CN102040316A - Method for purifying ecological compound sludge water body - Google Patents

Abstract

The invention discloses a method for purifying water body with ecological composite sludge. The anaerobic tank, intermediate sedimentation tank, ecological composite sludge system, and sludge return system are set up in sequence; the sewage enters the anaerobic tank to remove organic matter and release phosphorus, and then enters the intermediate sedimentation tank to undergo solid-liquid separation, and the separated supernatant It flows in from the upper part of the main ecological composite sludge system, and then passes through the ecological area, nitrification area, activated sludge dephosphorization area and catchment area, and then discharges the system; the activated sludge separated from the intermediate sedimentation tank directly enters the main ecological composite sludge system. Activated sludge phosphorus removal area, and then through the catchment area for solid-liquid separation, the supernatant is discharged out of the system. A sludge return system is set between the activated sludge dephosphorization zone and the anaerobic tank at the bottom of the ecological composite sludge system to facilitate the anaerobic phosphorus release of the sludge. The invention has the advantages of stable operation, low investment and operation cost, convenient management, high-efficiency pollutant removal effect and the like.

Description

Water Purification Method of Ecological Composite Sludge

technical field

The invention relates to a method for treating sewage, in particular to a method for purifying ecological composite sludge water body.

Background technique

Due to the large difference in water quality between rural sewage and urban wastewater, rural domestic sewage is mainly toilet flushing sewage, cooking and drinking sewage, bathing, laundry sewage, etc. The organic pollutant content in sewage is lower than that in urban sewage, and the main pollutants are COD, nitrogen and Phosphorus, water quality is relatively stable. Therefore, we cannot simply copy urban wastewater treatment technology to rural areas for rural sewage treatment. At present, the choice of rural sewage treatment technology is generally based on the population size of the countryside. In economically backward and less populated areas, ecological treatment technologies such as artificial wetlands, oxidation ponds, and plant ponds are generally used to further treat the sewage discharged from septic tanks and make full use of the environment. capacity to achieve the purpose of sewage treatment, and for rural areas with large population density, SBR, A/O, and A2/O processes are used. However, the traditional mode of constructing centralized sewage plants and sewage treatment technology has problems such as large area, huge pipeline network investment, high operating costs, high sludge production and subsequent treatment, which is not suitable for scattered sewage discharge points in rural areas with relatively backward economic levels. Applicable, it is urgent to develop new core technologies.

Contents of the invention

The object of the present invention is to solve the above problems, and closely combine the ecological method, the biofilm method and the activated sludge method in one reactor, and provide a method with low sludge output, low energy consumption, and denitrification and phosphorus removal. The ecological compound sludge water body purification method with high effect can not only be used for the treatment of domestic sewage in vast rural areas lacking municipal facilities, but also can be used for the treatment of industrial wastewater such as food processing wastewater and slaughter wastewater.

The technical problem to be solved by the present invention is to provide an ecological composite sludge water purification device with the function of removing COD, nitrogen and phosphorus, which can fully purify the water body through the actions of physics, chemistry, plants and microorganisms, and overcome the problems caused by traditional urban sewage. The treatment technology is used for problems such as excessive sludge production in rural areas, large-scale aeration in the denitrification and phosphorus removal process, and high infrastructure and operating costs brought about by nitrification liquid return facilities.

Technical scheme of the present invention is:

1. Set up anaerobic tank, intermediate sedimentation tank, ecological composite sludge system, and sludge return system in sequence; the anaerobic tank is used for the removal of organic matter and the release of phosphorus in the return sludge, and the intermediate sedimentation tank is used for the effluent of the anaerobic tank solid-liquid separation;

2. A partition is set in the ecological composite sludge system to divide the system into the main reaction area and the water collection area, and the bottom of the two areas is connected;

3. The upper part of the main reaction area of the ecological composite sludge system is provided with an ecological area surrounded by a frame and a screen, and the screen is filled with volcanic rock and/or biological ceramsite and/or zeolite particles and/or particles with a particle size of 1-20mm. Quartz sand granular filler on which wet emergent plants are planted. During the growth process, the plant root system can cover the entire granular filler area and disperse into the nitrification area through the screen. The organic matter and dissolved oxygen secreted by the root system provide part of the carbon source and dissolved oxygen for the nitrification reaction, which solves the problem of rural domestic sewage. Low carbon source concentration inhibits the nitrification process, and plant root oxygen secretion reduces the amount of artificial aeration required for the nitrification process, thereby reducing energy consumption;

4. In the middle of the main reaction zone of the ecological composite sludge system, a nitrification zone composed of suspended sparse packing and aeration system is set. The sparse packing is fiber bundle packing and/or combined packing and/or elastic packing to provide the growth of nitrifying bacteria; The upper end of the sparse packing is fixed at the bottom of the screen in the ecological area, and the lower end is fixed relatively to the steel wire set at the lower part of the frame; the ecological composite sludge system is equipped with an online redox potential monitor, which is connected to the aeration system. When the redox potential in the area is too low When the redox potential reaches the set requirement, the aeration system will be turned off automatically, so as to reduce energy consumption;

