CN108840500A - A kind of waste emulsified mixture processing method and processing device - Google Patents

Abstract

The invention belongs to the technical field of waste emulsion treatment, and specifically relates to a waste emulsion treatment method. First, under negative pressure, the waste emulsion is heated by water vapor in a circulating flow environment, and then oil and fats containing low boiling point Water vapor separation of lipids; further, condensing water vapor to obtain condensate; then, the condensate is filtered through an inorganic nano-hydrophilic membrane to obtain clean water with a COD content lower than 100mg/L; the present invention also provides waste The emulsion treatment device includes an evaporation heating chamber. The evaporation heating chamber is provided with a waste liquid inlet, a first hot liquid outlet and a second hot liquid outlet; the separation chamber is provided with a hot liquid inlet, a hot oil outlet and a steam outlet. The first The hot liquid outlet is connected to the hot liquid inlet, and the second hot liquid outlet and the hot oil outlet are connected to the waste liquid inlet through an efficient circulation pump; the condensation tower and the inorganic nano-hydrophilic membrane filter; it has the advantages of small footprint, high degree of purification, Low cost, no secondary pollution and other advantages.

Description

Method and device for treating waste emulsion

technical field

The invention belongs to the technical field of emulsion treatment, and in particular relates to a waste emulsion treatment method and device.

Background technique

In the machining and metal cutting industries, it is often necessary to use emulsion to lubricate and cool tool parts. With the recycling of the emulsion, part of the emulsion will be discharged from the system periodically or continuously, and the discharged emulsion will not be able to continue to be used, and it will become a waste emulsion, and direct discharge will cause serious pollution to the environment.

The oil content of the waste emulsion is mostly 2-10% or more, which is a high-concentration waste emulsion. At present, the treatment of high-concentration waste emulsion adopts the treatment process of low-concentration waste emulsion, and the oil content of low-concentration waste emulsion is mostly less than 1%. The process is the process of chemical demulsification + air flotation + biochemical mechanical filtration treatment .

The process of chemical demulsification + air flotation + biochemical mechanical filtration treatment is a traditional process commonly used at present, and there are many problems. Firstly, chemicals need to be added to the waste emulsion to break the emulsified state of the emulsified oil in the emulsion, so that the oil and water can be separated; then the demulsified oil is separated to the liquid surface by means of air flotation. The separated water is discharged to the municipal pipe network after biochemical treatment and mechanical filtration. In the first step of the process, adding medicine to demulsify will produce a large amount of sludge. The sludge mentioned here is the floc produced by mixing emulsifier and oil. In the current situation that the sludge disposal cost is getting higher and higher, the increase Disposal costs and cause secondary pollution. In the second step, the emulsion after demulsification is air flotation to separate the floating oil to the liquid surface. If the oil is not completely removed, part of the emulsified oil will continue to exist in the liquid. The third step of biochemical treatment is because the influent water contains some oil and the biodegradability of the raw water is not high. Mechanical filtration can only intercept suspended solids in the water.

It can be seen from Table 2 that the treatment effect of this process is poor and unstable; in some cases, the effluent needs to be mixed with other industrial wastewater with low COD content and discharged into the municipal pipe network. For industrial wastewater without low COD content, tap water can only be added. It is a great waste of resources and is not advisable.

The country has always advocated energy saving, emission reduction, and environmental protection. Therefore, it is an urgent problem to develop a new emulsion treatment process to completely solve the disadvantages of the traditional process for treating high-concentration waste emulsion.

Contents of the invention

In order to solve the above problems in the prior art, the present invention provides a waste emulsion treatment method and device, which has the characteristics of high water purification capacity, low cost, no secondary pollution, small footprint, and high degree of automation.

The technical problem to be solved in the present invention is realized through the following technical solutions:

Waste emulsion treatment method of the present invention, comprises the following steps:

(1) Waste emulsion heating: the waste emulsion is heated in a circulating environment to obtain a hot emulsion;

(2) oil-water separation: the water vapor and grease in the hot emulsion are collected respectively, and the water vapor contains lipids with low boiling points;

(3) condensed water collection: condensing the water vapor to obtain condensed water;

(4) Purification of condensed water: filter the condensed water through an inorganic nano-hydrophilic membrane to obtain clean water with a COD content lower than 100 mg/L;

Step (1), step (2) and step (3) are all carried out under negative pressure conditions;

The inorganic nano-hydrophilic membrane is prepared from one or more inorganic nanoparticles in SiO ₂ , TiO ₂ , ZnO, CdS, ZnS and Al ₂ O ₃ , and the inorganic nano-hydrophilic membrane is beneficial to water molecules and soluble substances The pore diameter of the inorganic nano-hydrophilic membrane is less than 100nm.

