A vehicle-mounted mobile garbage leachate emergency treatment method and system

Abstract

The present invention discloses a vehicle-mounted mobile emergency treatment method for landfill leachate, comprising the following steps: setting a mobile vehicle-mounted emergency treatment system for landfill leachate, first subjecting the leachate to nanofiltration treatment; the nanofiltration effluent enters the nitrite-anaerobic ammonia oxidation treatment, and the nanofiltration concentrate is subjected to polyferric coagulation treatment, and the supernatant is mixed with the nitrite-anaerobic ammonia oxidation treatment effluent for subsequent deep treatment; after treatment in a denitrification aerated biological filter chamber, denitrification treatment is performed; entering an ozone aerated biological filter chamber, decomposing and destroying the refractory organic matter to carbonize, and then further removing the residual organic matter and ammonia nitrogen in the wastewater, and finally the effluent meets the standards for external discharge. The present invention also discloses a system for implementing the method, which is an integrated system in which all components are arranged in a container, which is convenient for vehicle-mounted movement and operation. The present invention has no concentrated liquid discharge, does not require an external carbon source, saves aeration volume, has low sludge production, and is suitable for emergency treatment.

Description

Technical Field

[0001] The present invention relates to the technical field of water pollution treatment for environmental protection, and in particular to a vehicle-mounted mobile garbage leachate emergency treatment method and system. Background Art

[0002] Landfill leachate is a typical high-concentration wastewater containing high ammonia nitrogen and difficult-to-biodegrade organic matter, which is extremely difficult to treat. The key to meeting the treatment standards lies in how to effectively remove ammonia nitrogen, total nitrogen and difficult-to-biodegrade organic matter. The "biochemical method + membrane method" process is generally used for the treatment of conventional landfill leachate in China. The biochemical method removes ammonia nitrogen and total nitrogen from the leachate by complete nitrification and denitrification, and the biochemical effluent is deeply treated by nanofiltration + reverse osmosis membrane process. The complete nitrification of high-concentration ammonia nitrogen requires a large amount of dissolved oxygen and high aeration energy consumption; when the carbon-nitrogen ratio is insufficient (less than 5), a large amount of carbon source needs to be added, which increases the operating cost. At present, the conventional emergency treatment device for landfill leachate adopts a multi-stage high-pressure reverse osmosis device, which requires the addition of a large amount of sulfuric acid to form ammonium sulfate and separate it by high-pressure reverse osmosis; and the evaporation emergency treatment device also requires a large amount of sulfuric acid to prevent ammonia from escaping.

[0003] The membrane process only concentrates and separates pollutants, and the high-salt concentrate discharged is recharged to the landfill. The evaporation process is the same as the membrane process. The concentrate also needs to be recharged. After long-term operation, the salinity of the leachate will increase, making the entire leachate treatment system unable to operate normally, and the leachate in the landfill will gradually accumulate. At present, the garbage emergency treatment engineering vehicles all use high-pressure reverse osmosis, but the continuous recharge of the concentrate water causes the salt concentration to continue to increase, resulting in almost no way to further treat the leachate.

[0004] When the separation of rainwater and sewage is incomplete, heavy rain will cause a sharp increase in leachate production. The existing treatment plant has limited processing capacity, and emergency treatment equipment is also needed to treat excess leachate. With the improvement of domestic leachate discharge standards and the increase in supervision by environmental protection departments, the frequent occurrence of these problems has intensified the pressure on pollutant control and emission reduction of most domestic landfill leachate treatment plants. Traditional processes such as complete nitrification and denitrification combined with ultrafiltration-reverse osmosis treatment are difficult to meet the treatment target requirements. At present, there is an urgent need to develop a set of more low-carbon, energy-saving, stable and efficient leachate emergency treatment methods and system equipment to meet the above needs. Summary of the invention

[0005] The purpose of the present invention is to improve the domestic landfill leachate discharge standards and to address the problem that traditional processes such as complete nitrification and denitrification combined with ultrafiltration-reverse osmosis treatment are difficult to meet the treatment target requirements. A vehicle-mounted mobile landfill leachate emergency treatment method and system are proposed, which can be flexible, low-carbon, energy-saving, stable and efficient in leachate emergency treatment.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A vehicle-mounted mobile landfill leachate emergency treatment method, characterized in that it comprises the following steps:

