Ozone catalytic oxidation salt-containing wastewater treatment system

Abstract

An ozone catalytic oxidation salt-containing sewage treatment system, comprising a raw water inlet, characterized in that the raw water metal enters a regulating tank through a grid, the regulating tank is connected with a primary sedimentation tank, the primary sedimentation tank is connected with a micro-nano air flotation tank, the micro-nano air flotation tank is connected with a diatomite microfiltration device, the primary sedimentation tank, the micro-nano air flotation tank and the diatomite microfiltration device are simultaneously connected with a solid residue collection tank; a liquid outlet of the diatomite microfiltration device is connected with a first aerobic tank, the first aerobic tank is sequentially connected with a first anoxic denitrification tank, a second aerobic tank, a second anoxic denitrification tank and a terminal sedimentation tank, the terminal sedimentation tank is connected with the primary sedimentation tank through one pipeline and with an MBR membrane filtration device through another pipeline, the above-mentioned devices form a first set of system, a second set of system is the same as the first set of system, water outlets of the MBR membrane filtration devices of the two sets of systems are respectively connected with two ozone reaction tanks; the solid residue collection tanks of the two sets of systems are connected with a liquid fertilizer manufacturing tank. Through a micro-nano aeration system and a microbial agent, COD, BOD, total phosphorus, inorganic nitrogen, non-ionic ammonia, ss and other indexes are efficiently degraded, at the same time, an ozone catalytic oxidation process is combined to promote the reaction between ozone and organic matters, thereby enhancing the oxidation effect and realizing three types of seawater reaching the discharge standard.

Description

Technical Field

[0001] This utility model belongs to the field of wastewater treatment technology, specifically relating to an ozone catalytic oxidation system for treating saline wastewater. Background Technology

[0002] The combined wastewater mainly includes dock washing and trading wastewater, cold storage wastewater, and oily wastewater after oil separation. Investigations show that the combined wastewater from dock washing and trading, trading hall wastewater, and cold storage mainly originates from washing fish, trading areas, cleaning ships, and some initial rainwater. The wastewater contains grease, fish skin, fish scraps, fish viscera, oil, fine suspended solids, and animal fats, and has a high salt content. Furthermore, with the opening and operation of the fishing port, the environmental impact caused by sewage and garbage generated from fish product trading and washing within the port area, domestic sewage, oil, garbage, ship washing water, ballast water from ships and fishermen in the port basin, and the fishy odors from fish product trading are becoming increasingly serious.

[0003] Ozone oxidation technology utilizes ozone as a strong oxidant to oxidize organic or inorganic substances in water or wastewater, achieving disinfection, oxidation, or decolorization. Ozone has a strong oxidizing ability, reacting rapidly to generate ozonides, thereby effectively removing pollutants from water.

[0004] Ozone oxidation technology is widely used in water treatment, primarily to remove pollutants such as chemical oxygen demand (COD), biochemical oxygen demand (BOD), phenols, cyanides, iron, and manganese from water. It also provides deodorization, decolorization, sterilization, and disinfection. Because ozone reacts rapidly, requires small amounts, is easily produced locally, and causes no secondary pollution, it has been widely used in environmental protection and chemical production. Summary of the Invention

[0005] To overcome the shortcomings of the existing technology, the purpose of this utility model is to provide an ozone catalytic oxidation saline wastewater treatment system. This system consists of two parallel wastewater treatment systems with dual aerobic aeration and anoxic denitrification treatments. Through a micro-nano aeration system and microbial agents, it efficiently degrades indicators such as COD, BOD, total phosphorus, inorganic nitrogen, non-ionic ammonia, and SS. Simultaneously, the ozone catalytic oxidation process promotes the reaction between ozone and organic matter, thereby enhancing the oxidation effect and achieving Class III seawater discharge compliance.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An ozone catalytic oxidation saline wastewater treatment system includes raw water influent. The raw water, containing metals, enters a regulating tank through a screen. The regulating tank is connected to a primary sedimentation tank, which is then connected to a micro-nano air flotation tank. The micro-nano air flotation tank is connected to a diatomaceous earth microfiltration device. The primary sedimentation tank, the micro-nano air flotation tank, and the diatomaceous earth microfiltration device are all connected to a solids collection tank. The outlet of the diatomaceous earth microfiltration device is connected to a first aerobic tank. The first aerobic tank is sequentially connected to a first anoxic denitrification tank, a second aerobic tank, a second anoxic denitrification tank, and a final sedimentation tank. One pipeline from the final sedimentation tank connects to the primary sedimentation tank, and another pipeline passes through an MBR membrane filtration device. These devices constitute a first system. A second system is identical to the first system. The outlets of the MBR membrane filtration devices in both systems are respectively connected to two ozone reaction tanks. The solids collection tanks of both systems are connected to a liquid fertilizer production tank.

