CN210340620U - Double-tank artificial rapid infiltration system for efficient denitrification of low C/N ratio sewage - Google Patents
Double-tank artificial rapid infiltration system for efficient denitrification of low C/N ratio sewage Download PDFInfo
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- CN210340620U CN210340620U CN201920885242.1U CN201920885242U CN210340620U CN 210340620 U CN210340620 U CN 210340620U CN 201920885242 U CN201920885242 U CN 201920885242U CN 210340620 U CN210340620 U CN 210340620U
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Abstract
The utility model discloses a two pond manual work fast infiltration systems that is used for high-efficient denitrogenation of low C/N ratio sewage, this system is including the case of intaking, the manual work fast infiltration layer pond is one, two and play water tanks in the manual work fast infiltration layer pond, magnetic field sets up in the manual work fast infiltration layer pond is one, the manual work fast infiltration layer pond is one to be inserted and is located two in the manual work fast infiltration layer pond, and its bottom and the manual work fast infiltration layer pond two-phase intercommunication, sewage passes through the water distribution district through the case of intaking in proper order, rubble district is one, filter material district is one, rubble district is two, the water catch area, rubble district is three, filter material district is two and rubble district is four, get into out. The system can realize integrated partial shortcut nitrification and anaerobic ammonia oxidation denitrification, and has the advantages of short start-up time, high denitrification efficiency, no production of residual sludge, low operation cost, simple, convenient and flexible operation, small occupied area, no secondary pollution and the like.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, concretely relates to two ponds manual work system of oozing soon that is used for low C/N ratio sewage high-efficient denitrogenation.
Background
The artificial rapid infiltration system is a novel sewage ecological treatment technology developed based on the traditional soil infiltration system, has obvious advantages in the treatment of domestic sewage in small and medium towns, the treatment of domestic sewage in rural areas, polluted river water and the treatment of sewage in remote areas, and has wide application prospect. However, denitrification of the traditional artificial rapid infiltration system is mainly completed through nitrification and denitrification of microorganisms, and because the artificial rapid infiltration system adopts a plug-flow water inlet mode, the lower part of the tank body has good lack/anaerobic conditions, but along with the gradual infiltration of sewage, organic matters in the sewage are gradually decomposed by the microorganisms, so that the C/N of the sewage permeating into the lower part of the tank body is low, the requirement of denitrifying bacteria on organic carbon sources cannot be met, the TN removal rate is only 10-30%, the standard discharge cannot be achieved, and the further popularization and application of the technology are limited. Not only the artificial rapid infiltration system faces the problem of poor denitrification effect when the sewage has low C/N ratio, but also the traditional denitrification process faces the challenge of insufficient organic carbon source when the C/N of the sewage is low (C/N is less than 3) in other biological treatment systems. If the denitrification effect of the sewage with low C/N ratio is to be effectively improved, the problem of carbon source shortage in the denitrification process needs to be solved.
In recent years, the anaerobic ammonia oxidation process is highly concerned in the field of biological denitrification, compared with the whole-course nitrification and denitrification process, the process has the advantages that the nitrification process reduces the oxygen consumption, does not need an additional carbon source, saves the cost, does not generate secondary pollution, can effectively solve the problem of insufficient carbon source in the traditional biological denitrification, and gradually becomes a research hotspot in the field of low C/N ratio sewage denitrification. The anammox process is carried out with NO2 --N is an electron acceptor, and an electron donor NH is added under anoxic/anaerobic conditions4 +Process for converting N into gaseous nitrogen, whereas NO contained in general sewage2 -The concentration of N is generally lower, and the water inlet requirement of anaerobic ammonia oxidation cannot be met.
The stoichiometric equation for the anammox reaction is as follows:
NH4 ++1.32NO2 -+0.066HCO3 -+0.13H+→1.02N2+0.26NO3 -+0.066CH2O0.15N0.15+2.03H2O
from the above, the substrate NH4 +-N and NO2 -The theoretical stoichiometric ratio of N is 1:1.32, so that the nitration reaction is stopped at a partial nitration stage, i.e. about 60% NH is controlled4 +Oxidation of-N to NO2 -N, NO in the effluent2 --N and NH4 +The mass concentration ratio of-N is close to the theoretical value of 1.32 of anammox, which is a precondition for realizing high-efficiency denitrification of anammox.
Patent 201810444023.X discloses a device and method for realizing shortcut nitrification by adding a certain amount of potassium chlorate in the stage of shortcut nitrification to induce NO2 --N accumulation, providing a basis for subsequent denitrification or anammox denitrification; patent 201710225673.0 discloses a device and method for partial shortcut nitrification-anaerobic ammonia oxidation by adding hydroxylamine, which can achieve better NO by adding hydroxylamine2 --N accumulation effect, enabling partial shortcut nitrification reactor start-up and maintaining high NO2 --N accumulation; patent 201811372714.X discloses a method for controlling shortcut nitrification by using a combined inhibitor, which realizes stable shortcut nitrification by repeatedly adding formic acid, hydrazine and hydrazine in SBR or MBBR with stable operation. The method adopts one or more inhibitors to realize short-cut nitrification, but the inhibitors have toxicity to microorganisms, and when the inhibitors are improperly added, the water body suffers secondary pollution.
