CN212833299U - Modularized long-term treatment device for excrement wastewater of toilet wastewater collector of railway train - Google Patents
Modularized long-term treatment device for excrement wastewater of toilet wastewater collector of railway train Download PDFInfo
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- CN212833299U CN212833299U CN202021150968.XU CN202021150968U CN212833299U CN 212833299 U CN212833299 U CN 212833299U CN 202021150968 U CN202021150968 U CN 202021150968U CN 212833299 U CN212833299 U CN 212833299U
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Abstract
The utility model provides a modular remote treatment device for fecal wastewater of a toilet of a railway train, which comprises a pretreatment system, a nitrogen and phosphorus removal system and an advanced treatment system, wherein the pretreatment system comprises a first spiral shell stacking dehydrator and an air floatation machine, and liquid separated from the air floatation machine enters the nitrogen and phosphorus removal system for treatment; the nitrogen and phosphorus removal system comprises a short-cut nitrification and denitrification module, an anaerobic ammonia oxidation tank and a synchronous nitrification and denitrification module which are arranged in sequence, the short-cut nitrification and denitrification module comprises a denitrification tank, a nitrosation tank and a first sedimentation tank which are arranged in sequence, and the synchronous nitrification and denitrification module comprises a membrane biological filter and a second sedimentation tank which are arranged in sequence; the liquid in the second sedimentation tank enters an advanced treatment system for treatment; the advanced treatment system comprises an MABR and an advanced oxidation reactor in sequence. The utility model discloses a high-efficient denitrogenation is realized to the combination of multimode and multistage reaction tank, and the running cost reduces 50% than prior art.
Description
Technical Field
The utility model relates to a modularization railway train excrement and urine effluent treatment plant of excrement and urine collector belongs to railway train sewage treatment field.
Background
With the rapid development of the social economy and the accelerated advancement of urbanization in China, domestic high-speed railway trains (high-speed railway trains, hereinafter referred to as high-speed rails) are rapidly developed. It is reported that in 2008, the total mileage of high-speed rail in China is 672 kilometers and less than 1% of the total operating mileage of the railway, and in 2015, the total operating mileage of high-speed rail in China reaches 1.9 kilometers and accounts for 15.7% of the total operating mileage of the railway. It follows that high-speed rail construction is developing very rapidly.
The rapid development of high-speed rails brings rapid and convenient traffic to people, shortens the travel time of people, makes people more comfortable and convenient to travel, and brings some problems at the same time. In the past, the railway train toilets in China are all in a direct discharge mode, but with the increasing strength of comprehensive national power in China, the environment protection industry is more and more emphasized by the nation, people have higher and higher requirements on the environment, and the excrement collectors are all used for collecting passenger excrement sewage since the high-speed opening. With the rapid development of high-speed railways, the amount of high-speed railway excrement sewage is also rapidly increased, and according to the regulations of health departments, the sewage of the excrement collector of the high-speed railway train (hereinafter referred to as the sewage of the excrement collector of the high-speed railway) cannot be directly discharged along the line and must be collected and then treated in a centralized manner. Therefore, how to treat the high-speed rail fecal sewage economically and effectively is urgent.
The train toilet wastewater has the characteristics of high organic matter, high suspended matter, high ammonia nitrogen, high phosphorus, low carbon-nitrogen ratio and the like, namely four high and one low, and simultaneously has the advantages of high chroma, high biotoxicity and high treatment difficulty due to the fact that the wastewater contains various inhibiting substances, so that the wastewater becomes the key point for treating the wastewater in the railway industry.
At present, the sewage of the train toilet wastewater collector is collected and then enters a multi-grid septic tank, and after anaerobic treatment for several months, the sewage is discharged into a municipal pipe network or is treated with other sewage generated by a high-speed railway station in a unified way.
Patent CN201611101840 provides a system and a method for centralized treatment of sewage of a toilet bowl of a high-speed railway carriage. Firstly, a rotary roller grid is used for removing toilet paper and large excrement in the sewage of the excrement collector; setting a pretreatment regulating tank and adding bleaching powder for removing part of ammonia nitrogen and suspended matters in the sewage and regulating the water quality and the water quantity; an internal circulation micro-aerobic reactor is arranged to receive 2/3 waste water of the excrement collector, 100-150 meshes of micro-electrolysis catalytic carrier particles are added, and the sewage treatment can be realized through granular sludgeShort-cut nitrification; an internal circulation anaerobic reactor is utilized to realize the removal of partial ammonia nitrogen and nitrate nitrogen; a dual-circulation aerobic reactor is arranged to realize synchronous nitrification and denitrification of aerobic granular sludge; a special-effect denitrification aeration filter is arranged, and the deep treatment of sewage is realized by utilizing the action of a micro-electrolysis catalytic biological carrier; treating the water with chlorine dioxide (ClO)2) And (4) performing disinfection treatment to realize standard emission.
