CN115180722A - Method for determining pollution and carbon reduction working condition of micro-polluted water surface flow constructed wetland - Google Patents
Method for determining pollution and carbon reduction working condition of micro-polluted water surface flow constructed wetland Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
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- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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- C02F2209/16—Total nitrogen (tkN-N)
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Abstract
The invention discloses a method for determining pollution and carbon reduction working conditions of a micro-polluted water surface flow constructed wetland, which comprises the following steps: building a surface flow constructed wetland small test system; configuring wetland operation conditions; collecting water inflow and water outflow samples and greenhouse gas samples of each surface flow constructed wetland lab scale system; measuring the water quality index and the greenhouse gas concentration of each surface flow constructed wetland lab scale system; accounting the pollutant removal rate, the greenhouse gas release flux and the global warming potential value of each surface flow constructed wetland small test system; and determining the optimal operation condition of each surface flow constructed wetland small test system. The invention combines the research status of the micro-polluted water treatment technology, quantitatively evaluates the purification effect of the micro-polluted water surface flow artificial wetland, determines the optimal operation condition of the surface flow artificial wetland, has the advantages of strong applicability, easy operation and the like, is suitable for popularization and use, and has guiding significance for micro-polluted water treatment, surface flow artificial wetland design construction and operation management and reduction of greenhouse gas emission.
Description
Technical Field
The invention relates to a micro-polluted water treatment and surface flow constructed wetland treatment effect evaluation technology, in particular to a method for determining pollution and carbon reduction working conditions of a micro-polluted water surface flow constructed wetland.
Background
The micro-polluted water is polluted by organic matters, part of water quality indexes exceed the class III water standard of GB3838-2002 surface water environmental quality standard, the phenomena of higher organic matter content and seasonal overproof ammonia nitrogen and total phosphorus concentration are shown, and the micro-polluted water has the water quality characteristic of low carbon and high nitrogen. Aiming at the characteristic of low concentration of pollutants in micro-polluted water, the water quality improvement and maintenance of the micro-polluted water source by utilizing the surface flow artificial wetland is a common effective measure. However, the treatment effect of the surface flow constructed wetland is influenced by both natural conditions and artificial regulation, the running conditions such as the composition of water inlet nitrogen, the hydraulic retention time, the plant density and the like are different, and the wetland treatment efficiency, the plant growth and the microbial reaction are also different. When the artificial wetland is used for wastewater and sewage treatment, the oxygen kinetics, the hydrological conditions and the microbial process are changed, and the generation and the emission of greenhouse gases of the artificial wetland are promoted or inhibited, so that the contribution amount to the global warming is correspondingly increased or reduced. Researches show that the greenhouse gas emission per unit area of the artificial wetland is approximately 2-10 times of that of the natural wetland, and water pollution is transferred to atmospheric pollution, so that the comprehensive environmental effect of the artificial wetland is greatly reduced. The difference of the greenhouse gas emission amount may be related to various factors such as the type of the artificial wetland, the operation condition, the hydraulic load, the water level, the carbon-nitrogen ratio, the climate environment and the like. Therefore, quantitative research on factors such as influent nitrogen composition, plant density, hydraulic retention time and the like is particularly necessary for the water purification effect of the surface flow constructed wetland and the influence of the surface flow constructed wetland on greenhouse gas emission.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a method for determining the pollution and carbon reduction working condition of a micro-polluted water surface flow constructed wetland.
The technical scheme is as follows: the invention relates to a method for determining pollution and carbon reduction working conditions of a micro-polluted water surface flow constructed wetland, which comprises the following steps of:
s1, constructing a surface flow constructed wetland small test system, which comprises a determination experiment device, collecting bottom mud, removing impurities, homogenizing, flatly paving the homogenized bottom mud in the experiment device, transplanting emergent aquatic plants with similar growth vigor into the experiment device, and pre-culturing the surface flow constructed wetland small test system by feeding water;
s2, configuring the operation condition of the surface flow constructed wetland lab scale system, and determining the COD of the inlet water according to the experiment requirements Mn Concentration, TN concentration and TP concentration, and name of wastewater preparation drug, pH of inlet water is 7-8, and inlet water nitrogen composition including inlet water NH is determined 4 + -N and NO 3 - -a ratio of N; determining the density of the plant; determining hydraulic retention time;
s3, collecting water samples and greenhouse gas samples of the surface flow artificial wetland small test systems, collecting water inflow and water outflow water quality samples of the small test systems within the set corresponding hydraulic retention time, and simultaneously collecting greenhouse gas samples of the small test systems, wherein each experimental group is provided with a plurality of parallel samples;
s4, measuring the water quality index concentration and the greenhouse gas concentration of each surface flow constructed wetland lab scale system, wherein the water quality monitoring index is a basic physicochemical index and COD Mn 、NH 4 + -N、NO 3 - N, TN and TP, greenhouse gas index CO 2 、CH 4 And N 2 O；
S5, calculating the removal rate of pollutants consisting of different plant densities, different hydraulic retention times and different water inlet nitrogen elements of each surface flow constructed wetland small test system, wherein the pollutants comprise COD (chemical oxygen demand) Mn 、NH 4 + -N、NO 3 - -N, TN and TP, accounting for the greenhouse gas CH 4 、CO 2 And N 2 O, releasing flux, and accounting for the global warming potential value;
s6, determining the optimal operation condition of each surface flow constructed wetland small test system, including determining the plant density and the hydraulic retention time of the highest removal rate of pollutants in each surface flow constructed wetland small test system under different water inlet nitrogen composition conditions, and simultaneously determining the minimum greenhouse gas release amount under corresponding conditions.
