A device for oil removal pretreatment

Abstract

The utility model provides a kind of oil removal pretreatment device, including oil removal pool body, the inside of oil removal pool body pool is divided into air floatation separation zone, oil collection area, baffle felt area in turn according to water flow direction;Air floatation separation zone is sequentially provided with slow flow tank, air floatation machine release ware, several staggered and vertical arrangement's spoiler according to water flow direction, air floatation machine release ware is connected with air floatation machine by pipeline;Oil collection area is sequentially provided with oil scraping device, vertical oil collection plate, first oil collection groove, vertical oil separation plate according to water flow direction;Baffle felt area is provided with several up-down staggered arrangement and vertical's pull-out plate type oil separation felt at intervals, the upper portion of baffle felt area is also provided with second oil collection groove.The utility model of a kind of oil removal pretreatment device adopts air floatation-heating-adsorption oil removal combined process, can effectively remove emulsified oil and small particle suspended oil, and the oil content of effluent is low.

Description

Technical Field

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

[0002] Kitchen waste leachate has a high oil content, sometimes reaching tens of thousands of mg / L. Leachate treatment plants typically accept wastewater with oil concentrations between 30-100 mg / L. If this level exceeds the acceptable limit, the anaerobic tanks and biological systems will block the wastewater from contact with air, causing a large-scale death of the microorganisms within the treatment plant. Therefore, oil separation pretreatment is necessary to remove floating oil and ensure the stable operation of the leachate treatment plant.

[0003] Conventional treatment processes include air flotation, gravity separation, and a simple combination of gravity and air flotation. However, these processes can only remove floating oil and large suspended oil particles. They have a very low treatment rate for emulsified oil and small suspended oil particles. These two types of oil easily float on the water surface after entering the leachate treatment plant, which seriously affects the stability of the leachate treatment plant's operation. Utility Model Content

[0004] This invention proposes an oil removal pretreatment device, which solves the problem of low treatment rate of emulsified oil and small particulate suspended oil in landfill leachate wastewater by existing oil removal equipment.

[0005] The specific technical solution of this utility model is as follows: An oil removal pretreatment device includes an oil removal tank. The interior of the tank is divided into an air flotation separation zone, an oil collection zone, and a baffled oil mat zone, arranged sequentially according to the water flow direction. Within the air flotation separation zone, a flow-slowing trough, an air flotation machine release device, and several staggered, vertically arranged baffles are arranged sequentially according to the water flow direction. The flow-slowing trough is located at the upper part of the air flotation separation zone, with an inlet above it and a distribution outlet at its bottom. The air flotation machine release device is located at the bottom of the air flotation separation zone and is connected to an air flotation machine via a pipe. Within the oil collection zone, an oil scraping device, a vertical oil collecting plate, a first oil collection trough, and a vertical oil separating plate are arranged sequentially according to the water flow direction. A water flow channel exists between the oil collecting plate and the oil separating plate and the inner bottom surface of the oil removal tank. The oil scraping device scrapes floating oil onto the oil collecting plate and the oil separating plate. On the liquid surface, the upper end face of the first oil collecting trough is an open end face, and the first oil collecting trough is connected to the first oil drain pipe. A heating device and a thermometer are also installed between the oil collecting plate and the oil separating plate. Several vertically arranged, staggered, and vertically aligned pull-out type oil separating felts are arranged at intervals in the baffle oil felt area. A second oil collecting trough is also provided at the upper part of the baffle oil felt area. The second oil collecting trough is connected to the second oil drain pipe. A water level trough is also provided at the end of the baffle oil felt area. The upper end face of the water level trough is an open end face, and the water level trough is connected to the water outlet pipe. The upper end faces of the first oil collecting trough and the second oil collecting trough are higher than the upper end face of the water level trough. The upper ends of the oil collecting plate and the oil separating plate are both higher than the upper end face of the water level trough. The upper end of the tall pull-out type oil separating felt is higher than the upper end face of the water level trough, and the upper end of the short pull-out type oil separating felt is lower than the upper end face of the water level trough.

[0006] Furthermore, the inlet is connected to an inlet pipe, which is connected to a booster pump used to suck up sewage.

[0007] Furthermore, a flow meter and a control valve are connected to the water inlet pipe.

