Integrated sewage treatment equipment

Abstract

The utility model relates to sewage treatment technical field, especially a kind of integrated sewage treatment equipment, including integrated in same cabinet and sequentially connected high-density sedimentation tank, denitrification biological filter, ozone catalytic oxidation tower, simultaneous nitrification and denitrification filter and sludge conditioning tank, sludge conditioning tank is connected with high-density sedimentation tank, denitrification biological filter and simultaneous nitrification and denitrification filter respectively, for collecting the water-containing sludge generated by high-density sedimentation tank, denitrification biological filter and simultaneous nitrification and denitrification filter, can solve the problem that equipment is dispersed when current ozone advanced oxidation combined technology treats refractory organic wastewater, reaction tower is high, inconvenient to move, while efficiently treating refractory organic wastewater.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an integrated wastewater treatment device. Background Technology

[0002] In industrial production processes, the discharge of recalcitrant organic wastewater (containing highly toxic and chemically stable substances such as phenols, polycyclic aromatic hydrocarbons, halogenated hydrocarbons, dyes, and pesticides) poses a serious threat to water environmental safety. Its advanced treatment is a critical issue that urgently needs to be addressed in the environmental protection field. Currently, the main processes used in the industry for the advanced treatment of recalcitrant organic wastewater include adsorption, biodegradation, and advanced oxidation technologies. Among these, ozone oxidation technology, a type of advanced oxidation technology, is widely used in this field due to its advantages such as fast reaction speed, high treatment efficiency, and effective decomposition of large-molecule recalcitrant organic matter. Related derivative ozone advanced oxidation combination technologies have also become an important choice for treating recalcitrant organic wastewater.

[0003] However, existing ozone advanced oxidation combined technology for treating recalcitrant organic wastewater has a core drawback: its equipment layout is dispersed and lacks mobility. Currently, the various reactors in these systems are often scattered across different workshops, and the reaction towers are quite tall, typically requiring permanent infrastructure to form a fixed treatment system. This design not only results in a large overall footprint but also necessitates complex on-site installation and commissioning, consuming significant manpower, resources, and time. More importantly, it cannot adapt to highly dispersed wastewater sources with small discharge volumes (such as intermittent wastewater discharges from small chemical plants or enterprises in remote areas), failing to meet the practical needs for flexible and rapid wastewater treatment in such scenarios. This severely limits the application scope and convenience of ozone advanced oxidation combined technology in the treatment of recalcitrant organic wastewater. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an integrated sewage treatment equipment that can solve the problems of dispersed equipment, high reaction tower and inconvenient movement when the existing ozone advanced oxidation combined technology is used to treat refractory organic wastewater, while efficiently treating refractory organic wastewater.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: An integrated wastewater treatment device includes a high-density sedimentation tank, a denitrifying biological filter, an ozone catalytic oxidation tower, a simultaneous nitrification-denitrification filter, and a sludge conditioning tank, all integrated in the same tank and connected in sequence. The sludge conditioning tank is connected to the high-density sedimentation tank, the denitrifying biological filter, and the simultaneous nitrification-denitrification filter, respectively. The sludge conditioning tank is used to collect water-containing sludge produced by the high-density sedimentation tank, denitrification biological filter, and simultaneous nitrification-denitrification filter.

[0006] Furthermore, the denitrifying biological filter includes a filter body, which contains, from top to bottom, a water distribution area, a packing material area, a support layer, and an effluent collection area.

[0007] Furthermore, a buffer tank is provided between the ozone catalytic oxidation tower and the simultaneous nitrification-denitrification filter, and the buffer tank is connected to the outlet of the ozone catalytic oxidation tower and the inlet of the simultaneous nitrification-denitrification filter.

[0008] Furthermore, the buffer pool is provided with multiple baffles from top to bottom, and there is a gap between two adjacent baffles.

[0009] Furthermore, multiple baffles are staggered on opposite inner walls of the buffer pool.

[0010] Furthermore, the baffle plate is provided with a baffle groove, and an ultraviolet light device is provided in the baffle groove.

[0011] Furthermore, a tail gas destruction device is connected between the outlet of the ozone catalytic oxidation tower and the buffer tank.

