CN115432804A - Rare earth reinforced biomembrane electrode coupling artificial wetland and water treatment method - Google Patents
Rare earth reinforced biomembrane electrode coupling artificial wetland and water treatment method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/005—Combined electrochemical biological processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- Life Sciences & Earth Sciences (AREA)
- Microbiology (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Hydrology & Water Resources (AREA)
- Biodiversity & Conservation Biology (AREA)
- Biotechnology (AREA)
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Molecular Biology (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention relates to a rare earth reinforced biological membrane electrode coupling constructed wetland, which comprises a wetland main body, purification plants planted in the wetland, a water distribution pipe and a power supply which are arranged at the bottom of the wetland main body, and further comprises: the lower layer filler area is arranged above the water distribution pipe and is used for supporting layer fillers and preliminarily purifying and adsorbing substances such as nitrogen, phosphorus and the like in the sewage; the invention also discloses a method for treating water by utilizing the artificial wetland, which comprises an upper layer filling area arranged in the lower layer filling area and a biomembrane frame body arranged in the upper layer filling area and is used for providing larger attachment area and growing environment for microorganisms for heterotrophic denitrification and autotrophic denitrification.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a rare earth reinforced biomembrane electrode coupling artificial wetland and a water treatment method.
Background
The water resource in China is in short supply, along with the rapid development of economy, the generated waste water quantity is larger and larger, the tail water quantity discharged by the secondary treatment of a sewage plant is increased gradually, and how to utilize the part of water resource is one of effective ways for solving the current water resource shortage in China. Meanwhile, the eutrophication problem of lakes in China is still severe, and the reduction of nitrogen and phosphorus pollutants in the water bodies of lakes and rivers is very necessary. Therefore, it is necessary to develop a method for deeply purifying the tail water of a sewage plant to safely discharge and even recycle the tail water.
The artificial wetland advanced treatment of the tail water of the sewage plant has the advantages of low investment, low cost, resource utilization and the like, has comprehensive economic and ecological benefits, and is an advanced treatment technology with economic feasibility. However, because of factors such as the structural characteristics, the operation mode, the purification way and the like, the constructed wetland has the problem of unstable denitrification and dephosphorization capability in practical application, and Chinese patent with the application number of '201910599677.4' discloses a biomembrane electrode coupling constructed wetland reactor which is characterized by mainly comprising a reactor main body (1), a water distribution pipe (2), an anode biomembrane (3), a cathode biomembrane (4) and a power supply (5); the lower end of the left side surface of the reactor main body (1) is provided with a water inlet (11), the upper end of the right side surface of the reactor main body (1) is provided with a water outlet (12), and a plurality of water inlets (13) are arranged on the right side surface of the reactor main body (1) below the water outlet (12) at equal intervals; the water distribution pipe (2) is arranged on the inner bottom surface of the reactor main body (1), the cathode biological membrane (4) and the anode biological membrane (3) are respectively arranged on the inner lower part and the inner upper part of the reactor main body (1), and the reactor main body (1) is sequentially divided into a bottom layer filling area (14), a middle layer filling area (15) and an upper layer filling area (16) by the cathode biological membrane (4) and the anode biological membrane (3) from bottom to top; the anode of the power supply (5) is electrically connected with the anode biological membrane (3) through a lead, and the cathode of the power supply (5) is electrically connected with the cathode biological membrane (4) through a lead; "and the summary of the invention in the specification sections [ 0019 ] to [ 0021 ] disclose" a sewage treatment of a biomembrane electrode coupled artificial wetland reactorThe method mainly comprises the following steps: s1: collecting sludge, culturing microorganisms under the condition of intermittent aeration at 25 ℃ and pH7.0 +/-2, artificially preparing nutrient substances, and culturing a biological membrane; pumping sewage into a water distribution pipe through a water inlet pump, and continuously running for 20 days in the reactor to carry out film formation; s2: after the reactor is started successfully, the organic pollutant load (COD) is controlled to be 100-200mg/L, and the ammonia nitrogen pollution (NH) is controlled 4 + -N) load is 6-10mg/L, microcystin MC-LR load (COD) is 8-10mg/L, temperature is 20-30 ℃, and power supply (5) is turned on to control current to be 0-2.5mA; the sewage is purified by the reactor. The biological membrane electrode coupling artificial wetland provided by the invention has general nitrogen removal efficiency, and the filler region layering is carried out through the space of the biological membrane electrode, the space is overlarge, and the treatment index of each pollutant of effluent is low.
Disclosure of Invention
The invention aims to provide a rare earth reinforced biomembrane electrode coupling constructed wetland and a water treatment method, which have the advantages that hydrogen autotrophic denitrifying bacteria appear in a biomembrane electrode coupling constructed wetland system under the stimulation of current, the abundance of flora related to the denitrification process is increased, the synchronous denitrification of autotrophic and heterotrophic denitrification is realized, the removal rate of Total Nitrogen (TN) of effluent of the rare earth lanthanum reinforced biomembrane electrode coupling constructed wetland system is higher, and the problems in the prior art are solved.
