CN112679019B - Garbage leachate total treatment method and system - Google Patents
Garbage leachate total treatment method and system Download PDFInfo
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Abstract
The invention discloses a garbage leachate total treatment method and a total treatment system, which comprise the following steps: s1, pretreating the landfill leachate, and introducing the landfill leachate into a DTRO system for membrane separation treatment to obtain qualified discharge water and landfill leachate concentrated solution; s2, introducing the landfill leachate concentrated solution into a DTCOD system to obtain DTCOD permeate and DTCOD concentrated solution; s3, carrying out evaporative crystallization treatment on the DTCOD concentrated solution to obtain a product for outward transportation treatment; s4, performing enhanced deamination treatment on the DTCOD permeate to obtain enhanced deamination water; and S5, carrying out deep electrolytic oxidation treatment on the enhanced deamination water to obtain discharge water. The invention can remove pollutants such as ammonia nitrogen, organic matters and the like in the landfill leachate, the produced water is discharged after reaching the standard, the discharge rate reaches 98 percent, the problems of tail end concentrated solution treatment and high-time produced water recovery are solved, the system is stable in operation and high in treatment efficiency, the operation cost is lower than that of the existing landfill leachate treatment technology, and the full-scale treatment of the landfill leachate is realized.
Description
Technical Field
The invention relates to the technical field of landfill leachate treatment, in particular to a full-scale treatment method and a full-scale treatment system for landfill leachate.
Background
Under the influence of various factors such as the type of landfill, the landfill method, the scale of the landfill, the landfill period, the weather change and the like, the leachate of the domestic garbage landfill has the characteristics of large water quality and water quantity change, complex components, high organic matter concentration, high NH 3-N concentration, higher salinity and heavy metal content and the like, has serious pollution problem to the surrounding environment, and can be discharged into a specified receiving water body or recycled after being strictly treated to reach the relevant national and local standards and specifications.
At present, the landfill leachate treatment generally adopts a combined process of 'pretreatment + biological treatment + membrane treatment', but because ammonia nitrogen, COD and salt in the leachate of an old landfill are high, the efficiency of the biological treatment is extremely low, and even a biochemical system can not normally operate. Therefore, the membrane treatment process has become the mainstream process of landfill leachate treatment, but the membrane treatment can generate about 30% -50% of concentrated solution, and the most common concentrated solution treatment mode at present is recharging.
Because a large amount of salts and trace heavy metals are enriched in the concentrated solution, the problem of salt accumulation is increasingly prominent due to long-term recharge, so that the system recovery rate is lower and lower, the treatment capacity is smaller and smaller, and the stock leachate is more and more, namely the landfill leachate cannot be treated in full quantity, and huge environmental protection pressure is brought to garbage treatment enterprises. The existing concentrated solution treatment technology mainly adopts evaporation as a main part, and comprises MVR evaporation, low-temperature evaporation and the like, the operation cost of evaporation treatment reaches more than 300 yuan/ton of water, and the concentrated solution treatment technology becomes the bottleneck of development of the garbage treatment industry. Therefore, the development of low-cost garbage leachate full-scale treatment technology is urgently needed to solve the industrial pain problem of garbage disposal enterprises.
Chinese patent CN111661979A discloses a method and equipment for treating leachate as a resource, which can provide comprehensive resource utilization of leachate with extremely high concentration of pollutants and realize zero discharge of leachate, but the method uses a gaseous separation membrane to deaminate, which produces a large amount of ammonium sulfate by-products with low concentration and low acidity, which cannot be directly used as fertilizer and needs additional disposal.
Therefore, the prior art still lacks a full-scale treatment process of the landfill leachate, and active development of researchers is urgently needed.
Disclosure of Invention
The invention aims to: aiming at the existing problems, the invention provides a garbage leachate full treatment method and a full treatment system, the garbage leachate full treatment method and the full treatment system can remove pollutants such as ammonia nitrogen, organic matters and the like in the garbage leachate, the produced water is discharged after reaching the standard, the discharge rate reaches 98%, a small amount of concentrated solution is evaporated to obtain solid, and the solid is transported and disposed, so that the full treatment of the garbage leachate is realized, the operation cost is lower than that of the existing garbage leachate treatment technology, and the defects of the prior art are overcome.
