CN110589972A - Submerged plant surface flow artificial wetland treatment system and method for treating tail water by using same - Google Patents
Submerged plant surface flow artificial wetland treatment system and method for treating tail water by using same Download PDFInfo
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- CN110589972A CN110589972A CN201910759964.7A CN201910759964A CN110589972A CN 110589972 A CN110589972 A CN 110589972A CN 201910759964 A CN201910759964 A CN 201910759964A CN 110589972 A CN110589972 A CN 110589972A
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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
- C02F3/327—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae characterised by animals and plants
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a submerged plant surface flow artificial wetland treatment system and a method for treating tail water thereof, wherein the submerged plant surface flow artificial wetland treatment system comprises at least two stages of surface flow artificial wetlands which are connected in series, are provided with matrixes inside and are planted with submerged plants; the water level of the surface flow artificial wetland positioned at the upstream is higher than that of the surface flow artificial wetland positioned at the downstream along the water flow direction; and the surface flow artificial wetland is internally provided with a baffle plate for prolonging the hydraulic retention time. The system for treating the surface flow artificial wetland of the submerged plant can ensure that the wetland pushes flow uniformly, short flow is not easy to form, and the effluent effect is ensured; the operation can be realized under the action of gravity, and the operation cost is low; the selected submerged plants have strong tolerance and reproductive capacity, and the influence of the plants on the system is greatly enhanced; the addition of aquatic organisms such as fishes and shrimps can increase the stability and the ornamental value of the treatment system, and the treatment system is high in application value and suitable for wide popularization.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a submerged plant surface flow artificial wetland treatment system and a method for treating tail water by using the same.
Background
The current water pollution problem in China is increasingly serious, drinking water sources are seriously threatened, and how to purify sewage and improve the utilization rate of water resources is urgent. Even if the effluent of the sewage treatment plant meets the first-class A standard of pollutant discharge Standard of urban Sewage treatment plant (GB 18918-2002), certain pollution load and ecological toxicity can be still caused to natural water bodies after tail water is directly discharged. And the water resource is a resource which is in short supply in China, and the urban sewage can be reused in agriculture, industry, municipal water, landscape entertainment, surface water supplementation and groundwater recharge, sequential use of industrial water, cyclic reuse and other fields after being treated and purified. Therefore, further treatment of the effluent of a sewage treatment plant is necessary.
At present, the effluent of a sewage plant is treated by a three-stage treatment process of a biological/chemical method, and although partial nitrogen and phosphorus can be removed, the problems of high investment and operation cost and poor purification effect exist. As a typical ecological treatment technology, the artificial wetland is widely applied to the fields of water quality purification and restoration of polluted water, non-point source pollution control, rainwater treatment and utilization, sewage treatment and the like, has the advantages of low investment and maintenance cost, good effluent quality, small secondary pollution and the like, and is one of effective processes for reducing nitrogen and phosphorus pollutants in secondary effluent.
The surface flow wetland is widely applied to water pollution treatment due to the characteristics of low investment, simple operation and the like, but the surface flow wetland has complex water flow condition, and is easy to form short flow in actual operation to influence the water quality treatment effect, for example, Chinese patent 201320605825.7 discloses a three-level surface flow artificial wetland, which is easy to form short flow and has poor treatment effect. The problem to be solved urgently is to ensure the uniform plug flow of the wetland and the water outlet effect.
Disclosure of Invention
The invention provides a submerged plant surface flow constructed wetland treatment system for overcoming the defects that the surface flow constructed wetland in the prior art is easy to form short flow and influences the water quality treatment effect, and the submerged plant surface flow constructed wetland treatment system can ensure the uniform plug flow of the wetland and ensure the water outlet effect.
The invention also aims to provide a method for treating tail water by using the system for treating the surface flow artificial wetland of the submerged plant.
In order to solve the technical problems, the invention adopts the technical scheme that:
a submerged plant surface flow artificial wetland treatment system comprises at least two stages of surface flow artificial wetlands which are connected in series, provided with substrates and planted with submerged plants; the water level of the surface flow artificial wetland positioned at the upstream is higher than that of the surface flow artificial wetland positioned at the downstream along the water flow direction;
and the surface flow artificial wetland is internally provided with a baffle plate for prolonging the hydraulic retention time.