The three steps of synchronous shortcut nitrification and denitrification, anaerobic ammonia oxidation and synchronous nitrification and denitrification in the patent are realized by a single reactor, specifically, the three steps are respectively carried out in an internal circulation micro-aerobic reactor 3, an internal circulation anaerobic reactor 4 and a dual circulation aerobic reactor 5, so that the sewage treatment system is difficult to realize high-efficiency denitrification. Meanwhile, 100-150 meshes of micro-electrolysis catalytic carrier particles are required to be added into the internal circulation micro-aerobic reactor 3, the internal circulation anaerobic reactor 4 and the dual-circulation aerobic reactor 5 of the sewage treatment system, and the operation cost of the system is high.
Chinese patent CN200910092443 relates to a method for centralized treatment of excrement, which comprises the following steps: the method comprises the following steps of solid-liquid separation, flocculation dehydration, aerobic composting, anaerobic treatment of sewage, facultative aerobic treatment of sewage, membrane bioreaction treatment of sewage and odor treatment, and by the steps, 100% harmlessness, 99.7% reduction and 100% recycling of excrement and mud of the city are realized. In this patent, the anaerobic sludge in the anaerobic treatment step, the facultative sludge in the facultative treatment step, and the aerobic sludge in the aerobic treatment step of the sewage are all returned to the dehydration step. The excrement centralized treatment method in the patent requires sludge return, and the sewage in the patent also needs anaerobic treatment before the denitrification step. The efficiency and cost of this treatment scheme is high.
Therefore, a new method and a new device for treating the waste water of the excrement of the railway train excrement collector are needed in the field.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that internal high-speed railway train rapid development, high-speed railway excrement collector sewage need urgently to be solved, provide a modularization railway train excrement and urine effluent treatment plant and method of excrement and urine collector sewage, can handle excrement and urine collector sewage effectively, reduce sewage and emit into the impact of the small-size sewage treatment plant operating stability of centering.
In order to solve the technical problem, the technical scheme of the utility model as follows:
therefore, the utility model discloses at first provide a modularization railway train excrement and urine waste water long-term treatment device of excrement and urine collection ware, the device includes pretreatment systems, nitrogen and phosphorus removal system and the advanced treatment system that sets gradually in the waste water flow direction, pretreatment systems includes first spiral shell of folding hydroextractor and the air supporting machine that sets gradually in the waste water flow direction, and the liquid that separates in the air supporting machine gets into in the nitrogen and phosphorus removal system handles; the nitrogen and phosphorus removal system comprises a short-cut nitrification and denitrification module, an anaerobic ammonia oxidation tank and a synchronous nitrification and denitrification module which are sequentially arranged in the flow direction of wastewater, the short-cut nitrification and denitrification module comprises a denitrification tank, a nitrosation tank and a first sedimentation tank which are sequentially arranged in the flow direction of wastewater, and the synchronous nitrification and denitrification module comprises a membrane biological filter and a second sedimentation tank which are sequentially arranged in the flow direction of wastewater; the liquid in the second sedimentation tank enters the advanced treatment system for treatment; the advanced treatment system comprises an MABR (membrane aeration biofilm reactor) and an advanced oxidation reactor, wherein the MABR is used for further denitrifying wastewater, and the advanced oxidation reactor is used for decoloring and disinfecting the wastewater, and the MABR is the membrane aeration biofilm reactor.
In a specific embodiment, the device further comprises a sludge treatment system (4), and the sludge treatment system comprises a sludge deposition pool (4.1) and a second screw-stacked dewaterer (4.2) which are arranged in sequence in the flow direction of the wastewater; and the solid separated from the air flotation machine (1.2), the sludge in the nitrogen and phosphorus removal system (2) and the sludge in the MABR (3.1) are all sent into the sludge sedimentation tank (4.1).
