CN108751600A - Utilize the sewage disposal system and sewage water treatment method of multiple muskeg group - Google Patents

Abstract

The invention provides a sewage treatment system utilizing multiple wetland vegetation communities, including a pre-wetland pond, a grid well, a regulating pond, an anaerobic pond, an anoxic pond, an aerobic pond, a sedimentation pond, and a first water quality pond connected in sequence. Monitoring well, water inlet pool, spiral wetland pool, outlet pool, and second water quality monitoring well; the spiral wetland pool includes a sightseeing tower, and a spiral pool body is arranged around the sightseeing tower, and different layers of plants are planted in each layer of the pool. The bottom of the pool body is equipped with corresponding biological substrates according to different plants, elevators are installed in the observation tower, and transparent windows are installed on the side walls of the observation tower; Arranged from high to low; anaerobic pools, anoxic pools, aerobic pools, and sedimentation tanks are arranged from high to low. The invention also provides a sewage treatment method utilizing multiple wetland vegetation communities. The invention has the advantages of energy saving, small occupied area, high efficiency, wide application range and landscape value.

Description

Sewage treatment system and sewage treatment method using multiple wetland vegetation communities

technical field

The invention relates to the technical field of water treatment, in particular to a sewage treatment system and a sewage treatment method utilizing multiple wetland vegetation communities.

Background technique

Under the double influence of human activities and climate change, the water quality of my country's coastal areas, rivers and lakes has gradually deteriorated in recent years, accompanied by frequent occurrence of ecological disasters such as red tides, acidification, and bottom hypoxia, which have seriously affected the economic development of my country's coastal zones and people's living standards. Bring immeasurable losses, and threaten the health of the people. In particular, urban domestic sewage, industrial wastewater, and farmland water carrying a large amount of pollutants (such as nitrogen, phosphorus, and heavy metals) are important sources of pollution that lead to water quality deterioration and eutrophication, and their harm has aroused widespread concern among coastal people. At present, many government departments and scientific researchers are also making various attempts and efforts to control the eutrophication of water bodies. While building sewage treatment plants, they have also developed many sewage treatment technologies and methods. Among them, the use of artificial wetlands or natural wetlands for sewage treatment is one of the most popular ones.

Wetlands have a strong self-purification ability and the ability to purify sewage, and are known as the "kidney of the earth". In recent years, wetlands have begun to be used for sewage treatment. Because of their advantages of low cost, green and environmental protection, and can avoid the defects of high cost, high energy consumption, and complicated operation and management of conventional sewage treatment plants, they are gradually becoming an efficient biological The restoration approach has received more and more attention from researchers and government departments. Wetland sewage treatment technology utilizes the synergy of physical, chemical, biological and other multiple processes in multi-sphere ecosystems such as terrestrial vegetation in artificial or natural wetlands, microorganisms in soil, and plankton in water bodies to treat impurities and harmful elements in sewage. For treatment, its mechanism of action includes a series of biological and chemical actions such as retention, filtration, adsorption, redox, precipitation, microbial decomposition, degradation transformation, plant absorption, residue accumulation, etc., and the process is extremely complicated; this technology is like other sewage treatment technologies The combination can enhance the purification ability and decontamination effect. Therefore, wetland sewage treatment technology is often a comprehensive and multivariate systemic technology. At the same time, it is also necessary to adopt specific and targeted design methods and treatment methods according to the source, specific nature and pollution characteristics of sewage.

