Intelligent modular integrated treatment equipment for cold region high-speed service area domestic sewage

Abstract

The application discloses an intelligent modular integrated treatment equipment for domestic sewage in a cold region high-speed service area, and relates to a sewage treatment equipment.The technical problem of poor operation efficiency of the existing sewage treatment equipment in a cold region high-speed service area is solved.The treatment equipment comprises a sewage treatment main device, a monitoring controller system and a heat preservation system; the sewage treatment main device is sequentially divided into a water inlet mixing area, an anaerobic area, a low DO aeration area, a high DO aeration area, an MBR membrane area, a clean water pool and an equipment room from left to right; the equipment room is provided with a water inlet submersible pump, a self-priming pump, a backwashing pump, a sludge backflow pump, an aeration fan and the monitoring controller system; and the heat preservation system is a polyurethane heat preservation material layer outside a box body, and a circulating water heating pipe is laid in the layer.The sewage is introduced into the treatment equipment inoculated with residual sludge to start, and then the sewage to be treated is introduced into the treatment equipment to operate.The effluent water quality meets the first level A standard, and the treatment equipment can be used in the field of low-temperature domestic sewage treatment in a cold region.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, specifically to an intelligent modular integrated equipment that combines a combined aeration and biologically enhanced MBR process for the efficient treatment of domestic wastewater from highway service areas in cold regions. Background Technology

[0002] With the continuous construction and development of highways and the further transformation of the transportation industry, highway service areas and their ancillary facilities, as an important part of compensation, provide safe catering, shopping, rest, entertainment, public toilets, accommodation, cleaning, and maintenance services, thereby ensuring the safe operation of vehicles. However, this also generates a large amount of wastewater. The polluted areas of highway service areas can be roughly divided into three categories: domestic pollution areas, washing pollution areas, and surface pollution areas. The wastewater generated from these three types of pollution areas consists of domestic sewage, washing wastewater, and surface wastewater.

[0003] Most highway service areas in cold regions have built or are already using sewage treatment facilities, but some problems still exist, such as: (1) Due to the low winter temperatures in cold regions, for example, the winter temperature in Northeast my country is often below -20℃ and the winter lasts for a long time. Conventional biochemical treatment technology is limited by low temperatures, resulting in a large deviation between the actual treatment capacity and the designed treatment capacity. (2) The design and scale of sewage treatment equipment are unreasonable. As traffic flow varies with time, the fluctuation of sewage discharge is relatively large. The discharge of pollutants in the effluent does not meet the national discharge standards, which seriously affects the sewage treatment effect and has an adverse impact on the surrounding environment of the service area. (3) Lack of professional management and maintenance, and inadequate operation supervision. Since the sewage treatment process in service areas is mostly complex, it is difficult for non-professionals to manage it. Moreover, its poor geographical location makes it difficult to invite relevant professionals, resulting in a lack of professional management and maintenance. The operation status of sewage treatment facilities is difficult to be supervised, resulting in poor sewage treatment effect. Therefore, the search for efficient, energy-saving, and easy-to-operate wastewater treatment equipment and processes for highway service areas in cold regions has become an urgent need. By reducing the impact of pollutants on receiving water bodies, low-carbon treatment and compliant discharge of domestic sewage in cold regions can be achieved. Summary of the Invention

[0004] This invention aims to solve the technical problem of poor operating efficiency of existing sewage treatment equipment in highway service areas in cold regions, and provides an intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions. This equipment is an independent, efficient and economical sewage treatment system based on a diversified process of "combined aeration composite biological enhanced MBR". While effectively reducing investment costs, it meets the treatment needs of domestic sewage in service areas and achieves effective treatment and compliant discharge of sewage.

[0005] The intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions of the present invention includes a main sewage treatment unit, a monitoring and control system, and a heat preservation system.

[0006] The main sewage treatment unit is a cuboid, and from left to right it is divided into an influent mixing zone 1, an anaerobic zone 2, a low DO aeration zone 3, a high DO aeration zone 4, an MBR membrane zone 5, a clear water tank 6, and an equipment room 7.

[0007] The influent mixing zone 1 and the anaerobic zone 2, and the anaerobic zone 2 and the low DO aeration zone 3 are separated by overflow baffles.

[0008] Low DO aeration zone 3 is adjacent to high DO aeration zone 4 and clear water tank 6; low DO aeration zone 3 and high DO aeration zone 4 are separated by a perforated guide wall; low DO aeration zone 3 and clear water tank 6 are separated by a non-perforated partition; high DO aeration zone 4 and clear water tank 6 are separated by a non-perforated partition; high DO aeration zone 4 and MBR membrane zone 5 are separated by an overflow partition.

