In-situ enhanced denitrification and phosphorus removal system for polluted water bodies in rivers and lakes and its implementation method

Abstract

The present invention relates to the technical field of river and lake pollution control and water quality improvement, and more particularly to an in-situ enhanced denitrification and phosphorus removal system and implementation method for polluted river and lake water. The system comprises a prefabricated pump station, a regulating pond, and a composite biological reaction zone. The flotation zone has a sludge acidification and reduction zone at the bottom, a clear water channel, an equipment area, and a denitrification and phosphorus removal ecological dam. A landscape waterway is located on one side of the denitrification and phosphorus removal ecological dam. The system pumps polluted river and lake water to the composite biological reaction zone and flotation zone for denitrification and phosphorus removal. The effluent is then discharged downstream through a landscape waterway, thereby ensuring the quality of the replenishment water for the treated water body. The composite biological reaction zone and flotation process are effective methods for removing sludge (SS), degrading organic matter (BOD), and removing nitrogen and phosphorus. Furthermore, the effluent passes through the gravel-paved landscape waterway, significantly improving the dissolved oxygen content and other effluent quality indicators in the replenishment water.

Description

Technical Field

[0001] The present invention relates to the technical field of river and lake pollution control and water quality improvement, and specifically to an in-situ enhanced denitrification and phosphorus removal system and implementation method for polluted water bodies in rivers and lakes. Background Art

[0002] River-type water sources can be categorized as large and medium-sized rivers and small mountain streams based on the size of the source water body, the degree to which water volume is influenced by hydrological and meteorological conditions, seasonal variations, and the impact of regional water environmental quality. Rivers generally have large flow rates and are significantly affected by seasons and precipitation. Water quality fluctuates significantly with seasonality, high turbidity and bacterial loads, and is susceptible to contamination from industrial and domestic wastewater. Domestic and agricultural non-point source wastewater, which contains large amounts of nitrogen, phosphorus, and potassium, degrades organic matter in the water, releasing nutrients. This promotes algae growth and excessive plant growth, resulting in poor aeration, a decrease in dissolved oxygen, and even the formation of an oxygen-free zone. This leads to the death of large numbers of aquatic plants, a blackening of the water surface, and a foul smell, creating "dead rivers" and "dead lakes." Eutrophic water is odorous, dark in color, and harbors high levels of bacteria. Such water is of poor quality and cannot be directly used, leading to the death of large numbers of fish.

[0003] After searching, Chinese patent number CN108128928A discloses an in-situ treatment device for landscape water with enhanced denitrification and phosphorus removal efficiency, including a load-bearing floating platform, a landscape water lifting device arranged on the load-bearing floating platform, and a reaction device for treating the lifted landscape water. The reaction device is a tank body, and a filter screen, a supporting layer, a reaction layer and a filter layer are arranged from bottom to top in the tank body. A water outlet nozzle is arranged above the filter layer. The lifted landscape water flows through the filter screen, the supporting layer, the reaction layer and the filter layer in sequence, and is sprayed out of the tank body by the water outlet nozzle, wherein the reaction layer is filled with a granular composite adsorbent; the present invention also provides an in-situ treatment process for landscape water with enhanced denitrification and phosphorus removal efficiency, which can realize deep treatment of nitrogen and phosphorus pollutants in landscape water bodies.

[0004] The patented product mentioned above provides an in-situ treatment process for landscape water with enhanced denitrification and phosphorus removal efficiency, which can achieve in-depth treatment of nitrogen and phosphorus pollutants in landscape water bodies. However, in previous river and lake pollution control and water quality improvement projects, chemicals have been used to enhance the prevention or control of eutrophication in rivers and lakes. This is not only costly, but also has poor adaptability due to climate influences. Artificial wetlands have also been used for bypass treatment, but the removal of nitrogen and phosphorus is limited. Summary of the Invention

[0005] The purpose of the present invention is to provide an in-situ enhanced denitrification and phosphorus removal system and implementation method for polluted water bodies in rivers and lakes to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An in-situ enhanced denitrification and phosphorus removal system for polluted water bodies in rivers and lakes and an implementation method thereof, comprising a prefabricated pump station, the prefabricated pump station being connected to a regulating tank, a composite biological reaction zone being provided on a side of the regulating tank away from the prefabricated pump station, a flotation zone main body being provided on a side of the composite biological reaction zone away from the regulating tank, a sludge acidification and reduction zone being provided at the bottom end of the flotation zone main body, a clean water channel main body being provided on a side of the flotation zone main body away from the composite biological reaction zone, an equipment area being provided on a side of the clean water channel main body away from the sludge acidification and reduction zone, one end of the prefabricated pump station away from the regulating tank being connected to a river, a denitrification and phosphorus removal ecological dam being provided in the middle of the river, and a landscape waterway main body being provided on a side of the denitrification and phosphorus removal ecological dam away from the prefabricated pump station.

[0008] As a preferred solution of the present invention, a first water inlet pipe is provided on the side of the regulating tank close to the prefabricated pump station, a mechanical grille is provided in the regulating tank, a lifting pump body is provided on the side of the regulating tank away from the first water inlet pipe and located in the regulating tank, a lifting pump body is provided at one end outside the regulating tank with a lifting pump pressure water pipe, and a composite biological reaction zone is connected to the end of the lifting pump pressure water pipe away from the regulating tank.