Further, step S1 specifically includes:
the method comprises the steps of paving bottom mud with preset thickness at the bottom of an experimental device, selecting emergent aquatic plants with similar height and growth vigor, transplanting the emergent aquatic plants into the experimental device to serve as experimental groups, setting 3 groups of parallel samples for each experimental group, setting 3 groups of plant-free control groups for each experimental group, placing the experimental groups and the plant-free control groups into an artificial greenhouse for pre-culturing for 1-3 months, and injecting simulated micro-polluted water to start an experiment after a system is stabilized.
Further, step S2 specifically includes:
the inlet water adopts artificially configured simulated micro-polluted water, the inlet water nitrogen composition is set according to the experimental requirement, and the pH value of the inlet water is kept between 7 and 8; setting each experimental group by adopting a single variable principle, setting different plant densities in a plurality of groups of experimental devices, and setting different hydraulic retention times and different water inlet nitrogen compositions in a plurality of groups of experimental devices with the same plant density; all experimental groups are consistent in other conditions except that hydraulic retention time, water inlet nitrogen composition and plant density are different, and the water inlet concentration of all plant-free control groups is consistent with that of the corresponding experimental group.
Further, in the step S3, the greenhouse gas sample is collected by static box-gas chromatography, and the temperature and pressure in the box are recorded while the greenhouse gas sample is collected.
Further, COD in step S4 Mn Determined by potassium permanganate oxidation titration method, NH 4 + -N is determined by means of Naeser reagent spectrophotometry, NO 3 - and-N is measured by using inorganic anions in water, TN is measured by using an alkaline potassium persulfate digestion spectrophotometry, TP is measured by using an ammonium molybdate spectrophotometry, and a monitoring method of greenhouse gas monitoring indexes is gas chromatography.
Further, the pollutant removal rate calculation formula in step S5 is:
wherein R is the pollutant removal rate; c in The water inlet concentration of the system is obtained; c out The concentration of the effluent of the system is shown.
Further, CH in step S5 4 、CO 2 And N 2 The formula for calculating the change of O release flux is as follows:
wherein F is the gas flux; m is the gas molar mass, P is the sampling point gas pressure, T is the absolute temperature during sampling, V0, P0 and T0 are the gas molar volume, the air pressure and the absolute temperature under an ideal gas standard state respectively, and dc/dt is the slope of the gas concentration changing along with time during sampling; h is the gas height in the sampling box.
Further, the global warming potential calculation formula in step S5 is:
C CO2-eqv ＝25C CH4 +298C N2O +C CO2 ；
wherein, C CO2-eqv Is greenhouse gas emission, C CH4 Is CH 4 Cumulative amount of seasons, C N2O Is N 2 Cumulative amount in season O, C CO2 Is CO 2 Cumulative amount of seasons.