The baffle plate is added in the surface flow artificial wetland, so that the complex water flow condition in a surface flow artificial wetland system is improved, the uniform plug flow in the wetland is ensured, the sufficient contact oxidation environment and degradation time of sewage are ensured, the baffle plate ensures that short flow is not easily formed in the system, and the effluent quality is improved. The system is provided with at least two stages of surface flow artificial wetland systems in series connection, so that the stability of the system for degrading pollutants is improved, the removal efficiency of the pollutants is improved, and the water outlet effect is ensured. The height difference is set between the multi-stage surface flow constructed wetlands, a low-energy-consumption ecological system is formed through the action of gravity, and the operation cost is reduced.
Preferably, fish and/or shrimp are raised in the surface flow artificial wetland.
The surface flow constructed wetland is used for breeding fish and shrimp aquatic organisms, and the activity of the aquatic organisms can promote the development of roots of aquatic plants and increase the biomass, so that the dissolved oxygen in the wetland system is indirectly improved. The fish and shrimp organisms feed on humus, algae and plankton in the wetland, so that the water quality is improved, and the ornamental value of the system can be enhanced.
Preferably, the baffle plate forms an S-shaped flow channel in the surface flow constructed wetland.
Preferably, the submerged plant is tape grass.
The evergreen tape grass with strong tolerance, strong reproductive capacity and large biomass is planted in the surface flow constructed wetland, is an evergreen submerged plant in south China, reduces the influence of seasons on a wetland system, and enhances the influence of the plant to the greatest extent. The planting density of the tape grass can be 180 plants/m2。
Preferably, the matrix is red soil. The thickness of the substrate may be 5 cm.
Preferably, the fish is goldfish. The goldfish is easy to feed, has beautiful shape, can beautify the environment, is an ornamental fish which is popular with people, and is a omnivorous fish which is completely domesticated by human beings.
Preferably, the shrimp is a freshwater shrimp. The freshwater shrimps are widely distributed in rivers, lakes, reservoirs and ponds in China, and have the characteristics of strong fertility, strong adaptability, wide eating habits and the like.
The size of the surface flow constructed wetland can be 1.3m multiplied by 3.0m multiplied by 0.7 m.
The invention also provides a method for treating tail water by using the submerged plant surface flow artificial wetland treatment system, which comprises the step of introducing the tail water into the submerged plant surface flow artificial wetland treatment system, wherein the hydraulic retention time is 1.5 d.
Compared with the prior art, the invention has the beneficial effects that:
the system for treating the surface flow artificial wetland of the submerged plant can ensure that the wetland pushes flow uniformly, short flow is not easy to form, the hydraulic retention time of the system is prolonged, the sewage is ensured to be in full contact with an oxidation environment, the removal effect of the system on organic matters and ammonia nitrogen is greatly improved, and the effluent effect is ensured. The treatment system can operate under the action of gravity, and the operation cost is low.
Moreover, the selected submerged plants have strong tolerance, strong reproductive capacity and large biomass, greatly enhances the influence of the plants on the system and reduces the seasonal influence.
In addition, the addition of aquatic organisms such as fishes and shrimps can increase the stability and the ornamental value of the treatment system and improve the removal effect of the system on pollutants.
The system for treating the surface flow artificial wetland of the submerged plant has stronger treatment capacity on tail water of a sewage plant, has stable treatment effect, lower cost and very high application value and ornamental value, and is a low-concentration sewage treatment system and a method which can be widely popularized.
Drawings
FIG. 1 is a schematic view of the surface flow constructed wetland treatment system for submerged plants of examples 1-2 and comparative example 1. In FIG. 1, firstly is a water storage tank; the second is a common type first grade, and the third is a common type second grade; fourthly, a baffling type first level, and fifthly, a baffling type second level; sixthly, the first stage is ecological, and the second stage is ecological.
FIG. 2 is a schematic sectional view of the system for treating a surface flow constructed wetland of submerged plants in examples 1 to 2 and comparative example 1.
FIG. 3 shows NH in tail water by the system for treating the surface flow constructed wetland of the submerged plants in examples 1-2 and comparative example 14+-removal effect of N.
FIG. 4 shows the effect of the constructed wetland treatment system for submerged plant surface flow on the removal of TN in tail water in examples 1-2 and comparative example 1.