Further, the grease obtained in step (2) continues to return to the environment of step (1) for heating;

Further, the negative pressure condition is: the vacuum pressure is -0.088MPa--0.053MPa, and the heating temperature is: 50°C-80°C.

Further, in step (1), the heating method is steam heating.

Further, in step (4), the condensed water is filtered through the inorganic nano-hydrophilic membrane in a circulating flow environment.

The present invention also provides a waste emulsion treatment device, the provided device:

It includes an evaporation heating chamber, and the evaporation heating chamber is provided with a waste liquid inlet, a first hot liquid outlet and a second hot liquid outlet;

The separation chamber is provided with a hot liquid inlet, a hot oil outlet and a steam outlet. The first hot liquid outlet is connected to the hot liquid inlet, and the second hot liquid outlet and the hot oil outlet are connected to the waste liquid inlet through an efficient circulation pump;

A condensation tower, the condensation tower is provided with a steam inlet and a condensate outlet; the steam outlet is connected to the steam inlet;

Inorganic nanometer hydrophilic membrane filter, the inorganic nanometer hydrophilic membrane filter is provided with a condensate inlet, and the condensate outlet is connected with the condensate inlet.

Further, a vacuum pump is also included, and the evaporation heating chamber, the separation chamber and the condensation tower are all connected with the vacuum pump.

Further, the heights of the first hot liquid outlet and the second hot liquid outlet are both lower than the height of the waste liquid inlet.

Further, the height of the steam outlet is higher than that of the hot liquid inlet and the hot oil outlet.

Further, the inorganic nano-hydrophilic membrane filter is provided with an inorganic nano-hydrophilic membrane, and the inorganic nano-hydrophilic membrane is used to filter the condensate.

Compared with the prior art, the inventive method and the inventive device have the following beneficial effects:

1. Because in the inventive method, condensate is filtered by inorganic nano-hydrophilic membrane, and after inorganic nano-hydrophilic membrane is filtered, can obtain the clean water that COD content is lower than 100mg/L, and degree of purification is better than traditional process; Simultaneously, It belongs to physical filtration. Compared with the traditional process, there are fewer process steps, no need to add emulsifier, and no secondary pollution.

2. Because in the method of the present invention, the waste emulsion is heated under the environment of circulating flow, the waste emulsion can be heated in sufficient amount, and then oil and water are separated, time and cost are saved, and the degree of automation is improved.

3. Because in the method of the present invention, the grease obtained in step (2) continues to return to step (1) for cyclic heating, so that more water vapor can be evaporated, so that the oil-water separation is more thorough, and then more condensate is formed.

4. Since in the method of the present invention, the waste emulsion is heated under a negative pressure state, at a lower temperature, moisture will become water vapor; further, more grease in the waste emulsion can be separated, It is not taken away by water vapor, so that the water vapor is cleaner and easier to purify the subsequent condensate.

5. Because in the method of the present invention, the condensate is also filtered through the inorganic nano-hydrophilic membrane in the environment of circulating flow, which not only improves the filtration efficiency, but also improves the purification effect.

6. Since the device of the present invention is provided with an inorganic nano-hydrophilic membrane filter, after the condensate enters the inorganic nano-hydrophilic membrane filter, through the filtration of the inorganic nano-hydrophilic membrane, the non-hydrophilic properties such as fats and oils of larger particles The substances are intercepted, and the hydrophilic water and dissolved substances pass through the inorganic nano-hydrophilic membrane, so that the materials can be separated and the condensate can be purified.

7. Since the vacuum pump in the device of the present invention, the evaporation heating chamber, the separation chamber and the condensation tower are all connected to the vacuum pump, the waste emulsion can change water into water vapor at a lower temperature, and more importantly, the water vapor can only carry A small amount of oil with larger particles provides a guarantee for subsequent filtration.

