A deep oil and slag removal system for oily wastewater

Abstract

This utility model discloses a deep oil and slag removal system for oily wastewater, including a raw material storage unit, a raw material conveying unit, a treatment reaction unit, and a finished product temporary storage unit. The raw material storage unit is equipped with a storage space for storing raw materials. The raw material conveying unit is located at the front end of the treatment reaction unit. The treatment reaction unit is used for deep oil and slag removal from the oily wastewater. The treatment reaction unit includes an acid precipitation reaction device, an air flotation device, and a chemical dosing device. The oily wastewater is conveyed to the acid precipitation reaction device for acid precipitation reaction through the raw material conveying unit. The acid precipitation reaction device and the chemical dosing device are respectively connected to the air flotation device. The finished product temporary storage unit is located at the rear end of the treatment reaction unit. The technical solution of this utility model can remove oil from organic oily wastewater, thereby reducing the treatment difficulty and cost of the downstream treatment system. Furthermore, it simultaneously solves the problem of waste gas overflow during the treatment process, greatly improving the treatment efficiency of oily wastewater.

Description

Technical Field

[0001] This utility model relates to wastewater treatment technology, and in particular to a deep oil and slag removal system for oily wastewater. Background Technology

[0002] With the continuous expansion of the market, the amount of organic oily wastewater such as waste emulsions and cutting fluids collected has increased significantly. Currently, the main treatment for oily wastewater is the physicochemical treatment acid precipitation process. This method cannot completely remove the waste oil from oily wastewater. The accumulation of oil in a large amount of oily wastewater will have an adverse effect on the downstream evaporation, biochemical and membrane systems, increasing the difficulty and cost of treatment.

[0003] To further remove oil from organic oily wastewater and reduce the processing difficulty and cost of downstream treatment systems, this utility model proposes a deep oil and slag removal system for oily wastewater. Utility Model Content

[0004] The main purpose of this invention is to propose a deep oil and slag removal system for oily wastewater, which aims to solve the technical problems that existing oily wastewater treatment processes cannot completely remove the waste oil from oily wastewater, and that the accumulation of oil in large amounts of oily wastewater will have an adverse effect on downstream evaporation, biochemical and membrane systems, increasing the difficulty and cost of treatment.

[0005] To achieve the above objectives, the present invention proposes a deep oil and slag removal system for oily wastewater, comprising a raw material storage unit, a raw material conveying unit, a treatment reaction unit, and a finished product temporary storage unit. The raw material storage unit is equipped with a storage space for storing raw materials. The raw material conveying unit is located at the front end of the treatment reaction unit and includes a wastewater conveying pump, pipelines, and a ton container. The treatment reaction unit is used for deep oil and slag removal from the oily wastewater. The treatment reaction unit includes an acid precipitation reaction device, an air flotation device, and a chemical dosing device. The acid precipitation reaction device is connected to the raw material conveying unit, through which the oily wastewater is conveyed to the acid precipitation reaction device for acid precipitation reaction. The acid precipitation reaction device and the chemical dosing device are respectively connected to the air flotation device. The finished product temporary storage unit is located at the rear end of the treatment reaction unit and includes a small-mouth ton container for storing oil.

[0006] Furthermore, the air flotation device includes an air flotation mixing tank, a stirring motor, and a stirrer. The lower end of the air flotation mixing tank is provided with a water inlet, which is connected to the outlet of the wastewater conveying pump of the raw material conveying unit. The stirring motor is located at the upper end of the air flotation mixing tank, and the stirrer is rotatably installed inside the air flotation mixing tank. The output shaft of the stirring motor is connected to the upper end of the stirrer. The dosing device is located on one side of the air flotation mixing tank and is connected to the air flotation mixing tank.

[0007] Furthermore, the flotation device also includes a flotation tank body, an air compressor, a dissolved air tank, a mixer, and a sludge scraper. The flotation tank body is connected to the flotation mixing tank. The air compressor is located on one side of the flotation tank body. The dissolved air tank and the sludge scraper are located at the upper end of the flotation tank body. The air compressor is connected to the dissolved air tank. The dissolved air tank is connected to the flotation tank body via a dissolved air pump. The upper end of the flotation tank body is provided with a steam interface, which is connected to a steam generating device. The sludge scraper collects the floating oil in the flotation tank body into a small-mouth tonne container for temporary storage. The mixer is located inside the flotation tank body.

[0008] Furthermore, the flotation device also includes a flotation outlet tank and a tubular regulating weir. The flotation outlet tank is connected to the flotation tank via the tubular regulating weir. The tubular regulating weir is used to transport the floating oil in the flotation outlet tank to the flotation tank. The lower end of the flotation outlet tank is provided with an outlet.