In a particular embodiment, the apparatus further comprises a return conduit for waste water from the nitritation tank (2.12) to the denitrification tank (2.11).
In a particular embodiment, the apparatus further comprises a first cross-over conduit for return of wastewater from the outlet of the first sedimentation tank (2.13) to the denitrification tank (2.11).
In a particular embodiment, the apparatus further comprises a second cross-over conduit for wastewater flowing directly from the outlet of the first sedimentation tank (2.13) to the membrane biofilter (2.31).
In a particular embodiment, the apparatus further comprises a second cross-over conduit for wastewater flowing directly from the outlet of the first sedimentation tank (2.13) to the membrane biofilter (2.31).
The utility model also provides a modularization railway train excrement and urine waste water long-term treatment method, the method includes using one kind as above processing apparatus, processing method includes following step:
step A, pretreatment step: removing a large amount of solid particles in the wastewater through a pretreatment system comprising a first spiral shell-stacking dehydrator and an air floatation machine, and removing partial organic matters, nitrogen and phosphorus by combining with adding of a medicament to reduce the chroma; liquid in the first screw-stacking dehydrator enters an air flotation machine, and solid obtained by separation in the first screw-stacking dehydrator is transported and discharged; the solid obtained by separation in the air flotation machine enters a sludge sedimentation tank (4.1), and the liquid obtained by separation in the air flotation machine enters a denitrification tank (2.11);
b, nitrogen and phosphorus removal: the pretreated wastewater enters a denitrification and dephosphorization system, the wastewater sequentially passes through a denitrification tank (2.11), a nitrosation tank (2.12), a first sedimentation tank (2.13), an anaerobic ammonia oxidation tank (2.2), a membrane biological filter (2.31) and a second sedimentation tank (2.32), and water discharged from the second sedimentation tank (2.32) enters a step C for advanced treatment; the sludge generated in the nitrogen and phosphorus removal system enters the sludge sedimentation tank (4.1);
step C, deep treatment step: wastewater flowing in from the second sedimentation tank is subjected to deep denitrification by an MABR (membrane aeration biofilm reactor), wastewater flowing out of the MABR enters a high-grade oxidation reactor for decolorization and disinfection, sludge generated in the MABR is also fed into the sludge sedimentation tank, and the wastewater discharged after being treated by the deep treatment system (3) can be directly used;
step D, sludge treatment: supernatant in the sludge deposition pool (4.1) returns to the nitrogen and phosphorus removal system (2) for retreatment, slurry in the sludge deposition pool (4.1) is pumped to the second spiral dehydrator (4.2) for solid-liquid separation, the solid obtained by separation is transported and discharged, and the liquid obtained by separation also returns to the nitrogen and phosphorus removal system (2) for retreatment.
In a specific embodiment, an intensified oxidative coagulation decolorizing agent is added into the air floatation machine, and the intensified oxidative coagulation decolorizing agent comprises polyaluminium chloride and/or polyacrylamide.
In a specific embodiment, a phosphorus removal agent is added into the second sedimentation tank (2.32) to remove phosphorus from the wastewater, and the phosphorus removal agent is one or more of lime, iron salt and aluminum salt.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1) after the wastewater is pretreated, biologically denitrified and dephosphorized and deeply treated, the effluent meets the requirements of urban greening and vehicle washing water quality in the standard of urban wastewater recycling urban miscellaneous water quality (GB/T18920-2002). The removal rate of COD in the wastewater is more than 98.6 percent, and the removal rates of SS, ammonia nitrogen and TN can reach more than 99 percent.
2) The utility model discloses an adopt all kinds of quantity that are favorable to the microorganism and the technological combination of kind increase among the nitrogen and phosphorus removal system, improve the utility model discloses microorganism quantity under the scheme, waste water treatment is high-efficient swift. And the floor area is only half of that of the traditional method by matching with the high integration of integrated equipment and the optimized design of buildings, so that the problem of insufficient space is solved.
3) Each process unit is in modular design, and a through pipeline is arranged between the process units, so that the process units can be flexibly combined according to the actual operation condition, the effluent is guaranteed to reach the standard, and the operation cost is saved. When the nitrogen content of the inlet water in the anaerobic ammonia oxidation tank 2.2 does not reach the standard, the first through pipeline is used for carrying out denitrification treatment on the wastewater by the shortcut nitrification and denitrification module 2.1 again. When the inflow water of the anaerobic ammonia oxidation tank 2.2 reaches the inflow water standard of the membrane biological filter 2.31, the anaerobic ammonia oxidation step is not needed, and the wastewater in the first sedimentation tank 2.13 is directly sent into the membrane biological filter 2.31 by using a second crossing pipeline. Equipment height integrated among the processing apparatus sets up first and second and passes through the pipeline, can make up in a flexible way and adjust the waste water route according to quality of water and play water standard.