8. In the device of the present invention, both the second hot liquid outlet and the hot oil outlet are connected to the waste liquid inlet through an efficient circulation pump, so that the dirty oil deposited at the bottom of the separation chamber can enter the evaporation heating chamber for multiple cycles to be heated for oil-water separation deal with.

9. Since the device of the present invention includes a waste oil storage tank, the waste oil storage tank is connected to the hot oil outlet and the second hot liquid outlet respectively, so that the remaining grease after final treatment is recovered in the waste oil tank and can be recycled rational use.

Description of drawings

Fig. 1 is a schematic diagram of the waste emulsion treatment device of the present invention.

Fig. 2 is a cost comparison chart of the process of the present invention and the traditional process for treating waste emulsion.

Fig. 3 is a columnar comparison chart of costs required for using the device of the present invention and entrusting the outside to process the waste emulsion separately within five years.

In the figure: 1. Stock solution tank; 11. Feed pump; 2. Evaporation heating chamber; 21. Waste liquid inlet; 22. Steam valve; 23. Second hot liquid outlet; 24. First hot liquid outlet; 3. Separation 31. Steam outlet; 32. Hot liquid inlet; 33. Hot oil outlet; 34. Efficient circulation pump; 4. Condensation tower; 41. Condensate tank; 42. Steam inlet; 43. Condensate outlet; Liquid pump; 45. Vacuum pump; 5. Inorganic nanometer hydrophilic membrane filter; 51. Circulation pump; 52. Filter outlet; 53. Condensate inlet; 54. Water purification outlet; 6. Inorganic nanometer hydrophilic membrane circulation tank; 61. Liquid supply pump; 7. Waste oil storage tank; 8. Qualified water tank; 81. Reuse water pump.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention is described below through specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are illustrative only and do not limit the scope of the present invention.

Features of high concentration waste emulsion:

1. The oil content is relatively high, generally 5%-8%, that is, the oil content is 50000-80000mg/L;

2. Good microemulsion state and high stability. The stability of the emulsion is one of the important indicators of quality requirements. Due to the effect of surfactants, the oil particle size is generally 5 μm to 0.05 μm. Demulsification.

3. The particle size of metal ions and solid particles is small and the content is high. The fine metal particles of metal dust produced during the recycling process, including copper and zinc, are attached to the emulsion and are also in a relatively stable dispersed state.

Under the requirements of the third-level comprehensive sewage discharge standard currently implemented by the state, the effluent water quality of traditional processes can meet the requirements except for COD. The effluent water needs to be mixed with other low-COD water from the enterprise to meet the requirements. The improvement of environmental protection requirements will make the discharge standards more and more stringent. At present, some areas have begun to implement high-demand standards similar to the first-level standard of comprehensive sewage discharge standards. Under this trend, the traditional process can no longer meet the requirements. The water quality can fully meet the requirements or even exceed the high standard requirements.

In order to make the treatment effect of waste emulsion more thorough, the following treatment methods are proposed.

Waste emulsion treatment method of the present invention, comprises the following steps:

(1) Waste emulsion heating: the waste emulsion is heated in a circulating environment to obtain a hot emulsion; the heating method is steam heating, and the heating temperature is: 50°C to 80°C;

(2) oil-water separation: the water vapor and the grease in the hot emulsion are collected respectively, and the water vapor contains lipids with low boiling points; the grease obtained in step (2) continues to return to the environment of step (1) heating in

(3) condensed water collection: condensing the water vapor to obtain condensed water;

(4) Purification of condensed water: filter the condensed water through the inorganic nano-hydrophilic membrane to obtain clean water with a COD content lower than 100 mg/L; the condensed water is filtered through the inorganic nano-hydrophilic membrane in a circulating environment .

Step (1), step (2) and step (3) are all carried out under negative pressure conditions; said negative pressure conditions are: vacuum pressure is -0.088MPa～-0.053MPa;

Wherein, the inorganic nano-hydrophilic film is prepared from one or more inorganic nanoparticles in SiO2, TiO2, ZnO, CdS, ZnS and Al2O3, and the inorganic nano-hydrophilic film is conducive to the penetration of water molecules and soluble substances. Moreover, the pore diameter of the inorganic nanometer hydrophilic membrane is less than 100nm.

