CN204897574U - Oily waste water contact filtration combination formula advanced treatment unit that flocculates a little - Google Patents

Abstract

The utility model discloses a micro-flocculation contact filtration combined advanced treatment device for oily waste water with simple operation, low investment, reliable operation, reasonable and effective. It includes the outlet channel of the grease trap, the sump, the water inlet pump, and the filter. There is a first water inlet pipe on one side of the outlet channel of the grease trap, and a submersible pump is installed in the outlet channel of the grease trap. The water pipe is connected to one side of the water collection tank, and the other side of the water collection tank is connected to the water inlet pump through the second water inlet pipe; it also includes a backwash water pump, and the filter is also connected to the clear water tank and the air compressor respectively. The lower part of the device is provided with a third water outlet pipe, and the end of the third water outlet pipe leads into the clear water tank; one end of the backwash water pump is connected to the fourth water outlet pipe, the backwash water inlet pipe, and the second connecting pipe, and communicates with the bottom of the filter for backwashing. The other end of the water pump is connected with the clear water pool through the fourth water inlet pipe. The device is simple, low in operation investment cost, and convenient in operation and management.

Description

Micro-flocculation contact filtration combined advanced treatment device for oily wastewater

technical field

The utility model belongs to the field of wastewater treatment, in particular to a micro-flocculation contact filtration combined advanced treatment device for oily wastewater.

Background technique

Oily wastewater is a common industrial wastewater with a large volume and wide range. Petroleum mining, processing and transportation, electromechanical and mechanical processing, petrochemical and other industries discharge a large amount of oily wastewater every day, which seriously endangers the safety of the water environment. After the pool is treated, the oil content, COD, suspended matter and other indicators are still high, which cannot meet the requirements of reuse and are discharged, which not only pollutes the environment, but also causes a waste of water resources.

The particle size of slick oil and solid attached oil in oily wastewater is relatively large, so it is easy to separate from wastewater and can be basically removed after treatment in a grease trap (or sedimentation tank); dispersed oil and emulsified oil have high dispersion and stability, Commonly used techniques such as oil separation and air flotation are difficult to remove them, so advanced treatment is required; the content of dissolved oil is generally low, but it is not easy to be removed, and it must be converted into insoluble matter before treatment.

In the primary treatment of oily wastewater, floating oil is separated from water, and then the emulsified oil is changed and separated by secondary treatment technology or post-treatment technology. The treatment of emulsified oil is relatively complicated. After primary gravity separation, secondary treatment or post-treatment is required. Commonly used treatment methods include chemical demulsification, air flotation, electrolysis, biological treatment technology, membrane separation, and coarse graining. , filtration, adsorption.

At present, the treatment of oily wastewater generally adopts the "old three sets" of equipment and field ponds, that is, grease traps, then air flotation (sedimentation) ponds, and then to biochemical aeration ponds. The chemicals used are almost all polyaluminum chloride , because the floc structure formed by the hydrolysis of the agent is loose, the amount of scum is large and the density is small, the water content is high, and the sedimentation and dehydration are poor, which often brings great difficulties to the subsequent sludge treatment, and inevitably cause secondary pollution. Because oily wastewater often contains corrosion inhibitors, bactericides, etc., the effect of the biochemical unit treatment in this process is not good. Under the action of surfactant, the emulsified oil in oily wastewater is very stable, not easy to be destroyed, and difficult to handle. One of the traditional treatment methods is to add another surfactant with high surface activity but short molecular chain or branched chain to the wastewater containing emulsified oil to break the emulsion, but the addition of surfactant will cause new pollution. Another traditional method is to make the oil droplets move to the electrode and discharge under the action of a high-voltage electrostatic field, and then condense at the electrode to achieve separation, but this method is not suitable for large-scale applications.

Utility model content

The purpose of the utility model is to provide a micro-flocculation contact filtration combined advanced treatment device for oily wastewater with simple operation, low investment, reliable operation, reasonable and effective.

In order to solve the above problems, the technical solution of the utility model is as follows: a micro-flocculation contact filtration combined advanced treatment device for oily wastewater, including a grease trap outlet channel, a sump, an inlet pump, a filter, and a grease trap outlet channel on one side. There is a first water inlet pipe, and a submersible sewage pump is installed in the outlet channel of the grease trap. The submersible sewage pump is connected to one side of the sump through the first outlet pipe, and the other side of the sump is connected to the water inlet pump through the second water inlet pipe. It also includes a backwashing water pump, the filter is also connected to the clear water tank and the air compressor, the lower part of the filter is provided with a third water outlet pipe, and the end of the third water outlet pipe leads into the clear water pool; the backwash water pump (43) One end of the backwashing water pump is connected to the fourth water outlet pipe, the backwashing water inlet pipe, and the second connecting pipe, and communicates with the bottom of the filter. The other end of the backwashing water pump is connected to the clear water pool through the fourth water inlet pipe; Attaches to the bottom of the filter.