[0009] As a preferred solution of the present invention, a water distribution trough is provided on the side of the composite biological reaction zone close to the lifting pump water pressure pipe, an aerobic section is provided on the side of the composite biological reaction zone away from the water distribution trough, an underwater flow propeller is provided at the bottom end of the aerobic section close to the regulating tank, a heavy-duty composite filler is provided in the aerobic section, an external carbon source liquid inlet pipe is provided at the bottom end of the aerobic section, a partition is provided on the side of the aerobic section away from the water distribution trough, an aerobic section is provided on the side of the partition away from the aerobic section, an aeration pipe assembly is provided at the bottom end of the aerobic section, and a conventional composite filler is provided in the aerobic section.

[0010] As a preferred solution of the present invention, a flocculation tank is provided on the side of the flotation zone body close to the composite biological reaction zone, a stirrer is provided on the top of the flocculation tank, a coagulant solution inlet pipe is provided on the side of the stirrer close to the composite biological reaction zone, a dephosphorus solution inlet pipe is provided on the side of the stirrer away from the coagulant solution inlet pipe, a dissolved air water inlet pipe is provided on the side of the dephosphorus solution inlet pipe away from the stirrer, a flocculation water outlet hopper and a flotation zone inlet pipe are provided at the bottom of the stirrer, and a flocculation tank is provided on the side away from the composite biological reaction zone. There is a flotation area, the top of the flotation area is provided with a scraper, the bottom of the scraper is provided with an inclined plate assembly, the bottom of the inclined plate assembly is provided with a water distribution layer, the bottom of the flotation area is provided with a sludge hopper, the bottom of the inclined plate assembly away from the flocculation tank is provided with a clear water layer body, the flotation area is provided with a scum trough on the side away from the flocculation tank, the scum trough is provided with a clear water channel body on the side away from the flotation area, a clear water layer outlet pipe and a clear water channel inlet pipe are connected between the clear water channel body and the clear water layer body, and a clear water channel outlet pipe is provided near the top of the clear water channel body.

[0011] As a preferred solution of the present invention, an aerator, a dephosphorus agent solution tank body and a coagulant solution tank body are provided at the top of the equipment area; a dissolved air water main pipe is provided at the top of the aerator, and the end of the dissolved air water main pipe away from the aerator is connected to the dissolved air water inlet pipe; a dephosphorus agent solution tank outlet pipe is provided at the top of the dephosphorus agent solution tank body, and the end of the dephosphorus agent solution tank outlet pipe away from the dephosphorus agent solution tank body is connected to the dephosphorus agent solution inlet pipe; a coagulant solution tank outlet pipe is provided at the top of the coagulant solution tank body, and the end of the coagulant solution tank outlet pipe away from the coagulant solution tank body is connected to the coagulant solution inlet pipe; a disinfection facility is provided inside the equipment area; an aeration fan is provided at the bottom of the equipment area, an air supply pipe is provided at the bottom end of the aeration fan, an external carbon source solution tank body is provided on the side of the aeration fan away from the clear water channel body, and the bottom end of the external carbon source solution tank body is provided with an external carbon source solution tank outlet pipe.

[0012] As a preferred solution of the present invention, a landscape waterway main body is provided with a landscape waterway inlet pipe at one end close to the clean water channel main body, the landscape waterway inlet pipe is connected to the clean water channel outlet pipe at one end away from the landscape waterway main body, and a landscape waterway outlet is provided at one end of the landscape waterway main body away from the clean water channel main body.

[0013] As a preferred solution of the present invention, a base is provided at the bottom end of the denitrification and phosphorus removal ecological dam, a denitrification filling area and a dephosphorus removal filling area are respectively provided on both sides of the bottom end of the denitrification and phosphorus removal ecological dam, a biological filling area is provided at the top of the base, an ecological floating bed is provided at the end of the biological filling area away from the base, foot guards are provided at the bottom ends of both sides of the denitrification and phosphorus removal ecological dam, dam slopes are provided on both sides of the denitrification and phosphorus removal ecological dam, and emergent plants are provided on the side of the two dam slopes close to the foot guards.

[0014] According to the above-mentioned in-situ enhanced denitrification and phosphorus removal system for polluted river and lake water bodies, a method for implementing the in-situ enhanced denitrification and phosphorus removal system for polluted river and lake water bodies will also be provided, comprising the following steps:

[0015] Step 1: Build an ecological dam for deammonification and phosphorus removal at a suitable location on the river that needs to be treated and the water quality improved, dividing the river into upstream and downstream sections;

[0016] Step 2: Select an appropriate location in the upstream section to set up a prefabricated pump station. After the treated water is evenly distributed in the water distribution tank, it flows through the tank top into the composite biological reaction zone. The effluent from the aerobic section enters the flocculation tank set at the front end of the flotation zone. The dephosphorus remover is prepared by the dephosphorus remover solution tank body set in the equipment area, and then the dephosphorus remover solution tank outlet pipe and the dephosphorus remover solution inlet pipe connected thereto enter the flocculation tank. After the coagulation reaction in the flocculation tank, the treated water enters the water distribution layer through the flocculation water outlet hopper, the flotation zone inlet pipe and the dissolved air water inlet pipe connected thereto. The water flow is forcibly guided by the inclined plate assembly set above the water distribution layer to separate mud and water.

[0017] Step 3. The outflow from the main body of the clear water channel enters the main body of the landscape waterway through the clear water channel outlet pipe and the connected landscape waterway inlet pipe. The denitrification and phosphorus removal ecological dam achieves the purpose of denitrification, dephosphorization and removal of organic matter through the biological purification, filtration and adsorption functions of the denitrification filler in the denitrification filler area, the biological filler in the biological filler area, the dephosphorization filler in the dephosphorization filler area and the ecological floating bed on the top of the dam.