[0008] 1) A mobile vehicle-mounted emergency treatment system for leachate is provided, which is provided in a container. The container and the equipment in the container can be integrally installed on a vehicle for emergency treatment operations, and includes: a water inlet pump, a nanofiltration treatment device, a nanofiltration outlet pump with a low organic matter concentration, a nitrite-anaerobic ammonium oxidation synchronous reaction device, a nitrite-anaerobic ammonium oxidation synchronous reaction outlet pump, a denitrification biological filter chamber (DN-BAF), a denitrification outlet pump, an ozone-aerated biological filter chamber (O3-BAF), a nanofiltration outlet pump with a high organic matter concentration, a polyferric coagulation chamber, an air pump, and an ozone generator connected by pipelines;

[0009] 2) The landfill leachate is input into the nanofiltration treatment device through a water inlet pump, and flows into the nanofiltration treatment device for concentration treatment and separation, thereby obtaining nanofiltration effluent containing low organic matter concentration and concentrated liquid with high organic matter concentration;

[0010] 3) The nanofiltration effluent with low organic matter concentration is pumped into a nitrification-anaerobic ammonium oxidation synchronous reaction device equipped with ammonia nitrogen adsorption filler, aerated, and the hydraulic retention time is controlled to achieve nitrification, and the nitrified effluent is passed into an anaerobic ammonium oxidation reactor, aerated, and then anaerobic ammonium oxidation reaction is carried out to achieve denitrification of ammonia nitrogen wastewater;

[0011] At the same time, the nanofiltration concentrate with high organic matter concentration is made to enter the poly-iron coagulation chamber through the nanofiltration outlet pump for coagulation and precipitation;

[0012] 4) The effluent of the anaerobic ammonium oxidation reaction is pumped into the denitrification biological filter (DN-BAF) through the nitrite-anaerobic ammonium oxidation synchronous reaction effluent pump to carry out denitrification reaction to remove part of the organic matter and total nitrogen;

[0013] 5) The effluent from the denitrification biological filter (DN-BAF) enters the ozone-aeration biological filter (O3-BAF) through a water pump, and the ozone generator introduces ozone into the ozone-aeration biological filter (O3-BAF) through an air pump, and the ozone is used to decompose and carbonize the refractory organic matter by the strong oxidizing property of ozone, and then the biofilm in the ozone-aeration biological filter (O3-BAF) is used to further remove the residual organic matter and ammonia nitrogen in the wastewater;

[0014] 6) The supernatant of the polyiron coagulation chamber is introduced into a nitrite-anaerobic ammonium oxidation synchronous reaction device for treatment, the residual water filtered by the ozone-aerated biological filter chamber (O3-BAF) is returned to the denitrification biological filter chamber (DN-BAF) for total nitrogen removal, and then steps (3)-(5) are repeated;

[0015] 7) The effluent that meets the standards after being treated by the ozone-aerated biological filter (O3-BAF) is discharged, and the flocculated sludge in the polyiron coagulation chamber is compressed and discharged.

[0016] The ammonia nitrogen influent load range of the nitrite-anaerobic ammonium oxidation synchronous reaction device (4) described in step 3) is 1000-2500 mg / L.

[0017] The water temperature of the nitrite in step 3) is 25-40° C., the aeration condition is that the dissolved oxygen concentration in the device is 1-5 mg / L, and the hydraulic retention time is 0.5-12 h.

[0018] The ammonia nitrogen adsorption filler in step 3) is natural zeolite, artificial zeolite or a mixture of both.

[0019] Step 3) The dissolved oxygen concentration of the anaerobic ammonium oxidation reaction is controlled at 0.1-3 mg / L; the reaction temperature is 28±5°C, and the hydraulic retention time is 12-24h.

[0020] Step 3) The denitrification load of anaerobic ammonium oxidation reaction is 1.0KgN / (m 3 ·d).

