CN220845744U - Artificial wetland system for reinforced iron-based carbon release denitrification and greenhouse emission reduction - Google Patents
Artificial wetland system for reinforced iron-based carbon release denitrification and greenhouse emission reduction Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 127
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 59
- 230000009467 reduction Effects 0.000 title claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 182
- 238000000746 purification Methods 0.000 claims abstract description 33
- 239000011159 matrix material Substances 0.000 claims description 25
- 238000005273 aeration Methods 0.000 claims description 24
- 239000000758 substrate Substances 0.000 claims description 24
- 241000196324 Embryophyta Species 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 9
- 239000000945 filler Substances 0.000 claims description 5
- 235000005273 Canna coccinea Nutrition 0.000 claims description 2
- 240000008555 Canna flaccida Species 0.000 claims description 2
- 241000628997 Flos Species 0.000 claims description 2
- 238000005728 strengthening Methods 0.000 claims description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 50
- 239000010865 sewage Substances 0.000 abstract description 38
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 26
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 239000005431 greenhouse gas Substances 0.000 abstract description 7
- 238000005868 electrolysis reaction Methods 0.000 abstract description 3
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910002651 NO3 Inorganic materials 0.000 description 11
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 11
- 229910052760 oxygen Inorganic materials 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 9
- 239000001301 oxygen Substances 0.000 description 9
- 238000000034 method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000001651 autotrophic effect Effects 0.000 description 5
- 239000002131 composite material Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- NIFIFKQPDTWWGU-UHFFFAOYSA-N pyrite Chemical compound [Fe+2].[S-][S-] NIFIFKQPDTWWGU-UHFFFAOYSA-N 0.000 description 3
- 229910052683 pyrite Inorganic materials 0.000 description 3
- 239000011028 pyrite Substances 0.000 description 3
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 244000205574 Acorus calamus Species 0.000 description 1
- 235000011996 Calamus deerratus Nutrition 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008236 biological pathway Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000000149 chemical water pollutant Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- WKPSFPXMYGFAQW-UHFFFAOYSA-N iron;hydrate Chemical compound O.[Fe] WKPSFPXMYGFAQW-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000008635 plant growth Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000010457 zeolite Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
An artificial wetland system for enhanced iron-based carbon release denitrification and greenhouse emission reduction, comprising: the water inlet module, the water purifying module and the water outlet module are connected in sequence; the outlet of the water outlet module is connected with a drain pipe or a return pipe, and the other end of the return pipe is connected to the water inlet module; the return pipe is arranged between the water inlet module and the water outlet module; the water purification module comprises a plurality of wetlands, and valves for water inflow are arranged between each wetland and the water inlet channel and between each wetland; the other end of one wetland is provided with a valve for water outflow; and adjusting each wetland to be in parallel connection or series connection by controlling the opening and closing of the valve. Aiming at the water bodies with different pollution degrees, the utility model flexibly adjusts the constructed wetland system according to different water quality purification requirements, takes the iron base and the biochar as combined matrixes to form the iron-carbon micro-electrolysis system, promotes nitrogen conversion to improve denitrification efficiency, and simultaneously cooperatively reduces greenhouse gas emission by 20% -40%, so that the device synchronously realizes sewage treatment and greenhouse emission reduction.
Description
Technical Field
The utility model belongs to the fields of sewage denitrification treatment, water purification and artificial wetland, and relates to an artificial wetland system for reinforced iron-based carbon release denitrification and greenhouse emission reduction.
Background
In recent years, the water quality of rivers, lakes and the like is affected by the rapid development of industry, the amount of discharged wastewater is greatly increased, and the eutrophication is serious due to the accumulation of nitrogen and phosphorus. At the same time, the problem of global warming is also becoming more serious with the development of industry, and effective control and reduction of greenhouse gas emissions is of great importance in alleviating global warming.
