CN113979601B - Greasy dirt waste water treatment method - Google Patents
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C02F2101/30—Organic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2305/00—Use of specific compounds during water treatment
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- C02F2305/026—Fenton's reagent
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- C02F3/28—Anaerobic digestion processes
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
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Abstract
The application relates to the field of wastewater treatment, in particular to a method for treating greasy dirt wastewater. A greasy dirt waste water treatment method comprises the following steps: step 1): adding a pH regulator into the greasy dirt wastewater, regulating the pH of the greasy dirt wastewater to be 6.5-7.5, and standing; step 2): adding polydimethyl allyl ammonium chloride, polymeric ferric sulfate and polyoxyethylene ether, mixing with greasy dirt wastewater, and standing; wherein, the dosage of the polydimethyl allyl ammonium chloride is 38-65mg/L, the dosage of the polymeric ferric sulfate is 25-40mg/L, and the dosage of the polyoxyethylene ether is 68-75mg/L; step 3): pumping the upper liquid to an air floatation area; step 4): releasing bubbles, scraping the upper layer floating objects away, and carrying out subsequent biochemical reaction and Fenton reaction on the rest liquid; step 5): and (5) discharging. The application has the advantage of reducing the oil content in the wastewater.
Description
Technical Field
The application relates to the field of wastewater treatment, in particular to a method for treating greasy dirt wastewater.
Background
The environment protection is a behavior adopted by human beings for protecting the nature, is a main melody of the current society, and is one of social hot spots how to recycle.
In the field of automobiles, a large amount of engine oil can be used to produce a plurality of waste engine oil pots, most of engine oil pots are made of thermoplastic plastics, and after the engine oil pots are cleaned to remove greasy dirt, the engine oil pots can be recycled after being subjected to hot melting and granulation.
The output of the waste water containing greasy dirt is huge, and if the waste water is directly discharged without treatment, the production and the life of people can be seriously affected. If untreated greasy dirt wastewater flows into natural water, the dissolved oxygen in the water is reduced, and the aquatic plants die in large scale. If the greasy dirt waste water is taken to irrigate farmlands, the blockage of soil gaps can be caused, and air is not easy to enter the soil so as to influence photosynthesis of plants. Therefore, the treatment of greasy dirt wastewater is an urgent problem to be solved nowadays.
Disclosure of Invention
In order to reduce the oil content in the wastewater, the application provides a method for treating the greasy dirt wastewater.
The application provides a method for treating greasy dirt wastewater, which adopts the following technical scheme:
a greasy dirt waste water treatment method comprises the following steps:
step 1): adding a pH regulator into the greasy dirt wastewater, regulating the pH of the greasy dirt wastewater to be 6.5-7.5, and standing;
step 2): adding polydimethyl allyl ammonium chloride, polymeric ferric sulfate and polyoxyethylene ether, mixing with greasy dirt wastewater, and standing; wherein, the dosage of the polydimethyl allyl ammonium chloride is 38-65mg/L, the dosage of the polymeric ferric sulfate is 25-40mg/L, and the dosage of the polyoxyethylene ether is 68-78mg/L;
step 3): pumping the upper liquid to an air floatation area;
step 4): releasing bubbles, scraping the upper layer floating objects away, and carrying out subsequent biochemical reaction and Fenton reaction on the rest liquid;
step 5): and (5) discharging.
Through adopting above-mentioned technical scheme, under the joint cooperation of polydimethyl allyl ammonium chloride, polymeric ferric sulfate, polyoxyethylene ether, make greasy dirt waste water unstably flocculate, destroy interface property and the interfacial film intensity of profit for the profit is quick, easy separation, thereby reduces the oil content in the waste water.
Under the co-cooperation of the polydimethyl allyl ammonium chloride and the polyoxyethylene ether, the capability of the polyoxyethylene ether for weakening the interfacial film is further enhanced, and meanwhile, the polyoxyethylene ether penetrates into the water drops through the surface layer of the emulsified water drops, so that the protective layer of the polyoxyethylene ether is fragile and wrinkled to achieve the damage effect with wider damage range. The emulsified droplets approach and contact each other, form a mass of droplets that coalesce and separate from the continuous phase. The oily wastewater loses stability, and a subsequent series of reactions are easier and faster to carry out.