The technical scheme adopted by the invention is as follows: a full-scale treatment method of landfill leachate is characterized by comprising the following steps:
s1, pretreating the landfill leachate, and introducing the pretreated landfill leachate into a DTRO system for membrane separation treatment to obtain qualified discharge water and landfill leachate concentrated solution;
s2, introducing the landfill leachate concentrated solution into a DTCOD system to obtain DTCOD permeate and DTCOD concentrated solution;
s3, carrying out evaporative crystallization treatment on the DTCOD concentrated solution to obtain an external product;
s4, performing enhanced deamination treatment on the DTCOD permeate to obtain enhanced deamination water;
and S5, carrying out deep electrolytic oxidation treatment on the enhanced deamination produced water to obtain discharge water, and finishing the full treatment of the landfill leachate.
In the process of the invention, [ H ] generated during electrolysis is used]、[O]And a large amount of hydroxyl free radicals play a role in chemical oxidation reduction of pollutants of the landfill leachate after front-end treatment, and can thoroughly oxidize and decompose organic matters in water into CO2And H2And O, ensuring qualified discharge of external drainage. The full-scale treatment method for the landfill leachate can not cause the problem of salt accumulation, the system recovery rate and the treatment capacity are stable and high level is kept, the full-scale treatment of the landfill leachate is realized, the operation cost is lower than that of the existing landfill leachate treatment technology, and the technical advantages are very obvious.
In the method for treating the total amount of the landfill leachate, in order to deeply realize the complete filtration of the landfill leachate, when the landfill leachate is pretreated, a quartz sand filter is used for removing partial impurities in the landfill leachate. Furthermore, during the filtering process of the quartz sand filter, the back washing frequency is judged by the pressure difference of the inlet end and the outlet end of the quartz sand filter, and the pressure difference threshold value can be set to be 0.25 MPa. During backwashing, the water can be washed independently or independently, the gas washing and the water washing can be used for backwashing simultaneously, the backwashing mode is flexibly changed according to the actual operation condition, pollutants can be cleared away in time after backwashing, and therefore the garbage leachate can be pretreated to obtain cleaner garbage leachate.
Further, to better achieve backlashWashing, wherein the gas washing strength in the back washing process of the quartz sand filter is 10-20L/(m)2S) back washing pressure of 0-0.3MPa and back washing water washing strength of 5-20L/(m)2S) the pressure of the backwash water is 0.15-0.3 MPa. The specific parameters are obtained by adjusting according to actual needs.
In the full-scale treatment method of the landfill leachate, in order to improve the membrane separation effect and efficiency of the DTRO system, the landfill leachate needs to be pretreated, and the pretreatment method is obtained through a plurality of test summaries, when the pH value is controlled within the range of 5.5-6.5 in the pretreatment process, the concentration and separation effect of humic acid, divalent salt and other high-valence ions in the landfill leachate is the best, and the membrane separation efficiency of the DTRO system is the highest. The discharged water after the membrane separation of the DTRO system meets the standard of table 2 or even table 3 in the pollution control Standard of domestic refuse landfill (GB 16889-2008), and can be directly discharged.
In order to further realize the high-power concentration of the leachate, the landfill leachate filtered by the quartz sand filter is added with a scale inhibitor, then is filtered by a core filter with the filtering precision of 5um, and then is subjected to membrane separation treatment by a DTRO system. The adding ratio of the scale inhibitor is determined according to the content of sulfate and carbonate in the raw water.
In the full-scale treatment method of the landfill leachate, the pH value of the DTCOD permeate is adjusted to 9-11 before the DTCOD permeate is subjected to enhanced deamination in order to improve the ammonia nitrogen removal effect and efficiency. The DTCO permeate liquid is obtained by a plurality of tests, when the pH value of the DTCO permeate liquid is in the range of 9-11, the ammonia nitrogen removal effect is excellent, the efficiency is high, and the ammonia nitrogen content can be reduced to be within 8 mg/L.