The current wetland sewage treatment technology mainly has the following problems: (1) The vegetation and biological communities are relatively single, and different vegetation and biological communities in wetlands have different biological characteristics, so the biochemical processes are also different when purifying sewage. It is also diversified. However, in the past, one type of wetland was often used as a wetland pool in previous designs, and the biological community was relatively single, and its purification effect needs to be improved. (2) It occupies a large space. The wetland pool in the sewage treatment system is generally designed according to the characteristics of sewage and pollutants. However, a common defect in previous designs is that it is placed flat on the surface and occupies a large space, which is extremely valuable in land. cities appear to be cost prohibitive. (3) The operating cost is high. In the past, more mechanical equipment was used in the wetland treatment system, which required personnel to operate online for a long time, which increased energy consumption and labor costs. (4) The effect of sewage treatment is not ideal. In sewage treatment, the system of "anaerobic pool - anoxic pool - aerobic pool" is the key process for nitrogen and phosphorus removal. The design of reflux limits the efficiency of the process of "anaerobic tank-anoxic tank-aerobic tank".

Contents of the invention

This patent design aims at the disadvantages of relatively single vegetation, high operating costs and unsatisfactory sewage treatment effect in the existing wetland sewage treatment technology, and provides a new sewage treatment system that combines multiple wetland biological communities and utilizes a three-dimensional spiral design. And sewage treatment methods, while providing energy-saving and efficient sewage treatment services, it has a certain ornamental value.

The present invention is realized by adopting the following technical solutions:

A sewage treatment system utilizing multiple wetland vegetation communities, including sequentially connected pre-wetland ponds, grid wells, regulating ponds, anaerobic ponds, anoxic ponds, aerobic ponds, sedimentation ponds, and the first water quality monitoring well , water inlet pool, spiral wetland pool, water outlet pool, second water quality monitoring well;

The bottom of the pre-wetland pool is provided with a biological substrate on which reeds grow, the water inlet is arranged above the biological substrate, the water outlet is arranged below the biological substrate, the water outlet is connected to the water inlet of the grill well, and the grill well The water outlet of the grid well is connected to the regulating pool at the bottom of the grid well, and the regulating pool is connected to the front end of the anaerobic pool through a water pipe, and a sewage lifting pump is installed on the water pipe; the water outlet of the anaerobic pool is connected to the water inlet of the anoxic pool, The water outlet of the oxygen pool is connected with the water inlet of the aerobic pool, and a mixing return pipe is set between the end of the aerobic pool and the front end of the anoxic pool, and a sewage lifting pump is arranged on the mixing return pipe; the water outlet of the aerobic pool is connected with the sedimentation tank The sedimentation tank is connected to the water inlet pool, and the first quality monitoring well is set between the sedimentation tank and the water inlet pool. The water inlet pool is connected to the water inlet of the spiral wetland pool through a water pipe. The water outlet is connected to the water outlet pool, and a second water quality monitoring well is arranged at the water outlet of the water outlet pool, and the second water quality monitoring well is connected to the water outlet pipe, and a valve is arranged on the water outlet pipe;

The spiral wetland pool includes a sightseeing tower, and a spiral pool body is arranged around the sightseeing tower. Different wetland plants are planted in each layer of the pool body. The bottom of the pool body is provided with corresponding biological substrates according to different plants, and elevators are installed in the sightseeing tower. , transparent windows are set on the side wall of the sightseeing tower;

The pre-wetland pools, grid wells, and regulating pools are arranged from high to low; anaerobic pools, anoxic pools, aerobic pools, and sedimentation pools are arranged from high to low.

Further, the spiral wetland pool is provided with three layers of pools, the upper pool is planted with calamus, the middle pool is planted with Zaili flowers, and the lower pool is planted with lotus roots.

The present invention also provides a sewage treatment method utilizing multiple wetland vegetation communities, comprising the following steps:

(1) Introduce sewage into the pre-wetland pool, plant reeds in the pre-wetland pool, fill the bottom with biological matrix materials, and the sewage flows through the roots of the reeds and the surface of the matrix, and then automatically flows into the grid well;

(2) A grid is arranged in the grid well to trap larger suspended solids or particles in the water body, and the sewage will automatically flow into the regulating tank from the outlet pipe at the bottom of the grid, and the water in the regulating tank will flow into the anaerobic through the sewage lifting pump. pool;