As an environment-friendly ecological technology, the constructed wetland has the advantages of low investment cost, good treatment effect, low maintenance cost and the like, and is often used for treating domestic sewage, mine wastewater, landfill leachate and the like. The matrix is used as a main carrier of the artificial wetland, plays an important role in the artificial wetland, such as facilitating the adhesion of biological membranes, fixing the growth of plants, being used as an adsorbent of pollutants and the like. Different types of substrates have different mechanisms for removing pollutants, and the removal efficiency of the pollutants is different due to the unique physicochemical properties of the substrates.
The China patent authority publication document No. CN202110903100.5 discloses an artificial wetland system capable of enhancing denitrification: the method adopts the self wetland plants to prepare the biochar as the wetland matrix, strengthens denitrification, improves the removal of nitrate nitrogen, realizes the reutilization of the wetland plants, and achieves the aim of reducing the occupied area. But the patent is silent about iron-based materials and reduction of carbon emissions.
The Chinese patent grant publication document No. CN201920949145.4, a biochar base sequence artificial wetland sewage treatment system, discloses: the saturated-dry falling alternating operation mode is adopted to create aerobic-anoxic environment conditions, and the purposes of efficiently removing dirt and relieving wetland blockage are achieved under the conditions of small occupied area and no increase in cost. But the patent is silent about iron-based materials and reduction of carbon emissions.
Studies have shown that different types of matrix composites are stronger than the denitrification capacity of a single matrix. However, at present, a single matrix is generally adopted in the constructed wetland, so that the matrixes with different characteristics are limited to exert different physicochemical properties to adsorb or convert nitrogen, the improvement of denitrification efficiency is hindered, and the operation mode of a wetland system is single and cannot be adjusted according to different water quality conditions.
Disclosure of utility model
In order to overcome the defects of the prior art, the utility model provides the constructed wetland system for strengthening the iron-based carbon release denitrification and greenhouse emission reduction, aiming at water bodies with different pollution degrees, the constructed wetland system is flexibly regulated according to different water quality purification requirements, the iron-based and the biochar are used as a combined matrix, the nitrogen conversion is promoted, the denitrification efficiency is improved, and meanwhile, the greenhouse gas emission is cooperatively reduced, so that the device synchronously realizes sewage treatment and greenhouse emission reduction.
The constructed wetland system adopts iron-based and biochar as a constructed wetland matrix:
(1) Compared with the common denitrification reaction (①), the iron autotrophic denitrification reaction (②、③) generated in the system greatly reduces the emission flux of greenhouse gas CO 2 and can reduce the emission of 70-85% of CO 2.
Common denitrification ：5CH3COOH+8NO3 -→6H2O+10CO2+4N2+8OH-+ATP ①
Autotrophic denitrification of iron: 4Fe (0) +NO 3 -+7H2O→4Fe3++NH4 ++10OH-② (zero valent iron)
5Fe 2++NO3 -+7H2O→5FeOOH+1/2N2+9H+③ (ferrous iron)
(2) Conversion of 1 mole unit of Fe 0 to Fe 3+ provides 3 mole units of electron donor, while conversion of 1 mole unit of NO 3 - to N 2 requires 5 mole units of electron donor.
Conversion of 1 mole unit of Fe 2+ to Fe 3+ provides 1 mole unit of electron donor, while conversion of 1 mole unit of NO 3 - to N 2 requires 5 mole units of electron donor.
The mass calculation formula of the iron-based matrix in the constructed wetland system is as follows:
MFe Total (S) ＝MFe1+MFe2
MFe1＝xCNO3 --N*VNO3 --N/14*5/3*56/α＝6.67x CNO3 --N*VNO3 --N/α
MFe2＝yCNO3 --N*VNO3 --N/14*5*56/β＝20y CNO3 --N*VNO3 --N/β
x+y＝1
M Fe Total (S) , the total mass of iron base required by the constructed wetland system, and unit (kg);
M Fe1, the mass of the simple substance iron required by the constructed wetland system, and the unit (kg);
m Fe2, the mass of ferrous iron required by the constructed wetland system, and the unit (kg);
-the constructed wetland system requires reduced nitrate nitrogen concentration in units of (kg/L);
-the amount of water (L) that the constructed wetland system needs to treat;
alpha, the supply rate of electron donors can be provided in the elemental iron, and the supply rate is preferably 0.5 to 0.7;
Beta-ferrous iron can provide electron donor with a supply rate of 0.6-0.8;
x is the ratio of the nitrate to the nitrogen needed to be treated by the elemental iron, and can be 0 to 1;
y, the ratio of the nitrate to the nitrogen required by ferrous iron treatment is 0-1;
(3) When the concentration of Fe 2+ exceeds the electron required by N 2 O, N 2 O can accept the redundant electron and further reduce to N 2,4.2g Fe2+, so that the emission of greenhouse gases (④) of 1g N 2 O can be reduced, and the emission of N 2 O can be reduced by 30-45%.
