CN112759138A - Method for removing oil stain in oily wastewater - Google Patents
Method for removing oil stain in oily wastewater Download PDFInfo
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- CN112759138A CN112759138A CN202110048842.4A CN202110048842A CN112759138A CN 112759138 A CN112759138 A CN 112759138A CN 202110048842 A CN202110048842 A CN 202110048842A CN 112759138 A CN112759138 A CN 112759138A
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- wastewater
- oil
- adsorbent
- flocculation reaction
- liquid
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- C—CHEMISTRY; METALLURGY
- 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
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- C—CHEMISTRY; METALLURGY
- 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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- C—CHEMISTRY; METALLURGY
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
Abstract
The invention provides a method for removing oil stains in oily wastewater, belonging to the technical field of sewage treatment. Mixing the oily wastewater, a pH regulator, a flocculating agent and a coagulant aid for flocculation reaction, and performing solid-liquid separation to obtain liquid after the flocculation reaction; mixing the liquid after the flocculation reaction with an adsorbent, and performing adsorption treatment to obtain a mixed liquid containing the adsorbent; and filtering the mixed liquid containing the adsorbent through a ceramic composite membrane to obtain the deoiled wastewater. The method provided by the invention has high oil stain removal rate.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a method for removing oil stains in oily wastewater.
Background
Electroplating, as an important basic processing industry in China, but a large amount of wastewater is generated in the electroplating process, the components of the electroplating wastewater are complex, the wastewater contains heavy metal ions such as chromium, zinc, copper, nickel, cadmium and the like and impurities with high toxicity such as acid, alkali, cyanide and the like, and the domestic electroplating wastewater is mainly divided into seven types according to the water quality condition and the requirement of resource recovery at present: the pretreatment of oily wastewater, mixed wastewater, cyanide-containing wastewater, nickel-containing wastewater, chemical nickel wastewater, chromium-containing wastewater and comprehensive wastewater. If the waste water is directly discharged into the water body without being treated, a series of hazards can be brought.
At present, under the theme of environmental protection of clean production and energy conservation and emission reduction, people pay more and more attention to the effect of environmental protection on economic and social development, corresponding environmental laws and regulations are successively issued in recent years by the country, a water pollution prevention action plan is negotiated in 2015, and environmental taxes are collected in 2018. Therefore, the recycling, metal recovery and zero discharge process of electroplating wastewater are receiving more and more attention and attention. The membrane separation technology is increasingly applied to the oil-water separation process, metal contained in the electroplating wastewater can be precipitated to obtain sludge rich in heavy metal and then recycled, but a certain amount of oil contained in the electroplating wastewater has a very adverse effect on the subsequent membrane technology treatment, so that the membrane is easily blocked and polluted, the membrane treatment capacity is reduced, and the service life of the membrane is shortened.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for removing oil stains from oil-containing wastewater, and the method provided by the present invention has a high oil stain removal rate.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for removing oil stains in oily wastewater comprises the following steps:
mixing the oily wastewater, a pH regulator, a flocculating agent and a coagulant aid for flocculation reaction, and performing solid-liquid separation to obtain liquid after the flocculation reaction;
mixing the liquid after the flocculation reaction with an adsorbent, and performing adsorption treatment to obtain a mixed liquid containing the adsorbent;
and filtering the mixed liquid containing the adsorbent through a ceramic composite membrane to obtain the deoiled wastewater.
Preferably, the oily wastewater is wastewater generated in an electroplating process, and oil stain in the oily wastewater is 5-1000 mg/L
Preferably, the flocculant is polyaluminium chloride, polyferric sulfate or polyaluminium ferric chloride, and the coagulant aid is polyacrylamide.
Preferably, the dosage ratio of the flocculating agent to the coagulant aid to the oily wastewater is 0.05-20 kg: 0.001-0.1 kg: 1m3。
Preferably, the pH value of the flocculation reaction is 6-12.
Preferably, the adsorbent is at least one of diatomaceous earth, activated carbon, and calcium carbide.
Preferably, the dosage ratio of the adsorbent to the liquid after the flocculation reaction is 0.1-10 kg: 1m3。
Preferably, the ceramic composite membrane has a pore diameter of 2-100 nm.