(3) In the anaerobic tank, the refractory high-molecular organic matter in the sewage is transformed into a low-molecular organic matter that is easily degraded;

(4) The sewage enters the anoxic pool automatically from the bottom of the anaerobic pool, and the sewage is denitrified in the anoxic pool;

(5) The sewage enters the aerobic pool automatically from the bottom of the anoxic pool, and the organic matter in the sewage is further decomposed into inorganic matter; the sewage at the end of the aerobic pool is returned to the front end of the anoxic pool through the sewage lifting pump;

(6) Sewage from the aerobic tank automatically enters the sedimentation tank for preliminary precipitation, and some mineralized substances or sludge or particles that cannot undergo biochemical reactions are precipitated;

(7) After being tested by the first water quality monitoring well, the settled sewage flows into the water inlet pool. The water in the water inlet pool enters the spiral wetland pool through the sewage lifting pump, and after multiple filtration and biochemical treatment from top to bottom, it automatically flows into the pool. The outlet pool flows out after passing the test of the second water quality monitoring well.

Further, the dissolved oxygen content in the anaerobic pool is controlled below 0.2mg/L, the dissolved oxygen content in the anoxic pool is controlled at 0.4mg/L-0.6mg/L, and the dissolved oxygen in the aerobic pool The content is controlled at 2mg/L-5mg/L.

The sewage treatment system and method provided by the invention have the following beneficial effects:

(1) The vegetation is diversified and used in combination, which has a better purification effect on sewage; it is also ornamental and can be used as a landscape;

(2) Three-dimensional spiral design and stepped design, which use natural gravity to push water flow, reduce the use of mechanical equipment and on-site operators, and achieve the effect of saving energy, reducing consumption and reducing operating costs;

(3) A reed wetland pool is added in front of the grid well to effectively slow down the water flow velocity. At the same time, the filter function and mechanical blocking effect of the reed itself are used to block the large sewage impurities outside the grid well and reduce the water flow rate of the grid well. pressure.

(5) The mixed liquid reflux design of "the end of the aerobic pool → the front end of the anoxic pool" can achieve better nitrogen and phosphorus removal effects.

(6) Water quality monitoring wells are added at the front and back ends of the spiral wetland pool, and the automatic water quality detector is used to detect the effect of sewage treatment on-line to ensure that the sewage treatment results meet the discharge standards.

The present invention makes full use of multiple physical, chemical, biological and other multiple process synergies in multiple terrestrial vegetation in multiple artificial/natural wetlands, multiple microorganisms in the soil, and plankton in the water body, etc., to treat impurities and harmful elements in sewage to process. It has many advantages such as simple structure, clever use of gravity to save energy, small footprint, high efficiency, wide application range, landscape value, etc., and has a long service life, and has safe and reliable performance and service functions.

Description of drawings

Fig. 1 is the structural representation of the sewage treatment system of embodiment 1.

In the figure: 1. Front wetland pool; 2. Grid well; 3. Regulating pool; 4. Anaerobic pool; 5. Anoxic pool; 6. Aerobic pool; 7. Sedimentation pool; 8. First water quality Monitoring well; 9. Inlet pool; 10. Spiral wetland pool; 11. Outlet pool; 12. Second water quality monitoring well; 13. Mixed return pipe; 14. Sightseeing tower; 15. Pool body; 16. Valve ; 17. Biological matrix; 18. Reed.

Detailed ways

In order to understand the above-mentioned purpose, features and advantages of the present invention more clearly, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

Example 1

This embodiment provides a sewage treatment system using multiple wetland vegetation communities, as shown in Figure 1, including a pre-wetland pool 1, a grid well 2, a regulating pool 3, an anaerobic pool 4, and anoxic pool 5 connected in sequence , an aerobic pool 6, a sedimentation pool 7, a first water quality monitoring well 8, an inlet pool 9, a spiral wetland pool 10, an outlet pool 11, and a second water quality monitoring well 12. The arrows in the figure indicate the direction of water flow.