[0009] A stirrer 2-1 is installed in anaerobic zone 2; the stirrer 2-1 provides stirring for the anaerobic zone, so that the sludge and microorganisms in the anaerobic zone are in a suspended state.

[0010] The bottom of the low DO aeration zone 3 is equipped with a first aeration disc 3-1, and the filler 3-2 added to the low DO aeration zone 3 is an elastic filler or a polypropylene multi-faceted hollow ball filler; the bottom of the high DO aeration zone 4 is equipped with a second aeration disc 4-1, and spherical plastic filler 4-2 is added to the high DO aeration zone 4; suspended filler is added to the aerobic zone to provide a space niche for microbial attachment, increase the microbial concentration, and enhance the biochemical treatment of the aerobic zone to achieve the purpose of biofortification;

[0011] Overflow outlet at the top of clear water tank 6;

[0012] Equipment room 7 is equipped with an inlet submersible pump 8, a self-priming pump 9, a backwash pump 10, a sludge return pump 11, an aeration blower 12, and a monitoring and control system 13;

[0013] An inlet is provided at the lower end of the side wall of the water mixing zone 1; the outlet pipe of the submersible water pump 8 is connected to the water mixing zone 1;

[0014] Hollow fiber membrane module 5-1 is fixed in the MBR membrane zone 5; polypropylene multifaceted hollow sphere packing 5-2 is added in the MBR membrane zone 5, which is beneficial to the growth and reproduction of microorganisms, and the packing can further reduce membrane fouling by scouring the MBR membrane surface; perforated aerators 5-3 are evenly arranged at the bottom of the MBR membrane zone 5.

[0015] The bottom of the MBR membrane zone 5 is provided with a return liquid outlet and is connected to the sludge return pump 11. The sludge return pump 11 is then connected to the anaerobic zone 2 and the low DO aeration zone 3 through a four-way valve. The other outlet of the four-way valve is used for sludge discharge.

[0016] Hollow fiber membrane module 5-1 is connected to the inlet of self-priming pump 9, and the outlet of self-priming pump 9 is connected to clear water tank 6; water is drawn from hollow fiber membrane module 5-1 by self-priming pump 9 and transported to clear water tank 6; at the same time, the inlet of backwash pump 10 is connected to clear water tank 6, and the outlet of backwash pump 10 is connected to hollow fiber membrane module 5-1; backwash pump 10 is used to backwash the hollow fiber membrane in MBR membrane tank;

[0017] The first aeration disc 3-1 is connected to the aeration fan 12 via the first gas flow meter, the second aeration disc 4-1 is connected to the aeration fan 12 via the second gas flow meter, and the perforated aerator 5-3 is connected to the aeration fan 12 via the third gas flow meter; air is pumped into the aeration device at regular intervals and in a quantitative manner to maintain the dissolved oxygen in the device within a constant range; the optimized layout structure enables full-area aeration dissolved oxygen regulation;

[0018] The monitoring and control system 13 consists of an online monitoring system and a PLC equipment control system;

[0019] Online monitoring probe channels are installed at the top of each of the following zones: anaerobic zone 2, low-DO aeration zone 3, high-DO aeration zone 4, and MBR membrane zone 5. The online monitoring parameters for anaerobic zone 2 are dissolved oxygen, pH, chemical oxygen demand (COD), ammonia nitrogen, and total phosphorus; for low-DO aeration zone 3, dissolved oxygen and pH; for high-DO aeration zone 4, dissolved oxygen and pH; and for clear water tank 6, COD, ammonia nitrogen, and total phosphorus. The data from these online monitoring parameters are all displayed in the monitoring and control system.

[0020] The agitator 2-1, the inlet submersible pump 8, the self-priming pump 9, the backwash pump 10, the sludge return pump 11, and the aeration blower 12 are connected to the PLC equipment control system. The speed of the agitator 2-1, the start and stop of the inlet submersible pump 8, the self-priming pump 9, the backwash pump 10, the sludge return pump 11, and the aeration blower 12 are controlled according to the indicators of the online monitoring system.

[0021] The insulation system consists of a polyurethane insulation layer wrapped around the outer surface of the integrated unit's enclosure, with circulating water heating pipes laid within this layer. In winter, hot water is supplied to the circulating water heating pipes, and heat exchange is used to maintain the enclosure's temperature. Waste heat from winter heating can be used as a source of hot water.

[0022] Furthermore, the top of the integrated device body is provided with an inspection port and an exhaust port, and a one-way valve is installed on the exhaust port. A detection port is provided at the bottom front side of the integrated device body, and the detection port is opened and closed by a valve.

