CN111675433A - Ecological strengthening treatment method for landfill leachate in northwest loess area - Google Patents
Ecological strengthening treatment method for landfill leachate in northwest loess area Download PDFInfo
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- CN111675433A CN111675433A CN202010548677.4A CN202010548677A CN111675433A CN 111675433 A CN111675433 A CN 111675433A CN 202010548677 A CN202010548677 A CN 202010548677A CN 111675433 A CN111675433 A CN 111675433A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G22/00—Cultivation of specific crops or plants not otherwise provided for
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G25/00—Watering gardens, fields, sports grounds or the like
- A01G25/02—Watering arrangements located above the soil which make use of perforated pipe-lines or pipe-lines with dispensing fittings, e.g. for drip irrigation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
Abstract
The invention relates to an ecological strengthening treatment method for landfill leachate in northwest loess areas, and belongs to the technical field of solid waste treatment in environmental engineering. The method comprises the following steps: leachate generated by a refuse landfill in the loess area is stored in the regulating tank I in winter and begins to be treated in the next spring; the surface recharging process is adopted for treatment in spring, summer and autumn, and the process units comprise: an aeration stripping tank, a regulating tank I, an up-flow anaerobic sludge bed, a filtering room, a regulating tank II and a recharging system. The landfill leachate after biological treatment is recharged to the loess covering layer and is effectively controlled under the action of atmospheric evaporation and the growth and absorption of ecological grids built on the surface layer. The method has the advantages of simple process, good treatment effect and low treatment cost, and can be better matched with the economic development level and the natural geographic characteristics of the northwest loess area in China.
Description
Technical Field
The invention belongs to the technical field of solid waste treatment in environmental engineering, and relates to a method for ecologically strengthening treatment of landfill leachate in a refuse landfill in the northwest loess area.
Background
In China, the main domestic garbage treatment methods are sanitary landfill, garbage incineration and composting. Among them, the sanitary landfill process is simple, the treatment capacity is large, the management is convenient, and the application is the most extensive. Leachate generated by sanitary landfill of garbage contains a large amount of pollutants with complex components, and the water quality and the water quantity change greatly and the treatment is difficult. At present, the landfill leachate treatment technology in China mainly combines certain advanced treatment technologies such as nanofiltration, reverse osmosis, adsorption filtration, advanced chemical oxidation and the like for biochemical treatment, is matched with a membrane treatment technology of a pretreatment technology and a mechanical vapor compression evaporation process of a corresponding auxiliary flow, and the investment and the operating cost of the three main treatment processes are high. The northwest loess area of China is deep in the inland, belongs to temperate continental climate, has large evaporation capacity and less rainfall all the year round. Influenced by geographical and climatic conditions, the water content of the domestic garbage components in the region is relatively low, the total quantity of generated garbage percolate is less, the garbage percolate is mostly concentrated in summer, and the seasonality is obvious. The load operation amount of the landfill leachate treatment facility in spring, summer and autumn is only about 30%, the landfill leachate treatment facility is almost not operated in winter, equipment cannot be effectively utilized, and great waste of engineering construction input cost is caused.
Therefore, the development of a new technology for treating the landfill leachate, which is matched with the climatic characteristics, the economic development level, the natural geographic characteristics and the leachate generation characteristics of the loess area in northwest, is urgently needed.
Disclosure of Invention
Aiming at the condition that the existing landfill leachate treatment process in the northwest loess area is not suitable for the economic development level, the invention provides the landfill leachate treatment method which has the advantages of simple process, good treatment effect and low cost and is suitable for the northwest loess area.
Landfill leachate of the refuse landfill in the northwest loess area is mostly generated in summer, a large amount of leachate is reduced in spring and autumn, and the production amount in winter is very small. Accordingly, the method for treating the landfill leachate provided by the invention comprises the following steps: the landfill leachate is stored in the regulating tank I in winter and begins to be treated in the next spring; the surface recharging process is adopted for treatment in spring, summer and autumn, and the process units comprise: the aeration stripping tank, the adjusting tank I, the upflow anaerobic sludge blanket, the filtering room, the adjusting tank II and the recharge system. The landfill leachate is subjected to biochemical treatment and then is re-filled to a loess covering layer, and zero discharge can be realized under the action of atmospheric evaporation and growth and absorption of ecological grids built and planted on the surface layer.
