Optimized energy-saving, carbon-reducing and intelligent integrated system and process for coal chemical industry wastewater treatment

Abstract

The invention discloses an optimized energy-saving, carbon-reducing and intelligent integrated system and process for coal chemical wastewater treatment, and the system comprises a high-density settling tank, a homogeneous regulating tank, a high-sludge carrier biochemical tank, a secondary sedimentation tank, an intermediate water tank, a gas-liquid jet aeration filter tank, a high-density sedimentation tank and a monitoring and recycling tank, an inlet of the high-density settling tank is connected with sewage of a coal gasification device or a production device, an outlet of the high-density settling tank is connected with the homogeneous regulating tank, an inlet of the homogeneous regulating tank is connected with domestic sewage or ground flushing water, an outlet of the homogeneous regulating tank is connected to the high-sludge carrier biochemical tank, an outlet of the high-sludge carrier biochemical tank is connected to the secondary sedimentation tank, and a supernatant self-flowing port of the secondary sedimentation tank is connected to the intermediate water tank; the middle water tank is connected with the gas-liquid jet aeration filter tank, an outlet of the gas-liquid jet aeration filter tank is connected to the high-density sedimentation tank, and a water outlet of the high-density sedimentation tank is connected to the monitoring recycling tank. The method is stable, reliable and high in treatment efficiency; labor intensity of operators can be reduced, long-period stable standard operation is achieved, and the purposes of saving cost and increasing efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to an energy-saving, carbon-reducing and intelligent integrated system and process for optimizing coal chemical industry wastewater treatment, and belongs to the field of intelligent wastewater treatment. BACKGROUND

[0002] The currently used coal chemical industry wastewater treatment process mainly includes two types: pretreatment + sequencing batch activated sludge process + advanced treatment, including traditional SBR process, and improved ICEAS, DAT-IAT, UNITANK, MSBR and other processes; nitrification-denitrification activated sludge process, including anoxic / aerobic denitrification process, anaerobic / anoxic / aerobic denitrification and phosphorus removal process-AN / O, A2 / O process, and improved A2 / O, UCT and other processes.

[0003] Through investigation, the coal chemical industry wastewater treatment system process exists in the short-sighted behavior of "paying more attention to design than research, paying more attention to equipment than commissioning, and paying more attention to delivery than operation and maintenance", and the function of each level of equipment is not verified through small-scale test to pilot test, resulting in the following problems in wastewater treatment process technology and system equipment: (1) Pretreatment: calcium and magnesium ions in coal gasification wastewater are 800-2500 mg / l, silicon dioxide is 120-280 mg / l, fluoride ions are 50-250 mg / l, and fine ash is 80-150 mg / l; high hardness leads to pipe and equipment clogging, and the activity of activated sludge in the biochemical pool is affected; high silicon dioxide leads to easy clogging of the membrane for reuse water treatment; fluoride ions exceeding 1 mg / l will seriously affect personal health if long-term drinking of water containing fluoride higher than 1.0 mg / L; inorganic fine ash, long-term accumulation affects the capacity of the regulating pool, leading to high sludge cost and safety risk for cleaning the pool; inorganic fine ash accumulation in the activated sludge of the biochemical pool leads to reduced biochemical treatment efficiency and invalid oxygen consumption.

[0004] (2) Control: The quality of coal chemical wastewater is very complex, and the treatment process is long, which is a typical high-difficult-to-biodegrade wastewater. The operation and management of coal chemical wastewater and domestic wastewater treatment plants / stations are extremely important. Manual control cannot achieve timely adjustment. In the pretreatment, the water quality, flow, PH fluctuation, and the amount of chemicals added do not change, resulting in water quantity and quality fluctuation. The amount of chemicals added cannot be adjusted in time. The mismatch between chemicals and water quality concentration leads to excessive consumption when the amount of chemicals added is too much, and the effluent does not meet the standard when the amount of chemicals added is too little. The liquid level, lifting, stirring, mud scraper, and chemical adding device are not interlocked, which cannot be precisely controlled, resulting in reduced removal efficiency and increased consumption. In the biochemical treatment, the water quality, flow fluctuation, liquid level, PH fluctuation, DO, and oxidation-reduction potential online analyzer, magnetic suspension blower, reverse digestion circulating pump, and carbon source adding device are not interlocked. The water quality fluctuation cannot adjust the oxygenation amount and time in time. Due to the change of COD and total nitrogen concentration, the oxygen supply amount and time cannot be adjusted in time, resulting in problems such as the death of activated sludge biological bacteria in biochemical tank, the growth of filamentous bacteria, sludge bulking, and non-compliance of treatment.

