Landfill leachate decrement full-membrane treatment device
By combining biofilm, fractional membrane modules, and energy recovery technology with a full-membrane treatment device, the problems of stability and efficiency in landfill leachate treatment have been solved, achieving high recovery rate and environmental protection and energy saving effects.
Patent Information
- Application Number
- CN202422952862.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Existing technologies for treating landfill leachate suffer from problems such as unstable treatment effects, insufficient methanogenic activity, low removal rate in the biological treatment stage, sludge loss, high operating costs, short membrane lifespan, and frequent fouling, resulting in unstable effluent quality and making it difficult to achieve long-term reliable operation of the leachate system.
The system employs a full membrane treatment device, including a biofilm, a fractional membrane module, a softening membrane, and a reduced-volume DTRO membrane treatment device. Combining anaerobic and aerobic membrane technologies, it separates salts by separating ion valence differences and incorporates an energy and heat recovery system to achieve stable treatment and high recovery rates.
It achieves efficient and stable treatment of landfill leachate, with a water recovery rate of over 80%, saving energy and land area, reducing membrane scaling and clogging, and achieving environmental protection and energy-saving effects.
Smart Images
Figure CN223705356U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of sewage treatment device, especially, relate to a garbage leachate reduction full membrane treatment device. BACKGROUND
[0002] Garbage leachate refers to the moisture contained in garbage itself, rain and snow water and other moisture entering the landfill, excluding the saturated water holding capacity of garbage and soil cover, and a kind of high concentration organic wastewater formed after experiencing garbage layer and soil cover.City garbage landfill / incineration plant leachate is a kind of high concentration organic wastewater with complex composition, which will cause serious environmental pollution if not treated and directly discharged into the environment.Garbage leachate contains extremely high concentration of BOD, COD, nitrogen-containing compounds, phosphorus-containing compounds, organic halides and sulfides, inorganic salts and other substances, not only has foul odor, but also many of them are carcinogens.It has the characteristics of high pollutant concentration, high content of organic pollutants, complex composition, serious imbalance of microbial nutrient elements in leachate, large water quality variation and high heavy metal content.
[0003] For the purpose of protecting the environment, it is necessary to treat leachate, and it is difficult to reach the standard discharge for garbage leachate due to its complex cost.The difficulty of treating garbage leachate lies not only in its high concentration of organic pollutants, but also in its complex composition of pollutants.According to the characteristics of domestic garbage, there are tens of thousands of organic species in garbage leachate, including a large amount of refractory substances with varying characteristics.Compared with single industrial wastewater treatment, biochemical treatment of leachate requires a large number of microbial species in the reactor and a very low sludge load.The existing technology often has the problems of unstable treatment effect, insufficient methanogenic activity, low removal rate in biochemical section, sludge loss, high operation cost, abnormal activated sludge affecting treatment effect, frequent fouling, short service life of membrane and other problems, resulting in unstable effluent effect and difficulty in maintaining long-term reliable operation of leachate system. Utility model content
[0004] Therefore, it is necessary to provide a garbage leachate reduction full membrane treatment device.
[0005] The utility model discloses a technical scheme that solves its technical problem is: a kind of garbage leachate reduction full membrane processing device, including biological membrane processing device, fraction membrane group processing device, softening membrane processing device, reduction DTRO membrane processing device and circulating heat exchanger, biological membrane processing device has two pipelines to fraction membrane group reaction tank, one pipeline is installed with circulating heat exchanger, fraction membrane group processing device has three pipelines respectively to softening membrane processing device, reduction DTRO membrane processing device and qualified water pool, softening membrane processing device and reduction DTRO membrane processing device are interconnected, while, softening membrane processing device has one pipeline and is connected to qualified water pool, reduction DTRO membrane processing device is connected to sludge pool by one pipeline.
[0006] Further, the reduction DTRO membrane processing device includes a reduction DTRO membrane reaction tank and a reuse water pipeline connecting the reduction DTRO membrane reaction tank and the qualified water pool.
[0007] Further, the softening membrane processing device includes a softening membrane reaction tank, a blowdown pipe and a transmission pipeline, the blowdown pipe connects the softening membrane reaction tank and the sludge pool, and the transmission pipeline connects the softening membrane reaction tank and the reduction DTRO membrane reaction tank.
[0008] Further, the fraction membrane group processing device includes a fraction membrane reaction tank, a monovalent salt water pipeline and a divalent salt water pipeline, the monovalent salt water pipeline connects the fraction membrane reaction tank and the reduction DTRO membrane reaction tank, and the divalent salt water pipeline connects the fraction membrane reaction tank and the softening membrane reaction tank.