Preferably, the pressure of the filtration is 0.02-0.2 MPa, and the water flux of the filtration is 0.1-5 m3/m2H, wherein the oil content of the wastewater after oil removal is 0.1-5 mg/L.
The beneficial technical effects are as follows: the invention provides a method for removing oil stains in oily wastewater, which comprises the following steps of mixing the oily wastewater, a pH regulator, a flocculating agent and a coagulant aid for flocculation reaction, and carrying out solid-liquid separation to obtain liquid after the flocculation reaction; mixing the liquid after the flocculation reaction with an adsorbent, and performing adsorption treatment to obtain a mixed liquid containing the adsorbent; and filtering the mixed liquid containing the adsorbent through a ceramic composite membrane to obtain the deoiled wastewater. The adsorbent adopted by the invention has good adsorption effect on the oil stains in the electroplating wastewater. The ceramic composite membrane adopted by the invention has narrow and fine pore size distribution, higher thermal stability and corrosion resistance, the effluent quality is higher by adopting the ceramic composite membrane to filter, micron-sized suspended matters or soluble solids in the wastewater can be separated, and a strong-corrosivity chemical cleaning agent can be used for ensuring high membrane permeation flux and recovery rate when the electroplating wastewater is treated. The method for removing the oil stain in the oily wastewater provided by the invention can be stably operated for a long time in some environments with extremely severe use conditions, has good production benefit, is suitable for large-scale technological application, and has strong practicability.
Detailed Description
The invention provides a method for removing oil stains in oily wastewater, which comprises the following steps:
mixing the oily wastewater, a pH regulator, a flocculating agent and a coagulant aid for flocculation reaction, and performing solid-liquid separation to obtain liquid after the flocculation reaction;
mixing the liquid after the flocculation reaction with an adsorbent, and performing adsorption treatment to obtain a mixed liquid containing the adsorbent;
and filtering the mixed liquid containing the adsorbent through a ceramic composite membrane to obtain the deoiled wastewater.
The invention mixes the oily wastewater, the pH regulator and the flocculating agent for flocculation reaction, and then carries out solid-liquid separation to obtain the liquid after the flocculation reaction.
In the invention, the oily wastewater is wastewater generated in an electroplating process, and oil stain in the oily wastewater is 5-1000 mg/L.
In the present invention, the flocculant is preferably polyaluminium chloride, polyferric sulfate or polyaluminium ferric chloride, preferably polyaluminium chloride. In the invention, the dosage ratio of the flocculating agent to the oily wastewater is preferably 0.05-20 kg: 1m3More preferably 0.05 to 10 kg: 1m3Most preferably 0.05 to 5 kg: 1m3。
In the present invention, the coagulant aid is preferably polyacrylamide. The dosage ratio of the coagulant aid to the oily wastewater in the invention is preferably 0.001-0.1 kg: 1m3More preferably 0.001 to 0.05: 1m3。
In the present invention, when the flocculant is polyaluminium chloride and the coagulant aid is polyacrylamide, the mass ratio of the polyaluminium chloride to the polyacrylamide is preferably 50: 1.
The invention adds the flocculating agent to ensure that the sludge in the sewage forms larger alum flocs which can not only adsorb and remove partial oil stains, but also accelerate the sedimentation of the sludge.
In the invention, the pH value of the flocculation reaction is preferably 6-12, and more preferably 8-10. In the invention, the pH regulator is preferably caustic soda flakes, liquid caustic soda, lime and lime milk. The dosage of the pH regulator is not specially limited, and the pH value required by the flocculation reaction can be achieved.
After the flocculation reaction, the present invention preferably stands the mixture after the flocculation reaction and then performs solid-liquid separation to obtain the liquid after the flocculation reaction. In the invention, the standing time is preferably 4-6 h. The specific time of standing is not specially limited, and solid and liquid can be layered. The solid-liquid separation method of the present invention is not particularly limited, and a solid-liquid separation method known to those skilled in the art may be selected.
In the invention, the content of the oil stain in the liquid after the flocculation reaction is preferably 5-100 mg/L. After the liquid after the flocculation reaction is obtained, the liquid after the flocculation reaction is mixed with the adsorbent for adsorption treatment, and the mixed liquid containing the adsorbent is obtained.