In this method, since the condensate is filtered through the inorganic nano-hydrophilic membrane, and the purified water with COD content lower than 100mg/L can be obtained after the inorganic nano-hydrophilic membrane is filtered, the purification degree is better than that of the traditional process; at the same time, it belongs to physical filtration, Compared with the traditional process, the process steps are less; in addition, there is no need to add emulsifiers, and there is no secondary pollution.

In the method, since the waste emulsion is heated in a circulating flow environment, a sufficient amount of the waste emulsion can be heated to further separate oil and water, thereby saving time and cost, and improving the degree of automation.

In the method, steam heating is adopted, and the heat efficiency and heat utilization rate are high, and there will be no poor heat transfer effect due to fouling of the heating pipe.

In this method, since the grease obtained in the step (2) continues to return to the step (1) for circulation and heating, more water vapor can be evaporated, the oil and water can be separated more thoroughly, and more condensate can be formed.

In this method, since the waste emulsion is heated under negative pressure, the moisture will turn into water vapor at a lower temperature; Take it away, so that the water vapor is cleaner and easier to purify the subsequent condensate. Since the condensate is also filtered through the inorganic nano-hydrophilic membrane in a circulating environment, it not only improves the filtration efficiency, but also improves the purification effect.

The present invention also provides a waste emulsion treatment device, specifically as follows:

Referring to Fig. 1, the waste emulsion treatment device includes, the evaporation heating chamber 2 is provided with a waste liquid inlet 21, a first hot liquid outlet 24 and a second hot liquid outlet 23; the waste liquid inlet 21 is located at the top of the evaporation heating chamber 2 , the second hot liquid outlet 23 is located at the bottom of the evaporation heating chamber 2, and the first hot liquid outlet 24 is located at the lower part of the evaporation heating chamber 2; the outer wall of the evaporation heating chamber 2 is provided with a steam layer, and the steam layer communicates with the external hot steam through pipes , the pipeline is provided with a steam valve 22, and the steam valve 22 is used to control the steam flow.

The separation chamber 3 is provided with a hot liquid inlet 32, a hot oil outlet 33 and a steam outlet 31, the first hot liquid outlet 24 is connected to the hot liquid inlet 32, and the second hot liquid outlet 23 and the hot oil outlet 33 pass through The efficient circulation pump 34 is connected to the waste liquid inlet 21; the hot liquid inlet 32 is located at the lower part of the separation chamber 3, the hot oil outlet 33 is located at the bottom of the separation chamber 3, and the steam outlet 31 is located at the top of the separation chamber 3.

Condensation tower 4 is provided with steam inlet 42 on the condensation tower 4; Steam outlet 31 links to each other with steam inlet 42; The bottom of the tank 41 is provided with a condensate outlet 43 .

Inorganic nanometer hydrophilic membrane filter 5 , the bottom of the inorganic nanometer hydrophilic membrane filter 5 is provided with a condensate inlet 53 , and the condensate outlet 43 is connected to the condensate inlet 53 through a condensate pump 44 . The condensate in the condensate tank 41 is sent to the inorganic nano-hydrophilic membrane filter 55 by the condensate pump 44 for filtration.

Further, in order to better control the flow of condensate into the inorganic nano-hydrophilic membrane filter 5, an inorganic nano-hydrophilic membrane circulation tank 6 is arranged between the condensate tank 41 and the inorganic nano-hydrophilic membrane filter 5 The specific connection relationship is that the condensate outlet 43 is connected to the inlet at the top of the inorganic nano-hydrophilic film circulation tank 6 through the condensate pump 44, and the outlet at the bottom of the inorganic nano-hydrophilic film circulation tank 6 is connected to the condensate inlet through the liquid supply pump 61 53 connected; the liquid supply pump 61 further transports the condensate in the inorganic nano-hydrophilic membrane circulation tank 6 to the inorganic nano-hydrophilic membrane filter 5 for filtration.

In order to enable the waste emulsion to separate the moisture in the waste emulsion from the grease in the form of water vapor at a lower temperature, and perform the first purification treatment, the device is also equipped with a vacuum pump 45; the evaporation heating chamber 2 and the separation Chamber 3 and condensing tower 4 are all connected with vacuum pump 45; like this, after vacuumizing, under negative pressure state, just can make waste emulsion in lower temperature, the moisture in waste emulsion is separated with grease in the form of steam. Separation can also ensure that some less oil is taken away by water vapor, reducing the workload of subsequent purification of oil in condensed water and reducing costs.