[0009] The technical solution of this utility model has the following beneficial effects: The technical solution of this utility model effectively removes oil from oily wastewater by combining steam heating and dissolved air flotation, and this oil can be collected again and reused, truly turning waste into treasure. It can reduce the processing difficulty and cost of the back-end treatment system, and at the same time solve the problem of waste gas overflow during the reaction process, greatly improving the treatment efficiency of oily wastewater. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overall framework structure of an oily wastewater deep oil and slag removal treatment system according to an embodiment of the present invention;

[0012] Figure 2 This is a schematic diagram of the overall frame structure of the treatment reaction unit of an oily wastewater deep oil and slag removal treatment system according to an embodiment of the present invention.

[0013] Figure 3 This is a schematic diagram of the air flotation device of the treatment reaction unit of an oily wastewater deep oil and slag removal treatment system according to an embodiment of the present invention.

[0014] Figure 4 This is a schematic diagram of the air flotation device of the treatment reaction unit of an oily wastewater deep oil and slag removal treatment system according to an embodiment of the present invention.

[0015] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0018] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0019] This invention proposes a deep oil and slag removal system for oily wastewater.

[0020] like Figures 1 to 4As shown in one embodiment of this utility model, the deep oil and slag removal system for oily wastewater includes a raw material storage unit 100, a raw material conveying unit 200, a treatment reaction unit 300, and a finished product temporary storage unit 400. The raw material storage unit 100 is provided with a storage space for storing raw materials. The raw material conveying unit 200 is located at the front end of the treatment reaction unit 300 and includes a wastewater conveying pump, pipelines, and a container. The treatment reaction unit 300 is used for deep oil and slag removal from the oily wastewater. The treatment unit 300 includes an acid precipitation reaction device 301, an air flotation device 302, and a chemical dosing device 303. The acid precipitation reaction device 301 is connected to the raw material conveying unit 200. The oily wastewater is conveyed to the acid precipitation reaction device 301 for acid precipitation reaction through the raw material conveying unit 200. The acid precipitation reaction device 301 and the chemical dosing device 303 are respectively connected to the air flotation device 302. The finished product temporary storage unit 400 is located at the rear end of the treatment reaction unit 300. The finished product temporary storage unit 400 includes small-mouth ton containers for storing oil.

[0021] Specifically, the air flotation device 302 includes an air flotation mixing tank 3021, a stirring motor 3022, and a stirrer 3023. The lower end of the air flotation mixing tank 3021 is provided with a water inlet 3024, which is connected to the outlet of the wastewater conveying pump of the raw material conveying unit 200. The stirring motor 3022 is located at the upper end of the air flotation mixing tank 3021. The stirrer 3023 is rotatably installed inside the air flotation mixing tank 3021. The output shaft of the stirring motor 3022 is connected to the upper end of the stirrer 3023. The dosing treatment device 303 is located on one side of the air flotation mixing tank 3021 and is connected to the air flotation mixing tank 3021.

[0022] Specifically, the flotation device 302 also includes a flotation tank body 3025, an air compressor 3026, a dissolved air tank 3027, a mixer (not shown), and a sludge scraper 3028. The flotation tank body 3025 is connected to the flotation mixing tank 3021. The air compressor 3026 is located on one side of the flotation tank body 3025. The dissolved air tank 3027 and the sludge scraper 3028 are located at the upper end of the flotation tank body 3025. The air compressor 3026 is connected to the dissolved air tank 3027. The dissolved air tank is connected to the flotation tank body 3025 through the dissolved air pump 3027. The upper end of the flotation tank body 3025 is provided with a steam interface 3029, which is connected to a steam generating device. The floating oil in the flotation tank body 3025 is collected into a small-mouth ton container for temporary storage by the scraper of the sludge scraper 3028. The mixer is located inside the flotation tank body 3025.

[0023] Specifically, the flotation device 302 also includes a flotation effluent tank 30210 and a tubular regulating weir 30211. The flotation effluent tank 30210 is connected to the flotation tank 3025 through the tubular regulating weir 30211. The tubular regulating weir 30211 is used to transport the floating oil in the flotation effluent tank 30210 to the flotation tank 3025 to further remove the oil from the organic oily wastewater. The lower end of the flotation effluent tank 30211 is provided with an outlet 30212.

[0024] Specifically, dissolved air flotation (DAF) utilizes the characteristic that water has different solubilities under different pressures. Under pressurized or negative pressure conditions, microbubbles are generated in the water, replacing the traditional air-drawing equipment used for flotation. The working principle of DAF is as follows: Air from an air compressor is delivered to an air tank and then carried into the dissolved air tank via a jet device. Under a pressure of 0.35 MPa, the air is forcibly dissolved in the water to form dissolved air water, which is then sent to the flotation tank. Upon sudden release, the dissolved air in the water precipitates out, forming a large number of microbubbles. These microbubbles come into full contact with the suspended solids in the pumped wastewater that are undergoing flocculation after chemical dosing. During their slow ascent, the microbubbles are adsorbed onto the flocculated suspended solids, causing their density to decrease and allowing them to float to the surface. This achieves the purpose of removing oil from oily wastewater and thus purifying the water.

