CN108585174B - Bionic oxygen-increasing micro-electrolysis artificial wetland - Google Patents

Bionic oxygen-increasing micro-electrolysis artificial wetland Download PDF

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CN108585174B
CN108585174B CN201810477509.3A CN201810477509A CN108585174B CN 108585174 B CN108585174 B CN 108585174B CN 201810477509 A CN201810477509 A CN 201810477509A CN 108585174 B CN108585174 B CN 108585174B
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wetland
anoxic
anaerobic
aerobic
artificial
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CN108585174A (en
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冯骞
台喜荣
孙亚青
钟天意
赵新宇
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Hohai University HHU
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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
    • C02F3/30—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
    • C02F3/30—Aerobic and anaerobic processes
    • C02F3/308—Biological phosphorus removal
    • 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
    • C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Microbiology (AREA)
  • Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Botany (AREA)
  • Biotechnology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The invention discloses a bionic oxygen-increasing micro-electrolysis artificial wetland, which is formed by sequentially connecting a plurality of groups of anoxic-anaerobic-aerobic artificial wetlands, wherein the plurality of groups of anoxic-anaerobic-aerobic artificial wetlands are arranged in a step shape; each group of the anoxic-anaerobic-aerobic artificial wetlands consists of an anoxic artificial wetland, an anaerobic artificial wetland and an aerobic artificial wetland which are connected in sequence, and the anoxic artificial wetland, the anaerobic artificial wetland and the aerobic artificial wetland in each group of the anoxic-anaerobic-aerobic artificial wetlands are also arranged in a step shape; the anoxic constructed wetland and the anaerobic constructed wetland in each group of the anoxic-anaerobic-aerobic constructed wetland are filled with filler layers with certain depth, the aerobic constructed wetland in each group of the anoxic-anaerobic-aerobic constructed wetland is internally provided with a siphon pipe, and the siphon pipe sucks water treated by the aerobic constructed wetland into a system water outlet or the anoxic constructed wetland in the next group of the anoxic-anaerobic-aerobic constructed wetland; wherein the filling amount of the filler layer in the anoxic artificial wetland accounts for 10-12% of the volume of the wetland, and the filling amount of the filler layer in the anaerobic artificial wetland accounts for 16-18% of the volume of the wetland. The constructed wetland can effectively improve the nitrogen and phosphorus removal efficiency of the wetland and reduce the occurrence of wetland blockage.

