CN112266140A - Constructed wetland biomembrane coupling iron-carbon micro-electrolysis filler - Google Patents
Constructed wetland biomembrane coupling iron-carbon micro-electrolysis filler Download PDFInfo
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- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F2101/105—Phosphorus compounds
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- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- 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
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- 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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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a constructed wetland biofilm-coupled iron-carbon microelectrolysis filler, which comprises an iron-carbon microelectrolysis filler and a biofilm filler, wherein the iron-carbon microelectrolysis filler and the biofilm filler are coupled to form a biofilm-coupled iron-carbon electrolysis module, the upper layer of the biofilm-coupled iron-carbon electrolysis module is an iron-carbon microelectrolysis filler layer, the lower layer of the biofilm-coupled iron-carbon electrolysis module is a biofilm filler layer, and the iron-carbon microelectrolysis filler is composed of steel sludge, coconut shells, bacterial cellulose waste, bentonite, soluble starch and lanthanum chloride. Meanwhile, the cold resistance of the system is improved, and the application of the artificial wetland in the northern cold area is widened.
Description
Technical Field
The invention relates to the technical field of artificial wetlands, in particular to an artificial wetland biofilm coupling iron-carbon micro-electrolysis filler.
Background
The artificial wetland is a wetland similar to a marshland constructed by artificially constructing and controlling the operation, sewage and sludge are controllably dosed to the artificially constructed wetland, and the sewage and the sludge mainly utilize the triple synergistic effects of soil, artificial media, plants and microorganisms, chemistry and biology in the process of flowing along a certain direction to treat the sewage and the sludge.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the existing defects, and provide the constructed wetland biofilm coupling iron-carbon micro-electrolysis filler, which is convenient for solving the problem that the constructed wetland is easy to block, is convenient for removing organic matters, total nitrogen and total phosphorus in an constructed wetland system, has strong practicability, and can effectively solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a constructed wetland biomembrane coupling iron carbon micro-electrolysis filler, includes iron carbon micro-electrolysis filler and biomembrane filler, iron carbon micro-electrolysis filler with biomembrane filler coupling constitution biomembrane coupling iron carbon electrolysis module, the upper strata of biomembrane coupling iron carbon electrolysis module is iron carbon micro-electrolysis filler layer, the lower floor of biomembrane coupling iron carbon electrolysis module is the biomembrane filler layer, iron carbon micro-electrolysis filler comprises steel and iron mud, coconut shell, bacterial cellulose waste, bentonite, soluble starch and lanthanum chloride, the biomembrane filler comprises gabion, aeration pipe and ackerman ecological base.
As a preferable technical scheme of the invention, the volume ratio of the iron-carbon microelectrolysis filler layer to the biomembrane filler in the biomembrane coupling iron-carbon electrolysis module is 1/2-2/3, and the particle size of the filler in the iron-carbon microelectrolysis filler layer is 2-5 mm.
As a preferred technical scheme of the invention, the preparation method of the iron-carbon micro-electrolysis filler comprises the following steps:
step 1: pretreatment of the steel sludge: drying the steel sludge at 105 ℃, then crushing and grinding the steel sludge, finally screening the steel sludge by a 100-mesh sample separation sieve, and taking the part under the sieve for later use;
step 2: preparing biochar: cleaning coconut shells and bacterial cellulose waste materials, drying at 50 ℃, mixing the dried coconut shells and the bacterial cellulose waste materials in a weight ratio of 1-2: 1, placing the mixture in a muffle furnace, and carbonizing at 500-1000 ℃ for 2-4h to prepare biochar;
and step 3: preparing the iron-carbon micro-electrolysis filler: preparing pretreated steel sludge, biochar, bentonite and soluble starch into raw material balls with the diameter of 2-4mm according to the proportion of 1: 1-3: 0.5: 0.1-0.2, naturally drying the biological balls, putting the naturally dried biological balls into a drying oven with the temperature of 105 ℃ for drying for 1-2h, cooling the dried biological balls to room temperature, putting the biological balls into a muffle furnace for roasting at the temperature of 800-, and (3) cleaning the iron-carbon micro-electrolysis filler by using clean water to be neutral, drying the iron-carbon micro-electrolysis filler to finish a complete preparation cycle, taking the iron-carbon micro-electrolysis filler treated in the first cycle as a carrier in the second cycle, and repeating the operation processes in the third cycle by repeating the steps for 3-5 times to finally prepare the iron-carbon micro-electrolysis filler.