In order to realize the purpose, the invention adopts the following technical scheme:
a rare earth reinforced biomembrane electrode coupled artificial wetland comprises a wetland main body, purification plants planted in the wetland, a water distribution pipe and a power supply which are arranged at the bottom of the wetland main body,
further comprising:
the lower layer filler area is arranged above the water distribution pipe and is used for supporting layer fillers and preliminarily purifying and adsorbing substances such as nitrogen, phosphorus and the like in the sewage;
the upper layer filling area is arranged in the lower layer filling area and is used for adsorbing nutrient substances such as nitrogen, phosphorus and the like and other pollutants in the sewage to further purify the water quality;
the biofilm frame body is arranged in the upper-layer filling area and used for hanging a biofilm and providing a larger attachment area and a growing environment for the microorganisms for heterotrophic denitrification and autotrophic denitrification.
Further, the preparation process of the rare earth reinforced biomembrane electrode comprises the following steps: preparing 0.5mol/L lanthanum chloride solution, soaking the iron biomembrane electrode and the graphite biomembrane electrode in the prepared lanthanum chloride solution, taking out after 7 days, naturally drying, repeating the steps for the second time of loading, and modifying the biomembrane electrode for three times.
Further, the water distributor include trunk line and the vertical a plurality of branch pipes that set firmly the pipe wall on the trunk line, the branch pipe delivery port be equipped with and prevent stifled device, prevent stifled device including prevent stifled support, pass the initiative pivot of preventing stifled support lower extreme cross, fixed connection rotatory blade and the power blade of initiative pivot lower extreme, fix on preventing stifled support and the upper cover can dismantle the sealed chamber of connection, establish driven spindle, the center above the sealed chamber and fix the rotary disk in driven spindle and the helical blade that sets up along rotary disk axis direction symmetry, sealed chamber upper cover internal surface edge be equipped with waterproof sealed glue, the vertical coaxial reversal mechanism that is equipped with of sealed intracavity, the corotation axle fixed connection of initiative pivot and coaxial reversal mechanism, the one end of rotary disk and the reversal axle fixed connection of coaxial reversal mechanism are kept away from to driven spindle, helical blade along vertical direction fixed establish at the rotary disk circumferential edge, helical blade's quantity is two at minimum, four at most, helical blade keeps away from the fixed ring that is equipped with of one end of rotary disk, prevent that stifled device utilizes the kinetic energy drive of intake pump to rotate.
Furthermore, more than two biomembrane electrodes are fixedly arranged on the biomembrane frame body, and the biomembrane electrodes are vertically distributed on the biomembrane frame body and are parallel to each other.
Furthermore, the biomembrane electrode is horizontally arranged on the biomembrane frame body, the biomembrane electrode is divided into an anode biomembrane electrode and a cathode biomembrane electrode, the anode biomembrane electrode and the cathode biomembrane electrode are alternately arranged, and zeolite filler is filled between the biomembrane electrodes, wherein the particle size of the zeolite is 5-8mm.
Furthermore, the anode biomembrane electrode is an iron frame, the cathode biomembrane electrode is a graphite frame, the anode biomembrane electrodes are respectively connected in parallel with the anode of the power supply, and the cathode biomembrane electrodes are respectively connected in parallel with the cathode of the power supply.
Furthermore, gravel is arranged in the lower-layer packing area, the particle size of the gravel is 15-30mm, and a water outlet is formed above the upper-layer packing area.
A method for water treatment by coupling a rare earth reinforced biomembrane electrode with an artificial wetland comprises the following steps:
s1, collecting sludge from an anoxic tank of a sewage treatment plant, filtering impurities in the sludge by using a stainless steel filter screen, washing the sludge with centrifugal water for three times, carrying out anaerobic culture for one week, adding a nutrient solution at regular time, and stirring at regular time to keep the activity of the sludge until the acclimation of the sludge is completed;
s2, adding the domesticated activated sludge to the vicinity of a rare earth reinforced biomembrane electrode of the wetland upper-layer filler, starting an artificial wetland water inlet pump, pumping sewage into a water distribution pipe, continuously operating in the artificial wetland, covering the biomembrane electrode with the sewage, performing biofilm formation, and periodically detecting the concentration of pollutants in the effluent of the test device until the biomembrane of the biomembrane electrode is successfully domesticated and the device stably operates;
and S3, turning on a power supply, controlling the voltage value to be 12-17V, electrifying for 2-6 hours, adjusting the interval of the biomembrane electrode to be 80-120 mm, maintaining the hydraulic retention time to be 8-12 hours, keeping the environment temperature to be 25-30 ℃, and purifying the sewage through the artificial wetland.
Further, in the method, the concentration of activated sludge (MLSS) is 10-15mg/L.
Further, in the method, the pH value of inlet water is maintained at 7.5 +/-1, the concentration of nitrogen content (TN) of the inlet water is 14-18mg/L, the concentration of Chemical Oxygen Demand (COD) of organic pollutants is 50-60mg/L, and ammonia nitrogen pollutants (NH) 4 + -N) concentration of 3-8mg/L nitrate nitrogen contaminant (NO) 3 - -N) concentration of 6-15mg/l.