[0023] Furthermore, the aeration tube of the perforated aerator is a flexible hose; the flexible hose provides linear aeration, ensuring uniform air distribution and forming a vertical circulation, resulting in more uniform mixing. The aeration hose produces smaller bubbles, leading to higher oxygen utilization and power efficiency. Different design modes of the aeration tube can be used to adjust the working pressure, and different distances and densities can alter the working efficiency of the aerator. The aeration device utilizes gas disturbance and mutual friction between air bubbles and the separation membrane to reduce MBR membrane fouling.

[0024] Furthermore, a disc filter is installed in the inlet mixing zone 1 to trap large particles;

[0025] Furthermore, the first aeration disc 3-1 in the low-DO aeration zone 3 and the second aeration disc 4-1 in the high-DO aeration zone 4 employ microporous aeration for continuous or intermittent aeration. The aeration discs arranged at the bottom of the device further reduce the dead zone in the aerobic area, increase the oxygen mass transfer rate, and allow for adjustment of the aeration rate according to different process requirements. This effectively controls the dissolved oxygen concentration and facilitates the successful implementation of microbial short-cut nitrification / denitrification and anoxic denitrification.

[0026] Furthermore, an oxygen release device and / or an oxygen deoxygenation zone are installed between the reflux outlet at the bottom of the MBR membrane zone 5 and the sludge return pump 11 to reduce the dissolved oxygen concentration in the reflux.

[0027] Furthermore, a disc filter is installed at the inlet of the influent mixing zone 1 to intercept fine, fibrous suspended solids at the source, thereby reducing damage to the main wastewater treatment unit caused by suspended solids.

[0028] Furthermore, the return liquid pipe of anaerobic zone 2 adopts a multi-pipe water distribution method based on a central disc, with the output end extending to the bottom of the anaerobic zone, so as to achieve uniform mixing of influent and return liquid and improve the shock load resistance of the integrated equipment.

[0029] The method of using the intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions according to the present invention is as follows:

[0030] I. Start-up of the device:

[0031] The anaerobic zone 2, low-DO aeration zone 3, and high-DO aeration zone 4 of the intelligent modular integrated treatment equipment for domestic sewage from highway service areas in cold regions are inoculated with excess sludge from a municipal sewage treatment plant. The domestic sewage to be treated is then diluted to a COD concentration of 300–400 mg / L and pumped into the influent mixing zone 1 through the inlet using an inlet submersible pump 8. The domestic sewage sequentially passes through the anaerobic zone 2, low-DO aeration zone 3, and high-DO aeration zone 4 before entering the MBR membrane zone 5. It is then pumped from the hollow fiber membrane by a self-priming pump 9. Water is drawn out from membrane module 5-1 and transported to clear water tank 6. A portion of the wastewater and sludge from MBR membrane zone 5 is returned to influent mixing zone 1 and low DO aeration zone 3 via return pipe using sludge return pump 11 for the next cycle. The remaining sludge is discharged through another outlet via a four-way valve. The process operating parameters are as follows: the dosage ratio of elastic packing material 3-2 in low DO aeration zone 3 is 15%–30%; the dosage ratio of spherical plastic packing material 4-2 in high DO aeration zone 4 is 15%–30%. 0%; the dosage of polypropylene multifaceted hollow sphere packing 5-2 in MBR membrane zone 5 is 5%–10%; hydraulic retention time (HRT) is 20h, MLSS is 6000–8000 mg / L, reflux ratio is 100%, dissolved oxygen in low DO aeration zone 3 is 0.3–0.5 mg / L, dissolved oxygen in high DO aeration zone 4 is 2–2.2 mg / L, dissolved oxygen in MBR membrane zone 5 is 2–2.2 mg / L, record the changes in influent and effluent COD, when the effluent COD reaches the specified level... When the OD removal rate reaches over 80%, the influent COD concentration is gradually increased to 800-1000 mg / L and operated under the same process operating parameters. When the effluent COD removal rate reaches over 80%, the start-up is successful. In this step, the biological process start-up adopts the synchronous inoculation acclimatization method, with a fixed residence time. The raw wastewater with a lower concentration is introduced into the reactor that has been inoculated with seed sludge. After 80% of the degradable COD is removed, the organic load is increased, and the organic load is gradually increased until the design requirements are met.