As a preferred technical scheme, the constructed wetland biofilm coupling iron-carbon micro-electrolysis filler comprises an organic glass box body, a first baffle and a second baffle are respectively arranged on the left side and the right side of the bottom of an inner cavity of the organic glass box body in a returning mode, a first gabion is arranged in the inner cavity of the organic glass box body and positioned on the right side of the first baffle, gravel fillers are filled in the first gabion, a second gabion is arranged in the inner cavity of the organic glass box body and positioned on the left side of the second baffle, zeolite fillers are filled in the second gabion, the iron-carbon micro-electrolysis filler and the biofilm filler are sequentially arranged between the first gabion and the second gabion from top to bottom, the bottom of the biofilm filler is connected with a counterweight, and an aeration pipe is arranged at the bottom of the inner cavity of the organic glass box body and positioned below the biofilm filler.
As a preferred technical scheme, a water inlet is formed in the position, close to the top, of the left end face of the organic glass box body, and a water outlet is formed in the position, close to the bottom, of the right end face of the organic glass box body.
As a preferable technical scheme of the invention, the counterweight is a stainless steel pendant.
As a preferable technical scheme of the invention, a first ecological purifying plant is planted on the upper part of the gravel filler in the first gabion.
According to a preferable technical scheme of the invention, a second ecological purification plant is planted in the zeolite filling part of the second gabion.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention improves the traditional artificial wetland, solves the problem of blockage of the artificial wetland by embedding the biomembrane coupling iron carbon electrolysis module in the artificial wetland, and in addition, not only enhances the removal of organic matters, total nitrogen and total phosphorus by the artificial wetland system through the biomembrane coupling iron carbon electrolysis module, but also increases the cold resistance of the system and widens the application of the artificial wetland in the northern cold region;
2. the bacterial cellulose waste materials and other composition substances in the iron-carbon micro-electrolysis filler provided by the invention enable the filler to be porous and not easy to block, and have strong acid and alkali resistance, stability and nitrogen and phosphorus removal performance;
3. the iron-carbon micro-electrolysis filler can form a micro-electric field in a system, provides enough electrons for reducing nitrate nitrogen for microbial communities of artificial wetlands, and organic matters dissolved by biochar in the iron-carbon micro-electrolysis filler can promote enrichment of denitrifying microorganisms;
4. in the iron-carbon micro-electrolysis filler system, iron ions and rare earth lanthanum ions can form stable complex precipitates with phosphorus, so that the phosphorus can be stabilized in the filler for a long time, and secondary pollution caused by dissolution of pollutant phosphorus into a water body is avoided.
Drawings
FIG. 1 is a schematic structural diagram of a biofilm-coupled iron-carbon microelectrolytic filler of the present invention;
FIG. 2 is a schematic diagram of an application structure of the biofilm-coupled iron-carbon microelectrolysis filler.
In the figure: the device comprises a water inlet 1, a gravel filler 2, an organic glass box body 3, a first baffle plate 4, a first plant for ecological purification 5, a second plant for ecological purification 6, an iron-carbon micro-electrolysis filler 7, a zeolite filler 8, a second baffle plate 9, a first gabion 10, an aeration pipe 11, a counterweight 12, a biomembrane filler 13 and a water outlet 14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: an artificial wetland biomembrane coupling iron-carbon microelectrolysis filler comprises an iron-carbon microelectrolysis filler 7 and a biomembrane filler 13, the iron-carbon microelectrolysis filler 7 and the biomembrane filler 13 are coupled to form a biomembrane coupling iron-carbon electrolysis module, the upper layer of the biomembrane coupling iron-carbon electrolysis module is an iron-carbon microelectrolysis filler layer, the lower layer of the biomembrane coupling iron-carbon electrolysis module is a biomembrane filler layer, the iron-carbon microelectrolysis filler 7 is made of steel sludge, coconut shells and bacterial cellulose waste materials, bentonite, soluble starch and lanthanum chloride, wherein the biomembrane filler 13 comprises a gabion, an aerator pipe and an Ackerman ecological base, the volume ratio of an iron-carbon micro-electrolysis filler layer to a biomembrane filler layer in the biomembrane coupling iron-carbon electrolysis module is 1/2-2/3, the particle size of the filler in the iron-carbon micro-electrolysis filler layer is 2-5mm, and the waste material of the bacterial cellulose is mainly waste gauze.