The invention relates to a pollution-reducing and carbon-reducing working condition determining system for a micro-polluted water surface flow constructed wetland, which comprises:
surface current constructed wetland lab scale system, including multiunit experiment group and no plant contrast group, set up a plurality of contrast experiment groups respectively according to the wetland operating condition of difference in the multiunit experiment group, wetland operating condition includes plant density, water conservancy dwell time, the nitrogen composition of intaking includes the NH of intaking 4 + -N and NO 3 - -a ratio of N;
the system comprises a data acquisition module, a data storage module and a data processing module, wherein the data acquisition module is used for acquiring water samples and greenhouse gas samples of each surface flow artificial wetland small test system, acquiring inlet water quality samples and outlet water quality samples of each surface flow artificial wetland small test system within the set corresponding hydraulic retention time, simultaneously acquiring the greenhouse gas samples of each surface flow artificial wetland small test system, recording the temperature and air pressure of the day of sampling and the temperature and air pressure in a greenhouse gas acquisition box, and setting 3 parallel samples for each experiment group;
a test module for measuring the water quality index concentration and greenhouse gas concentration of each surface flow constructed wetland small test system, wherein the water quality monitoring index is a basic physicochemical index, COD Mn 、NH 4 + -N、NO 3 - N, TN, TP, greenhouse gas index CO 2 、 CH 4 、N 2 O；
And the data accounting module is used for accounting the pollutant removal rate, the greenhouse gas release flux and the global warming potential value of each surface flow constructed wetland small test system and determining the optimal operation condition of each surface flow constructed wetland small test system.
Has the advantages that: compared with the prior art, the invention has the technical effects that: (1) The invention determines a method for determining the pollution and carbon reduction operation condition of the artificial wetland for treating the surface flow of the micro-polluted water, and establishes a pollution and carbon reduction benefit evaluation system of the surface flow artificial wetland system; (2) The operating conditions of the surface flow constructed wetland system for treating the micro-polluted water are configured as follows: plant density, hydraulic retention time, influent nitrogen composition (influent NH) 4 + -N and NO 3 - -N proportion), selecting the working condition with the highest pollutant removal rate and the smallest greenhouse gas release amount of the surface flow artificial wetland system according to the accounting system for the pollution and carbon reduction effects of the surface flow artificial wetland, thereby achieving the effect of treating the pollution and carbon reduction of the surface flow artificial wetland system with micro-polluted water; (3) The invention combines the research status of the surface flow artificial wetland purification micro-polluted water, quantitatively evaluates and treats the micro-polluted water surface flow artificial wetland purification effect and the greenhouse gas emission amount, determines the optimal operation condition of the surface flow artificial wetland, has the advantages of strong applicability, easy operation and the like, is suitable for popularization and use, and has guiding significance for micro-polluted water treatment, surface flow artificial wetland design construction, operation management and reduction of greenhouse gas emission.
Drawings
FIG. 1 is a flow chart of the method of the present invention;
FIG. 2 is a schematic view of a test apparatus in an embodiment of the present invention;
fig. 3 is a schematic view of an artificial greenhouse in the embodiment of the invention.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
The invention discloses a method for determining pollution reduction and carbon reduction working conditions of a slightly polluted water surface flow artificial wetland, which is characterized in that the plant density, the hydraulic retention time and the water inlet nitrogen composition (water inlet NH) of a surface flow artificial wetland system are configured 4 + -N and NO 3 - -N proportion), collecting water inlet samples, water outlet samples and greenhouse gases of each surface flow artificial wetland system, measuring water quality indexes and greenhouse gas concentrations, and calculating the removal rate of pollutants in the system, the release flux of the greenhouse gases and the global warming potential value so as to determine the optimal operation condition of each surface flow artificial wetland system. As shown in fig. 1, the method specifically comprises the following steps:
s1, constructing a surface flow artificial wetland small test system, which comprises bottom mud homogenization, transplanting emergent aquatic plants with similar growth vigor and water inlet pre-culture of the surface flow artificial wetland small test system; specifically, the method comprises the following steps:
determining an experimental device, collecting bottom mud, removing impurities such as stones and the like, homogenizing, paving the bottom mud at the bottom of the experimental device, wherein the thickness of the bottom mud is 10-15cm, selecting reeds with the height close to the growth vigor, transplanting the reeds into the experimental device, simultaneously setting a plant-free control group and a standby plant group, pre-culturing in an artificial greenhouse for 2-3 months, supplementing natural evaporation water in 1-3 weeks at the early stage of the pre-culture to tap water, supplementing 5cm at afternoon every day, keeping the water inlet depth to be 5cm, timely cleaning withered plants and supplementing and planting standby plants with similar growth vigor. After the plant growth condition is good, injecting simulated micro-polluted water, carrying out a pre-experiment for 1-3 weeks, wherein the hydraulic retention time of the pre-experiment is 5-7 days, the water depth of inlet water is 10cm, determining the water quality of inlet water and outlet water, and considering that the system is stable if the water quality of outlet water has no significant statistical difference for several times, and starting formal experiments;
s2, configuring the operation condition of the surface flow artificial wetland small test system, and determining the COD (chemical oxygen demand) of the inlet water according to the experiment requirement Mn Concentration ofTN concentration, TP concentration and name of wastewater preparation medicine, the pH of the inlet water is kept between 7 and 8, and the nitrogen composition (NH of the inlet water) of the inlet water is determined 4 + -N and NO 3 - -N ratio); determining the plant density; determining hydraulic retention time; specifically, the method comprises the following steps:
preparing pure water as water simulating slightly polluted water, wherein carbon is provided by glucose or sucrose, phosphorus is provided by potassium dihydrogen phosphate, and nitrogen is provided by ammonium chloride and potassium nitrate (or sodium nitrate); the plant density is 0, 25 plants/m 2 50 strains/m 2 Etc., can be adjusted according to actual conditions; the hydraulic retention time is 1, 3, 5, 7, 14 days and the like, and can be adjusted according to actual conditions.