[0018] Compared with the existing technology, the present invention has the following beneficial effects: In previous river and lake pollution control and water quality improvement projects, some used chemicals to strengthen river and lake eutrophication prevention or control, but this was not only costly but also had poor adaptability due to climate influences. Others used artificial wetlands for bypass treatment, but this limited nitrogen and phosphorus removal. The present invention first elevates polluted river and lake water to a composite biological reaction zone and flotation zone for denitrification and phosphorus removal. The effluent is then discharged downstream through a landscape waterway into the river and lake, ensuring the water quality of the treated water supply. The use of a composite biological reaction zone and flotation process is an effective method for removing SS, degrading organic matter (BOD), and removing nitrogen and phosphorus. At the same time, the effluent passes through a gravel-paved landscape waterway, significantly improving the dissolved oxygen content and other effluent water quality indicators in the supply water. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the present invention and a diagram showing its structural relationships;

[0020] Figure 2 It is a schematic cross-sectional view of the present invention;

[0021] Figure 3 This is a vertical view of the denitrification and phosphorus removal ecological dam of the present invention.

[0022] In the figure: 1. Prefabricated pump station; 2. Equalization tank; 201. First water inlet pipe; 202. Mechanical screen; 203. Lifting pump body; 204. Lifting pump pressure pipe; 3. Composite biological reaction zone; 301. Water distribution tank; 302. Facultative aerobic section; 3021. Underwater flow propeller; 3022. Heavy-duty composite filler; 3023. External carbon source inlet pipe; 3024. Baffle; 303. Aerobic section; 3031. Aeration pipe assembly; 3032. Ordinary composite filler; 4. Main body of flotation zone; 401. Mixing and flocculation tank; 4011. Mixer; 4012. Dissolved air water inlet pipe; 4013. Phosphorus removal solution inlet pipe; 4014. Coagulant aid solution inlet pipe; 4015. Mixed flocculation water outlet hopper and flotation zone inlet pipe; 402. Flotation area; 4021. Water distribution layer; 4022. Inclined plate assembly; 4023. Slag scraper; 4024. Scum tank; 4025. Main body of clear water layer; 40 26. Clear water layer outlet pipe and clear water channel inlet pipe; 4027. Sludge hopper; 5. Sludge acidification and reduction area; 6. Clear water channel body; 601. Clear water channel outlet pipe; 7. Equipment area; 701. Aeration fan; 7011. Air transmission pipe; 702. External carbon source solution tank body; 7021. External carbon source solution tank outlet pipe; 703. Disinfection facility; 704. Dissolved air unit; 7041. Dissolved air water main pipe; 705. Phosphorus removal agent solution tank body; 70 51. Liquid outlet pipe of the dephosphorization agent solution tank; 706. Main body of the coagulant solution tank; 7061. Liquid outlet pipe of the coagulant solution tank; 8. Main body of the landscape waterway; 801. Water inlet pipe of the landscape waterway; 802. Outlet of the landscape waterway; 9. Ecological dam for denitrification and dephosphorization; 901. Base; 902. Foot guard; 903. Dam slope; 904. Emergent plants; 905. Denitrification filler area; 906. Biological filler area; 907. Phosphorus removal filler area; 908. Ecological floating bed. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0024] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Several embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present invention.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] See also Figure 1-3The present invention provides a technical solution: an in-situ enhanced denitrification and phosphorus removal system for polluted water bodies in rivers and lakes and an implementation method thereof, comprising a prefabricated pump station 1, wherein the prefabricated pump station 1 is connected to a regulating tank 2, wherein a composite biological reaction zone 3 is provided on a side of the regulating tank 2 away from the prefabricated pump station 1, wherein a flotation zone main body 4 is provided on a side of the composite biological reaction zone 3 away from the regulating tank 2, wherein a sludge acidification and reduction zone 5 is provided at the bottom end of the flotation zone main body 4, wherein a clean water channel is provided on a side of the flotation zone main body 4 away from the composite biological reaction zone 3 The main body 6, the clear water channel main body 6 is provided with an equipment area 7 on the side away from the sludge acidification reduction area 5, the prefabricated pump station 1 is connected to the river at one end away from the regulating tank 2 and a denitrification and phosphorus removal ecological dam 9 is provided in the middle of the river, the denitrification and phosphorus removal ecological dam 9 is provided with a landscape waterway main body 8 on the side away from the prefabricated pump station 1, the regulating tank 2 is provided with a first water inlet pipe 201 on the side close to the prefabricated pump station 1, a mechanical grille 202 is provided in the regulating tank 2, the regulating tank 2 is provided with a side away from the first water inlet pipe 201 and is located A lifting pump body 203 is provided in the regulating tank 2. A lifting pump pressure water pipe 204 is provided at one end of the lifting pump body 203 located outside the regulating tank 2. A composite biological reaction zone 3 is connected to the end of the lifting pump pressure water pipe 204 away from the regulating tank 2. A water distribution tank 301 is provided on the side of the composite biological reaction zone 3 close to the lifting pump pressure water pipe 204. An aerobic section 302 is provided on the side of the composite biological reaction zone 3 away from the water distribution tank 301. The bottom end of the aerobic section 302 is close to the bottom end of the lifting pump pressure water pipe 204. An underwater flow propeller 3021 is provided on one side of the regulating tank 2, a heavy-duty composite filler 3022 is provided in the facultative aerobic section 302, an external carbon source liquid inlet pipe 3023 is provided at the bottom end of the facultative aerobic section 302, a partition 3024 is provided on the side of the facultative aerobic section 302 away from the water distribution tank 301, an aerobic section 303 is provided on the side of the partition 3024 away from the facultative aerobic section 302, an aeration pipe assembly 3031 is provided at the bottom end of the aerobic section 303, and a common composite filler 3032 is provided in the aerobic section 303.