The preparation method of the iron-carbon micro-electrolysis filler 7 comprises the following steps:
step 1: pretreatment of the steel sludge: drying the steel sludge at 105 ℃, then crushing and grinding the steel sludge, finally screening the steel sludge by a 100-mesh sample separation sieve, and taking the part under the sieve for later use;
step 2: preparing biochar: cleaning coconut shells and bacterial cellulose waste materials, drying at 50 ℃, mixing the dried coconut shells and the bacterial cellulose waste materials in a weight ratio of 1-2: 1, placing the mixture in a muffle furnace, and carbonizing at 500-1000 ℃ for 2-4h to prepare biochar;
and step 3: preparation of iron-carbon micro-electrolysis filler 7: preparing pretreated steel sludge, biochar, bentonite and soluble starch into raw material balls with the diameter of 2-4mm according to the proportion of 1: 1-3: 0.5: 0.1-0.2, naturally drying the biological balls, putting the naturally dried biological balls into a drying oven with the temperature of 105 ℃ for drying for 1-2h, cooling the dried biological balls to room temperature, putting the biological balls into a muffle furnace for roasting at the temperature of 800-, and (3) cleaning the iron-carbon micro-electrolysis filler by using clean water to be neutral, drying the iron-carbon micro-electrolysis filler to finish a complete preparation cycle, taking the iron-carbon micro-electrolysis filler treated in the first cycle as a carrier in the second cycle, and repeating the operation processes in the third cycle by repeating the steps for 3 to 5 times to finally prepare the iron-carbon micro-electrolysis filler 7.
In order to better understand the invention, the biomembrane coupling iron-carbon electrolysis module is arranged in the artificial wetland, a set of novel artificial wetland device is constructed, and the invention is further clarified by combining with the embodiment.
The artificial wetland biofilm coupling iron-carbon micro-electrolysis filler comprises an organic glass box body 3, wherein a first baffle 4 and a second baffle 9 are respectively arranged on the left side and the right side of the bottom of an inner cavity of the organic glass box body 3 in a returning mode, a first gabion 10 is arranged in the inner cavity of the organic glass box body 3 and positioned on the right side of the first baffle 4, gravel fillers 2 are filled in the first gabion 10, a second gabion is arranged in the inner cavity of the organic glass box body 3 and positioned on the left side of the second baffle 9, zeolite fillers 8 are filled in the second gabion, an iron-carbon micro-electrolysis filler 7 and a biofilm filler 13 are sequentially arranged between the first gabion 10 and the second gabion from top to bottom, the bottom of the biofilm filler 13 is connected with an aerator pipe 11, a counterweight 1 is arranged at the position, close to the top, of the left end face of the organic glass box body 3, and a water outlet 14 is arranged at the, the weight 12 is a stainless steel pendant, a first ecological purification plant 5 is planted on the upper portion of the gravel filler 2 in the first gabion 10, and a second ecological purification plant 6 is planted on the 8 portion of the zeolite filler in the second gabion.
Description of the constructed wetland device: the artificial wetland device consists of an organic glass box body 3, the organic glass box body 3 is 120cm x 60cm, the artificial wetland device sequentially comprises a water inlet tank, a gravel zone, a biomembrane coupling iron-carbon electrolysis zone, a zeolite zone and a water outlet tank from left to right, the water inlet tank is a cavity formed between a baffle I4 and the machine glass box body 3, the gravel zone is gravel filler 2 filled in a gabion I10, the biomembrane coupling iron-carbon electrolysis zone is a biomembrane coupling iron-carbon electrolysis module formed by iron-carbon microelectrolysis filler 7 and biomembrane filler 13, the zeolite zone is zeolite filler 8 filled in a gabion II, the water outlet tank is a cavity formed between a baffle II 9 and the machine glass box body 3, the volume ratio is 1: 2: 8: 2: 1, the water inlet is 30cm from bottom to 1, the water outlet is 10cm from bottom to 14 cm, the baffle I4 is 55cm high, the baffle II 9 is 50cm high, the gravel zone, the biomembrane coupling iron-, The zeolite area is arranged at the same height, the distance from the bottom of the zeolite area to the bottom of the zeolite area is 48cm, the gravel area and the zeolite area are used for planting a first plant 5 for ecological purification, such as acorus calamus, and the biomembrane coupling iron-carbon electrolysis area is used for planting a second plant 6 for ecological purification, such as canna.