The invention has the following beneficial effects:
1. the biomembrane electrode coupling constructed wetland has a simple structure and a good water treatment effect, wherein the water outlet of the water distribution pipe is provided with the anti-blocking device, the kinetic energy of water inlet of the water inlet pump is utilized to drive the water to rotate, electric power drive is not needed, and the working efficiency of water treatment is improved;
2. in the water treatment method, the denitrification performance of the artificial wetland is enhanced by coupling the biomembrane electrode with the artificial wetland, and nitrate nitrogen NO is mainly used 3 - -N reduction is enhanced;
3. the rare earth lanthanum is utilized to modify the biomembrane electrode, thereby promoting the improvement of the nitrogen removal rate, and the coupling of the biomembrane electrode is matched to lead the bacterial community of the artificial wetland to be replaced, the abundance and the diversity of the bacterial community are increased, the abundance of the bacteria related to the nitrification and denitrification processes is increased, the coupling artificial wetland system generates the hydrogen autotrophic denitrifying bacteria under the stimulation of current, the abundance of the bacteria related to the denitrification process is increased, the synchronous denitrification of autotrophic denitrification and heterotrophic denitrification is realized, and the removal rate is further improved by adjusting the space between the biomembrane electrodes and the electrode voltage.
Drawings
FIG. 1 is a schematic view of the overall structure of the constructed wetland provided by the invention;
FIG. 2 is a schematic top view of a water distributor according to the present invention;
FIG. 3 is a front view of the water distribution branch pipe of the present invention;
FIG. 4 is a sectional view of a water distribution branch pipe according to the present invention;
FIG. 5 is a schematic structural diagram of an experimental reaction apparatus according to the present invention.
The figures are labeled as follows: 100. a wetland main body; 200. purifying the plants; 300. a water distribution pipe; 301. a main pipeline; 302. a branch pipe; 303. an anti-blocking bracket; 304. a driving rotating shaft; 305. a rotating blade; 306. sealing the cavity; 3061. a forward rotation bevel gear; 3062. a drive bevel gear; 3063. a reverse bevel gear; 3064. an auxiliary bevel gear; 307. a driven rotating shaft; 308. rotating the disc; 309. a helical blade; 310. a power blade; 400. a power source; 500. a lower layer packing region; 600. an upper layer of filler zone; 700. a biofilm carrier body; 800. a biofilm electrode; 900. and (7) a water outlet.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, are used in the orientations and positional relationships indicated in the drawings, which are based on the orientations and positional relationships indicated in the drawings, and are used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The examples are as follows:
as shown in fig. 1, the rare earth reinforced bio-membrane electrode coupled artificial wetland comprises a wetland main body 100, purification plants 200 planted in the wetland, a water distribution pipe 300 arranged at the bottom of the wetland main body 100, and a power supply 400, and further comprises: a lower layer filling region 500 arranged above the water distribution pipe 300 and used for supporting layer filling and primarily purifying and adsorbing substances such as nitrogen, phosphorus and the like in the sewage; the upper filling area 600 is arranged in the lower filling area 500 and is used for adsorbing nutrients such as nitrogen and phosphorus and other pollutants in the sewage to further purify the water quality; the biofilm frame body 700 arranged in the upper layer packing area 600 is used for hanging the biofilm electrode 800, so that the attached biofilm provides a larger attachment area and a growing environment for microorganisms performing heterotrophic denitrification and autotrophic denitrification, the biofilm electrode 800 is horizontally arranged on the biofilm frame body 700, the biofilm electrode 800 is divided into an anode biofilm electrode 800 and a cathode biofilm electrode 800, the anode biofilm electrode 800 and a cathode biofilm electrode are alternately arranged, zeolite packing is filled between the biofilm electrodes 800, wherein the particle size of the zeolite is 5-8mm, the anode biofilm electrodes 800 are respectively connected in parallel with the anode of the power supply 400, the cathode biofilm electrodes 800 are respectively connected in parallel with the cathode of the power supply 400, gravel is arranged in the lower layer packing area 500, the particle size of the gravel is 15-30mm, and a water outlet 900 is arranged above the upper layer packing area 600.
The water distribution pipe 300 shown in fig. 2-4 comprises a main pipe 301 and a plurality of branch pipes 302 vertically welded on the upper pipe wall of the main pipe 301, the water outlet of the branch pipes 302 is provided with an anti-blocking device, the anti-blocking device comprises an anti-blocking support 303, a driving rotating shaft 304 penetrating through a cross at the lower end of the anti-blocking support 303, a rotating blade 305 welded on the driving rotating shaft 304 and a power blade 310 connected with the lower end of the driving rotating shaft 304 in a key manner, a sealing cavity 306 fixed on the anti-blocking support 303 and detachably connected with the upper cover, a driven rotating shaft 307 arranged above the sealing cavity 306, a rotating disk 308 welded on the driven rotating shaft 307 at the center and helical blades 309 symmetrically arranged along the axial direction of the rotating disk 308; a coaxial reverse mechanism is vertically arranged in the sealed cavity 306, the driving rotating shaft 304 is in key connection with a forward rotating shaft of the coaxial reverse mechanism, and one end of the driven rotating shaft 307, which is far away from the rotating disc 308, is in key connection with a reverse rotating shaft of the coaxial reverse mechanism; the helical blades 309 are fastened to the circumferential edge of the rotating disk 308 by bolts in the vertical direction, the number of the helical blades 309 is at least two, and at most four, and an annular ring is fixedly connected to one end of the helical blade 309 away from the rotating disk 308 for stabilizing the rotating blade 309.