[0012] Furthermore, the ozone catalytic oxidation tower is equipped with two ozone catalytic oxidation reactors, each of which is connected to a denitrification biological filter and a simultaneous nitrification-denitrification filter, respectively.

[0013] Furthermore, the chamber is also equipped with a plate and frame filter press, which is connected to the sludge conditioning tank.

[0014] Furthermore, the container is also equipped with a chemical mixing tank, which is connected to the sludge conditioning tank.

[0015] The beneficial effects of this utility model are as follows: This solution integrates a high-density sedimentation tank, a denitrifying biological filter, an ozone catalytic oxidation tower, a simultaneous nitrification-denitrification filter, and a sludge conditioning tank into a single enclosure. This fundamentally solves the problems of traditional ozone advanced oxidation combined equipment, such as dispersed locations, tall reaction towers, and inconvenient mobility. It eliminates the need for a permanent base and can flexibly adapt to decentralized wastewater treatment scenarios with small discharge volumes, avoiding the high costs of long-distance water transportation and the uneconomical treatment of small volumes. By connecting the sludge conditioning tank to the high-density sedimentation tank, denitrifying biological filter, and simultaneous nitrification-denitrification filter, it centrally collects the water-containing sludge produced by these components. This effectively avoids secondary pollution caused by multiple sludge piles, transfers, and leaks in traditional decentralized treatment, facilitating subsequent sludge dewatering and disposal. Furthermore, the overall equipment has a small footprint and low site requirements, further enhancing its adaptability to different application scenarios. Attached Figure Description

[0016] Figure 1 This is a connection block diagram of the integrated sewage treatment equipment of this utility model; Figure 2 This is a schematic diagram of the integrated sewage treatment equipment of this utility model; Figure 3 This is a schematic diagram of the denitrification biological filter in the integrated wastewater treatment equipment of this utility model; Figure 4 This is a connection block diagram of the integrated sewage treatment equipment of this utility model; Figure 5 This is a schematic diagram of the buffer tank of the integrated sewage treatment equipment of this utility model; Figure 6 This is a connection block diagram of the integrated sewage treatment equipment of this utility model; Label Explanation: 1. Box body; 2. High-density sedimentation tank; 3. Denitrification biological filter; 31. Filter body; 32. Water distribution area; 33. Packing material area; 34. Support layer; 35. Effluent collection area; 4. Ozone catalytic oxidation tower; 41. Ozone catalytic oxidation reactor; 5. Simultaneous nitrification and denitrification filter; 6. Sludge conditioning tank; 7. Buffer pool; 71. Baffle plate; 711. Baffle channel; 72. Ultraviolet light device; 8. Plate and frame filter press; 9. Pharmaceutical mixing tank. Detailed Implementation

[0017] To explain in detail the technical content, objectives, and effects of this utility model, the following description is provided in conjunction with the embodiments and accompanying drawings.

[0018] Please refer to Figure 1 and Figure 2 An integrated wastewater treatment device includes a high-density sedimentation tank 2, a denitrification biological filter 3, an ozone catalytic oxidation tower 4, a synchronous nitrification and denitrification filter 5, and a sludge conditioning tank 6, all integrated in the same housing 1 and connected in sequence. The sludge conditioning tank 6 is connected to the high-density sedimentation tank 2, the denitrification biological filter 3, and the synchronous nitrification and denitrification filter 5, respectively. The sludge conditioning tank 6 is used to collect water-containing sludge produced by the high-density sedimentation tank 2, the denitrification biological filter 3, and the simultaneous nitrification-denitrification filter 5.

[0019] As can be seen from the above description, the beneficial effects of this utility model are as follows: This solution integrates a high-density sedimentation tank 2, a denitrifying biological filter 3, an ozone catalytic oxidation tower 4, a simultaneous nitrification-denitrification filter 5, and a sludge conditioning tank 6 into a single enclosure 1. This fundamentally solves the problems of traditional ozone advanced oxidation combined equipment, such as dispersed locations, high reaction towers, and inconvenient mobility. It eliminates the need for a permanent base and can flexibly adapt to decentralized wastewater treatment scenarios with small discharge volumes, avoiding the high costs of long-distance water transportation and the uneconomical treatment of small volumes. By connecting the sludge conditioning tank 6 to the high-density sedimentation tank 2, the denitrifying biological filter 3, and the simultaneous nitrification-denitrification filter 5, it centrally collects the water-containing sludge produced by these components. This effectively avoids secondary pollution caused by multiple sludge piles, transfers, and leaks in traditional decentralized treatment, facilitating subsequent sludge dewatering and disposal. Furthermore, the overall equipment has a small footprint and low site requirements, further enhancing its adaptability to different application scenarios.