[0021] A vehicle-mounted mobile garbage leachate emergency treatment system for implementing the above method is an integrated system in which all components are arranged in a container, which is convenient for vehicle-mounted movement and operation, and includes: a water inlet pump, a nanofiltration treatment device, a nanofiltration effluent pump with low organic matter concentration, a nitrite-anaerobic ammonium oxidation synchronous reaction device, a nitrite-anaerobic ammonium oxidation synchronous reaction effluent pump, a denitrification biological filter chamber (DN-BAF), a denitrification effluent pump, an ozone-aerated biological filter chamber (O3-BAF), a nanofiltration effluent pump with high organic matter concentration, a polyiron coagulation chamber, an air pump, and an ozone generator connected by pipelines;

[0022] The water inlet pump is connected to the water inlet of the nanofiltration treatment device through a pipeline, the upper water outlet of the nanofiltration treatment device is connected to the water inlet side of the nanofiltration outlet pump with low organic matter concentration, and the lower water outlet of the nanofiltration treatment device is connected to the water inlet side of the nanofiltration outlet pump with high organic matter concentration; the outlet side of the nanofiltration outlet pump with low organic matter concentration is connected to the water inlet of the nitrite-anaerobic ammonium oxidation synchronous reaction device, and the outlet of the nitrite-anaerobic ammonium oxidation synchronous reaction device is connected to the water inlet side of the nitrite-anaerobic ammonium oxidation synchronous reaction outlet pump; the outlet side of the nitrite-anaerobic ammonium oxidation synchronous reaction outlet pump is connected to the water inlet of the denitrification biological filter chamber (DN-BAF), and the outlet of the denitrification biological filter chamber (DN-BAF) is connected to the water inlet side of the denitrification outlet pump; the outlet side of the denitrification outlet pump is connected to the water inlet of the ozone-aeration biological filter chamber (O3-BAF), and the ozone-aeration biological filter chamber (O3-BAF) is connected to the water inlet side of the denitrification outlet pump. The outlet of the nanofiltration effluent pump with high organic matter concentration is connected to the outlet of the nanofiltration concentrate with high organic matter concentration of the nanofiltration treatment device, and its outlet side is connected to the water inlet of the polyiron coagulation chamber; the ozone generator is connected to the air inlet of the ozone-aerated biological filter chamber (O3-BAF) through an air pump; the supernatant outlet of the polyiron coagulation chamber is connected to the water inlet of the nitrite-anaerobic ammonium oxidation synchronous reaction device, and the supernatant in the polyiron coagulation chamber is introduced into the nitrite-anaerobic ammonium oxidation synchronous reaction device for treatment; the outlet of the filtered residual water of the ozone-aerated biological filter chamber (O3-BAF) is connected to the water inlet of the denitrification biological filter chamber (DN-BAF), so that the filtered residual water is refluxed to the denitrification biological filter chamber (DN-BAF) for total nitrogen removal; the mud outlet of the polyiron coagulation chamber compresses the flocculated sludge and discharges it to the outside of the system.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] 1. The vehicle-mounted mobile leachate emergency treatment method and system provided by the present invention is an environmentally friendly treatment process based on anaerobic ammonia oxidation without concentrated liquid discharge. Specifically, it takes the anaerobic ammonia oxidation process as the core, combined with nanofiltration, high-efficiency nitrite-anaerobic ammonia oxidation and chemical oxidation-aerated biological filter chamber, which can effectively remove ammonia nitrogen, total nitrogen and difficult-to-biodegrade organic matter, and realize a truly low-carbon, energy-saving, stable and efficient landfill leachate emergency treatment method and system without concentrated liquid discharge.

[0025] 2. The vehicle-mounted mobile leachate emergency treatment system provided by the present invention has an ingenious structural design and adopts an integrated design. Its various treatment process units, including nanofiltration, high-efficiency nitrite-anaerobic ammonia oxidation and chemical oxidation-aerated biological filter chamber and other main units, are all arranged in a container. The container and the equipment in the container can be installed as a whole on a car for emergency treatment operations, which is convenient for vehicle transportation and operation, has strong mobility, and can be flexibly deployed to meet emergency treatment needs.