Description

Bionic oxygen-increasing micro-electrolysis artificial wetland
Technical Field
The invention relates to a bionic oxygen-increasing micro-electrolysis constructed wetland, and belongs to the technical field of water treatment.
Background
The application of the artificial wetland technology in the field of sewage treatment is more and more common, but people also more and more realize the limitations: (1) along with the increase of the operation time, the blocking phenomenon becomes more obvious, the dirt removing capability of the wetland is gradually limited, and the wetland is forced to be stopped for use; (2) compared with other treatment means, the constructed wetland is difficult to form a proper environment for removing pollutants, so that the reaction rate is slow, and the removal efficiency of COD, N and P is not high; (3) the lack of oxygen also greatly limits the wetland to exert its maximum effectiveness; (4) the effect of the wetland is limited due to the shortage of carbon sources for nitrogen and phosphorus removal; (5) phosphorus removal basically depends on phosphorus absorption of microorganisms, and other strengthening means are not provided.
In order to solve the problems in the wetland, a series of measures such as a method for enhancing reoxygenation are taken in engineering to improve the operation condition of the wetland, but various reasons still limit the wetland to play the role to the maximum. For example: the drop reoxygenation can improve the dissolved oxygen of the inlet water, but is influenced by saturated dissolved oxygen, the reoxygenation capacity is limited, and the drop device exposed outside can bring the problems of icing in winter, breeding of mosquitoes and flies in summer and the like. The artificial aeration needs to add a first-stage wetland to provide a denitrification environment and place, increase the capital cost and increase the energy consumption at the same time, so that the operation cost is increased, and therefore, in order to enable the wetland to operate efficiently, further improvement is needed.
Disclosure of Invention
The purpose of the invention is as follows: the technical problem to be solved by the invention is to provide a bionic oxygen-increasing micro-electrolysis artificial wetland, which can form an anoxic reaction environment, an anaerobic reaction environment and an aerobic reaction environment which are circularly alternated, so that the nitrification and denitrification are enhanced, and the denitrification efficiency of the whole artificial wetland is effectively improved; meanwhile, the alternative anaerobic and aerobic environments are also beneficial to improving the dephosphorization efficiency; secondly, the biodegradability of the sewage can be improved, a required carbon source is provided for subsequent biochemical reactions, the pollutant removal efficiency is further improved, and the operation period of the artificial wetland is further prolonged; thirdly, an aeration device is not required to be additionally arranged in the aerobic reaction environment, and the aerobic environment is always kept at high dissolved oxygen content through the synergistic interaction of the filler and the siphon; fourthly, the filler layer in the wetland has high pollutant removal efficiency, and the formed environment has low pH value, so that the reaction rate of the wetland can be accelerated.
In order to solve the technical problems, the technical means adopted by the invention is as follows:
a bionic oxygen-increasing micro-electrolysis artificial wetland is formed by sequentially connecting a plurality of groups of anoxic-anaerobic-aerobic artificial wetlands, wherein the plurality of groups of anoxic-anaerobic-aerobic artificial wetlands are arranged in a ladder shape; each group of the anoxic-anaerobic-aerobic artificial wetlands consists of an anoxic artificial wetland, an anaerobic artificial wetland and an aerobic artificial wetland which are connected in sequence, and the anoxic artificial wetland, the anaerobic artificial wetland and the aerobic artificial wetland in each group of the anoxic-anaerobic-aerobic artificial wetlands are also arranged in a step shape; the anoxic constructed wetland and the anaerobic constructed wetland in each group of the anoxic-anaerobic-aerobic constructed wetland are filled with filler layers with certain depth, the aerobic constructed wetland in each group of the anoxic-anaerobic-aerobic constructed wetland is internally provided with a siphon pipe, and the siphon pipe sucks water treated by the aerobic constructed wetland into a system water outlet or the anoxic constructed wetland in the next group of the anoxic-anaerobic-aerobic constructed wetland; wherein the filling amount of the filler layer in the anoxic artificial wetland accounts for 10-12% of the volume of the wetland, and the filling amount of the filler layer in the anaerobic artificial wetland accounts for 16-18% of the volume of the wetland.
Wherein, the anoxic artificial wetland and the anaerobic artificial wetland both adopt effluent weir to discharge water.
The filler layer is formed by mixing the following components in parts by weight: 10-12 parts of iron-carbon filler and 3-4 parts of manganese dioxide particles.
The filler layer is formed by mixing the following components in parts by weight: 20-30 parts of iron-carbon filler, 5-7 parts of manganese dioxide, 2-3 parts of ferric oxide, 1-2 parts of modified attapulgite, 2-3 parts of kaolin, 1-2 parts of expansive soil, 1-2 parts of plant fiber and 1-2 parts of activated sludge powder. The packing layers filled in the anoxic artificial wetland and the anaerobic artificial wetland in the wetland can enable the wetland to be in an anoxic and anaerobic environment through reaction, and meanwhile, the packing layers can also enable the pH value of the corresponding wetland to be lowered through reaction, so that the reaction rate of the wetland is accelerated.
Wherein, the bottom surface of each group of the anoxic-anaerobic-aerobic artificial wetland is paved with an anti-seepage water-proof layer.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