5. The lower part of the main reaction area of the ecological composite sludge system is equipped with an activated sludge dephosphorization area. The nitrate nitrogen produced in the nitrification area enters the dephosphorization area along with the water flow to denitrify and accumulate phosphorus to achieve phosphorus removal, avoiding the traditional denitrification process. The reflux of nitrification liquid reduces the cost of infrastructure and operation; denitrification and phosphorus accumulation have the advantages of one carbon and two uses, and the removal of phosphorus can be realized simultaneously in the process of denitrification and denitrification, which overcomes the limitation of insufficient carbon source in rural sewage on the purification effect. At the same time, compared with the traditional aerobic phosphorus removal, it reduces the infrastructure and operation costs caused by aeration, and plays a role in reducing the sludge production;

6. A sludge return system is installed at the bottom of the ecological composite sludge system, and the sludge returns to the anaerobic tank for the release of phosphorus;

7. Pollutants in the water flow through the ecological composite sludge system through adsorption and co-precipitation with the granular filler in the ecological zone, are taken up by plants, and are removed by the microorganisms attached to the filler and the activated sludge at the bottom of the system.

The invention treats domestic sewage in rural areas and industrial waste water from food processing industry and slaughtering industry, and can achieve high-efficiency pollutant removal effect, and has the advantages of stable operation, low investment and operation cost, convenient management, beautiful appearance and practicality.

Description of drawings

Fig. 1 is a schematic diagram of the ecological composite sludge water purification method of the present invention.

Marks in the figure: A. water inlet; B. water outlet; 1. anaerobic tank; 2. intermediate sedimentation tank; 3. ecological composite sludge system; 4. ecological area; 5. nitrification area; 6. activated sludge Phosphorus removal area; 7. catchment area; 8. frame; 9. clapboard; 10. granular packing; 11. screen; 12. steel wire; 13. sparse packing; 16. Plant root system; 17. Agitator; 18. Supernatant liquid inlet; 19. Sludge inlet; 20. Sludge return system; 21. Wet emergent plants; 22. Main reaction area.

Detailed ways

Example:

As shown in Figure 1, it is composed of three parts: anaerobic tank 1, intermediate sedimentation tank 2, and ecological composite sludge system 3, wherein an agitator 17 is set in anaerobic tank 1 to prevent sludge sedimentation. The ecological composite sludge system 3 is the main body of the water purification device, and is composed of an ecological area 4, a nitrification area 5, an activated sludge dephosphorization area 6 and a water collection area 7. Regions are separated. Among them, the ecological area 4 is filled with granular filler 10, on which wet emergent plants 21 are planted, and the plant roots 16 are covered with the filler area; the nitrification area 5 is suspended with sparse filler 13, and the upper end of the sparse filler 13 is fixed on the bottom of the screen 11, and the lower end is fixed on the frame. 8 on the steel wire 12 at the bottom. The nitrification zone 5 is provided with an aeration system 15 and an online redox potential monitoring system 14 connected thereto, and oxygen is supplied to the nitrification zone 5 through the aeration system 15 .

The size of the anaerobic tank is: length×width×height=20cm×10cm×50cm, and an agitator 17 with adjustable speed is provided. The intermediate sedimentation tank 2 has a circular cross section, a diameter of 15 cm, and a height of 50 cm. The size of the ecological composite sludge system 3 is: length × width × height = 25cm × 20cm × 60cm, wherein the partition plate 9 separates the main reaction area 22 and the catchment area 7 into 4:1, that is, the size of the catchment area 7 is: length × width × height = 5 cm × 20 cm × 60 cm, the size of the main reaction area 22 is: length × width × height = 20 cm × 20 cm × 60 cm, the height of the connection between the bottom of the two areas is 20 cm. The main reaction zone 22 of the ecological composite sludge system 3 is, from top to bottom, an ecological zone 4, a nitrification zone 5, and an activated sludge phosphorus removal zone 6. The heights of the three zones are 15cm, 25cm, and 20cm, respectively. Among them, the ecological area 4 is filled with volcanic rock particle filler 10, with a particle size of 3-8 mm, and 21 wet emergent plants (canna) are planted on it, and the planting density is 20 to 30 plants/square meter, and the root system of the plant can be deeply covered with the entire particle filler. area, and can further grow through the screen 11 in the nitrification area 5 area. The fiber bundle sparse packing 13 is suspended in the nitrification zone 5, the upper end is fixed on the bottom of the screen 11, and the lower end is relatively fixed to the steel wire 12 provided at the bottom of the frame 8. The fiber bundle sparse packing 13 has a single piece diameter of 15 cm, and the distance between installation centers is 20 cm.