And then under the mutual coordination of the polydimethyl allyl ammonium chloride and the polymeric ferric sulfate, further compressing and destroying the double electric layers of an oil-water interface, so that emulsion drops mutually collide, coalesce and demulsifie to generate bridging and flocculation effects, and oil droplets with large particle sizes are formed, and a large number of oil droplets are gathered together. And after the oil droplets are separated from water, removing the demulsified floating oil by using air floatation equipment.
Preferably, the weight ratio of the polydimethyl allyl ammonium chloride to the polymeric ferric sulfate is 1: (0.60-0.75).
Through adopting above-mentioned technical scheme, the polydimethyl allyl ammonium chloride cooperates with polymeric ferric sulfate under specific proportion, has possessed stronger electric neutralization ability and stronger absorption bridging ability simultaneously, has improved the sedimentation rate, further improves the flocculation effect to oil drop in the greasy dirt waste water.
Preferably, the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1: (1.2-1.5).
Through adopting above-mentioned technical scheme, under specific proportion, polydimethyl allyl ammonium chloride and polyoxyethylene ether have better cooperation effect, and the polyoxyethylene ether weakens the ability of interface membrane and obtains improving greatly for a series of reactions follow-up are more quick, take place easily.
Preferably, the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1: (1.3-1.5).
Through adopting above-mentioned technical scheme, inject the proportion of polydimethyl allyl ammonium chloride, polyoxyethylene ether and polymeric ferric sulfate, under this specific restriction, each material can cooperate better to further improve the effect of cooperateing between each material, make oil-water separation speed faster, coverage wider.
Preferably, the pH is adjustedThe agent is NaOH and Na 2 CO 3 、H 2 SO 4 One or more of the following.
Preferably, in the step 2), polymeric ferric chloride is further added, and the weight ratio of polymeric ferric sulfate to polymeric ferric chloride is 1: (0.7-0.9).
By adopting the technical scheme, under the joint coordination of the polymeric ferric chloride and the polymeric ferric sulfate, the compactness of the floccule and the settling speed of the floccule are further improved, and the treatment time for separating the greasy dirt is shortened.
Preferably, before the step 1), the greasy dirt wastewater is discharged into a water collecting tank with a grating, and the sand-stone mixture and the sludge are separated; and then flows into the grit chamber to remove the important inorganic particles.
By adopting the technical scheme, the large sundries in the greasy dirt wastewater are removed, the workload of subsequent demulsification and air floatation is reduced, various raw materials can be fully contacted, and barriers are reduced.
Preferably, in the step 2), mixing and standing are performed at 55-65 ℃.
By adopting the technical scheme, the emulsion film becomes fragile under the treatment of various raw materials, and the enclosed water is heated to expand rapidly under proper heating conditions, so that the emulsion film is broken, and the demulsification time is further shortened.
In summary, the application has the following beneficial effects:
1. under the co-coordination of polydimethyl allyl ammonium chloride, polymeric ferric sulfate and polyoxyethylene ether, the oily wastewater is destabilized and flocculated, the interfacial property and interfacial film strength of oil-water are destroyed, so that the oil-water is separated quickly and easily, and the oil content in the wastewater is reduced.
2. Under the co-cooperation of the polymeric ferric chloride and the polymeric ferric sulfate, the compactness of the floccules and the settling speed of the floccules are further improved, and the treatment time for separating oil stains is shortened.
3. The emulsion film becomes fragile under the treatment of various raw materials, and the enclosed water rapidly expands under the proper heating condition, so that the emulsion film breaks, thereby further shortening the emulsion breaking time.
Detailed Description
The present application will be described in further detail with reference to examples.
The source information of the raw materials used in the following examples and comparative examples is shown in Table 1.
TABLE 1
| Raw materials | Model number | Source information |
| Polydimethallyl ammonium chloride | dn9026 | Shandong Denno New Material technology Co.Ltd |
| Polymeric ferric sulfate | / | Strengthening Jiangyuan Water purification Material Co.Ltd |
| Polyoxyethylene ether | 68441-17-8 | Nantong Runfeng petrochemical Co.Ltd |
| Polymeric ferric chloride | hc-jhlht001 | Wenzhou Hongcheng New Material Technology Co., Ltd. |
| Polyvinyl alcohol | 20211028 | Jinnan Yingxin chemical Co Ltd |
Examples
Example 1
A greasy dirt waste water treatment method comprises the following steps:
step 1): and discharging the greasy dirt wastewater after cleaning the engine oil kettle into a water collecting tank with a grid, so as to separate the sand and stone mixture from the sludge. In this embodiment, the grids are two, namely a coarse grid and a fine grid, and the greasy dirt wastewater passes through the coarse grid and then passes through the fine grid. The pitch width of the grid bars of the coarse grid is 20mm, and the gap width of the fine grid is 5mm. The flow rate of the oil sewage passing through the fence is 0.8m/s. Then flows into a cyclone sand basin to remove the important inorganic particles.