In general, compare with prior art, the utility model discloses a denitrification is nitrified to short cut is successively realized through denitrification pond 2.11, nitrosation pond 2.12 and the combination of these three of first sedimentation tank 2.13, and the utility model provides a denitrification is nitrified in step is then realized successively through the combination of membrane biological filter 2.31 and second sedimentation tank 2.32. Therefore, in the device of the utility model, after the sludge is added for the first time, the bacteria can be added, and the medicament or the bacteria are not needed to be added in the follow-up operation process, so that the operation cost of the device is low. The utility model discloses when the device founds and add the bacterial with the operation for the first time, all add in denitrification pond 2.11, nitrosation pond 2.12, membrane biological filter 2.31 and the MABR come from sewage treatment plant corresponding ordinary mud can, and anaerobic ammonium oxidation bacterium need be added in the anaerobic ammonium oxidation pond 2.2. The utility model discloses a high-efficient denitrogenation is realized to the combination of multimode and multistage reaction tank, and the running cost reduces 50% than prior art.
Drawings
FIG. 1 is a schematic structural view of a remote treatment device for excrement wastewater of a modular toilet on a railway train.
FIG. 2 is a conventional biological denitrification pathway.
FIG. 3 shows a shortcut nitrification-denitrification biological denitrification process.
FIG. 4 is an anammox denitrification pathway.
Reference numerals: the device comprises a pretreatment system 1, a first spiral shell-overlapping dehydrator 1.1, an air flotation machine 1.2, a nitrogen and phosphorus removal system 2, a short-cut nitrification and denitrification module 2.1, a denitrification tank 2.11, a nitrosation tank 2.12, a first sedimentation tank 2.13, an anaerobic ammonia oxidation tank 2.2, a synchronous nitrification and denitrification module 2.3, a membrane biological filter 2.31, a second sedimentation tank 2.32, an advanced treatment system 3, an MABR3.1, a high-level oxidation reactor 3.2, a sludge treatment system 4, a sludge sedimentation tank 4.1 and a second spiral shell-overlapping dehydrator 4.2.
Detailed Description
The present invention will be described in detail with reference to examples. It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The utility model discloses the liquid of the thick form in the first spiral shell hydroextractor 1.1 that folds gets into the air supporting machine, and the solid of separation is outward transported in the first spiral shell hydroextractor 1.1 that folds.
The utility model discloses in, generally need add PAC (coagulant) and/or PAM (flocculating agent) in air supporting machine 1.2, just itself contains coagulating basin and flocculation basin in the air supporting machine, adds PAC or PAM sometimes and can reach ideal effect.
The utility model discloses in, generally be provided with the waste water return channel who returns denitrification pond 2.11 among the nitrosation pond 2.12, can adjust from nitrosation pond 2.12 to denitrification pond 2.11's reflux ratio through the actual processing condition of waste water.
The utility model discloses in, when the waste water treatment plant is found at first, the mud that all uses ordinary municipal sewage treatment plant in denitrification pond 2.11, nitrosation pond 2.12, membrane biological filter 2.31 and MABR3.1 is the bacterial, uses the same mud when the component fungus crowd in different ponds promptly, and the culture environment that only each pond is different makes this pond divide into the denitrification pond under normal running state, nitrosation pond, or other condition. In addition, in the present invention, anammox bacteria used when initially constructing a wastewater treatment apparatus can be purchased from, for example, colleges and universities or scientific research institutes.
The utility model discloses in, anaerobic ammonium oxidation pond 2.2 requires highly to the content of total suspended solid SS, and the SS content is then unsuitable anaerobic ammonium oxidation fungus (red fungus) growth. The utility model discloses set up first sedimentation tank 2.13 behind nitrosation pond 2.12 for the waste liquid that gets into anammox pond 2.2 can carry out anammox denitrogenation reaction smoothly.