[0028] It should be noted that in this embodiment, prefabricated pump station 1 primarily comprises a cylinder, a non-clogging submersible pump, a crushing screen, a level gauge, a flushing valve, monitoring instruments, a control cabinet, a ventilation system, and associated pipes and valves. The non-clogging submersible pump draws polluted river water through a pressure pipe and a connected first inlet pipe 201 into regulating tank 2.

[0029] A mechanical screen 202 is installed in regulating tank 2 to remove fibers, skin fragments, hair, sawdust, fruit peels, vegetable peels, plastic products, etc. from the polluted river water. A lift pump body 203 and a lift pump pressure pipe 204, located at the end of regulating tank 2, then transport the polluted river water to the water distribution tank 301 of the composite biological reaction zone 3.

[0030] After being evenly distributed in the water distribution tank 301, treated water flows over the tank top into the composite biological reaction zone 3. The composite biological reaction zone 3 is divided into an aerobic section 302 and an aerobic section 303. The aerobic section accounts for 1 / 4 of the volume, while the aerobic section accounts for 3 / 4. The two sections are separated by a partition 3024 with pre-perforated holes in the lower portion. A diagonal underwater flow propeller 3021 is installed at the bottom of the aerobic section 302 to provide the 0.5-1.0 mg / L dissolved oxygen (DO) required for microbial nitrification. Heavy-duty composite packing 3022 is installed within the aerobic section 302 to support the aerobic biofilm. An aeration tube assembly 3031 is installed at the bottom of the aerobic section 303 to provide the 2.0-4.0 mg / L dissolved oxygen (DO) required for organic matter degradation and nitrification. A conventional composite packing 3032 is installed within the aerobic section 303 to support the aerobic membrane. The treated water first enters the facultative aerobic section 302, where it mixes with the nitrification solution returning from the aerobic section 302, completing the microbial denitrification reaction and converting NOx--N into N2 and N2O that escape the water surface. The treated water then enters the well-oxygenated aerobic section 303 for continuous aeration, where the majority of organic matter and ammonia nitrogen are degraded. The nitrification solution's recirculation between the facultative aerobic and facultative sections 302 and 303 utilizes the air-driven force of the aeration tube assembly 3031, eliminating the need for a nitrification solution return pump and saving energy. Because the heavy-duty composite packing 3022 in the facultative aerobic section 302 is predominantly loaded with facultative biofilm microorganisms, while the standard composite packing 3032 in the aerobic section 303 is predominantly loaded with aerobic biofilm microorganisms, nitrification and denitrification reactions occur simultaneously in each section. Since the CODcr of polluted river water is generally around 100 mg / L, its biodegradability is poor, and its BOD5 / TN ratio is low, an external carbon source is required to improve denitrification. This external carbon source is a high-quality plant-based carbon source, prepared in the external carbon source solution tank 702 located in the equipment area. It is then added to the anoxic section via the external carbon source solution tank outlet pipe 7021 and the connected external carbon source inlet pipe 3023. The functions of the composite biological reaction zone 3 are to remove organic matter, deammonify, and assist in phosphorus removal.

[0031] For example, please refer to Figure 1-3The flotation zone main body 4 is provided with a flocculation tank 401 on the side close to the composite biological reaction zone 3, a stirrer 4011 is provided at the top of the flotation tank 401, a coagulant solution inlet pipe 4014 is provided on the side of the stirrer 4011 close to the composite biological reaction zone 3, a dephosphorus solution inlet pipe 4013 is provided on the side of the stirrer 4011 away from the coagulant solution inlet pipe 4014, a dissolved air water inlet pipe 4012 is provided on the side of the dephosphorus solution inlet pipe 4013 away from the stirrer 4011, a flocculation water outlet hopper and a flotation zone inlet pipe 4015 are provided at the bottom of the stirrer 4011, and the flotation zone main body 4 is provided with a flocculation water outlet hopper and a flotation zone inlet pipe 4015. A flotation area 402 is provided on one side of the combined biological reaction zone 3. A scraper 4023 is provided at the top of the flotation area 402. A slag plate assembly 4022 is provided at the bottom of the scraper 4023. A water distribution layer 4021 is provided at the bottom of the flotation area 402. A sludge hopper 4027 is provided at the bottom of the flotation area 402. A clear water layer body 4025 is provided at the bottom of the slag plate assembly 4022 away from the flocculation tank 401. A scum trough 4024 is provided on the side of the flotation area 402 away from the flocculation tank 401. A clear water channel body 6 is provided on the side of the scum trough 4024 away from the flotation area 402. The clear water channel body 6 and the clear water layer body 40 25 is connected with a clear water layer outlet pipe and a clear water channel inlet pipe 4026, the clear water channel body 6 is provided with a clear water channel outlet pipe 601 near the top, the top of the equipment area 7 is provided with a dissolving unit 704, a dephosphorization agent solution tank body 705 and a coagulant solution tank body 706, the top of the dissolving unit 704 is provided with a dissolved air water main pipe 7041, the dissolved air water main pipe 7041 is away from the end of the dissolving unit 704 and the dissolved air water inlet pipe 4012, the top of the dephosphorization agent solution tank body 705 is provided with a dephosphorization agent solution tank outlet pipe 7051, the dephosphorization agent solution tank outlet pipe 7051 is away from the end of the dephosphorization agent solution tank body 705 and the The dephosphorization agent solution inlet pipe 4013 is connected to Eji, and the top of the coagulant aid solution tank body 706 is provided with a coagulant aid solution tank outlet pipe 7061, and the coagulant aid solution tank outlet pipe 7061 is connected to the coagulant aid solution inlet pipe 4014 at one end away from the coagulant aid solution tank body 706. A disinfection facility 703 is provided inside the equipment area 7, and an aeration fan 701 is provided at the bottom end of the equipment area 7. An air supply pipe 7011 is provided at the bottom end of the aeration fan 701. An external carbon source solution tank body 702 is provided at the side of the aeration fan 701 away from the clean water channel body 6, and an external carbon source solution tank outlet pipe 7021 is provided at the bottom end of the external carbon source solution tank body 702.

