CN111517465B - Advanced treatment integrated equipment and treatment method for aged leachate - Google Patents
Advanced treatment integrated equipment and treatment method for aged leachate Download PDFInfo
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- CN111517465B CN111517465B CN202010363532.7A CN202010363532A CN111517465B CN 111517465 B CN111517465 B CN 111517465B CN 202010363532 A CN202010363532 A CN 202010363532A CN 111517465 B CN111517465 B CN 111517465B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
Abstract
The invention discloses advanced treatment integrated equipment and a treatment method for aged leachate. The device comprises an alternate internal circulation biological filter, a powdered activated carbon adsorption clarification tank and a powdered activated carbon size mixing tank; the powdered activated carbon adsorption clarification tank comprises a central water inlet pipe arranged in the tank body and hollow balls filled in the central water inlet pipe; the top of the central water inlet pipe is a water inlet end and is communicated with the alternate internal circulation biological filter and the powdered activated carbon size mixing tank through pipelines; the bottom of the central water inlet pipe is a water outlet end and is provided with a perforated filter plate; a circular truncated cone-shaped flow guide hopper is arranged below the perforated filter plate; and a lift pump is arranged on a communication pipeline between the central water inlet pipe and the powdered activated carbon slurry mixing tank. The advanced treatment of the aged leachate by using the equipment can realize the removal of pollutants such as nitrogen, difficultly degraded COD (chemical oxygen demand) and the like in the water body and the removal of powdered activated carbon, ensure the clear effluent and have good water body purification effect.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to advanced treatment integrated equipment and a treatment method for aged leachate of an alternate internal circulation biological filter powdered activated carbon adsorption clarification tank.
Background
2.7 thousands of existing irregular refuse landfills in China, 1600 regular sanitary landfills, the total quantity of stored refuse exceeds 80 hundred million tons, and the floor area is about 5 hundred million square meters. The old leachate treatment problem in the process of managing the stored domestic garbage has two common solutions: transporting the percolate to a percolate treatment plant of a normal landfill for treatment; secondly, newly building a percolate treatment facility or treating by utilizing movable treatment equipment, and carrying out nano-tube discharge or direct discharge after reaching the standard. The former has high transportation cost and is limited by uncertain factors such as unit processing scale; the latter has large investment once. The current mainstream leachate advanced treatment technology comprises a membrane treatment technology (ultrafiltration, nanofiltration and reverse osmosis) and an advanced oxidation method (an ozone method and a Fenton oxidation method), wherein the membrane treatment technology has the problems that the service life and the treatment flux of a membrane are influenced by membrane pollution, and the generated concentrated solution is difficult to treat; the advanced oxidation technology has high treatment cost and large amount of generated chemical sludge. In a word, the advanced treatment of the aged percolate is lack of an economical and efficient applicable technology.
Based on this, the chinese patent application No. 201410694007.8 discloses a method and a system for advanced treatment of landfill leachate, which is mainly to further treat the effluent after the previous MBR process by reverse osmosis membrane technology. However, the following problems still exist in the technology: the concentration polarization phenomenon in the membrane treatment process is more prominent, and the problem of membrane pollution is not well solved all the time, so that the membrane component is frequently replaced, and the operation and maintenance cost is high; in addition, the concentrated solution generated by the reverse osmosis technology has complex components and is difficult to recycle, and if the concentrated solution is not properly treated, more serious secondary pollution is brought to the environment.
The Chinese patent application with the patent application number of 201610288693.8 discloses a landfill leachate advanced treatment system and a treatment method, wherein most suspended and colloidal organic matters, heavy metal ions, total phosphorus and other pollutants in wastewater are removed through a coagulation sedimentation tank; the organic matter which is difficult to degrade is further removed by utilizing an advanced oxidation separation device; total nitrogen and organic matters are further removed by a front biological film denitrification and decarbonization device. The invention has higher impact load resistance, can synchronously remove pollutants such as TP, COD, ammonia nitrogen, total nitrogen and the like, but still has the following problems: 1) a coagulative precipitator is required to be added, the chemical sludge amount is large, and secondary pollution is easy to generate; 2) advanced oxidation technology is expensive to process.
In a word, economic and efficient advanced treatment technology and equipment for aged percolate are lacked at present.
Disclosure of Invention
1. Problems to be solved
The invention provides advanced treatment integrated equipment and a treatment method for aged leachate, aiming at the problems of membrane pollution, high operation and maintenance cost and difficult treatment of concentrated solution in a membrane separation technology in the prior advanced treatment technology for the aged leachate and the problems of high treatment cost and large chemical sludge amount in an advanced oxidation technology, wherein the advanced treatment integrated equipment comprises the following steps:
the provided advanced treatment integrated equipment for the aged leachate realizes denitrification and partial reduction of difficultly degraded COD through pretreatment of the alternate internal circulation biological filter, and is matched with the powdered activated carbon adsorption clarification tank to further realize the removal of the difficultly degraded COD and suspended impurities in the water body and realize the advanced treatment of the aged leachate;
according to the advanced treatment method for the aged leachate, denitrification and partial degradation-resistant COD reduction are realized through pretreatment, the removal of the degradation-resistant COD and suspended impurities in the water body is further realized by matching with a powdered activated carbon adsorption clarification tank, and the advanced treatment of the aged leachate is realized.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
an advanced treatment integrated device for aged leachate comprises an alternate internal circulation biological filter (the concrete structure and operation principle of the alternate biological filter refer to patent No. 201510403832.2, an alternate internal circulation biological filter sewage treatment device and a using method thereof), and is used for treating the aged leachate after pretreatment; the powder activated carbon slurry mixing tank is used for mixing powder activated carbon slurry; the powder activated carbon adsorption clarification tank comprises a central water inlet pipe arranged in a tank body; the bottom of the central water inlet pipe is provided with an open-pore filter plate, and hollow balls are filled in the central water inlet pipe; a circular truncated cone-shaped flow guide hopper is arranged below the perforated filter plate; in the scheme, after treated effluent of the alternate internal circulation biological filter and powdered activated carbon slurry are introduced into the powdered activated carbon adsorption clarification tank, vertical flow is generated in the central water inlet pipe, micro-vortex is formed when the effluent flows through the hollow ball, and then the effluent slowly rises along the whole water passing section under the action of the cone-shaped flow guide hopper to form a suspended sludge layer, so that the advanced treatment of aged leachate is realized.