[0026] 3. The present invention adopts nanofiltration technology to pretreat the leachate. The nanofiltration effluent flows into the next unit nitrite-anaerobic ammonium oxidation combined reaction tank through a pipeline. The nanofiltration concentrate that retains organic matter and suspended particles flows into the polyiron coagulation sedimentation tank for coagulation treatment. The coagulated sludge is transported out for treatment, and the coagulation supernatant is discharged into the denitrification and denitrification aerated biological filter chamber (DN-BAF).

[0027] 4. The stable and efficient nitrification method based on ammonia nitrogen adsorption medium provided by the present invention is combined with the anaerobic ammonium oxidation process to convert the ammonia nitrogen in the nanofiltration supernatant into nitrite nitrogen, thereby realizing efficient nitrification anaerobic ammonium oxidation treatment of high ammonia nitrogen wastewater. The reaction effluent is discharged into the denitrification and denitrification aerated biological filter chamber (DN-BAF).

[0028] 5. The anaerobic ammonium oxidation technology provided by the present invention is based on anaerobic ammonium oxidizing bacteria, which convert ammonia nitrogen and nitrite in the nitrite reaction filter chamber and coagulation supernatant into nitrogen gas and a very small amount of nitrate, thereby achieving the removal of ammonia nitrogen and total nitrogen in wastewater.

[0029] 6. The present invention adopts a chemical oxidation-aeration biological filter chamber combined water treatment method to achieve non-membrane leachate deep treatment of difficult-to-biodegrade organic matter in the effluent.

[0030] 7. The present invention uses a mature poly-iron coagulation treatment method to remove most of the organic suspended matter and colloids. The organic matter remaining in the coagulation sedimentation supernatant can be connected to the anaerobic BAF in the deep treatment section through the supernatant to supplement the denitrification carbon source, thereby avoiding the discharge of concentrated liquid.

[0031] 8. The present invention adopts anaerobic ammonium oxidation technology, which only needs to convert about half of the ammonia nitrogen into nitrite, which can save nearly 70% of aeration energy consumption compared with complete nitrification reaction; the reaction process does not require the consumption of organic carbon sources, which can greatly save the addition of organic carbon sources; the doubling rate of anaerobic ammonium oxidation is reduced, and the sludge production during the treatment process is small, which can greatly reduce the cost of sludge treatment and disposal. The technology is used for emergency treatment of leachate, which can greatly reduce the energy consumption and reagent costs in the leachate treatment process, and realize economical and efficient denitrification of leachate.

[0032] 9. The stable nitritation method of ammonia nitrogen wastewater based on ammonia nitrogen adsorption material provided by the present invention solves one of the bottlenecks in the application of anaerobic ammonia oxidation technology and can achieve stable ammonia nitrogen nitritation.

[0033] 10. The chemical oxidation-aeration biological filter chamber deep treatment process provided by the present invention can effectively reduce the difficult-to-degrade organic matter and residual ammonia nitrogen and total nitrogen in the biochemical treatment tail water, without discharge of concentrated liquid, and can ensure that the treated water meets the main water quality indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1It is a schematic diagram of the process and system composition of the vehicle-mounted mobile garbage leachate emergency treatment method provided by the present invention.

[0035] In the figure:

[0036] 1. Water inlet pump; 2. Nanofiltration treatment device; 3. Nanofiltration outlet pump for low organic matter concentration; 4. Nitrite-anaerobic ammonium oxidation synchronous reaction device; 5. Nitrite-anaerobic ammonium oxidation synchronous reaction outlet pump; 6. Denitrification biological filter chamber (DN-BAF); 7. Denitrification outlet pump; 8. Ozone-aerated biological filter chamber (O3-BAF); 9. Nanofiltration outlet pump for high organic matter concentration; 10. Polyferric coagulation chamber; 11. Air pump; 12. Ozone generator. DETAILED DESCRIPTION

[0037] The present invention is further described in detail below with reference to examples, but the scope of protection claimed by the present invention is not limited to the scope represented by the examples.

[0038] Embodiment 1:

[0039] See also Figure 1 The vehicle-mounted mobile garbage leachate emergency treatment system provided in this embodiment is an integrated system in which all components are arranged in a container, which is convenient for vehicle-mounted movement and operation. The container and the equipment in the container can be installed as a whole on a car for emergency treatment operations. Specifically, a set of treatment scale is 50m 3 / d, an emergency treatment system for leachate with an ammonia nitrogen concentration of 1000 mg / L and a carbon-nitrogen ratio of 2.