[0020] For further details, please refer to Figure 2 and Figure 3 The denitrifying biological filter 3 includes a filter body 31, and the filter body 31 is provided with a water distribution area 32, a packing material area 33, a support layer 34 and an effluent collection area 35 from top to bottom.

[0021] As described above, the layered structure design from top to bottom within the filter body 31 guides the orderly flow of wastewater. The water distribution zone 32 ensures uniform wastewater distribution, avoiding uneven load and inconsistent treatment effects on the support layer 34 caused by localized water flow concentration. The packing zone 33 not only provides stable support for the support layer 34, preventing filter media from being lost with the water flow, but also ensures smooth water flow and avoids blockage. The support layer 34 provides ample attachment carriers for denitrifying microorganisms, which can efficiently convert nitrates in the wastewater into nitrogen gas, achieving total nitrogen removal. It can also retain some suspended solids and degrade small molecule organic matter, further purifying the water quality. The effluent collection zone 35 collects the treated wastewater, providing a stable water supply for the subsequent ozone catalytic oxidation tower 4. Overall, this improves the treatment stability and efficiency of the denitrifying biological filter 3, laying a good foundation for subsequent advanced treatment.

[0022] For further details, please refer to Figure 2 and Figure 4 A buffer tank 7 is provided between the ozone catalytic oxidation tower 4 and the synchronous nitrification-denitrification filter 5. The buffer tank 7 is connected to the outlet of the ozone catalytic oxidation tower 4 and the inlet of the synchronous nitrification-denitrification filter 5, respectively.

[0023] As described above, the buffer tank 7 provides sufficient time for the residual ozone carried by the effluent from the ozone catalytic oxidation tower 4 to decompose. This ensures that the residual ozone is completely converted into oxygen before entering the simultaneous nitrification-denitrification filter 5, avoiding the problem of residual ozone inhibiting the activity of microorganisms in the filter and affecting the biological treatment effect. It also prevents secondary pollution caused by the direct emission of residual ozone. In addition, the oxygen produced by ozone decomposition can directly provide oxygen for the biological reaction in the simultaneous nitrification-denitrification filter 5, replacing the traditional mechanical aeration method, reducing the energy consumption of aeration equipment, realizing the cascade utilization of energy, and effectively reducing the overall operating cost of the equipment.

[0024] For further details, please refer to Figure 5 The buffer pool 7 is provided with multiple baffles 71 from top to bottom, and there is a gap between two adjacent baffles 71.

[0025] As described above, multiple baffles 71 are arranged from top to bottom within the buffer tank 7, which effectively prolongs the residence time of the water flow within the buffer tank 7, providing favorable conditions for the full decomposition of residual ozone, further improving the ozone decomposition efficiency, and reducing the amount of ozone entering the subsequent simultaneous nitrification and denitrification filter 5. The reasonable spacing between adjacent baffles 71 ensures smooth water flow, avoids water flow congestion, and prevents water flow short-circuiting, ensuring that each part of the water flow can fully contact and react with the baffles 71, guaranteeing the treatment effect of the buffer tank 7 and maintaining the stability of the effluent water quality.

[0026] For further details, please refer to Figure 5 Multiple baffles 71 are staggered on opposite inner walls of the buffer pool 7.

[0027] As described above, the staggered arrangement of multiple baffles 71 on the opposing inner walls of the buffer tank 7 creates a complex flow pattern within the buffer tank 7, enhancing the turbulence of the water flow, further extending the actual residence time, strengthening the contact reaction between residual ozone and water, accelerating the ozone decomposition rate, and improving the thoroughness of ozone decomposition. Simultaneously, the turbulent water flow also provides a certain stirring effect, keeping the water quality in the buffer tank 7 uniform, avoiding localized water quality fluctuations, and providing stable influent conditions for the subsequent simultaneous nitrification-denitrification filter 5, preventing water quality fluctuations from affecting the biological treatment effect.