In view of the large amount of oily wastewater, difficult to degrade, and strong pollution, it is necessary to research and develop a new and efficient oily wastewater treatment method, which can be used as a unit operation after the grease trap or mixed sedimentation tank, so as to improve the level and effect of oily wastewater treatment , in order to achieve the purpose of in-depth treatment and reuse. This device is mainly aimed at the dispersed oil and emulsified oil in oily wastewater. Based on the good effect of micro-flocculation filtration and contact filtration on the advanced treatment of oily wastewater, the two are creatively combined. On the one hand, the scale of the dispersed phase of pollutants is moderately increased. , which is conducive to the pollutants being intercepted by the filter bed; on the other hand, it can effectively reduce the electrical properties of the filter material surface, which is conducive to the adsorption of pollutants by the filter material and the full use of the adsorption capacity of the filter material in the deep layer of the filter bed, giving full play to both their respective advantages. It can effectively demulsify flocculation and adsorption co-precipitation to remove emulsified oil and dispersed oil, and the flocculant has no toxic effect on water body.

The utility model adopts the homogeneous ceramsite sand filter material with low Zeta potential, which has long stable operation period, high water yield and large working adsorption capacity, and effectively improves the effect of advanced treatment of oily wastewater contact filtration.

The utility model adopts the advanced and reliable technology of air-water combined recoil-water recoil, and is supplemented with a long handle filter head, which can make the filter bed not stratified, flush evenly, not suitable for mud balls, and the loss rate of filter material is low. The washing water consumption rate is small, the air volume is saved, and the operation is simple, resulting in complete regeneration of the filter bed and restoring its adsorption capacity.

The water collecting tank of the utility model has no stirring and mixing device, and the micro-flocculation that occurs is anisotropic flocculation caused by Brownian motion, which saves power consumption, and the cost of the flocculant formula used is low, resulting in a water treatment cost of 0.58 in this process. Yuan/ton, far lower than the current price of industrial water.

In summary, the oily wastewater micro-flocculation contact filtration combined advanced treatment device of the utility model is simple, with low operating investment costs, convenient operation and management, effluent water quality meets the national first-class discharge standard, effluent residual oil concentration is below 12mg/L, and COD is removed The removal rate of turbidity is over 49%, and the removal rate of turbidity is over 93%, which significantly improves the level and effect of oily wastewater treatment, and achieves the purpose of advanced treatment and reuse.

Description of drawings

Fig. 1 is a schematic structural diagram of a micro-flocculation contact filtration combined advanced treatment device for oily wastewater.

The meanings of the reference signs are as follows: 1—the outlet channel of the grease trap; 2—the sump; 3—the filter; 4—the clear water pool; The first outlet pipe; 9—the first check valve; 10—the first valve; 11—the second valve; 12—the first vent pipe; 13—the third valve; 14—the second water inlet pipe; 15—the water inlet pump ; 16—the second outlet pipe; 17—the fifth valve; 18—the water inlet flowmeter; 19—the sixth valve; 20—the return pipe; 21—the dosing pipe; 22—the dosing flow meter; ; 24—dispensing box; 25—the third water inlet pipe; 26—the seventh valve; Eight valves; 32—third outlet pipe; 33—backwashing water inlet pipe; 34—tenth valve; 35—eleventh valve; 36—drainage pipe; 37—flush flow meter; 38—twelfth valve; Exhaust pipe; 40—ninth valve; 41—fourth water inlet pipe; 42—fourteenth valve; 43—backwash water pump; 44—fifteenth valve; 45—fourth outlet pipe; 46—flush flow meter; 47—overflow pipe; 48—second vent pipe; 49—thirteenth valve; 50—compressed air pipe; 51—air flow meter; 52—third pressure gauge; 53—second check valve; 54— Sixteenth valve.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

As shown in the figure, a micro-flocculation contact filtration combined advanced treatment device for oily wastewater includes a grease trap outlet channel 1, a sump 2, an inlet pump 15, and a filter 3, and a first oil trap outlet channel is installed on one side of the grease trap outlet channel 1. A water inlet pipe 6 and a submersible sewage pump 7 are arranged in the outlet channel 1 of the grease trap. The water pipe 14 is connected with the water inlet pump 15; it is characterized in that: it also includes a backwash water pump 43, and the filter 3 is also connected with the clear water tank 4 and the air compressor 5 respectively, and the outlet end connected to the water inlet pump 15 is connected with the second water outlet pipe 16, the second Three inlet pipes 25, the first connecting pipe 28, and communicate with the top of the filter 3; the bottom of the filter 3 is provided with a third outlet pipe 32, and the end of the third outlet pipe 32 leads into the clear water pool 4; one end of the backwash water pump 43 is connected The fourth water outlet pipe 45, the backwash water inlet pipe 33, the second connecting pipe 29, and communicate with the bottom of the filter 3, the other end of the backwash water pump 43 is connected with the clear water pool 4 through the fourth water inlet pipe 41; the air compressor 5 is connected to the bottom of filter 3 through compressed air pipe 50.

