CN112441689B - Membrane concentrate harmless treatment system and method - Google Patents
Membrane concentrate harmless treatment system and method Download PDFInfo
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Abstract
The invention relates to a membrane concentrate harmless treatment system and method, which solve the defects of the existing membrane concentrate treatment technology. The process integrates advanced technologies in the aspect of high-concentration organic wastewater treatment, proposes the concept of physical and chemical synergistic treatment, and decomposes organic pollutants in the membrane concentrated solution into CO2 and H2O harmless to the environment in a chemical treatment mode; separating ammonia nitrogen pollutants in the membrane concentrated solution into ammonia gas in a physical mode, and absorbing the ammonia gas by acid and alkali; the salt in the membrane concentrated solution is converted into solid miscellaneous salt in a physical mode, so that the full-amount harmless treatment of the membrane concentrated solution is realized.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to a membrane concentrate harmless treatment system and method.
Background
With the development of economy and the rapid promotion of urbanization construction, the number of the urban permanent population is increased, and the resource treatment of the generated household garbage is a big problem of the modern urbanization. At present, two main disposal modes of sanitary landfill and high-temperature incineration are generally adopted for municipal domestic waste treatment, both garbage leachate is generated in the treatment process, the components are complex, stink is easy to generate, and the garbage leachate contains various toxic and harmful substances, and if the garbage leachate is not properly treated in time, the natural water body can be polluted, so that the human health is harmed.
At present, most domestic refuse landfills and refuse incineration plants are provided with independent refuse leachate treatment stations, a mainstream treatment process comprising pretreatment, biochemical treatment and membrane advanced treatment is generally adopted, and main treatment units comprise: the pretreatment adopts physical methods such as solid-liquid separation, grating, coagulating sedimentation and the like to primarily remove slag substances and suspended substances in the leachate; in the biochemical treatment, pollutants in the leachate are biodegraded by utilizing the synergistic action of nitrobacteria and denitrifying bacteria, and an A/O + UF Membrane Bioreactor (MBR) system is usually designed; the membrane advanced treatment utilizes a membrane separation device to intercept pollutants which can not be treated biochemically in leachate, and a nanofiltration and reverse osmosis combined membrane separation process is usually adopted. The whole process system is safe, stable and efficient, can ensure that the system produced water reaches the discharge standard of circulating cooling water, and meets the requirement of self-absorption and recycling in a water production plant. In addition, emergency treatment equipment such as DTRO and the like is adopted in a part of refuse landfills to rapidly treat the percolate stock solution, so that the water level of the regulating tank is reduced.
However, the two types of landfill leachate treatment processes have the biggest defects that 20-50% of membrane concentrated solution containing high-concentration pollutants is generated in the membrane treatment process, and the membrane concentrated solution has the characteristics of complex components, high inorganic salt content, poor biodegradability, heavy metal content and the like, and is difficult to treat.
At present, the treatment of the membrane concentrated solution mainly adopts a decrement-transfer mode, namely, the membrane concentrated solution is further treated by recharging or hearth spraying after being secondarily concentrated by adopting the processes of high-pressure reverse osmosis, evaporation and the like, but basically, the pollution substances are not treated in a harmless way, so that the serious secondary pollution hidden danger exists, and the treatment is temporary and permanent.
Disclosure of Invention
The invention provides a membrane concentrate harmless treatment system and method, which solve the defects of the existing membrane concentrate treatment technology. The total harmless treatment process of membrane concentrated solution comprising pretreatment, advanced oxidation, membrane deamination and low-temperature evaporation integrates advanced technologies in the aspect of high-concentration organic wastewater treatment, and proposes a concept of physical and chemical synergistic treatment to decompose organic pollutants in the membrane concentrated solution into environmentally-friendly CO in a chemical treatment mode 2 And H 2 O; passing the ammonia nitrogen pollutant in the membrane concentrated solutionSeparating into ammonia gas by a physical mode and absorbing the ammonia gas by acid and alkali; the salt in the membrane concentrated solution is converted into solid miscellaneous salt in a physical mode, so that the full-amount harmless treatment of the membrane concentrated solution is realized.