After sewage is pumped into the water distribution pipe 300 through the water inlet pump, the sewage flows through the main pipe 301 and then flows into the artificial wetland above through each branch pipe 302 on the main pipe 301, an anti-blocking device is arranged at the water outlet of each branch pipe 302, the water flow pushes the power blade 310 to rotate, the power blade 310 drives the driving rotating shaft 304 and the rotating blade 305 welded on the driving rotating shaft 304 to rotate, the driving rotating shaft 304 drives the forward rotating shaft of the coaxial reverse rotation mechanism in the sealed cavity 306 to rotate, the forward bevel gear 3061 drives the transmission bevel gear 3062 and the auxiliary bevel gear 3064 to rotate, so as to drive the reverse bevel gear 3063 to rotate, therefore, the reverse rotating shaft of the coaxial reverse rotation mechanism rotates reversely relative to the rotating direction of the forward rotating shaft, because one end of the driven rotating shaft 307 far away from the rotating disc 308 is connected with the reverse rotating shaft of the coaxial reverse rotation mechanism, the center of the rotating disk 308 is welded on the driven rotating shaft 307, therefore, the driven rotating shaft 307 and the rotating disk 308 are driven by the reverse rotation circle to reversely rotate, so that the helical blades 309 connected to the circumferential edge of the rotating disk and the rotating blades 305 reversely rotate, sewage enters the artificial wetland from the rotating port, when the water outlet is blocked, as the water inlet pump keeps the water pumping working state unchanged, the water pressure in the main pipeline 301 is increased, the water flow entering the branch pipe 302 is increased, the thrust on the power blades 310 is larger, the helical blades 309 and the rotating blades 305 rotate faster, the relative reverse rotation is realized, the blockage of the rotating port can automatically fall off and is flushed away along with the water flow, and the reverse rotation structure can also prevent gravel of the bearing layer from falling into the rotating port.
Example 1:
a method for water treatment by coupling a rare earth reinforced biomembrane electrode with an artificial wetland comprises the following steps:
s1, collecting sludge from an anoxic tank of a sewage treatment plant, filtering impurities in the sludge by using a stainless steel filter screen, washing the sludge by using centrifugal water for three times, carrying out anaerobic culture for one week, regularly adding a nutrient solution, regularly stirring, and keeping the activity of the sludge, wherein the concentration of activated sludge (MLSS) is 12.5mg/L until the acclimation of the sludge is completed;
s2, adding the domesticated activated sludge to the vicinity of the rare earth reinforced biomembrane electrode of the wetland upper layer filler, starting an artificial wetland water inlet pump, pumping sewage into a water distribution pipe, keeping the pH value of inlet water at 7.5, keeping the nitrogen content (TN) concentration of the inlet water at 15mg/L, the Chemical Oxygen Demand (COD) concentration of organic pollutants at 52mg/L, and ammonia nitrogen pollutants (NH) 4 + -N) concentration of 4.6mg/L, nitrate nitrogen contaminant (NO) 3 - N) concentration of 10mg/l. Continuously operating in the artificial wetland, covering the biomembrane electrode with sewage, wherein the distance between the biomembrane electrodes is 100mm, performing biofilm formation, and periodically detecting the concentration of pollutants in the effluent of the test device until the biomembrane of the biomembrane electrode is successfully domesticated and the device stably operates;
and S3, turning on a power supply, controlling the voltage value to be 15V, electrifying for 4 hours, adjusting the distance between the biomembrane electrodes to be 100mm, maintaining the hydraulic retention time to be 10 hours, controlling the environmental temperature to be 25-30 ℃, and purifying the sewage through the artificial wetland.
Example 2:
a method for water treatment by coupling a rare earth reinforced biomembrane electrode with an artificial wetland comprises the following steps:
s1, collecting sludge from an anoxic tank of a sewage treatment plant, filtering impurities in the sludge by using a stainless steel filter screen, washing the sludge with centrifugal water for three times, carrying out anaerobic culture for one week, adding a nutrient solution at regular time, stirring the solution at regular time, and keeping the activity of the sludge, wherein the concentration of activated sludge (MLSS) is 12.5mg/L until the acclimation of the sludge is finished;
s2, adding the domesticated activated sludge to the vicinity of the rare earth reinforced biomembrane electrode of the wetland upper layer filler, starting an artificial wetland water inlet pump, pumping sewage into a water distribution pipe, keeping the pH value of inlet water at 7.5, keeping the nitrogen content (TN) concentration of the inlet water at 15mg/L, the Chemical Oxygen Demand (COD) concentration of organic pollutants at 52mg/L, and ammonia nitrogen pollutants (NH) 4 + -N) concentration of 4.6mg/L, nitrate nitrogen contaminant (NO) 3 - N) concentration of 10mg/l. Continuously running in the artificial wetland, covering the biomembrane electrode with sewage, wherein the distance between the biomembrane electrodes is 50mm, performing biofilm formation, and periodically detecting the concentration of pollutants in the effluent of the test device until the biomembrane of the biomembrane electrode is successfully domesticated and the device stably runs;
and S3, turning on a power supply, controlling the voltage value to be 12V, electrifying for 4 hours, adjusting the interval of the biomembrane electrode to be 80mm, maintaining the hydraulic retention time to be 8 hours, and purifying the sewage through the artificial wetland at the ambient temperature of 25-30 ℃.