According to the preferable scheme, a high-efficiency denitrification system for treating the aged landfill leachate by using a humic filler aerobic fixed bed anoxic MBR (membrane bioreactor) combination is used for pretreating the aged landfill leachate, the system comprises a plurality of stages of treatment units which are connected in series, and a water pump is arranged between every two adjacent stages of treatment units; a filtering device is arranged in the anoxic MBR reactor and comprises a flat ultrafiltration membrane component for solid-liquid separation, a water inlet of the anoxic MBR reactor is arranged at the bottom of the reactor, and a water outlet of the anoxic MBR reactor is arranged at the top of the reactor; the system also comprises a fan and an air pipe, wherein an air inlet and an air outlet are respectively arranged at the bottom and the top of the aerobic fixed bed of the humic filler, the fan is respectively communicated with the air outlet and the air pipe, the air pipe is communicated with the air inlet, the fan is used for continuously sucking air from the air outlet, the air pipe is used for conveying the air sucked by the fan to the air inlet, and the air passes through the filler in the fixed bed and is discharged from the air outlet; a packing layer and a crushed stone layer are laid in the humic filler aerobic fixed bed reactor from top to bottom, and the air inlet is formed in the crushed stone layer.
Preferably, the upper part of the powdered activated carbon adsorption clarification tank is provided with an overflow weir; the lower part of the powdered activated carbon adsorption clarification tank is also provided with a sludge hopper, preferably an inverted trapezoidal sludge hopper, and a certain height difference is formed between the bottom end of the cone-shaped flow guide hopper and an upper opening of the sludge hopper, wherein the height difference is preferably 0.3-0.5 m.
According to the preferential scheme, the alternate internal circulation biological filter is an alternate internal circulation biological filter, the alternate internal circulation biological filter comprises a water inlet tank, an aeration unit, a biological filter and a circulating pipeline, the biological filter is sequentially arranged into a blank area, a packing layer, a bearing layer and a water distribution area from top to bottom, a partition plate is arranged in the middle of the area formed by the blank area, the packing layer and the bearing layer, the filter A is arranged on the left side of the partition plate, and the filter B is arranged on the right side of the partition plate; the water inlet tank is arranged on the side surface of the top of the biological filter and is respectively communicated with the filter A and the filter B through a water inlet pipe of a circulating pipeline, a water outlet pipe of the circulating pipeline is also respectively communicated with the filter A and the filter B, and the water outlet pipe is communicated with a central water inlet pipe of the powdered activated carbon adsorption clarification tank; one end of an aeration pipe of the aeration unit is communicated with the lower part of the biological filter, and the other end of the aeration pipe is connected with a fan.
Preferably, the hollow ball can be made of a material with the density ranging from 1.05 to 1.25g/cm 3 The material of (b) may be any one of PVC (polyvinyl chloride), PP (polypropylene) or ABS (ABS plastic); the diameter of the hollow ball is phi 30-50 mm; and/or the filling density of the hollow ball in the central water inlet pipe is 70-80%.
Preferably, the aperture of the opening filter plate is 20-30 mm; and/or the hole center distance between adjacent holes of the hole-opening filter plate is 20-30 mm.
Preferably, the central water inlet pipe is communicated with the powdered activated carbon size mixing tank through a pipeline, and a lift pump is arranged on the communicated pipeline.
Preferably, the integrated advanced treatment equipment for the aged percolate also comprises a sludge storage tank communicated with a sludge hopper through a sludge suction pipe.
An advanced treatment method for aged leachate, comprising the following steps:
1) treating the aged leachate after pretreatment by using an alternate internal circulation biological filter, wherein the treated effluent is wrapped with biosolids mainly stripped of a biological membrane;
2) introducing the effluent and the powdered activated carbon slurry obtained in the step 1) into a powdered activated carbon adsorption clarification tank, further adsorbing the nondegradable COD in the effluent obtained in the step 1) by using the powdered activated carbon, flocculating biosolids contained in the effluent and the powdered activated carbon, slowly ascending the water along the whole water passing section under the action of a cone-shaped flow guide hopper to form a suspended sludge layer, intercepting and adsorbing suspended impurities and free powdered activated carbon in the water, and realizing deep treatment of aged leachate.
Preferably, the step 2) comprises an early starting stage and a normal operation stage of the powdered activated carbon adsorption clarifier;
the step 2) comprises an early stage starting stage and a normal operation stage of the powdered activated carbon adsorption clarification tank;
in the early stage starting stage, the effluent in the step 1) is continuously introduced into a powdered activated carbon adsorption clarification tank, and simultaneously powdered activated carbon slurry is continuously introduced into the powdered activated carbon adsorption clarification tank, after a clear mud-water interface appears in the powdered activated carbon adsorption clarification tank and the removal rates of the powdered activated carbon and suspended impurities are relatively stable, the starting is finished, and then the operation is shifted to a normal operation stage;
and in the normal operation stage, the effluent and the powdered activated carbon slurry in the step 1) are continuously introduced into the powdered activated carbon adsorption clarification tank, the effluent and the powdered activated carbon slurry vertically flow in the central water inlet pipe, a micro-vortex is generated when the effluent and the powdered activated carbon slurry pass through the hollow ball, then the effluent and the powdered activated carbon slurry slowly rise along the whole water passing section in the tank body under the action of the circular truncated cone-shaped diversion hopper, and the effluent and the powdered activated carbon slurry flow out through the overflow weir after passing through the suspended sludge layer.