1. Biochemical treatment of garbage percolate
The aeration stripping tank and the top support of the tank body of the adjusting tank adopt transparent sun-proof hood caps, so that rainwater can be prevented from falling, and meanwhile, the amount of percolate can be reduced through natural evaporation. Preferably, the transparent hood is constructed by glass fiber reinforced plastic materials. And (3) aerating and oxygenating by adopting a jet aeration method, controlling the hydraulic retention time of the landfill leachate to be 6h, and controlling the dissolved oxygen content of the effluent to be 5-7 mg/L. The jet aeration removes ammonia by blowing off, reduces the biological inhibition of the landfill leachate, greatly enhances the biodegradability of the landfill leachate, and finally leads to CODCrIs effectively removed. During the process that the landfill leachate is discharged into the regulating tank I from the aeration stripping tank, the solubility of dissolved oxygen is gradually reduced, and microorganisms further degrade nitrogenous organic pollutants through nitrification and denitrification in the aerobic-anaerobic process.
The anaerobic fermentation temperature of the upflow anaerobic sludge blanket is 30-35 ℃, and the COD of the influent garbage percolate is determinedCrValue control of organic load (COD)Cr) And hydraulic retention time, so that the effluent COD of the landfill leachateCrThe content is less than 1000 mg/L. Specific operating parameters are shown in table 1.
TABLE 1 upflow anaerobic sludge blanket operating parameters
| CODCr(mg/L) | Organic load (kg/(m)3·d)) | Hydraulic retention time (h) |
| ＜10000 | 7-12 | 19-27 |
| ＞10000 | 12-15 | 27-40 |
And a secondary filtering device is arranged in the filtering room. Preferably, the primary filter system is a 60-mesh filter screen, the secondary filter system is a 120-mesh laminated filter, and solid particles in the landfill leachate can be effectively removed by secondary filtration, so that the spray irrigation system is prevented from being blocked.
2. Landfill leachate recharge
a. And (3) arranging a recharge system: leveling loess coverage layers of the refuse landfill, as shown in figure 2, constructing 2m × 2m ecological grids, taking 11 × 11 grids as a unit, installing a sprinkling irrigation spray head in a central grid, wherein the spray head can automatically rotate for 360 degrees, the radius of the range is 11-16m, and all grids in the unit can be covered. And a recharge pipeline is arranged in the direction of the warp or the weft.
b. Ecological square planting: the depth of the longitude and latitude grid shallow trench is 5cm, the width is 20cm, northwest resistant grass seeds are sown in the shallow trench, and dune reeds are planted between the two sides of the shallow trench. The preferred grass species is one or more of tall fescue, ryegrass, Shadawang, brome without awn, alfalfa.
c, recharging: and (4) performing recharging according to the climate characteristics, the natural geographic characteristics and the seasonal distribution rule of the landfill leachate generation amount in the northwest loess area by referring to the table 2.
TABLE 2 landfill leachate seasonal recharge operating parameters
The invention has the beneficial effects that:
1. according to the climate characteristics, the natural geographical characteristics, the current situation of loess coverage of the refuse landfill and the production characteristics of refuse leachate in the northwest loess area of China, the leachate produced by the refuse landfill is stored in the regulating tank I in winter and is temporarily not treated, and the leachate is treated by adopting a surface recharging process in spring, summer and autumn. The landfill leachate is subjected to biological treatment and then is re-filled into a loess covering layer, and the in-field treatment of the landfill leachate can be realized under the combined action of atmospheric evaporation and growth and absorption of ecological grids built on the surface layer. The method has simple process, greatly reduces the treatment cost of unit landfill leachate, and is matched with the economic development level of northwest regions.