S3, collecting water samples and greenhouse gas samples of the surface flow constructed wetland small test system, wherein the water samples comprise inflow water quality samples, outflow water quality samples and greenhouse gas samples; specifically, the method comprises the following steps:
collecting different water inlet nitrogen compositions (water inlet NH) in the corresponding set hydraulic retention time 4 + -N and NO 3 - The proportion of-N), the plant density and the corresponding plant-free control group are 500ml of water samples covered on each surface flow constructed wetland small test system, 10-100ml of greenhouse gas samples are collected simultaneously, 3 parallel samples are arranged on all the surface flow constructed wetland small test systems, and the collected samples are quickly transferred to a refrigerator for refrigeration.
S4, measuring the water quality index concentration and the greenhouse gas concentration of each surface flow constructed wetland lab-scale test system, wherein the water quality monitoring index is a basic physicochemical index, COD (chemical oxygen demand) Mn Ammonia nitrogen, TN and TP, and the index of greenhouse gas is CO 2 、CH 4 、N 2 O, completing the measurement of all samples within 48h as much as possible; specifically, the method comprises the following steps:
(1) Physical and chemical indexes (COD) based on water quality monitoring index Mn 、NH 4 + -N、NO 3 - N, TN and TP. The basic physical and chemical indexes can be detected by a portable multi-parameter water quality analyzer, including water temperature, DO, pH, ORP, turbidity, conductivity and the like, and COD Mn Determined by potassium permanganate oxidation titration method, NH 4 + -N is determined by means of Naeser reagent spectrophotometry, NO 3 - With inorganic anions in water as-NThe determination (ion chromatography), TN adopts alkaline potassium persulfate digestion spectrophotometry, TP adopts ammonium molybdate spectrophotometry, and the specific method refers to Water and wastewater monitoring and analysis method (national environmental protection headquarter, 2002);
(2) The greenhouse gas monitoring index is CO 2 、CH 4 、N 2 O, the monitoring method is gas chromatography;
s5, accounting the removal rate of pollutants in each system, the release flux of greenhouse gases and the global warming potential value;
calculating the pollutant removal rate of each water quality index according to a pollutant removal formula, and calculating greenhouse gas release flux and global warming potential values according to greenhouse gas monitoring concentration; the method specifically comprises the following steps:
(1) And (3) calculating the pollutant removal rate of each system in different water depths, different plant densities and different hydraulic retention times, wherein the pollutant removal rate calculation formula is as follows:
wherein, R is pollutant removal rate (%); c in The system water inlet concentration (mg.l) -1 )；C out The concentration (mg.l) of effluent of the system -1 )；
(2)CH 4 、CO 2 And N 2 The formula for calculating the change of the O flux is as follows:
wherein F is the gas flux (mg. M) -2 ·h -1 ) (ii) a M is the gas molar mass (g.mol) -1 ) P is the sampling point gas pressure (Pa), T is the absolute temperature (K) at the time of sampling, and V0, P0 and T0 are the gas molar volumes (L. Mol) in the ideal gas standard state -1 ) Air pressure (Pa) and absolute temperature (K), wherein dc/dt is the gradient of the gas concentration along with time during sampling; h is the gas height (cm) in the sampling box;
(3) The global warming potential calculation formula is as follows:
in one hundred year scale, CH is contained in greenhouse gas released by wetland ecosystem 4 Has a greenhouse effect of CO 2 25 times of, N 2 Greenhouse effect of O is CO 2 298 times of. According to the standard, CO released by wetland in the growing period 2 、CH 4 、N 2 Three greenhouse gas emissions (in terms of CO) 2 Gas meter) and the contribution rate are calculated, and the formula is as follows:
C CO2-eqv ＝25C CH4 +298C N2O +C CO2 (3)；
wherein, C CO2-eqv For greenhouse gas emission (by CO) 2 Meter) (g.m -2 )，C CH4 Is CH 4 Cumulative amount of seasons (g.m) -2 )， C N2O Is N 2 Cumulative amount in O season (g.m) -2 )，C CO2 Is CO 2 Cumulative amount of seasons (g.m) -2 )。
S6, determining the optimal operation condition of each surface flow constructed wetland small test system, including determining the optimal hydraulic retention time and the optimal plant density;
determining the plant density and the hydraulic retention time of the highest removal rate of the pollutants in each wetland system under different water inlet conditions, and simultaneously determining the minimum greenhouse gas release amount under the corresponding conditions.
