CN111470663A - Full-quantitative emergency treatment method and system for small-scale landfill leachate - Google Patents
Full-quantitative emergency treatment method and system for small-scale landfill leachate Download PDFInfo
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Abstract
The invention relates to a full-quantitative emergency treatment method and a system for small-scale landfill leachate, wherein the method comprises the steps of sequentially passing the landfill leachate through a lime reaction tank, a pretreatment container reaction tank, an inclined tube sedimentation tank, a PCF filter and a security filter; the pretreated landfill leachate enters a high-pressure reverse osmosis system, then clear liquid passing through the high-pressure reverse osmosis system enters an ion exchange system to remove ammonia nitrogen, the clear liquid is discharged after reaching the standard, and concentrated liquid passing through the high-pressure reverse osmosis system enters the next step; the membrane concentrated solution generated by the first-stage decrement system enters a forward osmosis system, the membrane concentrated solution is further concentrated to obtain a super-concentrated solution, and clear solution reaches the standard and is discharged to obtain the super-concentrated solution which enters a solidification system; and mixing the hyperconcentration liquid with a curing agent, a pH adjusting material and cement through a forward osmosis system, and spraying the mixture back to a refuse landfill through a spraying machine. The problem of zero emission is not reached in landfill leachate treatment is solved, convenient operation, the complete quantitative treatment process of landfill leachate of handling thoroughly.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a full-quantitative emergency treatment method and system for small-scale landfill leachate.
Background
The leachate generated by the household garbage is high-concentration wastewater with complex components, and has the characteristics of high hardness, high salt content, high heavy metal content, high organic pollutant concentration, high ammonia nitrogen/total nitrogen content, poor biodegradability and the like. The discharge standard of the landfill leachate is very strict, the national environmental protection department releases an execution standard of 'pollutant control standard of domestic refuse landfill' (GB16889-2008) which implements new revision aiming at the treatment of the landfill leachate in 2008, and the requirement of the discharge standard cannot be met by adopting a single physicochemical or biochemical process.
The small-scale landfill leachate emergency treatment project has the characteristics of rapidness, emergency, short construction period, high efficiency, small occupied area, flexible operation and the like, the main treatment mode adopted is materialization and membrane filtration, and although the leachate treatment effect is high, the following problems still exist: (1) in most small-scale leachate emergency projects, only the concentrated solution is refilled to a landfill site, so that salt is accumulated in a leachate treatment system for a long time, and the subsequent treatment difficulty of leachate is seriously increased; (2) high-concentration membrane concentrated solution is generated in the membrane filtration treatment process, and the membrane concentrated solution has high treatment difficulty, high salinity and high treatment difficulty; (3) the membrane treatment equipment has the problems of pollution and blockage, short service life, low recovery rate, high investment and operation cost and the like. (4) The membrane concentrated solution can not realize full-scale treatment, and has the problems of secondary pollution, high treatment cost and the like. The concentrated solution incineration disposal not only needs a large amount of energy consumption, but also has extremely high investment cost and operation cost due to serious corrosion phenomenon of high-salt concentration equipment. The evaporation process (multiple-effect evaporation, immersion evaporation and the like) has the problems that a large amount of waste gas is discharged to pollute the environment, concentrated waste residues are more difficult to treat, the treatment is not thorough, and the operation cost is higher.
Therefore, in the garbage leachate treatment project, particularly aiming at the characteristics of rapidness and urgency of a small-scale emergency treatment project, the leachate treatment process with stable and reliable technology, economy, reasonableness and flexible operation is sought, the problem of full quantification of leachate is fundamentally solved, and zero discharge of concentrated solution is realized.
Disclosure of Invention
The invention aims to solve the technical problem of providing a full-quantitative emergency treatment method and a full-quantitative emergency treatment system for small-scale landfill leachate, aiming at the characteristics of rapidness and emergency of small-scale leachate emergency treatment projects, solving the problem that zero emission is not achieved in landfill leachate treatment, and providing a full-quantitative treatment process for the small-scale landfill leachate, which has the advantages of high working efficiency, economic cost, simple equipment, convenience in operation and thorough disposal, and is suitable for the small-scale leachate emergency treatment projects.