2Fe2++2H++N2O→2Fe3++N2+H2O ④
(4) The addition of iron also changes the microbial community structure in the wetland, influences the removal of nitrogen and the emission of N 2 O on a microscopic level, and can improve the nitrogen removal efficiency through biological pathways such as autotrophic denitrification, anaerobic ammoxidation and the like.
(5) The wetland system is added with biochar to release carbon sources on one hand, provide electron donors and relieve the problem of low carbon in sewage treatment; on the other hand, the iron and carbon micro-electrolysis system is formed with iron, and a plurality of micro-current electric fields formed between the iron and the carbon have primary cell effect, so that the effects of adsorption, reduction, microbial degradation and the like are enhanced.
(6) The total nitrogen concentration of the water is 0-50mg/L, and the volume ratio of the iron base to the biochar is 2:1; the total nitrogen concentration of the water is 51-100mg/L, and the volume ratio of the iron base to the biochar is 1:1.
The utility model aims at realizing the following technical scheme:
an artificial wetland system for enhanced iron-based carbon release denitrification and greenhouse emission reduction, comprising:
The water inlet module, the water purifying module and the water outlet module are connected in sequence; the outlet of the water outlet module is connected with a drain pipe or a return pipe, and the other end of the return pipe is connected to the water inlet module;
The return pipe is arranged between the water inlet module and the water outlet module;
The water purification module comprises a plurality of wetlands, and valves for water inflow are arranged between each wetland and the water inlet channel and between each wetland; the other end of at least one wetland is provided with a valve for water outflow; and adjusting each wetland to be in parallel connection or series connection by controlling the opening and closing of the valve.
The reinforced iron-based carbon-release denitrification and greenhouse emission reduction constructed wetland system is characterized in that the water inlet module is a water inlet channel, and the water outlet module is a water outlet channel.
The reinforced iron-based carbon-release denitrification and greenhouse emission reduction constructed wetland system comprises a water purification module and a water purification module.
The reinforced iron-based carbon-release denitrification and greenhouse emission reduction constructed wetland system is characterized in that the bottom of the water inlet channel and the bottom of the water outlet channel are respectively provided with a water quality detector.
According to the reinforced iron-based carbon-release denitrification and greenhouse emission reduction constructed wetland system, the first wetland is a common aeration wetland, a water purification substrate layer is paved in the second wetland, the second wetland comprises a lower substrate layer and an upper substrate layer, aquatic plants are planted in the upper substrate layer, the aquatic plants are one or more of rhizoma acori graminei, flos lonicerae, iris and canna, and the planting density is 20-40 plants/m 2.
In the reinforced iron-based carbon release denitrification and greenhouse emission reduction constructed wetland system, the filler of the upper matrix layer is common gravel, and the particle size range is 10-20mm; the filler of the lower matrix layer is iron-based biochar, and is an iron-based and biochar composite matrix, wherein the particle size range of the iron-based biochar is 5-10mm, the particle size range of the biochar is 5-10mm, and the specific surface area of the biochar is 10-1000m 2/g.
In the reinforced iron-based carbon-release denitrification and greenhouse emission reduction constructed wetland system, the height of the lower substrate layer is h 1 (10-20 cm), and the height of the upper substrate layer is h 2 (20-30 cm).