[0005] (3) The biochemical treatment process of coal chemical / industrial wastewater treatment plant / station: The sequencing batch activated sludge process, including anoxic / oxic denitrification process, nitrification-denitrification activated sludge process, anaerobic / anoxic / oxic denitrification and phosphorus removal process-AN / O, A2 / O process, and improved A2 / O, UCT, etc., all belong to activated sludge process. In the wastewater treatment process, the water quality concentration fluctuation impact, toxicity, oxygen supply amount, biological bacteria metabolism, filamentous bacteria bulking, and high summer water temperature, etc. lead to a large amount of sludge loss, reduced treatment efficiency, and even unable to maintain normal operation of biochemical treatment.

[0006] (4) In summer, the biochemical tank water temperature exceeds 40°C due to the influence of high incoming water temperature and high ambient temperature, which inhibits the growth of activated sludge bacteria, gradually reduces the efficiency of biochemical treatment, and even causes paralysis. The treatment water quantity gradually decreases, affecting normal treatment or exceeding the discharge standard.

[0007] (5) The high sludge carrier biochemical tank water quality fluctuation problem causes the inhibition of biological bacteria growth in the activated sludge tank, the death of biological bacteria due to load impact, and the inability to adjust the DO value, PH value, and water inflow. This leads to a gradual decrease in treatment water quantity, affecting normal treatment or exceeding the discharge standard.

[0008] (6) To improve the efficiency of biological treatment tank, the sludge concentration must be increased, which leads to sludge bulking and filamentous bacteria growth. The market generally does not have aeration equipment with oxygenation / stirring / cutting functions, which affects normal operation.

[0009] (7) The high sludge carrier biochemical tank is not provided with online instrument control, cannot timely feedback sludge concentration, temperature, pH value and the like, cannot optimize the sewage treatment operation process through feedback information, and cannot guarantee stable system operation.

[0010] (8) The sewage pretreatment and biochemical treatment technology does not consider sludge reduction, and cannot reduce the sludge generation amount as much as possible while improving the treatment efficiency. SUMMARY

[0011] The present application aims to provide an energy-saving, carbon-reducing and intelligent integrated system and process for optimizing coal chemical industry wastewater treatment, so as to realize stable and intelligent operation and control, high efficiency, energy saving, carbon reduction and efficiency increase of sewage treatment, and can be widely applied to the treatment of coal chemical industry / sewage.

[0012] To achieve the above-mentioned purposes, the technical solutions adopted by the present application are as follows: An energy-saving, carbon-reducing and intelligent integrated system for optimizing coal chemical industry wastewater treatment comprises a high-density settling tank, a homogenizing adjustment tank, a high sludge carrier biochemical tank, a secondary settling tank, an intermediate water tank, a gas-liquid jet flow aeration filter tank, a high-density sedimentation tank and a monitoring and reuse tank.

[0013] The inlet of the high-density settling tank is connected to sewage from a coal gasification device or a production device, and the outlet is connected to the homogenizing adjustment tank; the inlet of the homogenizing adjustment tank is connected to domestic sewage or ground washing water, and the outlet is connected to the high sludge carrier biochemical tank through a lifting pump; the outlet of the high sludge carrier biochemical tank is connected to the secondary settling tank; the secondary settling tank is provided with a supernatant self-flowing port and is connected to the intermediate water tank; the intermediate water tank is connected to the gas-liquid jet flow aeration filter tank through a lifting pump; the upper liquid outlet of the gas-liquid jet flow aeration filter tank is connected to the high-density sedimentation tank; and the outlet of the high-density sedimentation tank is connected to the monitoring and reuse tank.

