A plateau low-temperature sewage treatment device and treatment method

Abstract

The present invention discloses a plateau low-temperature sewage treatment device and a treatment method, wherein the treatment device structure is: a water inlet and a sludge return port are provided on the regulating tank; a fender is provided on the anaerobic tank, a lamp-tube type intubation is obliquely arranged on the aerobic tank, and a water outlet is provided on the disinfection tank; a microporous aeration head is provided at the outlet end of the lamp-tube type intubation, and the microporous aeration head is connected to the aeration pipe; a sludge outlet is provided below the regulating tank, the anaerobic tank and the aerobic tank; a transmission belt is provided below the aerobic tank, and a heater is provided under the transmission belt; the specific structure of the lamp-tube type intubation is: a spherical carrier is fixed at a certain distance in the tube wall of the lamp-tube type intubation, and the spherical carrier includes a fixing ring fixed to the tube wall, a spherical carrier frame connected to the fixing ring, and a filler inside the spherical carrier frame. The present invention overcomes the problem that the existing sewage treatment facilities cannot operate normally in winter, improves the treatment efficiency, especially improves the nitrogen removal and phosphorus removal effect, and greatly improves the environmental quality.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment, and in particular to a plateau low-temperature sewage treatment device and a treatment method. Background Art

[0002] With the deepening of the western development strategy, the western plateau region is experiencing large-scale development and construction, ushering in unprecedented development opportunities. But at the same time, the opening of the Qinghai-Tibet Railway, the influx of population, factory construction, road and bridge engineering and other human activities have brought considerable pressure to the local environment. The pollution of water sources in the plateau region by domestic and industrial sewage generated in the process cannot be ignored. The environmental capacity of the plateau region is small, and the self-purification capacity of rivers and lakes is poor. Once the water body is polluted, it is difficult to recover. Sewage treatment facilities and equipment are artificial intensive treatment sites that all kinds of sewage must go through before being discharged into the natural environment. Whether they operate normally is directly related to the final results of water pollution control, and they play a vital role in the protection of the water environment of rivers and lakes in the plateau region.

[0003] The high-altitude and cold areas mainly include Qinghai Province, southwestern Sichuan Province, western Yunnan Province and Tibet Autonomous Region. Compared with the plains in eastern my country, they have the characteristics of high altitude, low air pressure and low oxygen content in the air. The average altitude of some cities in these areas is above 2,200m, and some cities even reach above 3,000m. Due to the high altitude, low air pressure, large temperature difference and low annual average temperature, the construction of sewage treatment plants in these areas has special requirements for sewage treatment technology. According to relevant surveys, the sewage treatment plants built in southwestern Sichuan Province (Aba, Ganzi and Liangshan Prefectures) basically cannot operate normally in winter.

[0004] At present, the research on low-temperature sewage treatment technology mainly focuses on process improvement and low-temperature bacteria culture. A small part of the research mentions underground insulation assistance. Due to the limitation of energy utilization and cost, there are no research reports on heating and heating low-temperature sewage. There are even fewer studies on sewage treatment technology in plateau low-temperature environments. Generally, the research focuses on improving the insufficient oxygen supply in the plateau and increasing the aeration intensity. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a plateau low-temperature sewage treatment device and treatment method, so as to overcome the problem that the existing sewage treatment facilities cannot operate normally in winter, improve the treatment efficiency, especially enhance the nitrogen removal and phosphorus removal effects, and greatly improve the environmental quality.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a plateau low-temperature sewage treatment device, comprising a regulating tank, an anaerobic tank, an aerobic tank and a disinfection tank arranged in sequence; the regulating tank is provided with a water inlet, and the regulating tank is also provided with a sludge return port for returning the sludge in the rear stage; the anaerobic tank is provided with a fender, the aerobic tank is provided with a lamp-tube type intubation obliquely, and the disinfection tank is provided with a water outlet; a microporous aeration head is provided at the outlet end of the lamp-tube type intubation, and the microporous aeration head is connected to the aeration pipe; a sludge outlet is provided below the regulating tank, the anaerobic tank and the aerobic tank; a transmission belt is provided below the aerobic tank, a heater is provided below the transmission belt, and an insulating and heat-preserving layer is provided below the heater; the specific structure of the lamp-tube type intubation is: a spherical carrier is fixed at a certain distance in the tube wall of the lamp-tube type intubation, and the spherical carrier includes a fixing ring fixed to the tube wall, a spherical carrier frame connected to the fixing ring, and a filler inside the spherical carrier frame.

[0007] Furthermore, both ends of the lamp tube type insert are rotatable connectors.