Preferably, the mass percentage concentration of the powdered activated carbon slurry is 10-20%, the introduction amount of the powdered activated carbon slurry is determined according to the concentration of the organic matters difficult to degrade in the effluent water in the step 1), and the COD in the powdered activated carbon adsorption clarification tank at the normal operation stage is generally kept at the section, wherein the mass percentage of the powdered activated carbon is 1: 1.
3. advantageous effects
Compared with the prior art, the invention has the beneficial effects that: the advanced treatment integrated equipment and method for the aged leachate, provided by the invention, are combined with a high-efficiency denitrification system for treating the aged landfill leachate by combining a humic filler aerobic fixed bed anoxic MBR (membrane bioreactor), so as to pretreat the aged leachate, and the pretreated aged leachate is further treated by using an alternate internal circulation biological filter, so that the denitrification of a water body and the reduction of partial difficultly-degradable COD (chemical oxygen demand) are realized;
the treated effluent (wrapped with biological solids mainly containing exfoliated biomembranes) of the alternate internal circulation biological filter is mixed with powdered activated carbon slurry and then is introduced into the powdered activated carbon adsorption clarification tank, micro-vortex disturbance is generated when hollow spheres flow through the central water inlet pipe, and by utilizing the micro-vortex principle, the biological flocculation efficiency of the biological solids and the powdered activated carbon can be effectively improved, and the sedimentation performance of the powdered activated carbon is improved;
then the water slowly rises along the whole water passing section under the action of the circular truncated cone-shaped flow guide hopper, a dynamic balance relation exists between the settling velocity of biological flocs in the water and the rising flow velocity of the water, a relatively stable suspended sludge layer can be gradually formed, free powdered activated carbon without biological flocculation and other suspended impurities can be further intercepted by utilizing the adsorption, interception, contact flocculation and other actions of the suspended sludge layer, and finally the advanced treatment of the aged percolate is realized.
Drawings
FIG. 1 is a top view of the integrated advanced treatment equipment for aged leachate provided by the present invention;
FIG. 2 is a sectional view along the A-A direction of the advanced treatment integrated equipment for the aged leachate provided by the invention;
FIG. 3 is a B-B direction cross-sectional view of the advanced treatment integrated equipment for aged leachate provided by the invention;
FIG. 4 is a schematic structural diagram of an alternate internal circulation biological filter;
FIG. 5 is a schematic structural diagram of a high-efficiency denitrification system for treating aged landfill leachate by combining a humic filler aerobic fixed bed and an anoxic MBR; in the figure:
1. a raw water pool; 2. a first stage anoxic MBR reactor; 3. a second stage anoxic MBR reactor; 4. a third stage anoxic MBR reactor; 5. a fourth stage anoxic MBR reactor; 6. a water outlet pool; 7. a first stage aerobic fixed bed; 8. a second stage aerobic fixed bed; 9. a third stage aerobic fixed bed; 10. a fourth-stage aerobic fixed bed; 11. a water pump; 12. a stirring device; 13. a flat ultrafiltration membrane module; 14. a water inlet pipe; 15. a water outlet pipe; 16. a return pipe; 17. an air inlet; 18. an air outlet; 19. an air duct; 20. a fan; 21. a carbon source storage pool; 22. a high-level water tank; 23. a carbon source conveying pipe; 24. an electric ball valve; 25. a lift pump; 26. an overflow pipe; 27. a PLC automatic control cabinet; 28. a sensor; 29. a sealing cover;
30. alternative internal circulation biological filter; 31. a water inlet groove; 32. a filler layer; 33. a support layer; 34. a partition plate; 35. a water inlet pipe; 36. a water outlet pipe; 37. a fan; 38. perforating a filter plate; 39. an aeration pipe;
40. a powdered activated carbon adsorption clarification tank; 41. a lift pump; 42. a central water inlet pipe; 43. hollow spheres; 44. opening a filter plate; 45. a circular truncated cone-shaped diversion hopper; 46. a sludge hopper; 47. a mud storage pool; 48. an overflow weir; 49. a mud suction pipe; 50. powder active carbon mixing tank.
Detailed Description
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or the two elements can be directly connected together; when an element is referred to as being "connected" to another element, it can be directly connected to the other element or the two elements may be directly integrated. In addition, the terms "upper", "lower", "left", "right" and "middle" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the relative positions may be changed or adjusted without substantial technical changes.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs; as used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As used herein, "about" is used to provide the flexibility and inaccuracy associated with a given term, measure or value. The degree of flexibility for a particular variable can be readily determined by one skilled in the art.
As used herein, "adjacent" refers to two structures or elements being in proximity. In particular, elements identified as "adjacent" may abut or be connected. Such elements may also be near or proximate to each other without necessarily contacting each other. In some cases, the precise degree of proximity may depend on the particular context.
The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
Lengths, amounts, and other numerical data may be presented herein in a range format. It is to be understood that such a range format is used merely for convenience and brevity and should be interpreted flexibly to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a numerical range of about 1 to about 4.5 should be interpreted to include not only the explicitly recited limit values of 1 to about 4.5, but also include individual numbers (such as 2, 3, 4) and sub-ranges (such as 1 to 3, 2 to 4, etc.). The same principle applies to ranges reciting only one numerical value, such as "less than about 4.5," which should be construed to include all of the aforementioned values and ranges. Moreover, such an interpretation should apply regardless of the breadth of the range or feature being described.