In order to further improve the recovery rate, the obtained DTRO concentrated solution is filtered by a cartridge filter and then is introduced into a DTCOD system. After the treatment of the cartridge filter and the DTCOD, the overall produced water recovery rate reaches 98 percent, the recovery rate is high and the operation is stable.
In the full-scale treatment method of the landfill leachate, in order to improve the removal effect of organic matters, before the deep electrolytic oxidation treatment is carried out on the enhanced deamination water, the pH value of the deep electrolytic oxidation inlet water is adjusted to be 7-9. Under the alkalescent environment, the organic matter is partially ionized or hydrolyzed into a free state, so that the organic pollutants are subjected to direct electrochemical reaction (heterogeneous phase) or indirect electrochemical conversion (homogeneous phase) on the electrode, and then are reduced or removed from the wastewater, thereby achieving the purpose of deep degradation and conversion of the organic pollutants.
Further, the current density in the deep electrolytic oxidation treatment process is 350-500A/m2And the flow velocity of the water body passing through the electrode is between 1 and 5 m/s.
The invention also comprises a garbage leachate full-scale treatment system, which comprises an adjusting tank and is characterized in that the adjusting tank is connected with a pretreatment system through a lift pump, the pretreatment system is used for pretreating garbage leachate, the pretreatment system is communicated with a DTRO system, the DTRO system comprises a DTRO membrane assembly, the inlet end of the DTRO membrane assembly is communicated with the pretreatment system, the permeate outlet end of the DTRO membrane assembly is connected with an external discharge port, the concentrate outlet end of the DTRO membrane assembly is communicated with the water inlet end of the DTCOD membrane treatment system, the permeate outlet end of the DTCOD membrane treatment system is communicated with a reinforced deamination system, the concentrate outlet end of the DTCOD system is communicated with an evaporative crystallization system, the evaporative crystallization system comprises an MVR evaporation system and a drying system, the outlet end of the MVR evaporation system is communicated with the drying system, and the drying system is used for drying materials from the MVR evaporation system, the outlet end of the intensified deamination system is communicated with a deep electrolytic oxidation system, and the outlet end of the deep electrolytic oxidation system is communicated with an external discharge port.
The garbage leachate total treatment system can remove pollutants such as ammonia nitrogen, organic matters and the like in garbage leachate, the produced water is discharged after reaching the standard, the discharge rate reaches 98%, the problems of tail end concentrated solution treatment and high-power produced water recovery are solved, the garbage leachate total treatment is realized, the operation cost is lower than that of the existing garbage leachate treatment technology, and the defects of the prior art are overcome.
Furthermore, the outlet end of the pretreatment system is connected with a quartz sand filter, the output end of the quartz sand filter is connected with a core type filter, and the output end of the core type filter is connected with the DTRO membrane assembly.
Furthermore, a condensed water outlet end of the MVR evaporation system or/and the drying system is communicated with an enhanced deamination system.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, the DTRO system and the DTCOD system are combined, so that the concentration and separation of the landfill leachate can be highly realized, the water production is treated by adopting enhanced deamination and deep electrolytic oxidation, the concentrated solution is treated by evaporative crystallization, the full treatment of the landfill leachate and high-time recycling of the water production are realized while high recovery rate is obtained, and the technical advantages are very obvious.
2. According to the invention, the quartz sand filter is utilized to fully remove suspended matters in the landfill leachate, and meanwhile, the frequency of rinsing with clear water and removing impurities by gas washing is set through the pressure difference, so that pollutants can be discharged from the system in time, the system can normally operate, and the long-term stable operation of subsequent treatment processes can be ensured.