[0028] For further details, please refer to Figure 5 The baffle plate 71 is provided with a baffle groove 711, and an ultraviolet light device 72 is provided in the baffle groove 711.

[0029] As described above, the baffle trough 711 on the baffle plate 71 optimizes the water flow path, guiding the water to flow more fully through the irradiation area of ​​the ultraviolet light device 72, ensuring sufficient contact between the water and the ultraviolet light. The ultraviolet light device 72 within the baffle trough 711 provides energy, causing ozone to rapidly photodecompose into oxygen and oxygen atoms. Under normal conditions of 25℃ and neutral pH, this significantly shortens the half-life of ozone in water from 20-30 minutes to 5-8 minutes, substantially improving ozone decomposition efficiency and ensuring that the water entering the simultaneous nitrification-denitrification filter 5 is free of residual ozone. Simultaneously, the sufficient oxygen generated by the rapid decomposition of ozone can promptly meet the oxygen demand of the biological reactions within the simultaneous nitrification-denitrification filter 5, further enhancing the overall treatment efficiency of the entire wastewater treatment system.

[0030] Furthermore, a tail gas destruction device is connected between the outlet of the ozone catalytic oxidation tower 4 and the buffer tank 7.

[0031] As described above, connecting the exhaust gas destruction device between the outlet of the ozone catalytic oxidation tower 4 and the buffer tank 7 allows for targeted treatment of the exhaust gas discharged from the outlet of the ozone catalytic oxidation tower 4. This completely eliminates residual ozone in the exhaust gas, preventing direct ozone emissions into the environment and thus protecting the health of on-site operators. Furthermore, the exhaust gas destruction device prevents untreated residual ozone from directly entering the buffer tank 7, which could lead to incomplete ozone decomposition within the buffer tank 7 and affect subsequent biological treatment. This provides further assurance for the stable operation of the simultaneous nitrification-denitrification filter 5.

[0032] For further details, please refer to Figure 2 The ozone catalytic oxidation tower 4 is equipped with two ozone catalytic oxidation reactors 41, each of which is connected to the denitrification biological filter 3 and the synchronous nitrification-denitrification filter 5 respectively.

[0033] As described above, two ozone catalytic oxidation reactors 41 are installed within the ozone catalytic oxidation tower 4, each connected to the denitrification biological filter 3 and the simultaneous nitrification-denitrification filter 5, respectively. This dual-reactor design, combined with the micro-nano bubble technology and TiO2-MnO2 / Al2O3 catalyst in the equipment, significantly enhances the mass transfer efficiency and catalytic oxidation reaction rate of ozone, more efficiently decomposing large, recalcitrant organic molecules in wastewater and converting them into small, easily degradable substances. This greatly improves the biodegradability of the wastewater, creating favorable conditions for subsequent biological treatment in the simultaneous nitrification-denitrification filter 5. Simultaneously, the dual-reactor design provides redundancy; if one reactor malfunctions and requires repair or catalyst replacement, the other reactor can continue operating normally, ensuring continuous and stable operation of the wastewater treatment system, reducing the risk of equipment downtime, and guaranteeing uninterrupted completion of wastewater treatment tasks.

[0034] For further details, please refer to Figure 2 and Figure 6 It also includes a plate and frame filter press 8, which is connected to the sludge conditioning tank 6.

[0035] As described above, the plate and frame filter press 8 is connected to the sludge conditioning tank 6, enabling efficient dewatering of the water-containing sludge in the tank 6 that has undergone chemical conditioning. This process concentrates the sludge (95%-97% moisture content) into sludge cakes with lower moisture content, significantly reducing sludge volume and lowering the costs of subsequent transportation, storage, and disposal. The dewatered sludge exhibits more stable physical properties, making it easier for resource utilization (such as incineration for power generation, brick making, etc.) or safe landfill disposal. This avoids secondary pollution problems such as soil and groundwater contamination that may result from the indiscriminate dumping of wet sludge, thus improving the environmental friendliness and economic efficiency of sludge treatment.

[0036] For further details, please refer to Figure 2 and Figure 6 It also includes a chemical mixing tank 9, which is connected to the sludge conditioning tank 6.