The present invention is achieved in such a way that,
a full-quantitative emergency treatment method for small-scale landfill leachate comprises the following steps:
step 1: pretreatment: the landfill leachate sequentially passes through a lime reaction tank, a pretreatment container reaction tank, an inclined tube sedimentation tank, a PCF filter and a security filter to remove suspended matters and large-particle pollutants in the landfill leachate, so as to achieve the condition of entering a DTRO membrane treatment system;
step 2: the first-level decrement system is used for treating landfill leachate: the pretreated landfill leachate enters a high-pressure reverse osmosis system to remove COD, ammonia nitrogen and total nitrogen pollutants, then clear liquid passing through the high-pressure reverse osmosis system enters an ion exchange system to remove the ammonia nitrogen, the clear liquid is discharged after reaching the standard, and concentrated liquid passing through the high-pressure reverse osmosis system enters the next step;
and step 3: a secondary decrement system: the membrane concentrated solution generated by the first-stage decrement system enters a forward osmosis system, the membrane concentrated solution is further concentrated to obtain a super-concentrated solution, and clear solution reaches the standard and is discharged to obtain the super-concentrated solution which enters a solidification system;
and 4, step 4: a curing system: and mixing the hyperconcentration liquid with the curing agent through the forward osmosis system, and spraying the mixture back to the refuse landfill through a spraying machine.
Further, step 1 specifically includes: the method comprises the steps of enabling garbage leachate to enter a lime reaction tank, carrying out sedimentation treatment on the garbage leachate and a lime solution in a lime dissolving tank, enabling the garbage leachate to enter a pretreatment container reaction tank through a lifting pump, adding a flocculating agent PFS and a coagulant aid PAM, enabling the concentration of the flocculating agent PFS in the garbage leachate to be 40-55 ppm, enabling the concentration of the coagulant aid PAM in the garbage leachate to be PAM25-35ppm, reacting for 1min, enabling the garbage leachate to automatically flow to an inclined tube sedimentation tank, carrying out sedimentation for 30-40min, enabling supernatant to enter a buffer water tank, adding hydrochloric acid into clear liquid in the buffer water tank to adjust the pH to 5-7, enabling the clear liquid to enter a PCF filter and a security filter through a PCF lifting pump, filtering, and enabling.
Further, high pressure reverse osmosis includes one-level DTRO system and second grade DTRO system, and pretreatment systems goes out water and gets into one-level DTRO membrane processing system through the booster pump, and the water is produced to the one-level and gets into second grade DTRO membrane processing system, and the water is produced to the second grade through the pipeline and carries to the degasser, gets into the resin jar through the resin elevator pump after the deodorization, and qualified product water is discharged outside after the ion exchange.
Further, in step 3, the forward osmosis system reduces the concentrated solution by 50% by means of 100-180kPa osmotic pressure difference between the two sides of the permselective membrane.
Further, in the step 4, the hyper-concentrated solution passing through the forward osmosis system and the curing agent are mixed according to the mass ratio of 1: 1.5-3.0 mixing; the weight ratio of the hyper-concentrated solution to the pH adjusting material is 1: 0.2-0.25 mixing; the weight ratio of the hyperconcentration to the cement is 1: 0.03 to 0.04.
Further, the pH adjusting material is concentrated sulfuric acid or concentrated sulfuric acid.
A full-scale emergency treatment system for small-scale landfill leachate, which comprises:
the pretreatment system comprises a lime reaction tank, a pretreatment container reaction tank, an inclined tube sedimentation tank, a PCF filter, a security filter and a reverse osmosis raw water tank in sequence according to the treatment order to remove suspended matters and large-particle pollutants in the landfill leachate, so as to achieve the condition of entering the DTRO membrane treatment system;
the primary decrement system is connected with the reverse osmosis raw water pool, comprises a high-pressure reverse osmosis system according to the treatment sequence, removes COD, ammonia nitrogen and total nitrogen pollutants, then the clear liquid passing through the high-pressure reverse osmosis system enters an ion exchange system to remove the ammonia nitrogen, is discharged after reaching the standard, and enters the next system through the concentrated liquid passing through the high-pressure reverse osmosis system;
a secondary decrement system: the membrane concentrated solution generated by the first-stage decrement system enters a forward osmosis system, the membrane concentrated solution is further concentrated to obtain a super-concentrated solution, and clear solution is discharged after reaching the standard to obtain the super-concentrated solution;
a curing system: and mixing the hyperconcentration liquid of the secondary decrement system with the curing agent, the pH regulating material and the cement of the curing system, and spraying the mixture back to the refuse landfill.