The first water outlet pipe 8 is provided with a first check valve 9 and a first valve 10 . A first venting pipe 12 is provided at the bottom of the sump 2 , and a second valve 11 is provided on the first venting pipe 12 .

The second water inlet pipe 14 is connected with the dispensing box 24 through the medicine feeding pipe 21 , the second water inlet pipe 14 is provided with a third valve 13 ; the medicine feeding pipe 21 is provided with a flow meter 22 and a fourth valve 23 .

The second outlet pipe 16 is provided with a fifth valve 17 and a water inlet flowmeter 18, the second outlet pipe 16 is connected with a return pipe 20, the other end of the return pipe 20 is connected with the sump 2, and the return pipe 20 is provided with a sixth valve. Valve 19. The third inlet pipe 25 is provided with a seventh valve 26; the first connecting pipe 28 is provided with a first pressure gauge 27; the second connecting pipe 29 is provided with a second pressure gauge 30; the third outlet pipe 32 is provided with a first pressure gauge 27; Eight valves31.

The filter 3 is provided with a filter material layer, a cushion material layer and a long-handle filter head from top to bottom; the flocculant in the dispensing box 24 is polyethyleneimine PEI compound flocculant. The filter material layer of the filter is composed of homogeneous ceramsite sand with a particle size of 0.9~1.3mm and a thickness of 1200mm; the cushion layer is composed of quartz sand with a particle size of 4~8mm and a thickness of 200mm; the number of long handle filter heads can be 6 pieces, the air-water backwashing of the filter can be realized through the long handle filter head.

The top of the filter 3 is provided with an exhaust pipe 39, and the bottom of the filter 3 is provided with a drain pipe 36 and a second vent pipe 37; the exhaust pipe 39 is provided with a ninth valve 40, and the backwash water inlet pipe 33 is provided with The tenth valve 34 ; the eleventh valve 35 is arranged on the drain pipe 36 , and the twelfth valve 38 is arranged on the vent pipe 37 .

The clean water pool 4 is provided with an overflow pipe 47 and a second vent pipe 48, and the second vent pipe 48 is provided with a thirteenth valve 49. The fourth water inlet pipe 41 is provided with a fourteenth valve 42 ; the fourth water outlet pipe 45 is provided with a fifteenth valve 44 and a flushing flow meter 46 . The compressed air pipe 50 is provided with an air flow meter 51 , a third pressure gauge 52 , a second check valve 53 and a sixteenth valve 54 .

The inlet water treatment process of the utility model is as follows: the incoming water of the grease trap flows into the outlet channel 1 of the grease trap through the first water inlet pipe 6, and the outlet water is lifted to the sump 2 by the submersible sewage pump 7. The oily wastewater in the sump 2 passes through the water inlet pump 15 and part of the water backflows (the reflux ratio is 3:1), and the tubular PEI compound flocculant is added to the second water inlet pipe 14, and the emulsified oil and dispersed oil in the wastewater are broken. Milk flocculation and adsorption bridging form tiny flocs, forming oily wastewater and micro-flocculation mixed water, which is pumped by the inlet pump 15 to the filter 3 through the second outlet pipe 16, the third inlet pipe 25, and the first connecting pipe 28 in sequence. Open the seventh valve 26 and the eighth valve 31, close the tenth valve 34 and the eleventh valve 35, the mixed water in the filter 3 flows through the filter material from top to bottom, micro-flocculation and contact filtration occur, and passes through the homogeneous ceramic Interception, surface adsorption, inertial collision, sieving, etc. of the granular sand filter material, the micro flocs, COD, and turbidity substances of the emulsified oil and dispersed oil in the mixed water are removed, and the water outlet of the filter 3 passes through the second connecting pipe 29, the second Three outlet pipes 32 enter the clear water pool 4. The water quality of the clean water pool 4 meets the national first-class discharge standard, and the oily wastewater reaches the purpose of advanced treatment and reuse.