The application method of the reinforced iron-based carbon-release denitrification and greenhouse emission reduction constructed wetland system comprises the following steps:
the first step: sewage to be treated enters the water inlet channel through the water inlet;
And a second step of: the water quality of the inlet water is measured through a first water quality detector at the bottom of the water inlet channel, and the first water quality detector judges the transmitted data C 1:
a. If C 1>C Feeding in , opening a valve between the first wetland and the water inlet channel and a valve between the first wetland and the second wetland, wherein the first wetland and the second wetland are in series connection, and sewage sequentially passes through the first wetland and the second wetland;
b. If C 1≤C Feeding in , only opening a valve between the second wetland and the water inlet channel, and allowing sewage to pass through the second wetland;
And a third step of: the sewage flows into the first wetland through the water inlet channel, ammonia nitrogen removal is enhanced through the aeration system, and the content of dissolved oxygen is monitored;
fourth step: the sewage enters the second wetland through a valve between the first wetland and the second wetland, and is subjected to iron-based reinforced denitrification and greenhouse emission reduction;
fifth step: discharging the treated effluent to a water outlet channel;
Sixth step: the water quality of the effluent is measured by a second water quality detector at the bottom of the water outlet channel, and the second water quality detector judges the transmitted data C 2:
a. If C 2>C Out of , opening a valve between the water outlet channel and the return pipe, and returning the water to the water inlet channel through the return pipe for purifying again;
b. If C 2≤C Out of , discharging the water body from the water outlet channel;
c. If the NO 3 -N data is abnormal, the water purification substrate layer of the second wetland needs to be supplemented or replaced.
Optionally, the lower substrate layer of the water purification substrate of the second wetland adjusts the volume ratio according to the concentration of the pollutant in the treated water: the total nitrogen concentration of the water is 0-50mg/L, and the volume ratio of the iron base to the biochar is 2:1; the total nitrogen concentration of the water is 51-100mg/L, and the volume ratio of the iron base to the biochar is 1:1.
The constructed wetland system for reinforced iron-based carbon release denitrification and greenhouse emission reduction has the structure type of a vertical downward flow constructed wetland, the water inlet mode is intermittent water inlet, the hydraulic retention time is optionally 66-70h, the evacuation time is 2-6h, and an aeration device is arranged in the first wetland.
The method comprises the steps that the content of dissolved oxygen in a first wetland is collected by a sensor and monitored in real time by a monitoring system, the monitoring system judges the current concentration DO n, n=0, 1,2 and … … of the dissolved oxygen, and when the content is lower than a lower limit value, namely DO n<DOL, an aeration device is started for aeration; when the content is higher than the upper limit value, DO n>DOU, closing the aeration equipment; when the content is within the upper and lower limit values, i.e., DO L≤DOn≤DOU, the aeration intensity is not changed, and then the operation is continued with n=n+1.
Optionally, the dissolved oxygen concentration lower limit DO L is 2mg/L; the upper limit DO U of the dissolved oxygen concentration is 6mg/L; when the content is within the upper limit value and the lower limit value, the aeration intensity is 1.0-2.0L/min.
By adopting the technical scheme, the beneficial effects obtained by the utility model include:
(1) According to the wetland disclosed by the utility model, the first wetland is a common aeration wetland, the second wetland adopts a double-layer purification base layer, a common gravel layer and a combined matrix layer formed by a mixture of iron base and biochar, and by means of the characteristics of different matrixes, the iron base provides autotrophic denitrification of an inorganic electron donor enhancement system, meanwhile, the biochar is used as a denitrification microorganism slow-release carbon denitrification source, and the two are mixed to form an iron-carbon micro-electrolysis system, so that synchronous nitrification and denitrification are further promoted, autotrophic and heterotrophic denitrification of microorganisms are enhanced, nitrogen conversion is promoted, the denitrification efficiency is improved, and meanwhile, the emission of greenhouse gases is reduced. After the constructed wetland denitrification device provided by the utility model is operated, the denitrification efficiency can reach 90% -98%, and the greenhouse gas emission is reduced by 20% -40%.