Furthermore, the pretreatment system also comprises a buffer pool arranged between the inclined tube sedimentation tank and the PCF filter, the buffer pool is connected with the hydrochloric acid storage tank, and the standby PCF filter connected with the PCF filter is connected with the security filter through a standby security filter; the lime reaction tank is connected with a slaked lime medicine dissolving tank, and the slaked lime medicine dissolving tank is connected with a lime bin.
Further, the high pressure reverse osmosis system of the first stage abatement system comprises: the system comprises a primary DTRO membrane treatment system, a secondary DTRO membrane treatment system and an HPRO water inlet tank, wherein the effluent of the primary DTRO membrane treatment system is respectively connected with the secondary DTRO membrane treatment system and the secondary DTRO membrane treatment system, secondary permeate liquid passing through the secondary DTRO membrane treatment system enters a degassing tower through a DTRO clear liquid tank and then enters an ion exchange system, and a return pipe is arranged between the secondary DTRO membrane treatment system and the primary DTRO membrane treatment system to carry out the return flow of secondary concentrated liquid; one path of the HPRO water inlet pool is connected with the DTRO clear liquid pool, and the other path of the HPRO water inlet pool enters the concentrated liquid pool through the single-stage HPRO and flows back to the reverse osmosis raw water pool through the single-stage HPRO.
Further, the secondary abatement system comprises: the device comprises a first-stage forward osmosis tank, a second-stage forward osmosis tank and a third-stage forward osmosis tank, wherein the outlet of the third-stage forward osmosis tank is connected with a super-concentrated liquid tank to discharge super-concentrated liquid; and the produced water of the three-stage forward osmosis tank enters the dilution drawing liquid tank, the effluent of the dilution drawing liquid tank is connected to the high-salt concentration system, clear water passing through the high-salt concentration system enters the clear water tank, and the concentrated liquid of the high-salt concentration system enters the heat exchanger for heat exchange, then enters the concentration drawing liquid tank and returns to the three-stage forward osmosis tank.
Compared with the prior art, the invention has the beneficial effects that:
the invention realizes the full-scale treatment of the landfill leachate through the pretreatment system, the two-stage decrement system and the concentrated solution curing system through the treatment processes. The pre-treated landfill leachate is subjected to two-stage decrement treatment, and the effluent quality reaches the first-stage A standard of pollutant discharge Standard of urban wastewater treatment plant (GB 18918-2002). The qualified water production of the leachate is increased to the maximum extent by two-stage decrement treatment, the production of the landfill leachate membrane concentrated solution is reduced, the total amount of the membrane concentrated solution entering a curing treatment system is reduced, the operation cost is reduced, and the full-scale treatment of the landfill leachate is realized in a real sense.
The membrane concentrated solution is reduced by adopting a forward osmosis system, so that the treatment cost of the membrane concentrated solution is reduced. The curing covering technology can realize remote spraying operation, the operation mode is flexible and convenient, a large amount of equipment burning and labor cost is saved, under the action of the curing base material and the special curing agent, pollutants hardly seep out along with rain wash or soaking after the covering material is dried into a shell, the waterproof hard film can block the escape volatilization and sterilization effects of odor gas, and the odor gas removal rate can reach more than 98%. Compared with incineration and evaporation processes, the method has the technical advantages of low investment cost, thorough disposal and the like. The full-scale emergency treatment process has the advantages of short treatment time, good effect, low cost, convenience in equipment installation and flexibility in operation, and is suitable for small-scale emergency treatment projects.