[0040] It includes: a water inlet pump 1, a nanofiltration treatment device 2, a nanofiltration effluent pump 3 with a low organic matter concentration, a nitrite-anaerobic ammonium oxidation synchronous reaction device 4, a nitrite-anaerobic ammonium oxidation synchronous reaction effluent pump 5, a denitrification biological filter chamber (DN-BAF) 6, a denitrification effluent pump 7, an ozone-aerated biological filter chamber (O3-BAF) 8, a nanofiltration effluent pump 9 with a high organic matter concentration, a polyiron coagulation chamber 10, an air pump 11, and an ozone generator 12, which are connected by pipelines.

[0041] Among them, the water inlet pump 1 is connected to the water inlet of the nanofiltration treatment device 2 through a pipeline, the upper water outlet of the nanofiltration treatment device 2 is connected to the water inlet side of the nanofiltration water outlet pump 3 with low organic matter concentration, and the lower water outlet of the nanofiltration treatment device 2 is connected to the water inlet side of the nanofiltration water outlet pump 9 with high organic matter concentration; the outlet side of the nanofiltration water outlet pump 3 with low organic matter concentration is connected to the water inlet of the nitrite-anaerobic ammonium oxidation synchronous reaction device 4, and the outlet side of the nitrite-anaerobic ammonium oxidation synchronous reaction device 4 is connected to the water inlet of the nitrite-anaerobic ammonium oxidation synchronous reaction device 4. The water inlet is connected to the water inlet side of the nitrite-anaerobic ammonium oxidation synchronous reaction water outlet pump 5; the water outlet side of the nitrite-anaerobic ammonium oxidation synchronous reaction water outlet pump 5 is connected to the water inlet of the denitrification biological filter chamber (DN-BAF) 6, and the water outlet of the denitrification biological filter chamber (DN-BAF) 6 is connected to the water inlet side of the denitrification water outlet pump 7; the water outlet side of the denitrification water outlet pump 7 is connected to the water inlet of the ozone-aeration biological filter chamber (O3-BAF) 8, and the ozone-aeration biological filter chamber (O3-BAF )8 outputs the qualified effluent to the outside of the system; the water inlet side of the nanofiltration effluent pump 9 with high organic matter concentration is connected to the water outlet of the nanofiltration concentrate with high organic matter concentration of the nanofiltration treatment device 2, and its water outlet side is connected to the water inlet of the polyiron coagulation chamber 10; the ozone generator 12 is connected to the air inlet of the ozone-aerated biological filter chamber (O3-BAF) 8 via the air pump 11; the supernatant outlet of the polyiron coagulation chamber 10 is connected to the nitrite-anaerobic ammonia oxidation synchronous reaction device The water inlet of device 4 is connected to introduce the supernatant in the polyiron coagulation chamber 10 into the nitrite-anaerobic ammonia oxidation synchronous reaction device 4 for treatment; the outlet of the filtered residual water of the ozone-aerated biological filter chamber (O3-BAF) 8 is connected to the water inlet of the denitrification biological filter chamber (DN-BAF) 6, so that the filtered residual water flows back to the denitrification biological filter chamber (DN-BAF) 6 for total nitrogen removal; the mud outlet of the polyiron coagulation chamber 10 compresses the flocculated sludge and discharges it to the outside of the system.

[0042] A vehicle-mounted mobile garbage leachate emergency treatment method comprises the following steps:

[0043] 1) A mobile vehicle-mounted garbage leachate emergency treatment system is provided, which is arranged in a container and includes: a water inlet pump 1, a nanofiltration treatment device 2, a nanofiltration effluent pump 3 with a low organic matter concentration, a nitrite-anaerobic ammonium oxidation synchronous reaction device 4, a nitrite-anaerobic ammonium oxidation synchronous reaction effluent pump 5, a denitrification biological filter chamber (DN-BAF) 6, a denitrification effluent pump 7, an ozone-aerated biological filter chamber (O3-BAF) 8, a nanofiltration effluent pump 9 with a high organic matter concentration, a polyferric coagulation chamber 10, an air pump 11, and an ozone generator 12 connected by pipelines;