Example 3:
a method for water treatment by coupling a rare earth reinforced biomembrane electrode with an artificial wetland comprises the following steps:
s1, collecting sludge from an anoxic tank of a sewage treatment plant, filtering impurities in the sludge by using a stainless steel filter screen, washing the sludge by using centrifugal water for three times, carrying out anaerobic culture for one week, regularly adding a nutrient solution, regularly stirring, and keeping the activity of the sludge, wherein the concentration of activated sludge (MLSS) is 12.5mg/L until the acclimation of the sludge is completed;
s2, adding the domesticated activated sludge to the vicinity of the rare earth reinforced biomembrane electrode of the wetland upper layer filler, starting an artificial wetland water inlet pump, and pumping sewage into the water distribution pumpThe pH value of inlet water is maintained at 7.5, the concentration of nitrogen content (TN) of the inlet water is 15mg/L, the concentration of Chemical Oxygen Demand (COD) of organic pollutants is 52mg/L, and ammonia nitrogen pollutants (NH) 4 + -N) concentration of 4.6mg/L, nitrate nitrogen contaminant (NO) 3 - N) concentration of 10mg/l. Continuously running in the artificial wetland, covering the biomembrane electrode with sewage, wherein the distance between the biomembrane electrodes is 150mm, performing biofilm formation, and periodically detecting the concentration of pollutants in the effluent of the test device until the biomembrane of the biomembrane electrode is successfully domesticated and the device stably runs;
and S3, turning on a power supply, controlling the voltage value to be 17V, electrifying for 4 hours, adjusting the distance between the biomembrane electrodes to be 120mm, maintaining the hydraulic retention time to be 12 hours, controlling the environmental temperature to be 25-30 ℃, and purifying the sewage through the artificial wetland.
Demonstration of experiments
1) Experimental raw water: the test water is subjected to simulated water distribution according to a first-class A standard;
2) Experimental equipment instrumentation: a ruler, a crucible, a constant-temperature incubator, an oven, a burette, a mortar, a muffle furnace, a vortex mixer, an electrophoresis apparatus, an ABLUe visible light nucleic acid gel detector, a biological electrophoresis image analysis system, a PCR (polymerase chain reaction) apparatus, an electrophoresis constant-temperature water bath (tank), an Eppendorf AG centrifuge, a high-throughput tissue grinder, a constant-temperature mixer and the like;
3) Experimental device: the main body of the test device is made of organic glass, the inner diameter of the main body is 144mm, the height of the main body is 480mm, and the volume of the main body is 7.8L. The water inlet is positioned in the center of the bottom of the device, the water passing direction is upward flow, and the water outlet is 50mm away from the top end of the device. The packing layer is divided into two layers, the upper layer zeolite (diameter is 5-8mm, thickness is 33 cm), the lower layer gravel bearing layer (diameter is 15-30mm, thickness is 10 cm), the electrode plate is a disc with diameter of 100mm and thickness of 3mm, and circular holes with diameter of 5mm (hole center-to-hole center distance is 10 mm) are distributed on the surface of the electrode, so that simulated wastewater can flow through the circular holes. Each device was planted with 3 uniform size of calamus. The cathode materials of the electrodes are graphite, the anode materials are graphite, aluminum and iron respectively, meanwhile, a conventional artificial wetland without a biomembrane electrode is built as a control group, 4 groups of artificial wetland systems are built, the electrode plates are placed in the vertical subsurface flow artificial wetland in parallel, the cathode plates are graphite plates, and the distance from the top end of the device is 280mm. The electrode is taken out by copper conductor (with insulating tape parcel processing), and the experimental apparatus is shown as figure 5, and the outer circuit is connected with copper conductor, and the copper line surface is lived with waterproof sticky tape and is prevented rustting, in will simulating test intake suction wetland through the peristaltic pump, continuously intakes, adjusts the velocity of flow through adjusting the peristaltic pump rotational speed. The electric energy of the electrode reaction is supplied to direct current by a direct current stabilized power supply (Hongkong Longwei, model PS-305DF,0-30v, 0-5A), the reaction condition of electrolysis can be changed by adjusting the current value, and the reaction time is directly controlled by a timer. The device is carried out in a laboratory environment at 25-30 ℃;
4) The experimental scheme is as follows: three sets of reactors shown in figure 5 and one set of conventional control group reactor are adopted, and the treatment effect of the reactor on sewage is observed by changing the space between the biomembrane electrodes, the connection voltage, the electrifying time and the hydraulic power stopping time so as to explore the treatment effect of the rare earth reinforced biomembrane electrode coupling artificial wetland reactor;
5) Membrane hanging culture: activated sludge used for biofilm culturing is from an anoxic tank of a certain municipal sewage treatment plant, the sludge is taken back, impurities in the sludge are filtered by a stainless steel filter screen (0.25 mm), the sludge is washed by deionized water for 3 times, then the sludge is subjected to anaerobic culture in a laboratory for a week, nutrient solution with the same proportion as that of artificial water distribution is added at regular time, and the sludge is stirred at regular time to keep the activity of the sludge; 1L of domesticated activated sludge (the MLSS concentration of the sludge is 12.5 g/L) is added into a reactor; continuously feeding water through a peristaltic pump, wherein the water feeding is artificial simulation water distribution (first-level A standard), and periodically detecting the concentration (TN and NH) of pollutants in the discharged water of the test device 4 + -N、NO 3 - N, COD), judging whether the biological membrane of the biological membrane electrode is successfully domesticated and whether the device stably operates;
6) The main influencing factors are as follows: the biomembrane electrode coupling artificial wetland reactor has various factors, such as temperature, biomembrane electrode plate spacing, current intensity, pollutant load, hydraulic retention time, hydraulic load, organic carbon source, toxic substances and the like, which influence the sewage treatment. Three main influence factors of the interval of the biomembrane electrode plates, the voltage intensity and the hydraulic retention time are mainly selected in the method; the three influencing factors adopt a univariate analysis method, only one parameter is changed in each group of experiments, and other parameters are kept unchanged. After each influence factor experiment is finished, the original variables are ensured to be the same as much as possible by replacing the raw water, and the water outlet result is measured after the stability is achieved.
