CN217600476U - Sewage treatment system for realizing biomass production and methane collection of aquatic plants - Google Patents
Sewage treatment system for realizing biomass production and methane collection of aquatic plants Download PDFInfo
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- CN217600476U CN217600476U CN202221780616.1U CN202221780616U CN217600476U CN 217600476 U CN217600476 U CN 217600476U CN 202221780616 U CN202221780616 U CN 202221780616U CN 217600476 U CN217600476 U CN 217600476U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The utility model relates to a sewage treatment system for realizing biomass production and methane collection of aquatic plants, which comprises an aquatic plant treatment system body, a water inlet, a water outlet, a gas interception device, a gas collecting tank and a water injection tank; the aquatic plant treatment system body is provided with a cavity with an upward opening; the water inlet pipe and the water outlet pipe are arranged on the side part of the aquatic plant treatment system body; the water inlet of the water inlet pipe is arranged at the lower part of the side wall of the aquatic plant treatment system body; the water outlet of the water outlet pipe is arranged at the upper part of the side wall of the aquatic plant treatment system body; the gas interception device is arranged inside the aquatic plant treatment system body. The method has the advantages of simple operation, low cost, easy operation management, no limitation of duckweed varieties, capability of determining the scale of a duckweed treatment system and the size of the gas interception device and the gas collection tank according to the treatment capacity of sewage, and easy popularization and application.
Description
Technical Field
The utility model belongs to the technical field of sewage purification treatment and clean production; in particular to the technical field of a sewage treatment system structure for realizing the production of aquatic plant biomass and the collection of methane.
Background
In recent years, aquatic plants have been widely used in the field of water pollution control. Among a plurality of aquatic plants, the duckweed which is a small-sized floating plant has the advantages of fast growth, easy salvage, rich protein starch in biomass, capability of being used as a protein feed and a biological energy source raw material and the like, is an ideal plant capable of simultaneously realizing water quality purification, biomass production and nitrogen and phosphorus resource recovery, and is highly concerned and applied.
However, similar to other sewage treatment systems, the duckweed pond treatment system constructed based on duckweed plants also has a prominent problem of greenhouse gas emission, and large-scale popularization and application are not favorable for controlling the greenhouse effect and realizing the double-carbon target in China. Research shows that the greenhouse gas discharged by the duckweed pond is CH 4 Mainly, CH 4 The relative contribution to the comprehensive warming potential of the duckweed pond is as high as 86.70 percent, and the CO content is 2 And N 2 O is only 6.99% and 6.31%, respectively. This is because the photosynthesis of duckweed in the daytime requires a large amount of absorption of CO 2 Can partially offset CO generated at night 2 To make CO in the duckweed pond 2 The discharge amount is less. However, the anoxic environment of the duckweed pond and the large amount of organic pollutants in the sewage certainly provide favorable conditions for the methanogenesis process, so that CH 4 Is generated and discharged more. Therefore, to reduce the contribution of duckweed ponds to the greenhouse effect, it is critical to reduce CH 4 The discharge flux of (c). On the other hand, methane is an important fuelIf the waste water can be recycled, the environmental pollution and the resource waste can be avoided, the economic benefit can be generated, and multiple purposes can be achieved. The existing research shows that the problems of underwater methane generation and transportation of an aquatic ecosystem are paid certain attention, and related patent technologies for underwater methane gas collection exist. For example, chinese patent (publication No. CN 212513817U) discloses a continuous sampling and collecting device and a collecting ship applied to underwater gas and water, the device realizes synchronous collection of gas and water samples at specified depth and position underwater, meets the requirements of laboratory analysis and detection, and solves the problems of difficult collection and small sample amount of the existing underwater gas samples. However, the device can only perform instantaneous sampling on gas dissolved in water, continuous collection and storage of bubbles rising from the water cannot be realized, the device is complex in manufacturing process, needs to use electric power resources, inert gas and the like, is high in cost, and is not suitable for being used in the system because the collecting ship floats on the water surface and is easy to interfere with the growth of duckweeds. In addition, a Chinese patent (publication number: CN 209624166U) discloses an underwater gas collecting device, which mainly comprises a collecting container, a storage container, a suction pump and other parts, although the device can realize the collection and storage of underwater gas, the device can transfer the intercepted gas to the storage container only by manually operating the suction pump, the timely and automatic transfer of the gas cannot be realized, and the operation is complex; in addition, the collecting container of the device needs to be placed at the position where bubbles are emitted from the water surface so as to observe the gas collecting condition and transfer the gas manually in time, and the collecting container placed on the water surface can occupy the living space of duckweeds and is not suitable for being used in the system.