Step 2): and (3) introducing the greasy dirt wastewater into an adjusting tank, controlling the input quantity of the greasy dirt wastewater to be 1000L, and adding a corresponding pH regulator according to actual conditions. In this embodiment, the pH adjustor is Na 2 CO 3 Regulating the pH value of the greasy dirt wastewater to 7.0, and standing for 3 hours.
Step 3): introducing the greasy dirt wastewater into a sedimentation oil removal tank, regulating the heating temperature to 55 ℃, sequentially adding 38g of polydimethyl allyl ammonium chloride, 40g of polymeric ferric sulfate and 78g of polyoxyethylene ether into a sedimentation oil storage tank, stirring with the greasy dirt wastewater for 1.5h at the rotating speed of 45r/min, and standing for 4h.
Step 4): floating the oil residue on the upper layer, and recycling and pumping the upper layer liquid to the air floatation area; the larger suspended matters sink to the tank bottom, and the suspended matters at the tank bottom are removed. In this embodiment, the suspension at the bottom of the tank is pumped down by the sludge return pump to settle out the oil removal tank. The extracted suspended matters are separated by water separation machinery, and the separated water is put into a sedimentation oil storage tank for treatment.
Step 5): and starting an air floatation device of the air floatation area to release bubbles, wherein oil in the liquid is attached to the bubbles and floats to the surface along with the bubbles. Then scraping the upper layer floating objects by utilizing a scraper, and carrying out subsequent biochemical reaction and Fenton reaction on the rest liquid.
In this example, the biochemical reaction is: pumping the liquid into a hydrolysis tank through a lift pump, carrying out anaerobic hydrolysis on the liquid, hydrolyzing macromolecular organic matters into micromolecular organic matters by anaerobic bacteria, and then carrying out Fenton reaction.
The Fenton reaction is: discharging the liquid into a treatment tank, controlling pH to 3 and reaction temperature to 35deg.C, and adding 2ml/L H 2 O 2 And 0.5g/L FeSO 4 ·7H 2 O carries out deep oxidation treatment on the liquid.
Step 6): and detecting the processed liquid, and discharging the liquid after the liquid meets the standard.
Some of the data in this example are summarized in table 2.
Examples 2 to 3
A method for treating greasy dirt waste water is different from the embodiment 1 in that,
the pH regulator in the step 2) is selected, and the pH is regulated in a range;
the heating temperature in the step 3) and the input amount of the polydimethyl allyl ammonium chloride, the polymeric ferric sulfate and the polyoxyethylene ether.
The heating temperature, pH range, raw material selection and amount mentioned above are shown in Table 2 in detail.
TABLE 2
| Class of | Example 1 | Example 2 | Example 3 |
| Step 2) greasy dirt waste water (L) | 1000 | 1000 | 1000 |
| Polydimethallyl ammonium chloride (g) | 38 | 65 | 55 |
| Polymeric ferric sulfate (g) | 40 | 25 | 30 |
| Polyoxyethylene ether (g) | 78 | 68 | 75 |
| PH regulator | Na 2 CO 3 | NaOH | H 2 SO 4 |
| Step 1) pH Range | 7.0 | 7.5 | 6.5 |
| Heating temperature (. Degree. C.) | 55 | 65 | 60 |
Example 4
The oil-contaminated wastewater treatment method is different from example 3 in that the weight ratio of polydimethyl allyl ammonium chloride to polymeric ferric sulfate is 1:0.60, namely 53.1g of polydimethyl allyl ammonium chloride and 31.9g of polymeric ferric sulfate.
Example 5
The oil-contaminated wastewater treatment method is different from example 3 in that the weight ratio of polydimethyl allyl ammonium chloride to polymeric ferric sulfate is 1:0.75 g, namely 48.6g of polydimethyl allyl ammonium chloride and 36.4g of polymeric ferric sulfate.
Example 6
The oil-contaminated wastewater treatment method is different from example 3 in that the weight ratio of polydimethyl allyl ammonium chloride to polymeric ferric sulfate is 1:0.85, namely, the input of polydimethallyl ammonium chloride was 46g and the input of polymeric ferric sulfate was 39g.