3. The invention utilizes the generated H in the electrolytic process]、[O]And a large amount of hydroxyl free radicals play a role in chemical oxidation reduction of pollutants of the landfill leachate after front-end treatment, and can thoroughly oxidize and decompose organic matters in water into CO2And H2And O, ensuring qualified discharge of external drainage.
4. According to the invention, under an alkalescent environment, the organic matter is partially ionized or hydrolyzed into a free state, so that the organic pollutants are subjected to direct electrochemical reaction (heterogeneous phase) or indirect electrochemical conversion (homogeneous phase) on the electrode, and then are reduced or removed from the wastewater, thus the purpose of deep degradation and conversion of the organic pollutants is achieved, and the electrolytic oxidation treatment effect is improved.
5. The garbage leachate total treatment method and the garbage leachate total treatment system can remove pollutants such as ammonia nitrogen, organic matters and the like in the garbage leachate, the produced water is discharged after reaching the standard, the discharge rate reaches 98%, the problems of tail end concentrated solution treatment and high-time produced water recovery are solved, the system is stable in operation and high in removal efficiency, the operation cost is lower than that of the existing garbage leachate treatment technology, and the garbage leachate total treatment is realized.
Drawings
FIG. 1 is a schematic view of a process flow of a landfill leachate total treatment system of the present invention;
FIG. 2 is a schematic view of another landfill leachate total treatment system process flow of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is worth to put forward that the DTRO and the MVR related to the invention are all the prior proper technical terms, namely a disc tube type reverse osmosis membrane and a steam mechanical recompression. The DTCOD is a disc tube type COD material separation membrane. Therefore, these terms are not originally created or named after the inventor, and the exact meaning, structural configuration and operation principle of these terms will be clear to those skilled in the art, so that they do not need to be described in detail in this invention.
Example 1
As shown in figure 1, the garbage leachate full treatment system comprises a regulating tank, the garbage leachate is connected with a pretreatment system through a lift pump, the pretreatment system is connected with a DTRO system, the DTRO system comprises a DTRO membrane module, the inlet end of the DTRO membrane component is communicated with the pretreatment system, the permeate outlet end of the DTRO membrane component is connected with the external discharge port, the concentrate outlet end of the DTRO membrane component is communicated with the water inlet end of the DTCO membrane treatment system, the permeate outlet end of the DTCOD membrane processing system is communicated with a strengthening deamination system, the concentrate outlet end of the DTCOD system is communicated with an evaporative crystallization system, the evaporative crystallization system comprises an MVR evaporation system and a drying system, the outlet end of the MVR evaporation system is communicated with the drying system, the drying system is used for drying materials from the MVR evaporation system, the outlet end of the enhanced deamination system is communicated with the deep electrolytic oxidation system, and the outlet end of the deep electrolytic oxidation system is communicated with an external discharge port. And the MVR evaporation system and the condensed water outlet end of the drying system are communicated with an enhanced deamination system.
The treatment process of the garbage leachate full-scale treatment system comprises the following steps:
s1, conveying the landfill leachate in the adjusting tank into a pretreatment system through a lifting pump for pretreatment, and adjusting the pH value of the landfill leachate to be between 5.5 and 6.5 so as to be beneficial to the subsequent treatment of humic acid and divalent salt (such as Ca)2+、SO4 2－) Other high valence state ions are concentrated and separated;
s2, conveying the pretreated landfill leachate into a DTRO system for treatment, and treating by a DTRO component in the DTRO system to obtain qualified discharge water and landfill leachate concentrated solution, wherein the qualified discharge water is directly discharged outwards, and the landfill leachate concentrated solution is continuously treated;
s3, introducing the landfill leachate concentrated solution into a DTCOD system for processing, and concentrating and separating under the pressure condition of 4-8.5 MPa to obtain DTCOD permeate and DTCOD concentrated solution;
s3, introducing the DTCOD concentrated solution into an MVR evaporation system for evaporation treatment to obtain condensed water and mother liquor, introducing the mother liquor into a drying system for drying, and carrying out outward treatment on the obtained product;
s4, adjusting the pH value of the DTCOD permeate to 9-11, and introducing the DTCOD permeate, the MVR system and the condensed water of the drying system into a reinforced deamination system for treatment to obtain reinforced deamination water;
s5, adjusting the pH value of the enhanced deamination water to 7-9, performing deep electrolytic oxidation treatment on the enhanced deamination water to obtain discharge water, finishing the full treatment of the landfill leachate, and controlling the current density to be 350-500A/m in the deep electrolytic oxidation treatment process2And the flow velocity of the water body passing through the electrode is between 1 and 5 m/s.