The scheme for solving the technical problems is as follows: the utility model provides a membrane concentrate innocent treatment system, includes membrane concentrate reservoir, preliminary treatment reaction pond, type fenton catalytic oxidation system, membrane deamination system, low temperature MVR vaporization system and produces the pond, membrane concentrate reservoir, preliminary treatment reaction pond, type fenton catalytic oxidation system, membrane deamination system, low temperature MVR vaporization system, produce the pond and pass through the pipeline and connect in proper order, simultaneously ammonium salt recovery system links to each other with membrane deamination system branch line.
The Fenton-like catalytic oxidation system comprises a water pump, a security filter, a first-stage Fenton fluidized bed reaction kettle, a second-stage Fenton fluidized bed reaction kettle, a third-stage Fenton fluidized bed reaction kettle, a built-in ceramic microfiltration membrane assembly and an air blower which are sequentially communicated, wherein the air blower is connected with the bottoms of the first-stage Fenton fluidized bed reaction kettle, the second-stage Fenton fluidized bed reaction kettle, the third-stage Fenton fluidized bed reaction kettle and the built-in ceramic microfiltration membrane assembly through pipelines, and the water pump is communicated with the first-stage Fenton fluidized bed reaction kettle through the security filter.
And the one-level Fenton fluidized bed reaction kettle, the second-level Fenton fluidized bed reaction kettle and the third-level Fenton fluidized bed reaction kettle are internally erected and filled with Fenton-like supported solid catalyst fillers, and high-frequency ultrasonic generators are arranged on the outer walls of the one-level Fenton fluidized bed reaction kettle, the second-level Fenton fluidized bed reaction kettle and the third-level Fenton fluidized bed reaction kettle.
The membrane deamination system comprises an acid-base adjusting tank A, a water inlet pump, a cartridge filter, an integrated degassing membrane component, an acid-base adjusting tank B and a system water outlet pump which are sequentially communicated.
The invention has the beneficial effects that:
(1) The invention utilizes the physical and chemical cooperative treatment process to truly realize the resource treatment of the membrane concentrated solution, but not the traditional concentration-transfer treatment, thereby avoiding the problem of secondary environmental pollution caused by the recharging, back spraying, back filling and the like of the membrane concentrated solution;
(2) The Fenton-like catalytic oxidation system is used for degrading organic pollutants in the membrane concentrated solution, heterogeneous particle supported catalysts are matched with various oxidation agents, and meanwhile, the wastewater is subjected to graded serial cooperative treatment in a fluidized bed reaction kettle in combination with ultrasonic action. Compared with the traditional Fenton reagent method, the reaction activation energy and the sludge yield of Fenton-like catalytic oxidation are greatly reduced, and the reaction efficiency and the reaction rate are obviously improved;
(3) According to the invention, the membrane deamination system is used for degrading the ammonia nitrogen pollutant in the membrane concentrated solution, the hydrophobic hollow fiber membrane component is adopted to convert the ammonia nitrogen pollutant into ammonia gas in a fully-sealed state, and then the ammonia gas is absorbed by strong acid for secondary utilization, so that compared with the traditional deamination tower process, the energy consumption is greatly reduced, no secondary pollutant ammonia gas is leaked out, and the process is safe, green and environment-friendly;
(4) The MVR low-temperature evaporation system is used for removing salt in the membrane concentrated solution, and because organic pollutants such as ammonia nitrogen, humic acid and the like in the inlet water quality are removed, the water quality condition is better, the energy consumption and the service life of the MVR evaporator are obviously improved compared with other process systems, and the failure rate and the shutdown repair frequency are both reduced.