Therefore, aiming at the characteristics of high methane yield of the duckweed sewage treatment system and floating of duckweeds on the surface of a water body, an underwater gas interception and collection technology suitable for the duckweed sewage treatment system is developed, and water purification, duckweed biomass production and CH (CH) can be realized simultaneously under the condition of not influencing the growth of duckweed plants 4 Multiple targets of recycling and emission reduction are achieved, and the method has important practical guiding significance for the construction of a clean and efficient treatment system and the application of the system in water environment pollution treatment and carbon, nitrogen and phosphorus resource recovery.
Disclosure of Invention
The utility model aims at providing a realize aquatic plant biomass production and methane collection's sewage treatment system and method to solve current processing system CH 4 The problem of large loss and discharge flux, the energy recovery efficiency of the treatment system is improved, and the contribution of the treatment system to the greenhouse effect is reduced.
The utility model adopts the following technical scheme to realize.
A sewage treatment system for realizing the production of aquatic plant biomass and the collection of methane, the utility model discloses an aquatic plant treatment system body 1, a water inlet 4, a water outlet 5, a gas interception device 6, a gas collection tank 9 and a water injection tank 14;
the aquatic plant treatment system body 1 is provided with a cavity with an upward opening;
the water inlet pipe and the water outlet pipe are arranged on the side part of the aquatic plant treatment system body 1;
the water inlet 4 of the water inlet pipe is arranged at the lower part of the side wall of the aquatic plant treatment system body 1;
the water outlet 5 of the water outlet pipe is arranged at the upper part of the side wall of the aquatic plant treatment system body 1;
the gas interception device 6 is arranged inside the aquatic plant treatment system body 1;
a gas conduit 8 is arranged between the gas interception device 6 and the gas collection tank 9; a gas gathering point 7 is arranged on the gas interception device 6; one end of the gas conduit 8 is fixedly connected with the gas interception device 6 at the gas collection point 7; the other end of the gas conduit 8 is fixedly connected with the gas collecting tank 9 at the bottom of the gas collecting tank 9;
the upper part of the gas collecting tank 9 is provided with an exhaust pipe 11;
the water injection tank 14 is arranged on one side of the gas collecting tank 9; a water injection pipe 13 is arranged between the gas collecting tank 9 and the water injection tank 14; one end of the water injection pipe 13 is fixedly connected with the bottom of the gas collecting tank 9; the other end of the water injection pipe 13 is fixedly connected to the bottom of the water injection tank 14.
The sewage treatment system of the utility model comprises a plant growth space 2 and a bottom mud layer 3;
the plant growth space 2 is arranged at the opening of the aquatic plant treatment system body 1;
the bottom mud layer 3 is arranged at the bottom of the aquatic plant treatment system body 1.
The position of the water inlet 4 of the utility model is higher than the bottom mud layer 3 and lower than the gas interception device 6; the gas interception device 6 is arranged between the plant growth space 2 and the bottom mud layer 3.
The gas conduit 8 of the utility model is provided with a valve A10; a valve B12 is arranged on the exhaust pipe 11; and a valve C15 is arranged on the water injection pipe.
The cross sectional shape of the gas interception device 6 is matched with the cross sectional shape of the inner cavity of the aquatic plant treatment system body 1.
The bottom of the water injection tank 14 is higher than the top of the gas collection tank 9.
The bottom of the gas collection tank 9 is higher than the aquatic plant growth space 2.
The bottom of the water injection tank 14 and the gas collecting tank 9 is provided with a support 16.
The utility model has the advantages that,
1. the utility model aims at providing a realize aquatic plant biomass production and sewage treatment system and method that methane was collected to solve current processing system CH 4 The problem of large loss and discharge flux, the energy recovery efficiency of the treatment system is improved, and the contribution of the treatment system to the greenhouse effect is reduced.
2. The method of the utility model can realize the mass production of duckweed biomass, and the average dry matter yield of the duckweed biomass exceeds 6g/m 2 /d。
3. The method can realize effective collection of underwater gas of the treatment system, and the gas collection rate exceeds 298mL/m 2 D, collected gas CH 4 The content is more than 24% on average, and the product can be used as fuel after further concentration and purification.
4. The method can effectively reduce CH of the processing system 4 The discharge flux, the reduction rate is more than 70 percent,can greatly relieve the greenhouse effect of the treatment system.
5. The method can effectively reduce CH in the effluent of the treatment system 4 The concentration and the reduction rate are more than 60 percent, and the greenhouse effect of a treatment system can be relieved to a certain extent.