[0008] Furthermore, the heater is connected to a battery, and the battery, controller and solar panel are connected in sequence.

[0009] The treatment method according to the above plateau low-temperature sewage treatment device comprises the following steps:

[0010] Step 1: The plateau low-temperature sewage enters the regulating tank through the external grille to adjust the water quality and quantity, and the particulate pollutants that are left standing are discharged from the bottom sludge outlet;

[0011] Step 2: The sewage flows into the anaerobic tank after passing through the regulating tank. At the same time, the sewage from the rear section flows into the anaerobic tank through the sludge return port. Phosphorus is removed by the reaction of phosphorus-releasing bacteria under the anaerobic environment, and the remaining sludge containing phosphorus is discharged from the bottom;

[0012] Step 3: The sewage then flows into the aerobic pool, where it is heated by the bottom heating and aerated in the lamp-tube intubation of the aerobic pool to remove organic matter. The intubation aeration divides the entire aerobic pool into an aerobic zone and an anoxic zone, and denitrification is carried out under the assistance of suitable water temperature conditions. The lamp-tube intubation oblique tube sedimentation is used to precipitate a portion of the excess sludge or dead sludge that cannot be gathered in the spherical carrier. At the same time, the oblique tube in the middle of the aerobic pool is isolated, and the supernatant is discharged and the bottom sludge is discharged;

[0013] Step 4: The supernatant effluent from the aerobic tank is discharged into the disinfection tank and then discharged after disinfection.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The plateau low-temperature device of the present invention makes the treatment of low-temperature sewage in the plateau in winter technically feasible, and the equipment greatly improves the treatment effect.

[0016] 2. The replaceable lamp-tube intubation tube is convenient for management and maintenance, and can also form a local anoxic and aerobic environment to improve the treatment effect.

[0017] 3. The inclined tube sedimentation structure facilitates the discharge of residual sludge and improves the efficiency of aeration, allowing full contact between air and water.

[0018] 4. The combination of improved AO process with selectable granular sludge and local anoxic environment was proposed to improve the denitrification effect in a low-carbon source environment.

[0019] 5. It proposes to use new energy to heat low-temperature plateau sewage, which improves the overall sewage treatment effect in low-temperature environments. The design structure of DC heating and aeration improves the durability of the equipment and saves energy.

[0020] 6. Highly integrated equipment facilitates construction and management operations in plateau areas, and saves construction costs and subsequent operating expenses. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the plateau low-temperature sewage treatment device of the present invention.

[0022] Figure 2 It is a top view of the lamp tube type insert pipe in the present invention.

[0023] Figure 3 It is a side view of the lamp tube type intubation tube in the present invention.

[0024] Figure 4 It is a schematic diagram of the spherical carrier in the lamp tube type intubation of the present invention.

[0025] Figure 5 It is a schematic diagram of the new energy heating structure in the present invention.

[0026] Figure 6 The present invention is a flow chart of the plateau low-temperature sewage treatment method.

[0027] In the figure: water inlet 1; water outlet 2; sludge return port 3; mud guard 4; lamp tube type intubation 5; regulating tank 6; anaerobic tank 7; microporous aeration head 8; aeration pipe 9; sludge outlet 10; disinfection tank 11; aerobic tank 12; spherical carrier 13; rotatable connecting part 14; pipe wall 15; transmission belt 16; heater 17; insulation layer 18; battery 19; controller 20; solar panel 21; fixing ring 131; spherical carrier frame 132; filler 133. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The sewage treatment device provided in the present invention can be called an AICO reactor (Anaerobic Internal Circulation Oxic), which adds an anaerobic + aerobic internal circulation process, that is, a modified AO process flow, adding an aerobic internal circulation stage to the traditional AO process; the AO process, that is, the anaerobic aerobic process, A (Anaerobic) is the anaerobic section, used for phosphorus removal, and O (Oxic) is the aerobic section, used to remove organic matter in water.