Pre-wetland pool 1, grid well 2, and regulating pool 3 are arranged from high to low; anaerobic pool 4, anoxic pool 5, aerobic pool 6, and sedimentation pool 7 are also arranged from high to low. This stepped design makes each unit have a certain height difference, and gravity can be used to promote the automatic flow of water, thereby reducing the frequency of use of the sewage lift pump and reducing energy consumption.

The bottom of the pre-wetland pool 1 is provided with a biological matrix 17. The biological matrix 17 can satisfy the basic growth of reeds, but the content of nitrogen and phosphorus is not rich. Reeds 18 grow on the biological matrix. The water inlet is set above the biological matrix 17, and the water outlet is set at Below the biological matrix 17 , the water outlet is connected with the water inlet of the grid well 2 . The reed wetland pool 1 is set in front of the grid well 2, which can effectively slow down the water flow speed, and at the same time, use the filtering function and mechanical blocking function of the reed itself to block the larger sewage impurities, such as foam plastic bags and larger suspended solids. outside the grill well, thereby relieving the pressure on the grill well.

The water outlet of the grid well 2 is set at the bottom of the grid well 2 and is connected with the adjustment tank 3. The adjustment tank 3 is connected with the front end of the anaerobic tank 4 through a water pipe, and a sewage lifting pump is installed on the water pipe to lift the sewage to the anaerobic tank 4. The water outlet of the anaerobic pool 4 is connected with the water inlet of the anoxic pool 5, the water outlet of the anoxic pool 5 is connected with the water inlet of the aerobic pool 6, and the end of the aerobic pool 6 and the front end of the anoxic pool 5 are arranged Mixing return pipe 13, a sewage lifting pump is arranged on the mixing return pipe 13. The mixed liquid reflux design of "the end of the aerobic pool → the front end of the anoxic pool" can achieve better nitrogen and phosphorus removal effects.

The water outlet of the aerobic tank 6 is connected to the sedimentation tank 7, and the sedimentation tank 7 is connected to the outlet tank 9. The first water quality monitoring well 8 is set between the sedimentation tank 7 and the outlet tank 9, and a detector is arranged in the water quality monitoring well. The water of the sewage enters the effluent 9 pools through the sewage lift pump. The water outlet pool 9 is connected to the water inlet of the spiral wetland pool 10 through a water pipe, and a second water quality monitoring well 11 is arranged at the water outlet of the spiral wetland pool 8, and the outlet pipe connected to the second water quality monitoring well 11 is connected to the outlet pipe Set valve 16 on. Water quality monitoring wells are added at the front and back ends of the spiral wetland pool, and automatic water quality monitors are used to monitor the sewage treatment status online, so as to adjust the water flow rate and vegetation types according to the water quality conditions, so that the sewage treatment effect can be guaranteed.

The spiral wetland pool 10 includes a sightseeing tower 14, and a spiral pool body 15 is arranged on the periphery of the sightseeing tower 14. Iris is planted in the upper pool body, Zailihua is planted in the middle pool body, lotus roots are planted in the lower pool body, and the bottom of each layer of pool body is according to Different setups of plants correspond to biosubstrates. Sightseeing elevator is set in sightseeing tower 14, and transparent window is set on the side wall of sightseeing tower.

The three-dimensional spiral design allows the water body to flow naturally, reducing energy consumption; the multi-layer structure occupies a small area; the multiple vegetation not only has better purification effect, but also has great ornamental value, which can be set up as a landmark building or a viewing spot.