6. The method can effectively improve the removal rate of pollutants (TN, ammonia nitrogen, nitrate nitrogen, TP, COD and turbidity) of the treatment system.
7. The method has the advantages of simple operation, low cost, easy operation management, no limitation of duckweed varieties, capability of determining the scale of a duckweed treatment system and the size of the gas interception device and the gas collection tank according to the treatment capacity of sewage, and easy popularization and application.
The invention will be further explained with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of a sewage treatment system according to embodiment 1;
FIG. 2 is a graph showing the dry weight growth rate of duckweed in comparative examples and examples;
FIG. 3 shows CH in comparative example and example 4 Emission flux and reduction rate show plots;
FIG. 4 shows the effluent CH of comparative example and example 4 Concentration and reduction ratio display plots;
FIG. 5 shows gas throughput (collection rate) and CH in examples 4 Content presentation plots;
FIG. 6 is a graph showing the average removal rate and the improvement rate of TN, ammonia nitrogen, nitrate nitrogen, TP, COD and turbidity in the comparative examples and examples.
In the drawings, the numerical designations respectively denote: 1-an aquatic plant treatment system body, 2-a plant growth space, 3-a bottom mud layer, 4-a water inlet, 5-a water outlet, 6-a gas interception device, 7-a gas collection point, 8-a gas conduit, 9-a gas collection tank, 10-a valve A, 11-an exhaust pipe, 12-a valve B, 13-a water injection pipe, 14-a water injection tank, 15-a valve C and 16-a support.
Detailed Description
The utility model discloses an in aquatic plant processing system (duckweed processing system)A gas interception device is fixedly arranged under the water surface to collect and utilize the gas on the surface of the duckweed processing system and underwater gas so as to solve the problem of the duckweed processing system CH 4 The problems of large loss and large discharge flux are solved, the energy recovery efficiency of the duckweed treatment system is improved, and the result shows that the invention can effectively reduce CH of the duckweed treatment system 4 The discharge flux, the reduction rate is over 70 percent; the underwater gas collection rate exceeds 298mL/m 2 D, collected gas CH 4 The content is more than 24% on average; and can effectively reduce CH in the effluent of the duckweed treatment system 4 Concentration, the reduction rate is over 60 percent. Meanwhile, the gas interception device can effectively improve the removal rate of pollutants (TN, ammonia nitrogen, nitrate nitrogen, TP, COD and turbidity) of the duckweed treatment system, and the removal rate of the nitrate nitrogen can reach more than 15%. In addition, the utility model has simple operation and low cost, is not limited by duckweed varieties, and is favorable for promoting the application of a duckweed treatment system in water environment treatment.
See fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6.
The sewage treatment system comprises an aquatic plant treatment system body 1, an aquatic plant growth space 2 is planted on the water surface of the aquatic plant treatment system body 1, and a bottom mud layer 3 deposited for a long time is arranged at the bottom of the aquatic plant treatment system body 1; the aquatic plant can be selected from herba Spirodelae and fructus Eichhorniae, preferably herba Spirodelae;
the upper end and the lower end of the aquatic plant treatment system body 1 are respectively provided with a water inlet 4 and a water outlet 5, and the bottom end of the water inlet 4 is higher than the bottom mud layer 3;
a gas interception device 6 is arranged in the sewage treatment system body, is arranged below the aquatic plant growth space 2 and is not contacted with the duckweed; the gas intercepting device is provided with a gas collecting point 7 with the highest locus, the gas collecting point is connected with one end of a gas guide pipe 8, the other end of the gas guide pipe 8 is connected with the bottom of a gas collecting tank 9, and a valve A10 is arranged on the gas guide pipe 8; an exhaust pipe 11 is installed at the top of the gas collection tank 9, and a valve B12 is installed on the exhaust pipe 11; the bottom of gas collecting tank 9 installs water injection pipe 13, the other end of water injection pipe 13 links to each other with the bottom of water injection tank 14, install valve C15 on the water injection pipe 13, the bottom of gas intercepting device 6 is higher than sediment layer 3, the bottom of gas collecting tank 9 is higher than aquatic plant growth space 2, the bottom of water injection tank 14 is higher than the top of gas collecting tank 9, gas collecting tank 7 and water injection tank 11 are installed on support 16.
Preferably, the lower edge opening of the gas interception device 6 can be in any shape such as a circle, a square, a rectangle and the like, or can be one or more closely arranged, the specific shape, size and number are determined according to the shape and size of the aquatic plant processing system body 1, so as to cover the underwater area of the whole aquatic plant processing system body 1 as much as possible, if a plurality of gas interception devices 6 are used, the gas distribution duct of each gas interception device 6 needs to be commonly connected to the main gas duct, so that the gases intercepted by all the gas interception devices 6 can be gathered and enter the main gas duct, and enter the gas collection tank 9 through the main gas duct.