The specific structure and operation principle of the alternate internal circulation biological filter are the same as those of an alternate internal circulation biological filter sewage treatment device and a using method thereof in patent No. 201510403832.2.
The characteristic of the aged leachate determines that the aged leachate is difficult to reach the standard and discharge by adopting biological treatment alone, so a combined treatment process, namely a combined process of pre-pretreatment and post-advanced treatment, is usually adopted, and therefore, the aged leachate advanced treatment integrated equipment provided by the invention can be used with a high-efficiency denitrification system for treating the aged landfill leachate by combining a humic filler aerobic fixed bed anoxic MBR (membrane bioreactor) and can also be used with the existing biochemical pretreatment mode.
The powdery activated carbon adsorption clarification tank vertical flow sedimentation tank is formed by transformation.
The invention is further described below with reference to the accompanying drawings.
The advanced treatment integrated equipment for the aged leachate provided by the invention can be combined with a high-efficiency denitrification system for treating the aged landfill leachate by combining a humic filler aerobic fixed bed anoxic MBR. As shown in figure 5, the efficient denitrification system for treating the aged landfill leachate by the combination of the aerobic fixed bed and the anoxic MBR of the humic filler comprises a biological reaction unit, a carbon source adding device, a forced ventilation system, a PLC automatic control cabinet 27 and the like, wherein the biological reaction unit is formed by connecting four stages of aerobic fixed beds of the humic filler and the anoxic MBR in series.
The biological reaction unit comprises a first-stage aerobic fixed bed 7, a first-stage anoxic MBR reactor 2, a second-stage aerobic fixed bed 8, a second-stage anoxic MBR reactor 3, a third-stage aerobic fixed bed 9, a third-stage anoxic MBR reactor 4, a fourth-stage aerobic fixed bed 10 and a fourth-stage anoxic MBR reactor 5. Every grade of good oxygen fixed bed reactor and oxygen deficiency MBR bioreactor are combined into a processing unit, the oxygen deficiency MBR bioreactor goes out water and promotes through water pump 11, gets into the good oxygen fixed bed reactor of next stage through inlet tube 14, the play water after the good oxygen fixed bed treatment in every processing unit is from flowing into oxygen deficiency MBR bioreactor through outlet pipe 15, and four combination process units loop through water pump 11, inlet tube 14 and outlet pipe 15 and establish ties. Each level of humic filler aerobic fixed bed reactor adopts PVC high polymer material as an overground enclosure structure, the total height is 2.5m, and the diameter is 20 cm; the fixed bed is respectively provided with a packing layer and a rubble layer from top to bottom. Wherein the thickness of the humus filler in the filler layer is 1.5-3 m, macadam with the thickness of 0.2-0.3 m is laid on the bottom crushed stone layer for water drainage and air intake, and the air inlet 17 of the fixed bed reactor is positioned on the bottom crushed stone layer; the center and the side wall of the top of the fixed bed are respectively provided with an air outlet 18 and a water inlet, and the top is rigidly sealed by a PVC sealing cover 29. Each grade of anoxic MBR bioreactor is an underground rigid tank body with a reinforced concrete structure, the length is 1m, the width is 0.5m, the effective water depth is 0.5m, and the height is 0.2 m. The bottom of the reactor is provided with a stirring device 12 to ensure continuous anoxic stirring; a flat ultrafiltration membrane component 13 is arranged in the reactor, and can effectively realize solid-liquid separation of sludge and reactor effluent; the top of the reactor is respectively provided with a water inlet and a water outlet. The stirring device 12 utilizes the jet mode of the submersible sewage pump to stir, has good stirring effect, is beneficial to mud-liquid contact, and improves the denitrification capability of the anoxic MBR.
The forced air system includes a fan 20 and an air duct 19. The fan 20 adopts a vortex fan with a large suction vacuum degree, which can provide sufficient air pressure and air volume and has low energy consumption. The material of the air pipe 19 is determined according to the gas temperature, a galvanized steel pipe is adopted in a high-temperature section, and a PVC pipe is adopted in a low-temperature section. The fan sucks air from the air outlet 18 at the top of each stage of fixed bed reactor continuously to promote air to enter from the air inlet 17 at the lower part of the fixed bed, pass through the gravel layer and the packing layer of the fixed bed, and then is extracted from the air outlet 18 through the fan 20, so that a continuous aerobic reaction environment is provided for the fixed bed reactors.
The carbon source adding device utilizes the high-level water tank 22 to uniformly supplement a proper amount of carbon source to the four-stage anoxic MBR, wherein the type of the carbon source is acetic acid; the carbon source adding device comprises a carbon source storage tank 21, a high-level water tank 22, an electric ball valve 24, a lift pump 25, a carbon source conveying pipe 23 and an overflow pipe 26. Wherein, four liquid outlets are arranged at the same height at the lower part of the side wall of the high-level water tank 22, and each liquid outlet is connected with an electric ball valve 24 for controlling the carbon source adding process of each stage; the upper part is respectively provided with an overflow port and a liquid inlet for overflow and liquid inlet.
The PLC automatic control cabinet 27 is independent of the biological reaction unit, and the PLC automatic control cabinet 27 controls the opening and closing of the water pump 11, the fan 20, the stirring device 12, the electric ball valve 24 and the lifting pump 25 through the sensor 28, so that the full-automatic operation of the system is realized.