[0014] Further, the system further comprises a sludge collection tank for collecting sludge in the high-density settling tank, the high-density sedimentation tank and the secondary settling tank, and the sludge collection tank is provided with a sludge lifting pump, and the outlet of the sludge lifting pump is connected to a sludge dewatering machine.

[0015] Further, a grating separation device is arranged at the front end of the inlet of the homogenizing adjustment tank, and the grating separation device is used for separating floating matter and suspended matter in the sewage and is connected to the homogenizing adjustment tank through a sewage pipeline.

[0016] Further, an online monitoring instrument is arranged in the front end water inlet channel of the homogenizing adjustment tank, and the online monitoring instrument is used for monitoring COD and ammonia nitrogen content and controlling the opening and closing of the homogenizing adjustment tank water inlet valve and the accident tank bypass valve.

[0017] Further, the high sludge carrier biochemical tank is provided with a cyclonic micro-particle separation device, a disc-type jet flow aerator, a magnetic suspension fan and a circulating pump.

[0018] Further, the rotating micro-particle separation device is matched with pulse air stripping for circulating separation of organic bacterial species, the pulse air stripping is arranged in the high sludge carrier biochemical tank, the outlet of the pulse air stripping is connected with the inlet of the rotating micro-particle separation device, the middle and lower parts of the rotating micro-particle separation device are conical, the side end is provided with the inlet and the direction of the inlet is tangent to the inner wall, the bottom is provided with the heavy phase organic bacterial species outlet, and the top is provided with the light phase inorganic sludge outlet, the inorganic sludge outlet is connected to the buffer tank through a pipeline, and the outlet of the buffer tank is connected to the sludge collection tank through a pipeline.

[0019] Further, the high sludge carrier biochemical tank is provided with a detector for detecting DO, PH and ORP on line, the detector is interlocked with the automatic alkali and methanol feeding device, the magnetic suspension fan and the circulating pump, and is used for real-time regulation and control of DO and PH values, control of required dissolved oxygen for degradation of organic matter and ammonia nitrogen, and return digestion dissolved oxygen.

[0020] Further, the gas-liquid jet flow aeration filter tank is internally provided with a gas-liquid anti-blocking distributor, the filter material is filled above the gas-liquid anti-blocking distributor, the filter plate and the filter cap are arranged below the gas-liquid anti-blocking distributor, the filter plate is arranged above the bottom of the filter tank, and the water inlet is arranged on the sidewall of the filter tank below the filter plate.

[0021] Further, the gas-liquid anti-blocking distributor is communicated with the jet throat pipe, the jet throat pipe is vertically arranged and the gas-liquid jet flow mixer is arranged above the jet throat pipe, the air inlet of the gas-liquid jet flow mixer is connected with the air blowing device, the liquid inlet is connected with the jet circulating pump, and the liquid inlet pipeline of the jet circulating pump is connected to the bottom of the gas-liquid jet flow aeration filter tank.

[0022] An energy-saving, carbon-reducing and intelligent integrated process for optimizing coal chemical industry wastewater treatment, which is based on the operation of the above system, and the operation process is as follows: (1) The wastewater of the coal gasification device or production device is transported to the high-density settling tank through the device area pipeline, and after settling separation in the high-density settling tank, the supernatant is sent to the homogenizing adjustment tank; (2) The domestic sewage, ground washing water and sewage in the water collecting tank are lifted to the rotating grid separation device through the lifting pump, the floating, suspended matter, fiber and mud sand in the sewage are separated by the rotating grid separation device, then the sewage is transported into the homogenizing adjustment tank through the pipeline, and the mud sand is discharged into the sludge collection tank through the pipeline; (3) The homogenizing adjusting pool is connected with various collected sewage, and the sewage is sent into the high sludge carrier biochemical pool by the sewage lifting pump, and the sludge carrier biochemical pool is used for degrading organic matter and total nitrogen by oxygenation and aeration, and the treated sewage is sent into the secondary sedimentation tank for liquid-solid separation, and then the supernatant of the secondary sedimentation tank is self-flowed to the intermediate pool, and the secondary sedimentation tank is matched with the pulse air stripping for sludge back-digestion and external discharge; when sludge bulking or treatment failure occurs in the sludge carrier biochemical pool, the rotating micro-particle separation device is started to separate organic bacteria by internal circulation, and the separated organic bacteria is returned to the sludge carrier biochemical pool, and the separated residue sludge is discharged into the sludge pool; (4) The sewage in the intermediate pool is sent to the gas-liquid jet aeration filter pool by the lifting pump, and the effluent of the gas-liquid jet aeration filter pool is self-flowed to the high-density settling tank.