[0044] 2) The landfill leachate is input into the nanofiltration treatment device 2 through the water inlet pump 1, and flows into the nanofiltration treatment device 2 for concentration treatment and separation, thereby obtaining nanofiltration effluent with low organic matter concentration and concentrated liquid with high organic matter concentration;

[0045] 3) The nanofiltration effluent with low organic matter concentration is passed through the nanofiltration effluent pump 3 into the nitrification-anaerobic ammonium oxidation synchronous reaction device 4 equipped with ammonia nitrogen adsorption filler, aerated, and the hydraulic retention time is controlled to achieve nitrification, and the nitrified effluent is passed into the anaerobic ammonium oxidation reactor, aerated, and then the anaerobic ammonium oxidation reaction is carried out to achieve denitrification of ammonia nitrogen wastewater;

[0046] Specifically, the ammonia nitrogen influent load range of the nitrite-anaerobic ammonia oxidation synchronous reaction device 4 is 1000-2500 mg / L; the water temperature of nitrite is 25-40°C, the aeration condition is that the dissolved oxygen concentration in the device is 1-5 mg / L, and the hydraulic retention time is 0.5-12h; the ammonia nitrogen adsorption filler is a mixture of one or two of natural zeolite and artificial zeolite, and in this embodiment, it is natural zeolite; the dissolved oxygen concentration of the anaerobic ammonia oxidation reaction is controlled at 0.1-3 mg / L; the reaction temperature is 28±5°C, and the hydraulic retention time is 12-24h; the denitrification load of the anaerobic ammonia oxidation reaction is 1.0KgN / (m 3 d);

[0047] At the same time, the nanofiltration concentrate with high organic matter concentration is made to enter the poly-iron coagulation chamber 10 through the nanofiltration outlet pump 9 for coagulation and precipitation;

[0048] 4) The effluent of the anaerobic ammonium oxidation reaction is pumped through the nitrite-anaerobic ammonium oxidation synchronous reaction effluent pump 5 to enter the denitrification biological filter (DN-BAF) 6 for denitrification reaction to remove part of the organic matter and total nitrogen;

[0049] 5) The effluent of the denitrification biological filter chamber (DN-BAF) 6 enters the ozone-aeration biological filter chamber (O3-BAF) 8 through the water pump 7, and the ozone generator 12 introduces ozone into the ozone-aeration biological filter chamber (O3-BAF) 8 through the air pump 11, and the ozone is used to decompose, destroy and carbonize the difficult-to-degrade organic matter by the strong oxidizing property of ozone, and then the biofilm in the ozone-aeration biological filter chamber (O3-BAF) 8 is used to further remove the residual organic matter and ammonia nitrogen in the wastewater;

[0050] 6) The supernatant of the polyiron coagulation chamber 10 is introduced into the nitrite-anaerobic ammonium oxidation synchronous reaction device 4 for treatment, the residual water filtered by the ozone-aerated biological filter chamber (O3-BAF) 8 is returned to the denitrification biological filter chamber (DN-BAF) 6 for total nitrogen removal, and then steps (3)-(5) are repeated;

[0051] 7) The effluent that meets the standards after being treated by the ozone-aerated biological filter chamber (O3-BAF) 8 is discharged, and the flocculated sludge in the poly-iron coagulation chamber 10 is compressed and discharged.

[0052] This embodiment provides a system and method, the processing scale of which is 50m 3 / d, a leachate treatment system and method with an ammonia nitrogen concentration of 1000 mg / L and a carbon-nitrogen ratio of 2. After actual testing, compared with the currently commonly used leachate emergency treatment equipment and technology, similar projects can save 10,000 yuan in engineering investment / m 3 , including saving about 8 yuan / m2 in operating costs 3 Electricity fee and 15 yuan / m 3 The invention can be transported and operated by vehicle, which is convenient and fast and suitable for emergency disposal needs.