Drawings
FIG. 1 is a flow chart of a method provided by an embodiment of the present invention;
FIG. 2 is a block diagram of a preprocessing system provided by an embodiment of the present invention;
FIG. 3 is a block diagram of a one-level decrement system provided by an embodiment of the present invention;
FIG. 4 is a block diagram of a two-level decrement system provided by an embodiment of the present invention;
fig. 5 is a block diagram of a curing system provided by an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following 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.
Referring to fig. 1, a full-scale emergency treatment method for small-scale landfill leachate includes the following steps:
step 1: pretreatment: the landfill leachate sequentially passes through a lime reaction tank, a pretreatment container reaction tank, an inclined tube sedimentation tank, a PCF filter and a security filter to remove suspended matters and large-particle pollutants in the landfill leachate, so as to achieve the condition of entering a DTRO membrane treatment system;
step 2: the first-level decrement system is used for treating landfill leachate: the pretreated landfill leachate enters a high-pressure reverse osmosis system to remove COD, ammonia nitrogen and total nitrogen pollutants, then clear liquid passing through the high-pressure reverse osmosis system enters an ion exchange system to remove the ammonia nitrogen, the clear liquid is discharged after reaching the standard, and concentrated liquid passing through the high-pressure reverse osmosis system enters the next step;
and step 3: a secondary decrement system: the membrane concentrated solution generated by the first-stage decrement system enters a forward osmosis system, the membrane concentrated solution is further concentrated to obtain a super-concentrated solution, and clear solution reaches the standard and is discharged to obtain the super-concentrated solution which enters a solidification system;
and 4, step 4: a curing system: and mixing the hyperconcentration liquid with the curing agent through the forward osmosis system, and spraying the mixture back to the refuse landfill through a spraying machine.
The step 1 specifically comprises the following steps: the method comprises the steps of enabling garbage leachate to enter a lime reaction tank, carrying out sedimentation treatment on the garbage leachate and a lime solution in a lime dissolving tank, enabling the garbage leachate to enter a pretreatment container reaction tank through a lifting pump, adding a flocculating agent PFS and a coagulant aid PAM, enabling the concentration of the flocculating agent PFS in the garbage leachate to be 40-55 ppm, enabling the concentration of the coagulant aid PAM in the garbage leachate to be PAM25-35ppm, reacting for 1min, enabling the garbage leachate to automatically flow to an inclined tube sedimentation tank, carrying out sedimentation for 30-40min, enabling supernatant to enter a buffer water tank, adding hydrochloric acid into clear liquid in the buffer water tank to adjust the pH to 5-7, enabling the clear liquid to enter a PCF filter and a security filter through a PCF lifting pump, filtering, and enabling.
High pressure reverse osmosis includes one-level DTRO membrane processing system and second grade DTRO membrane processing system, and pretreatment systems goes out water and gets into one-level DTRO membrane processing system through the booster pump, and the water gets into second grade DTRO membrane processing system is produced to the one-level, and the water is produced to the second grade through the pipeline and is carried to the degasser, gets into the resin jar through the resin elevator pump after the deodorization, and the qualified product water is arranged outside after ion exchange through ion exchange system in the resin jar. The quality of the produced water reaches the first grade A standard of pollutant discharge Standard of urban wastewater treatment plant (GB 18918-2002).
In the step 2, the forward osmosis system reduces the concentrated solution by 50% by depending on 100-180kPa of the osmotic pressure difference at the two sides of the selective osmosis membrane. And the concentrated solution is subjected to decrement treatment by adopting a forward osmosis process so as to reduce the total amount of the concentrated solution entering the tail end treatment and reduce the treatment cost. The forward osmosis process realizes the transmission of water in the membrane spontaneously by taking the osmotic pressure difference at two sides of the permselective membrane as a driving force, has the characteristics of low-pressure or non-pressure operation, low energy consumption, low membrane pollution and the like, realizes the reduction of 50 percent of membrane concentrated solution, and reduces the treatment cost of the membrane concentrated solution.