[0023] The beneficial effects of the present application are as follows: (1) The system is stable and reliable, and has high treatment efficiency; the labor intensity of the operator can be reduced, long-period stable and standard operation can be realized, and the purpose of saving and increasing efficiency is achieved.

[0024] (2) The coal chemical industry wastewater contains high calcium and magnesium ions, silicon, fluorine, inorganic fine ash and phosphorus, and these ions and inorganic fine ash will cause the clogging of pipelines and equipment without treatment, and the long-term accumulation of fine ash affects the capacity of the adjusting pool, leading to difficult maintenance, high sludge cleaning cost of the pool, high labor cost and safety risk; the present system adopts multi-stage reaction + high-efficiency sedimentation technology to simultaneously remove calcium and magnesium ions, silicon, fluorine, inorganic fine ash and phosphorus; after treatment, the calcium and magnesium ions are less than 700 mg / l, the silicon is less than 30 mg / l, the fluorine is less than 1 mg / l, the inorganic fine ash is less than 30 mg / l, and the phosphorus is less than 0.5 mg / l; the clogging problem of pipelines and equipment is solved, and the requirements of silicon and fluorine deep treatment are met, and the inorganic sludge in the activated sludge is also reduced, thereby improving the subsequent biochemical treatment efficiency and reducing the energy consumption by 10%.

[0025] (3) The front end of the homogenizing adjusting pool is designed with a ditch and adopts artificial intelligence-online COD and ammonia nitrogen monitoring to accurately detect water quality fluctuations; if the water quality exceeds the upper limit of the design value, the system automatically switches into the emergency pool to ensure the stable operation of the high sludge carrier biochemical treatment facility under normal working conditions; and the biological bacteria impact, death and treatment failure of the biochemical treatment pool caused by water quality fluctuations are avoided.

[0026] (4) The problems of biological bacteria metabolism, sludge bulking and aging of long-term running biochemical activated sludge are overcome, and the integrated technology is applied to select slowly growing plant bacteria, so that the fast growing bacteria do not dominate, a certain amount of plant bacteria is accumulated and safely reserved, and the old bacteria, metabolic bacteria and dead sludge are eliminated, thereby improving the biochemical treatment efficiency by 10%.

[0027] (5) Precise interlocking automatic control can be realized, aeration DO value in each stage and air blower air supply interlocking are realized, and the dissolved oxygen required for degrading organic matter and ammonia nitrogen can be effectively controlled, so that 10% of power consumption can be saved. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a system structure schematic diagram of the present application; Figure 2 is a cyclone micro-particle separation device schematic diagram; Figure 3 is a gas-liquid jet aeration filter schematic diagram.

[0029] The figure is marked as: 1-high density settling tank, 2-sludge pump, 3-magnetic suspension blower, 4-homogeneous conditioning tank, 5-rotary grid separation device, 6-first lifting pump, 7-high sludge carrier biochemical tank, 8-butterfly jet aerator, 9-jet circulating pump, 10-cyclone micro-particle separation device, 101-cyclone inlet, 102-heavy phase outlet, 103-light phase outlet, 104-buffer tank, 11-second sedimentation tank, 12-pulse air-lift device, 13-intermediate water tank, 14-second lifting pump, 15-gas-liquid jet aeration filter, 1501-filter body, 1502-gas-liquid jet mixer, 1503-anti-blocking gas-liquid distributor, 1504-filter plate, 1505-drainage filter cap, 1506-filter material, 1507-water distribution pipe, 1508-jet pump, 16-high density settling tank, 17-monitoring reuse tank, 18-sludge collection tank, 19-sludge lifting pump, 20-sludge dewatering machine. DETAILED DESCRIPTION

[0030] The present application will be described in detail below in combination with the drawings and specific embodiments.