The device also includes a waste oil storage tank 7, the first hot liquid outlet 24 and the second hot liquid outlet 23 are all connected to the waste oil storage tank 7 through an efficient circulation pump 34; the waste emulsion in the evaporation heating chamber 2 is heated and evaporated to During the final stage, the oily substances left in the evaporation heating chamber 2 and the separation chamber 3 are pumped into the waste oil storage tank 7 by the effective circulation pump 34, and then reasonably utilized; for example, after being treated, it can be Used for diesel, engine oil and other functions.

The inorganic nanometer hydrophilic membrane filter 5 is provided with an inorganic nanometer hydrophilic membrane, and the inorganic nanometer hydrophilic membrane is used to filter the condensate. The inorganic nano-hydrophilic membrane is prepared from one or more inorganic nano-particles of SiO ₂ , TiO ₂ , ZnO, CdS, ZnS and Al ₂ O ₃ . Since the inorganic nano-hydrophilic membrane is hydrophilic, and the oil with a larger particle size in the condensate is a non-hydrophilic substance, only hydrophilic water and soluble substances will pass through the inorganic nano-hydrophilic membrane, Grease substances with larger particle sizes are isolated by the inorganic nano-hydrophilic membrane, and then the condensate is purified for the second time; moreover, the inorganic nano-hydrophilic membrane can be made by using the existing membrane-making process.

In order to make the water quality better after the condensate is processed by the inorganic nanometer hydrophilic membrane filter 5, the top of the inorganic nanometer hydrophilic membrane filter 5 is also provided with a filter outlet 52, and the bottom of the inorganic nanometer hydrophilic membrane is provided with a water purification outlet 54, the filtered clear water flows out and reclaims through the clean water outlet 54; the filter outlet 52 is connected to the condensate inlet 53 through the circulation pump 51, and under the action of the circulation pump 51, the condensate in the inorganic nano-hydrophilic membrane filter 5 is in the In the flowing state, under the circulating flow of the condensate, it is filtered through the inorganic nano-hydrophilic membrane for many times, and the filtration is more thorough. Condensed water flows in from the bottom of the inorganic nano-hydrophilic membrane filter and flows out from the top, so that the flow can keep the condensed water in a balanced circulation state and slow down the pollution and damage of the inorganic nano-hydrophilic membrane.

In order to facilitate understanding here, a simple explanation is required. In this device, the inorganic nano-hydrophilic membrane in the inorganic nano-hydrophilic membrane filter is vertically arranged to facilitate the condensed water to be filtered through the inorganic nano-hydrophilic membrane filter for many times. For a more thorough look, see Figure 1. Certainly, in order to filter the condensed water in advance, to alleviate the burden of the inorganic nano-hydrophilic membrane filter, some inorganic nano-hydrophilic membranes can also be arranged horizontally in the inorganic nano-hydrophilic membrane circulation tank 6, so as to filter the condensed water in advance. filter. The inorganic nano-hydrophilic membrane can be made into a column structure, and the interior of the column structure is hollow, and a flow channel is formed along the axis of the column, allowing condensed water to pass through and filter; the inorganic nano-hydrophilic membrane can also be made into a cross-sectional It is a honeycomb columnar structure or other shapes, and a plurality of flow channels are formed inside for condensed water to pass through and filter. For this device, a cylindrical structure with a honeycomb cross section is used. When the condensed water passes through the inorganic nano-hydrophilic membrane filter, it passes through multiple flow channels in the inorganic nano-hydrophilic membrane, and passes through its multiple channels. Filtration can achieve better filtering effect.

The device is also equipped with a stock solution tank 1, which is used to hold high-concentration waste emulsion; it should be noted that the high-concentration waste emulsion has been subjected to primary filtration of metal slag; the stock solution tank 1 passes through the feed The pump is connected to the waste liquid inlet 21 . It is used to pump the waste emulsion into the evaporation heating chamber 2 for subsequent treatment.

Also, the waste oil filtered out in the inorganic nanometer hydrophilic membrane filter 5 can be pumped into the waste oil storage tank 7 at last.