The membrane concentrate harmless zero-emission treatment method is carried out on the basis of the membrane concentrate harmless treatment system and comprises the following steps:
1. pretreatment: the method mainly comprises the steps of pre-aerating and pre-coagulating sedimentation of a stock solution in a membrane concentrated solution storage tank, removing suspended substances, calcium and magnesium ions and impurities in the membrane concentrated solution, and adjusting an acid-base buffer system through aeration;
2. fenton-like catalytic oxidation: carrying out mineralization degradation on organic pollutants in the pretreated membrane concentrated solution mainly through a multi-stage Fenton-like catalytic oxidation reaction system, wherein the products are CO2, H2O and NH4+; the reactor uses an upflow Fenton fluidized bed reaction kettle;
3. membrane deamination treatment: separating and converting residual ammonia nitrogen pollutants in the membrane concentrated solution after catalytic oxidation into ammonia gas by mainly combining a hydrophobic hollow fiber membrane and an acid-base potential difference, absorbing the ammonia gas by using strong acid, and performing secondary utilization;
4. MVR low-temperature evaporation: the membrane concentrated solution after deamination is subjected to salt separation treatment by a vacuum low-temperature evaporation system, the water vapor part is condensed to form water by the whole process, and the residual part is miscellaneous salt, so that the requirement of the water produced by the system on the salt content is met.
The Fenton-like catalytic oxidation treatment also comprises the step of reducing the concentration of suspended matters in the produced water to an acceptable value of a subsequent treatment unit by replacing the function of a traditional Fenton reaction secondary sedimentation tank through a matched ceramic microfiltration membrane system.
Chemical sludge generated by the Fenton-like catalytic oxidation treatment can be transported to a sludge concentration tank of a main process system for combination treatment.
The invention has the beneficial effects that:
(1) The membrane concentrated solution treatment process can be matched with conventional or emergency treatment processes for landfill leachate to effectively recycle the membrane concentrated solution, so that the problem of removal of the membrane concentrated solution of a leachate treatment station is solved;
(2) The membrane concentrated solution treatment process disclosed by the invention is reasonable and efficient in combination. The final produced water after the membrane concentrated solution is treated by the process system can reach the standard water quality in Table 1 of recycled cooling water reclaimed water quality standard (HG/T3923-2007), no secondary pollutant is generated and transferred, zero discharge recycling of the percolate membrane concentrated solution can be realized in a real sense, and the process system is green and environment-friendly;
(3) Although the number of the membrane concentrated solution treatment process units is increased compared with the traditional membrane concentrated solution treatment process, the whole operation cost is basically kept equal, the problem of secondary pollutant treatment is avoided, and the method has obvious economic and social benefits.
(4) The integral process system for treating the membrane concentrated solution is safe and stable in operation, and low in shutdown maintenance and overhaul frequency.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings. The detailed description of the present invention is given in detail by the following examples and the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic view of the flow structure of a refuse leachate membrane concentrate zero-emission treatment system according to the present invention;
FIG. 2 is a schematic view of the flow structure of a Fenton-like catalytic oxidation system of the landfill leachate membrane concentrate zero-release treatment system of the present invention;
fig. 3 is a schematic diagram of the flow structure of a membrane deamination system of the landfill leachate membrane concentrate zero-release treatment system of the present invention.
In the drawings, the components represented by the respective reference numerals are listed below:
1-storing membrane concentrated solution in a pool; 2-pretreating the reaction tank; a 3-Fenton-like catalytic oxidation system; 4-membrane deamination system; 5-an ammonium salt recovery system; 6-low temperature MVR evaporation system; 7-a water producing pool; 8-system water inlet pump; 9-cartridge filter; a 10-first-stage Fenton fluidized bed reaction kettle; 11-a second-stage Fenton fluidized bed reaction kettle; 12-a three-stage Fenton fluidized bed reaction kettle; a 13-Fenton-like supported solid catalyst packing layer; 14-an ultrasonic generator; 15-built-in ceramic microfiltration membrane module; 16-acid-base adjusting tank A; 17-deamination water inlet pump; 18-a cartridge filter; 19-an integrated degassing membrane module; 20-acid-base adjusting tank B; 21-water outlet pump of the system.