FIG. 5 shows the effect of the constructed wetland treatment system for surface flow of submerged plants of examples 1-2 and comparative example 1 on removing TP in tail water.
FIG. 6 shows the effect of the constructed wetland treatment system for surface flow of submerged plants of examples 1 to 2 and comparative example 1 on removal of COD in tail water.
FIG. 7 shows the effect of the constructed wetland treatment system for surface flow of submerged plants of examples 1-2 and comparative example 1 on the removal of SS from tail water.
In the figure, 1, a substrate, 2, submerged plants, 3, a baffle plate, 4 and aquatic organisms such as fishes and shrimps.
Detailed Description
The present invention will be further described with reference to the following embodiments.
The raw materials in the examples are all commercially available;
reagents, methods and apparatus used in the present invention are conventional in the art unless otherwise indicated.
Experiments are carried out on agricultural ecological and rural environment key laboratory test farms of southern agricultural university in Guangzhou, China, and three sets of two-stage submerged plant surface flow artificial wetland treatment systems are set up, namely a two-stage common type submerged plant surface flow artificial wetland treatment system, a two-stage deflection type submerged plant surface flow artificial wetland treatment system and a two-stage ecological type submerged plant surface flow artificial wetland treatment system, namely the submerged plant surface flow artificial wetland treatment systems of the comparative example 1, the embodiment 1 and the embodiment 2.
Example 1
A submerged plant surface flow artificial wetland treatment system comprises two stages of submerged plant surface flow artificial wetlands connected in series, wherein a substrate 1 is arranged in each submerged plant surface flow artificial wetland, submerged plants 2 are planted in the substrate 1, and baffle plates 3 are arranged in each submerged plant surface flow artificial wetland, as shown in figure 1.
Specifically, in the embodiment, the submerged plant surface flow constructed wetland adopts two reinforced concrete cement ponds with the length, width and height of 1.3m, 3.0m, 0.7m, which are connected in series, namely divided into an upper stage and a lower stage; PVC pipes are connected in series up and down, the water depth is 0.4m, 5cm of red soil matrix is paved at the bottom of the pool, submerged plants (evergreen tape grass) are planted on the matrix, and the planting density is 180 plants/m2.4 baffles are installed in the horizontal direction. And (5) obtaining the baffling type submerged plant surface flow artificial wetland treatment system.
Example 2
The submerged plant surface flow constructed wetland treatment system of the embodiment is based on the embodiment 1, and fish and shrimp aquatic organisms 4, specifically goldfishes and freshwater shrimps, are cultured in a stocking mode after growing of the eel for one month to form a composite ecological surface flow constructed wetland system, wherein the culture density is 10 strips/pond of goldfishes, and 60 tails/pond of the freshwater shrimps. And obtaining the ecological type submerged plant surface flow artificial wetland treatment system.
Comparative example 1
The system for treating the surface flow constructed wetland of the submerged plant in the comparative example is different from that in the example 1 in that no baffle plate is arranged, and other parts and connection relations are the same as those in the example 1. And obtaining the common type submerged plant surface flow artificial wetland treatment system.
Running test
The quality of the inlet water is configured according to the first class A standard (GB 18918-.
The three systems are formally operated after being operated for one month in a trial mode, intermittent irrigation is adopted, the continuous irrigation is carried out for 8 hours every day, the amount of treated tail water is 500L/d every day, and the hydraulic retention time is 1.5 d. Sampling frequency is 1 time per week, taking sewage and effluent for water quality analysis, taking the matrix once every month, and measuring indexes such as water content, ammonium nitrogen, nitrate nitrogen, total phosphorus and organic matters. The number and the size of the fishes and the shrimps are counted before and after the experiment, the growth conditions of the fishes and the shrimps are observed every day, and the dead fishes and the shrimps are fished away in time.