2. The invention provides a method for carrying out reduction control on landfill leachate by combining loess covering layer-atmospheric evaporation with strong transpiration of ecological square vegetation. The grass seeds can grow on the surface layer of the covering layer of the refuse landfill to form a grass blanket, dune reeds are plants with strong transpiration, underground rhizomes are developed and distributed in a network shape, and a large amount of water can be absorbed and stored. The ecological grids are built on the landfill cover layer by taking northwest tolerant grass seeds and dune reeds as pioneer plants, so that the soil loss of the loess cover layer can be resisted, rainwater seepage and dropping can be effectively controlled, the evaporation and biological absorption treatment of the landfill leachate can be enhanced, and meanwhile, the unorganized emission of landfill gas caused by the cracking of the loess cover layer can be prevented.
3. The dune reed constructed and selected by the ecological square grid has strong tolerance and purification capacity to pollutants such as heavy metals, ammonia nitrogen and the like. Pollutants in the landfill leachate can be converted into usable biomass after anaerobic fermentation treatment, and the biomass can be easily decomposed and utilized by dune reeds and soil layer microorganisms, so that the fertility of the loess covering layer is further improved.
4. The invention adopts a daily (except rainy days) sprinkling irrigation water outlet mode to carry out the recharging of the landfill leachate, can increase the contact area of the landfill leachate and the atmosphere, further strengthen the evaporation, simultaneously reduce the labor intensity of workers and avoid the cutoff caused by uneven ground.
Drawings
Fig. 1 is a process flow diagram of landfill leachate treatment.
FIG. 2 is a schematic diagram of ecological grid planting.
Detailed Description
The following describes an embodiment of the present invention in detail with reference to fig. 1 and fig. 2, the embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and an operation process are given, but the scope of the present invention is not limited to the following embodiments.
The implementation place of the embodiment is a certain domestic garbage landfill site in Lanzhou city, and the total floor area is about 41hm2Total reservoir capacity 390 × 104m3The average daily treatment of the domestic garbage is 520t, and the daily average production of the garbage percolate is 100m3And d, the construction scale of the refuse landfill is II. The annual precipitation amount of the site is 200-1600 mm, the precipitation is mostly concentrated in three months of 7, 8 and 9, the precipitation amount accounts for more than 80 percent of the annual precipitation amount, the annual evaporation amount is 1100-1600mm, the annual sunshine is 2500-2900h, the maximum wind speed is 17.0m/s, the main wind direction is northeast, and the secondary wind direction is southwest. COD of garbage leachate in spring, summer and autumnCrThe value is 500-4000 mg/L; ammonia nitrogen value of 300-700mg/L, COD in winterCrThe value is 2500-4000 mg/L; the ammonia nitrogen value is 1000-1500 mg/L.
1. Biochemical treatment of garbage percolate
Collecting and discharging the landfill leachate into an aeration stripping tank, installing a jet aerator in the tank, controlling the hydraulic retention time of the landfill leachate to be 6 hours, and controlling the content of dissolved oxygen in the effluent to be 5-7 mg/L. The effluent landfill leachate is conveyed to an adjusting tank I, the volume of the adjusting tank I is the treatment capacity of the landfill leachate in summer, in the tank, microorganisms degrade pollutants through respiration, the landfill leachate is conveyed to an upflow anaerobic sludge bed after being changed from an aerobic state to an anaerobic state, the hydraulic retention time is 20 hours, and the organic load is 7kg/(m & lt/(m & gt)3D) anaerobic fermentation treatment at 30 ℃. And the garbage leachate after anaerobic fermentation is filtered by a 60-mesh filter screen and a 120-mesh laminated filter in sequence and is drained to a regulating reservoir II as a recharging stock solution.