Example 7
The oil stain wastewater treatment method is different from the embodiment 3 in that the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1:1.2, namely, the amount of added polydimethallyl ammonium chloride was 59.1g, and the amount of added polyoxyethylene ether was 70.9g.
Example 8
The oil stain wastewater treatment method is different from the embodiment 3 in that the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1:1.5, namely, the amount of added polydimethallyl ammonium chloride was 52g, and the amount of added polyoxyethylene ether was 78g.
Example 9
The oil stain wastewater treatment method is different from the embodiment 5 in that the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1:1.3, namely, the dosage of the polydimethyl allyl ammonium chloride is 52.5g, the dosage of the polymeric ferric sulfate is 39.3g, and the dosage of the polyoxyethylene ether is 68.2g.
Example 10
The oil stain wastewater treatment method is different from the embodiment 5 in that the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1:1.5, namely, the dosage of the polydimethyl allyl ammonium chloride is 49.2g, the dosage of the polymeric ferric sulfate is 36.9g, and the dosage of the polyoxyethylene ether is 73.8g.
Example 11
The oil stain wastewater treatment method is different from the embodiment 10 in that the step 3) is also added with polymeric ferric chloride, and the weight ratio of polymeric ferric sulfate to polymeric ferric chloride is 1: the charged amount of 0.7, namely, 34.4g of polymeric ferric chloride.
Example 12
The oil stain wastewater treatment method is different from the embodiment 10 in that the step 3) is also added with polymeric ferric chloride, and the weight ratio of polymeric ferric sulfate to polymeric ferric chloride is 1: the charged amount of 0.9, i.e., the polymeric ferric chloride was 44.2g.
Comparative example
Comparative example 1
A method for treating greasy dirt waste water is different from example 3 in that polydimethyl allyl ammonium chloride is replaced by equivalent polyvinyl alcohol.
Comparative example 2
A method for treating greasy dirt waste water is different from example 3 in that polymeric ferric sulfate is replaced by an equivalent amount of aluminum sulfate.
Comparative example 3
A method for treating greasy dirt waste water is different from example 3 in that polyoxyethylene ether is replaced by equal amount of carbon tetrachloride.
Comparative example 4
A method for treating oily wastewater, which is different from example 3 in that the dosage of polydimethyl allyl ammonium chloride is 100g, the dosage of polymeric ferric sulfate is 10g and the dosage of polyoxyethylene ether is 40g.
Comparative example 5
The oil stain wastewater treatment method is different from the embodiment 3 in that the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1:0.5, namely 86g of polydimethyl allyl ammonium chloride and 46g of polyoxyethylene ether.
Comparative example 6
The oil stain wastewater treatment method is different from the embodiment 3 in that the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1:2.5, namely, the amount of added polydimethallyl ammonium chloride was 37g, and the amount of added polyoxyethylene ether was 93g.
Performance test
1. And (3) oil content detection: the oil-contaminated wastewater of examples 1-11 and comparative examples 1-4 before treatment and when standing for 2 hours in step 3) after air floatation was detected and the oil content was recorded according to SY-T5329-1994 "clastic rock reservoir Water quality recommendation index and analysis method".
2. The drainage of examples 1-11 and comparative examples 1-4 was examined according to GB8978-1996 Integrated wastewater discharge Standard.
The test data for runs 1-2 are detailed in Table 3.
TABLE 3 Table 3
As can be seen from comparison of the test data of examples 1-3 and comparative examples 1-4 in Table 3, the oil content of the greasy dirt wastewater treated in examples 1-3 has been greatly reduced after air floatation, and the greasy dirt wastewater meets the discharge standard when discharged. And when the reaction mixture is kept stand for 2 hours in the step 3), the oil content is reduced to be lower, and the treatment speed is obviously faster than that of the treatment speeds of the comparative examples 1-4. The oil-water separation device has the advantages that under the joint coordination of the polydimethyl allyl ammonium chloride, the polymeric ferric sulfate and the polyoxyethylene ether, oil-water is rapidly separated, the coverage range is wide, and the oil removal effect and the oil removal efficiency are good.