The invention relates to a pollution-reducing and carbon-reducing working condition determining system for a micro-polluted water surface flow constructed wetland, which comprises the following steps:
surface current constructed wetland lab scale system, including multiunit experiment group and no plant control group, set up a plurality of contrast experiment groups respectively according to the wetland operating condition of difference in the multiunit experiment group, wetland operating condition includes plant density, water conservancy dwell time, the nitrogen element of intaking constitutes including the NH of intaking 4 + -N and NO 3 - -a ratio of N;
the system comprises a data acquisition module, a data analysis module and a data analysis module, wherein the data acquisition module is used for acquiring water samples and greenhouse gas samples of each surface flow artificial wetland small test system, acquiring inlet water quality samples and outlet water quality samples of each surface flow artificial wetland small test system within the set corresponding hydraulic retention time, simultaneously acquiring greenhouse gas samples of each surface flow artificial wetland small test system, recording the temperature and air pressure of the sampling day and the temperature and air pressure in a greenhouse gas acquisition box, and each experiment group is provided with 3 parallel samples;
a test module for measuring the water quality index concentration and greenhouse gas concentration of each surface flow constructed wetland lab scale system, wherein the water quality monitoring index is a basic physicochemical index, COD Mn 、NH 4 + -N、NO 3 - N, TN, TP, greenhouse gas index CO 2 、 CH 4 、N 2 O；
And the data accounting module is used for accounting the pollutant removal rate, the greenhouse gas release flux and the global warming potential value of each surface flow constructed wetland small test system and determining the optimal operation condition of each surface flow constructed wetland small test system.
The embodiment is as follows:
s1, building a surface flow constructed wetland small test system;
the experiment is carried out on a salt dragon lake drinking water source, the experimental device is a water bucket with the diameter of 40cm and the height of 50cm, and a round hole with the diameter of 1cm is formed at a position 10cm away from the bottom of the bucket so as to facilitate water drainage (as shown in figure 2). Collecting 0-15cm bottom mud on the original surface layer of the Yanlong lake, covering a container with a cover after sampling, wrapping the container with tinfoil, and quickly transporting the container back to a laboratory. Removing impurities such as stones, homogenizing, and spreading bottom mud at the bottom of the barrel to a thickness of 15cm. Selecting reed from emergent aquatic plant, transplanting reed with height similar to growth vigor into barrel, and setting no-plant control group. All plants were pre-cultured in artificial greenhouses (as shown in fig. 3), and after the system was stabilized, simulated micro-polluted water was injected to start the experiment.
S2, configuring wetland operation conditions;
configuring wetland operation conditions: the plant density is 2, 6 and 10 plants/barrel, and the hydraulic retention time is 1d, 3d, 5d and 7d.
Configuring wetland water inlet conditions: the inlet water adopts artificially configured simulated micro-polluted water, the experimental water is pure water, the inlet water C/N is 1, TN is 1.5mg/L, and TP is 0.15mg/L. Simulating COD in micro-polluted water Mn 、NH 4 + -N、NO 3 - N and TP are respectively composed of sucrose and NH 4 Cl、KNO 3 And KH 2 PO 4. The composition of the influent nitrogen is set to be high NO 3 - Group N (NH) 4 + /NO 3 - = 0) high NH 4 + Group N (NH) 4 + /NO 3 - =0.7 4 + / NO 3 - = 4).
Table 1 test water entry parameters
S3, collecting water samples of the surface flow artificial wetland small test system and greenhouse gas samples;
gather water sample and gas sample respectively at experiment 1, 3, 5, 7d 11 am, every experimental group all sets up 3 parallel appearance, all sample collection after the cold-stored and send to the laboratory immediately, gas sample collection is static case-meteorological chromatography, the box height is according to plant height customization, detain the box and seal the processing after the first sample of collection with 100ml syringe, later gather 1 gas sample every 20min in 1h, gather 3 times totally, gather temperature, atmospheric pressure in the record case when gaseous sample.