[0037] As described above, the mixing tank 9 is connected to the sludge conditioning tank 6, allowing for thorough mixing of coagulants (such as polyaluminum chloride), flocculants (such as cationic polyacrylamide), and pH adjusters (such as lime and sulfuric acid) added to the sludge conditioning tank 6. This ensures uniform dispersion of the chemicals, preventing localized excessively high or low concentrations, thereby improving the reaction efficiency between the chemicals and the sludge and effectively enhancing the sludge dewatering performance. Simultaneously, thorough mixing reduces chemical waste, lowers the cost of chemicals in the sludge conditioning process, and ensures stable and reliable sludge treatment results.

[0038] Please refer to Figures 1 to 6 As shown, Embodiment 1 of this utility model is as follows: Please refer to Figure 1 and Figure 2 An integrated wastewater treatment device includes a high-density sedimentation tank 2, a denitrification biological filter 3, an ozone catalytic oxidation tower 4, a synchronous nitrification and denitrification filter 5, and a sludge conditioning tank 6, all integrated in the same housing 1 and connected in sequence. The sludge conditioning tank 6 is connected to the high-density sedimentation tank 2, the denitrification biological filter 3, and the synchronous nitrification and denitrification filter 5, respectively. The sludge conditioning tank 6 is used to collect water-containing sludge produced by the high-density sedimentation tank 2, the denitrification biological filter 3, and the simultaneous nitrification-denitrification filter 5.

[0039] Please refer to Figure 2 and Figure 3The denitrification biological filter 3 includes a filter body 31, which is divided into two types according to the hydraulic flow state: upflow and downflow. The upflow type denitrification filter is similar in shape to the traditional biological filter. That is, the filter body 31 is provided with a water distribution layer, a support layer, a packing layer and a clear water layer from bottom to top.

[0040] The downflow denitrification filter is similar in shape to the V-type filter structure, that is, the filter body 31 is provided with a water distribution zone 32, a packing zone 33, a support layer 34 and an effluent collection zone 35 from top to bottom.

[0041] The denitrification biological filter 3, as the core process unit for deep nitrogen removal from wastewater, is mainly used to remove nitrates (NO3). - The nitrogen gas is converted into nitrogen (N2) through denitrification, while simultaneously removing organic matter (requiring carbon source replenishment) and removing suspended solids to reduce effluent turbidity. The water distribution system (i.e., distribution zone 32) uses filter heads or perforated pipes to ensure uniform hydraulic distribution (distribution unevenness ≤5%); the backwashing system (i.e., packing zone 33) employs a combined air-water backwash (intensity: air 4~8 L / (m³)). 2 (·s), water 8~15 L / (m²·s)). The filter media in the support layer 34 can be ceramsite, activated carbon, etc., and sulfur autotrophic denitrification can also be adopted, using sulfur (S) 0 Using an electron donor, this process has the advantage of not requiring a carbon source, but the disadvantage is that acid production requires the addition of alkali to adjust the pH (usually by adding Ca(OH)2). Dissolved oxygen (DO) is controlled at DO < 0.5 mg / L (strictly anoxic environment).

[0042] The simultaneous nitrification-denitrification filter 5 can recover and utilize residual ozone to further remove small-molecule organic matter decomposed by ozone. The simultaneous nitrification-denitrification filter 5 includes a filter body 31, a porous biological support layer 34, a microporous aeration device, an intelligent DO control system, and a backwashing unit. The filter body 31 adopts an upward flow design and is filled with 3mm-5mm ceramic particles as a biological carrier, with a specific surface area ≥400m². 2 / m 3 The microporous aeration device, in conjunction with a variable frequency fan, enables precise control of dissolved oxygen (DO) within the range of 0.5 mg / L to 2.0 mg / L. The intelligent DO control system automatically adjusts the aeration rate through online monitoring and a PLC control system, creating an aerobic zone on the surface of the filter media to achieve nitrification and an anoxic microenvironment inside the filter media to achieve denitrification. The backwashing unit adopts a combined air-water backwashing mode, and the backwashing cycle is automatically triggered according to the pressure difference of the filter layer.