Preferably, the gas interception device 6 is installed under water at a higher position as well as a better position without contacting with duckweeds.
Preferably, the position of the water inlet 4 is lower than that of the gas interception device 6, so as to ensure CH generated by anaerobic digestion of high-concentration organic matters in the inlet water 4 Can be intercepted and collected by the gas intercepting device 6.
The utility model discloses a using method of a sewage treatment system, sewage is introduced into an aquatic plant treatment system body 1 through a water inlet 4 for treatment, and is discharged from a water outlet 5 after treatment; aquatic plants are planted in the aquatic plant treatment system body 1 to form an aquatic plant growth space 2; gas collection tank 9 need fill with water before collecting gas, the water injection mode is: after the valve A10 is closed and the valve B12 and the valve C15 are opened, water is injected into the water injection tank 14 continuously, the injected water enters the gas collecting tank 9 through the water injection pipe 13 until the water level in the gas collecting tank 9 reaches the valve B12, the water injection is stopped, the valve B12 and the valve C15 are closed in sequence, and the valve A10 is opened to finish the water injection.
In the sewage treatment process, the bed mud layer 3 and the water body of the duckweed treatment system can generate a large amount of waterContaining CH 4 The gas in the gas collection tank 9 is collected by the gas collection tank 9, the storage bag is connected with the exhaust pipe 11 after the gas collection tank 9 is full of gas, the valve A10 is closed, water is continuously injected into the water injection tank 14 after the valve B12 and the valve C15 are opened, the injected water enters the gas collection tank 9 through the water injection pipe 13, the gas in the gas collection tank 9 is extruded into the storage bag from the exhaust pipe 11 for storage and utilization, the water injection is stopped after the gas in the gas collection tank 9 is completely removed, the valve B12 and the valve C15 are closed in sequence, the valve A10 is opened, the gas collection and water injection work is completed, and the next gas collection work is started.
Preferably, the sewage to be treated is mainly sewage with high organic matter concentration and good biodegradability (such as domestic sewage and aquaculture wastewater), the duckweed is suitable for growing in the sewage, and the duckweed treatment system is used for treating the sewage in the form of CH 4 The generation and discharge amount is large.
Preferably, the coverage rate of the duckweeds in the aquatic plant processing system body 1 is 100-300%, and about 200% is recommended to be optimal so as to obtain the optimal duckweed yield and the optimal pollutant removal effect.
Preferably, the aquatic plant treatment system body 1 is operated in a continuous or semi-continuous mode, namely a certain amount of sewage in the treatment system is changed every day, the sewage is input from the water inlet 4, meanwhile, the treated water body is discharged from the water outlet 5 so as to ensure that the liquid level height is constant, and the change amount is determined according to the sewage concentration and the standard-reaching requirement. Meanwhile, the redundant duckweeds are periodically salvaged, the coverage rate of the duckweeds is ensured to be within a specified range, and the optimal duckweeds yield and the optimal pollutant removal effect are obtained.
Preferably, the water body injected into the gas collecting tank 9 of the water injection tank 14 is selected from the sewage to be treated, on one hand, the water resource can be saved, and on the other hand, the sewage injected into the gas collecting tank 9 can automatically flow into the aquatic plant treatment system body 1 for treatment after being replaced by the collected gas, so that the purpose of discharging after treatment is achieved.
The duckweed treatment system and method for simultaneously realizing duckweed biomass production and methane collection and emission reduction according to the present invention will be further described by the following embodiments and comparative examples.
The following examples and comparative examples were conducted in synchronization, using the same structure and size of the aquatic plant treatment system body 1, the aquatic plant treatment system body 1 being a cylindrical body with an open upper end, an inner diameter of 0.5m and a surface area of 0.19m as shown in FIG. 1 2 And 1.2m higher (1.1 m higher than the actual liquid level). The bottom and the top of the duckweed sewage treatment body 1 are respectively provided with a water inlet 4 and a water outlet 5, the bottom of the duckweed sewage treatment body is provided with a bottom mud layer 3 with the thickness of 5cm, and duckweeds are inoculated on the water surface to form an aquatic plant growth space 2. The following comparative examples and examples differ in that (as in fig. 1): a gas interception device 6 is fixedly arranged under the water surface of the embodiment, the gas interception device is an inverted funnel, the diameter of an opening at the lower end of the gas interception device is 0.4m, and the gas interception device is used for intercepting CH generated in a water body and a sediment layer 4 Physically intercepting the gas; in addition, the gas collecting tank 9 and the water injection tank 14 with effective volumes of 500mL and 250mL are fixedly arranged outside the aquatic plant treatment system body of the embodiment, and are connected by a guide pipe with the inner diameter of 1cm, and a valve with a corresponding specification is arranged on the guide pipe. Whereas in the comparative example no device as described above was placed.