[0008] Furthermore, the upper end face of the slow-flow groove is an open end face.

[0009] Furthermore, the adjacent spoilers are staggered vertically and horizontally.

[0010] Furthermore, a vent is provided at the bottom of the oil collection area.

[0011] Furthermore, the oil scraping device includes an oil scraping motor, the shaft of which is connected to an oil scraping shaft via a coupling, and an oil scraping plate is connected to the oil scraping shaft.

[0012] Furthermore, both the first and second oil collection troughs are isosceles trapezoidal troughs, while both the slow-flow trough and the water level trough are rectangular troughs.

[0013] Furthermore, the upper end of the oil removal tank is an open opening, and several movable cover plates are provided on the open opening.

[0014] Furthermore, a handle is fixed to the movable cover plate, and an exhaust port is also provided on the movable cover plate above the air flotation separation zone.

[0015] The beneficial effects of this utility model are as follows: The oil removal pretreatment device of this utility model adopts a combination process of air flotation-heating-adsorption oil removal, which can effectively remove emulsified oil and small particulate suspended oil, resulting in low oil content in the effluent. Attached Figure Description

[0016] 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 these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the internal structure of the oil removal tank in this utility model; Figure 2 for Figure 1 Sectional view along line AA; Figure 3 This is a top view of the oil removal tank in this utility model. Figure 4 This is a schematic diagram of the structure of this utility model.

[0018] The image includes the following symbols: Oil removal tank body 1; Air flotation separation zone 11, slow flow tank 111, air flotation machine release device 112, baffle plate 113, water inlet 114, water distribution port 115, air flotation machine 116, movable cover plate 117, exhaust port 118. Oil collection area 12, oil scraping device 121, oil collection plate 122, first oil collection trough 123, oil separating plate 124, first oil drain pipe 125, heating device 126, temperature gauge 127, vent 128. 13 baffle oil-water barrier, 131 pull-out oil-water barrier, 132 second oil collection tank, 133 second oil discharge pipe, 134 water level tank, 135 water outlet pipe. Water inlet pipe 21, booster pump 22, flow meter 23, control valve 24. Detailed Implementation

[0019] 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.

[0020] Reference Figure 1-4 An oil removal pretreatment device includes an oil removal tank body 1. The interior of the oil removal tank body is divided into an air flotation separation zone 11, an oil collection zone 12, and a baffle oil felt zone 13 in the direction of water flow.

[0021] Within the air flotation separation zone 11, a flow-slowing trough 111, an air flotation machine releaser 112, and several staggered and vertically arranged baffles 113 are arranged sequentially according to the water flow direction. The flow-slowing trough 111 is located at the upper part of the air flotation separation zone 11, and an inlet 114 is provided above the flow-slowing trough 111. A water distribution port 115 is provided at the bottom of the flow-slowing trough 111. The air flotation machine releaser 112 is located at the bottom of the air flotation separation zone 11, and the air flotation machine releaser 112 is connected to the air flotation machine 116 through a pipe.

[0022] The oil collection area 12 is arranged in sequence according to the water flow direction, including an oil skimming device 121, a vertical oil collecting plate 122, a first oil collection trough 123, and a vertical oil separating plate 124. The oil collecting plate 122 and the oil separating plate 124 form a water flow channel with the inner bottom surface of the oil removal tank body 1. The oil skimming device 121 is used to scrape the floating oil onto the liquid surface between the oil collecting plate 122 and the oil separating plate 124. The upper end face of the first oil collection trough 123 is an open end face. The first oil collection trough 123 is connected to a first oil discharge pipe 125. A heating device 126 and a thermometer 127 are also arranged between the oil collecting plate 122 and the oil separating plate 124.

[0023] The baffled oil felt area 13 is provided with several vertically arranged, staggered oil-separating sheets 131. The upper part of the baffled oil felt area 13 is also provided with a second oil collection trough 132, which is connected to a second oil discharge pipe 133. The end of the baffled oil felt area 13 is also provided with a water level trough 134, the upper end face of which is an open end face, and the water level trough 134 is connected to a water outlet pipe 135.