[0031] As Figure 1The application discloses an energy-saving, carbon-reducing and intelligent integrated system for optimizing coal chemical industry wastewater treatment, which comprises a high-density settling tank 1, a homogenizing adjusting pool 4, a high-sludge carrier biochemical pool 7, a secondary settling pool 11, an intermediate pool 13, a gas-liquid jet flow aeration filter pool 15, a high-density sedimentation pool 16, a monitoring and recycling pool 17 and a sludge collecting pool 18. The inlet of the high-density settling tank 1 is connected with sewage from a coal gasification device or a production device, and the outlet is connected with the homogenizing adjusting pool 4. The inlet of the homogenizing adjusting pool 4 is connected with domestic sewage or ground washing water, and the outlet is connected with the high-sludge carrier biochemical pool 7 through a lifting pump. The outlet of the high-sludge carrier biochemical pool 7 is connected with the secondary settling pool 11. The secondary settling pool 11 is provided with a supernatant self-flowing water outlet and is connected with the intermediate pool 13. The intermediate pool 13 is connected with the gas-liquid jet flow aeration filter pool 15 through a lifting pump. The upper liquid outlet of the gas-liquid jet flow aeration filter pool 15 is connected with the high-density sedimentation pool 16, and the water outlet of the high-density sedimentation pool 16 is connected with the monitoring and recycling pool 17. The sludge collecting pool 18 is used for collecting sludge in the high-density settling tank 1, the high-density sedimentation pool 16 and the secondary settling pool 11. The sludge collecting pool is provided with a sludge lifting pump 19, and the outlet of the sludge lifting pump 19 is connected with a sludge dewatering machine 20.

[0032] In the embodiment, the inlet of the homogenizing adjusting pool 4 is provided with a rotary microfiltration separation device 5, the microfiltration separation device 5 is used for separating floating matters, suspended matters, fibers and mud sand in the sewage and is connected with the homogenizing adjusting pool 4 through a sewage pipeline. An online monitoring instrument is arranged in the front water inlet channel of the homogenizing adjusting pool 4, the online monitoring instrument is used for monitoring the contents of COD and ammonia nitrogen and controlling the opening and closing of a homogenizing adjusting pool water inlet valve and an accident pool bypass valve. If the water quality exceeds the upper limit of the design value, the accident pool is automatically switched in, so that the high-sludge carrier biochemical treatment is stably operated under normal conditions, and the impact of water quality fluctuation on the biological bacteria in the biochemical treatment pool is solved.

[0033] In the embodiment, the high-sludge carrier biochemical pool 7 is provided with a rotary micro-particle separation device 10, a disc type jet flow aerator 8, a magnetic suspension fan 3 and a jet flow circulating pump 9. The rotary micro-particle separation device 10 is provided with a pulse air stripping for cyclic separation of organic bacteria, the pulse air stripping is arranged in the high-sludge carrier biochemical pool, and the outlet of the pulse air stripping is connected with the inlet of the rotary micro-particle separation device 10. Figure 2 The rotary micro-particle separation device 10 is conical in the middle and lower parts, the side end is provided with an inlet, the inlet direction is tangent to the inner wall, the bottom is provided with a heavy phase organic bacteria outlet, and the top is provided with a light phase inorganic sludge outlet. The inorganic sludge outlet is connected with a buffer tank through a pipeline, and the outlet of the buffer tank is connected with the sludge collecting pool through a pipeline.