[0025] Specifically, the working principle and process of this utility model are as follows:

[0026] The oily wastewater is first subjected to an acid precipitation reaction in the treatment reaction unit. After the acid precipitation reaction, the oily wastewater is pumped to the air flotation mixing tank (first-stage reaction tank) of the treatment reaction unit for further oil and slag removal. During the reaction in the air flotation mixing tank, the pH value of the wastewater is adjusted to 5-6. Then, flocculant is added to the air flotation mixing tank through a chemical dosing device. The wastewater after the reaction enters the air flotation tank (second-stage reaction tank). Steam is introduced into the air flotation tank for heating and reaction, and the agitator is started at the same time. The heating increases the temperature of the oily wastewater, reduces the viscosity coefficient of the water, thereby reducing the resistance to oil droplet movement, increasing the movement speed, increasing the chance of collision between them, and making them easier to aggregate. The process involves removing large oil droplets by floating them to the surface. Simultaneously, a dissolved air flotation tank is activated for dissolved air flotation. The floating oil produced during the reaction is collected by a scraper into a small-mouthed tonne tank, allowing for the recycling of waste oil and effectively reducing resource waste. The treated wastewater then enters the flotation effluent tank, where a pipe weir transports the floating oil to the flotation pool for further oil removal. This process reduces the difficulty and cost of downstream treatment systems and simultaneously addresses the issue of waste gas overflow during the reaction, significantly improving the efficiency of oily wastewater treatment.

[0027] This utility model has the following advantages:

[0028] This invention effectively removes grease from oily wastewater by combining steam heating with dissolved air flotation. The grease can be collected again and reused, truly turning waste into treasure.

[0029] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An oil-containing wastewater advanced oil and sludge removal treatment system, characterized in that, The system includes a raw material storage unit, a raw material conveying unit, a treatment and reaction unit, and a finished product temporary storage unit. The raw material storage unit is equipped with storage space for storing raw materials. The raw material conveying unit is located at the front end of the treatment and reaction unit and includes a wastewater conveying pump, pipelines, and ton containers. The treatment and reaction unit is used for deep oil and slag removal from oily wastewater. The treatment and reaction unit includes an acid precipitation reaction device, an air flotation device, and a chemical dosing device. The acid precipitation reaction device is connected to the raw material conveying unit, and the oily wastewater is conveyed to the acid precipitation reaction device for acid precipitation reaction through the raw material conveying unit. The acid precipitation reaction device and the chemical dosing device are respectively connected to the air flotation device. The finished product temporary storage unit is located at the rear end of the treatment and reaction unit and includes small-mouth ton containers for storing oil.

2. The deep oil and slag removal system for oily wastewater according to claim 1, characterized in that, The air flotation device includes an air flotation mixing tank, a stirring motor, and a stirrer. The lower end of the air flotation mixing tank is provided with a water inlet, which is connected to the outlet of the wastewater conveying pump of the raw material conveying unit. The stirring motor is located at the upper end of the air flotation mixing tank. The stirrer is rotatably installed inside the air flotation mixing tank. The output shaft of the stirring motor is connected to the upper end of the stirrer. The dosing device is located on one side of the air flotation mixing tank and is connected to the air flotation mixing tank.

3. The deep oil and slag removal system for oily wastewater according to claim 2, characterized in that, The flotation device further includes a flotation tank body, an air compressor, a dissolved air tank, a mixer, and a sludge scraper. The flotation tank body is connected to the flotation mixing tank. The air compressor is located on one side of the flotation tank body. The dissolved air tank and the sludge scraper are located at the upper end of the flotation tank body. The air compressor is connected to the dissolved air tank. The dissolved air tank is connected to the flotation tank body via a dissolved air pump. The upper end of the flotation tank body is provided with a steam interface, which is connected to a steam generating device. The sludge scraper collects the floating oil in the flotation tank body into a small-mouth tonne container for temporary storage. The mixer is located inside the flotation tank body.

4. The deep oil and slag removal system for oily wastewater according to claim 3, characterized in that, The flotation device further includes a flotation outlet tank and a tubular regulating weir. The flotation outlet tank is connected to the flotation tank via the tubular regulating weir. The tubular regulating weir is used to transport the floating oil in the flotation outlet tank to the flotation tank. The lower end of the flotation outlet tank is provided with an outlet.

Images