The sewage purification process is as follows: the sewage first enters the anaerobic tank 1 to remove organic matter and release phosphorus, and then enters the intermediate sedimentation tank 2 to undergo solid-liquid separation. The separated supernatant is fed into the upper part of the main ecological composite sludge system 3 Water port 18 flows in, passes through ecological zone 4, nitrification zone 5, activated sludge dephosphorization zone 6 and catchment zone 7, and then discharges into the system; the activated sludge 19 separated from the intermediate sedimentation tank 2 directly enters the main ecological composite sludge system 3 The activated sludge dephosphorization area 6 is then separated from the solid and liquid through the catchment area 7, and the supernatant is discharged out of the system. A sludge return system 20 is set between the activated sludge dephosphorization zone 6 at the bottom of the ecological composite sludge system 3 and the anaerobic tank 1 to facilitate the anaerobic phosphorus release of the sludge.

The ecological composite sludge system 3 is used to purify domestic sewage, and the continuous water intake method is adopted. The hydraulic retention time of the anaerobic tank 1, the intermediate sedimentation tank 2 and the main reaction zone 22 are 6h, 1.5h and 7h respectively, and the sludge return ratio is 50 %, after a three-month start-up operation, the average concentration of each pollutant in the raw water quality and the effluent water quality treated by this system is shown in Table 1.

Table 1: Influent and effluent water quality table

TP Nitrate nitrogen Ammonia nitrogen COD Influent water (mg/L) 11.43 20.16 17.61 107.52 Effluent (mg/L) 7.39 0.58 5.88 13.44 Removal rate (%) 35.35 97.12 60.61 87.50

As shown in Table 1, the ecological compound sludge water purification method can effectively remove nitrate nitrogen, ammonia nitrogen and organic matter in the water body, and also has a certain removal effect on phosphorus.

The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the scope of this invention. The protection scope of the technical solution of the invention.

Claims (1)

1. an ecological compound sludge water body purification method is characterized in that the concrete steps are: 1. Anaerobic tank (1), intermediate sedimentation tank (2), ecological composite sludge system (3), and sludge return system (20) are set in sequence; the anaerobic tank (1) is used to remove organic matter and return sludge For the release of medium phosphorus, the intermediate sedimentation tank (2) is used for solid-liquid separation in the effluent of the anaerobic tank (1); 2. A partition (9) is set in the ecological composite sludge system (3) to divide the system into a main reaction area (22) and a water collection area (7) left and right, and the bottoms of the two areas are connected; 3. The upper part of the main reaction zone (22) of the ecological composite sludge system (3) is provided with an ecological zone (4) enclosed by a frame (8) and a screen (11), and the filling in the screen (11) preferably has a particle size of 1 -20mm of volcanic rock and/or biological ceramsite and/or zeolite particles and/or quartz sand particle fillers (10), on which wet emergent plants (21) are planted; plant roots (16) can be covered with during growth The entire particle packing area is dispersed into the nitrification area (5) through the screen (11), and the organic matter and dissolved oxygen secreted by the root system provide part of the carbon source and dissolved oxygen for the occurrence of the nitrification reaction, and at the same time, the oxygen secreted by the plant root system reduces the nitrification process The amount of artificial aeration required, thereby reducing energy consumption; 4. The middle part of the main reaction zone (22) of the ecological composite sludge system (3) is provided with a nitrification zone (5) composed of suspended sparse packing (13) and an aeration system (15), and the sparse packing (13) is fiber bundle packing And/or combined filler and/or elastic filler provide the hanging film growth of nitrifying bacteria; Sparse filler (13) upper end is fixed on the screen cloth (11) bottom of ecological zone (4), and the steel wire ( 12) Relatively fixed; the ecological composite sludge system (3) is equipped with an online oxidation-reduction potential monitor (14), and is connected to the aeration system (15), and the aeration system (15) is turned on when the oxidation-reduction potential in the area is too low , when the oxidation-reduction potential reaches the set requirement, the aeration system (15) is automatically closed, thereby achieving the purpose of reducing energy consumption; 5. Ecological composite sludge system (3) The lower part of the main reaction area (22) is equipped with an activated sludge phosphorus removal area (6), and the nitrate nitrogen produced in the nitrification area (5) enters the activated sludge phosphorus removal area (6) with the water flow Denitrification and phosphorus accumulation occur to realize the removal of phosphorus, avoiding the reflux of nitrifying liquid in the traditional denitrification process; 6. A sludge return system (20) is installed at the bottom of the ecological composite sludge system (3), and the sludge returns to the anaerobic tank (1) for phosphorus release; 7. Pollutants in water are absorbed by plants through adsorption and co-precipitation with the ecological zone (4) granular filler (10) in the process of flowing through the ecological composite sludge system (3), and are absorbed by the microorganisms attached to the filler and the bottom of the system Activated sludge is removed by metabolism.

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