[0034] The working principle of the cyclone separator: Granular activated sludge (≥3mm), aging bacteria, light, loose, fine, and suspended particles after pre-treatment are lifted to the cyclone inlet 101. The feed is tangential. The mixed fluid (containing suspended particles or fluids of different densities) then enters the upper part of the cyclone separator tangentially under pressure. Heavy phase / large particle organic bacteria are thrown against the wall of the cyclone separator under strong centrifugal force and move downwards with the cyclone to the bottom outlet for discharge. Light, loose, fine, and suspended particles are thrown upwards by centrifugal force and pass through pipes to a buffer tank. The bottom of the buffer tank has a sludge outlet, which discharges into a sludge collection tank. This cyclone separation screens out slow-growing plant bacteria, preventing rapidly growing bacteria from dominating and accumulating and safely retaining a certain amount of plant bacteria. The hydrocyclone separation eliminates aging bacteria, metabolic bacteria, and dead sludge, thereby improving the biochemical treatment efficiency by 10%.

[0035] In this embodiment, the high-sludge carrier biochemical tank 7 is equipped with an online detector for DO, pH, and ORP. This detector is interlocked with the automatic dosing device, magnetic levitation blower 3, and circulating pump to regulate DO and pH values ​​in real time, controlling the dissolved oxygen required for the degradation of organic matter and ammonia nitrogen. The biochemical tank utilizes online DO, pH, and oxidation potential to precisely control DO and pH values ​​in real time when water quality and quantity fluctuate. This ensures timely automatic adjustment of DO and alkali solutions in response to changes in water quality and deterioration, solving the problem of interlocking aeration volume with blower air supply at each stage of the biochemical tank. This effectively controls the dissolved oxygen required for the degradation of organic matter and ammonia nitrogen, achieving energy savings of 10%. Simultaneously, a high-efficiency disc jet aerator 8 is used, which has both oxygenation and stirring functions. This optimizes the technical problems of hydraulic flow resistance and impact energy loss, enhances hydraulic compression and propulsion, increases nozzle flow rate, gas, liquid, and solid mixing rate, improves diffusion capacity and diffusion area, and increases oxygenation efficiency by 15%. Furthermore, due to the jet cutting and diffusion principle, it inhibits the growth of filamentous bacteria and prevents sludge bulking. Compared with centrifugal blowers, the energy-saving magnetic levitation blower 3 can save 30% of the installed power.

[0036] In this embodiment, as Figure 3 The gas-liquid jet aeration filter 15 is equipped with an anti-clogging gas-liquid distributor 1503. Filter media 1506 is filled above the anti-clogging gas-liquid distributor 1503, and a filter plate 1054 is located below it. The filter plate 1504 is also positioned above the bottom of the filter tank. An inlet is opened on the side wall of the filter tank below the filter plate 1504. The anti-clogging gas-liquid distributor 1503 is connected to a water distribution pipe 1507. The water distribution pipe 1507 is vertically arranged, and a gas-liquid jet mixer 1502 is located above it. The air inlet of the gas-liquid jet mixer 1502 is connected to a blower, and the liquid inlet is connected to a jet circulation pump 1508. The liquid inlet pipe of the jet circulation pump 1508 is connected to the bottom of the gas-liquid jet aeration filter tank.

[0037] The working principle of the gas-liquid mixed jet flow aeration filter tank is as follows: sewage enters from the bottom inlet of the aeration filter tank, is uniformly distributed upwards through the water distribution pipe to the filter plate 1507, the filter plate 1507 is opened according to the water inlet and backwashing water flow rate, the sewage is discharged through the water discharge filter cap 1505 on the filter plate, an anti-blocking gas-liquid distributor 1503 is arranged above the filter cap, and the mixed gas-liquid from the gas-liquid mixing jet device 1502 is supplied to the filter material filter layer through the anti-blocking gas-liquid distributor 1503 for oxygenation and aeration; the air source of the gas-liquid mixing jet device 1502 is from a blower, the circulating water is lifted to the gas-liquid mixing jet device 1502 by the jet circulating pump 1508 through the mixed sewage at the bottom of the aeration filter tank; in this way, the sewage passes through the filter plate, the filter cap, the gas-liquid distributor, the filter material filter layer and the water collecting tank, and is then discharged. The filter material of the filter material layer is attached to a high biological bacteria to degrade organic matter and ammonia nitrogen, effectively solving the problems of easy blocking, short flow, uneven aeration, low oxygenation efficiency and the like of the traditional biological filter tank, expanding the application range, and providing reliable guarantee for the advanced treatment of municipal sewage and industrial sewage.