[0032] II. Stable operation of the equipment:

[0033] The domestic sewage to be treated is pumped into the influent mixing zone 1 through the inlet using the submersible pump 8. Larger impurities are removed by the filter discs. The overflow then enters the anaerobic zone 2, where it is mixed and anaerobic nitrified under agitation at 50 rpm. The sewage then overflows sequentially into the low-DO aeration zone 3 and the high-DO aeration zone 4, before entering the MBR membrane zone 5. A self-priming pump 9 draws water from the hollow fiber membrane module 5-1 and transports it to the clear water tank 6, from where it is discharged through the outlet. A sludge return pump 11 returns a portion of the sewage and sludge from the MBR membrane zone 5 back to the influent mixing zone 1 and the low-DO aeration zone 3 for the next cycle. The remaining sludge is discharged through a four-way valve. Each outlet discharges water periodically. During the treatment process, the hydraulic retention time (HRT) is controlled at 20–24 h, MLSS at 6000–8000 mg / L, and the reflux ratio at 100–110%. The dissolved oxygen in the low DO aeration zone 3 is 0.3–0.5 mg / L, the dissolved oxygen in the high DO aeration zone 4 is 1–2.5 mg / L, and the dissolved oxygen in the MBR membrane zone 5 is 1–2.5 mg / L. After every 8 minutes of operation, the influent submersible pump 8, the self-priming pump 9, and the sludge return pump 11 are shut off, and the backwash pump 10 is turned on and run for 2 minutes to input clean water from the clear water tank into the MBR membrane reaction zone to backwash the hollow fiber membrane module 5-1. The backwash water intensity is 10 L·m. -2 ·s -1 Complete the treatment of domestic sewage from highway service areas in cold regions.

[0034] This invention replaces the secondary sedimentation tank at the end of traditional biological treatment technology with an MBR (Membrane Bioreactor). It maintains a high concentration of activated sludge within the bioreactor, increasing the organic load of biological treatment and thus reducing the footprint of wastewater treatment facilities. Furthermore, it reduces the amount of excess sludge by maintaining a low sludge load. The main method utilizes membrane separation equipment immersed in an aerobic biological tank to trap activated sludge and macromolecular organic matter in the tank. The activated sludge concentration (MLSS) within the membrane bioreactor system can be increased to 8000-10000 mg / L, or even higher; the sludge retention time (SRT) can be extended to over 30 days. This is beneficial for treating domestic wastewater from highway service areas in cold regions.

[0035] In the treatment equipment of this invention, each independent treatment device can be freely assembled and combined. Compared with similar products or other process processors, it is more energy-efficient, has lower operating costs, and requires less site space. It can be flexibly constructed in areas with large fluctuations in water quality and quantity, such as cold regions, low temperatures, and high-speed service areas. The investment is low, and the overall cost is lower than that of other process wastewater treatment plants. At the same time, the equipment is equipped with multiple remote transmission devices, which can perform fully automatic operation and remote monitoring via mobile client. It has a high degree of automation and high impact resistance.

[0036] This invention employs a combined aeration zone and an MBR membrane separation zone with different aeration coupling controls to enhance nitrogen and phosphorus removal in wastewater within a limited volume. This results in more stable system operation under higher shock loads and also reduces heat dissipation area, ensuring a favorable environment for microbial growth. The intelligent modular integrated equipment of this invention integrates multiple combined aeration methods, bioaugmentation, and MBR technology, forming a comprehensive dissolved oxygen aeration system.

[0037] The integrated sewage treatment equipment of this invention adopts an online monitoring and equipment control system, which can further remotely control the sewage treatment in service areas. It can be used in the field of domestic sewage treatment in highway service areas in cold regions. It has a small footprint, is resistant to low temperatures, and has good treatment effect.

[0038] The integrated wastewater treatment equipment of this invention integrates modified AO, biological enhancement, and combined aeration MBR processes. It is designed for the low temperature characteristics of domestic sewage in cold regions, and has good nitrogen and phosphorus removal effects. The effluent quality meets the Class A standard and can be used for the treatment of low-temperature domestic sewage in cold regions. Attached Figure Description

[0039] Figure 1 This is a top view schematic diagram of the intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions according to the present invention.

[0040] Figure 2 yes Figure 1 Schematic diagram of the AA section structure.

[0041] In the diagram: 1 is the influent mixing zone, 2 is the anaerobic zone, 2-1 is the agitator, 3 is the low DO aeration zone, 3-1 is the first aeration disc, 4 is the high DO aeration zone, 4-1 is the second aeration disc, 5 is the MBR membrane zone, 5-1 is the hollow fiber membrane module, 5-2 is the polypropylene multi-faceted hollow sphere packing, 5-3 is the perforated aerator, 6 is the clear water tank, 7 is the equipment room; 8 is the influent submersible pump, 9 is the self-priming pump, 10 is the backwash pump, 11 is the sludge return pump, 12 is the aeration blower, and 13 is the monitoring and control system. Detailed Implementation

[0042] The beneficial effects of the present invention will be verified using the following examples.