Detailed Description
The principles and features of the present invention are described below in conjunction with the accompanying fig. 1-3, which are provided by way of example only to illustrate the present invention and not to limit the scope of the present invention. The invention is described in more detail in the following paragraphs by way of example with reference to the accompanying drawings. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
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 intervening elements may also be present. When a component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.
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. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
As shown in figure 1, the invention discloses a garbage leachate membrane concentrated solution full-amount harmless zero-emission treatment system and a device, and the system mainly comprises a membrane concentrated solution storage tank 1, a pretreatment reaction tank 2, a Fenton-like catalytic oxidation system 3, a membrane deamination system 4, a low-temperature MVR evaporation system 6 and a water production tank 7 which are sequentially connected through pipelines. Wherein, ammonium salt recovery system 5 links to each other with 4 branches of membrane deamination system, and the ammonium salt that collects can regularly flow back to main body technology MBR unit and carry out secondary treatment. In addition, the chemical sludge generated by the Fenton-like catalytic oxidation system 3 can be transported to a main process sludge disposal unit for centralized treatment.
It should be noted that if the membrane concentrated solution treatment process provided by the patent of the invention is matched with the tail end of the DTRO emergency main treatment process for landfill leachate, sludge treatment equipment needs to be additionally added to a membrane concentrated solution treatment process system, and meanwhile, the ammonium salt concentrated solution after membrane deamination can be independently evaporated into a solid state through an MVR system and then transported outside for disposal.
The membrane concentrated solution after the main process treatment of the refuse landfill or the incineration plant is firstly conveyed to a concentrated solution storage tank 1 through a pipeline, after the membrane concentrated solution stays for 2 to 3 days, impurities are precipitated, the membrane concentrated solution is lifted to a pretreatment reaction tank 2 through a lifting pump, perforated aeration pipes or aeration discs are arranged in the tank, and after compressed air is introduced through an air blower to fully carry out aeration reaction for 1 to 2 days, the pretreatment of the membrane concentrated solution is completed.
As shown in fig. 2, the effluent of the pretreatment tank enters a fenton-like catalytic oxidation system 3. Specifically, the wastewater firstly passes through a water inlet pump 8 and a security filter 9 and then sequentially enters a first-stage Fenton fluidized bed reaction kettle 10, a second-stage Fenton fluidized bed reaction kettle 11 and a third-stage Fenton fluidized bed reaction kettle 12 to carry out a third-stage series Fenton-like catalytic oxidation reaction. A Fenton-like load type solid catalyst filler layer 13 is erected and filled in the single-stage reaction kettle; meanwhile, the outer wall of the single-stage reaction kettle is provided with a high-frequency ultrasonic generator 14, and ultrasonic waves are uniformly distributed around the kettle body under the action of the probe to complete ultrasonic wave synergistic reaction. After the catalytic oxidation reaction is finished, the produced water enters the membrane pool 15, and suspended impurities are filtered under the action of the built-in ceramic microfiltration membrane component.
As shown in fig. 3, the produced water enters the membrane deamination system 4 after self-priming by a pump. Specifically, the wastewater firstly enters an acid-base adjusting tank A16, the pH of the wastewater is adjusted to be strong alkaline by adding an alkaline medicament, the wastewater enters a unit core degassing membrane component 19 after passing through a water inlet pump 17 and a cartridge filter 18, ammonia nitrogen pollutants in the wastewater are converted into ammonia gas through the combined action of a hydrophobic hollow fiber membrane and the pH difference potential of acid and base, the produced water enters an acid-base adjusting tank B20 and is adjusted to be neutral by adding acid, and the ammonia gas is converted into ammonium salt through a strong acid absorption device 5 and flows back to the main process for secondary treatment.
The water produced by the membrane deamination system 4 enters the low-temperature MVR evaporation system 6 for salt separation treatment, and the MVR process unit has more successful application examples in related fields, so the process details are not explained in too much detail.