[0009] Further, the biological membrane processing device includes an anaerobic membrane group, an aerobic membrane group and a biological membrane transmission pipeline, the anaerobic membrane group includes an anaerobic reactor and a curtain type microporous membrane group, the aerobic membrane group includes a biological membrane and an MBR membrane, the biological membrane is located on the upper layer of the MBR membrane, the anaerobic membrane group is located on the upper layer of the aerobic membrane group, and the biological membrane transmission pipeline transports the leachate filtered through the MBR membrane to the fraction membrane reaction tank.
[0010] The utility model has the advantages that:
[0011] (1) The "full membrane" technology is applied to the garbage leachate process by using anaerobic biological membrane, aerobic biological membrane, softening membrane, disc desalination membrane and other biochemical and physical membrane technologies, so that the technology is advanced, the treatment is stable, the recovery rate is high, and the comprehensive reuse water rate of the full membrane process section is more than 80%;
[0012] (2) The fraction membrane combination technology separates salt according to the ion valence difference, avoids membrane fouling, reduces the treatment capacity burden of the softening system, and creates conditions for crystalline salt separation. And through the application of series connection technology, the water collecting and pressurizing device required by the reverse osmosis membrane unit is saved;
[0013] (3) Energy recovery: The fractional membrane module treatment device and the reduced DTRO membrane treatment device are equipped with energy recovery, which recovers the high pressure energy on the concentrate side to the inlet end, greatly reducing the feed energy, saving a lot of energy consumption, and not causing energy waste;
[0014] (4) Heat source recovery: When the membrane system needs to maintain a certain temperature, the heat release of the medium anaerobic process is used to circulate the heat source to achieve the heating temperature required for the membrane feed water, without the need for an external heat source.
[0015] (5) The application of process technology has environmental protection functions such as saving materials, saving land, saving energy, and realizing the resource utilization of all phases, which is green and environmentally friendly. Attached Figure Description
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0017] Figure 1 This is a structural layout diagram of a landfill leachate reduction and full-membrane treatment device according to the present invention.
[0018] The component names and their numbers in the diagram are as follows:
[0019] 1. Biofilm treatment device; 2. Differentiated membrane module treatment device; 21. Monovalent brine pipeline; 22. Divalent brine pipeline; 3. Softening membrane treatment device; 4. Reduced-volume DTRO membrane treatment device; 5. Circulating heat exchanger. Detailed Implementation
[0020] The present invention will now be described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0021] like Figure 1 As shown, this utility model provides a landfill leachate reduction and full membrane treatment device, which includes a biofilm treatment device 1, a fractional membrane group treatment device 2, a softening membrane treatment device 3, a reduction DTRO membrane treatment device 4, and a circulating heat exchanger 5.
[0022] The biofilm treatment device 1 includes a biofilm reactor, which has two pipes leading to the fractional membrane treatment device 2. One of the pipes is equipped with a circulating heat exchanger 5. The fractional membrane treatment device 2 includes a fractional membrane reactor, which has three pipes leading to a softening membrane treatment device 3, a reduced-volume DTRO membrane treatment device 4, and a qualified permeate tank, respectively. The softening membrane treatment device 3 includes a softening membrane reactor, and the reduced-volume DTRO membrane treatment device includes a reduced-volume DTRO membrane reactor. The softening membrane reactor and the reduced-volume DTRO membrane reactor are connected to each other by a pipe. At the same time, the softening membrane reactor is connected to the sludge tank by a pipe, and the reduced-volume DTRO membrane reactor is connected to the qualified permeate tank by a pipe.
[0023] The landfill leachate enters the system and is first treated by the biological membrane treatment device 1 to remove high concentrations of COD, NH3-N and other indicators. This process includes two membrane technologies. One is anaerobic membrane technology, which combines an anaerobic reactor and a curtain-type microporous membrane group. After anaerobic membrane treatment, the wastewater enters the aerobic membrane system. The aerobic part includes biological membranes and MBR membranes. The biological membrane pool is equipped with fillers to provide carriers for the biological membranes. The use of biological membranes greatly improves the treatment load and avoids sludge bulking problems. At the same time, by setting the oxygenation amount, the goal of denitrification and phosphorus removal is achieved. The MBR membrane creates conditions for subsequent salt removal, eliminating the need for a secondary sedimentation tank.