[0008] The raw water inlet is initially equipped with two screens: a fine screen and a medium screen.

[0009] The aforementioned micro-nano air flotation tank is equipped with a micro-nano aeration device, a slag scraper, and a lift pump.

[0010] The first and second aerobic tanks are equipped with micro-nano aeration devices.

[0011] The first and second anoxic denitrification tanks are equipped with circulation pumps and microbial inlets.

[0012] The terminal sedimentation tank is equipped with a reflux pump.

[0013] The liquid fertilizer manufacturing tank is equipped with a micro-nano aeration device.

[0014] The ozone reaction tank is equipped with an ozone generator and a micro-nano aeration device.

[0015] The ozone reaction tank employs an ozone catalytic oxidation process, which, based on the ozone process, adds a catalyst to promote the reaction between ozone and organic matter.

[0016] The catalyst is:

[0017] Metal oxide catalysts: mainly transition metal oxides, which enhance oxidation capacity by donating electrons to ozone, converting it into more active hydroxyl radicals (·OH). At the same time, metal oxide catalysts can also be adsorbed on the surface of organic matter to increase the reaction rate between organic matter and ozone, namely MnO2 and CeO2.

[0018] Composite oxide catalysts: composed of multiple metal oxides, through the synergistic effect between different metal elements, i.e., Fe-Mn system catalysts;

[0019] Organic-inorganic composite catalyst: using polymer-encapsulated metal oxide nanoparticles as catalysts.

[0020] The beneficial effects of this utility model are:

[0021] 1. No chemical flocculants are used; all sludge and suspended solids are recycled to make organic liquid fertilizer.

[0022] 2. The pretreatment stage removes suspended solids from the sludge, while the two subsequent A / O treatment stages reduce the load and improve the efficiency.

[0023] 3. Using aerobic bacteria QS1 and denitrifying bacteria QV1 that have been acclimatized to seawater, the treatment efficiency is high;

[0024] 4. After two A / O stages and a final sedimentation tank, the system undergoes micro-nano aeration and ozone treatment to achieve full compliance with standards.

[0025] 5. Operating costs are lower than conventional processes;

[0026] 6. Two sewage treatment systems are connected in parallel to reduce operating costs;

[0027] 7. High reliability: High-density packing + highly efficient denitrifying bacteria QV1 can efficiently denitrify the nitrate nitrogen produced in the aerobic section into nitrogen gas, effectively removing inorganic nitrogen. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the system structure of this utility model. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0030] like Figure 1 As shown, an ozone catalytic oxidation saline wastewater treatment system includes raw water influent. The raw water, containing metals, enters an equalization tank through a screen. The equalization tank is connected to a primary sedimentation tank, which is then connected to a micro-nano air flotation tank. The micro-nano air flotation tank is connected to a diatomaceous earth microfiltration device. The primary sedimentation tank, micro-nano air flotation tank, and diatomaceous earth microfiltration device are all connected to a solids collection tank. The outlet of the diatomaceous earth microfiltration device is connected to a first aerobic tank. The first aerobic tank is sequentially connected to a first anoxic denitrification tank, a second aerobic tank, a second anoxic denitrification tank, and a final sedimentation tank. One pipeline from the final sedimentation tank connects to the primary sedimentation tank, and another pipeline passes through an MBR membrane filtration device. These devices constitute the first system. The second system is identical to the first system. The outlets of the MBR membrane filtration devices in both systems are connected to two ozone reaction tanks, respectively. The solids collection tanks of both systems are connected to a liquid fertilizer production tank.

[0031] The raw water inlet is initially equipped with two screens: a fine screen and a medium screen.

[0032] The aforementioned micro-nano air flotation tank is equipped with a micro-nano aeration device, a slag scraper, and a lift pump.

[0033] The first and second aerobic tanks are equipped with micro-nano aeration devices.

[0034] The first and second anoxic denitrification tanks are equipped with circulation pumps and microbial inlets.

[0035] The terminal sedimentation tank is equipped with a reflux pump.

[0036] The liquid fertilizer manufacturing tank is equipped with a micro-nano aeration device.

[0037] The ozone reaction tank is equipped with an ozone generator and a micro-nano aeration device.

[0038] The ozone reaction tank employs an ozone catalytic oxidation process, which, based on the ozone process, adds a catalyst to promote the reaction between ozone and organic matter.