Further, the hyper-concentrated solution and the curing agent which pass through a forward osmosis system are mixed according to the mass ratio of 1: 1.5-3.0, fully stirring and mixing the hyperconcentration solution which passes through a forward osmosis system with materials such as a stabilizer, a curing agent and the like, spraying the mixture to the surface of the garbage pile body, and drying the sprayed slurry-like mixture to form a stable covering layer on the surface of the garbage pile body. The precipitation and the reverse dissolution of various cured pollutants are prevented under the action of various curing agents, and organic pollutants, ammonia nitrogen and salt do not enter a garbage pile body any more. The hyper-concentrated solution passing through the forward osmosis system and a pH adjusting material are mixed according to the mass ratio of 1: 0.2-0.25 mixing; the weight ratio of the hyperconcentration to the cement is 1: 0.03 to 0.04. The pH adjusting material is concentrated sulfuric acid or concentrated sulfuric acid. The selection of the curing agent is not limited, and for example, an epoxy resin curing agent may be selected. The cement can be selected from portland cement.
The invention provides a small-scale landfill leachate full-quantification emergency treatment system for realizing the method, which comprises the following steps:
referring to fig. 1 and fig. 2, the pretreatment system sequentially comprises a lime reaction tank, a pretreatment container reaction tank, an inclined tube sedimentation tank, a PCF filter, a cartridge filter and a reverse osmosis raw water tank according to the treatment sequence to remove suspended matters and large-particle pollutants in landfill leachate, so as to achieve the condition of entering a DTRO membrane treatment system;
the primary decrement system is connected with the reverse osmosis raw water pool, comprises a high-pressure reverse osmosis system according to the treatment sequence, removes COD, ammonia nitrogen and total nitrogen pollutants, then the clear liquid passing through the high-pressure reverse osmosis system enters an ion exchange system to remove the ammonia nitrogen, is discharged after reaching the standard, and enters the next system through the concentrated liquid passing through the high-pressure reverse osmosis system;
a secondary decrement system: the membrane concentrated solution generated by the first-stage decrement system enters a forward osmosis system, the membrane concentrated solution is further concentrated to obtain a super-concentrated solution, and clear solution is discharged after reaching the standard to obtain the super-concentrated solution;
a curing system: and mixing the hyperconcentration liquid of the secondary decrement system with the curing agent, the pH regulating material and the cement of the curing system, and spraying the mixture back to the refuse landfill.
The pretreatment system also comprises a buffer water tank arranged between the inclined tube sedimentation tank and the PCF filter, and the buffer water tank is connected with the hydrochloric acid storage tank. The pre-processing system also includes a backup PCF filter coupled to the PCF filter, the backup PCF filter coupled to the canister filter through a backup canister filter.
The lime reaction tank is connected with a slaked lime medicine dissolving tank, and the slaked lime medicine dissolving tank is connected with a lime bin.
Referring to fig. 3, the high pressure reverse osmosis system of the first stage abatement system comprises: one-level DTRO membrane processing system, second grade DTRO membrane processing system and HPRO intake pool, second grade DTRO membrane processing system and second grade DTRO membrane processing system are connected respectively to one-level DTRO membrane processing system play water, and the second grade permeate liquid through second grade DTRO membrane processing system gets into the degasser after passing through DTRO clear solution pond, gets into the ion exchange system, has the back flow between second grade DTRO membrane processing system and the one-level DTRO membrane processing system and carries out the backward flow of second grade concentrate.
One path of the HPRO water inlet pool is connected with the DTRO clear liquid pool, and the other path of the HPRO water inlet pool enters the concentrated liquid pool through the single-stage HPRO and flows back to the reverse osmosis raw water pool through the single-stage HPRO.
Referring to FIG. 4, a two-stage abatement system includes: the device comprises a first-stage forward osmosis tank, a second-stage forward osmosis tank and a third-stage forward osmosis tank, wherein the outlet of the third-stage forward osmosis tank is connected with a super-concentrated liquid tank to discharge super-concentrated liquid; and the produced water of the three-stage forward osmosis tank enters the dilution drawing liquid tank, the effluent of the dilution drawing liquid tank is connected to the high-salt concentration system, clear water passing through the high-salt concentration system enters the clear water tank, and the concentrated liquid of the high-salt concentration system enters the heat exchanger for heat exchange, then enters the concentration drawing liquid tank and returns to the three-stage forward osmosis tank.