Description of the test: the tail water of sewage plants in a certain city is selected as test inlet water, the concentration of the pollutant NH3-N in the inlet water is 3-5mg/L, TN, the concentration of the pollutant NH3-N in the inlet water is 10-15mg/L, TP, the concentration of the pollutant NH3-N in the inlet water is 0.4-0.5mg/L, the operation is carried out in a continuous water inlet mode, HRT (HRT) is 24 hours, the concentration of NH3-N, TN and TP in the water are measured continuously for one month by adopting a national standard method, and the average value is.
Example 1:
step 1: pretreatment of the steel sludge: drying the steel sludge at 105 ℃, then crushing and grinding the steel sludge, finally screening the steel sludge by a 100-mesh sample separation sieve, and taking the part under the sieve for later use;
step 2: preparing biochar: cleaning coconut shells and bacterial cellulose waste materials, drying at 50 ℃, mixing the dried coconut shells and the bacterial cellulose waste materials in a weight ratio of 1.5: 1, placing the mixture in a muffle furnace, and carbonizing for 3 hours at 600 ℃ to prepare biochar;
and step 3: preparing the iron-carbon micro-electrolysis filler: preparing pretreated steel sludge, biochar, bentonite and soluble starch into raw material balls with the diameter of 3mm according to the proportion of 1: 0.5: 0.15, naturally drying the biochar, putting the naturally dried biochar into a drying oven at 105 ℃ for drying for 1.5h, cooling the dried biochar to room temperature, putting the biosphere into a muffle furnace for roasting at 900 ℃ for 35min, obtaining a semi-finished product of the iron-carbon micro-electrolysis filler after roasting and cooling, putting the semi-finished product of the iron-carbon micro-electrolysis filler and lanthanum chloride into a heat-resistant vessel, wherein n (iron) and n (lanthanum) are 0.08, stirring to fully contact the materials, slowly dripping NaOH, adjusting the pH value to 11, then moving the heat-resistant vessel into a constant temperature oven, keeping the temperature at 105 ℃ for fully reacting for 3h, finally taking out a sample in the heat-resistant vessel, cooling the sample to be neutral by using clear water, drying, and finishing a complete preparation period, the iron-carbon micro-electrolysis filler treated in the first period is used as a carrier in the second period, other operation methods are the same, the operation process in the third period is analogized, and the iron-carbon micro-electrolysis filler is finally prepared through 4 cycles.
The biomembrane coupling iron-carbon electrolysis zone adopts the biomembrane coupling iron-carbon electrolysis filler prepared in the example 1, the volume ratio of the iron-carbon micro-electrolysis filler layer to the biomembrane filler layer in the biomembrane coupling iron-carbon electrolysis zone is 1/2, and the aeration mode adopts intermittent aeration.
The water quality of the effluent of an experimental water body after passing through the constructed wetland device containing the biofilm-coupled iron-carbon electrolytic filler prepared in example 1 is as follows: NH3-N, TN and TP were 1.08mg/L, 1.31mg/L and 0.22mg/L, respectively.
Example 2:
preparation of iron-carbon micro-electrolysis filler according to the operation steps of the embodiment 1, only the following are changed: the addition ratio of the pretreated steel sludge, the biochar, the bentonite and the soluble starch is 1: 2: 0.5: 0.15, the biomembrane coupling iron-carbon electrolysis region adopts the biomembrane coupling iron-carbon electrolysis filler prepared in the embodiment 2, the volume ratio of the iron-carbon micro-electrolysis filler layer and the biomembrane filler layer in the biomembrane coupling iron-carbon electrolysis region is 1/2, and the aeration mode adopts intermittent aeration.