[0043] Example 1: The intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions in this example consists of a main sewage treatment unit, a monitoring and control system, and a heat preservation system;

[0044] The main sewage treatment unit is a steel cuboid measuring 6m × 1.5m × 2.5m. From left to right, the main sewage treatment unit is divided into an influent mixing zone 1, an anaerobic zone 2, a low DO aeration zone 3, a high DO aeration zone 4, an MBR membrane zone 5, a clear water tank 6, and an equipment room 7.

[0045] The influent mixing zone 1 is separated from the anaerobic zone 2, and the anaerobic zone 2 is separated from the low DO aeration zone 3 by overflow baffles; the low DO aeration zone 3 is adjacent to the high DO aeration zone 4 and the clear water tank 6; the low DO aeration zone 3 and the high DO aeration zone 4 are separated by perforated guide walls; the low DO aeration zone 3 and the clear water tank 6 are separated by non-perforated baffles; the high DO aeration zone 4 and the clear water tank 6 are separated by non-perforated baffles; the high DO aeration zone 4 and the MBR membrane zone 5 are separated by overflow baffles; the effective volume of the anaerobic zone 2 is 2.2 m³. 3 The effective volume of low DO aeration zone 3 is 4.4 m³. 3 The effective volume of the high DO aeration zone 4 is 4.2 m³. 3 The effective volume of MBR membrane section 5 is 4.2 m³. 3 ;

[0046] A stirrer 2-1 is installed in anaerobic zone 2; the stirrer 2-1 provides stirring for the anaerobic zone, so that the sludge and microorganisms in the anaerobic zone are in a suspended state.

[0047] The bottom of the low DO aeration zone 3 is equipped with a first aeration disc 3-1, and elastic packing material 3-2 is added to the low DO aeration zone 3; the bottom of the high DO aeration zone 4 is equipped with a second aeration disc 4-1, and spherical plastic packing material 4-2 is added to the high DO aeration zone 4; suspended packing material is added to the aerobic zone to enhance the biochemical treatment of the aerobic zone and achieve the purpose of bio-enhancement.

[0048] The upper end of the clear water tank 6 is equipped with an overflow outlet;

[0049] Equipment room 7 is equipped with an inlet submersible pump 8, a self-priming pump 9, a backwash pump 10, a sludge return pump 11, an aeration blower 12, and a monitoring and control system 13;

[0050] An inlet is provided at the lower end of the side wall of the inlet mixing zone 1; the outlet pipe of the inlet submersible pump 8 is connected to the bottom of the inlet mixing zone 1, and a disc filter is provided at the inlet of the inlet mixing zone 1 to intercept large particles, so as to intercept fine and fibrous suspended solids from the source and reduce the damage of suspended solids to the main sewage treatment device.

[0051] Hollow fiber membrane module 5-1 is fixed in the MBR membrane zone 5. The hollow fiber membrane module 5-1 is a PVDF hollow fiber ultrafiltration membrane module. Polypropylene multifaceted hollow sphere packing 5-2 is added in the MBR membrane zone 5, which is beneficial to the growth and reproduction of microorganisms. Perforated aerators 5-3 are evenly arranged at the bottom of the MBR membrane zone 5.

[0052] The bottom of the MBR membrane zone 5 is equipped with a return liquid outlet and is connected to the sludge return pump 11. The sludge return pump 11 is then connected to the anaerobic zone 2 and the low DO aeration zone 3 via a four-way valve. The other outlet of the four-way valve is used for sludge discharge. The return liquid pipe of the anaerobic zone 2 adopts a multi-pipe water distribution method based on a central disc, with the output end extending to the bottom of the anaerobic zone to achieve uniform mixing of influent and return liquid and improve the shock load resistance of the integrated equipment.

[0053] Hollow fiber membrane module 5-1 is connected to the inlet of self-priming pump 9, and the outlet of self-priming pump 9 is connected to clear water tank 6. Water is drawn from hollow fiber membrane module 5-1 by self-priming pump 9 and transported to clear water tank 6. At the same time, the inlet of backwash pump 10 is connected to clear water tank 6, and the outlet of backwash pump 10 is connected to hollow fiber membrane module 5-1. Backwash pump 10 is used to backwash the hollow fiber membrane in MBR membrane tank, and the backwash water is returned to clear water tank 6 for circulation.