Referring to fig. 5, the curing system includes a mixing and stirring system to stir the curing material and a spray coating device to add deodorant for back-spraying to the landfill.
The full-scale treatment of the percolate is realized through the processes of pretreatment, two-stage decrement treatment, solidification treatment and the like, the combined process has good treatment effect, and the produced water reaches the first-level A standard of pollutant discharge standard of urban sewage treatment plants (GB 18918-2002). The membrane concentrated solution is reduced by adopting a forward osmosis system, so that the treatment cost of the membrane concentrated solution is reduced. The curing covering technology can realize remote spraying operation, the operation mode is flexible and convenient, a large amount of equipment burning and labor cost is saved, under the action of the curing base material and the special curing agent, pollutants hardly seep out along with rain wash or soaking after the covering material is dried into a shell, the waterproof hard film can block the escape volatilization and sterilization effects of odor gas, and the odor gas removal rate can reach more than 98%. Compared with incineration and evaporation processes, the method has the technical advantages of low investment cost, thorough disposal and the like. The full-scale emergency treatment process has the advantages of short treatment time, good effect, low cost, convenience in equipment installation and flexibility in operation, and is suitable for small-scale emergency treatment projects.
Item for emergency treatment of landfill leachate in certain landfill
The daily treatment scale of a certain landfill leachate emergency treatment project is 800 tons, and the treated water quality is shown in Table 1.
The garbage leachate is pretreated, lime solution and the leachate are subjected to sedimentation treatment firstly, then the garbage leachate enters a pretreatment container reaction tank through a lift pump, a flocculating agent PFS and a coagulant aid PAM are added, the garbage leachate automatically flows to an inclined tube sedimentation tank after reaction, supernatant enters a buffer water tank after sedimentation separation, hydrochloric acid is added into the clear liquid in the buffer water tank to adjust the pH value, the clear liquid enters a PCF filter and a security filter through the PCF lift pump, and the clear liquid enters a high-pressure reverse osmosis system through a booster pump after filtration. And (3) after reverse osmosis treatment, the produced water enters a resin tank through a resin lifting pump, and after passing through ion exchange resin, the qualified produced water is discharged outside, and the produced water reaches the first-class A standard of pollutant discharge Standard of municipal wastewater treatment plant (GB 18918-2002).
And (3) carrying out decrement treatment on the concentrated solution generated in the membrane treatment process through a forward osmosis system, discharging the clear solution after the clear solution reaches the standard, mixing the super concentrated solution and the curing agent, and spraying the mixture back to the refuse landfill through a spraying machine.
The leachate adopts a treatment process of pretreatment, high-pressure reverse osmosis, ion exchange, concentrated solution forward osmosis decrement and hyperconcentration solidification back spraying, and the produced water reaches the first-class A standard of pollutant discharge standard of urban sewage treatment plants (GB 18918-2002). The process has high treatment efficiency and flexible operation, and realizes full-scale treatment of the percolate.
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 (10)
1. A full-quantitative emergency treatment method for small-scale landfill leachate is characterized by comprising the following steps:
step 1: pretreatment: the landfill leachate sequentially passes through a lime reaction tank, a pretreatment container reaction tank, an inclined tube sedimentation tank, a PCF filter and a security filter to remove suspended matters and large-particle pollutants in the landfill leachate, so as to achieve the condition of entering a DTRO membrane treatment system;
step 2: the first-level decrement system is used for treating landfill leachate: the pretreated landfill leachate enters a high-pressure reverse osmosis system to remove COD, ammonia nitrogen and total nitrogen pollutants, then clear liquid passing through the high-pressure reverse osmosis system enters an ion exchange system to remove the ammonia nitrogen, the clear liquid is discharged after reaching the standard, and concentrated liquid passing through the high-pressure reverse osmosis system enters the next step;
and step 3: a secondary decrement system: the membrane concentrated solution generated by the first-stage decrement system enters a forward osmosis system, the membrane concentrated solution is further concentrated to obtain a super-concentrated solution, and clear solution reaches the standard and is discharged to obtain the super-concentrated solution which enters a solidification system;
and 4, step 4: a curing system: and mixing the hyperconcentration liquid with a curing agent, a pH adjusting material and cement through a forward osmosis system, and spraying the mixture back to a refuse landfill through a spraying machine.