(2) According to the constructed wetland system, two groups of wetland devices are selectively operated according to the water quality purification requirement, so that the constructed wetland system is flexibly regulated, the purification efficiency is improved, and the resource waste is avoided.
Drawings
In order to more clearly illustrate the technical solution in the embodiments of the present utility model, the following drawings are provided for cooperation:
FIG. 1 is a plan view of an constructed wetland system according to the utility model;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a schematic layer structure of the second wetland according to the present utility model;
FIG. 5 is a schematic diagram of the operation of the constructed wetland system according to the present utility model;
FIG. 6 is a schematic diagram of connection relationships between functional modules according to the present utility model;
fig. 7 is a schematic diagram of the operation of the aeration system of the present utility model.
Description of the reference numerals: 1-1, a water inlet channel; 2-1 parts of a first wetland, 2-2 parts of a second wetland, 2-3 parts of a lower substrate layer, 2-4 parts of an upper substrate layer and 2-5 parts of aquatic plants; 3-1, a water outlet channel; 4. a return pipe; 5-1, 5-2, 5-3, 5-4, 5-5, 5-6 and 5-6; 6. a sensor; 7-1, a first water quality detector, 7-2, a second water quality detector; 8. an aeration device; 9. a monitoring system;
10. The water inlet module, 20. The water purification module, 30. The water outlet module.
It should be noted that the above-mentioned figures illustrate only some embodiments of the utility model and that those skilled in the art will be able to obtain figures of other embodiments from these figures without inventive faculty.
Detailed Description
In order to make the objects, technical solutions and advantageous effects of the present utility model more apparent, the present utility model will be further described in detail with reference to the accompanying drawings and examples. It should be understood that: the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Spatially relative terms, such as "under," "below," "lower," "over," "upper" and the like, may be used for convenience of description to describe one element or feature as illustrated in the figures relative to another element or feature as desired. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "under" or "beneath" other elements or features would then be oriented "over" the other elements or features.
Unless otherwise defined, terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present utility model pertains, and should be understood to have a meaning consistent with the meaning of the related art, except insofar as the present utility model is explicitly defined.
In the utility model, the first wetland is a common aeration wetland, no special requirement is imposed on the filling material of the matrix layer, and the conventional common gravel, zeolite, coal, river sand, pebbles and the like can be used. The filler is preferably washed before use, the utility model has no special requirement on the washing mode, and impurities can be removed according to the process well known in the field.
In the utility model, the material of the lower substrate layer paved on the second wetland is common gravel, and the grain size is preferably 10-20mm. The utility model has no special requirement on the source of the gravel, and the common gravel in the market can be used. The gravel is preferably and washed prior to use, and the utility model does not require special requirements for the washing mode, and impurities can be removed according to procedures well known in the art.
In the utility model, the material of the lower matrix layer paved on the second wetland is a composite matrix layer formed by mixing iron-based and biochar according to the volume ratio. The particle size of the biochar is preferably 5-10mm. The particle size of the iron-based is preferably 5 to 10mm. The utility model has no special requirement on the biochar source, and can use the commercial biochar or prepare by oneself. The charcoal is preferably particle size and cleaned before use, the utility model has no special requirement on the cleaning mode, and impurities can be removed according to the process well known in the art. The utility model can use common iron-based (zero-valent iron, iron (hydrogen) oxide and iron sulfide) sources in the market. The iron-based is preferably and cleaned before use, and the utility model has no special requirements on the cleaning mode, and impurities can be removed according to the process well known in the art.
Example 1
An artificial wetland system for enhanced iron-based carbon release denitrification and greenhouse emission reduction, comprising: the water inlet module 10, the water purifying module 20 and the water outlet module 30 are connected in sequence; wherein the outlet of the water outlet module 30 is connected with a drain pipe or a return pipe 4, and the other end of the return pipe 4 is connected with the water inlet module 10;
Wherein, the water inlet module 10 adopts a water inlet channel 1-1, the water outlet module 30 adopts a water outlet channel 3-1, and the return pipe 4 is arranged between the water outlet channel 3-1 and the water inlet channel 1-1; the bottom of the water inlet channel 1-1 and the bottom of the water outlet channel 3-1 are respectively provided with a first water quality detector 7-1 and a second water quality detector 7-2 for measuring the water quality of the inlet water and the outlet water.