firstly, the multi-stage anoxic-anaerobic-aerobic artificial wetland is arranged in a ladder shape, the operation of the wetland is controlled by a hydraulic means, so that the water head of a water pump can be fully utilized in the whole process, potential energy is converted into kinetic energy through siphoning, secondly, a filler layer is arranged in the anoxic and anaerobic artificial wetland, macromolecular organic matters (i.e. pollutants difficult to degrade) can be degraded into micromolecular organic matters through the internal electrolytic reaction of the filler, and meanwhile, the micromolecular pollutants (i.e. side pollutants) can be degraded together with microorganisms in the artificial wetlandThe microbes are helped to quickly degrade easily degradable pollutants), so that the occurrence of the blocking phenomenon in the wetland is effectively reduced, and the operation period of the wetland is prolonged; thirdly, the internal electrolysis reaction of the filler can consume oxygen in an anoxic and anaerobic section, so that anoxic and anaerobic environments favorable for denitrification are formed, and the nitrogen and phosphorus removal efficiency of the system is improved; fourthly, the manganese dioxide particles in the filling layer can enable the filling material to have more efficient pollutant removal efficiency and reduce the pH value of the environment, thereby accelerating the reaction rate; more importantly, the manganese dioxide particles can also react with organic ligands in the system, thereby reducing the generation of H by the organic ligands to microorganisms2O2The inhibition of the action further improves the utilization efficiency of the filler in the system and the pollutant removal efficiency; fifthly, the reoxygenation effect brought by the siphonage effect of the aerobic section ensures that an aeration device is not additionally arranged in the aerobic artificial wetland, thereby not only realizing the purpose of low energy consumption, but also greatly consuming the residual organic matters, nitrogen, phosphorus and other pollutants in the system.
Drawings
FIG. 1 is a schematic structural diagram I of the bionic oxygen-increasing micro-electrolysis constructed wetland of the invention;
fig. 2 is a schematic structural diagram II of the bionic oxygen-increasing micro-electrolysis artificial wetland.
Detailed Description
The technical solution of the present invention is further explained with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-2, the bionic oxygen-increasing micro-electrolysis artificial wetland system is formed by sequentially connecting a plurality of groups of anoxic-anaerobic-aerobic artificial wetlands 1, wherein the plurality of groups of anoxic-anaerobic-aerobic artificial wetlands 1 are sequentially arranged in a step shape, and the arrangement mode can fully utilize a water pump head in the whole process, convert potential energy into kinetic energy through siphoning, promote the siphoning effect to be carried out, and form a circularly alternating aerobic-anaerobic environment through the arrangement of the plurality of groups, so that sewage is more fully treated; each group of the anoxic-anaerobic-aerobic artificial wetlands 1 is formed by sequentially connecting an anoxic artificial wetland 2, an anaerobic artificial wetland 6 and an aerobic artificial wetland 9, and the anoxic artificial wetland 2, the anaerobic artificial wetland 6 and the aerobic artificial wetland 9 in each group of the anoxic-anaerobic-aerobic artificial wetlands 1 are also arranged in a step shape; the anoxic artificial wetland 2 and the anaerobic artificial wetland 6 in each group of the anoxic-anaerobic-aerobic artificial wetland 1 are filled with filler layers with certain depths, the filler amount of the filler layer 3 in the anoxic artificial wetland 2 accounts for 10-12% of the volume of the anoxic artificial wetland 2 (realizing the anoxic environment of the wetland), and the filler amount of the filler layer 5 in the anaerobic artificial wetland 6 accounts for 16-18% of the volume of the anaerobic artificial wetland 6 (realizing the anaerobic environment of the wetland); the packing layer 3 and the packing layer 5 can be mixed packing of 10-12 parts of iron-carbon packing and 3-4 parts of manganese dioxide particles; or 20-30 parts of iron carbon filler, 5-7 parts of manganese dioxide, 2-3 parts of ferric oxide, 1-2 parts of modified attapulgite, 2-3 parts of kaolin, 1-2 parts of bentonite, 1-2 parts of plant fiber and 1-2 parts of mixed filler of activated sludge powder; the packing layer 3 can also be a mixed packing of 10-12 parts of iron carbon packing and 3-4 parts of manganese dioxide particles, and the packing layer 5 is a mixed packing of 20-30 parts of iron carbon packing, 5-7 parts of manganese dioxide, 2-3 parts of ferric oxide, 1-2 parts of modified attapulgite, 2-3 parts of kaolin, 1-2 parts of bentonite, 1-2 parts of plant fiber and 1-2 parts of activated sludge powder; or the packing layer 3 is a mixed packing of 20-30 parts of iron carbon packing, 5-7 parts of manganese dioxide, 2-3 parts of ferric oxide, 1-2 parts of modified attapulgite, 2-3 parts of kaolin, 1-2 parts of bentonite, 1-2 parts of plant fiber and 1-2 parts of activated sludge powder, and the packing layer 5 is a mixed packing of 10-12 parts of iron carbon packing and 3-4 parts of manganese dioxide particles. Siphon pipes 10 are arranged in the aerobic artificial wetlands 9 in each group of the anoxic-anaerobic-aerobic artificial wetlands 1, and the siphon pipes 10 suck water treated by the aerobic artificial wetlands 9 into a system water outlet 11 or the anoxic artificial wetlands 2 of the next group of the anoxic-anaerobic-aerobic artificial wetlands 1; the siphon 9 is formed by the water force action in the system and breaks the siphon phenomenon to automatically complete the oxygenation function of the aerobic artificial wetland 9. The anoxic artificial wetland 2 and the anaerobic artificial wetland 6 in each group of the anoxic-anaerobic-aerobic artificial wetland 1 adopt effluent weir to discharge water; the bottom surface of each anoxic-anaerobic-aerobic artificial wetland 1 is paved with an anti-seepage water-proof layer 12.