Patent 201510340540.9 discloses a device and method for starting urban sewage short-cut nitrification by using dissolved oxygen regulation coupling intermittent aeration, wherein a 15-min aerobic stirring/15-min anoxic stirring intermittent aeration mode is adopted, and dissolved oxygen is regulated and controlled to be 0.2-0.3 mg/L for 30-60 days in the first stage; in the second stage, stable short-cut nitrification is realized after the operation of 1.5-2.0 mg/L of dissolved oxygen is regulated and controlled for 30 days; patent 201410321168.2 discloses a method for starting rapid short-cut nitrification, which comprises adding sewage into SBR to make the sludge concentration be 2500-3500 mg/L, controlling the water temperature at 30 +/-1 ℃ and pH at 7.9-8.2, and adjusting the dissolved oxygen concentration and aeration time to realize short-cut nitrification. However, these methods are directed to activated sludge systems, whereas artificial rapid infiltration systems are typical of biofilm systems, fixed bed systems, and have no special aeration and oxygenation equipment, and are not suitable for artificial rapid infiltration systems. Secondly, in the process that sewage moves in a plug flow manner in the artificial rapid infiltration system, the quality of the sewage changes step by step and is controlled by a certain factor alone, so that efficient and stable short-cut nitrification is difficult to realize.
Patent 201610343798.9 discloses a device and a method for treating sewage by nitrosation based on weak magnetic field, which utilizes the characteristic that the organism has bioelectricity or magnetic substance, and enhances the speed of free ammonia entering the inside of ammonia oxidizing bacteria through magnetic field to realize nitrosation starting; patent 201510373241.5 discloses a device and method for treating low-temperature high ammonia nitrogen wastewater by using a constant magnetic field, which utilizes the magnetic field to increase the ammoxidation reaction rate, promotes the enrichment of ammoxidation bacteria, and simultaneously realizes the efficient nitrosation reaction of a reactor under the low-temperature condition by controlling the dissolved oxygen, pH, hydraulic retention time and sludge age. The methods rely on an activated sludge system, only realize nitrosation of sewage preliminarily, do not really realize integrated high-efficiency denitrification, and secondly, the treatment objects are all wastewater with high ammonia nitrogen concentration, the activated sludge system can generate excess sludge in the sewage treatment process, and the discharge and treatment of the excess sludge can increase the operation cost.
Patent 201610428030.1 discloses a two-stage constructed rapid infiltration system based on anaerobic ammonia oxidation and its starting method, by adjusting NO2 -Initial concentration of-N to 16-40 mg/L, NH4 +The concentration of N is 14-34 mg/L, the prepared wastewater is kept at 30-40 ℃ by a constant temperature water bath heating rod in a water distribution pool, and Na is adopted2CO3The pH value of the prepared wastewater is adjusted to 7.5-8.0, and anaerobic ammonia oxidation is realized. However, the regulation of temperature, pH and the like will undoubtedly increase the operation complexity and the operation cost, which is contrary to the manual rapid infiltration system having the characteristics of simple operation, cost saving and the like, and the possibility of secondary pollution exists due to the addition of various exogenous additives. Meanwhile, when the quality of the inlet water fluctuates and the environmental conditions change, the stability of the method is influenced to different degrees.
In addition, long starting and regulating time is usually needed to ensure that the water quality of partial short-cut nitrification effluent meets the demand of anaerobic ammonia oxidation as much as possible; the anaerobic ammonia oxidation bacteria have slow growth rate, long multiplication time and low cell yield, so that the starting time of anaerobic ammonia oxidation is very long, and the popularization and application of the technology are limited because the bacteria are very sensitive to environmental conditions and have poor running stability. Therefore, achieving rapid start-up of partial shortcut nitrification and anammox is also an urgent problem to be solved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the above problem, provide a two pond artifical rapid infiltration layer system that is used for high-efficient denitrogenation of low C/N ratio sewage, but this system integral type realizes partial short distance nitration and anaerobic ammonia oxidation denitrogenation, has that required boot time is short, denitrogenation is efficient, do not produce surplus sludge, running cost low, easy and simple to handle nimble, area is little, no secondary pollution's advantage.
In order to solve the technical problem, the technical scheme of the utility model is that: a double-tank artificial rapid infiltration system for efficiently denitrifying sewage with low C/N ratio comprises a water inlet tank, an artificial rapid infiltration tank I, an artificial rapid infiltration tank II and a water outlet tank, wherein a magnetic field is arranged in the artificial rapid infiltration tank I, a water distribution area, a gravel area I, a filter material area I, a gravel area II, a partition plate and a water collection area are sequentially arranged from top to bottom, the partition plate is provided with a water outlet I, the artificial rapid infiltration tank II is sequentially provided with a gravel area III, a filter material area II and a gravel area IV from bottom to top, the artificial rapid infiltration tank I is inserted into the artificial rapid infiltration tank II, and the bottom of the artificial rapid infiltration tank I is communicated with the artificial rapid infiltration tank II through the gravel area III;
the sewage passes through the water distribution area, the first gravel area, the first filter material area, the second gravel area, the water collection area, the third gravel area, the second filter material area and the fourth gravel area in sequence through the water inlet tank and then enters the water outlet tank.
Preferably, the magnetic field is arranged at the first filtering material area and is realized by magnets which are arranged at two sides of the exterior of the artificial rapid infiltration tank in parallel.
Preferably, a magnetic field sensor is further arranged at the center of the first filter material area and connected with a magnetic field tester, the magnet is in a flat plate shape or a semi-arc shape, the height of the magnet is not lower than that of the first filter material area, and the width of the magnet is not smaller than the diameter of the first filter material area.
Preferably, the filter materials in the first filter material area are inoculated by aerobic nitrification sludge (mixed liquor volatile suspended solid concentration MLVSS is 4000-6000 mg/L) before filling, and the filter materials in the second filter material area are inoculated by anaerobic ammonia oxidation sludge (mixed liquor volatile suspended solid concentration MLVSS is 5000-7000 mg/L) before filling.