The utility model discloses in, the biofilm formation among the membrane biological filter 2.31 can the up-and-down motion, and when the biofilm formation upwards left the surface of water and arrange the air in, it is mainly that good oxygen fungus plays, mainly takes place nitration, and the biofilm formation is then mainly heterotrophic bacterium play in the downward immersion water, mainly takes place denitrification. The membrane biological filter 2.31 generally has no complete anaerobic state, but has alternating facultative zone and aerobic zone states.
In the utility model, the dephosphorizing agent is generally added into the second sedimentation tank 2.32. If the phosphorus content in the effluent of the membrane biological filter 2.31 reaches the standard, the second sedimentation tank 2.32 does not need to be added with a dephosphorizing agent. The phosphorus removing agent is one or more of lime, iron salt and aluminum salt. The consumption of the phosphorus removal agent required by chemical phosphorus removal is related to the phosphorus content of the required effluent, and when the phosphorus content of the effluent is required to be less than or equal to 1.0mg/L, 1.7kg of iron or 0.8kg of aluminum is required to be added for removing 1kg of phosphorus. The amount of metal salt added is generally determined experimentally for a particular wastewater. The concentration of the TP of the inlet water is different from the expected phosphorus removal rate, and the corresponding phosphorus removal agent dosage is also different.
In the utility model, the oxygen supply mechanism of the membrane biological filter 2.31 is different from that of the MABR 3.1. The biofilm culturing in the membrane biofilter mainly utilizes oxygen in the air, and different reactions, namely nitrification and denitrification, occur in the same membrane biofilter at two different time points or time periods when the biofilm culturing is soaked in wastewater or exposed in the air. The oxygen on the MABR can penetrate through the membrane material, and different reactions, namely nitrification and denitrification, occur at different positions on the same MABR. In addition, the efficiency of the MABR is higher than that of the membrane biofilter. In the utility model discloses in, the mud that produces in the MABR3.1 also can send into in the sludge deposition pond 4.1, but MABR production mud volume is very little, so does not mark in the picture.
The advanced oxidation reactor 3.2 used in the utility model can be a micro-nano bubble generating device which is directly purchased and is also called a micro-nano aeration device; the reactor provides nano-scale or micro-scale ozone or oxygen for wastewater. Furthermore, no sludge is produced in the advanced oxidation reactor 3.2.
The utility model discloses in, can throw PAC or PAM in sludge deposition pond 4.1 or its low reaches pipeline to increase and coagulate and flocculate. The sludge sedimentation tank 4.1 mainly plays a role in sludge concentration and collection, wherein a rough solid-liquid separation effect between sludge and wastewater can be generated, and the supernatant in the sludge sedimentation tank 4.1 is generally returned to the nitrogen and phosphorus removal system 2 for treatment. The primary purpose of the second stack screw dewaterer 4.2 is to reduce the moisture content of the sludge so that the sludge from the sludge settling tank 4.1 becomes or approaches solid sludge, which typically contains around 80 wt% moisture in the transported out dry solid sludge. The utility model discloses in, the liquid that separates in the second folds spiral shell hydroextractor 4.2 also returns nitrogen and phosphorus removal system 2.
The conventional biological denitrification, shortcut nitrification and denitrification biological denitrification and anaerobic ammonia oxidation denitrification in fig. 2 to 4 of the present invention are the prior art well known to those skilled in the art. Further, denitrification occurring in the denitrification tank 2.11, nitrosation occurring in the nitrosation tank 2.12, anammox occurring in the anammox tank, simultaneous nitrification and denitrification occurring in the membrane biofilter, and deep denitrification occurring in the MABR are also known to those skilled in the art. The utility model discloses an innovation lies in combining each unit module with certain order and technology, forms device and method to train excrement collector waste water high efficiency and low-cost processing. In addition, the spiral shell hydroextractor, air supporting machine, membrane biological filter, MABR and advanced oxidation reactor that relate to in the utility model all can obtain through the commercial purchase, do not relate to the innovation to these equipment and details thereof in the utility model.
Example 1
Taking a certain high-speed rail station collection and distribution center in Yunnan Kunming as an example, as the high-speed rail station collection and distribution center is a key traffic hub, a plurality of station trains exist, and the high-speed rail excrement collector wastewater has higher concentration and large water quantity. The waste water of the excrement collector is pumped by a vacuum pumping system and then is placed in a septic tank, the COD of the waste water of the septic tank is 5800mg/L, the SS is 2650mg/L, the ammonia nitrogen is 1500mg/L, the total nitrogen is 1800mg/L, and the total phosphorus is 200 mg/L. The treated wastewater meets the requirements of urban greening and vehicle washing water quality in the standards of urban wastewater recycling urban miscellaneous water quality (GB/T18920-2002).