In the present invention, the adsorbent is preferably at least one of diatomaceous earth, activated carbon, and calcium carbide. When the adsorbent is a mixture of two or more kinds, the amount ratio of each component in the adsorbent mixture is not particularly limited, and the components may be mixed at any ratio.
In the invention, the dosage ratio of the adsorbent to the liquid after the flocculation reaction is preferably 0.1-10 kg: 1m3More preferably 0.1 to 5 kg: 1m3Most preferably 0.2 to 1 kg: 1m3. The adsorbent disclosed by the invention has a good adsorption effect on oil stains in oil-containing wastewater.
In the present invention, the method of mixing the liquid after the flocculation reaction with the adsorbent is preferably aeration mixing. In the invention, the time of aeration mixing is preferably 15-30 min, and more preferably 20-25 min.
After the mixed liquid containing the adsorbent is obtained, the mixed liquid containing the adsorbent is filtered through the ceramic composite membrane to obtain the waste water after oil removal.
In the present invention, the pore diameter of the ceramic composite membrane is preferably 2 to 100nm, more preferably 30 to 70nm, and most preferably 40 to 50 nm.
In the invention, the pressure of the filtration is preferably 0.02-0.2 MPa, more preferably 0.1-0.15 MPa, and the water flux of the filtration is preferably 0.1-5 m3/m2H, more preferably 1 to 1.5m3/m2H; the filtering time is preferably 1.5-20 h, more preferably 5-15 h, and most preferably 8-12 h. The oil content of the waste water after oil removal is preferably 0.1-5 mg/L.
The ceramic composite membrane adopted by the invention has narrow and fine pore size distribution, higher thermal stability and corrosion resistance, the effluent quality is higher by adopting the ceramic composite membrane to filter, micron-sized suspended matters or soluble solids in the wastewater can be separated, and a strong-corrosivity chemical cleaning agent can be used for ensuring high membrane permeation flux and recovery rate when the electroplating wastewater is treated. The method for removing the oil stain in the oily wastewater provided by the invention can be stably operated for a long time in some environments with extremely severe use conditions, has good production benefit, is suitable for large-scale technological application, and has strong practicability.
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
Electroplating comprehensive waste water with oil content of 100mg/L for 20m3Pumping into a reaction tank, adding sodium hydroxide to adjust the pH value of the wastewater to 9.3, adding 20kg and 0.4kg of PAC and PAM respectively, standing for natural precipitation for 4h to obtain a supernatant, wherein the oil content in the supernatant is 17.8 mg/L.
Discharging and collecting supernatant, adding 20kg of activated carbon into the collected supernatant, mixing and adsorbing for 20min to obtain waste liquid containing the activated carbon.
Filtering the waste liquid containing activated carbon by a ceramic composite membrane with an area of 0.4 square meter and a pore diameter of 100nm, controlling the pressure of the ceramic composite membrane at 0.08MPa during filtering, controlling the water quantity penetrating through the ceramic membrane at 95%, and increasing the water yield to 1.2m when the filtering is started3/m2H, continuous transportAfter 13h, the water production flux was still 0.8m3/m2H. And filtering for 24 hours to obtain the deoiled wastewater. The detection shows that the concentration of the oil stain in the wastewater after oil removal is less than 1mg/L, and more than 95 percent of oil can be removed. The water flux produced by the ceramic composite membrane after chemical cleaning can be recovered to 1.2m3/m2·h。
Example 2
20m of electroplating comprehensive wastewater containing 40mg/L of oil3Pumping into a reaction tank, adding lime to adjust the pH value of the wastewater to 8.5, adding 1kg and 0.02kg of PAC and PAM respectively, standing for natural precipitation for 5h to obtain a supernatant, wherein the oil content in the supernatant is 9.3 mg/L.
Discharging and collecting supernatant, adding 5kg of activated carbon into the collected supernatant, mixing and adsorbing for 20min to obtain waste liquid containing the activated carbon.