7) The water quality indicators analyzed and the corresponding detection methods are shown in the following table:
water quality detection index and method
The experimental results are as follows:
influence of rare earth on electrode plate spacing of reinforced biological membrane
In the experiment, under the condition of fixed voltage, the influence of the distance between different rare earth reinforced biomembrane electrodes on current density is researched, so that the nitrogen removal efficiency of the whole biomembrane electrode coupling constructed wetland system is influenced, and four groups of distances of 200mm, 150mm, 100mm and 50mm are set;
the average value of the influent TN concentration during the whole test period is 15.66mg/L, and the influent NO 3 - Average concentration of-N of 10.37mg/L, feed water NH 4 + The average N concentration is 5.08mg/L, the TN concentration of the discharged water during the operation of 4 groups of electrodes with the distances of 200mm, 150mm, 100mm and 50mm is 7.08, 5.69, 4.36 and 4.49mg/L respectively, the corresponding removal rates are 55.96%, 63.25%, 72.38% and 70.61% respectively, the TN removal rate is in a change trend of increasing first and then decreasing along with the increase of the electrode distances and reaches the maximum value at the time of 100 mm; NO of effluent 3 - N concentrations of 0.18, 0.07, 0.04 and 0.04mg/L, corresponding removal rates of 98.33%, 99.34%, 99.65% and 99.63%, respectively, and NO 3 - The N removal rate shows a trend of increasing and then tending to be stable along with the increase of the electrode spacing, NO difference exists between 100mm and 50mm, the N removal rate is higher than 200mm and 150mm, but the difference is not obvious, and NO is generated under the condition of 4 groups of electrode spacing 3 - The removal rate of-N reaches more than 98 percent, and the effluent NO of the system 3 - -N is not accumulated; effluent NH 4 + N concentrations of 2.54, 2.41, 2.53 and 3.28mg/L, respectively, corresponding to removal rates of 52.46% and 5%, respectively1.52％、49.23％And 34.85% NH 4 + The N removal rate has a gradually decreasing trend along with the increase of the electrode spacing, and under the condition of a fixed voltage, the current density gradually increases along with the decrease of the electrode spacing, namely the current density is larger along with the decrease of the electrode spacing, so that the nitrogen removal efficiency and the current density of the biomembrane electrode-artificial wetland coupling system are closely related. The reduction of nitrate nitrogen increased with increasing current density, but at the same time resulted in an increase in ammonia nitrogen, so the optimum electrode spacing for this test was 100mm.
Influence of the intensity of the voltage
The research of the experiment is that under the condition of fixing the space between the biomembrane electrodes, the different voltage values are opposite to the effluent pollutants (TN and NO) 3 - -N、NH 4 + N), five sets of voltage values 5V, 10V, 15V, 20V, 30V were set for this experiment.
During the whole test period, the average value of the concentration of the inlet water TN is 15.18mg/L, and the inlet water NO is 3 - Average concentration of-N of 10.76mg/L, feed water NH 4 + The average concentration of N is 4.55mg/L, the average concentration of TN of outlet water of the rare earth reinforced biomembrane electrode coupling artificial wetland system is 5.61, 5.52, 4.34, 3.25 and 2.67mg/L under different voltage conditions (5, 10, 15, 20 and 30V), and the TN gradually decreases with the increase of voltage. With the increase of the voltage gradient, the mean values of the TN removal rates are respectively 64.00%, 63.44%, 71.58%, 77.67% and 82.50%, and the TN removal rates have gradually increasing change trends, but when the TN removal rates are increased to 15V, the change rates are slowed down; NO for system water outlet 3 - The average N concentration is 4.61, 4.59, 2.67, 2.64 and 2.31mg/L respectively, and the average N concentration is gradually reduced along with the increase of the voltage. With increasing voltage gradient, NO 3 - The average N removal rates are respectively 58.74%, 57.91%, 75.66%, 74.96% and 76.03%, and the average N removal rates show a gradually-smooth trend after increasing, and basically do not change when increasing to 15V; system effluent NH 4 + The average N concentration is 0.80, 1.46, 0.78, 0.88 and 0.92mg/L respectively, and the average N concentration is in a change trend of increasing, then decreasing and then stabilizing along with the increase of the voltage. With increasing voltage gradient, NH 4 + -average of N removal79.99 percent, 70.24 percent, 83.96 percent, 78.72 percent and 80.20 percent respectively, which show the change trend of descending first, then rising and then tending to be stable, and reach the maximum value at 15V; in the electrolysis strengthening horizontal subsurface flow constructed wetland, the current density is increased along with the increase of the current density, although a certain nitrate nitrogen reduction amount can be increased, byproducts with higher concentration are generated at the same time. Therefore, 15V is an optimum voltage in combination with the reduction characteristics of nitrate nitrogen and the amount of by-products generated.