Concrete work process of the present invention is as follows:

Turn on the vacuum pump 45, so that the evaporation heating chamber 2, the separation chamber 3 and the condensation tower 4 are all in a negative pressure state; add high-concentration waste emulsion in the stock solution tank 1, and under the action of the feed pump 11, the waste emulsion enters Evaporation heating chamber 2, at this time, open the steam valve 22, through the action of hot steam, the evaporation heating chamber 2 heats the waste emulsion; the heated waste emulsion enters the separation chamber 3 for oil-water separation; it is divided into water vapor and oil Water vapor then enters the condensation tower 4 to condense, and after condensation, the condensed liquid is stored in the condensate tank 41; the grease enters the evaporation heating chamber 2 under the effect of the efficient circulation pump 34 to continue heating; meanwhile, the waste emulsification at the bottom of the evaporation heating chamber 2 The liquid also enters the evaporation heating chamber 2 again from the top of the evaporation heating chamber 2 to be heated under the action of the effective circulation pump 34, so that the waste emulsion is always in the dynamic heating process, and the purpose of fully heating and fully processing is achieved; on the other hand, The condensate in the condensate tank 41 enters the inorganic nano-hydrophilic membrane circulation tank 6 under the action of the condensate pump 44, and the condensate in the inorganic nano-hydrophilic membrane circulation tank 6 enters the inorganic nano-hydrophilic membrane circulation tank 6 through the liquid supply pump 61 again. Water membrane filter 5, through the filtration of inorganic nanometer hydrophilic membrane filter 5, obtains clean water, then clean water is discharged in the qualified water tank; Simultaneously, make the inside of inorganic nanometer hydrophilic membrane filter 5 The condensate is extracted from the filter outlet 52, and then re-enters the inorganic nano-hydrophilic membrane filter 5 through the condensate inlet 53 to filter again. This effect is to make the condensate in a flowing state, and the filtering effect is better.

In addition, finally, the grease at the bottom of the evaporation heating chamber 2 and the bottom of the separation chamber 3 is pumped into the waste oil storage tank 7 through the efficient circulation pump 34 for recycling.

The concrete waste emulsion treatment process of the present invention is as follows:

The waste emulsion in the raw liquid tank 1 is transported to the evaporation heating chamber 2 by the feed pump 11, and it is heated by steam; at the same time, the evaporation heating chamber 2, the separation chamber 3 and the condensation tower 4 are all in a negative pressure state, and the negative pressure The compression pressure is between -0.088MPa～-0.053MPa; this can ensure that the water in the waste emulsion turns into water vapor at a relatively low temperature; and the heating temperature of the evaporation heating chamber 2 is between 50°C and 80°C.

The waste emulsion is heated in the evaporation heating chamber 2, and a part of the heated waste emulsion enters the separation chamber 3 for oil-water separation, and the water vapor enters the condensation tower 4 through the separation chamber 3, and is condensed into condensed water in the condensation tower 4; and at the same time The separated grease will stay at the bottom of the separation chamber 3, and will be continuously transported to the evaporation heating chamber 2 by the efficient circulation pump 34 to continue heating; meanwhile, another part of the heated waste emulsion will remain at the bottom of the evaporation heating chamber 2, and will be passed through the evaporation heating chamber 2. The effect of efficient circulation pump 34 is transported to continue heating in the evaporation heating chamber 2.

It should be noted that since part of the low-boiling-point esters is taken away by water vapor after being heated in the evaporation heating chamber 2 , the condensate contains low-boiling-point esters.

The condensate entering the condensation tower 4 is delivered to the inorganic nano-hydrophilic film circulation tank 6, and the inorganic nano-hydrophilic film circulation tank 6 is used to control the flow of the condensate;

The condensate in the inorganic nano-hydrophilic membrane circulation tank 6 enters the inorganic nano-hydrophilic membrane filter 5, and the low-boiling-point esters in the condensate are filtered out through the filtration of the inorganic nano-hydrophilic membrane, thereby purifying the condensed water. Among them, the inorganic nano-hydrophilic membrane is prepared from one or more inorganic nanoparticles in SiO ₂ , TiO ₂ , ZnO, CdS, ZnS and Al ₂ O ₃ , and the pore size of the inorganic nano-hydrophilic membrane is less than 100nm; The hydrophilic membrane is conducive to the passage of water molecules and dissolved substances, and hinders the non-hydrophilic esters and larger particles of esters, so that the condensed water can be purified.