[0038] The process flow of the energy-saving, carbon-reducing and intelligent integrated system based on the optimization of the coal chemical industry wastewater treatment is as follows: (1) The sewage of the coal gasification device or production device is transported to the high-density settling tank through the device area pipeline, and after settling reaction in the high-density settling tank, it is sent to the homogenizing adjustment tank; (2) The domestic sewage, ground washing water and sewage in the collecting tank are lifted to the rotary screen separation device by the lifting pump, the suspended solids in the sewage are separated by the rotary screen separation device, and then the sewage is introduced into the homogenizing adjustment tank through the pipeline, and the suspended solids are discharged into the sludge collection tank through the pipeline; (3) After the homogenizing adjustment tank is connected to various collected sewage, the sewage is sent into the high sludge carrier biochemical tank by the sewage lifting pump, and after the organic bacteria are separated in the sludge carrier biochemical tank, the sewage is sent into the secondary sedimentation tank, and then the supernatant of the secondary sedimentation tank flows to the intermediate tank by itself, and the secondary sedimentation tank is matched with the pulse air stripping for sludge back-digestion and external discharge; (4) The sewage in the intermediate tank is sent to the gas-liquid jet flow aeration filter tank by the lifting pump, and the effluent of the gas-liquid jet flow aeration filter tank flows to the high-density settling tank by itself; the effluent of the high-density settling tank flows to the monitoring and reuse tank by itself.

[0039] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the above examples do not limit the protection scope of the present application in any form, and any technical solutions obtained by equivalent replacement or the like fall within the protection scope of the present application. The parts not involved in the present application are the same as or can be realized by the prior art.

Claims

1. An optimized energy-saving, carbon-reducing, and intelligent integrated system for treating coal chemical wastewater, characterized in that: It includes a high-density settling tank, a homogenization and equalization tank, a high-sludge carrier biological treatment tank, a secondary settling tank, an intermediate water tank, a gas-liquid jet aeration filter, a high-density sedimentation tank, and a monitoring and reuse tank. The high-density settling tank has its inlet connected to wastewater from a coal gasification unit or production unit, and its outlet connected to a homogenization equalization tank. The homogenization equalization tank has its inlet connected to domestic sewage or surface flushing water, and its outlet connected to a high-sludge carrier biological treatment tank via a lift pump. The outlet of the high-sludge carrier biological treatment tank is connected to a secondary settling tank. The secondary settling tank is equipped with a supernatant gravity flow outlet connected to an intermediate water tank. The intermediate water tank is connected to a gas-liquid jet aeration filter via a lift pump. The upper liquid outlet of the gas-liquid jet aeration filter is connected to a high-density sedimentation tank. The outlet of the high-density settling tank is connected to a monitoring and reuse tank.

2. The energy-saving, carbon-reducing, and intelligent integrated system for optimizing coal chemical wastewater treatment according to claim 1, characterized in that, The system also includes a sludge collection tank for collecting sludge from the high-density settling tank, high-density sedimentation tank and secondary settling tank. The sludge collection tank is equipped with a sludge lift pump, the outlet of which is connected to a sludge dewatering machine.

3. The energy-saving, carbon-reducing, and intelligent integrated system for optimizing coal chemical wastewater treatment according to claim 1, characterized in that, The inlet of the equalization tank is equipped with a bar screen separation device, which is used to separate floating and suspended solids in the sewage and is connected to the equalization tank through a sewage pipe.

4. The energy-saving, carbon-reducing, and intelligent integrated system for optimizing coal chemical wastewater treatment according to claim 1, characterized in that, An online monitoring instrument is installed in the inlet ditch at the front end of the homogenization equalization tank. The online monitoring instrument is used to monitor the COD and ammonia nitrogen content and control the opening and closing of the inlet valve of the homogenization equalization tank and the bypass valve of the emergency tank.