The water purification module 20 includes a first wetland 2-1 and a second wetland 2-2, wherein the first and second wetlands 2-1 and 2-2 are constructed as vertical downflow artificial wetlands, and an aeration device (not shown in the figure for simplicity) is installed inside the first wetland 2-1.
A first valve 5-1 for water inflow is arranged between the first wetland 2-1 and the water inlet channel 1-1; a second valve 5-2 for water inflow is arranged between the second wetland 2-2 and the water inlet channel 1-1; a third valve 5-3 is arranged between the first wetland 2-1 and the second wetland 2-2; the other end of the second wetland 2-2 is provided with a fourth valve 5-4 for water outflow; the first wetland 2-1 and the second wetland 2-2 are adjusted to be in parallel connection or in series connection by controlling the opening and closing of the valves; the two ends of the return pipe 4 are respectively connected with the two ends of the water outlet channel 3-1 through a fifth valve 5-5 and a sixth valve 5-6.
And a water purification matrix layer is paved in the second wetland 2-2 of the water purification module 20, wherein the material of the lower matrix layer 2-3 is common gravel, the grain size range is 10-20mm, and the paving height is 15cm. The upper matrix layer 2-4 is a composite matrix layer formed by mixing pyrite and biochar according to the volume ratio of 2:1, the grain diameter range is 5-10mm, and the laying height is 25cm. In the present utility model, sewage flows through pyrite-biochar layer of the upper substrate layer 2-4 and gravel layer of the lower substrate layer 2-3 in order, and nitrogen is adsorbed on the surface of the substrate or is converted in form by electron donor provided by pyrite and biochar.
2-5 Of aquatic plants are planted on the upper matrix layer of the constructed wetland, wherein the aquatic plants 2-5 are preferably yellow calamus, and the planting density is 30 plants/m 2. The water inlet mode of the constructed wetland is preferably intermittent water inlet; the hydraulic retention time of the intermittent water inlet mode is preferably 68 hours, and the emptying time is preferably 4 hours. The dissolved oxygen content in the first wetland 2-1 is collected by the sensor 6 and monitored by the monitoring system 9 in real time, the monitoring system 9 judges the current dissolved oxygen concentration DO n (n=0, 1,2 … …), when the content is lower than the lower limit value (DO n<DOL =2 mg/L), the aeration equipment 8 is started to perform aeration, when the content is higher than the upper limit value (DO n>DOU =6 mg/L), the aeration equipment 8 is closed, when the content is within the upper limit value and the lower limit value (DO L≤DOn≤DOU), the aeration intensity is unchanged, the aeration intensity is 1.0-2.0L/min, and then the operation is continued with n=n+1.
The operation mode of the constructed wetland system is as follows:
The first step: sewage to be treated enters the water inlet channel 1-1 through the water inlet;
And a second step of: the sewage is subjected to water quality measurement by a first water quality detector 7-1 at the bottom of the water inlet channel 1-1, and the first water quality detector 7-1 judges transmitted data C 1:
wherein, C 1 is the ammonia nitrogen concentration before sewage purification; c 1 =28 mg/L;
C Feeding in is ammonia nitrogen concentration of the incoming wetland, C Feeding in =20mg/L;
C 1>C Feeding in , opening valves 5-1, 5-3 and 5-4, and enabling sewage to sequentially pass through the first wetland 2-1 and the second wetland 2-2;
And a third step of: the sewage flows into the first wetland 2-1 through the water inlet channel 1-1, ammonia nitrogen removal is enhanced through an aeration system, the dissolved oxygen content=3 mg/L, the aeration system is started, and the aeration intensity is 2.0L/min;
Fourth step: the sewage enters the second wetland 2-2 through a valve 5-3 between the first wetland 2-1 and the second wetland 2-2, and nitrogen removal and greenhouse emission reduction are enhanced through iron-based technology;
fifth step: the treated effluent is discharged to a water outlet channel 3-1;
Sixth step: the water quality of the effluent is measured by a second water quality detector 7-2 at the bottom of the water outlet channel 3-1, and the second water quality detector 7-2 judges the transmitted data C 2: c 2＜C Out of , discharging the water body from the water outlet channel 3-1.