Example 2
The embodiment 2 is the same as the embodiment 1, except that in order to deeply realize complete filtration of the landfill leachate, when the landfill leachate is pretreated, a part of impurities in the landfill leachate are removed through a quartz sand filter, namely, the pretreatment system is connected with the quartz sand filter, and the output end of the quartz sand filter is connected with DTAnd (4) an RO membrane module. Furthermore, during the filtering process of the quartz sand filter, the back washing frequency is judged by the pressure difference of the inlet end and the outlet end of the quartz sand filter, the threshold value of the pressure difference can be set to be 0.25MPa, and the air washing strength of the quartz sand filter during the back washing process is 10-20L/(m)2S) the back washing pressure is 0-0.3MPa, and the strength of the back washing water is 5-20L/(m)2S) the pressure of the backwash water is 0.15-0.3 MPa. The specific parameters are obtained by adjusting according to actual needs.
The treatment process of the garbage leachate full-scale treatment system comprises the following steps:
s1, conveying the landfill leachate in the adjusting tank into a pretreatment system through a lifting pump for pretreatment, and adjusting the pH value of the landfill leachate to be between 5.5 and 6.5 so as to be beneficial to the subsequent treatment of humic acid and divalent salt (such as Ca)2+、SO4 2－) Other high valence state ions are concentrated and separated;
s2, conveying the pretreated landfill leachate to a quartz sand filter for filtering, conveying the filtered filtrate to a DTRO system for processing, and processing by a DTRO component in the DTRO system to obtain qualified discharge water and landfill leachate concentrated solution, wherein the qualified discharge water is directly discharged outwards, and the landfill leachate concentrated solution is continuously processed;
s3, introducing the landfill leachate concentrated solution into a DTCOD system for processing, and concentrating and separating under the pressure condition of 4-8.5 MPa to obtain DTCOD permeate and DTCOD concentrated solution;
s3, introducing the DTCOD concentrated solution into an MVR evaporation system for evaporation treatment to obtain condensed water and mother liquor, introducing the mother liquor into a drying system for drying, and externally treating the obtained product;
s4, adjusting the pH value of the DTCOD permeate to 9-11, and introducing the DTCOD permeate, the MVR system and the condensed water of the drying system into a reinforced deamination system for treatment to obtain reinforced deamination water;
s5, adjusting the pH value of the enhanced deamination water to 7-9, performing deep electrolytic oxidation treatment on the enhanced deamination water to obtain discharge water, finishing the full treatment of the landfill leachate, and controlling the current density to be 350-500A/m in the deep electrolytic oxidation treatment process2Water channel of water bodyThe flow rate through the electrodes is between 1 and 5 m/s.
Example 3
Example 3 is the same as example 2 except that in order to further achieve high concentration of contaminants, the output of the silica sand filter is connected to a cartridge filter, and the output of the cartridge filter is connected to the DTRO membrane module. Adding a scale inhibitor into the landfill leachate filtered by the quartz sand filter, filtering by a core filter with the filtering precision of 5um, and then carrying out membrane separation treatment by a DTRO system. The adding ratio of the scale inhibitor is determined according to the content of sulfate and carbonate in raw water, and the preferable weight ratio of carbonate to sulfate is generally as follows: 7-14 parts of scale inhibitor: 1 in a ratio of 1.