[0032] It should be noted that in this embodiment, the effluent from the aerobic section 303 enters the coagulation tank 401 located at the front end of the main flotation zone 4. The dephosphorus remover is prepared in the dephosphorus remover solution tank 705 located in the equipment area, and then enters the coagulation tank 401 through the dephosphorus remover solution tank outlet pipe 7051 and the connected dephosphorus remover solution inlet pipe 4013. The coagulant is prepared in the coagulant aid solution tank 706 located in the equipment area, and then enters the coagulation tank 401 through the coagulant aid solution tank outlet pipe 7061 and the connected coagulant aid solution inlet pipe 4014. The dephosphorus remover is a new, high-efficiency dephosphorus remover; the coagulant is polyacrylamide (PAM). Agitator 4011 is activated to thoroughly mix the chemical and water in the tank. The coagulation time is 40 minutes.

[0033] After coagulation in the flocculation tank 401, treated water enters the water distribution layer 4021 through the flocculation water outlet hopper, the flotation zone inlet pipe 4015, and the connected dissolved air water inlet pipe 4012. The inclined plate assembly 4022, located above the water distribution layer 4021, forcibly directs the water flow for mud-water separation. Heavier phosphorus-containing sludge settles first in the sludge hopper 4027; lighter oil, fine suspended matter, algae, and other particles combine with air bubbles and rise to the top of the water flow, forming scum. This scum is collected by the scraper 4023 in the scum tank 4024. After mud-water separation, the clean water enters the clean water channel 6 through the clean water layer main body 4025, the clean water layer outlet pipe, and the clean water channel inlet pipe 4026. Disinfectant is added to the clean water channel 6 by the disinfection facility 703 located in the equipment area. The flotation zone main body 4 functions to remove fine suspended matter, algae, and other particles, as well as to chemically remove phosphorus.

[0034] For example, please refer to Figure 1-3 The end of the landscape waterway main body 8 close to the clean water channel main body 6 is provided with a landscape waterway inlet pipe 801, and the end of the landscape waterway inlet pipe 801 away from the landscape waterway main body 8 is connected to the clean water channel outlet pipe 601, and the end of the landscape waterway main body 8 away from the clean water channel main body 6 is provided with a landscape waterway outlet 802. The bottom end of the denitrification and phosphorus removal ecological dam 9 is provided with a base 901, and the two sides of the bottom end of the denitrification and phosphorus removal ecological dam 9 are respectively provided with a denitrification filling area 905 and a phosphorus removal filling area 907. The top of the base 901 is provided with a biological filling area 906, and the end of the biological filling area 906 away from the base 901 is provided with an ecological floating bed 908. The bottom ends of both sides of the denitrification and phosphorus removal ecological dam 9 are provided with foot guards 902, and the denitrification and phosphorus removal ecological dam 9 is provided with dam slopes 903 on both sides, and the two dam slopes 903 are provided with emergent plants 904 on the side close to the foot guards 902.

[0035] It should be noted that in this embodiment, the outflow from the main clean water channel 6 enters the main landscape waterway 8 through the clean water channel outlet pipe 601 and the connected landscape waterway inlet pipe 801. The landscape waterway is maintained at a depth of 0.5-0.8m to enhance the natural oxygenation of the water. The gravel laid on the bottom and sides not only creates turbulence in the water, improving oxygenation, but also further utilizes the ecological gravel's water purification principles of ammonia and phosphorus removal, assisting the integrated purification equipment such as the composite biological reaction zone 3 and the main flotation zone 4 to further purify the outflow. The outflow from the landscape waterway enters the downstream section of the river through the landscape waterway outlet.

[0036] The denitrification and phosphorus removal ecological dam 9 achieves denitrification, phosphorus removal, and organic matter removal through the biological purification, filtration, and adsorption functions of the denitrification filler area 905, the biological filler area 906, the phosphorus removal filler area 907, and the ecological floating bed 908 on the dam top. The deammonification and phosphorus removal ecological dam 9 removes nitrogen and phosphorus from the upstream river water and divides the river into upstream and downstream sections, facilitating water exchange after bypass treatment and increasing water mobility.