As can be seen from comparison of the detection data of examples 4-5 and comparative examples 1-4 in Table 3, the oil content of examples 4-5 after standing for 2h and air floatation in step 3) is far smaller than that of comparative examples 1-4, which means that the oil-water separation speed of the greasy dirt wastewater treated by examples 4-5 is faster, the strength is higher, and the oil removal effect is better. The weight ratio of the polydimethyl allyl ammonium chloride to the polymeric ferric sulfate is 1: and (0.60-0.75), the two can be better matched, and the flocculation effect on oil drops of the greasy dirt wastewater is further improved.
Whereas in example 6, the weight ratio of polydimethallyl ammonium chloride to polymeric ferric sulfate was not 1: in the range of (0.60-0.75), the data for the various aspects of example 6 are worse than for examples 4-5, and the data for the various aspects of example 6 are closer to examples 1-3, indicating that the weight ratio of polydimethallyl ammonium chloride to polymeric ferric sulfate is 1: a preferable compounding effect can be achieved in the range of (0.60-0.75).
As can be seen from comparison of the test data of examples 7-8 and comparative examples 1-4 in Table 3, the oil removal rate and oil removal efficiency of examples 7-8 are significantly better than those of comparative examples 1-4, and the inventors have further improved the compounding effect of polydiallyl ammonium chloride and polyoxyethylene ether after further optimizing the input ratio of the two.
As can be seen from comparison of the test data of examples 7-8 and comparative examples 4-5 in Table 3, the weight ratio of polydimethallyl ammonium chloride to polyoxyethylene ether in comparative examples 4-5 is not 1: the input amount of the two is not in the optimal range within the range of (1.2-1.5), and the treatment effect of the wastewater on the greasy dirt is obviously reduced.
As is clear from comparison of the test data of examples 9 to 10 and comparative examples 1 to 4 in Table 3, the oil removal rate and oil removal efficiency can be further improved by further limiting the ratio of polyoxyethylene ether to poly (dimethylsilyl ammonium chloride) and poly (ferric sulfate) while limiting the ratio of the poly (dimethylsilyl ammonium chloride) to poly (ferric sulfate). The combination of the three components can be fully exerted under the combination of specific proportion, thereby improving the oil removal performance.
As can be seen from comparison of the test data of examples 11-12 and comparative examples 1-4 in Table 3, after adding the polymeric ferric chloride and defining the proportion of the remaining polymeric ferric sulfate, the degreasing ability and efficiency of the oily wastewater are improved.
The oil removing capability of the oil pollution wastewater in the embodiments 1-12 is greatly improved, the requirements on subsequent biochemical reactions and Fenton reactions are reduced, and the efficiency of the whole process is greatly improved.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (5)
1. The greasy dirt waste water treatment method is characterized by comprising the following steps of:
step 1): adding a pH regulator into the greasy dirt wastewater, regulating the pH of the greasy dirt wastewater to be 6.5-7.5, and standing;
step 2): adding polydimethyl allyl ammonium chloride, polymeric ferric sulfate and polyoxyethylene ether, mixing with greasy dirt wastewater, and standing; wherein, the dosage of the polydimethyl allyl ammonium chloride is 38-65mg/L, the dosage of the polymeric ferric sulfate is 25-40mg/L, and the dosage of the polyoxyethylene ether is 68-78mg/L;
step 3): pumping the upper liquid to an air floatation area;
step 4): releasing bubbles, scraping the upper layer floating objects away, and carrying out subsequent biochemical reaction and Fenton reaction on the rest liquid;
step 5): an outer row;
the weight ratio of the polydimethyl allyl ammonium chloride to the polymeric ferric sulfate is 1: (0.60-0.75);
the weight ratio of the polydimethyl allyl ammonium chloride to the polyoxyethylene ether is 1: (1.3-1.5).
2. The method for treating oil-contaminated wastewater according to claim 1, wherein: the pH regulator is NaOH or Na 2 CO 3 、H 2 SO 4 One or more of the following.
3. The method for treating oil-contaminated wastewater according to claim 1, wherein: and 2) adding polymeric ferric chloride, wherein the weight ratio of the polymeric ferric sulfate to the polymeric ferric chloride is 1: (0.7-0.9).
4. The method for treating oil-contaminated wastewater according to claim 1, wherein: before the step 1), discharging the greasy dirt wastewater into a water collecting tank with a grating, and separating a sand-stone mixture and sludge; and then flows into the grit chamber to remove the important inorganic particles.
5. The method for treating oil-contaminated wastewater according to claim 1, wherein: in the step 2), mixing and standing are carried out under the condition of 55-65 ℃.
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