Example 4
Example 4 is the same as example 3, except that, in order to further improve the recovery rate, the DTRO concentrate obtained is filtered by a cartridge filter and then introduced into the dtmod system, that is, the concentrate outlet end of the DTRO membrane module is connected to the cartridge filter, and the output end of the cartridge filter is connected to the dtmod system, as shown in fig. 2.
Comparative example 1
Comparative example 1 is the same as example 4 except that the MVR evaporation system was replaced with a plate and frame filter press system and the rest of the process setup, steps and operation were the same.
Comparative example 2
Comparative example 2 is the same as example 4 except that anthracite coal was used as the filtration layer in place of the silica sand filter, and the rest of the process setup, procedure and operation were the same.
Comparative example 3
Comparative example 3 is the same as example 4 except that the existing ozonation system was used in place of the deep electrolytic oxidation system and the rest of the process setup, procedure and operation were the same.
The recovery rates of the respective proportions and example 4 were counted, as well as the chemical oxygen demand and ammonia nitrogen of the final discharge water, to obtain table 1:
TABLE 1 comparison of the results of different processes
According to the results shown in table 1, when the filter layer of example 4 is replaced with the filter layer of comparative example 3, the backwashing frequency is increased by 30%, which shows that the quartz sand filter has a significant positive effect and the technical effect is significantly better than that of a common filter device; comparing the example 4 with the comparative example 3, when the existing ozone oxidation system is used to replace the deep electrolytic oxidation system, the ammonia nitrogen in the effluent is obviously high, and the energy consumption is high, so that the content of organic matters is mainly influenced by oxidation treatment, the energy consumption of ozone oxidation is obviously higher than that of deep electrolytic oxidation, and meanwhile, the treatment effect of the existing ozone oxidation is not as good as that of the deep electrolytic oxidation of the invention.
Therefore, as can be shown in table 1, the method for the total treatment of landfill leachate provided by the invention has the advantages that the removal rate of COD of the landfill leachate is more than 99%, the removal rate of ammonia nitrogen is more than 95%, the recovery rate of the obtained discharge water reaches 98%, the COD is far less than 60mg/l, the ammonia nitrogen is less than 5mg/l, no by-product is generated, a feasible scheme is provided for treating high-concentration and difficult-degradation landfill leachate, and the superiority of the method is proved.
Further, the statistics of the quality of the percolate at each stage of the treatment process are shown in table 2 after a plurality of times of experimental statistics:
TABLE 2 quality of percolate at each stage of total treatment process
| Serial number | Processing unit | CODcr(mg/l) | Ammonia nitrogen (mg/l) | pH |
| 1 | Garbage leachate | 5000－15000 | 1500－2500 | 5－8 |
| 2 | DTRO system | 0－100 | 0－20 | 6－7 |
| 3 | Landfill leachate concentrated solution | 6000－20000 | 2000－5000 | 6－7 |
| 4 | DTCO system | 500－5000 | 1000－3000 | 6－7 |
| 5 | Enhanced deamination system | 100－1000 | 0－100 | 9－11 |
| 6 | Electrolytic oxidation system | 0－60 | 0－5 | 7－9 |
| 7 | Emission limit (Standard of Table 3) | 60 | 5 | 6－9 |
As can be seen from Table 2, the landfill leachate contains a large amount of pollutants, wherein the CODcr content is 5000-15000 mg/l, and the ammonia nitrogen content is 1500-2500 mg/l. The leachate can be treated in full quantity by the method and the equipment provided by the invention, so that the technical level of the leachate treatment industry is improved while the pain problem of the current leachate industry is solved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. A full-scale treatment method of landfill leachate is characterized by comprising the following steps:
s1, when the landfill leachate is pretreated, adjusting the pH value of the landfill leachate to 5.5-6.5, introducing the pretreated landfill leachate into a DTRO system for membrane separation treatment to obtain qualified discharge water and landfill leachate concentrated solution;
s2, introducing the landfill leachate concentrated solution into a DTCOD system to obtain DTCOD permeate and DTCOD concentrated solution;
s3, carrying out evaporation crystallization treatment on the DTCOD concentrated solution to obtain a product for outward transportation treatment;