Effect of Hydraulic Retention Time (HRT)
The research of the experiment is that under the conditions of fixed biomembrane electrode spacing, fixed voltage value and electrifying time and in different hydraulic retention time, the effluent pollutants (TN and NO) of four groups of artificial wetland devices 3 - -N、NH 4 + -N) concentration.
With the increase of HRT, the TN concentration of the effluent of the four groups of artificial wetland devices is in a gradually-decreasing change trend, the TN concentration of the effluent of the 3 groups of biomembrane electrode-artificial wetland coupling devices is lower than that of a control group, and the TN concentration of the effluent of the E-Fe group is lower than that of the effluent of the other two groups of coupling devices; when HRT is increased from 6h to 10h, TN concentration of outlet water of the CK, E-C, E-Al and E-Fe four groups of artificial wetland devices is respectively reduced from 9.84, 5.25, 5.85 and 4.93mg/L to 7.39, 4.04, 4.44 and 3.23mg/L, and corresponding removal rates are respectively increased from 36.88%, 66.32%, 62.47% and 68.40% to 52.01%, 73.78%, 71.22% and 79.04%. But as the HRT is continuously increased from 10h to 24h, the TN concentration of the HRT is respectively reduced from 7.39, 4.04, 4.44 and 3.23mg/L to 5.86, 3.65, 4.10 and 3.06mg/L, the corresponding removal rates are respectively increased from 52.01%, 73.78%, 71.22% and 79.04% to 61.84%, 76.22%, 73.29% and 80.07%, and the increase rate of the TN removal rate is slowed down, and particularly, the TN removal rate is not substantially changed for 3 groups of coupling systems; with the increase of HRT, the four groups of artificial wetland devices produce NO water 3 - The concentration change trend of the-N is the same as that of TN and is gradually reduced, and when HRT is increased from 6h to 24h, the effluent NO of four groups of artificial wetland devices, namely CK, E-C, E-Al and E-Fe 3 - The N concentration is respectively reduced from 6.02, 3.73, 4.03 and 3.54mg/L to 2.83, 0.16, 0.53 and 0.09mg/L, and the corresponding removal rates are respectively 42.39%, 64.32%, 61.50% and 66.19%Increasing to 72.66%, 98.45%, 94.93% and 99.18%, but when the HRT of the three groups of biomembrane electrode-artificial wetland coupling devices (E-C, E-Al and E-Fe) is 10h, the TN removal rate reaches 85.22%, 84.83% and 93.75%, the HRT is continuously increased to 24h, and the increase amplitude is small; when HRT is increased from 6h to 24h, the effluent NH of the four groups of artificial wetland devices of CK, E-C, E-Al and E-Fe 4 + The N concentration increased from 1.03, 1.41, 1.52 and 1.22mg/L to 2.43, 2.62, 2.87 and 2.54mg/L, respectively, and the corresponding removal rates decreased from 79.33%, 71.70%, 69.60% and 75.52% to 50.66%, 46.79%, 41.61% and 48.428%, respectively.
The conclusion is as follows: when the electrode spacing is 100mm, the nitrogen removal efficiency is highest, the nitrogen removal efficiency is the same as the electrode arrangement form and is related to the current magnitude, and the current is gradually reduced along with the electrode spacing reduction under the same voltage condition; the TN removal rate shows a gradually increasing change trend along with the increase of the voltage, but when the TN removal rate is increased to 15V, the change rate is slowed down, and NH is synthesized 4 + -N and NO 3 - -N, preferably at a voltage of 15V; along with the increase of the power-on time, the TN removal rate is in a stable change trend after gradually increasing, and the power-on time is preferably 4h according to the analysis of related energy consumption; as the energization time variation trend is the same, when the energization time variation trend is increased to 10h, the lift rate is slowed down, and therefore, the HRT is preferably 10h. The device provided by the invention has the advantages of simple structure, convenience in operation and better treatment effect.
While there have been shown and described what are at present considered to be the basic principles and essential features of the invention and advantages thereof, it will be apparent to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, but is capable of other embodiments without departing from the spirit or essential characteristics thereof; the present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. The utility model provides a tombarthite strengthening biological membrane electrode coupling constructed wetland, includes the wetland main part, plants the purification plant in the wetland, establishes the water distributor and external power supply in wetland main part bottom, its characterized in that:
further comprising:
the lower layer filling area is arranged above the water distribution pipe and is used for supporting layer filling;
an upper layer filling region arranged in the lower layer filling region;
the biomembrane frame body arranged in the upper layer filler area is used for hanging the rare earth reinforced biomembrane electrode, so that the attached biomembrane provides larger attachment area and growing environment for the microorganisms for heterotrophic denitrification and autotrophic denitrification.
2. The rare earth reinforced biomembrane electrode coupling artificial wetland according to claim 1, characterized in that: the preparation process of the rare earth reinforced biomembrane electrode comprises the following steps: preparing 0.5mol/L lanthanum chloride solution, soaking the iron biomembrane electrode and the graphite biomembrane electrode in the prepared lanthanum chloride solution, taking out after 7 days, naturally drying, repeating the steps for the second time of loading, and modifying the biomembrane electrode for three times.