Preferably, the height ratio of the water distribution area, the first gravel area, the first filter material area, the second gravel area and the water collection area is 2-6: 1: 10-14: 1: 10 to 14;
the water distribution area and the water collection area are not filled with any filling materials, the first gravel area and the second gravel area are filled with gravel with the particle size of 5-10 mm, and the first filter material area adopts natural river sand and sea sand according to the volume ratio of 3-8: 1, uniformly mixing and filling, wherein the particle diameters of the natural river sand and the sea sand are 0.25-0.5 mm and 0.15-0.30 mm respectively.
Preferably, the height ratio of the third gravel area, the second filter material area and the fourth gravel area is 1: 8-15: 1;
and the third gravel area and the fourth gravel area are filled with gravels with the particle size of 5-10 mm, and the second filter material area is filled with natural river sand and composite hydrothermal carbon according to the mass ratio of 2-5: 1, uniformly mixing and filling, wherein the particle sizes of the natural river sand and the composite hydrothermal carbon are 0.15-0.30 mm.
The composite hydrothermal carbon is preferably prepared by taking livestock and poultry manure and waste plants as raw materials, wherein the livestock and poultry manure comprises one or more of sheep manure, pig manure, cow manure and the like, the waste plants comprise one or more of fallen leaves, straws, barks and the like, and the preparation method comprises the following steps: respectively drying livestock and poultry manure and waste plants in the sun, crushing the livestock and poultry manure and the waste plants, and sieving the crushed livestock and poultry manure and the waste plants by a 50-mesh sieve, wherein the mass ratio of the livestock and poultry manure to the waste plants is (1-4): 1 to obtain mixed powder, and mixing the mixed powder and deionized water according to the mass ratio (g: mL) of the mixed powder to the volume of the deionized water of 1: (5-15), weighing a certain mass of mixed powder, weighing deionized water with a corresponding volume, adding the mixture into a hydrothermal reaction kettle, placing the hydrothermal reaction kettle in an oven, heating at the constant temperature of 130 ℃ for 1-3 hours in a closed manner, and then heating at the constant temperature of 180 ℃ for 10-30 hours in a closed manner. After the reaction is finished, cooling to room temperature, washing with deionized water, drying, and sieving with a 50-mesh sieve to obtain the composite hydrothermal carbon.
It is particularly worth mentioning that: and the filling of the filler in the first gravel area, the first filter material area, the second gravel area, the third gravel area, the second filter material area and the fourth gravel area is not limited to the preferred mode, and other conventional filling modes in the field can be adopted, and the filling mode is only used for achieving a better implementation effect. The innovation point of the utility model is the arrangement of the structure itself.
Preferably, the height of the water collecting area is not lower than that of the manual rapid infiltration pond II, and the diameter ratio of the manual rapid infiltration pond I to the manual rapid infiltration pond II is 1: 2 to 4.
Preferably, a sprayer is arranged above the artificial rapid infiltration tank, the water inlet tank is communicated with the sprayer through a water pipe, a metering pump is arranged on the water pipe, and the metering pump is connected with a relay;
preferably, the artificial rapid infiltration pond II is provided with a water outlet II, and the water outlet II is positioned at the four positions of the gravel area and communicated with a water outlet tank through a water pipe.
The utility model provides a pair of two pond manual work rapid infiltration layer systems that is used for high-efficient denitrogenation of low C/N ratio sewage has following beneficial effect:
(1) the starting time is short: by means of the unique structural design of the artificial rapid infiltration tank, the rapid start of partial shortcut nitrification and anaerobic ammonia oxidation can be realized, and by the starting method of the utility model, the starting time of partial shortcut nitrification-anaerobic ammonia oxidation of the double-tank artificial rapid infiltration system only needs 5-18 d;
(2) the denitrification efficiency is high: by the repeated fluctuation of water inlet and drying time and the cooperative regulation and control of the magnetic field, partial shortcut nitrification of the artificial rapid infiltration tank I can be realized, and about 60 percent of NH is contained4 +Oxidation of-N to NO2 -N, the effluent quality meets the inlet water quality requirement of anaerobic ammonia oxidation, and NH is added after the effluent quality enters an artificial rapid infiltration tank II4 +-N、NO2 -N can be synchronously removed through anaerobic ammonia oxidation reaction, nitrogen pollutants in sewage are efficiently removed, and the average TN removal rate is higher than 98% during stable operation;
(3) no production of excess sludge: the artificial rapid infiltration tank I and the artificial rapid infiltration tank II are both typical biomembrane fixed bed systems, no excess sludge is generated in the operation process, and compared with an activated sludge system, the process flow is simpler, so that the discharge and treatment cost of the excess sludge is saved, and the secondary pollution of the excess sludge to the environment is reduced;
(4) the operation cost is low: the sewage quality of the artificial rapid infiltration tank I meets the water inlet requirement of anaerobic ammonia oxidation of the artificial rapid infiltration tank II through partial short-cut nitrification, and the full autotrophic nitrogen removal can be realized without an organic carbon source in the anaerobic ammonia oxidation process, so that the problem of insufficient carbon source in the sewage with low C/N ratio is effectively solved, and the adding cost of the organic carbon source is saved; the first artificial rapid infiltration tank realizes natural reoxygenation by adopting a mode of water inlet and dry falling alternate operation, does not need additional artificial aeration and oxygenation, and saves the aeration energy consumption; the effluent of the artificial rapid infiltration pond I firstly enters a water collecting area and then enters the artificial rapid infiltration pond II through a gravel area communicated with the bottom, and the water inlet of the artificial rapid infiltration pond II can be completed by gravity pushing, so that an additional water inlet pump is not needed, and the power consumption is saved;
(5) the operation is simple, convenient and flexible: part of short-cut nitrification is realized by adopting water inlet and falling-dry repeated fluctuation in cooperation with magnetic field regulation, the influence of water quality fluctuation and environmental condition change is avoided, flexible regulation and control can be performed according to the change of actual water quality and environmental conditions, especially, the adjustment can be performed at any time when sudden conditions such as water quality fluctuation occur, the stability of treatment effect is ensured, and the operation is simple, convenient and flexible;
(6) the occupied area is small: the bottom of the artificial rapid infiltration pond I is communicated with the bottom of the artificial rapid infiltration pond II to form a double-pond artificial rapid infiltration structure which is compact in structure, can realize the partition of an oxygen environment and save the occupied area;
(7) no secondary pollution: chemical inhibitors are not required to be added in the starting of partial shortcut nitrification and anaerobic ammonia oxidation, the adjustment of pH and nitrogen pollutant concentration of sewage is not required, acid-base regulators are not required to be added, and an organic carbon source is not required to be additionally added in the whole denitrification process, so that secondary pollution is not generated.