s4, adjusting the pH value of the DTCOD permeate to 9-11, and performing enhanced deamination treatment on the DTCOD permeate to obtain enhanced deamination water;
s5, adjusting the pH value of the enhanced deamination water to 7-9, and performing deep electrolytic oxidation treatment on the enhanced deamination water to obtain discharge water, wherein the current density in the deep electrolytic oxidation treatment process is 350-500A/m2The flow velocity of the water body passing through the electrodes is between 1 and 5m/s, and the full treatment of the landfill leachate is finished;
wherein, the DTRO system includes the DTRO membrane module, the entrance point switch-on pretreatment systems of DTRO membrane module, the outer row of mouth is connected to the permeate liquid exit end of DTRO membrane module, and the concentrate exit end switch-on DTCO system's of DTRO membrane module end of intaking, the DTCO system includes dish tubular COD material separation membrane module, the deamination system is reinforceed to the permeate liquid exit end switch-on of DTCO system, and the concentrate exit end switch-on evaporation crystal system of DTCO system, the evaporation crystal system includes MVR evaporation system and drying system, MVR evaporation system's exit end switch-on drying system, drying system is used for carrying out drying process to the material that comes from MVR evaporation system, the exit end switch-on degree of depth electrolytic oxidation system of deamination system is advanced, the outer row of mouth is put through to the exit end of degree of depth electrolytic oxidation system.
2. The method of claim 1, wherein the landfill leachate is pretreated to remove a portion of impurities in the landfill leachate through a quartz sand filter.
3. The total treatment method of landfill leachate according to claim 1, wherein during the filtration process of the quartz sand filter, the back washing frequency is determined by the pressure difference between the inlet and outlet of the quartz sand filter, and the back washing is performed by combining the gas washing and the water washing; the gas washing strength of the quartz sand filter in the back washing process is 10-20L/(m)2S), the back washing pressure is 0-0.3MPa, and the back washing water washing strength is 5-20L/(m)2S), the pressure of the backwash water is 0.15-0.3 MPa.
4. The method for treating the total amount of landfill leachate of claim 3, wherein the landfill leachate filtered by the quartz sand filter is firstly filtered by a core filter with the filtering precision of 5um after being added with the scale inhibitor, and then is subjected to membrane separation treatment by a DTRO system.
5. The method of claim 3, wherein the obtained landfill leachate concentrate is filtered by a cartridge filter and then introduced into the DTCOD system.
6. The utility model provides a landfill leachate total processing system, includes the equalizing basin, its characterized in that, the equalizing basin passes through the elevator pump and connects pretreatment systems, pretreatment systems is used for carrying out the preliminary treatment to landfill leachate, and pretreatment systems switches on the DTRO system, the DTRO system includes the DTRO membrane module, the entrance point switch-on pretreatment systems of DTRO membrane module, the permeate liquid exit end of DTRO membrane module connects outer row mouth, the concentrate exit end switch-on DTCO system's of DTRO membrane module the end of intaking, the DTCO system includes dish tubular COD material separation membrane module, the permeate liquid exit end switch-on of DTCO system strengthens deamination system, and the concentrate exit end switch-on evaporation crystallization system of DTCO system, evaporation crystallization system includes MVR evaporation system and drying system, MVR evaporation system's exit end switch-on drying system, drying system is used for carrying out drying process to the material that comes from MVR evaporation system, the outlet end of the intensified deamination system is communicated with a deep electrolytic oxidation system, and the outlet end of the deep electrolytic oxidation system is communicated with an external discharge port.
7. The total landfill leachate treatment system of claim 6, wherein the outlet of the pretreatment system is connected to a quartz sand filter, the output of the quartz sand filter is connected to a cartridge filter, and the output of the cartridge filter is connected to the DTRO membrane module.
8. The landfill leachate total volume treatment system of claim 7, wherein the condensed water outlet end of the MVR evaporation system or/and the drying system is connected with an enhanced deamination system.
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