The water produced by the low-temperature MVR evaporation system 6 enters a final water producing tank 7 of the system, the water quality of the outlet water can reach the water quality of recycled cooling water reclaimed water standard (HG/T3923-2007), and no secondary pollutants are generated and transferred in the whole system.
The membrane concentrate harmless zero-emission treatment method is carried out on the basis of the membrane concentrate harmless treatment system and comprises the following steps:
1. pretreatment: the method mainly comprises the steps of pre-aerating and pre-coagulating sedimentation of a stock solution in a membrane concentrated solution storage tank, removing suspended substances, calcium and magnesium ions and impurities in the membrane concentrated solution, and adjusting an acid-base buffer system through aeration;
2. fenton-like catalytic oxidation: carrying out mineralization degradation on organic pollutants in the pretreated membrane concentrated solution mainly through a multi-stage Fenton-like catalytic oxidation reaction system, wherein the products are CO2, H2O and NH4+; the reactor uses an upflow Fenton fluidized bed reaction kettle;
3. membrane deamination treatment: separating and converting residual ammonia nitrogen pollutants in the membrane concentrated solution after catalytic oxidation into ammonia gas by mainly combining a hydrophobic hollow fiber membrane and an acid-base potential difference, absorbing the ammonia gas by using strong acid, and performing secondary utilization;
4. MVR low-temperature evaporation: the membrane concentrated solution after deamination is subjected to salt separation treatment by a vacuum low-temperature evaporation system, the water vapor part is condensed to form water by the whole process, and the residual part is miscellaneous salt, so that the requirement of the water produced by the system on the salt content is met.
The Fenton-like catalytic oxidation treatment also comprises the step of replacing the function of a traditional Fenton reaction secondary sedimentation tank by a matched ceramic microfiltration membrane system, so that the concentration of the suspended matters in the produced water is reduced to the acceptable value of a subsequent treatment unit.
Chemical sludge generated by the Fenton-like catalytic oxidation treatment can be transported to a sludge concentration tank of a main process system for combination treatment.
Example one
Table 1: water quality condition of membrane concentrated liquid pool of percolate treatment station of certain domestic refuse landfill in Guangshui city
The concentrated solution source of the embodiment is nanofiltration and reverse osmosis trapped concentrated solution of a main process membrane advanced treatment unit. As can be seen from Table 1, the water quality of the membrane concentrated solution tank has the characteristics of high conductivity, namely high salt content, high concentration of nonbiochemical refractory organic pollutants and high treatment difficulty.
The garbage leachate membrane concentrated solution full-amount harmless zero-emission treatment system provided by the invention is used for treating the membrane concentrated solution, and the treatment scale is 50m 3 And d, the single-day running time of the system is 20h. The nanofiltration reverse osmosis intercepted concentrated solution is firstly stored in a concentrated solution storage tank 1, is lifted to a pretreatment reaction tank 2 by a lifting pump after standing for 48 hours, perforated aeration pipes are uniformly laid at the bottom of the tank, a three-blade Roots blower is adopted for aeration, and the aeration air volume is 3.25m 3 Min, wind pressure of 0.06MPa and reaction time of 36-48h. The water produced by the pretreatment reaction tank 2 enters the Fenton-like catalytic oxidation system 3 under the action of the water inlet pump 8.