[0053] Example 2

[0054] The vehicle-mounted mobile garbage leachate emergency treatment method and system provided in this embodiment are basically the same as those in the embodiment, except that: it is specifically a set of treatment scale of 10m 3 / d, anaerobic ammonia oxidation reaction to treat the leachate treatment system with a nitrogen load of 1.0KgN / (m3·d), an ammonia nitrogen removal rate of more than 85%, a total nitrogen removal rate of more than 75%, and CODcr≤100mg / L.

[0055] In this embodiment, the ammonia nitrogen adsorption filler described in step 3) is artificial zeolite. In other embodiments, a mixture of natural zeolite and artificial zeolite can also be used, and the technical effect of the present invention can be achieved.

[0056] After actual testing, compared with the currently commonly used leachate emergency treatment equipment and technology, similar projects can save engineering investment of 12,000 yuan / m 3 , including saving about 8.5 yuan / m2 in operating costs 3 Electricity fee and 15.5 yuan / m 3 It reduces the cost of additional carbon sources and has broad application prospects.

[0057] The emergency treatment method and system provided by the present invention is a high-stability treatment process for landfill leachate based on anaerobic ammonium oxidation technology. The leachate is first subjected to nanofiltration treatment, and the macromolecular organic matter is concentrated and separated to obtain nanofiltration effluent with low organic matter concentration and concentrated liquid with high organic matter concentration; the nanofiltration effluent enters nitrite-anaerobic ammonium oxidation treatment to significantly remove ammonia nitrogen and total nitrogen therein, and the nanofiltration concentrated liquid is subjected to polyferric coagulation treatment, and the supernatant is mixed with the nitrite-anaerobic ammonium oxidation treatment effluent for subsequent deep treatment, and the coagulated sludge is transported out for disposal. In the denitrification aerated biological filter (DN-BAF), the residual organic matter in the coagulation supernatant is used to denitrify the anaerobic ammonia oxidation effluent and the nitrate ions returned from the ozone aerated biological filter (O3-BAF) effluent to remove part of the organic matter and total nitrogen; the effluent from the DN-BAF enters the O3-BAF again, and the strong oxidizing property of ozone is used to decompose, destroy and carbonize the difficult-to-degrade organic matter, and the biofilm in the BAF is used to further remove the residual organic matter and ammonia nitrogen in the wastewater, and the effluent is finally discharged after treatment to meet the standards. The present invention takes the anaerobic ammonia oxidation technology as the core, combines nanofiltration, high-efficiency nitrite-anaerobic ammonia oxidation and chemical oxidation-aerated biological filter processes, stably and efficiently removes ammonia nitrogen, total nitrogen and difficult-to-biodegrade organic matter, increases the reaction volume load, and does not produce concentrated liquid, does not require an external carbon source, saves aeration volume, and reduces sludge production, thereby realizing vehicle-mounted mobile emergency treatment of garbage leachate.

[0058] The method and system provided by the present invention use a self-developed nitrite-anaerobic ammonium oxidation process for denitrification because there is no concentrated liquid discharge. Ultimately, ammonia nitrogen and total nitrogen are converted into nitrogen and discharged into the atmosphere. This process can be carried out at room temperature without the need for additional heating devices and biogas collection devices, and both the capital construction cost and the operating cost are relatively low. True energy saving and high efficiency can be achieved. The present invention uses a self-developed integrated ozone-aerated biological filter chamber process, which can ensure that effluent organic matter meets the discharge standards and can operate stably.

[0059] The present invention can be used for emergency treatment. The system equipment adopts an integrated container design, which occupies a small area and has strong flexibility. The transportation and operation costs are controllable, the operation effect is reliable, the operation process is stable, and it can be carried out at room temperature. There is no need to add a carbon source and there is no infrastructure cost. It is an integrated vehicle-mounted equipment that can meet emergency needs, especially to alleviate the emission pressure of landfills in rainstorm weather.

[0060] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, the system design and method steps that are the same or similar to the above-mentioned embodiments of the present invention are within the protection scope of the present invention.