[0043] The sludge conditioning tank 6 is mainly used for homogenization and conditioning of sludge in the wastewater treatment system. The sludge conditioning tank 6 is a rectangular or circular reinforced concrete structure with an effective water depth of 3-5 meters and a retention time of 2-4 hours. It is equipped with a paddle mixer with a power of 2kW-3kW. During the sludge conditioning process, the following agents are mainly added: polyaluminum chloride (PAC, dosage 100mg / L-300mg / L) or aluminum sulfate as coagulants, and cationic polyacrylamide (PAM, dosage 3mg / L-8mg / L) as flocculants. When pH adjustment is required, lime (Ca(OH)2, dosage 0.5kg / m³) is added. 3 -2kg / m 3 Increase the pH, or add sulfuric acid (H2SO4, dosage 0.1 L / m³). 3 ~0.5L / m 3 The pH is lowered. The agent is added via a metering pump and mixed with the sludge to form a homogeneous mixture, facilitating subsequent concentration or dewatering treatment.

[0044] Please refer to Figure 2 and Figure 4 A buffer tank 7 is provided between the ozone catalytic oxidation tower 4 and the synchronous nitrification-denitrification filter 5. The buffer tank 7 is connected to the outlet of the ozone catalytic oxidation tower 4 and the inlet of the synchronous nitrification-denitrification filter 5, respectively.

[0045] Please refer to Figure 5 The buffer pool 7 is provided with multiple baffles 71 from top to bottom, and there is a gap between two adjacent baffles 71.

[0046] Multiple baffles 71 are staggered on opposite inner walls of the buffer pool 7.

[0047] The baffle plate 71 is provided with a baffle groove 711, and an ultraviolet light device 72 is provided inside the baffle groove 711. The ultraviolet light device 72 is wrapped with a waterproof layer.

[0048] A tail gas destruction device is connected between the outlet of the ozone catalytic oxidation tower 4 and the buffer tank 7.

[0049] Please refer to Figure 2 The ozone catalytic oxidation tower 4 is equipped with two ozone catalytic oxidation reactors 41, each of which is connected to the denitrification biological filter 3 and the synchronous nitrification-denitrification filter 5 respectively.

[0050] The ozone catalytic oxidation tower 4 decomposes large, recalcitrant organic molecules into smaller molecules (such as acetic acid and ketones), improving biodegradability; reduces the color intensity of peroxide chromogenic groups (such as azo bonds); and inactivates pathogenic microorganisms, ensuring subsequent biosafety. The ozone dosage is typically 30 mg / L to 100 mg / L (adjusted according to water quality), and the contact time is 10 to 30 minutes. Catalysts such as TiO2 and Fe can be selected. 2+ Ozone is catalyzed to enhance oxidation efficiency. The ozone catalytic oxidation reactor 41 is filled with a TiO2-MnO2 / Al2O3 catalyst. Ozone is added to the reactor 41 through a titanium alloy aerator, and the reaction time is 30-40 minutes. The outlet of the ozone catalytic oxidation reactor 41 is connected to a tail gas destruction device to prevent ozone leakage. To further improve the mass transfer efficiency of ozone in solution, micro-nano bubble technology can be used to enhance ozone catalytic oxidation. Micro-nano bubbles with diameters ranging from tens of nanometers to tens of micrometers have high internal pressure and rapid mass transfer efficiency, which can significantly improve gas solubility. The micro-nano bubbles generated by the pressurized dissolved gas release method in the container of the ozone catalytic oxidation reactor 41 have uniform particle size, with the bubble particle size mainly distributed at 437.3 nm and a Zeta potential of -28.11 mV (Zeta potential is the potential of the shear plane, also called electromotive force or electroelectric potential, which is an important indicator of the stability of colloidal dispersions). In the micro-nano bubble-enhanced ozone catalytic oxidation process, the ozone solubility reached 13.50 mg / L, more than twice that of traditional aeration. 1g of O3 (ozone) decomposes to generate approximately 0.6g of O2 (oxygen). Traditional ozone catalytic towers directly send ozone exhaust gas to the ozone decomposer, resulting in resource waste. Therefore, this solution, based on the extremely unstable chemical properties of ozone, incorporates a buffer tank 7 to ensure complete decomposition of ozone into O2. The resulting O2 is directly used in the subsequent nitrification / denitrification co-processing biological filter to reduce the energy consumption of mechanical aeration.