When the outlet water of filter 3 exceeds the standard, the filter bed needs to be regenerated by air-water combined backwash-water backwash. The specific occurrence method is: open the tenth valve 34 and the eleventh valve 35, close the seventh valve Valve 31, clean water pool 4 store water through backwashing water pump 14 successively through the 4th water outlet pipe 45, backwashing water inlet pipe 32, the second connecting pipe 29 to form a water layer at the bottom of filter 3; Turn on air compressor 5, compressed air passes through The compressed air pipeline 50 forms an air layer at the bottom of the filter 3; the air layer formed at the bottom of the filter 3 flushes the filter bed from bottom to top for 5 minutes at the same time, closes the air compressor 5 and the sixteenth valve 54, and the separate water layer flushes the filter bed. After 5 minutes, the regeneration of the filter bed is completed and its adsorption capacity is restored.

Claims (10)

1. A microflocculation contact filtration combined advanced treatment device for oily wastewater, comprising a grease trap outlet channel, a sump, an inlet pump, a filter, a first water inlet pipe is provided on one side of the grease trap outlet channel, and a grease trap outlet There is a submersible sewage pump in the canal, the submersible sewage pump is connected to one side of the sump through the first water outlet pipe, and the other side of the sump is connected to the water inlet pump through the second water inlet pipe; it is characterized in that it also includes backwashing The water pump (43), the filter (3) are also respectively connected to the clear water tank (4) and the air compressor (5), and the outlet port connected to the water inlet pump (15) is connected to the second water outlet pipe (16), the third water inlet pipe (25), the first connecting pipe (28), and communicated with the top of the filter (3); the lower part of the filter (3) is provided with a third water outlet pipe (32), and the end of the third water outlet pipe (32) leads into Clear water pool (4); one end of the backwash water pump (43) is connected to the fourth water outlet pipe (45), the backwash water inlet pipe (33), the second connecting pipe (29), and communicates with the bottom of the filter (3), The other end of the backwash water pump (43) is connected to the clean water tank (4) through the fourth water inlet pipe (41); the air compressor (5) is connected to the bottom of the filter (3) through the compressed air pipe (50). 2. The microflocculation contact filtration combined advanced treatment device for oily wastewater according to claim 1, characterized in that: the first outlet pipe (8) is provided with a first check valve (9) and a first valve ( 10). 3. The micro-flocculation contact filtration combined advanced treatment device for oily wastewater according to claim 1 or 2, characterized in that: the bottom of the sump (2) is provided with a first vent pipe (12), and the first The vent pipe (12) is provided with a second valve (11). 4. The microflocculation contact filtration combined advanced treatment device for oily wastewater according to claim 3, characterized in that: the second water inlet pipe (14) is connected to the dispensing box (24) through the dosing pipe (21), and the second The second water inlet pipe (14) is provided with a third valve (13); the drug feeding pipe (21) is provided with a flow meter (22) and a fourth valve (23). 5. The micro-flocculation contact filtration combined advanced treatment device for oily wastewater according to claim 4, characterized in that: the second outlet pipe (16) is provided with a fifth valve (17) and an inflow flow meter (18 ), the second outlet pipe (16) is connected with a return pipe (20), the other end of the return pipe (20) is connected with the sump (2), and the return pipe (20) is provided with a sixth valve (19). 6. The microflocculation contact filtration combined advanced treatment device for oily wastewater according to claim 5, characterized in that: the third water inlet pipe (25) is provided with a seventh valve (26); the first connecting pipe (28) is provided with a first pressure gauge (27); the second connecting pipe (29) is provided with a second pressure gauge (30); the third outlet pipe (32) is provided with an eighth valve ( 31). 7. The micro-flocculation contact filtration combined advanced treatment device for oily wastewater according to claim 6, characterized in that: the filter (3) is provided with a filter material layer, a pad layer and a long handle filter from top to bottom. head; the top of the filter (3) is provided with an exhaust pipe (39), and the bottom of the filter (3) is provided with a drain pipe (36) and a second vent pipe (37); the exhaust pipe (39) is provided with There is a ninth valve (40), a tenth valve (34) is arranged on the backwash water inlet pipe (33); an eleventh valve (35) is arranged on the drain pipe (36), and an Twelfth valve (38). 8. The microflocculation contact filtration combined advanced treatment device for oily wastewater according to claim 7, characterized in that: the clear water pool (4) is provided with an overflow pipe (47) and a second vent pipe (48), A thirteenth valve (49) is provided on the second vent pipe (48). 9. The microflocculation contact filtration combined advanced treatment device for oily wastewater according to claim 8, characterized in that: the fourth inlet pipe (41) is provided with a fourteenth valve (42); The water pipe (45) is provided with a fifteenth valve (44) and a flushing flow meter (46). 10. The microflocculation contact filtration combined advanced treatment device for oily wastewater according to claim 9, characterized in that: the compressed air pipe (50) is provided with an air flow meter (51), a third pressure gauge (52) , the second check valve (53), the sixteenth valve (54).