[0054] The first aeration disc 3-1 is connected to the aeration fan 12 via a first gas flow meter; the second aeration disc 4-1 is connected to the aeration fan 12 via a second gas flow meter; and the perforated aerator 5-3 is connected to the aeration fan 12 via a third gas flow meter. The first and second aeration discs 3-1 and 4-1 employ microporous aeration. The aeration discs arranged at the bottom of the device further reduce the dead zone in the aerobic area, increase the oxygen mass transfer rate, and allow for adjustment of the aeration rate according to different process requirements. This effectively controls the dissolved oxygen concentration and smoothly achieves microbial short-cut nitrification / denitrification and anoxic denitrification nitrogen removal. The perforated aeration... The aeration pipe of device 5-1 is a flexible hose; the flexible hose provides linear aeration, ensuring uniform air distribution and forming a vertical circulation, resulting in more uniform mixing. The aeration hose produces small bubbles, leading to high oxygen utilization and power efficiency. Different design modes of the aeration pipe can be used to adjust the working pressure, and different distances and densities can alter the working efficiency of the aerator. This aeration device reduces MBR membrane fouling through gas disturbance and the mutual friction between air bubbles and the separation membrane. Air is pumped into the aeration device at regular intervals and in measured quantities to maintain dissolved oxygen within a constant range. Optimized layout structure enables full-area aeration and dissolved oxygen regulation.

[0055] The monitoring and control system 13 consists of an online monitoring system and a PLC equipment control system. Online monitoring probe channels are installed at the top of each of the following zones: anaerobic zone 2, low-DO aeration zone 3, high-DO aeration zone 4, and MBR membrane zone 5. The online monitoring items for anaerobic zone 2 are dissolved oxygen, pH, chemical oxygen demand (COD), ammonia nitrogen, and total phosphorus. The online monitoring items for low-DO aeration zone 3 are dissolved oxygen and pH. The online monitoring items for high-DO aeration zone 4 are dissolved oxygen and pH. The online monitoring items for the clear water tank 6 are chemical oxygen demand (COD) and total phosphorus. The data of oxygen content (COD), ammonia nitrogen, total phosphorus; and the online monitoring items of anaerobic zone 2, low DO aeration zone 3, high DO aeration zone 4 and clear water tank 6 are all displayed in the monitoring and control system; the agitator 2-1, inlet submersible pump 8, self-priming pump 9, backwash pump 10, sludge return pump 11, and aeration blower 12 are connected to the PLC equipment control system, and the speed of agitator 2-1 and the start and stop of inlet submersible pump 8, self-priming pump 9, backwash pump 10, sludge return pump 11 and aeration blower 12 are controlled according to the indicators of the online monitoring system;

[0056] The insulation system consists of a polyurethane insulation layer wrapped around the outer surface of the integrated unit housing, with circulating water heating pipes laid within this layer. In winter, hot water is supplied to the circulating water heating pipes, and heat exchange is used to maintain the housing temperature. The hot water source is waste heat from winter heating.

[0057] The method for treating domestic sewage from highway service areas in cold regions using the intelligent modular integrated treatment equipment of Example 1 is carried out according to the following steps:

[0058] I. Start-up of the device:

[0059] The intelligent modular integrated treatment equipment for domestic sewage from highway service areas in cold regions is inoculated with residual sludge from a municipal sewage treatment plant in its anaerobic zone 2, low-DO aeration zone 3, and high-DO aeration zone 4. The sewage from the septic tank to be treated is then pretreated in an equalization tank and diluted to a COD concentration of 300–400 mg / L. It is then pumped into the influent mixing zone 1 through the inlet using an inlet submersible pump 8. The domestic sewage sequentially passes through the anaerobic zone 2, low-DO aeration zone 3, and high-DO aeration zone 4 before entering the MBR membrane zone 5. Water is drawn from the hollow fiber membrane module 5-1 by the self-priming pump 9 and transported to the clear water tank 6. A portion of the wastewater and sludge from the MBR membrane zone 5 is returned to the influent mixing zone 1 and the low DO aeration zone 3 via the sludge return pump 11 for the next cycle. The remaining sludge is discharged through another outlet via a four-way valve. The process operating parameters are as follows: the dosage ratio of polypropylene multifaceted hollow sphere packing 3-2 in the low DO aeration zone 3 is 20%; the dosage ratio of spherical plastic packing in the high DO aeration zone 4 is... The dosing ratio of packing material 4-2 is 20%; the dosing ratio of polypropylene multifaceted hollow sphere packing material 5-2 in MBR membrane zone 5 is 10%; the hydraulic retention time (HRT) is 20h, MLSS is 6000-8000mg / L, the reflux ratio is 100%, the dissolved oxygen in low DO aeration zone 3 is 0.3-0.5mg / L, the dissolved oxygen in high DO aeration zone 4 is 2mg / L, and the dissolved oxygen in MBR membrane zone 5 is 2mg / L. The changes in COD of the influent and effluent are recorded. When the system reaches the effluent... When the COD removal rate of the water reaches more than 80%, the COD concentration of the influent is gradually increased to 1000 mg / L and operated under the same process operating parameters. When the COD removal rate of the effluent reaches more than 80%, the start-up is completed. In this step, the biological process is started up using the synchronous inoculation acclimatization method with a fixed residence time. The raw wastewater with a lower concentration is introduced into the reactor that has been inoculated with seed sludge. After 80% of the degradable COD is removed, the organic load is increased, and the organic load is gradually increased until the design requirements are met.