Drawings
FIG. 1 is a schematic structural view of the double-tank artificial rapid infiltration system for the efficient denitrification of sewage with low C/N ratio.
Description of reference numerals: 1. a water inlet tank; 2. a metering pump; 3. a relay; 4. a sprinkler; 5. a first artificial rapid infiltration tank; 6. a water distribution area; 7. a first gravel crushing area; 8. a first filtering material area; 9. a second stone crushing area; 10. a water collection area; 11. a first water outlet; 12. a second artificial rapid infiltration tank; 13. a gravel area III; 14. a second filtering material area; 15. a fourth macadam area; 16. a water outlet II; 17. a water outlet tank; 18. a magnet; 19. a magnetic field sensor; 20. a magnetic field tester.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments:
as shown in figure 1, the utility model discloses a structural schematic diagram of two ponds artifical rapid infiltration layer system for high-efficient denitrogenation of low C/N ratio sewage, this two ponds artifical rapid infiltration layer system include into water case 1, artifical rapid infiltration layer pond one 5, artifical rapid infiltration layer pond two 12, outlet tank 17 and provide the magnet 18 in magnetic field.
In this embodiment, a sprinkler 4 is arranged above the artificial rapid infiltration pond I5, the water inlet tank 1 is communicated with the sprinkler 4 through a water pipe, a metering pump 2 is arranged on the water pipe, and the metering pump 2 is connected with a relay 3. The sewage inlet hydraulic load is controlled by a metering pump 2 and a relay 3.
A water distribution area 6, a gravel area I7, a filter material area I8, a gravel area II 9 and a water collecting area 10 are sequentially arranged in the artificial rapid infiltration pond I5 from top to bottom. A partition plate is arranged between the second gravel area 9 and the water collecting area 10, filter cloth is arranged between the partition plate and the second gravel area 9, a first water outlet 11 is arranged in the center of the partition plate, and the filter cloth is used for preventing filter materials from flowing out along with sewage seeping downwards. The height ratio of the water distribution area 6, the first gravel area 7, the first filter material area 8, the second gravel area 9 and the water collection area 10 is 4: 1: 11: 1: 11. the water distribution area 6 and the water collection area 10 are not filled, the first gravel area 7 and the second gravel area 9 are preferably filled with gravels with the particle size of 5-10 mm, and the first filter area 8 is preferably filled with natural river sand and sea sand according to the volume ratio of 5: 1, uniformly mixing and filling, wherein the particle diameters of the natural river sand and the sea sand are 0.25-0.5 mm and 0.15-0.30 mm respectively. The sea sand contains certain salt, and the salt is not beneficial to the growth of NOB, so that the NOB is poor in adhesive capacity in the filter material area I8 and is gradually washed away. The filter material in the first filter material area 8 is preferably inoculated by aerobic nitrification sludge (the concentration of mixed liquid volatile suspended solid MLVSS is 5720mg/L) before filling.
The magnetic field sensor 19 is arranged at the center of the first filtering material area 8 and is also connected with a magnetic field determinator 20, and the magnetic field intensity is transmitted to the magnetic field determinator 20 through the magnetic field sensor 19 for reading. The magnets 18 are arranged on two sides of the first filtering material area 8 in parallel and are in a flat plate shape, the height of the magnets 18 is not lower than that of the first filtering material area 8, and the width of the magnets 18 is not smaller than the diameter of the first filtering material area 8. The magnet 18 may be any of a sintered ferrite magnet, a bonded ferrite magnet, an injection-molded ferrite magnet, and the like. In this embodiment, a sintered ferrite magnet is used, and the main material includes BaFe12O19And SrFe12O19. It should be noted that the magnet 18 is provided to provide a magnetic field, but the implementation of the magnetic field is not limited to this embodiment, and other conventional manners in the art can be adopted without any particular limitation, such as a solenoid or the like.
The artificial rapid infiltration pond II 12 is sequentially provided with a third gravel area 13, a second filter material area 14 and a fourth gravel area 15 from bottom to top, the artificial rapid infiltration pond I5 is inserted into the artificial rapid infiltration pond II 12, and the bottom of the artificial rapid infiltration pond I is communicated with the artificial rapid infiltration pond II 12 through the third gravel area 13. The height ratio of the third gravel area 13, the second filter material area 14 and the fourth gravel area 15 is 1: 10: 1. further, the height of the water collecting area 10 is the same as that of the second artificial rapid infiltration pond 12, and the diameter ratio of the first artificial rapid infiltration pond 5 to the second artificial rapid infiltration pond 12 is 1: 3. the gravel area III 13 and the gravel area IV 15 are preferably filled with gravels with the particle size of 5-10 mm, and the filter material area II 14 is preferably filled with natural river sand and composite hydrothermal carbon according to the mass ratio of 3: 1, uniformly mixing and filling, wherein the particle sizes of the natural river sand and the composite hydrothermal carbon are 0.15-0.30 mm. The filter materials in the second filter material area 14 are preferably inoculated with anaerobic ammonia oxidation sludge (the mixed liquid volatile suspended solid concentration MLVSS is 6650mg/L) before filling.