The water to be purified enters the anoxic artificial wetland 2 from the water inlet part of the anoxic artificial wetland 2 for treatment, the effluent of the anoxic artificial wetland 2 flows out through the effluent weir 4, the effluent flows into the anaerobic artificial wetland 6 from the water inlet part of the anaerobic artificial wetland 6, the water treated by the anaerobic artificial wetland 6 flows into the aerobic artificial wetland 9 through the overflow weir 7, and the water treated in the aerobic artificial wetland 9 is discharged into the water outlet 11 of the wetland system or the anoxic artificial wetland 2 of the next group of anoxic-anaerobic-aerobic artificial wetland 1 through the siphon 10. A siphon pipe 10 is arranged at the water outlet end of an aerobic artificial wetland 9 of the anoxic-anaerobic-aerobic artificial wetland 1, sewage enters the aerobic artificial wetland 9 and does not reach the top of a siphon pipe 10, the siphon pipe 10 plays a role of sealing water outlet, at the moment, the water level in the aerobic artificial wetland 9 rises until the water level reaches the top of the siphon pipe 10, the water in the siphon pipe 10 flows into the anoxic artificial wetland 2 or a system water outlet 11 of the next group of anoxic-anaerobic-aerobic artificial wetland 1 along an outlet to form a siphon effect, at the moment, under the siphon effect, the water in the aerobic artificial wetland 9 is rapidly drained away, partial negative pressure is formed inside the aerobic artificial wetland 9, a suction effect is formed on the atmosphere, and the purpose of strengthening reoxygenation of the aerobic artificial wetland 9 is achieved; therefore, an aeration device is not required to be additionally arranged in the aerobic reaction environment. The siphon action can quickly discharge the water of the aerobic artificial wetland 10 to the water outlet 11 of the system or the anoxic artificial wetland 2 of the next group of anoxic-anaerobic-aerobic artificial wetland 1, and part of pollutants are intercepted in the aerobic artificial wetland 9 for subsequent reaction. When the water level of the aerobic artificial wetland 9 is reduced to be below the orifice of the siphon 10, the hydraulic breaking is formed, the siphon action is destroyed, and as water continuously enters the aerobic artificial wetland 9, water is continuously accumulated in the aerobic artificial wetland 9 to prepare for the next siphon action.
The bionic oxygen-increasing micro-electrolysis artificial wetland is constructed in a grading way, and the oxygen-poor artificial wetland 2 and the anaerobic artificial wetland 6 are internally provided with filler layers; the iron-carbon filler in the filler layer can generate internal electrolysis reaction in the wetland, on one hand, macromolecular pollutants can be degraded into micromolecular organic matters through the internal electrolysis reaction of the filler, and meanwhile, microorganisms can be helped to rapidly degrade easily-degradable micromolecular pollutants, so that the occurrence of blocking phenomenon in the wetland is effectively reduced, the operation period of the wetland is prolonged, on the other hand, the internal electrolysis reaction of the filler can consume oxygen in anoxic and anaerobic sections, the anoxic artificial wetland 2 is positioned in an anoxic environment, the anaerobic artificial wetland 6 is positioned in an anaerobic reaction environment, the anoxic and anaerobic environments which are beneficial to denitrification are formed, and the denitrification efficiency of the system is improved; the other components mixed in the filler layer can promote the internal electrolysis reaction of the filler layer in cooperation with the iron-carbon filler, so that the whole filler layer has higher pollutant removal efficiency, the pH value of the environment can be effectively reduced, the reaction rate of the internal electrolysis is accelerated, and a carbon source is provided for the following denitrification process; the subsequent aerobic artificial wetland 9 is oxygenated under the siphon action to form an aerobic environment. The artificial wetland can effectively promote the effects of nitrogen removal and phosphorus removal of the wetland through the synergistic action of aerobic and anaerobic effects.
The artificial wetland enhances the removal efficiency of pollutants by the wetland through the additional filler, reduces the blockage phenomenon and provides a carbon source for the following denitrification process; in addition, by forming isolated and alternate anoxic, anaerobic and aerobic areas, the nitrification and denitrification processes are more thorough, so that the denitrification efficiency of the whole artificial wetland is improved, and meanwhile, pollutants can be further degraded, so that the blocking phenomenon in the wetland is further reduced, and a system wetland system which is long in running period and stable is formed. Compared with the traditional constructed wetland, the denitrification efficiency of the constructed wetland is improved by more than 80 percent, the dephosphorization efficiency is improved by more than 75 percent, and the water purified by the constructed wetland can be directly reused as farmland irrigation water.
Two equal parts of eutrophic water which flows away along with rainwater in a paddy field have COD of 2400mg/L and ammonia nitrogen concentration of 700mg/L before treatment, and after one part of eutrophic water is treated by the existing artificial wetland, the COD of the yielding water is less than or equal to 800mg/L and the ammonia nitrogen concentration is less than or equal to 100 mg/L; after the other part is treated by the artificial wetland system, the COD of the effluent is less than or equal to 100mg/L, and the ammonia nitrogen concentration is less than or equal to 10 mg/L.