[0029] The present invention discloses a plateau low-temperature sewage treatment device, which has the following structure: it comprises a regulating tank 6, an anaerobic tank 7, an aerobic tank 12 and a disinfection tank 11 which are arranged in sequence; the regulating tank 6 is provided with a water inlet 1, and the regulating tank 6 is also provided with a sludge return port 3 for returning the sludge in the rear section; the anaerobic tank 7 is provided with a fender 4, the aerobic tank 12 is provided with a lamp tube type insert pipe 5 which is obliquely arranged, and the disinfection tank 11 is provided with a water outlet 2; a microporous aeration head 8 is provided at the outlet end of the lamp tube type insert pipe 5, and the microporous aeration head 8 is connected to an aeration pipe 9; Both the oxygen pool 7 and the aerobic pool 12 have sludge outlets 10 below; a transmission belt 16 is provided below the aerobic pool 12, a heater 17 is provided below the transmission belt 16, and an insulating layer 18 is provided below the heater 17; the specific structure of the lamp tube type intubation 5 is as follows: spherical carriers 13 are fixed at a certain interval in the tube wall 15 of the lamp tube type intubation 5, and the spherical carriers 13 include a fixing ring 131 fixed to the tube wall 15, a spherical carrier frame 132 connected to the fixing ring 131, and a filler 133 inside the spherical carrier frame 132.

[0030] As a usage optimization, both ends of the lamp tube type insert 5 are rotatable connectors 14 .

[0031] As another optimization, the heater 17 is connected to the battery 19, and the battery 19, the controller 20 and the solar panel 21 are connected in sequence.

[0032] According to the treatment method of the plateau low-temperature sewage treatment device, specifically: when the equipment has been successfully debugged and there is granular sludge, firstly, the low-temperature sewage (plateau domestic sewage, 8~12℃) enters the regulating tank 6 through the external grille to adjust the water quality and quantity, and the large particle pollutants that are left standing are discharged from the bottom sludge outlet 10; the sewage flows into the A tank (anaerobic tank 7) after passing through the regulating tank, and at the same time, the back-flow sewage / sludge also flows into the A tank through the sludge return port 3, and phosphorus is removed by the reaction of phosphorus-releasing bacteria under anaerobic environment, and the residual sludge containing phosphorus is discharged from the bottom; then the sewage slowly flows into the O tank (aerobic tank 12), and passes through the high-efficiency heater at the bottom. 17 is heated to a temperature of about 10°C (the maximum sewage temperature is controlled at 29°C), and at the same time, aeration is performed in the lamp-tube intubation 5 of the O pool to remove organic matter. The intubation aeration divides the entire O pool into an aerobic zone (inside the intubation) and an anoxic zone (outside the intubation). With the assistance of suitable water temperature conditions, denitrification reaction (denitrification) can be effectively carried out; through the oblique tube sedimentation principle, a small part of the remaining sludge (or dead sludge) that cannot be gathered in the spherical carrier 13 can be precipitated. At the same time, because of the isolation of the oblique tube in the middle of the O pool, the mud and water are better separated, and it has the effect of a sedimentation tank, the supernatant is discharged, and the bottom sludge is discharged; the supernatant effluent of the O pool is discharged into the disinfection pool 11 and discharged after disinfection.

[0033] The technical effects of the method of the present invention are described below by means of specific examples.

[0034] Mixed sewage was obtained from the underground sewage pipe of a sewage treatment station in a town in Jiulong County, Ganzi Prefecture, Sichuan Province (about 3000m above sea level), and the water temperature in the pipe was about 10.8℃. The pollutant content COD (chemical oxygen demand) was 220mg / L, BOD5 (biochemical oxygen demand in five days) was 75mg / L, ammonia nitrogen concentration was 31mg / L, total phosphorus concentration was 3.6mg / L, and SS (suspended solids) was 110mg / L.

[0035] The method of the present invention is used to conduct experiments. First, sewage is connected to the AICO reactor, and water is continuously introduced. It flows into the A tank through the regulating tank and then into the O tank. The supernatant after treatment is discharged into the disinfection tank, and the residual sludge at the bottom of the regulating tank, A tank, and O tank is discharged. The details are as follows:

[0036] 1) Regulating tank 6, with water entering from the top and mud discharged from the bottom, with a retention time of 4 hours, to regulate water quality and quantity.

[0037] 2) Pool A (anaerobic pool 7), water enters from the top, sludge is discharged from the bottom, the retention time is 2 hours, and phosphorus is released quickly and the sludge is discharged.

[0038] 3) O tank (aerobic tank 12), aerobic internal circulation tank, residence time 16 hours, aerobic environment inside the lamp-tube intubation 5, anoxic environment outside the lamp-tube intubation 5, microporous aeration inside the intubation, inclined tube sedimentation and sludge discharge, full use of space, shortened process flow, full contact between air and water, better separation of mud and water. Adjust the reflux ratio according to the influent concentration, discharge the excess residual sludge, and the supernatant flows out from the top.

[0039] 4) O pool (aerobic pool 12), at the bottom of the sludge discharge, is equipped with a high-efficiency heating device to increase the temperature and efficiency of the denitrification reaction, while also raising the water temperature in the entire O pool to enhance the activity of various microorganisms. The local water temperature is controlled within 28°C.