In this embodiment, the composite hydrothermal carbon is prepared from sheep manure and ficus microcarpa deciduous leaves as raw materials, and the specific method is as follows: drying the sheep manure and the ficus microcarpa deciduous leaves respectively, crushing and sieving with a 50-mesh sieve, wherein the mass ratio of the sheep manure to the ficus microcarpa deciduous leaves is 2: 1 to obtain mixed powder, and mixing the mixed powder and deionized water according to the mass ratio (g: mL) of the mixed powder to the volume of the deionized water of 1: 5, weighing a certain mass of mixed powder, weighing deionized water with a corresponding volume, adding the mixed powder into a hydrothermal reaction kettle, placing the hydrothermal reaction kettle in an oven, and heating the hydrothermal reaction kettle for 2 hours at a constant temperature of 130 ℃ in a closed manner, and then heating the hydrothermal reaction kettle for 15 hours at a constant temperature of 180 ℃ in a closed manner. After the reaction is finished, cooling to room temperature, washing with deionized water, drying, and sieving with a 50-mesh sieve to obtain the composite hydrothermal carbon. It should be noted that the preparation of the composite hydrothermal carbon is not limited to this example, and may be performed by other conventional preparation methods in the art.
The second artificial rapid infiltration pond 12 is provided with a second water outlet 16, and the second water outlet 16 is positioned at the fourth gravel area 15 and is communicated with a water outlet tank 17 through a water pipe.
Sewage sequentially enters a water distribution area 6, a gravel area I7, a filter material area I8 and a gravel area II 9 from a water inlet tank 1 through a water pipe and a sprayer 4, enters a water collection area 10 from a water outlet I11, sequentially enters a filter material area II 14 and a gravel area IV 15 through a gravel area III 13, and finally enters a water outlet tank 17 through a water outlet II 16.
It is following right the utility model provides a concrete operation method of two pond artifical rapid infiltration layer systems carries out further explanation to further show the utility model discloses an advantage:
the method for efficiently denitrifying the sewage with the low C/N ratio by utilizing the double-tank artificial rapid infiltration system comprises the following steps:
s1: controlling the sewage inlet hydraulic load to be 0.8-1.5 m/d through a metering pump 2 and a relay 3, respectively controlling the water inlet time and the water falling time to be 1h and 2-5 h, not applying a magnetic field in the stage, adjusting the water inlet time and the water falling time to be 1h and 72-110 h respectively after the operation is stable, operating for 1-2 periods, controlling the central magnetic field intensity of a first filter material area 8 to be 0-80 mT through adjusting the distance of magnets 18 in the water falling period, and transmitting the magnetic field intensity to a magnetic field determinator 20 through a magnetic field sensor 19 for reading;
s2: after the dry falling period of the step S1 is finished, recovering water inflow and dry falling time to be 1h and 2-5 h respectively, applying no magnetic field in the period, adjusting the water inflow and dry falling time to be 1h and 24-72 h respectively after running for 2-4 periods, running for 1-2 periods, controlling the central magnetic field intensity of a first filter material area 8 to be 0-40 mT by adjusting the distance of the magnets 18 in the dry falling period, and transmitting the magnetic field intensity to the magnetic field tester 20 through the magnetic field sensor 19 for reading;
s3: after the drying period of the step S2 is finished, no magnetic field is applied, the water inlet and drying time is recovered to be 1h and 2-5 h respectively, and the partial shortcut nitrification and the rapid start of the anaerobic ammonia oxidation can be realized by adopting the mode of alternatively running for 1h of water inlet and 2-5 h of drying, so that the efficient denitrification of the sewage with the low C/N ratio is realized.
By the cooperative regulation and control means, NO in the sewage entering the water collecting area 10 from the water outlet I112 --N accumulation higher than 98%, NO2 --N and NH4 +When the mass concentration ratio of-N is close to 1.32, the partial shortcut nitrification is successfully started, the water quality can meet the water inlet quality requirement of anaerobic ammonia oxidation of the artificial rapid infiltration tank II 12, and NH can be oxidized by anaerobic ammonia oxidation after entering the artificial rapid infiltration tank II 124 +-N、NO2 --N is synchronously converted into N2Thereby realizing high-efficiency denitrification.
Following right the utility model provides a working process and the principle that are used for two pond artifical rapid infiltration layer systems of high-efficient denitrogenation of low C/N ratio sewage carry out detailed explanation to further show the utility model discloses an advantage:
partial short-cut nitrification of the sewage in a filter material area I8 of an artificial rapid infiltration tank I5, namely NH in the sewage4 +About 60% of N is oxidized to NO by Ammonia Oxidizing Bacteria (AOB)2 -N, it is difficult to convert NO into NO because nitrite-oxidizing bacteria (NOB) in the first filter material region 8 is severely inhibited2 -Further oxidation of-N to NO3 -N, NO in the sewage entering the water collection area 10 from the water outlet I112 --N accumulation higher than 98%, NO2 --N and NH4 +The mass concentration ratio of N to N is close to 1.32, and the requirement of the inlet water quality for anaerobic ammonia oxidation of the artificial rapid infiltration pond II 12 is met.