Claims

1. A vehicle-mounted mobile landfill leachate emergency treatment method, characterized in that: The following steps are involved: 1) A mobile vehicle-mounted emergency treatment system for leachate is provided, the system being arranged in a container and comprising: an inlet pump (1), a nanofiltration treatment device (2), a nanofiltration outlet pump for low organic matter concentration (3), a nitrite-anaerobic ammonium oxidation synchronous reaction device (4), a nitrite-anaerobic ammonium oxidation synchronous reaction outlet pump (5), a denitrification biological filter chamber (DN-BAF) (6), a denitrification outlet pump (7), an ozone-aerated biological filter chamber (O3-BAF) (8), a nanofiltration outlet pump for high organic matter concentration (9), a polyferric coagulation chamber (10), an air pump (11), and an ozone generator (12); 2) inputting the landfill leachate into the nanofiltration treatment device (2) through the water inlet pump (1), allowing the landfill leachate to flow into the nanofiltration treatment device (2) for concentration treatment and separation, thereby obtaining nanofiltration effluent containing a low organic matter concentration and a concentrated liquid containing a high organic matter concentration; 3) The nanofiltration effluent with low organic matter concentration is passed through the nanofiltration effluent pump (3) into a nitrification-anaerobic ammonium oxidation synchronous reaction device (4) equipped with ammonia nitrogen adsorption filler, aerated, and the hydraulic retention time is controlled to achieve nitrification, and the nitrified effluent is passed into the anaerobic ammonium oxidation reactor, aerated, and then the anaerobic ammonium oxidation reaction is carried out to achieve denitrification of ammonia nitrogen wastewater; At the same time, the nanofiltration concentrate with a high organic matter concentration is passed through a nanofiltration effluent pump (9) and enters a polyiron coagulation chamber (10) for coagulation and precipitation; 4) The effluent from the anaerobic ammonium oxidation reaction is pumped through the nitrite-anaerobic ammonium oxidation synchronous reaction effluent pump (5) to enter the denitrification biological filter (DN-BAF) (6) for denitrification reaction to remove part of the organic matter and total nitrogen; 5) The effluent from the denitrification biofilter (DN-BAF) (6) enters the ozone-aeration biofilter (O3-BAF) (8) through a water pump (7); the ozone generator (12) introduces ozone into the ozone-aeration biofilter (O3-BAF) (8) through an air pump (11); the ozone is used to decompose, destroy and carbonize the refractory organic matter by utilizing the strong oxidizing property of ozone; and the biofilm in the ozone-aeration biofilter (O3-BAF) (8) is used to further remove the residual organic matter and ammonia nitrogen in the wastewater; 6) The supernatant of the polyiron coagulation chamber (10) is introduced into the nitrite-anaerobic ammonium oxidation synchronous reaction device (4) for treatment, and the residual water filtered by the ozone-aerated biological filter chamber (O3-BAF) (8) is returned to the denitrification biological filter chamber (DN-BAF) (6) for total nitrogen removal, and then steps (3) to (5) are repeated; 7) The effluent that meets the standards after being treated by the ozone-aerated biological filter chamber (O3-BAF) (8) is discharged, and the flocculated sludge in the polyiron coagulation chamber (10) is compressed and discharged.

2. The vehicle-mounted mobile landfill leachate emergency treatment method according to claim 1, characterized in that: The ammonia nitrogen influent load range of the nitrite-anaerobic ammonium oxidation synchronous reaction device (4) in step 3) is 1000-2500 mg / L.

3. The vehicle-mounted mobile landfill leachate emergency treatment method according to claim 1 is characterized in that: The water temperature of the nitrite in step 3) is 25-40°C, the aeration condition is that the dissolved oxygen concentration in the device is 1-5 mg / L, and the hydraulic retention time is 0.5-12h.

4. The vehicle-mounted mobile landfill leachate emergency treatment method according to claim 1 is characterized in that: The ammonia nitrogen adsorption filler in step 3) is natural zeolite, artificial zeolite or a mixture of the two.

5. The vehicle-mounted mobile landfill leachate emergency treatment method according to claim 1, characterized in that: Step 3) The dissolved oxygen concentration of the anaerobic ammonium oxidation reaction is controlled at 0.1-3 mg / L; the reaction temperature is 28±5°C, and the hydraulic retention time is 12-24h.

6. The vehicle-mounted mobile emergency treatment method for landfill leachate according to claim 1 is characterized in that: Step 3) The denitrification load of anaerobic ammonium oxidation reaction is 1.0KgN / (m 3 ·d).

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