S4, measuring the water quality index concentration and the greenhouse gas concentration of each surface flow constructed wetland small test system;
monitoring the basic physicochemical indexes and COD of the surface flow constructed wetland lab scale test system according to the water quality index measuring method Mn 、NH 4 + -N、NO 3 - -N, TN and TP concentrations, CO monitoring according to the greenhouse gas assay 2 、CH 4 、N 2 O concentration, the specific concentration is as follows:
TABLE 2 test of physical and chemical indexes of water outlet
TABLE 3TN influent and effluent concentrations (mg/L)
TABLE 4NH 4 + -N Water in and out concentration (mg/L)
TABLE 5NO 3 - -N Water in and out concentration (mg/L)
TABLE 6COD Mn Concentration of inlet and outlet water (mg/L)
TABLE 7TP Water in and out concentrations (mg/L)
TABLE 8 greenhouse gas concentrations (plant density 6 plants) (ppm) for different influent nitrogen compositions
Table 9 different plant density greenhouse gas concentrations (influent nitrogen composition 0.7
S5, accounting the pollutant removal rate, the greenhouse gas release flux and the global warming potential value of each surface flow constructed wetland small test system;
calculating the removal rate of various pollutants of each surface flow constructed wetland small test system under the working conditions of different water inlet nitrogen compositions, different hydraulic retention times and different plant densities according to a formula (1), wherein the pollutant removal rate data are shown in tables 10-14; and calculating different water inlet nitrogen compositions, different plant density greenhouse gas concentrations and corresponding global warming potential values of each surface flow constructed wetland small test system according to the formula (2) and the formula (3), and specifically shown in tables 15 and 16.
TABLE 10TN removal (%)
TABLE 11NH 4 + -N removal (%)
TABLE 12NO 3 - -N removal (%)
TABLE 13COD Mn Removal Rate (%)
TABLE 14TP removal (%)
TABLE 15 Nitrogen composition of different feed waters CO 2 、CH 4 、N 2 Flux of O evolution and global warming potential value
| Composition of influent nitrogen | CH 4 /(mg/m 2 /h) | CO 2 /(mg/m 2 /h) | N 2 O/(μg/m 2 /h) | GWP/(g/m 2 ) |
| 0:1 | 13.80 | -776.449 | -9.03756 | -434.196 |
| 0.7:1 | 20.48 | -400.256 | 124.726 | 149.0237 |
| 4:1 | 8.81 | 75.49722 | -0.01495 | 295.656 |
TABLE 16 different plant Density CO 2 、CH 4 、N 2 Flux of O evolution and global warming potential value
| Density of plants | CH 4 /(mg/m 2 /h) | CO 2 /(mg/m 2 /h) | N 2 O/(μg/m 2 /h) | GWP/(g/m 2 ) |
| 0 | 1.55 | 406.8345 | 118.62 | 480.9867 |
| 2 | 13.59 | -489.372 | -0.55 | -149.771 |
| 6 | 3.62 | -592.004 | -51.36 | -516.841 |
| 10 | 6.25 | -1243.77 | -120.40 | -1123.42 |
S6, determining the optimal operation condition of each surface flow constructed wetland small test system;
analysis of the above data leads to the following conclusions:
(1) The wetland system consisting of different water inlet nitrogen elements can stay TN and NH along with the extension of the hydraulic retention time under the same plant density 4 + -N、NO 3 - The removal rates of-N all showed a gradual increase, the maximum removal rate was reached on the fifth day, and the optimal hydraulic retention time was determined to be 5 days.
(2) The removal effect of each pollutant is better when the plant density is 2 plants under the condition of the same hydraulic retention time by a wetland system consisting of different water inlet nitrogen elements, the optimal plant density is determined to be 2 plants/barrel and is converted into 25 plants/m 2 。
(3) When the hydraulic retention time is 5 days and the plant density is 2 plants/barrel, the NH content of the three forms of water inlet nitrogen is high 4 + The removal effect of the TN in the N groups is better, and the global warming potential value is lower.
The working conditions of the highest pollutant removal rate, the lowest greenhouse gas release amount and the global warming potential value of the wetland system composed of different water inlet nitrogen are integrated, namely the hydraulic retention time is 5 days, and the plant density is 2 plants/barrel.