In order to enable the condensed water to be fully filtered, the condensed water is in a state of circulating flow in the inorganic nano-hydrophilic membrane filter 5; it is specifically: the condensed water output from the inorganic nano-hydrophilic membrane circulation tank 6 constantly flows from the condensed liquid inlet 53 enters the inorganic nanometer hydrophilic membrane filter 5 to filter, and the condensed water flowing out from the filter outlet is continuously transported to the condensate inlet 53, and enters the inorganic nanometer hydrophilic membrane filter 5 to filter, so that the reciprocating cycle, Until the final purification is complete.

After completion of the process, the grease separated at the bottom of the evaporation heating chamber 2 and the bottom of the separation chamber 3 is delivered to the waste oil storage tank 7 by the efficient circulation pump 34, and at the same time, for the filtered out in the inorganic nanometer hydrophilic membrane filter 5 The grease is delivered to the waste oil storage tank 7, and the recovered grease in the waste oil storage tank 7 can be reprocessed as diesel oil or engine oil, which is environmentally friendly and energy-saving.

The inorganic nano-hydrophilic membrane filter is installed with an inorganic nano-hydrophilic membrane, and the inorganic nano-hydrophilic membrane is easy to clean and has a high reuse rate. Strong chemical compatibility; the inorganic nano-hydrophilic membrane is made of nano-materials, which has strong mechanical shock resistance.

According to the waste emulsion treatment method of the present invention, the waste emulsion is treated, and the effluent index reaches COD<100mg/L, BOD<20mg/L, petroleum <1.0mg/L, SS<1.0mg/L, and pH is 6-9 between. The water quality is more than 5 times higher than that of the traditional process, and the water quality is stable and can be directly discharged or reused in production. At the same time, the remaining waste oil can also be used as resources, no secondary waste is generated, and the operating cost is low. Can save a lot of cost for the market.

See Table 1 for details:

Table 1 traditional process treatment and process treatment effect contrast of the present invention

Table 2 process of the present invention and traditional process are comprehensively contrasted to waste emulsion treatment

As can be known from Table 2, the overall performance of the process of the present invention is far superior to the existing process.

Economic Benefit Analysis:

Status quo of waste emulsion: The storage of waste emulsion occupies a large area and is relatively dangerous. If an external company is entrusted to dispose of the waste emulsion, the cost will be high.

Take a certain company as an example, which produces 20T/day of waste emulsion and entrusts an external company to handle it at a cost of 3,000 yuan/ton. Referring to Fig. 2, it can be seen that the cost of entrusting an external enterprise to process the waste emulsion through the existing process is much higher than the process of the present invention.

In addition, taking an enterprise in Shaanxi as an example, the waste emulsion is produced 2.5T/day, and the commissioned external treatment fee is 3,000 yuan per ton, calculated on the basis of 5 years. And a columnar comparison chart as shown in Figure 3 is given. This columnar comparison chart is a cost comparison chart for five consecutive years. It can be seen from Figure 3:

The first year: it takes 1.586 million yuan to purchase the process equipment of the present invention. After the process of the present invention is processed, 136,000 yuan needs to be paid to the outside for the treatment of waste such as residual grease; The payment cost is 2.73 million yuan; it can be seen that in the first year, the cost required for the processing of the process equipment of the present invention is significantly lower than the cost of entrusting external processing.

The second year: the process and equipment of the present invention only need to pay 136,000 yuan for oil treatment; compared with the cost of entrusting external treatment of waste emulsion, it needs to pay 2.73 million yuan.

The third year: the process and equipment of the present invention only need to pay 136,000 yuan for oil treatment; compared with the cost of entrusting external treatment of waste emulsion, it needs to pay 2.73 million yuan.

The fourth year: the process and equipment of the present invention only need to pay 136,000 yuan for oil treatment; compared with the cost of entrusting external treatment of waste emulsion, it needs to pay 2.73 million yuan.

The fifth year: the process and equipment of the present invention only need to pay 136,000 yuan for oil treatment; compared with the cost of entrusting external treatment of waste emulsion, it needs to pay 2.73 million yuan.

In summary, it can be seen from the perspective of economic benefits that the process and equipment of the present invention can save a large part of the cost through the comparison of the required payment for five consecutive years.