[0024] The upper surfaces of the first oil collection trough 123 and the second oil collection trough 132 are slightly higher than the upper surface of the water level trough 134. The upper surfaces of the oil collecting plate 122 and the oil separating plate 124 are both higher than the upper surface of the water level trough 134. The upper surface of the oil collecting plate 122 is slightly higher than the upper surface of the water level trough 134. The upper surface of the oil separating plate 124 is higher than the upper surface of the oil collecting plate 122. The height of the water distribution port 115 is slightly higher than or equal to the upper surface of the water level trough 134. The upper surface of the tall pull-out oil separating felt 131 is higher than the upper surface of the water level trough. The upper surface of the short pull-out oil separating felt 131 is lower than the upper surface of the water level trough 134.

[0025] In a preferred embodiment, the inlet 114 is connected to an inlet pipe 21, which is connected to a booster pump 22 for sucking up sewage. A flow meter 23 and a control valve 24 are connected to the inlet pipe 21.

[0026] As a preferred embodiment, the upper end face of the flow-slowing channel 111 is an open end face, the first oil collection channel 123 and the second oil collection channel 132 are both isosceles trapezoidal channels, the flow-slowing channel 111 and the water level channel 134 are both rectangular channels, and the adjacent baffles 113 are staggered vertically and horizontally.

[0027] As a preferred embodiment, the bottom of the oil collection area 12 is provided with a vent 128. After the oil collection area 12 has been running for a certain period of time, sludge will appear and can be discharged and cleaned periodically through the vent 128.

[0028] In a preferred embodiment, the oil scraping device 121 includes an oil scraping motor, the shaft of which is connected to an oil scraping shaft via a coupling, and an oil scraping plate is connected to the oil scraping shaft.

[0029] As a preferred embodiment, the upper end of the oil removal tank 1 is an open opening, and a plurality of movable cover plates 117 are provided on the open opening. The movable cover plates 117 are fixed with handles, and the movable cover plates above the air flotation separation zone 11 are also provided with exhaust ports 118.

[0030] During work: The booster pump 22 transports oily wastewater through the inlet pipe 21 to the inlet 114. The oily wastewater enters the slow-flow tank 111 from the inlet 114. The oily wastewater in the slow-flow tank 111 flows into the air flotation separation zone 11 through the distribution port 115 until the water level reaches the height of the upper end of the water level tank 134. If water continues to enter the inlet 114, water will exit the water level tank 134 at the other end, achieving balance. Because the height of the distribution port 115 is slightly higher than or equal to the upper end of the water level tank 134, the oily wastewater in the slow-flow tank 111 slowly flows into the water in the air flotation separation zone 11 through the distribution port 115, which can avoid the water force from damaging the stability of the water layer in the air flotation separation zone 11, thus playing a buffering role. The air flotation unit 116 is used to draw air... The compressed air is then fed to the air flotation machine releaser 112. The compressed air is released at the bottom of the air flotation separation zone 11 through the releaser 112, forming microbubbles that accelerate the rise of floating oil and large suspended oil particles. The baffle 113 prevents irregular flow of the microbubbles and also acts as a backflow deflector, extending the contact time between the microbubbles and the floating oil and large suspended oil particles, thus improving the oil removal effect. The floating oil and scum formed in the air flotation separation zone 11 are guided to the front end of the oil collection zone 12 by the baffle 113 and collected at the upper rear end of the oil collection zone 12 (between the oil collection plate and the oil separator) by the oil scraper 121. When the temperature is low, the floating oil clumps together, which is not conducive to its discharge and collection, and needs to be treated by the heater 126. The upper layer of floating oil is heated to liquefy the solid oil. The heater 126 is typically located above the oil collecting plate 122 and the oil separating plate 124 for more efficient heating of the upper oil layer. A temperature gauge 127 monitors the temperature. The oil collecting plate 122 divides the upper space of the oil collecting area 12 into a front and rear section. Its main function is to first concentrate the floating oil formed in the air flotation separation zone 11 at the front, then collect it at the rear section via the oil scraping device 121 for settling, facilitating unified discharge and collection. The oil separating plate 124 prevents the collected floating oil from flowing into the baffled oil felt chamber 13. When a certain amount of floating oil accumulates in the upper part of the oil collecting area 12, it is discharged outwards through the first oil collection trough 123 and the first oil discharge pipe 125. After the oil collection area 12 has been running for a certain period of time, sludge will appear. It can be periodically discharged and cleaned through the vent 128. When the oily wastewater passes through the pull-out grease trap 131, the grease trap 131 will adsorb the deemulsified oil and small particulate suspended oil. When the grease trap is saturated, it will form a baffle plate function, and the water level in the baffle grease area 13 will rise. The liquid level is used to determine whether the pull-out grease trap 131 needs to be replaced. When the floating oil on the liquid surface of the baffle grease area 13 accumulates to a certain amount, it will be discharged outward through the second oil collection tank 132 and the second oil discharge pipe 133. The treated wastewater flows evenly and steadily into the water level tank 134 and is discharged to the leachate treatment station for treatment through the water outlet pipe 135.