5. The energy-saving, carbon-reducing, and intelligent integrated system for optimizing coal chemical wastewater treatment according to claim 1, characterized in that, The high sludge carrier biochemical tank is equipped with a vortex microparticle separation device, a disc jet aerator, a magnetic levitation blower, and a circulation pump.

6. The energy-saving, carbon-reducing, and intelligent integrated system for optimizing coal chemical wastewater treatment according to claim 5, characterized in that, The cyclone microparticle separator is equipped with a pulse airlift for circulating separation of organic bacteria. The pulse airlift is installed in a high sludge carrier biochemical tank. The outlet of the pulse airlift is connected to the inlet of the cyclone microparticle separator. The lower part of the cyclone microparticle separator is conical, with an inlet on the side and the inlet direction is tangent to the inner wall. The bottom has an outlet for heavy phase granular organic bacteria, and the top has an outlet for light phase inorganic sludge. The inorganic sludge outlet is connected to a buffer tank through a pipeline, and the outlet of the buffer tank is connected to a sludge collection tank through a pipeline.

7. The energy-saving, carbon-reducing, and intelligent integrated system for optimizing coal chemical wastewater treatment according to claim 5, characterized in that, The high sludge carrier biochemical tank is equipped with an online detector for DO, pH and ORP. This detector is interlocked with an automatic dosing device, a magnetic levitation fan and a circulating pump to regulate DO and pH values ​​in real time and control the dissolved oxygen required for the degradation of organic matter and ammonia nitrogen.

8. The energy-saving, carbon-reducing, and intelligent integrated system for optimizing coal chemical wastewater treatment according to claim 1, characterized in that, The gas-liquid jet aeration filter is equipped with an anti-clogging gas-liquid distributor. Filter media is filled above the anti-clogging gas-liquid distributor, and a filter plate and filter cap are provided below it. The filter plate is also located above the bottom of the filter tank, and an inlet is opened on the side wall of the filter tank located below the filter plate.

9. The energy-saving, carbon-reducing, and intelligent integrated system for optimizing coal chemical wastewater treatment according to claim 8, characterized in that, The anti-clogging gas-liquid distributor is connected to the jet throat, which is vertically arranged and has a gas-liquid jet mixer above it. The air inlet of the gas-liquid jet mixer is connected to a blower, and the liquid inlet is connected to a jet circulation pump. The liquid inlet pipe of the jet circulation pump is connected to the bottom of the gas-liquid jet aeration filter.

10. An optimized, energy-saving, carbon-reducing, and intelligent integrated process for treating coal chemical wastewater, characterized in that: This process operates based on the system described in claim 1, and the operation is as follows: (1) Wastewater from the coal gasification unit or production unit is transported to the high-density settling tank via pipelines in the unit area. After settling and separation in the high-density settling tank, the supernatant is sent to the homogenization and equalization tank. (2) Domestic sewage and ground flushing water are collected in the water tank and pumped to the rotary bar separator. The rotary bar separator separates floating, suspended solids, fibers and mud and sand in the sewage. Then the sewage enters the equalization tank through the pipeline and the sludge is discharged into the sludge collection tank through the pipeline. (3) After the equalization tank receives various collected sewage, the sewage is then pumped into the high sludge carrier biochemical tank by sewage lifting pump. The sludge carrier biochemical tank is oxygenated and aerated to degrade organic matter and total nitrogen. After treatment, the sewage enters the secondary sedimentation tank for liquid-solid separation. Then, the supernatant after sedimentation in the secondary sedimentation tank flows by gravity to the intermediate water tank. The secondary sedimentation tank is equipped with pulse air lifting for sludge back-digestion and discharge. When sludge bulking or substandard treatment occurs during the operation of the sludge carrier biochemical tank, the cyclone microparticle separator is started to separate organic bacteria through internal circulation. The separated organic bacteria are returned to the sludge carrier biochemical tank, and the separated sludge is discharged into the sludge tank. (4) Wastewater in the intermediate pool is pumped to the gas-liquid jet aeration filter by a lift pump. The effluent from the gas-liquid jet aeration filter flows by gravity to the high-density sedimentation tank. The effluent from the high-density sedimentation tank flows by gravity to the monitoring and reuse tank.

Images