Utilize the well-developed root system of the vegetation in the upper pool and the microorganisms proliferating in large quantities in the rhizosphere to quickly degrade the organic matter in the sewage and purify the sewage; the oxygen produced by the vegetation in the middle pool diffuses into the water, forming many anoxic areas at the bottom of the water body and aerobic zone. In the aerobic zone, through the action of aerobic microorganisms attached to the root system, the organic matter in the sewage is decomposed, and part of the mineralized inorganic matter (such as nitrogen and phosphorus) can be used by plants; Nitrification and denitrification can purify the sewage; the lower pool further purifies the sewage. After the above three purifications, the sewage treatment effect is more ideal.

The level of the spiral wetland pool is related to the pollution of the water body and can be adjusted flexibly, not limited to the three levels mentioned above. If the content of harmful pollution elements such as nitrogen, phosphorus, organic matter, and heavy metals is still high after the previous "anaerobic pool-anoxic pool-aerobic pool" treatment, the number of layers of the pool body can be increased.

Sewage is filtered and biochemically reacted by wetland vegetation and matrix microbial communities to remove excess nitrogen, phosphorus, silicon, and heavy metals in the sewage; the sewage from it will be collected in the effluent pool, and then pass through the water quality monitoring well and pass through the water quality control system. The detector performs real-time online water quality sampling and monitoring, checks the effect of sewage treatment, and finally saves it to the outlet valve.

Example 2

This embodiment provides a sewage treatment method using multiple wetland vegetation communities, including the following steps:

(1) Introduce sewage into the pre-wetland pool, plant reeds in the pre-wetland pool, fill the bottom with biological matrix materials, and the sewage flows through the roots of the reeds and the surface of the matrix, and then automatically flows into the grid well;

(2) A grid is arranged in the grid well to trap larger suspended solids or particles in the water body, and the sewage will automatically flow into the regulating tank from the outlet pipe at the bottom of the grid, and the water in the regulating tank will flow into the anaerobic through the sewage lifting pump. pool;

(3) The content of dissolved oxygen in the anaerobic tank is controlled at about 0.1mg/L. In the anaerobic tank, the refractory high-molecular organic matter in the sewage is transformed into a low-molecular organic matter that is easily degraded;

(4) Sewage enters the anoxic pool automatically from the bottom of the anoxic pool, and the content of dissolved oxygen in the anoxic pool is controlled at 0.5mg/L, and the sewage denitrifies in the anoxic pool;

(5) The sewage enters the aerobic pool automatically from the bottom of the anoxic pool. The dissolved oxygen content in the aerobic pool is controlled at 4mg/L, and the organic matter in the sewage is further decomposed into inorganic matter; the sewage at the end of the aerobic pool passes through The sewage lifting pump returns to the front end of the anoxic pool;

(6) Sewage from the aerobic tank automatically enters the sedimentation tank for preliminary precipitation, and some mineralized substances or sludge or particles that cannot undergo biochemical reactions are precipitated;

(7) After being tested by the first water quality monitoring well, the settled sewage flows into the inlet pool, and the water in the inlet pool enters the spiral wetland pool through the sewage lifting pump, and flows through the upper pool body and the middle pool body in sequence from top to bottom and the lower pool body, the calamus in the upper pool body quickly degrades the organic matter in the sewage; the oxygen produced by Zailihua in the middle pool body diffuses into the water, forming many anoxic and aerobic areas at the bottom of the water body; the lower pool body further The sewage can be purified. After the above triple purification, the sewage treatment effect is more ideal. After multiple filtration and biochemical treatment, the water automatically flows into the outlet pool, and flows out after being tested by the water quality detector.

The above-mentioned embodiments are only descriptions of preferred implementations of the present invention, and are not intended to limit the scope of the present invention. Variations and improvements should fall within the scope of protection defined by the claims of the present invention.