[0031] This utility model discloses an oil removal pretreatment device that adopts a combined process of air flotation-heating-adsorption oil removal, which can effectively remove emulsified oil and small particulate suspended oil, resulting in low oil content in the effluent, with the oil content index controlled below 100mg / L.

[0032] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An oil removal pretreatment device, characterized in that: It includes an oil removal tank, the interior of which is divided into an air flotation separation zone, an oil collection zone, and a baffle oil mat zone according to the water flow direction. The air flotation separation zone is arranged in sequence according to the water flow direction, including a slow flow trough, an air flotation machine release device, and several staggered and vertically arranged baffles. The slow flow trough is located at the top of the air flotation separation zone, with an inlet above it and a distribution outlet at the bottom. The air flotation machine release device is located at the bottom of the air flotation separation zone and is connected to the air flotation machine through a pipe. The oil collection area is arranged in sequence according to the water flow direction, including an oil skimming device, a vertical oil collecting plate, a first oil collection trough, and a vertical oil separating plate. The oil collecting plate and the oil separating plate are connected to the inner bottom surface of the oil removal tank as a water flow channel. The oil skimming device is used to scrape the floating oil onto the liquid surface between the oil collecting plate and the oil separating plate. The upper end face of the first oil collection trough is an open end face. The first oil collection trough is connected to a first oil discharge pipe. A heating device and a temperature gauge are also installed between the oil collecting plate and the oil separating plate. The baffled oil felt area is provided with several vertically arranged, staggered oil-separating sheets. The upper part of the baffled oil felt area is also provided with a second oil collection trough, which is connected to a second oil discharge pipe. The end of the baffled oil felt area is also provided with a water level trough, the upper end face of which is an open end face, and the water level trough is connected to a water outlet pipe. The upper surfaces of the first and second oil collection troughs are higher than the upper surface of the water level trough. The upper surfaces of the oil collecting plate and the oil separating plate are both higher than the upper surface of the water level trough. The upper surface of the tall pull-out oil separating felt is higher than the upper surface of the water level trough, while the upper surface of the short pull-out oil separating felt is lower than the upper surface of the water level trough.

2. The oil removal pretreatment device as described in claim 1, characterized in that: The inlet is connected to an inlet pipe, which in turn is connected to a booster pump used to suck up sewage.

3. The oil removal pretreatment device as described in claim 2, characterized in that: A flow meter and a control valve are connected to the water inlet pipe.

4. The oil removal pretreatment device as described in claim 1, characterized in that: The upper end face of the slow-flow groove is an open end face.

5. The oil removal pretreatment device as described in claim 1, characterized in that: The adjacent spoilers are staggered vertically and horizontally.

6. The oil removal pretreatment device as described in claim 1, characterized in that: An vent is provided at the bottom of the oil collection area.

7. The oil removal pretreatment device as described in claim 1, characterized in that: The oil scraping device includes an oil scraping motor, the shaft of which is connected to an oil scraping shaft via a coupling, and an oil scraping plate is connected to the oil scraping shaft.

8. The oil removal pretreatment device as described in claim 1, characterized in that: Both the first and second oil collection troughs are isosceles trapezoidal troughs, while both the slow-flow trough and the water level trough are rectangular troughs.

9. The oil removal pretreatment device as described in claim 1, characterized in that: The upper end of the oil removal tank is an open opening, and several movable covers are provided on the open opening.

10. The oil removal pretreatment device as described in claim 9, characterized in that: A handle is fixed to the movable cover plate, and an exhaust port is also provided on the movable cover plate above the air flotation separation zone.

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