The efficient denitrification system for treating the old landfill leachate by utilizing the aerobic fixed bed anoxic MBR combination of the humic filler comprises the following steps: the treatment unit consisting of each level of the humic filler fixed bed and the anoxic MBR operates in an intermittent water inlet mode, wherein the treatment unit operates in a trickling filter mode and automatically flows out water, and forms an aerobic biological reaction environment through continuous forced ventilation; the latter firstly inoculates and acclimates the denitrification activated sludge, runs in a continuous stirring mode and intermittently discharges water in a suction mode through a built-in flat ultrafiltration membrane 13, and the water discharging time and flow rate of the water discharge and the next stage water inlet time and flow rate are matched; and the external carbon source is quantitatively added by adopting a high-level water tank according to the principle of graded denitrification and the calculation of the carbon source demand.
By regulating and controlling the process operation parameters, the specific flow is as follows:
1) firstly, the percolate enters a first-stage aerobic fixed bed 7 from a raw water pool 1 through a water pump 11, a forced ventilation system continuously ventilates the first-stage aerobic fixed bed 7 and fully performs nitration reaction by utilizing indigenous microorganisms in humic filler;
2) the effluent of the first-stage aerobic fixed bed 7 automatically flows into the first-stage anoxic MBR reactor 2, anoxic denitrification reaction is carried out by using anoxic activated sludge in the first-stage anoxic MBR reactor, and the stirring device 12 continuously stirs. Meanwhile, adding a proper amount of acetic acid as a supplementary carbon source to enhance the anoxic denitrification process of the reactor.
3) The effluent of the first-stage anoxic MBR reactor 2 enters a second-stage humic filler aerobic fixed bed 8 through a water pump 11 for reaction and then automatically flows into a second-stage anoxic MBR reactor 3 for secondary unit treatment.
4) And in the same way, the effluent is finally treated by the fourth-stage aerobic fixed bed 10 and the anoxic MBR reactor 5 and then is conveyed to the effluent pool 6 by the water pump 11 to obtain system effluent, and part of the effluent flows back into the raw water pool 4 through the return pipe 16 to be mixed with the raw water. The water inlet time of the system is set by using the PLC automatic control cabinet 27. The water pump 11 in this embodiment is a diaphragm high-pressure water pump, and can provide sufficient lift and water pressure.
The specific process of automatically adding the carbon source is as follows: the prepared acetic acid solution is used as a supplementary carbon source of each stage of anoxic MBR reactor and stored in a carbon source storage tank 21, the acetic acid solution is pumped into a high-level water tank 22 through a lifting pump 25, the solution in the high-level water tank 22 is always kept at an overflow water level, and the overflow solution returns to the carbon source storage tank 21 through an overflow pipe 26. The lift pump 25 in this embodiment is a submersible sewage pump to provide sufficient lift and bolus flow.
The carbon source adding time is set by the PLC automatic control cabinet 27 so as to control the adding amount of the carbon source, when the water inlet of each aerobic fixed bed is finished, the electric ball valve 24 is opened, the solution flows into each anoxic MBR due to potential energy difference, the electric ball valve 24 is closed, and the automatic carbon source adding process is completed.
The advanced treatment integrated equipment for the aged leachate is connected with the efficient denitrification system for treating the aged landfill leachate by combining the aerobic fixed bed anoxic MBR (membrane bioreactor) with the humic filler.
As shown in FIG. 1, the advanced treatment integrated equipment for aged leachate provided by the invention comprises a powdered activated carbon adsorption clarification tank 40, and an alternate internal circulation biological filter 30, a powdered activated carbon slurry mixing tank 50 and a sludge storage tank 47 which are respectively communicated with the powdered activated carbon adsorption clarification tank 40 through pipelines; as shown in fig. 2 and 3, a central water inlet pipe 42 is arranged at the upper part in the tank body of the powdered activated carbon adsorption clarification tank 40, the top of the central water inlet pipe 42 is a water inlet end and is respectively communicated with the alternate internal circulation biological filter 30 and the powdered activated carbon size mixing tank 50 through pipelines, and a lift pump is arranged on the communication pipeline of the central water inlet pipe 42 and the powdered activated carbon size mixing tank 50; the central water inlet pipe 42 is filled with a hollow ball 43, the bottom of the central water inlet pipe is a water outlet end and is provided with an opening filter plate 44, and a circular truncated cone-shaped flow guide hopper 45 is arranged and connected below the opening filter plate 44.
As shown in fig. 4, the alternate internal circulation biological filter 30 comprises a water inlet tank 31, an aeration unit, a biological filter and a circulation pipeline, wherein the biological filter is sequentially provided with a blank area, a packing layer 32, a supporting layer 33 and a water distribution area from top to bottom, a partition plate 34 is arranged in the middle of the area formed by the blank area, the packing layer 32 and the supporting layer 33, the left side of the partition plate 34 is a filter A, and the right side of the partition plate 34 is a filter B; a perforated filter plate 38 is arranged between the bearing layer 33 and the water distribution area, so that sewage can circulate between the filter A and the filter B through the water distribution area; the packing layer 32 is filled with granular packing, such as ceramsite and light plastic particles; the circulating pipeline comprises a water inlet pipe 35 and a water outlet pipe 36, the plane of the water outlet pipe 36 is higher than the plane of the water inlet pipe 35, the water inlet groove 31 is arranged on the side surface of the top of the biological filter and is respectively communicated with the filter A and the filter B through the water inlet pipe 35 of the circulating pipeline, the water outlet pipe 36 of the circulating pipeline is also respectively communicated with the filter A and the filter B, and the water outlet of the water outlet pipe 36 extends out of the biological filter; one end of an aeration pipe 39 of the aeration unit is communicated with the lower part of the biological filter, and the other end is connected with a fan 37. The alternate internal circulation biological filter 30 is communicated with a central water inlet pipe 42 of the powdered activated carbon adsorption clarification tank 40 through a water outlet pipe 36.