[0040] 5) O tank (aerobic tank 12), in the lamp tube type intubation 5, a spherical carrier 13 is arranged to solidify the formation and stability of granular sludge; microporous aeration combined with the oblique tube intubation structure optimizes the aeration efficiency, has a certain selectivity for granular sludge, and enhances the removal effect of organic matter.

[0041] 6) Disinfection tank 11, residence time 0.5~1 hour, discharge after disinfection reaction.

[0042] The above specific values ​​are for reference only and should be debugged and adjusted according to actual conditions.

[0043] After the device is stabilized, the effluent can stably meet the Level A standard of "Pollutant Discharge Standard for Urban Wastewater Treatment Plants" GB18918-2002. The effluent monitoring results are: pollutant content COD (chemical oxygen demand) is 17.0 mg / L, BOD5 (five-day biochemical oxygen demand) is 4.5 mg / L, ammonia nitrogen concentration is 1.6 mg / L, total phosphorus concentration is 0.35 mg / L, SS (suspended solids) is 6.0 mg / L.

[0044] Among them, the measurement method of SS adopts the weight method of GB11901-89, the measurement method of COD value adopts the potassium dichromate method of HJ 828-2017, the measurement method of BOD5 value adopts the dilution and inoculation method of HJ 505-2009, the measurement method of ammonia nitrogen adopts the Nessler reagent spectrophotometry of HJ 535-2009, and the monitoring method of total phosphorus adopts the ammonium molybdate spectrophotometry of GB 11893-89.

Claims

1. A plateau low-temperature sewage treatment device, characterized in that: The invention comprises a regulating tank (6), an anaerobic tank (7), an aerobic tank (12) and a disinfection tank (11) which are arranged in sequence; the regulating tank (6) is provided with a water inlet (1), and the regulating tank (6) is also provided with a sludge return port (3) for returning the sludge at the rear stage; the anaerobic tank (7) is provided with a fender (4), the aerobic tank (12) is provided with a lamp-type insert pipe (5) with an inlet end at the top and an outlet end at the bottom, and the disinfection tank (11) is provided with a water outlet (2); a microporous aeration head (8) is provided at the outlet end of the lamp-type insert pipe (5), and the microporous aeration head (8) is connected to an aeration pipe (9); and sludge outlets (10) are provided below the regulating tank (6), the anaerobic tank (7) and the aerobic tank (12); A transmission belt (16) is provided below the aerobic pool (12), a heater (17) is provided below the transmission belt (16), and an insulating layer (18) is provided below the heater (17); The specific structure of the lamp tube type intubation tube (5) is as follows: spherical carriers (13) are fixed at a certain interval in the tube wall (15) of the lamp tube type intubation tube (5), and the spherical carriers (13) include a fixing ring (131) fixed to the tube wall (15), a spherical carrier frame (132) connected to the fixing ring (131), and a filler (133) inside the spherical carrier frame (132); Both ends of the lamp tube-type insert (5) are rotatable connectors (14); The heater (17) is connected to a storage battery (19), and the storage battery (19), a controller (20) and a solar panel (21) are connected in sequence.

2. A treatment method according to the plateau low-temperature sewage treatment device of claim 1, characterized in that: The method comprises the following steps: Step 1: the plateau low-temperature sewage is passed through an external grille into a regulating tank (6), the water quality and quantity are regulated, and the particulate pollutants that are left standing are discharged from a bottom sludge outlet (10); Step 2: The sewage flows into the anaerobic tank (7) after passing through the regulating tank (6), and the return sewage from the rear section flows into the anaerobic tank (7) through the sludge return port (3), and phosphorus is removed by the reaction of phosphorus-releasing bacteria under the anaerobic environment, and the remaining sludge containing phosphorus is discharged from the bottom; Step 3: The sewage then flows into the aerobic tank (12), is heated by the bottom heater (17), and is aerated in the lamp-tube insert (5) of the aerobic tank (12) to remove organic matter. The insert aeration divides the entire aerobic tank (12) into an aerobic zone and an anoxic zone, and denitrification reaction is carried out under the assistance of suitable water temperature conditions; a portion of the excess sludge or dead sludge that cannot be gathered in the spherical carrier (13) is precipitated through the lamp-tube insert (5) oblique tube sedimentation, and at the same time, the middle oblique tube of the aerobic tank (12) is isolated, and the supernatant is discharged and the bottom sludge is discharged; Step 4: The supernatant effluent from the aerobic tank (12) is discharged into the disinfection tank (11) and discharged after being disinfected.

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