[0051] The effluent and exhaust gas from the ozone catalytic tower undergo further O3 decomposition and O2 release in a closed buffer tank 7 to ensure complete ozone decomposition before entering the biological tank (avoiding residual O3 that inhibits microbial activity). The half-life of ozone in water is typically 20-30 minutes (25°C, neutral pH). To shorten the decomposition time, this design incorporates multiple baffles 71 in the buffer tank 7 to increase the water residence time. Furthermore, baffle channels 711 are installed on the multiple baffles 71, and ultraviolet light devices 72 are placed on the baffle channels 711 to accelerate ozone decomposition, reducing the half-life to 5-8 minutes. Ultraviolet light (wavelength ≤254 nm) provides energy, causing ozone to photolyze into O2 and oxygen atoms; simultaneously, a pH control system is installed in the buffer tank 7 to control the pH value within the tank.

[0052] Please refer to Figure 2 and Figure 6 The housing 1 is also equipped with a plate and frame filter press 8, which is connected to the sludge conditioning tank 6.

[0053] The box 1 is also equipped with a chemical mixing tank 9, which is connected to the sludge conditioning tank 6.

[0054] Conditioning agents (such as PAM (polyacrylamide), PAC (polyaluminum chloride, also known as a water purification agent or coagulant), lime, etc.) are added to sludge conditioning tank 6. Stirring ensures thorough mixing of the agents with the sludge, improving dewatering performance. Sludge generated during the process is collected in sludge conditioning tank 6 for further dewatering. Through gravity settling (with static or mechanical stirring assistance), sludge conditioning tank 6 concentrates the water content of dilute sludge (above 99%) to 95%~97%, significantly reducing the volume of sludge entering the plate and frame filter press 8, lowering the processing load on the filter press, reducing the filtration cycle and filter cloth replacement frequency, and avoiding the "sludge run-out" phenomenon (turbid filtrate and poorly formed filter cake) caused by directly treating overly diluted sludge.

[0055] The recalcitrant organic wastewater first enters the high-density sedimentation tank 2 integrated within the same tank 1. Through coagulation and sedimentation, suspended solids and some easily settled pollutants are removed, reducing the ineffective consumption of suspended solids by the subsequent ozone catalytic oxidation unit, lowering the risk of clogging of the ozone unit's packing layer, and reducing the load on subsequent treatment units. Subsequently, the wastewater flows into the denitrification biological filter 3, where it is evenly distributed in the water distribution zone 32 of the filter body 31. The water flows through the packing zone 33 and into the support layer 34. Denitrifying microorganisms attached to the support layer 34 convert nitrates in the wastewater into nitrogen gas in an anaerobic environment, completing the removal of total nitrogen. Simultaneously, some suspended solids are retained, and small molecule organic matter is degraded. The treated wastewater is collected in the effluent collection zone 35 and then enters the ozone catalytic oxidation tower 4.

[0056] Wastewater is processed in two ozone catalytic oxidation reactors 41 within the ozone catalytic oxidation tower 4. Utilizing a TiO2-MnO2 / Al2O3 catalyst and micro / nano bubble technology (ozone is added via titanium alloy aerators), ozone mass transfer and catalytic oxidation reactions are enhanced, decomposing large, recalcitrant organic molecules into smaller ones, reducing wastewater color, and inactivating pathogenic microorganisms. The wastewater, carrying a small amount of residual ozone after the reaction, is first treated by a tail gas destruction device to remove residual ozone from the tail gas before entering the buffer tank 7. The staggered baffles 71 within the buffer tank 7 extend the water residence time, while the ultraviolet light device 72 (wavelength ≤254nm) within the baffle trough 71 accelerates the decomposition of ozone into oxygen, ensuring that no residual ozone enters the water in subsequent units.

[0057] The oxygen produced by decomposition enters the synchronous nitrification and denitrification filter tank 5 with the water flow. The 3mm~5mm ceramic filter media filled in the filter tank forms an aerobic zone on the surface and an anoxic zone inside. The intelligent DO control system precisely regulates dissolved oxygen through a variable frequency fan. Nitrification reaction is completed in the aerobic zone and denitrification reaction is completed in the anoxic zone, achieving deep denitrification and removal of small molecule organic matter simultaneously.