2. Landfill leachate recharge
a. And (3) arranging a recharge system: will be 4hm2Leveling loess coverage layer of refuse landfill to construct 2m × 2m ecological grids, taking 11 × 11 grids as shown in figure 2 as a unit, installing a sprinkling irrigation spray head 3 in the central grid, and enabling the spray head 3 to be perpendicular to the groundThe straight distance was 1.5m, and the steel sleeve was used for fixation. The spray head can automatically rotate at 360 degrees, the radius of the spray range is 11-16m, and all the grids in the unit can be covered. And a polyvinyl chloride pipe with the pipe diameter of DN40 is paved in the direction of the warp or the weft as a landfill leachate recharging pipe.
b. Ecological square planting: before and after the solar term is clarified, tall fescue, ryegrass, sarwang, awnless brome and alfalfa seeds are sown in the ecological grid shallow trench with the depth of 5cm and the width of 20cm according to the proportion of 1:1:1:1: 1. Before and after the rain in the valley is in the solar term, dune reed seedlings 2 are planted on two sides of the grass furrow 1 in a left-right snake-shaped mode. The germchit of the dune reed 2 is trimmed according to the standard of 15-20cm above the ground and 20-25cm below the ground, and is planted by 3-5 tillers in each hole and 20cm of horizontal spacing in a staggered way.
c, recharging: the invention also discloses the method.
The landfill leachate is temporarily stored in the regulating tank I in winter, and the landfill leachate is treated in the spring of the next year.
Claims (6)
1. A method for ecologically strengthening treatment of landfill leachate in northwest loess areas is characterized by comprising the following steps: according to the natural resources, climate characteristics, economic development level of the northwest loess area of China, the current situation that loess is generally adopted as a covering material in a refuse landfill and the characteristics of refuse leachate generation, the leachate generated by the refuse landfill in the loess area is treated by adopting a surface recharging process in spring, summer and autumn, and the process units comprise: the aeration stripping tank, the adjusting tank I, the upflow anaerobic sludge blanket, the filtering room, the adjusting tank II and the recharge system; the treated water is stored in the adjusting tank I in winter and begins to be treated in the next spring.
2. An aeration stripping pool as claimed in claim 1, wherein a jet aeration mode is adopted, the hydraulic retention time of landfill leachate is controlled to be 6h, and the dissolved oxygen content of effluent is 5-7 mg/L.
3. The upflow anaerobic sludge blanket of claim 1 wherein the anaerobic fermentation temperature is 30-35 ℃ based on the landfill leachate CODCrValue control of organic load (COD)Cr) And hydraulic powerThe retention time is controlled to control the COD of the effluent of the landfill leachateCrThe content is less than 1000mg/L, and when the landfill leachate enters the water, the COD isCrWhen the content is less than 10000mg/L, the organic load is regulated to be 7-12 kg/(m)3D) the hydraulic retention time is 19 to 27 h; COD when landfill leachate is intakeCrWhen the content is more than 10000mg/L, the organic load is regulated to 12-15 kg/(m)3D) the hydraulic retention time is from 27 to 40 h.
4. The filtration room of claim 1, wherein a two-stage filtration mode is adopted, the first stage filtration system adopts a 60-mesh filter screen, and the second stage filtration system adopts a 120-mesh laminated filter.
5. The ecological square grid of claim 1, wherein the ecological square grid is formed by planting longitude and latitude ecological square grids on the surface of a covering layer of a refuse landfill, and the ecological square grid is formed by intercropping one or more of tall fescue, ryegrass, sargassum, awnless brome and alfalfa and dune reed, and the size of the square grid is 2m x 2 m.
6. The landfill leachate recirculation system of claim 1, wherein 11 × 11 ecological grids are used as a unit, a sprinkling nozzle is installed in the central grid, the nozzle can automatically rotate at 360 degrees, the radius of the spraying range is 11-16m, the nozzle can cover all the ecological grids in the unit, and the landfill leachate recirculation hydraulic load in spring and autumn (3-5 months and 9-10 months) is 25.0-35.0m3/(hm2D) summer (6-8 months) 35.0-45.0m3/(hm2D), the recharging time in spring and autumn is 10:00-14:00 every day, and the recharging time in summer is 9:00-15:00 in non-rainy days.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114394717A (en) * | 2022-01-05 | 2022-04-26 | 天津建昌环保股份有限公司 | In-situ pollution control method for household garbage landfill |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114394717A (en) * | 2022-01-05 | 2022-04-26 | 天津建昌环保股份有限公司 | In-situ pollution control method for household garbage landfill |
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