[0039] The catalyst is:

[0040] Metal oxide catalysts: mainly transition metal oxides, which enhance oxidation capacity by donating electrons to ozone, converting it into more active hydroxyl radicals (·OH). At the same time, metal oxide catalysts can also be adsorbed on the surface of organic matter to increase the reaction rate between organic matter and ozone, namely MnO2 and CeO2.

[0041] Composite oxide catalysts: composed of multiple metal oxides, through the synergistic effect between different metal elements, i.e., Fe-Mn system catalysts;

[0042] Organic-inorganic composite catalyst: using polymer-encapsulated metal oxide nanoparticles as catalysts. Example

[0043] The construction of the sewage treatment plant at Yazhou Central Fishing Port will treat sewage generated from washing fish at the dock and from fishmeal production. The treatment capacity is 2500 m³ / d, and the effluent quality will meet the Class III seawater quality standards.

[0044] The equalization tank, the initial sedimentation tank, and the micro-nano air flotation tank are underground water tanks with a net depth of 3 meters.

[0045] The aerobic tank 1, the aerobic-anoxic denitrification tank 2, the aerobic tank 3, the anoxic denitrification tank 4, and the final sedimentation tank are all underground water tanks with a net depth of 5 meters. The monitoring room, equipment room, and power distribution room are located on the ground floor with a floor height of 5 meters.

[0046] Discharge plan: A pressurized pipeline network will be used, with exhaust wells at the highest points of the pipeline, sludge discharge wells at the lowest points, and pressure relief wells near the discharge outlets. The wastewater will be discharged into the sea through gravity pipes.

[0047] Pipe material selection: The wastewater discharge of this project is a pressure pipe, and PE pipe is recommended. This section of drainage uses a DN150 pressure pipe with a length of 1300m. A pressure relief well is built at the end to release the pressure, and then it is discharged into the sea through a gravity pipe (Krall pipe).

[0048] The expected parameters after system processing are shown in the table below.

[0049]

[0050] In summary, the construction of the Yazhou Central Fishing Port Wastewater Treatment Plant will treat the saline wastewater generated by the central fishing port, reduce pollutant emissions, ensure the environmental quality within the central fishing port area, and thus play a leading role in environmental protection in the surrounding areas, ensuring better development of the Yazhou region. It will reduce CODcr emissions by 172,280 kg annually, NH3-N emissions by 35,916 kg annually, and P emissions by 9,030 kg annually.

Claims

1. An ozone catalytic oxidation system for treating saline wastewater, comprising raw water influent, characterized in that, Raw water containing metal enters the equalization tank through a screen. The equalization tank is connected to the primary sedimentation tank, which is then connected to a micro-nano air flotation tank. The micro-nano air flotation tank is connected to a diatomaceous earth microfiltration device. The primary sedimentation tank, the micro-nano air flotation tank, and the diatomaceous earth microfiltration device are all connected to a solids collection tank. The outlet of the diatomaceous earth microfiltration device is connected to the first aerobic tank. The first aerobic tank is sequentially connected to the first anoxic denitrification tank, the second aerobic tank, the second anoxic denitrification tank, and the final sedimentation tank. One pipeline from the final sedimentation tank is connected to the primary sedimentation tank, and the other pipeline passes through an MBR membrane filtration device. The above equipment constitutes the first system. The second system is the same as the first system. The outlets of the MBR membrane filtration devices in both systems are connected to two ozone reaction tanks, respectively. The solids collection tanks of both systems are connected to a liquid fertilizer production tank.

2. The ozone catalytic oxidation saline wastewater treatment system according to claim 1, characterized in that, The raw water inlet is initially equipped with two screens: a fine screen and a medium screen.

3. The ozone catalytic oxidation saline wastewater treatment system according to claim 1, characterized in that, The micro-nano air flotation tank is equipped with a micro-nano aeration device, a slag scraper, and a lift pump.

4. The ozone catalytic oxidation saline wastewater treatment system according to claim 1, characterized in that, The first and second aerobic tanks are equipped with micro-nano aeration devices.

5. The ozone catalytic oxidation saline wastewater treatment system according to claim 1, characterized in that, The first and second anoxic denitrification tanks are equipped with circulation pumps and microbial inlets.

6. The ozone catalytic oxidation saline wastewater treatment system according to claim 1, characterized in that, The terminal sedimentation tank is equipped with a reflux pump.

7. The ozone catalytic oxidation saline wastewater treatment system according to claim 1, characterized in that, The liquid fertilizer manufacturing tank is equipped with a micro-nano aeration device.

8. The ozone catalytic oxidation saline wastewater treatment system according to claim 1, characterized in that, The ozone reaction tank is equipped with an ozone generator and a micro-nano aeration device.

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