As shown in fig. 3, the powdered activated carbon adsorption clarifier 40 is further provided with an overflow weir 48 at the upper part and a sludge hopper 46 (preferably an inverted trapezoidal sludge hopper) at the lower part, and a certain height difference is provided between the bottom end of the truncated cone-shaped diversion hopper 45 and the upper opening of the sludge hopper 46; the mud storage tank 47 is communicated with a mud bucket 46 through a mud suction pipe 49.
The height difference between the bottom end of the general round table-shaped diversion hopper 45 and the upper opening of the sludge hopper 46 is 0.3-0.5 m; the diameter of the central water inlet pipe is 0.5m, the diameter of the hollow ball 43 is phi 30-50mm, and the filling density of the hollow ball 43 in the central water inlet pipe 42 is set to be 70-80%; the aperture of the opening filter plate 44 is 20-30mm, and the hole center distance between adjacent openings is 20-30mm, although the above parameters can be adjusted correspondingly according to the actual engineering situation. The hollow ball can be made of materials with the density range of 1.05-1.25 g/cm 3 The material of (2) can also be any one of PVC (polyvinyl chloride), PP (polypropylene) or ABS (ABS plastic), so that the engineering implementation is convenient in practical application or the material is convenient to be purchased in the market.
The alternate internal circulation biological filter 30 in the advanced treatment integrated equipment for the aged percolate is used for pretreating the percolate, and the powdered activated carbon slurry mixing tank 50 is used for preparing adsorbent slurry; the steps and the operation principle when the advanced treatment integrated equipment for the aged percolate is utilized to treat the aged percolate are as follows:
firstly, the operation principle is as follows:
the aged leachate is pretreated by a high-efficiency denitrification system for treating the aged landfill leachate by utilizing a humic filler aerobic fixed bed anoxic MBR combination, then is introduced into an alternate internal circulation biological filter 30 (patent number: 201510403832.2, patent name: an alternate internal circulation biological filter sewage treatment device and a using method thereof) for treatment, the denitrification is realized, partial difficultly degraded COD is reduced, and the effluent enters a powdered activated carbon adsorption clarification tank 50.
The effluent (carrying biological solids mainly stripped biological membranes) of the alternate internal circulation biological filter 30 and powdered activated carbon slurry (the mass percent concentration of the powdered activated carbon slurry is 10-20%) are introduced into the powdered activated carbon adsorption clarification tank 40 together, the nondegradable COD in the effluent treated by the filter is further adsorbed by the powdered activated carbon, the water body vertically flows in the central water inlet pipe 42, and micro-vortex is generated when passing through the hollow spheres 43, so that the biological flocculation between the biological solids and the powdered activated carbon is enhanced, and the sedimentation performance of the powdered activated carbon is effectively improved;
subsequently, the mixed water body slowly rises along the whole water passing section after being uniformly distributed in the tank body of the powder activated carbon adsorption clarification tank 40 under the action of the circular truncated cone-shaped diversion hopper 45, and a relatively stable suspended sludge layer is gradually formed, and the suspended sludge layer has the effects of adsorption, interception, contact flocculation and the like on biosolids, other suspended impurities and free powder activated carbon in the water body, so that the solid-liquid separation efficiency of the water body and the free powder activated carbon, biosolid suspended matters and other suspended impurities in the water body can be further improved, the cleanliness of supernatant can be ensured, and the purpose of realizing deep treatment of aged leachate is achieved. During the period, a dynamic balance relation exists between the sedimentation velocity of the biosolids in the water body and the rising flow velocity of the water body; specifically, with the continuous introduction of the effluent of the alternate internal circulation biological filter 30, the thickness of the suspended sludge layer is increased along with the amount of the adsorbed and intercepted impurities, and the aged floc impurities in the suspended sludge layer are promoted to be settled in the sludge hopper 9 at the bottom of the filter under the action of the dynamic balance relation.
The sediment in the sludge hopper 9 enters the sludge storage tank 47 through a sludge suction pipe 49, and the supernatant is discharged from an overflow weir 48 at the upper part of the powdered activated carbon adsorption clarification tank 40.
Secondly, the operation mode is as follows:
1) an efficient denitrification system for treating the aged landfill leachate is used for pretreating the aged landfill leachate by utilizing a humic filler aerobic fixed bed anoxic MBR combination;
2) further processing the aged leachate after pretreatment by using an alternate internal circulation biological filter 30;
3) early start-up phase
The effluent (containing biological solid, suspended impurities and organic pollutants which are mainly wrapped with the exfoliated biomembrane) in the step 1) is continuously introduced into the powdered activated carbon adsorption clarification tank 40 from the water inlet end of the central water inlet pipe 42, meanwhile, powdered activated carbon slurry is continuously introduced into the powdered activated carbon adsorption clarification tank 40, the flow direction and the flow speed of the water body are changed under the action of the hollow ball 43 in the process that the water body flows downwards in the central water inlet pipe 42, a large amount of micro-vortex is formed, then the water body flows out of the central water inlet pipe 42 through the perforated filter plate 44, then the water body is uniformly distributed in the tank of the powdered activated carbon adsorption clarification tank 40 through the circular truncated cone-shaped flow guide hopper 45 and slowly rises along the whole water passing section, a clear mud-water interface can be gradually formed in the powdered activated carbon adsorption clarification tank 40, a relatively stable suspended sludge layer is formed, and after the suspended sludge layer keeps a stable removal rate (more than 90%) for the powdered activated carbon and the suspended impurities in the water body, indicating that the start is finished, and then switching to a normal operation stage;
in the whole process, the rising speed of the water body in the powdered activated carbon adsorption clarification tank along the whole water passing section needs to be controlled to be less than 1.1 mm/s;
3) stage of normal operation
The powdered activated carbon slurry prepared in the powdered activated carbon slurry mixing tank 50 is continuously introduced into the powdered activated carbon adsorption clarification tank 40 from the water inlet end of the central water inlet pipe 42 through the lift pump 41 and the conveying pipeline; meanwhile, the effluent in the step 1) is kept continuously introduced into a powdered activated carbon adsorption clarification tank 40;
when the water entering the central water inlet pipe 42 flows through the hollow ball 43, the flow direction and the flow speed of the water are changed to form a large amount of micro-vortex, so that the biological flocculation reaction between the biological solid suspended matters in the water discharged in the step 1) and the powdered activated carbon is enhanced, and the settling property of the powdered activated carbon is improved; then, the water body flows out of the central water inlet pipe 42 through the perforated filter plate 44, then the water body is uniformly distributed in the tank of the powdered activated carbon adsorption clarification tank 40 through the circular truncated cone-shaped diversion hopper 45 and slowly rises along the whole water passing section, and the water body passes through the suspended sludge layer to form supernatant liquid and flows out through the overflow weir 48;
when the sludge passes through the suspended sludge layer, free powdered activated carbon without bioflocculation and other suspended impurities can be further intercepted under the actions of adsorption, interception, contact flocculation and the like of the suspended sludge layer; the thickness of the suspended sludge layer can be increased along with the amount of the impurities retained by adsorption, so that the dynamic balance between the settling speed of the biological flocs and the rising flow speed of the water body is damaged, and the aged floc impurities in the suspended sludge layer are promoted to be settled in a sludge hopper 46 at the bottom of the tank;
the sediment in the sludge hopper 46 is periodically discharged into the sludge storage tank 47 by gravity sludge discharge via a sludge suction pipe 49.