[0060] II. Stable operation of the equipment:

[0061] The septic tank wastewater to be treated is pumped into the inlet mixing zone 1 through the inlet using a submersible pump 8. Larger impurities are removed by the filter discs. The wastewater overflows into the anaerobic zone 2, where it is mixed and anaerobic nitrified under agitation at 50 rpm. The hydraulic retention time in the anaerobic zone 2 is 3 hours. Then, it overflows sequentially into the low-DO aeration zone 3 and the high-DO aeration zone 4, where the hydraulic retention time is 12.04 hours. Finally, it enters the MBR membrane zone 5, with a hydraulic retention time of 7.73 hours. Water is then drawn from the hollow fiber membrane module 5-1 by a self-priming pump 9 and transported to the clear water tank 6, and then discharged through the outlet. A sludge return pump 11 separates a portion of the wastewater from the MBR membrane zone 5. Sludge is returned to the influent mixing zone 1 and low DO aeration zone 3 via a return pipe for the next cycle. Excess sludge is periodically discharged through another outlet via a four-way valve. During treatment, MLSS is controlled at 6000–8000 mg / L, the return ratio is 100%, dissolved oxygen in low DO aeration zone 3 is 0.3–0.5 mg / L, dissolved oxygen in high DO aeration zone 4 is 2–2.2 mg / L, and dissolved oxygen in MBR membrane zone 5 is 2–2.2 mg / L. After every 8 minutes of operation, the influent submersible pump 8, self-priming pump 9, and sludge return pump 11 are shut off, and the backwash pump 10 is turned on and run for 2 minutes to input clean water from the clear water tank into the MBR membrane reaction zone for backwashing of the hollow fiber membrane module 5-1. The backwash water intensity is 10 L·m. -2 ·s -1 Complete the treatment of domestic sewage from highway service areas in cold regions.

[0062] The rated voltage of the main sewage treatment device in this embodiment is 380V / 50HZ, the power is 5.5kW, and the daily treatment capacity is 10 to 20 tons. The water quality indicators of the influent and effluent before and after treatment are listed in Table 1.

[0063] Table 1. Water quality indicators of influent and effluent before and after treatment.

[0064] COD (mg / L) Total nitrogen (mg / L) Total phosphorus (mg / L) Before processing 684.62 124.38 4.11 After processing 29.12 4.84 0.48 Removal rate 95.75％ 96.11％ 88.32％

[0065] Example 2: This example differs from Example 1 in that the polypropylene multifaceted hollow sphere packing in the aerobic I zone of the low DO aeration zone 3 is replaced with elastic packing, and the aeration intensity in the aerobic II zone is changed, reducing the dissolved oxygen concentration in the high DO aeration zone 4 from 2 mg / L to 1 mg / L. This optimizes the combined aeration and biologically enhanced MBR process and reduces energy consumption. Other aspects are the same as in Example 1. The influent and effluent water quality indicators before and after treatment in this example are listed in Table 2.

[0066] Table 2. Water quality indicators of influent and effluent before and after treatment.

[0067] COD (mg / L) Total nitrogen (mg / L) Total phosphorus (mg / L) Before processing 642.10 132.26 3.07 After processing 46.12 4.49 0.46 Removal rate 92.82％ 96.61％ 85.02％

[0068] As can be seen from Examples 1 and 2, the integrated wastewater treatment equipment of the present invention integrates modified AO, biological enhancement, and combined aeration MBR processes, and has a good denitrification and phosphorus removal effect on domestic sewage in cold regions, with effluent quality meeting the Class A standard.