[0037] According to the above embodiment, a method for implementing an in-situ enhanced denitrification and phosphorus removal system for polluted water bodies in rivers and lakes is also provided, comprising the following steps:

[0038] Step 1: construct an ecological dam for deammonification and phosphorus removal 9 at a suitable location of the river that needs to be governed and the water quality improved, dividing the river into an upstream section and a downstream section;

[0039] Step 2: Select an appropriate location in the upstream section to set up a prefabricated pump station 1. After being evenly distributed in the water distribution tank 301, the treated water flows through the tank top into the composite biological reaction zone 3. The effluent from the aerobic section 303 enters the flocculation tank 401 provided at the front end of the flotation zone body 4. The dephosphorus remover is prepared by the dephosphorus remover solution tank body 705 provided in the equipment area 7. The dephosphorus remover solution tank outlet pipe 7051 and the dephosphorus remover solution inlet pipe 4013 connected thereto enter the flocculation tank 401. After the coagulation reaction in the flocculation tank 401, the treated water enters the water distribution layer 4021 through the flocculation water outlet hopper, the flotation zone inlet pipe 4015, and the dissolved air water inlet pipe 4012 connected thereto. The water flow is forcibly guided by the inclined plate assembly 4022 provided above the water distribution layer 4021 to separate mud and water.

[0040] Step 3. The outlet water of the clean water channel main body 6 enters the landscape waterway main body 8 through the clean water channel outlet pipe 601 and the landscape waterway inlet pipe 801 connected thereto. The denitrification and phosphorus removal ecological dam 9 achieves the purpose of denitrification, dephosphorization and removal of organic matter through the biological purification, filtration and adsorption functions of the denitrification filler in the denitrification filler area 905, the biological filler in the biological filler area 906, the phosphorus removal filler in the phosphorus removal filler area 907 and the ecological floating bed 908 on the top surface of the dam.

[0041] The present invention's workflow: Prefabricated pump station 1 primarily consists of a cylinder, a non-clogging submersible pump, a crushing grid, a level gauge, a flushing valve, monitoring instruments, a control cabinet, a ventilation system, and associated pipes and valves. The non-clogging submersible pump draws polluted river water through a pressure pipe and a connected first inlet pipe 201 into a regulating tank 2.

[0042] A mechanical screen 202 is installed in regulating tank 2 to remove fibers, skin fragments, hair, sawdust, fruit peels, vegetable peels, plastic products, etc. from the polluted river water. A lift pump body 203 and a lift pump pressure pipe 204, located at the end of regulating tank 2, then transport the polluted river water to the water distribution tank 301 of the composite biological reaction zone 3.

[0043] After being evenly distributed in the water distribution tank 301, treated water flows over the tank top into the composite biological reaction zone 3. The composite biological reaction zone 3 is divided into an aerobic section 302 and an aerobic section 303. The aerobic section accounts for 1 / 4 of the volume, while the aerobic section accounts for 3 / 4. The two sections are separated by a partition 3024 with pre-perforated holes in the lower portion. A diagonal underwater flow propeller 3021 is installed at the bottom of the aerobic section 302 to provide the 0.5-1.0 mg / L dissolved oxygen (DO) required for microbial nitrification. Heavy-duty composite packing 3022 is installed within the aerobic section 302 to support the aerobic biofilm. An aeration tube assembly 3031 is installed at the bottom of the aerobic section 303 to provide the 2.0-4.0 mg / L dissolved oxygen (DO) required for organic matter degradation and nitrification. A conventional composite packing 3032 is installed within the aerobic section 303 to support the aerobic membrane. The treated water first enters the facultative aerobic section 302, where it mixes with the nitrification solution returning from the aerobic section 302, completing the microbial denitrification reaction and converting NOx--N into N2 and N2O that escape the water surface. The treated water then enters the well-oxygenated aerobic section 303 for continuous aeration, where the majority of organic matter and ammonia nitrogen are degraded. The nitrification solution's recirculation between the facultative aerobic and facultative sections 302 and 303 utilizes the air-driven force of the aeration tube assembly 3031, eliminating the need for a nitrification solution return pump and saving energy. Because the heavy-duty composite packing 3022 in the facultative aerobic section 302 is predominantly loaded with facultative biofilm microorganisms, while the standard composite packing 3032 in the aerobic section 303 is predominantly loaded with aerobic biofilm microorganisms, nitrification and denitrification reactions occur simultaneously in each section. Since the CODcr of polluted river water is generally around 100 mg / L, its biodegradability is poor, and its BOD5 / TN ratio is low, an external carbon source is required to improve denitrification. This external carbon source is a high-quality plant-based carbon source, prepared in the external carbon source solution tank 702 located in the equipment area. It is then added to the anoxic section via the external carbon source solution tank outlet pipe 7021 and the connected external carbon source inlet pipe 3023. The functions of the composite biological reaction zone 3 are to remove organic matter, deammonify, and assist in phosphorus removal.

[0044] The effluent from the aerobic section 303 enters the coagulation tank 401 located at the front end of the main flotation zone 4. The dephosphorus remover is prepared in the dephosphorus remover solution tank 705 located in the equipment area, and then enters the coagulation tank 401 through the dephosphorus remover solution tank outlet pipe 7051 and the connected dephosphorus remover solution inlet pipe 4013. The coagulant is prepared in the coagulant aid solution tank 706 located in the equipment area, and then enters the coagulation tank 401 through the coagulant aid solution tank outlet pipe 7061 and the connected coagulant aid solution inlet pipe 4014. The dephosphorus remover is a new, high-efficiency dephosphorus remover; the coagulant is polyacrylamide (PAM). The agitator 4011 is started to thoroughly mix the chemical and water in the tank. The coagulation time is 40 minutes.