The principle that partial short-cut nitrification of sewage occurs in a filter material area I8 of an artificial rapid infiltration pond I5 is that the artificial rapid infiltration pond I5 adopts a mode of water inlet and dry falling alternate operation to realize natural reoxygenation and can meet the requirements of AOB and NOB on an oxygen environment, but the utility model discloses unique structural design and regulation and control mode can realize selective elimination of NOB while enriching AOB, and the concrete expression is that ① filter material area I8 adopts natural river sand and sea sand to fill, the sea sand contains certain salinity, the existence of salinity is unfavorable for growth of NOB, therefore the adhesion ability of NOB in the filter material area I8 is poor and is gradually eliminated, ② because NOB's sensitivity to nutrient substances and environmental conditions is higher than AOB, AOB's activity is inhibited through repeated fluctuation of water inlet and dry falling time and coordinated regulation and control of magnetic field, NOB can not adapt to and gradually die, the superiority of NOB becomes flora in the filter material area I8, and provides basic short-cut nitrification for the occurrence of partial short-cut nitrification.
Anaerobic ammonia oxidation of the sewage in the second filtering material area 14 of the second artificial rapid infiltration pond 12 is carried out, namely, the sewage in the water collecting pond enters the second filtering material area 14 along the third gravel area 13 and then is treated by residual NH under the action of Anaerobic Ammonia Oxidizing Bacteria (AAOB)4 +-N as an electron donor with accumulated NO2 --N as electron acceptor, NH4 +-N、NO2 --N is synchronously converted into N2Thereby realizing the process of high-efficiency denitrification.
The principle of anammox of sewage in the second filtering material area 14 of the second artificial rapid infiltration pond 12 is that filter materials in the second ① filtering material area 14 are inoculated by anammox sludge (MLVSS is 5000-7000 mg/L) before filling, the anammox sludge is rich in AAOB and can realize rapid start of anammox under proper conditions, the second ② filtering material area 14 is filled by natural river sand and livestock and poultry manure hydrothermal carbon, the adopted composite hydrothermal carbon has huge specific surface area and developed pore structure and can provide conditions for effective attachment, interception and growth enrichment of AAOB to promote rapid generation of anammox, the bottom of the second ③ artificial rapid infiltration pond 12 is communicated with the bottom of the first artificial rapid infiltration pond 5 through a third crushed stone area 13, and the height of the water collection area 10 is not lower than that of the second artificial rapid infiltration pond 12, so that the second artificial rapid infiltration pond 12 is always in a flooded state, and good anaerobic conditions are formed in the second filtering material area 14 to promote growth and propagation of AAOB, thereby creating favorable conditions for anammox generation.
Following through experimental example and comparative example right the utility model provides a two pond artifical rapid infiltration layer system for high-efficient denitrogenation of low C/N ratio sewage further explains, in order to demonstrate the utility model discloses a technological effect:
the experimental examples and comparative examples all adopt the low C/N ratio (C/N) generated by residents in certain villages and towns<3) The wastewater to be treated in this example was COD or NH4 +The mass concentrations of-N, TN and TP are respectively 90.5-105.6 mg/L, 42.4-48.5 mg/L, 45.6-52.1 mg/L and 1.9-4.6 mg/L, the pH value is 6.8-7.6, and the ambient temperature is 20-25 ℃. The water quality indexes are detected by the standards specified in Water and wastewater monitoring and analyzing method (fourth edition) issued by the State environmental protection administration.
Examples of the experiments
S1: the hydraulic load of sewage inflow is controlled to be 1.0m/d through a metering pump 2 and a relay 3, the water inflow time and the drying time are respectively 1h and 3h, and no magnetic field is applied at the stage. After the operation is stable, the water inlet time and the drying time are adjusted to be 1h and 109h respectively, the operation is carried out for 1 period, the central magnetic field intensity of a first filter material area 8 is controlled to be 60mT by adjusting the distance between magnets 18 in the drying period, and the magnetic field intensity is transmitted to a magnetic field measuring instrument 20 through a magnetic field sensor 191 to be read;
s2: after the drying period of step S1 is over, the water inlet and drying time are respectively 1h and 3h, and no magnetic field is applied at this stage. After 3 periods of operation, adjusting the water inlet time and the drying time to be 1h and 71h respectively, and operating for 1 period, wherein the central magnetic field intensity of a first filter material area 8 is controlled to be 35mT by adjusting the distance between magnets 18 during the drying period, and the magnetic field intensity is transmitted to a magnetic field measuring instrument 20 through a magnetic field sensor 19 for reading;
s3: after the drying period of the step S2 is finished, no magnetic field is applied, the water inlet and drying time is recovered to be 1h and 3h respectively, and the partial shortcut nitrification and the anaerobic ammonia oxidation can be quickly started by adopting the mode of alternatively running the water inlet for 1h and the drying time for 3h, so that the high-efficiency denitrification of the sewage with the low C/N ratio is realized.
The test results for run 60d indicated that: NH in the sewage entering the water collecting area 10 from a water outlet I11 of the artificial rapid infiltration tank I54 +-N、NO3 --N、NO2 -The average mass concentration of-N is 18.8mg/L, 0.35mg/L, 25.8mg/L, NH4 +Average removal of-N, NO2 -Average accumulation of-N, NO2 --N and NH4 +The average mass concentration ratios of-N to-N are respectively 60.4%, 98.7% and 1.37, and the water quality can meet the water quality requirement of inflow water for anaerobic ammonia oxidation in the artificial rapid infiltration pond II 12. COD and NH in water discharged from a water outlet II (16) of the artificial rapid infiltration pond II 124 +The average mass concentrations of-N, TN were 1.6mg/L, 0.15mg/L, and 0.95mg/L, respectively, COD and NH4 +The average removal rates of-N, TN were 98.3%, 99.7%, and 98.1%, respectively.
Comparative example 1
The hydraulic load of sewage inflow is controlled to be 1.0m/d through a metering pump 2 and a relay 3, the water inflow time and the drying time are respectively 1h and 3h, the operation is carried out for 10d in a circulating and alternating mode, and a magnetic field is not applied in the period.