The following examples 1 and 2 differ in that: the gas intercepting devices 6 are placed at different heights, the gas intercepting devices 6 of the embodiment 1 are placed on the surface layer, the top ends of the gas intercepting devices are 10cm away from the water surface, the gas intercepting devices 6 of the embodiment 2 are placed on the bottom layer, and the bottom ends of the gas intercepting devices are 5cm away from the bottom mud layer 3.
In the following examples and comparative examples, the sewage treatment system was continuously operated for 4 months. During the operation period, the excessive duckweeds are quantitatively collected and salvaged once every 4 days, and the covering density of the duckweeds is kept constant to be 550g wet weight/m after each time of salvage 2 (ii) a Inputting 36L of sewage from the water inlet 4 every day, and automatically discharging water with the same volume from the water outlet 5 to ensure that the liquid level is constant, wherein the corresponding hydraulic retention time is 6 days; collecting and measuring the concentrations of pollutants in the inlet water and the outlet water every 2 days, and calculating the removal rates of TN, ammonia nitrogen, nitrate nitrogen, TP, COD and turbidity of the duckweed treatment system, wherein the concentrations of the pollutants in the inlet water are shown in Table 1.
Table 1 shows the concentrations of inlet and outlet water of TN, ammonia nitrogen, nitrate nitrogen, TP, COD and turbidity of comparative example and example
The determination method and the removal rate calculation method of each pollutant are as follows:
determination of COD in water body- -potassium dichromate method (GB 11914-89);
a method for measuring ammonia nitrogen in water body, namely an ultraviolet spectrophotometry (HJ 535-2009);
determination of nitrate nitrogen in water body-ultraviolet spectrophotometry (HJ/T346-2007);
determination of TN in water-ultraviolet spectrophotometry (GB 11894-89);
determination of TP in water body- -ammonium molybdate spectrophotometry (GB 11893-89);
the turbidity was measured with a WGZ-1A turbidity meter from Shanghai Xinrui instruments & meters Limited;
percent (%) removal of contaminants in wastewater = (contaminant concentration of influent water-contaminant concentration of effluent water)
Degree)/concentration of contaminant of feed water × 100%;
improvement rate (%) of removal of contaminants from wastewater (removal rate of contaminants in example-comparative example)
Medium contaminant removal rate)/the contaminant removal rate in comparative example × 100%;
in the following examples and comparative examples, the dry weight growth rate of duckweed was calculated as follows:
dry weight growth rate (g/m) of duckweed 2 D) = (dry weight of duckweed at sampling-dry weight of duckweed at last sampling)/sampling surface area/sampling period;
in the following examples, CH 4 The collection of the gas was as follows:
(1) Surface gas of the duckweed treatment system: collecting methane gas generated on the surface of the duckweed treatment system once every 10 days, and collecting methane gas by using a static box method, wherein the methane gas collecting device is in a hemispherical shapeThe volume of the acrylic glass static box is 0.028m 3 The total volume of space for gas sampling is 0.046m 3 The cross-sectional area is 0.19m 2 . Tightly sealing the static box at the upper opening of a duckweed pond water treatment system during gas collection, installing a small fan at the top end of the static box, uniformly mixing gas to be collected, arranging a thermometer and a gas sampling hole at the side part of the static box, recording the gas temperature in the static box during air extraction, extracting 300mL of gas in the box by using a medical injector with the specification of 300mL during the process of collecting the methane gas, extracting once every 10 minutes for 3 times, immediately injecting an aluminum foil gas collection bag which is extracted to a vacuum state after the extraction is finished, and then measuring the concentration and the yield of the methane gas.