Claims (9)
1. A method for determining pollution and carbon reduction working conditions of a micro-polluted water surface flow constructed wetland is characterized by comprising the following steps:
s1, constructing a surface flow constructed wetland small test system, which comprises a determination experiment device, collecting bottom mud, removing impurities, homogenizing, flatly paving the homogenized bottom mud in the experiment device, transplanting emergent aquatic plants with similar growth vigor into the experiment device, and pre-culturing the surface flow constructed wetland small test system by feeding water;
s2, configuring the operation condition of the surface flow constructed wetland lab scale system, and determining the COD of the inlet water according to the experiment requirements Mn Concentration, TN concentration and TP concentration, and name of wastewater preparation drug, pH of inlet water is 7-8, and inlet water nitrogen composition including inlet water NH is determined 4 + -N and NO 3 - -a ratio of N; determining the plant density; determining hydraulic retention time;
s3, collecting water samples and greenhouse gas samples of the surface flow constructed wetland small test systems, collecting water inlet and outlet quality samples of the small test systems in the set corresponding hydraulic retention time, and simultaneously collecting greenhouse gas samples of the small test systems, wherein each experimental group is provided with a plurality of parallel samples;
s4, measuring the water quality index concentration and the greenhouse gas concentration of each surface flow constructed wetland lab scale system, wherein the water quality monitoring index is a basic physicochemical index and COD Mn 、NH 4 + -N、NO 3 - N, TN and TP, greenhouse gas index CO 2 、CH 4 And N 2 O；
S5, calculating the removal rate of pollutants consisting of different plant densities, different hydraulic retention times and different water inlet nitrogen elements of each surface flow constructed wetland small test system, wherein the pollutants comprise COD (chemical oxygen demand) Mn 、NH 4 + -N、NO 3 - -N, TN and TP, accounting for the greenhouse gas CH 4 、CO 2 And N 2 O, releasing flux, and accounting for the global warming potential value;
s6, determining the optimal operation condition of each surface flow constructed wetland small test system, including determining the plant density and the hydraulic retention time of the highest removal rate of pollutants in each surface flow constructed wetland small test system under different water inlet nitrogen composition conditions, and simultaneously determining the minimum greenhouse gas release amount under corresponding conditions.
2. The method for determining the pollution-reducing and carbon-reducing working condition of the constructed wetland with the micro-polluted water surface flow according to claim 1, wherein the step S1 is specifically as follows:
the method comprises the steps of paving bottom mud with preset thickness at the bottom of an experimental device, selecting emergent aquatic plants with similar height and growth vigor, transplanting the emergent aquatic plants into the experimental device to serve as experimental groups, setting 3 groups of parallel samples for each experimental group, setting 3 groups of plant-free control groups for each experimental group, placing the experimental groups and the plant-free control groups into an artificial greenhouse for pre-culturing for 1-3 months, and injecting simulated micro-polluted water to start an experiment after a system is stabilized.
3. The method for determining the pollution-reducing and carbon-reducing working condition of the micro-polluted water surface flow constructed wetland according to claim 1, wherein the step S2 is specifically as follows:
the inlet water adopts artificially prepared simulated micro-polluted water, the inlet water nitrogen composition is set according to the experimental requirements, and the pH of the inlet water is kept between 7 and 8; setting each experimental group by adopting a single variable principle, setting different plant densities in a plurality of groups of experimental devices, and setting different hydraulic retention times and different water inlet nitrogen compositions in a plurality of groups of experimental devices with the same plant density; all experimental groups are consistent in other conditions except that hydraulic retention time, water inlet nitrogen composition and plant density are different, and the water inlet concentration of all plant-free control groups is consistent with that of the corresponding experimental group.
4. The method for determining the pollution-reducing and carbon-reducing working condition of the constructed wetland with the slightly polluted water surface flow as claimed in claim 1, wherein in the step S3, the greenhouse gas sample is collected by static box-gas chromatography, and the temperature and the pressure in the box are recorded while the greenhouse gas sample is collected.
5. According to claim 1The method for determining the pollution-reducing and carbon-reducing working condition of the artificial wetland on the surface flow of the micro polluted water is characterized in that COD (chemical oxygen demand) in the step S4 Mn Determined by potassium permanganate oxidation titration method, NH 4 + -N is determined by means of Naeser reagent spectrophotometry, NO 3 - And (3) determining-N by using inorganic anions in water, determining TN by using an alkaline potassium persulfate digestion spectrophotometry, determining TP by using an ammonium molybdate spectrophotometry, and determining a greenhouse gas monitoring index by using a gas chromatography.