The water quality of the effluent of an experimental water body after passing through the constructed wetland device containing the biofilm-coupled iron-carbon electrolytic filler prepared in example 2 is as follows: NH3-N, TN and TP were 0.50mg/L, 0.82mg/L and 0.06mg/L, respectively.
Example 3:
preparation of iron-carbon micro-electrolysis filler according to the operation steps of the embodiment 1, only the following are changed: the addition ratio of the pretreated steel sludge, the biochar, the bentonite and the soluble starch is 1: 3: 0.5: 0.15, the biomembrane coupling iron-carbon electrolysis region adopts the biomembrane coupling iron-carbon electrolysis filler prepared in the embodiment 3, the volume ratio of the iron-carbon micro-electrolysis filler layer and the biomembrane filler layer in the biomembrane coupling iron-carbon electrolysis region is 1/2, and the aeration mode adopts intermittent aeration.
The water quality of the effluent of an experimental water body after passing through the constructed wetland device containing the biofilm-coupled iron-carbon electrolytic filler prepared in example 3 is as follows: NH3-N, TN and TP were 0.86mg/L, 1.05mg/L and 0.03mg/L, respectively.
Example 4:
preparation of iron-carbon micro-electrolysis filler according to the operation steps of the embodiment 1, only the following are changed: the addition ratio of the pretreated steel sludge, the biochar, the bentonite and the soluble starch is 1: 2: 0.5: 0.15, the biomembrane coupling iron-carbon electrolysis region adopts the biomembrane coupling iron-carbon electrolysis filler prepared in the embodiment 4, the volume ratio of the iron-carbon micro-electrolysis filler layer and the biomembrane filler layer in the biomembrane coupling iron-carbon electrolysis region is 2/3, and the aeration mode adopts intermittent aeration.
The water quality of the effluent of an experimental water body after passing through the constructed wetland device containing the biofilm-coupled iron-carbon electrolytic filler prepared in example 4 is as follows: NH3-N, TN and TP were 0.94mg/L, 1.23mg/L and 0.05mg/L, respectively.
Example 5:
preparation of iron-carbon micro-electrolysis filler according to the operation steps of the embodiment 1, only the following are changed: the addition ratio of the pretreated steel sludge, the biochar, the bentonite and the soluble starch is 1: 2: 0.5: 0.15, the biomembrane coupling iron-carbon electrolysis region adopts the biomembrane coupling iron-carbon electrolysis filler prepared in the embodiment 5, the volume ratio of the iron-carbon micro-electrolysis filler layer and the biomembrane filler layer in the biomembrane coupling iron-carbon electrolysis region is 1/2, and the aeration mode adopts continuous aeration.
The water quality of the effluent of an experimental water body after passing through the constructed wetland device containing the biofilm-coupled iron-carbon electrolytic filler prepared in example 5 is as follows: NH3-N, TN and TP were 0.48mg/L, 0.98mg/L and 0.04mg/L, respectively.
In conclusion, the higher the proportion of the steel sludge in the filler is, the better the phosphorus removal effect of the system of the artificial wetland device is, but the higher the proportion of the steel sludge can reduce the ammonia nitrogen removal effect, so that the comprehensive nitrogen and phosphorus removal effect is the best when the artificial wetland device is prepared according to the proportion of the pretreated steel sludge, the biochar, the bentonite and the soluble starch of 1: 2: 0.5: 0.15;
secondly, the volume ratio of the iron-carbon micro-electrolysis filler layer to the biological film filler layer in the biological film coupling iron-carbon electrolysis area is 1/2, the system has the best effect of removing nitrogen and phosphorus, and more iron-carbon micro-electrolysis fillers 7 provide richer survival conditions for the biological film filler microorganisms;
thirdly, the system has the best nitrogen removal effect by adopting an intermittent aeration mode, and the mode provides a more appropriate growth environment for aerobic and anaerobic microorganisms of the system of the artificial wetland device, so that the action of the microorganisms of the system in the nitrification and denitrification process is improved;
fourthly, the influence of the factors is sequentially the proportion of the iron-carbon filler, the volume ratio of the iron-carbon micro-electrolysis filler layer to the biological film filler layer and the aeration mode.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The artificial wetland biofilm coupling iron-carbon micro-electrolysis filler is characterized in that: the iron-carbon microelectrolysis filler and the biomembrane filler are coupled to form a biomembrane coupling iron-carbon electrolysis module, the upper layer of the biomembrane coupling iron-carbon electrolysis module is an iron-carbon microelectrolysis filler layer, the lower layer of the biomembrane coupling iron-carbon electrolysis module is a biomembrane filler layer, the iron-carbon microelectrolysis filler is composed of steel sludge, coconut shells, bacterial cellulose waste, bentonite, soluble starch and lanthanum chloride, and the biomembrane filler is composed of a gabion, an aeration pipe and an Ackerman ecological base.