(2) Underwater gas of the duckweed processing system: methane gas generated underwater is collected by using a drainage gas collection method. The operation process is as follows: firstly, after closing the valve A10 and opening the valve B12 and the valve C15, water is injected into the water injection tank 14 continuously, the injected water enters the gas collecting tank 9 through the water injection pipe 13 until the water level in the gas collecting tank 9 reaches the valve 12, the water injection is stopped, the valve B12 and the valve C15 are closed in sequence, and the valve A10 is opened to finish the water injection. In the sewage treatment process, the bed mud layer 3 and the water body of the duckweed treatment system can generate a large amount of CH-containing substances 4 The gas in the gas collection tank 9 is collected by the gas collection tank 9, the storage bag is connected with the exhaust pipe 11 after the gas collection tank 9 is full of gas, the valve A10 is closed, water is continuously injected into the water injection tank 14 after the valve B12 and the valve C15 are opened, the injected water enters the gas collection tank 9 through the water injection pipe 13, the gas in the gas collection tank 9 is extruded into the storage bag from the exhaust pipe 11 for storage and utilization, the water injection is stopped after the gas in the gas collection tank 9 is completely removed, the valve B12 and the valve C15 are closed in sequence, the valve A10 is opened, the gas collection and water injection work is completed, and the next gas collection work is started. Finally, the methane gas concentration in the storage bag was measured and the yield was calculated.
CH 4 The method for measuring the gas concentration comprises the following steps: measured by gas chromatography (GCAgilent 7890) using a flameFlame Ionization Detector (FID), column temperature 60 deg.C, detector temperature 250 deg.C, and flow rate of carrier gas 30mL/min.
CH 4 Method for calculating gas emission flux:
(1) Duckweed processing system surface CH 4 Calculating gas emission flux: f (mg/m) 2 /h)＝ρ*V/A*P/*P 0 *T 0 /(T 0 + T) Δ C/Δ T, wherein,
F(mg/m 2 h) is CH 4 A discharge flux;
ρ(mol/m 3 ) Is CH 4 Gas density of the gas at standard temperature and pressure;
V(m 3 ) Is the volume of the static tank;
A(m 2 ) Is the cross-sectional area of the static tank;
P 0 (Pa) is a standard atmospheric pressure,
p (Pa) is local air pressure;
T 0 ＝237.15K；
t (DEG C) is the average air temperature in the static tank;
Δ C/Δ T is CH in observation time 4 Slope of the line of change in gas content over time.
(2) Duckweed processing system underwater gas production (collection rate) calculation:
G(mL/m 2 d) = B/S/D, wherein,
G(mL/m 2 d) is the gas yield (collection rate);
b (mL) is CH collected by drainage gas collection method 4 Volume;
S(m 2 ) Is the cross-sectional area of the funnel bottom;
d (D) is the number of days of collection.
The practical effects of the examples and comparative examples are as follows:
comparative example:
as can be seen from FIG. 2, the average dry weight growth rate of duckweed in the comparative duckweed treatment system was 7.35g/m for 4 months during the sewage treatment and duckweed growth process 2 /d。
As can be seen from FIG. 3, comparative duckweed treatment lineThe system can be used for keeping the CH in the 4-month continuous sewage treatment and duckweed growth process in the daytime 4 The discharge flux is 1.07mg/m 2 The discharge flux at night is 2.58mg/m 2 H, all day CH 4 The discharge flux is 1.82mg/m 2 /h。
As can be seen from FIG. 4, the average effluent CH of the duckweed treatment system of the comparative example during system operation 4 The concentration is 4.64ug/L.
As can be seen from the water inlet and outlet concentrations of the pollutants in Table 1, the outlet water concentration in the duckweed treatment system of the comparative example was lower than the inlet water concentration, indicating that the pollutants were removed.
As can be seen from fig. 6, in 4 months of the duration of the sewage treatment and duckweed growth processes of the duckweed treatment system in the comparative example, the removal rate of TN is 36.37%, the removal rate of ammonia nitrogen is 34.83%, the removal rate of nitrate nitrogen is 47.95%, the removal rate of TP is 42.11%, the removal rate of COD is 6.10%, and the removal rate of turbidity is 9.77%.
Example 1:
as can be seen from FIG. 2, the average dry weight growth rate of duckweed in the duckweed treatment system of example 1 was 6.07g/m during 4 months of the duration of the sewage treatment and duckweed growth process 2 And/d, the duckweed continues to grow and a dry matter yield of duckweed can be achieved.
As can be seen from FIG. 3, the duckweed treatment system of example 1 has a 4-month duration of wastewater treatment and duckweed growth, and has a CH during the day 4 The discharge flux is reduced to 0.22mg/m 2 The discharge flux at night is reduced to 0.43mg/m 2 H, all day CH 4 The discharge flux is reduced to 0.32mg/m 2 H, daytime CH compared to comparative example 4 The discharge flux is reduced by 79.59%, the discharge flux at night is reduced by 83.39%, and the whole day CH 4 The discharge flux is reduced by 82.27%, and the duckweed treatment system of example 1 discharges less CH 4 A gas; shows that the arrangement of the gas interception device plays a role in methane emission reduction of the duckweed treatment system and is beneficial to CH 4 The recycling of the gas relieves the greenhouse effect to a certain extent.
