liquor at the upper part of the precipitation separation tank 220 into an intermediate water tank 230 for storage, pumping the magnesium ammonium phosphate precipitate at the lower part of the precipitation separation tank 220 into a struvite precipitation concentration tank 240, pumping into a dehydrator for dehydration to obtain solid struvite precipitate and filtrate, pumping the filtrate into the intermediate water tank, placing the solid struvite precipitate into a drier for further drying, metering and packaging to obtain a struvite product; the molar ratio of reactants for removing ammonia nitrogen in the struvite precipitation reaction is as follows: NH (NH)4 +:Mg2+:PO4 3-1: 1.1: 1.1, removing ammonia nitrogen by the struvite sediment, wherein the ammonia nitrogen in the landfill leachate is mainly removed, and the ammonia nitrogen in the effluent of the landfill leachate after removing the ammonia nitrogen by the struvite sediment is less than 96 mg/L;
step three, electrolytic purification
Pumping effluent water which is precipitated by struvite and is used for removing ammonia nitrogen and is stored in the intermediate water tank 230 in the step (2) into an electrolysis machine 310 for electrolysis and purification, wherein the working voltage of the electrolysis machine 310 is 150V, the current is 800A, the electrolyzed supernatant liquid enters a degassing tank 330 for gas-liquid separation, bubbles at the upper part are scraped into a bubble collecting tank through a residue scraping machine, and the lower part clear liquid is pumped into the electrolysis machine 310 again through a circulating water pump 335 for further electrolysis and purification until ammonia nitrogen, total nitrogen, COD and BOD are obtained5Discharging the qualified waste water into a municipal sewage collecting pipe network, wherein the electrolytic purification is mainly used for removing residual COD and BOD in the garbage percolate after the front-stage treatment5Main pollutants such as total phosphorus, SS, ammonia nitrogen and total nitrogen, and the waste effluent after electrolytic purification meets the following indexes: the chroma is 3, the COD is 387mg/L, BOD5153mg/L, SS is 9mg/L, total nitrogen is 39mg/L, ammonia nitrogen is 16.5mg/L, total phosphorus is 0.12mg/L, and fecal coliform number is 3/L.
TABLE 7 effluent quality of landfill leachate after treatment
Serial number Item Unit of Measured value Serial number Item Unit of Measured value
1 CODCr mg/L 387 5 Ammonia nitrogen mg/L 16.5
2 BOD5 mg/L 153 6 Total nitrogen mg/L 39
3 Total phosphorus mg/L 0.12 7 Color intensity Multiple times 3
4 SS mg/L 9 8 pH value - 7.5
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the utility model is not limited to the forms disclosed herein, but is not intended to be exhaustive or to exclude other embodiments and may be used in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the utility model as defined by the appended claims.

Claims (4)

1. A movable integrated landfill leachate treatment system is characterized by comprising a container and a landfill leachate treatment system integrated in the container, wherein the landfill leachate treatment system comprises a lime coagulating sedimentation device, a struvite precipitation deamination and denitrification device, an electrolysis purification device and a sludge treatment device, the sludge treatment device is respectively connected with the lime coagulating sedimentation device and the electrolysis purification device,
the lime coagulating sedimentation device consists of a garbage leachate collecting and adjusting tank, a chemical feeding tank, a reaction tank, a sedimentation tank and a supernatant storage tank, wherein a water inlet of the reaction tank is connected with a water outlet of the garbage leachate collecting and adjusting tank, a water outlet of the reaction tank is connected with a water inlet of the sedimentation tank, a supernatant water outlet of the sedimentation tank is connected with a water inlet of the supernatant storage tank, a sludge outlet of the sedimentation tank is connected with a sludge concentration tank, and a water outlet of the supernatant storage tank is connected with the struvite precipitation deamination nitrogen removal device;
the struvite precipitation deamination and denitrification device consists of a struvite precipitation reaction kettle, a magnesium salt solution storage tank, a phosphate solution storage tank, a precipitation separation tank, an intermediate water tank and a struvite precipitation concentration tank; the magnesium salt solution storage tank and the phosphate solution storage tank are respectively connected with the struvite precipitation reaction kettle; the water inlet of the struvite precipitation reaction kettle is connected with the water outlet of the supernatant storage tank, the water outlet of the struvite precipitation reaction kettle is connected with the water inlet of the precipitation separation tank, the water outlet of the precipitation separation tank is connected with the water inlet of the intermediate water tank, and the precipitation outlet of the precipitation separation tank is connected with the struvite precipitation concentration tank through a valve;
the electrolytic purification device comprises an electrolytic machine, a direct current power supply and a degassing tank, wherein a water inlet of the electrolytic machine is connected with a water outlet of the intermediate water tank, a water outlet of the electrolytic machine is connected with a water inlet of the degassing tank, a water outlet of the degassing tank is connected with a municipal sewage pipe network, and a water outlet pipe of the degassing tank is also provided with a circulating water pump which is connected with a water inlet pipe of the electrolytic machine;
the sludge treatment device comprises a sludge pump, a sludge concentration tank, a physicochemical conditioning tank and a dehydrator, wherein the inlet of the sludge pump is respectively communicated with the sludge outlets of the lime coagulation sedimentation device and the electrolytic purification device, the outlet of the sludge pump is communicated with the inlet of the sludge concentration tank, the sludge outlet of the sludge concentration tank is communicated with the inlet of the physicochemical conditioning tank, and the sewage outlet of the sludge concentration tank is communicated with the water inlet of the lime coagulation sedimentation device; the outlet of the physicochemical conditioning pool is communicated with the sludge inlet of the dehydrator, and the sewage of the dehydrator is communicated with the water inlet of the lime coagulating sedimentation device.
2. The mobile integrated landfill leachate treatment system of claim 1, wherein the electrolytic purification device further comprises an electrode cleaning device, wherein the electrode cleaning device is composed of a pickling solution storage tank and a pickling solution delivery pump.
3. The mobile integrated landfill leachate treatment system of claim 1, wherein the water inlet of the degassing tank is connected to a water distributor located at the bottom of the degassing tank, the water outlet of the upper part of the degassing tank is connected to a municipal sewage pipe network, and the top of the degassing tank is further provided with a slag scraper and a bubble collecting tank.
4. The mobile integrated landfill leachate treatment system of claim 1, wherein the sludge concentration tank is a gravity concentration tank, the sludge outlet of the lower zone in the gravity concentration tank is communicated with the inlet of the dewatering machine, and a stirrer is further arranged in the gravity concentration tank.
CN202120080272.2U 2021-01-12 2021-01-12 Movable integrated landfill leachate treatment system Active CN215559586U (en)

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