The main structure of the Fenton-like catalytic oxidation system 3 is formed by connecting three Fenton fluidized bed reaction kettles 10, 11 and 12 in series, a Fenton-like load type solid catalyst packing layer 13 is erected and filled in each single-stage reaction kettle, and the packing density is 35-50 kg/m 3 The porosity was 0.32. Meanwhile, the high-frequency ultrasonic generators 14 are arranged outside each single-stage reaction kettle, and 60KHz ultrasonic waves are uniformly transmitted to the periphery of the kettle body through the leads and the probes, so that the ultrasonic wave synergistic reaction is realized. The wastewater sequentially passes through the Fenton fluidized bed reactors connected in series, the single-stage retention time is 12-14h, and organic pollutants in the wastewater are oxidized into CO by hydroxyl radicals under the combined action of oxidation and catalytic agents 2 And H 2 And O, finishing the degradation and mineralization process of the organic pollutants. The water produced by the third-stage Fenton fluidized bed reaction kettle 12 enters a built-in ceramic microfiltration membrane tank 14, and a built-in ceramic microfiltration membrane component is arranged in the tank to replace the traditional sedimentation tank to trap chemical sludge generated by reaction, so that the concentration of suspended matters in the effluent is reduced.
The water produced by the Fenton-like catalytic oxidation system 3 firstly enters an acid-base adjusting tank A16 in a membrane deamination system 4 through the self-priming pump action, the pH of the wastewater is adjusted to 9.5-10.0 by adding a strong base medicament, and then the wastewater enters a core membrane component 19 through a deamination water inlet pump 17 and a cartridge filter 18, wherein the core membrane component adopts hollow fiber hydrophobic membrane filaments, the material is PVDF or PTEF, and the total membrane area is 68m 2 Single-stage operation with the operation pressure of 1.0-1.2 Mpa; the strong acid absorption adopts concentrated sulfuric acid with the concentration of 98 percent, the pH value of the deamination side is maintained at about 9-10, the initial pH value of the suction side is maintained at about 0.2, and the final pH value is maintained at about 2.0. After the reaction at the drawing side is finished, the ammonium salt solution is collected by an ammonium salt recovery system 5 and then flows back to a main process MBR denitrification tank in a fixed time and fixed quantity manner to be treated by secondary treatmentAnd (6) processing.
The water produced by the membrane deamination system 4 enters a low-temperature MVR evaporation system 6 through a water outlet pump 21 for salt separation treatment, an MVR main evaporator is made of a titanium material, the reaction temperature is 90 ℃, and the concentration multiple is 4-5 times. The solid phase remained by evaporation is a mixed salt mixture, the gas phase generated by evaporation is treated by a condensing system to be system produced water, and the system produced water enters a water producing pool 7 to complete the full-scale harmless treatment process of the landfill leachate membrane concentrated solution, and the removal effect of each unit is shown as the following table:
table 2: water quality condition of membrane concentrated solution pool of leachate treatment station of certain domestic garbage landfill in Guangshui City of Hubei province
As can be seen from the above table, in the embodiment, when the garbage leachate membrane concentrated solution full-scale harmless zero-emission treatment system is used for treating the corresponding membrane concentrated solution, the produced water can reach the water quality of the standard of recycled cooling water reclaimed water quality standard (HG/T3923-2007), the water production rate is greater than 95%, no secondary pollutant is generated and transferred, the whole system is efficient, energy-saving and environment-friendly.
The invention utilizes the physical and chemical cooperative treatment process to truly realize the resource treatment of the membrane concentrated solution, but not the traditional concentration-transfer treatment, thereby avoiding the problem of secondary environmental pollution caused by the recharging, back spraying, back filling and the like of the membrane concentrated solution; the membrane concentrated solution treatment process disclosed by the invention is reasonable in combination, safe, stable and efficient; in addition, although the number of units of the membrane concentrated solution treatment process is increased compared with the traditional membrane concentrated solution treatment process, the whole operation cost is basically kept equal, the problem of secondary pollutant treatment is avoided, and the method has obvious economic and social benefits.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; the present invention may be readily implemented by those of ordinary skill in the art as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (6)
1. The membrane concentrate harmless treatment system is characterized by comprising a membrane concentrate storage tank (1), a pretreatment reaction tank (2), a Fenton-like catalytic oxidation system (3), a membrane deamination system (4), an ammonium salt recovery system (5), a low-temperature MVR evaporation system (6) and a water production tank (7), wherein the membrane concentrate storage tank (1), the pretreatment reaction tank (2), the Fenton-like catalytic oxidation system (3), the membrane deamination system (4), the low-temperature MVR evaporation system (6) and the water production tank (7) are sequentially communicated, and meanwhile, the ammonium salt recovery system (5) is communicated with branch lines on the membrane deamination system (4); the Fenton-like catalytic oxidation system (3) comprises a water pump (8), a security filter (9), a first-stage Fenton fluidized bed reaction kettle (10), a second-stage Fenton fluidized bed reaction kettle (11), a third-stage Fenton fluidized bed reaction kettle (12), a built-in ceramic microfiltration membrane assembly (15) and an air blower which are sequentially communicated, wherein the air blower is connected with the bottoms of the first-stage Fenton fluidized bed reaction kettle (10), the second-stage Fenton fluidized bed reaction kettle (11), the third-stage Fenton fluidized bed reaction kettle (12) and the built-in ceramic microfiltration membrane assembly (15) through pipelines, and the water pump (8) is communicated with the first-stage Fenton fluidized bed reaction kettle (10) through the security filter (9).