[0024] After biological membrane treatment, to further remove small-molecule organic matter and reduce the complex salt content in the wastewater, the wastewater is treated by the fractionated membrane group treatment device 2. The fractionated membrane group fully considers the characteristics of the leachate components, distinguishes between divalent ions Ca 2+ , Mg 2+ and monovalent ions Na + , K + and other components, removes them based on their quality and price, maintains the stable operation of the membrane, avoids membrane fouling, and reduces the load on the softening system, creating conditions for crystallization and salt separation. The fractionated membrane uses nanofiltration and reverse osmosis as a combined process, with a conventional two-unit layout. This process integrates nanofiltration and reverse osmosis into one unit, eliminating the need for intermediate collection and lifting work. Nanofiltration water is directly connected to the reverse osmosis high-pressure section, achieving simultaneous fractionated desalination. The nanofiltration water uses the residual pressure to achieve reverse osmosis pressure boosting.
[0025] The fractionated membrane group treatment device 2 produces two groups of concentrated water. One group is mainly divalent salt concentrated water, and the other group is monovalent salt concentrated water. To improve the recovery rate of the recycled water, the concentrated water needs to be further concentrated. To reduce the risk of fouling and calcium and magnesium salt scaling in the later concentration membrane, the divalent salt concentrated water needs to be softened to remove the calcium and magnesium hardness. The softening process uses the softening membrane treatment device 3, which is a device-based form. Compared with the clarifier and sedimentation tank body process, it has the advantages of good removal effect and land saving.
[0026] The concentrated water after softening of the divalent salt is combined with the monovalent salt concentrated water and enters the DTRO membrane treatment device 4 for further concentration. It can also be separately treated according to the requirements of the crystallization system.
[0027] The process sections are connected to form a landfill leachate treatment main body, which effectively converts wastewater into recyclable resources, and achieves the goals of advanced process, stable effect, high water recovery rate, and green energy saving. The whole process of solid-liquid-gas phase is realized as resource utilization. The liquid phase wastewater is treated by membrane to meet the "Urban Wastewater Reuse Industrial Water Quality" (GB / T 19923-2005), realizing high-quality reuse. The solid phase sludge can be used for incineration power generation, and the crystalline salt can be used as an industrial raw material. The gas phase biogas is used for power generation or boiler heating, which has great significance for environmental protection.
[0028] The biological membrane treatment device 1 includes an anaerobic membrane group, an aerobic membrane group, and a biological membrane treatment device transmission pipeline. The anaerobic membrane group includes an anaerobic reactor and a curtain type microporous membrane group. The aerobic membrane group includes a biological membrane and an MBR membrane. After the leachate enters the system through the water inlet pipeline, the high-concentration COD, NH3-N, and other indicators are removed by the biological membrane reactor. This process includes two membrane technologies. One is anaerobic membrane technology, which combines the anaerobic reactor and the curtain type microporous membrane group to degrade the pollutant indicators. The application of this membrane method can avoid sludge loss, maintain the stability and activity of the granular sludge required for anaerobic reaction, and improve the biogas production, thereby achieving efficient treatment. The biogas produced by this process can be reused for power generation or used as a heat source for heating. After anaerobic membrane treatment, the wastewater enters the aerobic membrane group, which includes a biological membrane and an MBR membrane. The biological membrane provides a carrier for the biological membrane by being installed in the biological membrane tank. The application of the biological membrane greatly improves the treatment load and avoids sludge bulking. At the same time, the setting of the oxygenation amount achieves the goal of denitrification and phosphorus removal. The MBR membrane creates conditions for subsequent desalination, eliminating the need for a secondary sedimentation tank. The effluent meets the desalination membrane standard after being filtered by the MBR membrane. The application of the aerobic membrane group improves the stability of the biochemical system and saves land area, contributing to land saving.