2. The constructed wetland biofilm coupled iron-carbon micro-electrolysis filler according to claim 1, which is characterized in that: the volume ratio of the iron-carbon micro-electrolysis filler layer to the biological film filler layer in the biological film coupling iron-carbon electrolysis module is 1/2-2/3, and the particle size of the filler in the iron-carbon micro-electrolysis filler layer is 2-5 mm.
3. The constructed wetland biofilm coupled iron-carbon micro-electrolysis filler according to claim 1, which is characterized in that: the preparation method of the iron-carbon micro-electrolysis filler comprises the following steps:
step 1: pretreatment of the steel sludge: drying the steel sludge at 105 ℃, then crushing and grinding the steel sludge, finally screening the steel sludge by a 100-mesh sample separation sieve, and taking the part under the sieve for later use;
step 2: preparing biochar: cleaning coconut shells and bacterial cellulose waste materials, drying at 50 ℃, mixing the dried coconut shells and the bacterial cellulose waste materials in a weight ratio of 1-2: 1, placing the mixture in a muffle furnace, and carbonizing at 500-1000 ℃ for 2-4h to prepare biochar;
and step 3: preparing the iron-carbon micro-electrolysis filler: preparing pretreated steel sludge, biochar, bentonite and soluble starch into raw material balls with the diameter of 2-4mm according to the proportion of 1: 1-3: 0.5: 0.1-0.2, naturally drying the biological balls, putting the naturally dried biological balls into a drying oven with the temperature of 105 ℃ for drying for 1-2h, cooling the dried biological balls to room temperature, putting the biological balls into a muffle furnace for roasting at the temperature of 800-, and (3) cleaning the iron-carbon micro-electrolysis filler by using clean water to be neutral, drying the iron-carbon micro-electrolysis filler to finish a complete preparation cycle, taking the iron-carbon micro-electrolysis filler treated in the first cycle as a carrier in the second cycle, and repeating the operation processes in the third cycle by repeating the steps for 3-5 times to finally prepare the iron-carbon micro-electrolysis filler.
4. The constructed wetland biofilm coupled iron-carbon micro-electrolysis filler according to any one of claims 1 to 3, characterized in that: including the organic glass box, the left and right sides of organic glass box inner chamber bottom returns respectively to be equipped with baffle one and baffle two, organic glass box inner chamber and the position department that is located baffle one right side are equipped with gabion one, the intussuseption of gabion is filled with the gravel and packs, organic glass box inner chamber just is located two left positions departments of baffle and is equipped with gabion two, the intussuseption of gabion is filled with the zeolite filler, gabion one with from the top down is equipped with little electrolysis of iron carbon and packs and biomembrane filler in proper order between gabion two, the bottom that the biomembrane filled is connected with the counterweight, organic glass box inner chamber bottom just is located the position department of biomembrane filler below and is equipped with the aeration pipe.
5. The constructed wetland biofilm coupled iron-carbon micro-electrolysis filler according to claim 4, characterized in that: the position department that organic glass box left end face is close to the top is equipped with the water inlet, the position department that machine glass box right-hand member face is close to the bottom is equipped with the delivery port.
6. The constructed wetland biofilm coupled iron-carbon micro-electrolysis filler according to claim 4, characterized in that: the counterweight is a stainless steel pendant.
7. The constructed wetland biofilm coupled iron-carbon micro-electrolysis filler according to claim 4, characterized in that: and a first plant for ecological purification is planted on the upper part of the gravel filler in the first gabion.
8. The constructed wetland biofilm coupled iron-carbon micro-electrolysis filler according to claim 4, characterized in that: and a second ecological purification plant is planted in the zeolite filling part of the second gabion.
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