Wherein, C 2 is the total nitrogen concentration after sewage purification; c 2 =3.6 mg/L;
C Out of is the total nitrogen concentration of the wetland, C Out of =5 mg/L.
Example 2
The constructed wetland system described in example 1 operates as follows:
The first step: sewage to be treated enters the water inlet channel 1-1 through the water inlet;
And a second step of: the sewage is subjected to water quality measurement by a first water quality detector 7-1 at the bottom of the water inlet channel 1-1, and the first water quality detector 7-1 judges transmitted data C 1:
Wherein, C 1 is the ammonia nitrogen concentration before sewage purification; c 1 =15 mg/L;
C Feeding in is ammonia nitrogen concentration of the incoming wetland, C Feeding in =20mg/L;
C 1＜C Feeding in , opening the valves 5-2 and 5-4, and allowing sewage to pass through the second wetland 2-2;
and a third step of: the sewage is treated by the second wetland 2-2 and then discharged to the water outlet channel 3-1;
Fourth step: the water quality of the effluent is measured by a second water quality detector 7-2 at the bottom of the water outlet channel 3-1, and the second water quality detector 7-2 judges the transmitted data C 2: c 2＜C Out of , discharging the water body from the water outlet channel 3-1.
Wherein, C 2 is the total nitrogen concentration after sewage purification; c 2 =2.8 mg/L;
C Out of is the total nitrogen concentration of the wetland, C Out of =5 mg/L.
Example 3
The difference from example 1 is that:
And a water purification matrix layer is paved in the second wetland 2-2 of the water purification module, wherein the upper matrix layer 2-4 is a composite matrix layer formed by mixing pyrite and biochar according to the volume ratio of 1:1, the grain size range is 5-10mm, and the paving height is 25cm.
The operation mode of the constructed wetland system is as follows:
The first step: sewage to be treated enters the water inlet channel 1-1 through the water inlet;
And a second step of: the sewage is subjected to water quality measurement by a first water quality detector 7-1 at the bottom of the water inlet channel 1-1, and the first water quality detector 7-1 judges transmitted data C 1:
Wherein, C 1 is the ammonia nitrogen concentration before sewage purification; c 1 =90 mg/L;
C Feeding in is ammonia nitrogen concentration of the incoming wetland, C Feeding in =20mg/L;
C 1>C Feeding in , valves 5-1, 5-3 and 5-4 are opened, and sewage sequentially passes through the first wetland 2-1 and the second wetland 2-2
And a third step of: the sewage flows into the first wetland 2-1 through the water inlet channel 1-1, ammonia nitrogen removal is enhanced through an aeration system, the dissolved oxygen content=7mg/L, and the aeration system is closed;
Fourth step: the sewage enters the second wetland 2-2 through a valve 5-3 between the first wetland 2-1 and the second wetland 2-2, and nitrogen removal and greenhouse emission reduction are enhanced through iron-based technology;
fifth step: the treated effluent is discharged to a water outlet channel 3-1;
Sixth step: the water quality of the effluent is measured by a second water quality detector 7-2 at the bottom of the water outlet channel 3-1, and the second water quality detector 7-2 judges the transmitted data C 2: c 2＞C Out of , the valves 5-5 and 5-6 are opened, and the outlet water flows back to the water inlet channel 1-1 through the return pipe 4 for purification again.
Wherein, C 2 is the total nitrogen concentration after sewage purification; c 2 =10 mg/L;
C Out of is the total nitrogen concentration of the wetland, C Out of =5 mg/L.