[0045] After coagulation in the flocculation tank 401, treated water enters the water distribution layer 4021 through the flocculation water outlet hopper, the flotation zone inlet pipe 4015, and the connected dissolved air water inlet pipe 4012. The inclined plate assembly 4022, located above the water distribution layer 4021, forcibly directs the water flow for mud-water separation. Heavier phosphorus-containing sludge settles first in the sludge hopper 4027; lighter oil, fine suspended matter, algae, and other particles combine with air bubbles and rise to the top of the water flow, forming scum. This scum is collected by the scraper 4023 in the scum tank 4024. After mud-water separation, the clean water enters the clean water channel 6 through the clean water layer main body 4025, the clean water layer outlet pipe, and the clean water channel inlet pipe 4026. Disinfectant is added to the clean water channel 6 by the disinfection facility 703 located in the equipment area. The flotation zone main body 4 functions to remove fine suspended matter, algae, and other particles, as well as to chemically remove phosphorus.

[0046] Water from the main clean water channel 6 flows through the clean water channel outlet pipe 601 and the connected landscape waterway inlet pipe 801 into the main landscape waterway 8. The landscape waterway is maintained at a depth of 0.5-0.8m to enhance the natural oxygenation of the water. Gravel is laid on the bottom and sides to create turbulence in the water, improving oxygenation. Furthermore, the ecological gravel's water purification mechanism, through ammonia and phosphorus removal, further purifies the effluent through the integrated purification equipment, including the composite biological reaction zone 3 and the main flotation zone 4. Water from the landscape waterway then flows downstream through the landscape waterway outlet.

[0047] The denitrification and phosphorus removal ecological dam 9 achieves denitrification, phosphorus removal, and organic matter removal through the biological purification, filtration, and adsorption functions of the denitrification filler area 905, the biological filler area 906, the phosphorus removal filler area 907, and the ecological floating bed 908 on the dam top. The deammonification and phosphorus removal ecological dam 9 removes nitrogen and phosphorus from the upstream river water and divides the river into upstream and downstream sections, facilitating water exchange after bypass treatment and increasing water mobility.

[0048] When the polluted river water quality is within the range of CODcr: 150mg / L, BOD5: 11mg / L, NH3-N: 14mg / L, TN: 15mg / L, and TP: 1.7mg / L, an in-situ enhanced denitrification and phosphorus removal system and implementation method for polluted river and lake water is used to treat the river water. After treatment, the river water quality can meet the "Water Quality Standard for Sewage Recycling and Landscape Water" (GB / T 18921-2002).

[0049] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An in-situ enhanced denitrification and dephosphorization system for polluted water bodies in rivers and lakes, comprising a prefabricated pump station (1), characterized in that: The prefabricated pump station (1) is connected to a regulating tank (2), a composite biological reaction zone (3) is provided on the side of the regulating tank (2) away from the prefabricated pump station (1), a flotation zone body (4) is provided on the side of the composite biological reaction zone (3) away from the regulating tank (2), a sludge acidification reduction zone (5) is provided at the bottom of the flotation zone body (4), a clear water channel body (6) is provided on the side of the flotation zone body (4) away from the composite biological reaction zone (3), an equipment zone (7) is provided on the side of the clear water channel body (6) away from the sludge acidification reduction zone (5), one end of the prefabricated pump station (1) away from the regulating tank (2) is connected to a river, and a denitrification and dephosphorization ecological dam (9) is provided in the middle of the river, and a landscape waterway body (8) is provided on the side of the denitrification and dephosphorization ecological dam (9) away from the prefabricated pump station (1); A first water inlet pipe (201) is provided on a side of the regulating tank (2) close to the prefabricated pump station (1); a mechanical grille (202) is provided in the regulating tank (2); a lifting pump body (203) is provided on a side of the regulating tank (2) away from the first water inlet pipe (201) and located in the regulating tank (2); a lifting pump pressure water pipe (204) is provided at one end of the lifting pump body (203) located outside the regulating tank (2); and a composite biological reaction zone (3) is connected to the end of the lifting pump pressure water pipe (204) away from the regulating tank (2); The composite biological reaction zone (3) is provided with a water distribution tank (301) on a side close to the lifting pump pressure water pipe (204), and an oxygen-enriched section (302) is provided on a side of the composite biological reaction zone (3) away from the water distribution tank (301). An underwater flow propeller (3021) is provided at the bottom end of the oxygen-enriched section (302) close to the regulating tank (2). A heavy-duty composite filler (3022) is provided in the oxygen-enriched section (302). An external carbon source liquid inlet pipe (3023) is provided at the bottom end of the oxygen-enriched section (302). A partition (3024) is provided on the side away from the water distribution tank (301), an aerobic section (303) is provided on the side of the partition (3024) away from the facultative aerobic section (302), an aeration pipe assembly (3031) is provided at the bottom end of the aerobic section (303), and a common composite filler (3032) is provided in the aerobic section (303); a flocculation tank (401) is provided on the side of the flotation zone body (4) close to the composite biological reaction zone (3), and the top of the flocculation tank (401) is provided with a mixing and flocculation tank (401). A mixer (4011) is provided at the end thereof, a coagulant solution inlet pipe (4014) is provided on the side of the mixer (4011) close to the composite biological reaction zone (3), a dephosphorus solution inlet pipe (4013) is provided on the side of the mixer (4011) away from the coagulant solution inlet pipe (4014), a dissolved air water inlet pipe (4012) is provided on the side of the dephosphorus solution inlet pipe (4013) away from the mixer (4011), and the bottom end of the mixer (4011) is provided with a coagulant solution inlet pipe (4014). A mixed flocculation water outlet hopper and a flotation zone water inlet pipe (4015) are provided. A flotation zone (402) is provided on a side of the mixed flocculation tank (401) away from the composite biological reaction zone (3). A scraper (4023) is provided at the top of the flotation zone (402). An inclined plate assembly (4022) is provided at the bottom of the scraper (4023). A water distribution layer (4021) is provided at the bottom of the inclined plate assembly (4022). A sludge hopper (4027) is provided at the bottom of the flotation zone (402). The bottom end of the inclined plate assembly (4022) away from the flocculation tank (401) is provided with a clear water layer body (4025); the side of the flotation area (402) away from the flocculation tank (401) is provided with a scum tank (4024); the side of the scum tank (4024) away from the flotation area (402) is provided with a clear water channel body (6); a clear water layer outlet pipe and a clear water channel inlet pipe (4026) are connected between the clear water channel body (6) and the clear water layer body (4025); and a clear water channel outlet pipe (601) is provided near the top of the clear water channel body (6); The bottom end of the denitrification and phosphorus removal ecological dam (9) is provided with a base (901), and the two sides of the bottom end of the denitrification and phosphorus removal ecological dam (9) are respectively provided with a denitrification filling area (905) and a phosphorus removal filling area (907), the top of the base (901) is provided with a biological filling area (906), and the end of the biological filling area (906) away from the base (901) is provided with an ecological floating bed (908), the bottom ends of both sides of the denitrification and phosphorus removal ecological dam (9) are provided with foot guards (902), and the two sides of the denitrification and phosphorus removal ecological dam (9) are provided with dam slopes (903), and the two sides of the dam slopes (903) close to the foot guards (902) are provided with emergent plants (904).