Example 1
The advanced treatment integrated equipment for the aged leachate is used for treating the aged leachate pretreated by the efficient denitrification system for the aged landfill leachate through the combination of the aerobic fixed bed and the anoxic MBR (membrane bioreactor) with the humic filler.
As shown in FIG. 5, in this embodiment, the structure of the alternate inner circulation biological filter 30 is the same as that of embodiment 1 of "patent No. 201510403832.2, an alternate inner circulation biological filter sewage treatment plant and its use method". The water inflow is 50t/d, and the surface area of the biological filter pool is 25m 2 The design is 3m multiplied by 8.4m, the filter is divided into two filter chambers, and the volume of the filler is about 38m 3 The hydraulic load is 2m/d, the height of a water distribution chamber at the bottom is 600mm, the height of a supporting layer 33 is 50mm, a packing layer 32 above the supporting layer 33 adopts 3-4mm PE plastic particles or ceramsite, the height of the packing layer 32 is 1500mm, the height of a clear water area is 700mm, the height of the clear water area is 200mm, the total height of the filter tank is 3000mm, a 2mm hole sieve net is arranged on an aeration plate of a perforated filter plate 38, the reflux ratio is 200%, the alternating period of the process operation is 0.5d, the total water inflow is 3 times of the water inflow, and the total water inflow is 6.78m 3 /h。
In this embodiment, the water inflow of the powdered activated carbon adsorption clarifier 40 is 50m 3 D, the surface load is 1m/h, and the effective cross-sectional area is 2.26m 2 (ii) a In addition, the total height of the powdered activated carbon adsorption clarification tank 40 is 2.8m, the height of the powdered activated carbon adsorption clarification tank is 0.3m, the height of the sludge hopper 46 is 0.65m, and the height difference (buffer layer) between the bottom end of the truncated cone-shaped diversion hopper 45 and the upper opening of the sludge hopper 46 is 0.3 m; the flow rate of the central water inlet pipe 42 is designed to be 2.5mm/s, the diameter of the central water inlet pipe is 500mm, and the cross-sectional area of the central water inlet pipe 42 is 0.196m 2 (ii) a The hollow ball 43 made of PP and plastic with the diameter of phi 50mm is filled in the central water inlet pipe 42, and the filling rate of the hollow ball 43 in the central water inlet pipe 42 is 70-80%; the hole opening aperture of the perforated filter plate 44 at the bottom of the central water inlet pipe is 10mm, and the hole center distance is 20 mm. The diameter of the truncated cone-shaped diversion bucket 45 is 0.88m, the inclination angle between the side surface of the truncated cone-shaped diversion bucket 45 and the horizontal plane is 17 degrees, and the height of the truncated cone-shaped diversion bucket 45 is 0.13 m; the top overflow weir 48 adopts a triangular weir with an included angle of 90 degrees, and when the water depth of the overflow weir is 21mm, the flow of the single weir is 7.69m 3 The number of the triangular weirs is 8 for the single-side filter; the bottom sludge hopper 46 has a side wall inclination angle of 45 degrees, the height of the sludge hopper 46 is 0.65m, the upper bottom is 1.6 multiplied by 1.6m, the lower bottom is 0.3 multiplied by 0.3m, and the volume of the sludge hopper 46 is 0.68m 3 。
In this embodiment, the powdered activated carbon slurry mixing tank 50 is 1.6m × 1.3m × 0.9m, the height is 0.25m, the thickness of the tank bottom is 0.2m, and the effective height is 0.45m, so that the total height of the tank body is 0.9 m; the mass percentage concentration of the powdered activated carbon slurry prepared in the powdered activated carbon slurry mixing tank 50 is 10 percent, and the slurry density is 1.1g/cm 3 . The introduction amount of the powdered activated carbon slurry in the powdered activated carbon adsorption clarification tank 40 was 0.45m 3 And d, keeping the mass concentration of the powdered activated carbon in the powdered activated carbon adsorption clarification tank 40 at 1g/L in the normal operation stage.
TABLE 1 Water quality index of inlet and outlet water
As can be seen from the above table, after the treatment by the integrated equipment, various indexes of the effluent quality reach the nano-tube standard (GB 8978-1996).