Seventh step: the sewage is subjected to water quality measurement by a first water quality detector 7-1 at the bottom of the water inlet channel 1-1, and the first water quality detector 7-1 judges transmitted data C 3:
wherein, C 3 is the ammonia nitrogen concentration before sewage purification; c 3 =6 mg/L;
C Feeding in is ammonia nitrogen concentration of the incoming wetland, C Feeding in =20mg/L;
C 3＜C Feeding in , opening the valves 5-2 and 5-4, and allowing sewage to pass through the second wetland 2-2;
Eighth step: the sewage is treated by the second wetland 2-2 and then discharged to the water outlet channel 3-1;
Ninth step: the water quality of the effluent is measured by a second water quality detector 7-2 at the bottom of the water outlet channel 3-1, and the second water quality detector 7-2 judges the transmitted data C 4: c 4＜C Out of , discharging the water body from the water outlet channel 3-1.
Wherein, C 4 is the total nitrogen concentration after sewage purification; c 4 =1 mg/L;
C Out of is the total nitrogen concentration of the wetland, C Out of =5 mg/L.
Example 4
The difference from example 1 is that:
Total nitrogen concentration after sewage purification; c 2 = 40mg/L.
Wherein the concentration of NO 3 -N is 30mg/L.
The effluent NO 3 -N is abnormal in data, and the water purification substrate of the second wetland 2-2 needs to be supplemented or replaced.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present utility model. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present utility model is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present utility model.
Claims (10)
1. An artificial wetland system for strengthening iron-based carbon release denitrification and greenhouse emission reduction, which is characterized by comprising:
The water inlet module, the water purifying module and the water outlet module are connected in sequence; the outlet of the water outlet module is connected with a drain pipe or a return pipe, and the other end of the return pipe is connected to the water inlet module;
The return pipe is arranged between the water inlet module and the water outlet module;
The water purification module comprises a plurality of wetlands, and valves for water inflow are arranged between each wetland and the water inlet channel and between each wetland; the other end of at least one wetland is provided with a valve for water outflow; and adjusting each wetland to be in parallel connection or series connection by controlling the opening and closing of the valve.
2. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to claim 1, wherein the constructed wetland system is characterized in that: the water inlet module is a water inlet channel, and the water outlet module is a water outlet channel.
3. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to claim 1, wherein the constructed wetland system is characterized in that: the water purification module comprises a first wetland and a second wetland.
4. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to claim 1, wherein the constructed wetland system is characterized in that: and water quality detectors are respectively arranged at the bottom of the water inlet channel and the bottom of the water outlet channel.
5. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to claim 3, wherein the constructed wetland system is characterized in that: the first wetland is a common aeration wetland, and a water purification substrate layer is paved in the second wetland, and comprises a lower substrate layer and an upper substrate layer, wherein aquatic plants are planted on the upper substrate layer.
6. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to claim 5, wherein the constructed wetland system is characterized in that: the aquatic plant is one or more of rhizoma Acori Graminei, flos Farfarae, rhizoma Iridis Tectori and canna.
7. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to claim 5, wherein the constructed wetland system is characterized in that: the planting density of the aquatic plants is 20-40 plants/m 2.
8. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to claim 5, wherein the constructed wetland system is characterized in that: the upper matrix layer filler is common gravel; the filler of the lower matrix layer is iron-based biochar.
9. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to claim 8, wherein the constructed wetland system is characterized in that: the particle size range of the common gravel is 10-20mm; the particle size range of the iron base is 5-10mm, the particle size range of the biochar is 5-10mm, and the specific surface area of the biochar is 10-1000m 2/g.
10. The reinforced iron-based carbon-releasing denitrification and greenhouse emission reduction constructed wetland system according to any one of claims 5 to 9, wherein: the height of the lower substrate layer is h 1 and 10-20 cm; the height of the upper substrate layer is h 2 and 20-30 cm.
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| CN116903145A (en) * | 2023-08-14 | 2023-10-20 | 中交上海航道勘察设计研究院有限公司 | A constructed wetland system and method that enhances iron-based carbon release, denitrification and greenhouse emission reduction |
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