6. The method for determining the pollution-reducing and carbon-reducing working condition of the micro-polluted water surface flow constructed wetland according to claim 1, wherein the pollutant removal rate calculation formula in the step S5 is as follows:
wherein R is the pollutant removal rate; c in The water inlet concentration of the system is obtained; c out The concentration of the effluent of the system is shown.
7. The method for determining the pollution-reducing and carbon-reducing working condition of the micro-polluted water surface flow constructed wetland according to claim 1, wherein CH in the step S5 4 、CO 2 And N 2 The formula for calculating the change of O release flux is as follows:
wherein F is the gas flux; m is the gas molar mass, P is the sampling point gas pressure, T is the absolute temperature during sampling, V0, P0 and T0 are the gas molar volume, the air pressure and the absolute temperature under an ideal gas standard state respectively, and dc/dt is the slope of the gas concentration changing along with time during sampling; h is the gas height in the sampling box.
8. The method for determining the pollution-reducing and carbon-reducing working condition of the micro-polluted water surface flow constructed wetland according to claim 1, wherein the global warming potential calculation formula in the step S5 is as follows:
C CO2-eqv ＝25C CH4 +298C N2O +C CO2 ；
wherein, C CO2-eqv For greenhouse gas emissions, C CH4 Is CH 4 Cumulative amount of seasons, C N2O Is N 2 Cumulative amount in season O, C CO2 Is CO 2 Cumulative amount of seasons.
9. The utility model provides a little polluted water surface flow constructed wetland pollution reduction subtracts carbon operating mode determination system which characterized in that includes:
surface current constructed wetland lab scale system, including multiunit experiment group and no plant control group, set up a plurality of contrast experiment groups respectively according to the wetland operating condition of difference in the multiunit experiment group, wetland operating condition includes plant density, water conservancy dwell time, the nitrogen element of intaking constitutes including the NH of intaking 4 + -N and NO 3 - -a ratio of N;
the system comprises a data acquisition module, a data analysis module and a data analysis module, wherein the data acquisition module is used for acquiring water samples and greenhouse gas samples of each surface flow artificial wetland small test system, acquiring inlet water quality samples and outlet water quality samples of each surface flow artificial wetland small test system within the set corresponding hydraulic retention time, simultaneously acquiring greenhouse gas samples of each surface flow artificial wetland small test system, recording the temperature and air pressure of the sampling day and the temperature and air pressure in a greenhouse gas acquisition box, and each experiment group is provided with 3 parallel samples;
a test module for measuring the water quality index concentration and greenhouse gas concentration of each surface flow constructed wetland small test system, wherein the water quality monitoring index is a basic physicochemical index, COD Mn 、NH 4 + -N、NO 3 - N, TN, TP and the greenhouse gas index is CO 2 、CH 4 、N 2 O；
And the data accounting module is used for accounting the pollutant removal rate, the greenhouse gas release flux and the global warming potential value of each surface flow constructed wetland small test system and determining the optimal operation condition of each surface flow constructed wetland small test system.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA852151B (en) * | 1984-03-24 | 1985-12-24 | Perfluktiv Consult Ag | Process and apparatus for the manufacture of activated form coke |
| EP2130426A2 (en) * | 2008-06-05 | 2009-12-09 | Institut für Gemüse- & Zierpflanzenbau e.V. | Method and assembly for carbon dioxide supply of plants cultivated in a greenhouse |
| US8252182B1 (en) * | 2008-09-11 | 2012-08-28 | University Of Central Florida Research Foundation, Inc. | Subsurface upflow wetland system for nutrient and pathogen removal in wastewater treatment systems |
| CN203513429U (en) * | 2013-07-25 | 2014-04-02 | 东华大学 | Compound water purification system of algal-bacterial symbiotic surface flow wetland |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ZA852151B (en) * | 1984-03-24 | 1985-12-24 | Perfluktiv Consult Ag | Process and apparatus for the manufacture of activated form coke |
| EP2130426A2 (en) * | 2008-06-05 | 2009-12-09 | Institut für Gemüse- & Zierpflanzenbau e.V. | Method and assembly for carbon dioxide supply of plants cultivated in a greenhouse |
| US8252182B1 (en) * | 2008-09-11 | 2012-08-28 | University Of Central Florida Research Foundation, Inc. | Subsurface upflow wetland system for nutrient and pathogen removal in wastewater treatment systems |
| CN203513429U (en) * | 2013-07-25 | 2014-04-02 | 东华大学 | Compound water purification system of algal-bacterial symbiotic surface flow wetland |
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