Claims (3)

1. A bionic oxygen-increasing micro-electrolysis artificial wetland is characterized in that: the artificial wetland system is formed by sequentially connecting a plurality of groups of anoxic-anaerobic-aerobic artificial wetlands, wherein the plurality of groups of anoxic-anaerobic-aerobic artificial wetlands are arranged in a ladder shape; each group of the anoxic-anaerobic-aerobic artificial wetlands consists of an anoxic artificial wetland, an anaerobic artificial wetland and an aerobic artificial wetland which are connected in sequence, and the anoxic artificial wetland, the anaerobic artificial wetland and the aerobic artificial wetland in each group of the anoxic-anaerobic-aerobic artificial wetlands are also arranged in a step shape; the anoxic constructed wetland and the anaerobic constructed wetland in each group of the anoxic-anaerobic-aerobic constructed wetland are filled with filler layers with certain depth, the aerobic constructed wetland in each group of the anoxic-anaerobic-aerobic constructed wetland is internally provided with a siphon pipe, and the siphon pipe sucks water treated by the aerobic constructed wetland into a system water outlet or the anoxic constructed wetland in the next group of the anoxic-anaerobic-aerobic constructed wetland; the filling amount of the filler layer in the anoxic artificial wetland accounts for 10-12% of the volume of the wetland, and the filling amount of the filler layer in the anaerobic artificial wetland accounts for 16-18% of the volume of the wetland; the filler layer is formed by mixing the following components in parts by weight: 20-30 parts of iron-carbon filler, 5-7 parts of manganese dioxide, 2-3 parts of ferric oxide, 1-2 parts of modified attapulgite, 2-3 parts of kaolin, 1-2 parts of expansive soil, 1-2 parts of plant fiber and 1-2 parts of activated sludge powder.
2. The bionic oxygen-increasing micro-electrolysis artificial wetland according to claim 1, which is characterized in that: and the anoxic artificial wetland and the anaerobic artificial wetland both adopt effluent weir to discharge water.
3. The bionic oxygen-increasing micro-electrolysis artificial wetland according to claim 1, which is characterized in that: the bottom surface of each anoxic-anaerobic-aerobic artificial wetland is paved with an anti-seepage water-proof layer.
CN201810477509.3A 2018-05-17 2018-05-17 Bionic oxygen-increasing micro-electrolysis artificial wetland Active CN108585174B (en)

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CN109734261A (en) * 2019-03-18 2019-05-10 大连交通大学 Domestic sewage denitrifying-dephosphorizing purification tank
CN111635008A (en) * 2020-06-18 2020-09-08 湖南惟创环境科技有限公司 Ecological repair system of step degree of depth that pollutes farmland tail water treatment
CN112279377A (en) * 2020-09-30 2021-01-29 国河环境研究院(南京)有限公司 Preparation method of wetland filler for purifying black and odorous water body and water purifying device using filler

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CN102079579B (en) * 2009-11-26 2013-02-06 宝山钢铁股份有限公司 Artificial wetland with combined fillers and treating process thereof
CN201952332U (en) * 2011-01-28 2011-08-31 李迎军 Self-oxygenated subsurface-flow constructed-wetland sewage-purifying device
CN103936226B (en) * 2014-04-04 2015-09-09 环境保护部南京环境科学研究所 A kind of artificial wet land system and operation method thereof

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