Claims

1. An intelligent modular integrated treatment equipment for domestic sewage from highway service areas in cold regions, characterized in that... The equipment includes a main wastewater treatment unit, a monitoring and control system, and a thermal insulation system. The main sewage treatment unit is a steel cuboid. From left to right, the main sewage treatment unit is divided into an influent mixing zone (1), an anaerobic zone (2), a low DO aeration zone (3), a high DO aeration zone (4), an MBR membrane zone (5), a clear water tank (6), and an equipment room (7). The influent mixing zone (1) and the anaerobic zone (2), and the anaerobic zone (2) and the low DO aeration zone (3) are separated by overflow baffles; The low DO aeration zone (3) is adjacent to the high DO aeration zone (4) and the clear water tank (6); the low DO aeration zone (3) and the high DO aeration zone (4) are separated by a perforated guide wall; the low DO aeration zone (3) and the clear water tank (6) are separated by a non-perforated partition; the high DO aeration zone (4) and the clear water tank (6) are separated by a non-perforated partition; the high DO aeration zone (4) and the MBR membrane zone (5) are separated by an overflow partition. A stirrer (2-1) is installed in the anaerobic zone (2); The bottom of the low DO aeration zone (3) is provided with a first aeration disc (3-1), and the filler (3-2) added in the low DO aeration zone (3) is an elastic filler or a polypropylene multi-faceted hollow ball filler; the bottom of the high DO aeration zone (4) is provided with a second aeration disc (4-1), and spherical plastic filler (4-2) is added in the high DO aeration zone (4). The overflow outlet at the top of the clear water pool (6); The equipment room (7) is equipped with an inlet submersible pump (8), a self-priming pump (9), a backwash pump (10), a sludge return pump (11), an aeration blower (12), and a monitoring and control system (13). An inlet is provided at the lower end of the side wall of the water mixing zone (1); the outlet pipe of the submersible pump (8) is connected to the water mixing zone (1). Hollow fiber membrane module (5-1) is fixed in the MBR membrane zone (5); polypropylene multifaceted hollow sphere packing (5-2) is added in the MBR membrane zone (5); perforated aerators (5-3) are evenly arranged at the bottom of the MBR membrane zone (5); The bottom of the MBR membrane zone (5) is provided with a return liquid outlet and connected to the sludge return pump (11). The sludge return pump (11) is then connected to the anaerobic zone (2) and the low DO aeration zone (3) through a four-way valve. The return liquid pipe of the anaerobic zone (2) adopts a multi-pipe water distribution method based on a central disc, and the output end extends to the bottom of the anaerobic zone. The other outlet of the four-way valve is used for sludge discharge. The hollow fiber membrane module (5-1) is connected to the inlet of the self-priming pump (9), and the outlet of the self-priming pump (9) is connected to the clear water tank (6); at the same time, the inlet of the backwash pump (10) is connected to the clear water tank (6), and the outlet of the backwash pump (10) is connected to the hollow fiber membrane module (5-1). The first aeration disc (3-1) is connected to the aeration fan (12) via the first gas flow meter, the second aeration disc (4-1) is connected to the aeration fan (12) via the second gas flow meter, and the perforated aerator (5-3) is connected to the aeration fan (12) via the third gas flow meter; the first aeration disc (3-1) in the low DO aeration zone (3) and the second aeration disc (4-1) in the high DO aeration zone (4) are continuously or intermittently aerated using microporous aeration; the aeration pipe of the perforated aerator is a flexible hose; The monitoring and control system (13) consists of an online monitoring system and a PLC equipment control system; The top of each of the anaerobic zone (2), low DO aeration zone (3), high DO aeration zone (4), and MBR membrane zone (5) is equipped with channels for online monitoring probes; the online monitoring items for the anaerobic zone (2) are dissolved oxygen, pH value, chemical oxygen demand (COD), ammonia nitrogen, and total phosphorus; the online monitoring items for the low DO aeration zone (3) are dissolved oxygen and pH value; the online monitoring items for the high DO aeration zone (4) are dissolved oxygen and pH value; the online monitoring items for the clear water tank (6) are chemical oxygen demand (COD), ammonia nitrogen, and total phosphorus; the data of the online monitoring items for the anaerobic zone (2), low DO aeration zone (3), high DO aeration zone (4), and clear water tank (6) are all displayed in the monitoring and control system; The agitator (2-1), the inlet submersible pump (8), the self-priming pump (9), the backwash pump (10), the sludge return pump (11), and the aeration blower (12) are connected to the PLC equipment control system. The speed of the agitator (2-1), the start and stop of the inlet submersible pump (8), the self-priming pump (9), the backwash pump (10), the sludge return pump (11), and the aeration blower (12) are controlled according to the indicators of the online monitoring system. The insulation system consists of wrapping a layer of polyurethane insulation material around the outer surface of the integrated device housing, and then laying circulating water heating pipes within the polyurethane insulation material layer.

2. The intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions according to claim 1, characterized in that... The main body of the integrated equipment has an inspection port and an exhaust port on the top, and a one-way valve is installed on the exhaust port.

3. The intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions according to claim 1 or 2, characterized in that... A detection port is opened at the bottom front side of the integrated device body, and the detection port is opened and closed by a valve.

4. The intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions according to claim 1 or 2, characterized in that, A disc filter is installed at the inlet of the water mixing zone (1).

5. The intelligent modular integrated treatment equipment for domestic sewage in highway service areas in cold regions according to claim 1 or 2, characterized in that, An oxygen release device and / or deoxygenation zone are provided between the reflux outlet at the bottom of the MBR membrane zone (5) and the sludge return pump (11).

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