Technology of the present invention adopts pure physical separation method, compared with traditional technology, main advantage is as follows:

1. Fully automatic integrated control, reducing labor costs;

2. No need to add emulsifier, no secondary pollution, which belongs to clean production technology;

3. The outlet equipment occupies a small area, the treated water is efficient and stable, and the outlet water can be discharged and reused if it meets the standard;

4. Effectively reduce organic matter, minimize the amount of residues, and greatly reduce the cost of entrusting external enterprises to deal with them;

5. Perfectly realize oil-water separation, effectively recover oil products, and realize comprehensive utilization.

The whole process is fully automatic operation, which replaces the traditional biochemical and physical chemical processes, greatly reduces the final residue amount, and achieves the reduction, reuse and resource utilization in the production process to the greatest extent.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (9)

1. a waste emulsion treatment method, is characterized in that, comprises the following steps: (1) Waste emulsion heating: the waste emulsion is heated in a circulating environment to obtain a hot emulsion; (2) oil-water separation: the water vapor and grease in the hot emulsion are collected respectively, and the water vapor contains lipids with low boiling points; (3) condensed water collection: condensing the water vapor to obtain condensed water; (4) Purification of condensed water: filter the condensed water through an inorganic nano-hydrophilic membrane to obtain clean water with a COD content lower than 100 mg/L; Described step (1), step (2) and step (3) all carry out under negative pressure condition; The inorganic nano-hydrophilic membrane is prepared from one or more inorganic nanoparticles in SiO ₂ , TiO ₂ , ZnO, CdS, ZnS and Al ₂ O ₃ , and the inorganic nano-hydrophilic membrane is beneficial to water molecules and dissolved Sexual substances pass through and the pore size of the inorganic nano-hydrophilic membrane is less than 100nm; The grease that described step (2) obtains continues to get back in the environment of step (1) and heats up. 2. A method for treating waste emulsion according to claim 1, characterized in that the negative pressure condition is: vacuum pressure is -0.088MPa--0.053MPa, and heating temperature is: 50°C-80°C. 3. A method for treating waste emulsion according to claim 1 or 2, characterized in that, in the step (1), the heating method is steam heating. 4. A kind of waste emulsion treatment method according to claim 1, is characterized in that, in described step (4), condensed water is filtered by described inorganic nano-hydrophilic membrane under the environment of circulating flow. 5. A waste emulsion treatment device, characterized in that it comprises an evaporation heating chamber (2), and the evaporation heating chamber (2) is provided with a waste liquid inlet (21) and a first hot liquid outlet (24) and a second heating liquid outlet (24). Two hot liquid outlets (23); A separation chamber (3), the separation chamber (3) is provided with a hot liquid inlet (32), a hot oil outlet and a steam outlet, the first hot liquid outlet (24) is connected to the hot liquid inlet (32), the Both the second hot liquid outlet (23) and the hot oil outlet (33) are connected to the waste liquid inlet (21) through an efficient circulation pump (34); A condensation tower (4), the condensation tower (4) is provided with a steam inlet (42) and a condensate outlet (43); the steam outlet (31) is connected to the steam inlet (42); Inorganic nanometer hydrophilic membrane filter (5), described inorganic nanometer hydrophilic membrane filter (5) is provided with condensate inlet (53), described condensate outlet (43) and described condensate inlet (53) connected. 6. a kind of waste emulsion treatment device according to claim 5, is characterized in that, also comprises vacuum pump (45), described evaporation heating chamber (2) and described separation chamber (3) and described condensation tower ( 4) are all connected with vacuum pump (45). 7. A waste emulsion treatment device according to claim 6, characterized in that, the heights of the first hot liquid outlet (24) and the second hot liquid outlet (23) are lower than that of the waste emulsion. The height of the liquid inlet (21). 8. A kind of waste emulsion treatment device according to claim 7, characterized in that, the height of the steam outlet (31) is higher than that of the hot liquid inlet (32) and the hot oil outlet (33). high. 9. a kind of waste emulsion treatment device according to claim 5, is characterized in that, is provided with inorganic nanometer hydrophilic membrane in described inorganic nanometer hydrophilic membrane filter (5), and described inorganic nanometer hydrophilic membrane is used for For filtering condensate.