As shown in figure 1, the sewage passes through a pretreatment system → a nitrogen and phosphorus removal system → an advanced treatment system, and the sludge generated in the sewage treatment process enters a sludge treatment system, which comprises the following treatment steps:
a medicament configuration; respectively preparing 25% polyaluminium chloride and 0.2% polyacrylamide solution for later use;
step A: and (5) preprocessing by a system. The effluent of the septic tank is firstly subjected to solid-liquid separation by overlapping, the liquid enters a dissolved air flotation machine, 300mg/L of polyaluminium chloride and 5mg/L of polyacrylamide are added, and part of SS, organic matters and TP are further removed under the actions of coagulation, oxidation and air flotation. The solid after solid-liquid separation and sludge generated in the sewage treatment process are dewatered and then transported to outside for disposal.
After pretreatment, SS in the sewage is reduced to 234mg/L, the removal rate reaches 91.2%, and the removal rate of COD is more than 80%.
And B: a nitrogen and phosphorus removal system. After two-stage solid-liquid separation in a pretreatment system, the content of suspended matters is greatly reduced, most of COD, partial ammonia nitrogen and TP in wastewater are removed, dissolved air flotation effluent automatically flows into a preposed denitrification unit, the BOD and partial total nitrogen of the influent water are removed by utilizing granular sludge in a denitrification tank, and certain alkalinity is generated; then the sewage enters a high-efficiency nitrosification unit, and partial nitrosification of ammonia nitrogen is realized by using the sludge in the nitrosification pool; part of sewage with the proportion of ammonia nitrogen and nitrite nitrogen controlled within the proportion range required by anaerobic ammonia oxidation after nitrosation enters an anaerobic ammonia oxidation tank after SS is removed by precipitation in a first precipitation tank, and ammonia nitrogen and TN are removed; and after the anaerobic ammonia oxidation treatment, the sewage enters a membrane biological filter for synchronous nitrification and denitrification for further denitrification, and meanwhile, chemical phosphorus removal is carried out by adding a phosphorus removal agent into a second rear sedimentation tank. The phosphorus removing agent is aluminum salt polyaluminium chloride, and the dosage of the experimental medicament is 90 mg/L.
After passing through the nitrogen and phosphorus removal system, COD in the sewage is 213mg/L, ammonia nitrogen is 22mg/L, total nitrogen is 56mg/L, and total phosphorus is 8 mg/L. The COD removal rate of the nitrogen and phosphorus removal system is 85%, the COD removal rate after passing through the pretreatment system and the nitrogen and phosphorus removal system reaches 96.3%, the ammonia nitrogen and total nitrogen removal rate reaches more than 95%, specifically 98.5% and 96.9%, respectively, and the TP removal rate reaches 96%.
And C, deeply processing the system. In particular to the deep denitrification of MABR and the decoloration and disinfection of an advanced oxidation reactor.
And the effluent treated by the nitrogen and phosphorus removal system enters an MABR integrated device for deep nitrogen removal. Using MABR Special aerationMode and oxygen transmission mechanism, the microbial film can generate an obvious layered structure, and the microbial film can be roughly divided into 3 basic functional layers, namely an aerobic layer and a facultative layer which are close to the film and an anaerobic layer which is contacted with a bulk solution, so that the MABR has the capability of synchronous nitrification and denitrification. The aeration power efficiency of the MABR technology can reach 14kgO2the/kWh is 3-4 times of that of the traditional aeration mode, and accordingly, the aeration power consumption can be saved by about 75%.
After the advanced denitrification of the MABR integrated equipment, the contents of ammonia nitrogen and TN in the sewage are 6mg/L and 21mg/L, the removal rates of pollutants reach more than 60%, and the removal rates of ammonia nitrogen and TN in the step are 72.7% and 62.5% respectively.