The test results for run 60d indicated that: NH in the sewage entering the water collecting area 10 from a water outlet I11 of the artificial rapid infiltration tank I54 +-N、NO3 --N、NO2 -The average mass concentration of-N is 22.5mg/L, 23.1mg/L, 3.7mg/L, NH4 +Average removal of-N, NO2 -Average accumulation of-N, NO2 --N and NH4 +The average mass concentration ratio of N to N is 52.6 percent, 13.8 percent and 0.16 percent respectively, and the water quality can not meet the water quality requirement of the inlet water of the artificial rapid infiltration pond II 12 for anaerobic ammonia oxidation. COD and NH in water discharged from a water outlet II (16)16 of the artificial rapid infiltration pond II 124 +The average mass concentrations of-N, TN were 4.9mg/L, 10.6mg/L, and 37.9mg/L, COD and NH, respectively4 +The average removal rates of-N, TN were 94.9%, 77.7%, and 25.1%, respectively.
Comparative example 2
The hydraulic load of sewage inflow is controlled to be 1.0m/d through a metering pump 2 and a relay 3, the water inflow time and the drying time are respectively 1h and 3h, and no magnetic field is applied at the stage. After the operation is stable, the water inlet time and the drying time are respectively adjusted to be 1h and 109h, the operation is carried out for 1 period, and no magnetic field is applied at the stage. After the drying period, the water feeding and drying time is respectively 1h and 3h, and no magnetic field is applied in the stage. After running for 3 cycles, the water inlet time and the drying time are respectively adjusted to be 1h and 71h, and the running is carried out for 1 cycle, and no magnetic field is applied in the stage. After the drying period is finished, the water inlet recovery time and the drying time are respectively 1h and 3h, and the circulation and the alternate operation are carried out.
The test results for run 60d indicated that: NH in the sewage entering the water collecting area 10 from a water outlet I11 of the artificial rapid infiltration tank I54 +-N、NO3 --N、NO2 -The average mass concentration of-N is 20.5mg/L, 18.1mg/L, 10.6mg/L, NH4 +Average removal of-N, NO2 -Average accumulation of-N, NO2 --N and NH4 +The average mass concentration ratio of N to N is respectively 56.8 percent, 36.9 percent and 0.52, and the water quality can not meet the water quality requirement of the inlet water of the artificial rapid infiltration pond II 12 for anaerobic ammonia oxidation. COD and NH in water discharged from a water outlet II (16) of the artificial rapid infiltration pond II 124 +The average mass concentrations of-N, TN were 3.7mg/L, 7.1mg/L, and 29.2mg/L, COD and NH, respectively4 +The average removal rates of-N, TN were 96.1%, 85.1%, and 42.3%, respectively.
Comparative example 3
The sewage inlet hydraulic load is controlled to be 1.0m/d through the metering pump 2 and the relay 3, the water inlet time and the drying time are respectively 1h and 3h, the central magnetic field intensity of the filter material area I8 is controlled to be 60mT through the distance between the adjusting magnets 18 during the drying period, and the magnetic field intensity is transmitted to the magnetic field measuring instrument 20 through the magnetic field sensor 19 for reading.
The test results for run 60d indicated that: NH in the sewage entering the water collecting area 10 from a water outlet I11 of the artificial rapid infiltration tank I54 +-N、NO3 --N、NO2 -The average mass concentration of-N is 19.3mg/L, 20.4mg/L, 8.1mg/L, NH4 +Average removal of-N, NO2 -Average accumulation of-N, NO2 --N and NH4 +The average mass concentration ratio of N to N is 59.4 percent, 28.4 percent and 0.42 percent respectively, and the water quality can not meet the water quality requirement of the inlet water of the artificial rapid infiltration pond II 12 for anaerobic ammonia oxidation. COD and NH in water discharged from a water outlet II (16) of the artificial rapid infiltration pond II 124 +The average mass concentrations of-N, TN were 4.4mg/L, 8.2mg/L, and 30.5mg/L, COD and NH, respectively4 +The average removal rates of-N, TN were 95.4%, 82.7%, and 39.7%, respectively.
Through comparison, the rapid start of partial shortcut nitrification and anaerobic ammonia oxidation cannot be realized without adopting the repeated fluctuation of water inlet and drying time and the cooperative regulation and control of a magnetic field (comparative example 1), or only regulating the water inlet and drying time (comparative example 2), or only regulating the magnetic field intensity (comparative example 3), and the denitrification efficiency cannot be obviously improved; through the utility model provides a regulation and control in coordination of intaking, falling dry time and fluctuating repeatedly and magnetic field can realize that artifical rapid infiltration layer goes out water NO in a pond2 --N accumulation higher than 98%, NO2 --N and NH4 +The mass concentration ratio of N to N is close to 1.32, partial shortcut nitrification is successfully started, the water quality can meet the water quality requirement of inflow water for anaerobic ammonia oxidation in an artificial rapid infiltration secondary tank, and NH can be oxidized by anaerobic ammonia after the inflow water enters the artificial rapid infiltration secondary tank4 +-N、NO2 --N is synchronously converted into N2Thereby realizing high-efficiency denitrificationCompared with the comparative example 1, the comparative example 2 and the comparative example 3, the average TN removal rate is respectively improved by 73.0%, 55.8% and 58.4%, compared with the traditional manual rapid infiltration system, the average TN removal rate is improved by 58.1-88.1%, and the denitrification effect is obviously improved.