2. The method according to claim 1, characterized in that step 1 comprises in particular: the method comprises the steps of enabling garbage leachate to enter a lime reaction tank, carrying out sedimentation treatment on the garbage leachate and a lime solution in a lime dissolving tank, enabling the garbage leachate to enter a pretreatment container reaction tank through a lifting pump, adding a flocculating agent PFS and a coagulant aid PAM, enabling the concentration of the flocculating agent PFS in the garbage leachate to be 40-55 ppm, enabling the concentration of the coagulant aid PAM in the garbage leachate to be PAM25-35ppm, reacting for 1min, enabling the garbage leachate to automatically flow to an inclined tube sedimentation tank, carrying out sedimentation for 30-40min, enabling supernatant to enter a buffer water tank, adding hydrochloric acid into clear liquid in the buffer water tank to adjust the pH to 5-7, enabling the clear liquid to enter a PCF filter and a security filter through a PCF lifting pump, filtering, and enabling.
3. The method as claimed in claim 1, wherein the high pressure reverse osmosis comprises a primary DTRO membrane treatment system and a secondary DTRO membrane treatment system, effluent from the pretreatment system enters the primary DTRO membrane treatment system through a booster pump, primary produced water enters the secondary DTRO membrane treatment system, secondary produced water is conveyed to a degassing tower through a pipeline, deodorized and then enters a resin tank through a resin lift pump, and qualified produced water is discharged after ion exchange.
4. The method as set forth in claim 1, wherein in step 3, the forward osmosis system reduces the concentrate by 50% by means of 100-180kPa of the osmotic pressure difference across the permselective membrane.
5. The method of claim 1, wherein in step 4, the weight ratio of the hyper-concentrate to the curing agent passing through the forward osmosis system is 1: 1.5-3.0 mixing; the weight ratio of the hyper-concentrated solution to the pH adjusting material is 1: 0.2-0.25 mixing; the weight ratio of the hyperconcentration to the cement is 1: 0.03 to 0.04.
6. The method of claim 5, wherein the pH adjusting material is concentrated sulfuric acid or concentrated sulfuric acid.
7. A small-scale landfill leachate full-quantification emergency treatment system is characterized by comprising:
the pretreatment system comprises a lime reaction tank, a pretreatment container reaction tank, an inclined tube sedimentation tank, a PCF filter, a security filter and a reverse osmosis raw water tank in sequence according to the treatment order to remove suspended matters and large-particle pollutants in the landfill leachate, so as to achieve the condition of entering the DTRO membrane treatment system;
the primary decrement system is connected with the reverse osmosis raw water pool, comprises a high-pressure reverse osmosis system according to the treatment sequence, removes COD, ammonia nitrogen and total nitrogen pollutants, then the clear liquid passing through the high-pressure reverse osmosis system enters an ion exchange system to remove the ammonia nitrogen, is discharged after reaching the standard, and enters the next system through the concentrated liquid passing through the high-pressure reverse osmosis system;
a secondary decrement system: the membrane concentrated solution generated by the first-stage decrement system enters a forward osmosis system, the membrane concentrated solution is further concentrated to obtain a super-concentrated solution, and clear solution is discharged after reaching the standard to obtain the super-concentrated solution;
a curing system: and mixing the hyperconcentration liquid of the secondary decrement system with the curing agent, the pH regulating material and the cement of the curing system, and spraying the mixture back to the refuse landfill.
8. The system of claim 7,
the pretreatment system also comprises a buffer pool arranged between the inclined tube sedimentation tank and the PCF filter, the buffer pool is connected with the hydrochloric acid storage tank, and the buffer pool also comprises a standby PCF filter connected with the PCF filter, and the standby PCF filter is connected with the security filter through a standby security filter; the lime reaction tank is connected with a slaked lime medicine dissolving tank, and the slaked lime medicine dissolving tank is connected with a lime bin.