The tail end of the system is provided with an advanced oxidation reactor for decoloring and sterilizing, and particularly adopts a micro-nano generating device of ozone or oxygen, so that ozone or oxygen bubbles entering the sewage reach a nano level, the dissolving concentration in the sewage is improved, the contact probability with the sewage is increased, and the gas mass transfer coefficient and the sewage treatment efficiency are improved. After the wastewater is subjected to advanced oxidation, the pollutants such as the chromaticity, COD and the like of the wastewater are further reduced, and the urban greening and vehicle washing standards of urban wastewater recycling urban miscellaneous water quality (GB/T18920-2002) are met.
The utility model discloses specifically in step A preliminary treatment step, adopt evacuation system after train excrement collector collects sewage, collect excrement collector sewage suction septic tank, later get into pretreatment system's first spiral shell hydroextractor that folds, utilize to fold spiral shell hydroextractor and get rid of solid rubbish and particulate matter such as paper handkerchief, through the liquid that folds spiral shell hydroextractor solid-liquid separation, get into and dissolve gas air supporting machine, through throwing add intensive oxidation coagulation decoloration medicament, further get rid of partial SS (total solid suspended solid), organic matter, TP under the effect of coagulating, oxidation, air supporting. The load of a subsequent biochemical system is reduced through two-stage reinforced coagulation filtration of 'stack screw and air flotation', and the stable operation of the biochemical system is ensured.
The utility model discloses specifically in step B nitrogen and phosphorus removal step, through reasonable technology combination, realize the partial accumulation of nitrite nitrogen, with the proportional control of nitrite nitrogen and ammonia nitrogen at optimal reaction ratio, with basicity, free ammonia control at the optimum level, realize the high-efficient denitrogenation under the high nitrogen, low carbon nitrogen ratio condition. In the step B, particularly, after two-stage solid-liquid separation of the pretreatment step, the content of suspended matters is greatly reduced, most of COD, partial ammonia nitrogen and TP in the wastewater are removed, the effluent of the dissolved air floatation machine automatically flows into a preposed denitrification tank, the BOD and partial total nitrogen of the influent are removed by utilizing granular sludge, and a certain alkalinity is generated; then the ammonia nitrogen enters a high-efficiency nitrosification pool to realize nitrosification of the ammonia nitrogen part; part of sewage with the proportion of ammonia nitrogen and nitrite nitrogen controlled within the proportion range required by anaerobic ammonia oxidation after nitrosation enters an anaerobic ammonia oxidation tank after SS is removed in a first sedimentation tank, and ammonia nitrogen and TN are removed; and after the anaerobic ammonia oxidation treatment, the sewage enters a membrane biological filter for synchronous nitrification and denitrification for further denitrification, and meanwhile, chemical phosphorus removal is carried out by adding a phosphorus removal agent into a second rear sedimentation tank.
The utility model discloses in, step B's nitrogen and phosphorus removal system is combined together for the denitrification module is nitrified to the short distance + anaerobic ammonium oxidation pond + denitrification module is nitrified in step B, and all through many ponds combination in the denitrification module is nitrified to the short distance and the denitrification module is nitrified in step B, realizes the high-efficient denitrogenation under the high nitrogenous, low carbon nitrogen ratio condition.
The utility model discloses in, after the advanced treatment of advanced treatment system 3 in step C, further reduced play water TN, COD, colourity for it has reached higher processing requirement to go out water.
And the advanced treatment system in the step C is MABR (membrane aeration biofilm reactor) advanced denitrification and advanced oxidation reactor decoloration and disinfection. The tail end of the system is provided with an advanced oxidation reactor, so that the pollution indexes such as chroma, COD and the like in the sewage are further reduced. In the step C, by utilizing a special aeration mode and an oxygen transfer mechanism of the MABR, the microbial film can generate an obvious layered structure and can be roughly divided into 3 basic functional layers, namely an aerobic layer and a facultative layer which are close to the film and an anaerobic layer which is contacted with the bulk solution, so that the MABR has the capability of synchronous nitrification and denitrification. The aeration power efficiency of the MABR technology can reach 14kgO2the/kWh is 3-4 times of that of the traditional aeration mode, and accordingly, the aeration power consumption can be saved by about 75%. The utility model discloses set up advanced treatment system MABR degree of depth denitrogenation + advanced oxidation reactor decoloration disinfection, canSo as to further remove nitrogen and phosphorus and reduce organic matters and chroma in the wastewater.
The utility model discloses study out to the most suitable pretreatment systems of high-speed railway waste water: and (3) the spiral shell overlapping dehydrator and the air floatation machine are used for removing most of solid suspended matters and carrying out coagulating sedimentation pretreatment before denitrification treatment.