[0058] During the treatment process, the water-containing sludge produced by the high-density sedimentation tank 2, the denitrification biological filter 3, and the simultaneous nitrification and denitrification filter 5 all flow into the sludge conditioning tank 6. The reagent mixing tank 9 mixes the reagent evenly and then adds it to the sludge conditioning tank 6 to improve the sludge dewatering performance. Finally, the plate and frame filter press 8 dewaters the conditioned sludge. The entire system is automated through a PLC control system, covering water quality monitoring, reagent addition, sludge transfer, and other aspects to ensure stable effluent quality that meets standards.

[0059] In summary, the integrated wastewater treatment equipment provided by this utility model, by integrating a high-density sedimentation tank, a denitrifying biological filter, an ozone catalytic oxidation tower, a simultaneous nitrification-denitrification filter, and a sludge conditioning tank into a single enclosure, fundamentally solves the problems of dispersed, high-rise, and inconveniently mobile traditional ozone advanced oxidation combined equipment. It eliminates the need for a permanent base and can flexibly adapt to decentralized wastewater treatment scenarios with small discharge volumes, avoiding the high costs of long-distance water transportation and the uneconomical treatment of small volumes. By connecting the sludge conditioning tank to the high-density sedimentation tank, denitrifying biological filter, and simultaneous nitrification-denitrification filter respectively, it centrally collects the water-containing sludge produced by these components. This effectively avoids secondary pollution caused by multiple sludge piles, transfers, and leaks in traditional decentralized treatment, facilitating subsequent sludge dewatering and disposal. Furthermore, the equipment has a small overall footprint and low site requirements, further enhancing its adaptability to different application scenarios.

[0060] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent modifications made based on the content of this utility model specification and drawings, or direct or indirect applications in related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An integrated sewage treatment equipment, characterized in that, It includes a high-density sedimentation tank, a denitrification biological filter, an ozone catalytic oxidation tower, a synchronous nitrification-denitrification filter, and a sludge conditioning tank, all integrated in the same box and connected in sequence. The sludge conditioning tank is connected to the high-density sedimentation tank, the denitrification biological filter, and the synchronous nitrification-denitrification filter, respectively. The sludge conditioning tank is used to collect water-containing sludge produced by the high-density sedimentation tank, denitrification biological filter, and simultaneous nitrification-denitrification filter.

2. The integrated sewage treatment equipment according to claim 1, characterized in that, The denitrifying biological filter includes a filter body, which contains, from top to bottom, a water distribution area, a packing material area, a support layer, and an effluent collection area.

3. The integrated sewage treatment equipment according to claim 1, characterized in that, A buffer tank is provided between the ozone catalytic oxidation tower and the synchronous nitrification-denitrification filter. The buffer tank is connected to the outlet of the ozone catalytic oxidation tower and the inlet of the synchronous nitrification-denitrification filter.

4. The integrated sewage treatment equipment according to claim 3, characterized in that, The buffer pool is provided with multiple baffles from top to bottom, and there is a gap between two adjacent baffles.

5. The integrated sewage treatment equipment according to claim 4, characterized in that, Multiple baffles are staggered on opposite inner walls of the buffer pool.

6. The integrated sewage treatment equipment according to claim 4, characterized in that, The baffle plate is provided with a baffle groove, and an ultraviolet light device is provided in the baffle groove.

7. The integrated sewage treatment equipment according to claim 3, characterized in that, A tail gas destruction device is connected between the outlet of the ozone catalytic oxidation tower and the buffer tank.

8. The integrated sewage treatment equipment according to claim 1, characterized in that, The ozone catalytic oxidation tower is equipped with two ozone catalytic oxidation reactors, each of which is connected to a denitrification biological filter and a simultaneous nitrification-denitrification filter, respectively.

9. The integrated sewage treatment equipment according to claim 1, characterized in that, The chamber is also equipped with a plate and frame filter press, which is connected to the sludge conditioning tank.

10. The integrated sewage treatment equipment according to claim 1, characterized in that, The box is also equipped with a chemical mixing tank, which is connected to the sludge conditioning tank.

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