3. The rare earth reinforced biomembrane electrode coupling artificial wetland according to claim 1, characterized in that: the water distribution pipe comprises a main pipe and a plurality of branch pipes vertically and fixedly arranged on the upper pipe wall of the main pipe, an anti-blocking device is arranged at a water outlet of each branch pipe, and the anti-blocking device comprises an anti-blocking support, a driving rotating shaft penetrating through a cross at the lower end of the anti-blocking support, rotating blades fixedly connected to the driving rotating shaft, power blades at the lower end of the driving rotating shaft, a sealing cavity fixed on the anti-blocking support and detachably connected with an upper cover, a driven rotating shaft arranged above the sealing cavity, a rotating disk with the center fixed on the driven rotating shaft and spiral blades symmetrically arranged along the axial direction of the rotating disk;
a coaxial reverse mechanism is vertically arranged in the sealing cavity, the driving rotating shaft is fixedly connected with a forward rotating shaft of the coaxial reverse mechanism, and one end of the driven rotating shaft, which is far away from the rotating disc, is fixedly connected with a reverse rotating shaft of the coaxial reverse mechanism;
the spiral blades are fixedly arranged at the circumferential edge of the rotating disk along the vertical direction, the number of the spiral blades is at least two, at most four, and a circular ring is fixedly arranged at one end, far away from the rotating disk, of each spiral blade.
4. The rare earth reinforced biomembrane electrode coupling artificial wetland according to claim 1, characterized in that: the biomembrane bracket is fixedly provided with more than two biomembrane electrodes which are vertically distributed on the biomembrane bracket and are parallel to each other.
5. The rare earth reinforced biomembrane electrode coupling artificial wetland according to claim 4, characterized in that: the biomembrane electrode is horizontally arranged on the biomembrane frame body and is divided into an anode biomembrane electrode and a cathode biomembrane electrode, the anode biomembrane electrode and the cathode biomembrane electrode are alternately arranged, zeolite filler is filled between the biomembrane electrodes, and the particle size of the zeolite is 5-8mm.
6. The rare earth reinforced biomembrane electrode coupling constructed wetland according to claim 5, characterized in that: the anode biomembrane electrodes are respectively connected in parallel with the anode of the power supply, and the cathode biomembrane electrodes are respectively connected in parallel with the cathode of the power supply.
7. The rare earth reinforced biomembrane electrode coupling artificial wetland according to claim 1, characterized in that: gravel is arranged in the lower-layer packing area, the particle size of the gravel is 15-30mm, and a water outlet is formed above the upper-layer packing area.
8. A method for performing water treatment by adopting the rare earth reinforced biomembrane electrode coupled artificial wetland of claim 1 comprises the following steps:
s1, collecting sludge from an anoxic tank of a sewage treatment plant, filtering impurities in the sludge by using a stainless steel filter screen, washing the sludge with centrifugal water for three times, carrying out anaerobic culture for one week, adding a nutrient solution at regular time, and stirring at regular time to keep the activity of the sludge until the acclimation of the sludge is completed;
s2, adding the domesticated activated sludge to the vicinity of a rare earth reinforced biomembrane electrode of the wetland upper-layer filler, starting an artificial wetland water inlet pump, pumping sewage into a water distribution pipe, continuously operating in the artificial wetland, covering the biomembrane electrode with the sewage, performing biofilm formation, and periodically detecting the concentration of pollutants in the effluent of the test device until the biomembrane of the biomembrane electrode is successfully domesticated and the device stably operates;
and S3, turning on a power supply, controlling the voltage value to be 12-17V, electrifying for 2-6 hours, adjusting the interval of the biomembrane electrode to be 80-120 mm, maintaining the hydraulic retention time to be 8-12 hours, keeping the environment temperature to be 25-30 ℃, and purifying the sewage through the artificial wetland.
9. The method for water treatment by coupling the rare earth reinforced biomembrane electrode and the constructed wetland according to claim 8, wherein the method comprises the following steps: the concentration of the activated sludge (MLSS) in the step S1 is 10-15mg/L.
10. The method for water treatment by coupling the rare earth reinforced biomembrane electrode and the artificial wetland according to claim 8, is characterized in that: in the step S4, the concentration of the nitrogen content (TN) of the inlet water is 14-18mg/L, the concentration of the Chemical Oxygen Demand (COD) of the organic pollutants is 50-60mg/L, and the concentration of the ammonia nitrogen pollutants (NH) 4 + -N) concentration of 3-8mg/L, nitrate nitrogen contaminant (NO) 3 - -N) concentration of 6-15mg/l.
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| CN204877976U (en) * | 2015-08-05 | 2015-12-16 | 枞阳县宇瑞环保科技有限公司 | Propeller pump is blockked up to high -efficient nothing |
| CN110407324A (en) * | 2019-07-04 | 2019-11-05 | 大连海洋大学 | A kind of biological membrane electrode coupling constructed wetland reactor and its sewage water treatment method |
| US20210009450A1 (en) * | 2019-07-12 | 2021-01-14 | Dalian University Of Technology | Method for changing filler pollutant accumulation of constructed wetland |
| CN111425410A (en) * | 2020-03-30 | 2020-07-17 | 河北领启机械设备有限公司 | Submersible slurry pump with inlet anti-blocking protection device and use method thereof |
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| CN113021638A (en) * | 2021-04-06 | 2021-06-25 | 李俊侠 | Coaxial reverse rotation's cement paste anti-solidification agitating unit for construction |
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