The removal effect of the three systems on pollutants is as follows:
in the comparative test of the treatment effect of the three surface flow constructed wetland systems on the tail water of the sewage plant, the evergreen tape grass in the three systems grows well and the biomass is obviously increased, wherein the common type in the comparative example 1 grows relatively well. The ecotype internal stocking goldfish and freshwater shrimps in the embodiment 2 can adapt to tail water, the survival rate of goldfish reaches 100%, the survival rate of freshwater shrimps in the first-stage system is 68.3%, and the survival rate of freshwater shrimps in the second-stage system is 90%. The three sets of surface flow constructed wetlands have good purification effect on tail water of a sewage plant, and the common type of the comparative example 1 is used for COD, TN and NH4+The average removal rates of-N, TP and SS are 83.87%, 59.79%, 86.13%, 86.81% and 72.86% respectively, the removal rates of the baffled type in example 1 for various pollutants are 82.61%, 66.09%, 89.96%, 85.57% and 80.03% respectively, the removal rates of the ecotype in example 2 for various pollutants are 74.55%, 69.87%, 89.53%, 82.04% and 66.59% respectively, the effluent COD and TP reach the surface water environmental quality standard class III or above, and NH4+N reaches above IV types of surface water environmental quality standards. The three sets of artificial wetlands all reduce TN and NH in the bottom mud4+Content of-N, increasing NO in the bottom sludge3N content, which has little effect on TP and organic matter content in the bottom sludge.
Multiple comparative analyses showed no significant difference in COD removal for the three systems, the ecotype of example 2 for TN and TNNO3The effect of removing- -N is good, and the baffling type of example 1 is good for NH4+The removal effect of-N was better, and the removal effect of TP was better in the ordinary type of comparative example 1.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The submerged plant surface flow artificial wetland treatment system is characterized by comprising at least two stages of surface flow artificial wetlands which are connected in series, are internally provided with a matrix (1) and are planted with submerged plants (2); the water level of the surface flow artificial wetland positioned at the upstream is higher than that of the surface flow artificial wetland positioned at the downstream along the water flow direction;
and the surface flow artificial wetland is internally provided with a baffle plate (3) for prolonging the hydraulic retention time.
2. The submerged plant surface flow constructed wetland treatment system of claim 1, wherein fish and/or shrimp are placed in the surface flow constructed wetland.
3. The submerged plant surface flow constructed wetland treatment system according to claim 1, characterized in that the baffle plates (3) form S-shaped flow channels in the surface flow constructed wetland.
4. The submerged plant surface flow constructed wetland treatment system of claim 1, characterized in that the submerged plant (2) is tape grass.
5. The submerged plant surface flow constructed wetland treatment system according to claim 1, characterized in that the substrate (1) is red soil.
6. The submerged plant surface flow constructed wetland treatment system of claim 2, wherein the fish is a goldfish.
7. The submerged plant surface flow constructed wetland treatment system of claim 2, wherein the shrimp is freshwater shrimp.
8. The method for treating the tail water by using the submerged plant surface flow artificial wetland treatment system as claimed in any one of claims 1 to 7, wherein the tail water is introduced into the submerged plant surface flow artificial wetland treatment system, and the hydraulic retention time is 1.5 d.
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| CN201910759964.7A CN110589972A (en) | 2019-08-16 | 2019-08-16 | Submerged plant surface flow artificial wetland treatment system and method for treating tail water by using same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062284A (en) * | 2020-09-09 | 2020-12-11 | 西南大学 | Sewage plant tail water treatment system |
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| CN101786729A (en) * | 2010-03-23 | 2010-07-28 | 南昌大学 | Water distribution-water fall reoxygenation system of surface flow artificial wetland |
| CN103880257A (en) * | 2014-04-14 | 2014-06-25 | 中国科学院亚热带农业生态研究所 | Ecological combined treatment method and device for rural distributed sewage |
| CN106745761A (en) * | 2016-11-28 | 2017-05-31 | 四川君和环保股份有限公司 | Process the improved surface artificial wetland of agricultural surface runoff pollutant |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101786729A (en) * | 2010-03-23 | 2010-07-28 | 南昌大学 | Water distribution-water fall reoxygenation system of surface flow artificial wetland |
| CN103880257A (en) * | 2014-04-14 | 2014-06-25 | 中国科学院亚热带农业生态研究所 | Ecological combined treatment method and device for rural distributed sewage |
| CN106745761A (en) * | 2016-11-28 | 2017-05-31 | 四川君和环保股份有限公司 | Process the improved surface artificial wetland of agricultural surface runoff pollutant |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112062284A (en) * | 2020-09-09 | 2020-12-11 | 西南大学 | Sewage plant tail water treatment system |
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Application publication date: 20191220 |