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. An advanced treatment integrated device for aged leachate comprises an alternate internal circulation biological filter (30) for further treating the aged leachate after pretreatment; it is characterized by also comprising:
the powder activated carbon slurry mixing tank (50) is used for mixing powder activated carbon slurry;
the device comprises a powdered activated carbon adsorption clarification tank (40), wherein the powdered activated carbon adsorption clarification tank (40) comprises a central water inlet pipe (42) arranged in the tank body; the bottom of the central water inlet pipe (42) is provided with an open-pore filter plate (44), and hollow balls (43) are filled in the central water inlet pipe; a circular truncated cone-shaped flow guide hopper (45) is arranged below the perforated filter plate (44); the lower part of the powdered activated carbon adsorption clarification tank (40) is also provided with a sludge hopper (46), a certain height difference is formed between the bottom end of the cone-shaped diversion hopper (45) and an upper opening of the sludge hopper (46), and the height difference is 0.3-0.5 m;
the treatment of interior circulation biological filter (30) in turn goes out water and powder activated carbon thick liquid and lets in powder activated carbon adsorption clarification tank (40), take place vertical flow in central inlet tube (42), form the micro-vortex when flowing through clean shot (43), later in the cell body evenly distributed back along whole water cross section slowly rise and form the suspension mud sediment layer under the effect of round platform shape water conservancy diversion fill (45), hold back, adsorb suspension impurity and free powder activated carbon in the water, realize the advanced treatment of old age's leachate.
2. The advanced treatment integrated equipment for the aged percolate according to claim 1, wherein the powdered activated carbon adsorption clarifier (40) is provided with an overflow weir (48) at the upper part.
3. The advanced treatment integrated equipment for the aged percolate according to claim 1, wherein the alternate internal circulation biological filter (30) comprises a water inlet tank (31), an aeration unit, a biological filter and a circulation pipeline, the biological filter is sequentially provided with a blank area, a filler layer (32), a supporting layer (33) and a water distribution area from top to bottom, a partition plate (34) is arranged in the middle of the area consisting of the blank area, the filler layer (32) and the supporting layer (33), the left side of the partition plate (34) is a filter A, and the right side of the partition plate (34) is a filter B;
the water inlet tank (31) is arranged on the side surface of the top of the biological filter and is respectively communicated with the filter A and the filter B through a water inlet pipe (35) of a circulating pipeline, a water outlet pipe (36) of the circulating pipeline is also respectively communicated with the filter A and the filter B, and the water outlet pipe (36) is communicated with a central water inlet pipe (42) of a powdered activated carbon adsorption clarification tank (40);
one end of an aeration pipe (39) of the aeration unit is communicated with the lower part of the biological filter, and the other end is connected with a fan (37).
4. The advanced treatment integrated equipment for aged leachate according to any of claims 1-3, wherein,
the diameter of the hollow ball (43) is phi 30-50 mm;
and/or the filling density of the hollow ball (43) in the central water inlet pipe (42) is 70-80%;
the aperture of the opening filter plate (44) is 20-30 mm;
and/or the hole center distance between adjacent holes of the hole filter plate (44) is 20-30 mm.
5. The advanced treatment integrated equipment for aged leachate according to any of claims 1-3, wherein the central water inlet pipe (42) is in communication with the powdered activated carbon slurrying tank (50) through a pipeline, and the pipeline is provided with a lift pump (41).
6. The advanced treatment integrated equipment for aged leachate according to any of claims 1-3, further comprising: the sludge storage tank (47), the sludge storage tank (47) is communicated with the sludge hopper (46) through a sludge suction pipe (49).
7. A method for advanced treatment of aged leachate by using the aged leachate advanced treatment integrated plant as claimed in any one of claims 1 to 6, comprising the following steps:
1) treating the aged percolate after pretreatment by using an alternative internal circulation biological filter (30), wherein the treated effluent is wrapped with biosolids mainly stripped biological membranes;
2) introducing the effluent and the powdered activated carbon slurry obtained in the step 1) into a powdered activated carbon adsorption clarification tank (40), adsorbing the effluent obtained in the step 1) by using powdered activated carbon, flocculating biosolids contained in the effluent and the powdered activated carbon, slowly ascending the water along the whole water passing section under the action of a cone-shaped diversion hopper (45) to form a suspended sludge layer, intercepting and adsorbing suspended impurities and free powdered activated carbon in the water, and realizing deep treatment of aged leachate.
8. The advanced treatment method for the aged leachate according to claim 7, wherein the step 2) comprises a preliminary start-up phase and a normal operation phase of the powdered activated carbon adsorption clarifier (40);
in the early stage of starting, the effluent in the step 1) is continuously introduced into a powdered activated carbon adsorption clarification tank (40), and simultaneously powdered activated carbon slurry is continuously introduced into the powdered activated carbon adsorption clarification tank (40), and after a clear mud-water interface appears in the powdered activated carbon adsorption clarification tank (40) and the removal rates of powdered activated carbon and suspended impurities are relatively stable, starting is completed, and then the operation is shifted to a normal operation stage;
and in the normal operation stage, the effluent and the powdered activated carbon slurry in the step 1) are continuously introduced into the powdered activated carbon adsorption clarification tank (40), the effluent and the powdered activated carbon slurry vertically flow in the central water inlet pipe (42), micro-vortex flow is generated when the effluent and the powdered activated carbon slurry pass through the hollow spheres (43), and then the effluent and the powdered activated carbon slurry slowly rise along the whole water passing section after being uniformly distributed in the tank body under the action of the circular truncated cone-shaped flow guide hopper (45), and form supernatant after passing through the suspended sludge layer and flow out through the overflow weir (48).
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