Filtering the waste liquid containing activated carbon by a ceramic composite membrane with an area of 0.4 square meter and an aperture of 20nm, controlling the pressure of the ceramic composite membrane at 0.1MPa during filtering, controlling the water amount penetrating through the ceramic membrane at 90%, and increasing the water yield to 1.2m when the filtering is started3/m2H, after 13h of continuous operation, the water production flux is still 0.9m3/m2H. And filtering for 24 hours to obtain the deoiled wastewater. The detection shows that the concentration of the oil stain in the wastewater after oil removal is 0.5mg/L, and more than 95 percent of oil can be removed. The water flux produced by the ceramic composite membrane after chemical cleaning can be recovered to 1.2m3/m2·h。
Example 3
969.3mg/L electroplating comprehensive wastewater containing oil 20m3Pumping into a reaction tank, adding lime milk to adjust the pH value of the wastewater to 8.5, adding 200kg and 1kg of PAC and PAM respectively, standing and naturally precipitating for 6h to obtain supernatant, wherein the oil content in the supernatant is 89.3 mg/L.
And discharging and collecting supernatant, adding 100kg of diatomite into the collected supernatant, mixing and adsorbing for 20min to obtain waste liquid containing activated carbon.
Filtering the waste liquid containing diatomite with ceramic composite membrane with area of 0.4 square meter and pore diameter of 50nm, controlling pressure at 0.2MPa, and allowing the waste liquid to permeate through the ceramic composite membraneThe water quantity of the ceramic membrane is controlled to be 85 percent, and the water yield is up to 0.8m when the filtration is started3/m2H, after 13h of continuous operation, the water production flux is still 0.5m3/m2H. And filtering for 24 hours to obtain the deoiled wastewater. The detection shows that the concentration of the oil stain in the wastewater after oil removal is 0.91mg/L, and more than 99% of oil can be removed. The water flux produced by the ceramic composite membrane after chemical cleaning can be recovered to 0.8m3/m2·h。
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A method for removing oil stains in oily wastewater is characterized by comprising the following steps:
mixing the oily wastewater, a pH regulator, a flocculating agent and a coagulant aid for flocculation reaction, and performing solid-liquid separation to obtain liquid after the flocculation reaction;
mixing the liquid after the flocculation reaction with an adsorbent, and performing adsorption treatment to obtain a mixed liquid containing the adsorbent;
and filtering the mixed liquid containing the adsorbent through a ceramic composite membrane to obtain the deoiled wastewater.
2. The method according to claim 1, wherein the oily wastewater is wastewater generated in an electroplating process, and the oil stain is one or more of animal oil, vegetable oil and mineral oil; the content of oil stains in the oily wastewater is 5-1000 mg/L.
3. The method of claim 1, wherein the flocculant is polyaluminum chloride, polyferric sulfate, or polyaluminum ferric chloride, and the coagulant aid is polyacrylamide.
4. A method according to claim 1 or 3, characterized in that said method comprisesThe dosage ratio of the flocculating agent to the coagulant aid to the oily wastewater is 0.05-20 kg: 0.001-0.1 kg: 1m3。
5. The method according to claim 1, wherein the flocculation reaction has a pH of 6 to 12.
6. The method of claim 1, wherein the sorbent is at least one of diatomaceous earth, activated carbon, and calcium carbide.
7. The method according to claim 1 or 6, wherein the dosage ratio of the adsorbent to the liquid after the flocculation reaction is 0.1-10 kg: 1m3。
8. The method according to claim 1, wherein the pore size of the ceramic composite membrane is 2-100 nm.
9. The method according to claim 1, wherein the pressure of the filtration is 0.02-0.2 MPa, and the water flux of the filtration is 0.1-5 m3/m2H, wherein the oil content of the wastewater after oil removal is 0.1-5 mg/L.
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| CN202110048842.4A CN112759138A (en) | 2021-01-14 | 2021-01-14 | Method for removing oil stain in oily wastewater |
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| CN202110048842.4A CN112759138A (en) | 2021-01-14 | 2021-01-14 | Method for removing oil stain in oily wastewater |
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Cited By (2)
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| CN113480058A (en) * | 2021-08-13 | 2021-10-08 | 苏州融和福天宝环保科技有限责任公司 | Treatment method of electroplating degreasing wastewater |
| CN115536119A (en) * | 2022-11-01 | 2022-12-30 | 新疆聚力环保科技有限公司 | Waste water treatment agent for waste oil regeneration and preparation method thereof |
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