[0029] After being treated by the biological membrane treatment device 1, the leachate is treated by the fractional membrane group treatment device 2 through the biological membrane treatment device transmission pipeline to further remove small-molecule organic matter and reduce the complex salt content in the wastewater. The fractional membrane group system 2 includes a fractional membrane reaction tank, a monovalent salt water pipeline, and a divalent salt water pipeline. The fractional membrane group treatment device 2 fully considers the characteristics of the leachate components, and separates the divalent ions Ca 2+ , Mg 2+ and the monovalent ions Na + , K +The components such as salt are removed in quality and price, the stable operation of the membrane is maintained, the membrane fouling phenomenon is avoided, the load of the softening system treatment capacity is reduced, and the conditions for the crystallization and salt separation target are created. The price separation membrane adopts nanofiltration and reverse osmosis as a combined process, and distinguishes the two conventional unit layouts. The price separation membrane group treatment device 2 combines nanofiltration and reverse osmosis into one unit, eliminates the intermediate collection and lifting work, directly connects the nanofiltration water to the reverse osmosis high-pressure section, realizes the synchronous price separation desalination effect, uses the nanofiltration water residual pressure to achieve the reverse osmosis pressure boosting effect. At the same time, the percolate treatment reverse osmosis high-pressure pump pressure is relatively high, about 4 MPa, the concentrated water section pressure is high, and is often discharged with the concentrated water, which causes a large energy waste. The price separation membrane group treatment device 2 recovers and supplements the concentrated water side pressure to the high-pressure pump, which can reduce the high-pressure pump selection and save more than 30% of the power consumption.
[0030] The circulating heat exchanger 5 is installed on the heat exchange pipeline, wherein the two ends of the heat exchange pipeline are connected with the biological membrane reaction tank and the price separation membrane reaction tank. After the mesophilic anaerobic treatment, a large amount of heat energy is discharged into the aerobic membrane group, and the optimal temperature of the subsequent membrane system is about 25°C. Therefore, when the water temperature of the membrane system is low, the heat energy of the anaerobic section is recycled and used to heat the low-temperature water through the circulating heat exchanger, realizing the recycling function and improving the stable operation effect, and avoiding energy waste.
[0031] The price separation membrane group treatment device 2 generates two groups of concentrated water, one group is mainly divalent salt concentrated water, which is transmitted to the softening membrane reaction tank through the divalent salt water pipeline, and the other group is monovalent salt concentrated water, which is transmitted to the reduced DTRO membrane reaction tank through the monovalent salt water pipeline. The softening membrane treatment device 3 includes a softening membrane reaction tank, a blowdown pipe and a transmission pipeline. In order to improve the recovery rate of the recycled water, the concentrated water needs to be further concentrated. In order to reduce the risk of fouling and calcium and magnesium salt fouling of the subsequent concentration membrane, the divalent salt concentrated water needs to be softened to remove the calcium and magnesium hardness. The softening process adopts the softening membrane technology, which has the advantages of good removal effect and land saving compared with the clarification and sedimentation tank body process. The remaining sludge flows to the sludge tank through the blowdown pipe.
[0032] The concentrated water softened by the divalent salt is combined with the concentrated water of monovalent salt through the transmission pipeline and enters the DTRO membrane treatment device 4 for further concentration. According to the requirements of the salt separation of the crystallization system, the DTRO membrane can also be separately treated. The DTRO membrane adopts a disc type membrane, and the flow channel is large, which can cope with the high COD of the concentrated water. The softening process in the front stage avoids the risk of membrane fouling, and the operation is stable and reliable. The further concentration of the DTRO membrane reaction tank can greatly improve the water recovery rate of the wastewater reuse, and the overall water recovery rate reaches more than 80% of the reuse index. In the treatment and reuse of high-concentration wastewater, it belongs to the high-recovery-rate range. The leachate treated is discharged into the qualified water tank through the reuse water pipeline. The DTRO membrane needs a high-pressure pump to drive, and the pressure is more than 8 MPa. The energy recovery device is arranged at the concentrated water end to recover the energy of this part, which can reduce the selection of the high-pressure pump for feeding and save more than 30% of the energy consumption of this section.
Claims
1. A full membrane treatment device for reducing the amount of landfill leachate, characterized by: The garbage leachate reduction full membrane treatment device comprises a biological membrane treatment device, a fractional membrane group treatment device, a softening membrane treatment device, a reduction DTRO membrane treatment device and a circulating heat exchanger.
2. The landfill leachate reduction full-membrane treatment apparatus according to claim 1, characterized by: The reduction DTRO membrane treatment device comprises a reduction DTRO membrane reaction tank and a recycled water pipeline.
3. The landfill leachate reduction full membrane treatment apparatus of claim 2, wherein: The softening membrane treatment device comprises a softening membrane reaction tank, a blowdown pipe and a transmission pipeline.
4. The landfill leachate reduction full membrane treatment apparatus of claim 3, wherein: The fractional membrane group treatment device comprises a fractional membrane reaction tank, a monovalent salt water pipeline and a divalent salt water pipeline.
5. The landfill leachate reduction full membrane treatment apparatus of claim 1, wherein: The biological membrane treatment device comprises an anaerobic membrane group, an aerobic membrane group and a biological membrane transmission pipeline.