2. The in-situ enhanced denitrification and phosphorus removal system for polluted river and lake water according to claim 1, characterized in that: The top of the equipment area (7) is provided with an air dissolving unit (704), a dephosphorization agent solution tank body (705) and a coagulant aid solution tank body (706); the top of the air dissolving unit (704) is provided with a dissolved air water main pipe (7041); the end of the dissolved air water main pipe (7041) away from the air dissolving unit (704) is connected to the dissolved air water inlet pipe (4012); the top of the dephosphorization agent solution tank body (705) is provided with a dephosphorization agent solution tank outlet pipe (7051); the end of the dephosphorization agent solution tank outlet pipe (7051) away from the dephosphorization agent solution tank body (705) is connected to the dephosphorization agent solution inlet pipe (4013); the top of the coagulant aid solution tank body (706) is provided with a coagulant aid solution tank outlet pipe (7061); The coagulant solution tank outlet pipe (7061) is connected to the coagulant solution inlet pipe (4014) at one end away from the coagulant solution tank body (706), a disinfection facility (703) is provided inside the equipment area (7), an aeration fan (701) is provided at the bottom end of the equipment area (7), an air supply pipe (7011) is provided at the bottom end of the aeration fan (701), an external carbon source solution tank body (702) is provided at the side of the aeration fan (701) away from the clear water channel body (6), and an external carbon source solution tank outlet pipe (7021) is provided at the bottom end of the external carbon source solution tank body (702).

3. The in-situ enhanced denitrification and phosphorus removal system for polluted river and lake water according to claim 2, characterized in that: The landscape waterway main body (8) is provided with a landscape waterway inlet pipe (801) at one end close to the clear water channel main body (6), and the landscape waterway inlet pipe (801) is connected to the clear water channel outlet pipe (601) at one end away from the landscape waterway main body (8). The landscape waterway main body (8) is provided with a landscape waterway outlet (802) at one end away from the clear water channel main body (6).

4. The method for implementing the in-situ enhanced denitrification and phosphorus removal system for polluted river and lake water bodies according to claim 3, characterized in that: The following steps are involved: Step 1: construct a denitrification and phosphorus removal ecological dam (9) at a suitable location of the river that needs to be governed and the water quality improved, and divide the river into an upstream section and a downstream section; Step 2: select a suitable location in the upstream section to set up a prefabricated pump station (1), and the treated water after being evenly distributed in the water distribution tank (301) flows through the top of the tank into the composite biological reaction zone (3), and the effluent of the aerobic section (303) enters the flocculation tank (401) set at the front end of the flotation zone body (4), and the dephosphorus removal agent is prepared by the dephosphorus removal agent solution tank body (705) set in the equipment area (7) and the dephosphorus removal agent solution tank outlet pipe (7051) and the dephosphorus removal agent solution inlet pipe (4013) connected thereto into the flocculation tank (401). The treated water after coagulation reaction in the flocculation tank (401) flows through the flocculation water outlet hopper and the flotation zone inlet pipe (4015) The dissolved air water inlet pipe (4012) connected thereto enters the water distribution layer (4021), and the inclined plate assembly (4022) arranged above the water distribution layer (4021) forcibly guides the water flow to separate mud and water; Step 3: The outflow of the main body of the clean water channel (6) enters the main body of the landscape water channel (8) through the outlet pipe (601) of the clean water channel and the connected landscape waterway inlet pipe (801). The denitrification and phosphorus removal ecological dam (9) achieves the purpose of denitrification and phosphorus removal and removal of organic matter through the biological purification, filtration and adsorption functions of the denitrification filler of the denitrification filler area (905), the biological filler of the biological filler area (906), the phosphorus removal filler of the phosphorus removal filler area (907) and the ecological floating bed (908) on the top surface of the dam.

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