Claims (4)

1. A sewage treatment system utilizing multiple wetland vegetation communities is characterized in that it comprises successively connected pre-wetland ponds, grid wells, regulating ponds, anaerobic ponds, anoxic ponds, aerobic ponds, sedimentation ponds, the first A water quality monitoring well, an inlet pool, a spiral wetland pool, an outlet pool, and a second water quality monitoring well; The bottom of the pre-wetland pool is provided with a biological substrate on which reeds grow, the water inlet is arranged above the biological substrate, the water outlet is arranged below the biological substrate, the water outlet is connected to the water inlet of the grill well, and the grill well The water outlet of the grid well is connected to the regulating pool at the bottom of the grid well, and the regulating pool is connected to the front end of the anaerobic pool through a water pipe, and a sewage lifting pump is installed on the water pipe; the water outlet of the anaerobic pool is connected to the water inlet of the anoxic pool, The water outlet of the oxygen pool is connected with the water inlet of the aerobic pool, and a mixing return pipe is set between the end of the aerobic pool and the front end of the anoxic pool, and a sewage lifting pump is arranged on the mixing return pipe; the water outlet of the aerobic pool is connected with the sedimentation tank The sedimentation tank is connected to the water inlet pool, and the first quality monitoring well is set between the sedimentation tank and the water inlet pool. The water inlet pool is connected to the water inlet of the spiral wetland pool through a water pipe. The water outlet is connected to the water outlet pool, and a second water quality monitoring well is arranged at the water outlet of the water outlet pool, and the second water quality monitoring well is connected to the water outlet pipe, and a valve is arranged on the water outlet pipe; The spiral wetland pool includes a sightseeing tower, and a spiral pool body is arranged around the sightseeing tower. Different wetland plants are planted in each layer of the pool body. The bottom of the pool body is provided with corresponding biological substrates according to different plants, and elevators are installed in the sightseeing tower. , transparent windows are set on the side wall of the sightseeing tower; The pre-wetland pools, grid wells, and regulating pools are arranged from high to low; anaerobic pools, anoxic pools, aerobic pools, and sedimentation pools are arranged from high to low. 2. The purification system according to claim 1, wherein the spiral wetland pool is provided with three layers of pool bodies, and the vegetation planted sequentially from top to bottom are calamus, relihua, and lotus root. 3. A sewage treatment method utilizing multiple wetland vegetation communities, characterized in that, comprising the following steps: (1) Introduce sewage into the pre-wetland pool, plant reeds in the pre-wetland pool, fill the bottom with biological matrix materials, and the sewage flows through the roots of the reeds and the surface of the matrix, and then automatically flows into the grid well; (2) A grid is arranged in the grid well to trap larger suspended solids or particles in the water body, and the sewage will automatically flow into the regulating tank from the outlet pipe at the bottom of the grid, and the water in the regulating tank will flow into the anaerobic through the sewage lifting pump. pool; (3) In the anaerobic tank, the refractory high-molecular organic matter in the sewage is transformed into a low-molecular organic matter that is easily degraded; (4) The sewage enters the anoxic pool automatically from the bottom of the anaerobic pool, and the sewage is denitrified in the anoxic pool; (5) The sewage enters the aerobic pool automatically from the bottom of the anoxic pool, and the organic matter in the sewage is further decomposed into inorganic matter; the sewage at the end of the aerobic pool is returned to the front end of the anoxic pool through the sewage lifting pump; (6) Sewage from the aerobic tank automatically enters the sedimentation tank for preliminary precipitation, and some mineralized substances or sludge or particles that cannot undergo biochemical reactions are precipitated; (7) After being tested by the first water quality monitoring well, the settled sewage flows into the water inlet pool. The water in the water inlet pool enters the spiral wetland pool through the sewage lifting pump, and after multiple filtration and biochemical treatment from top to bottom, it automatically flows into the pool. The outlet pool flows out after passing the test of the second water quality monitoring well. 4. sewage treatment method according to claim 3 is characterized in that, the content of the dissolved oxygen in the described anaerobic tank is controlled below 0.2mg/L, and the content of the dissolved oxygen in the anoxic tank is controlled at 0.4mg/L L-0.6mg/L, the content of dissolved oxygen in the aerobic pool is controlled at 2mg/L-5mg/L.