9. The system of claim 7,
the high pressure reverse osmosis system of the first reduction system comprises: the system comprises a primary DTRO membrane treatment system, a secondary DTRO membrane treatment system and an HPRO water inlet tank, wherein the effluent of the primary DTRO membrane treatment system is respectively connected with the secondary DTRO membrane treatment system and the secondary DTRO membrane treatment system, secondary permeate liquid passing through the secondary DTRO membrane treatment system enters a degassing tower through a DTRO clear liquid tank and then enters an ion exchange system, and a return pipe is arranged between the secondary DTRO membrane treatment system and the primary DTRO membrane treatment system to carry out the return flow of secondary concentrated liquid; one path of the HPRO water inlet pool is connected with the DTRO clear liquid pool, and the other path of the HPRO water inlet pool enters the concentrated liquid pool through the single-stage HPRO and flows back to the reverse osmosis raw water pool through the single-stage HPRO.
10. The system of claim 7, wherein the secondary abatement system comprises: the device comprises a first-stage forward osmosis tank, a second-stage forward osmosis tank and a third-stage forward osmosis tank, wherein the outlet of the third-stage forward osmosis tank is connected with a super-concentrated liquid tank to discharge super-concentrated liquid; and the produced water of the three-stage forward osmosis tank enters the dilution drawing liquid tank, the effluent of the dilution drawing liquid tank is connected to the high-salt concentration system, clear water passing through the high-salt concentration system enters the clear water tank, and the concentrated liquid of the high-salt concentration system enters the heat exchanger for heat exchange, then enters the concentration drawing liquid tank and returns to the three-stage forward osmosis tank.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112645498A (en) * | 2020-12-31 | 2021-04-13 | 维尔利环保科技集团股份有限公司 | Treatment method of reverse osmosis concentrated solution of high-magnesium landfill leachate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108046505A (en) * | 2018-01-05 | 2018-05-18 | 浙江仁欣环科院有限责任公司 | Advanced treating method of landfill leachate |
| CN109734236A (en) * | 2019-03-05 | 2019-05-10 | 上海缘脉环境科技有限公司 | A kind of positive osmosis concentration technique of landfill leachate |
| CN209210569U (en) * | 2018-12-10 | 2019-08-06 | 北京合众清源环境科技有限公司 | The zero-discharge treatment system of landfill leachate |
| CN110550701A (en) * | 2019-09-09 | 2019-12-10 | 中国电建集团华东勘测设计研究院有限公司 | Zero-emission concentration system for reverse osmosis process by using forward osmosis membrane module |
| CN110655273A (en) * | 2019-09-20 | 2020-01-07 | 武汉天源环保股份有限公司 | Old refuse landfill leachate treatment system and method |
-
2020
- 2020-04-24 CN CN202010330081.7A patent/CN111470663A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108046505A (en) * | 2018-01-05 | 2018-05-18 | 浙江仁欣环科院有限责任公司 | Advanced treating method of landfill leachate |
| CN209210569U (en) * | 2018-12-10 | 2019-08-06 | 北京合众清源环境科技有限公司 | The zero-discharge treatment system of landfill leachate |
| CN109734236A (en) * | 2019-03-05 | 2019-05-10 | 上海缘脉环境科技有限公司 | A kind of positive osmosis concentration technique of landfill leachate |
| CN110550701A (en) * | 2019-09-09 | 2019-12-10 | 中国电建集团华东勘测设计研究院有限公司 | Zero-emission concentration system for reverse osmosis process by using forward osmosis membrane module |
| CN110655273A (en) * | 2019-09-20 | 2020-01-07 | 武汉天源环保股份有限公司 | Old refuse landfill leachate treatment system and method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112645498A (en) * | 2020-12-31 | 2021-04-13 | 维尔利环保科技集团股份有限公司 | Treatment method of reverse osmosis concentrated solution of high-magnesium landfill leachate |
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