To sum up, the utility model provides a pair of pond artifical rapid infiltration layer system for low C/N ratio sewage high efficiency denitrogenation adopts unique structural design, the cooperation regulation and control of intaking, the time of falling to dry is undulant repeatedly and magnetic field, and the nitrite oxidizing bacteria is eliminated to the selectivity, and does not produce the influence to the ammoxidation bacteria, thereby remains and enrichment ammoxidation bacteria, can the integral type realizes partial short distance nitration and anaerobic ammonia oxidation denitrogenation, has that the start-up time is short, denitrogenation efficiency is high, produce no surplus sludge, the running cost is low, easy and simple to handle nimble, area is little, no secondary pollution etc. advantage, has not only solved traditional artifical rapid infiltration layer system denitrogenation inefficiency problem, provides a brand-new way for low C/N ratio sewage high efficiency denitrogenation again, simultaneously also can provide technical reference for the quick start-up and the steady operation of partial short distance nitration-anaerobic ammonia oxidation of other fixed bed biomembrane systems, has good application value and is worth popularizing in the industry.
It will be appreciated by those of ordinary skill in the art that the embodiments described herein are intended to assist the reader in understanding the principles of the invention, and it is to be understood that the scope of the invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific modifications and combinations based on the teachings of the present invention without departing from the spirit of the invention, and such modifications and combinations are still within the scope of the invention.
Claims (8)
1. The utility model provides a two pond artifical rapid infiltration layer systems that is used for high-efficient denitrogenation of low C/N ratio sewage which characterized in that: the artificial rapid infiltration pond comprises a water inlet tank (1), a first artificial rapid infiltration pond (5), a second artificial rapid infiltration pond (12) and a water outlet tank (17), wherein a magnetic field is arranged in the first artificial rapid infiltration pond (5), a water distribution area (6), a first gravel area (7), a first filter material area (8), a second gravel area (9), a partition plate and a water collection area (10) are sequentially arranged from top to bottom, the partition plate is provided with a first water outlet (11), the second artificial rapid infiltration pond (12) is sequentially provided with a third gravel area (13), a second filter material area (14) and a fourth gravel area (15) from bottom to top, the first artificial rapid infiltration pond (5) is inserted into the second artificial rapid infiltration pond (12), and the bottom of the first artificial rapid infiltration pond is communicated with the second artificial rapid infiltration pond (12) through the third gravel area (13);
the sewage passes through the water distribution area (6), the gravel area I (7), the filter material area I (8), the gravel area II (9), the water collection area (10), the gravel area III (13), the filter material area II (14) and the gravel area IV (15) in sequence through the water inlet tank (1) and then enters the water outlet tank (17).
2. The dual-tank artificial rapid infiltration system for high efficiency denitrification of sewage with low C/N ratio of claim 1, characterized in that: the magnetic field is arranged at the first filtering area (8) and is realized by magnets (18) which are arranged on the two sides outside the artificial rapid infiltration tank (5) in parallel.
3. The dual-tank artificial rapid infiltration system for high efficiency denitrification of sewage with low C/N ratio as claimed in claim 2, characterized in that: the central position of the first filter material area (8) is also provided with a magnetic field sensor (19), the magnetic field sensor (19) is connected with a magnetic field tester (20), the magnet (18) is in a flat plate shape or a semicircular arc shape, the height of the magnet (18) is not lower than the height of the first filter material area (8), and the width of the magnet is not smaller than the diameter of the first filter material area (8).
4. The dual-tank artificial rapid infiltration system for high efficiency denitrification of sewage with low C/N ratio of claim 1, characterized in that: the height ratio of the water distribution area (6), the gravel area I (7), the filter material area I (8), the gravel area II (9) and the water collection area (10) is 2-6: 1: 10-14: 1: 10 to 14; the water distribution area (6) and the water collection area (10) are not filled at all, and the gravel area I (7) and the gravel area II (9) are filled with gravel with the particle size of 5-10 mm.
5. The dual-tank artificial rapid infiltration system for high efficiency denitrification of sewage with low C/N ratio of claim 1, characterized in that: the height ratio of the gravel area III (13), the filter material area II (14) and the gravel area IV (15) is 1: 8-15: 1; and the third gravel area (13) and the fourth gravel area (15) are filled with gravel with the particle size of 5-10 mm.
6. The dual-tank artificial rapid infiltration system for high efficiency denitrification of sewage with low C/N ratio of claim 1, characterized in that: the height of water-collecting area (10) is not less than the height of artifical rapid infiltration layer pond two (12), and the diameter ratio of artifical rapid infiltration layer pond one (5) and artifical rapid infiltration layer pond two (12) is 1: 2 to 4.
7. The double-tank artificial rapid infiltration system for the high-efficiency denitrification of sewage with low C/N ratio as claimed in any one of claims 1 to 6, which is characterized in that: the artificial rapid infiltration pond I (5) is provided with a sprinkler (4) above, the water inlet tank (1) is communicated with the sprinkler (4) through a water pipe, the water pipe is provided with a metering pump (2), and the metering pump (2) is connected with a relay (3).
8. The double-tank artificial rapid infiltration system for the high-efficiency denitrification of sewage with low C/N ratio as claimed in any one of claims 1 to 6, which is characterized in that: and a second water outlet (16) is arranged on the second artificial rapid infiltration pond (12), and the second water outlet (16) is positioned at the fourth crushed stone area (15) and is communicated with a water outlet tank (17) through a water pipe.
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| CN110127955A (en) * | 2019-06-12 | 2019-08-16 | 成都工业学院 | A kind of double pond manual controlled infusions and method for low C/N than wastewater efficient denitrogenation |
| CN110127955B (en) * | 2019-06-12 | 2024-04-30 | 成都工业学院 | Double-pond artificial rapid infiltration system and method for high-efficiency denitrification of low-C/N ratio sewage |
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