Biological nitrogen removal is waste water treatment's key difficult point, the utility model discloses a biological nitrogen removal technology who is the owner with anaerobic ammonia oxidation, denitrification and synchronous nitrification denitrification are nitrified to the short cut in coordination, and specifically through leading denitrification tank, reduce BOD and ammonia nitrogen load, realize stable nitrosation in nitrosation pond immediately, with ammonia nitrogen nitrite nitrogen control taking place the required 1 of anaerobic ammonia oxidation: 1; then the anaerobic ammonia oxidation realizes high-efficiency denitrification. Then, two groups of filter curtains which are symmetrically staggered and densely distributed are adopted in the membrane biological filter (also called a biological membrane pool), and an alternating and facultative aerobic zone and an aerobic zone are formed on the surfaces of the filter curtains to realize synchronous nitrification and denitrification, so that the sewage is purified. The utility model discloses need not carry out the mud backward flow in the whole nitrogen and phosphorus removal system 2, need not add any bacterial or catalyst after the device founds, its operation energy consumption is low.
The foregoing is a more detailed description of the invention, taken in conjunction with the specific preferred embodiments, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions and replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (6)
1. A modularized long-term treatment device for excrement wastewater of a toilet bowl of a railway train is characterized by comprising a pretreatment system (1), a nitrogen and phosphorus removal system (2) and an advanced treatment system (3) which are sequentially arranged in the wastewater flow direction, wherein the pretreatment system comprises a first spiral-stacking dehydrator (1.1) and an air flotation machine (1.2) which are sequentially arranged in the wastewater flow direction, and liquid separated from the air flotation machine (1.2) enters the nitrogen and phosphorus removal system (2) for treatment; the nitrogen and phosphorus removal system comprises a short-cut nitrification and denitrification module (2.1), an anaerobic ammonia oxidation tank (2.2) and a synchronous nitrification and denitrification module (2.3) which are arranged in sequence in the flow direction of wastewater, the short-cut nitrification and denitrification module comprises a denitrification tank (2.11), a nitrosation tank (2.12) and a first sedimentation tank (2.13) which are arranged in sequence in the flow direction of wastewater, and the synchronous nitrification and denitrification module comprises a membrane biological filter (2.31) and a second sedimentation tank (2.32) which are arranged in sequence in the flow direction of wastewater; the liquid in the second sedimentation tank (2.32) enters the advanced treatment system (3) for treatment; the advanced treatment system (3) comprises an MABR (3.1) which is a membrane aeration biomembrane reactor and is used for further denitrifying the wastewater and an advanced oxidation reactor (3.2) which is used for decoloring and disinfecting the wastewater, wherein the MABR is arranged in sequence in the flow direction of the wastewater.
2. The apparatus according to claim 1, characterized in that the apparatus further comprises a sludge treatment system (4) and the sludge treatment system comprises a sludge deposition tank (4.1) and a second stack screw dehydrator (4.2) arranged in series in the wastewater flow direction; and the solid separated from the air flotation machine (1.2), the sludge in the nitrogen and phosphorus removal system (2) and the sludge in the MABR (3.1) are all sent into the sludge sedimentation tank (4.1).
3. The apparatus according to claim 1, characterized in that the apparatus further comprises a return conduit for waste water from the nitritation tank (2.12) back to the denitrification tank (2.11).
4. The apparatus according to any of the claims 1 to 3, characterized in that the apparatus further comprises a first traversing conduit for returning the waste water from the outlet of the first sedimentation tank (2.13) to the denitrification tank (2.11).
5. An apparatus according to claim 4, characterized in that the apparatus further comprises a second cross-over conduit for wastewater flowing from the outlet of the first sedimentation tank (2.13) directly to the membrane biofilter (2.31).
6. An apparatus according to any one of claims 1 to 3, further comprising a second cross-over conduit for wastewater flowing from the outlet of the first sedimentation tank (2.13) directly to the membrane biological filter (2.31).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115745299A (en) * | 2022-11-30 | 2023-03-07 | 中铁环境科技工程有限公司 | Excrement and sewage wastewater treatment device and using method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115745299A (en) * | 2022-11-30 | 2023-03-07 | 中铁环境科技工程有限公司 | Excrement and sewage wastewater treatment device and using method |
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