2. The membrane concentrate innocent treatment system according to claim 1, wherein the primary Fenton fluidized bed reactor (10), the secondary Fenton fluidized bed reactor (11) and the tertiary Fenton fluidized bed reactor (12) are all provided with Fenton-like supported solid catalyst packing (13) and filled with the Fenton-like supported solid catalyst packing, and the high-frequency ultrasonic generator (14) is arranged on the outer walls of the primary Fenton fluidized bed reactor (10), the secondary Fenton fluidized bed reactor (11) and the tertiary Fenton fluidized bed reactor (12).
3. The membrane concentrate innocent treatment system according to claim 1, wherein the membrane deamination system (4) comprises an acid-base regulation tank A (16), a water inlet pump (17), a cartridge filter (18), an integrated degassing membrane assembly (19), an acid-base regulation tank B (20) and a system water outlet pump (21) which are sequentially communicated.
4. A membrane concentrate non-hazardous zero-emission treatment process, carried out based on the membrane concentrate non-hazardous treatment system of any one of claims 1 to 3, comprising the steps of:
(1) Pretreatment: the method mainly comprises the steps of pre-aerating, pre-coagulating and precipitating a stock solution in a membrane concentrated solution storage tank, removing suspended matters, calcium and magnesium ions and impurities in the membrane concentrated solution, and adjusting an acid-base buffer system through aeration;
(2) Fenton-like catalytic oxidation: the organic pollutants in the pretreated membrane concentrated solution are mineralized and degraded mainly through a multi-stage Fenton-like catalytic oxidation reaction system, and the product is CO 2 ，H 2 O and NH 4 + (ii) a The reactor uses an upflow Fenton fluidized bed reaction kettle;
(3) Membrane deamination treatment: separating and converting residual ammonia nitrogen pollutants in the membrane concentrated solution after catalytic oxidation into ammonia gas by mainly combining a hydrophobic hollow fiber membrane and an acid-base potential difference, absorbing the ammonia gas by using strong acid, and performing secondary utilization;
(4) MVR low-temperature evaporation: the membrane concentrated solution after deamination is subjected to salt separation treatment by a vacuum low-temperature evaporation system, the water vapor part is condensed to form water by the whole process, and the residual part is miscellaneous salt, so that the requirement of the water produced by the system on the salt content is met.
5. The membrane concentrate harmless zero emission treatment method of claim 4, wherein the Fenton-like catalytic oxidation treatment further comprises the step of reducing the concentration of suspended substances in the produced water to a value acceptable to a subsequent treatment unit by using an internal ceramic microfiltration membrane module (15) to replace the function of a traditional Fenton reaction secondary sedimentation tank.
6. The membrane concentrate harmless zero emission treatment method according to claim 4, wherein the chemical sludge generated by the Fenton-like catalytic oxidation treatment is transported to a sludge concentration tank of the main process system and treated in a combined manner.
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