As can be seen from FIG. 4, the average effluent CH in the duckweed treatment system of example 1 4 The concentration was 1.54ug/L, and the effluent CH of the duckweed treatment system of example 1 was compared to the comparative example 4 The concentration is reduced by 66.78%, which shows that the gas interception device is favorable for reducing the outlet water CH of the duckweed treatment system 4 The concentration is favorable for relieving the greenhouse effect to a certain extent.
As can be seen from fig. 5, the bottom mud layer CH in the duckweed processing system of example 1 4 The yield (collection rate) was 419.40mL/m 2 D, bottom sediment layer CH 4 The average content is 24.22%, and the fuel can be used as fuel after further concentration and purification.
As can be seen from table 1, the effluent concentration in the duckweed treatment system of example 1 was lower than the feed water concentration, indicating that the contaminants were removed, and the effluent concentration of example 1 was lower than the comparative effluent concentration, indicating that the duckweed treatment system of example 1 removed more contaminants.
As can be seen from fig. 6, in 4 months of the duration of the sewage treatment and duckweed growth processes, the removal rate of TN is 38.14%, the removal rate of ammonia nitrogen is 39.69%, the removal rate of nitrone is 55.08%, the removal rate of TP is 44.50%, the removal rate of COD is 12.62%, and the removal rate of turbidity is 11.53% in the duckweed treatment system of example 1, compared with the comparative example, the removal rates of TN, ammonia nitrogen, nitrone, TP, COD, and turbidity are respectively increased by 2.98%,6.92%,15.72%,4.07%,7.23%, and 3.61%. The removal rate of various pollutants is further improved.
Example 2:
as can be seen from FIG. 2, the average dry weight growth rate of duckweed in the duckweed treatment system of example 2 was 6.32g/m in 4 months during the sewage treatment and duckweed growth process 2 And/d, the duckweed continues to grow and a dry matter yield of duckweed can be achieved.
As can be seen from FIG. 3, the duckweed treatment system of example 2 has a 4-month duration of the wastewater treatment and duckweed growth process, and has a CH during the day 4 The discharge flux is reduced to 0.40mg/m 2 The discharge flux at night is reduced to 0.67mg/m 2 H, all day CH 4 The discharge flux is reduced to 0.53mg/m 2 H, daytime CH compared to comparative example 4 The discharge flux is reduced by 62.58 percent, the discharge flux at night is reduced by 74.06 percent, and the whole day CH 4 Discharge channelThe amount is reduced by 70.70%, and the duckweed treatment system of example 2 discharges less CH 4 A gas; shows that the interception measure of the gas interception device plays a role in methane emission reduction of the duckweed treatment system and is beneficial to CH 4 The recycling of the gas relieves the greenhouse effect to a certain extent.
As can be seen from FIG. 4, the average effluent CH in the duckweed treatment system of example 2 4 The concentration is 1.69ug/L, and compared with the comparative example, the effluent CH of the duckweed treatment system in the example 2 4 The concentration is reduced by 63.66 percent, which shows that the gas interception device is beneficial to reducing the effluent CH of the duckweed treatment system 4 The concentration can relieve the greenhouse effect to a certain extent.
As can be seen from fig. 5, the bottom mud layer CH in the duckweed treatment system of example 2 4 The yield (collection rate) was 298.04mL/m 2 D, bottom sediment layer CH 4 The average content is 29.66%, and the fuel can be used as fuel after further concentration and purification.
As can be seen from table 1, the effluent concentration in the duckweed treatment system of example 2 was lower than the feed water concentration, indicating that the contaminants were removed, and the effluent concentration of example 2 was lower than the comparative effluent concentration, indicating that the duckweed treatment system of example 2 removed more contaminants.
As can be seen from fig. 6, in 4 months of the duration of the sewage treatment and duckweed growth processes of the duckweed treatment system in example 2, the removal rate of TN is 36.86%, the removal rate of ammonia nitrogen is 34.98%, the removal rate of nitrone is 50.49%, the removal rate of TP is 43.01%, the removal rate of COD is 12.29%, and the removal rate of turbidity is 10.47%. The removal rate of various pollutants is further improved.
Combining the data in the examples and comparative examples and the above comparative analysis, it can be seen that the examples allow for the mass production of duckweed biomass with an average dry matter yield of more than 6g/m compared to the comparative examples 2 D; the gas interception device in the embodiment can effectively reduce CH of the duckweed treatment system 4 The discharge flux is reduced by over 70 percent, and meanwhile, the flotation can be effectively reducedCH in duckweed treatment system effluent 4 The concentration and the reduction rate exceed more than 60 percent, and the two aspects greatly relieve the greenhouse effect of a duckweed treatment system; in addition, the method can realize the effective collection of the underwater gas of the duckweed processing system, and the gas collection rate exceeds 298mL/m 2 D, collected gas CH 4 The content is more than 24 percent on average, and the fuel can be used as fuel after further concentration and purification; meanwhile, the method can also effectively improve the removal rate of pollutants (TN, ammonia nitrogen, nitrate nitrogen, TP, COD and turbidity) in the duckweed treatment system. To sum up, the utility model provides a sewage treatment system and method for realizing aquatic plant biomass production and methane collection to solve duckweed treatment system CH 4 The problems of loss and large discharge flux are solved, the energy recovery efficiency of the duckweed treatment system is improved, and the contribution of the duckweed treatment system to the greenhouse effect is reduced. The method has important practical guiding significance for the construction of a clean and efficient duckweed treatment system and the application of the duckweed treatment system in water environment pollution treatment and carbon, nitrogen and phosphorus resource recovery.
The above description is only for the specific embodiment of the present invention, and the common general knowledge of the known specific structure and characteristics of the scheme is not described too much here. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (8)
1. A sewage treatment system for realizing biomass production of aquatic plants and methane collection is characterized in that the sewage treatment system comprises an aquatic plant treatment system body (1), a water inlet (4), a water outlet (5), a gas interception device (6), a gas collection tank (9) and a water injection tank (14);
the aquatic plant treatment system body (1) is arranged into a cavity with an upward opening;
the water inlet pipe and the water outlet pipe are arranged on the side part of the aquatic plant treatment system body (1);
the water inlet (4) of the water inlet pipe is arranged at the lower part of the side wall of the aquatic plant treatment system body (1);
the water outlet (5) of the water outlet pipe is arranged at the upper part of the side wall of the aquatic plant treatment system body (1);
the gas interception device (6) is arranged inside the aquatic plant treatment system body (1);
a gas conduit (8) is arranged between the gas interception device (6) and the gas collection tank (9); a gas gathering point (7) is arranged on the gas interception device (6); one end of the gas conduit (8) is fixedly connected with the gas interception device (6) at the gas collection point (7); the other end of the gas conduit (8) is fixedly connected with the gas collection tank (9) at the bottom of the gas collection tank (9);
an exhaust pipe (11) is arranged at the upper part of the gas collection tank (9);
the water injection tank (14) is arranged on one side of the gas collection tank (9); a water injection pipe (13) is arranged between the gas collecting tank (9) and the water injection tank (14); one end of the water injection pipe (13) is fixedly connected with the bottom of the gas collecting tank (9); the other end of the water injection pipe (13) is fixedly connected with the bottom of the water injection tank (14).
2. A wastewater treatment system for biomass production from aquatic plants and methane collection according to claim 1, wherein said wastewater treatment system comprises a plant growth space (2) and a bottom sludge layer (3);
the plant growth space (2) is arranged at the opening of the aquatic plant treatment system body (1);
the bottom mud layer (3) is arranged at the bottom of the aquatic plant treatment system body (1).
3. A sewage treatment system for biomass production and methane collection from aquatic plants according to claim 2 wherein the water inlet (4) is located above the bottom sludge layer (3) and below the gas intercepting means (6); the gas interception device (6) is arranged between the plant growth space (2) and the bottom mud layer (3).
4. A wastewater treatment system for biomass production and methane collection by aquatic plants according to claim 1, wherein said gas conduit (8) is provided with a valve a (10); a valve B (12) is arranged on the exhaust pipe (11); and a valve C (15) is arranged on the water injection pipe.
5. A wastewater treatment system for realizing biomass production and methane collection by aquatic plants according to claim 1, characterized in that the cross-sectional shape of the gas interception means (6) matches the cross-sectional shape of the inner cavity of the body (1) of the aquatic plant treatment system.
6. A wastewater treatment system for realizing biomass production and methane collection by aquatic plants according to claim 1, characterized in that the bottom end of the water injection tank (14) is higher than the top end of the gas collecting tank (9).
7. A sewage treatment system for realizing biomass production and methane collection by aquatic plants according to claim 2, wherein the bottom end of the gas collecting tank (9) is higher than the aquatic plant growth space (2).
8. A wastewater treatment system for realizing biomass production and methane collection by aquatic plants according to claim 1, characterized in that the water injection tank (14) and the gas collection tank (9) are provided with a bracket (16) at the bottom.
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