CN114956442A - Oil-removing pretreatment method for oil-containing organic wastewater - Google Patents
Oil-removing pretreatment method for oil-containing organic wastewater Download PDFInfo
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- CN114956442A CN114956442A CN202110199528.6A CN202110199528A CN114956442A CN 114956442 A CN114956442 A CN 114956442A CN 202110199528 A CN202110199528 A CN 202110199528A CN 114956442 A CN114956442 A CN 114956442A
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- oil
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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
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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
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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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
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention discloses an oil removal pretreatment method of oily organic wastewater, which comprises the following steps: a. taking residual sludge generated by a biochemical system as a flocculation source of air flotation and mixing the residual sludge with the oily organic wastewater to generate air flotation; b. firstly mixing the oil-containing organic wastewater with excess sludge generated by a biochemical system, then adding a flocculating agent to enable the excess sludge to generate flocs, and adsorbing grease in the wastewater by using the flocs generated by flocculation to realize oil removal pretreatment of the oil-containing organic wastewater; c. and (4) carrying out biochemical treatment on the wastewater after the oil removal pretreatment to remove organic matters in the wastewater to generate excess sludge. The method reduces the dosage of chemical flocculant; the oil removal efficiency of oil removal pretreatment is improved by utilizing the biological adsorption of the biochemical sludge, the amount of oil substances entering a living system is reduced, the biochemical treatment difficulty is reduced, and the amount of the biochemical sludge is reduced.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to an oil-removing pretreatment method for oil-containing organic wastewater.
Background
The components of the oil substances are complex and are generally difficult to biodegrade. If the sewage contains oil substances, the oil substances in the sewage need to be pretreated firstly, so that the oil substances are prevented from entering a biochemical treatment unit. The common treatment process for treating the oily wastewater comprises the following steps: gravity separation, air flotation, filtration, adsorption, membrane, and the like.
The principle of the oil removing process is that gas is introduced into oily wastewater, so that emulsified oil particles in the water adhere to generated fine bubbles and float to the water surface together with the bubbles to form scum, thereby removing oil substances in the water. The air floatation method can remove oil drops with the particle size of more than 10 mu m in the wastewater. The air floatation method has good effect and mature process, and aims to improve the oil removal efficiency of the air floatation; coagulant is added at the front end of the air floatation to coagulate the oil in the wastewater and the coagulant. The method is used for treating the low-concentration oily wastewater. In recent years, an ultrafiltration system is gradually introduced to treat oily wastewater, and in the actual operation process, an ultrafiltration device is frequently cleaned, the cleaning water discharge is large, the treatment load of the system is increased, and the operation cost and the maintenance cost are high.
The air flotation needs to add a flocculating agent additionally to flocculate oil substances in the wastewater, the floc adsorbs microbubbles to generate scum, the cost of the flocculating agent added by the air flotation is high, the cost of a conventional flocculating agent is high for chemical agents, and new pollutants are introduced in the wastewater treatment process. Therefore, the chemical flocculant added by external aid is reduced, the oil removal pretreatment effect of air flotation is improved, and the method is a reasonable route for popularizing the oil removal pretreatment of the oil-containing organic wastewater.
The publication number is: CN 110240324 a, which is an air flotation device with oil-water separation function, provides a method of adding an ozone oxidation area in air flotation to separate oil from water by using ozone, and using ozone to improve the coagulation property of organic matters, so that the waste water after oil-water separation is convenient for coagulation precipitation before being introduced into an inner cylinder, thereby enhancing the sewage treatment effect. The method adopts ozone to enhance the air flotation effect, but the ozone generation cost is high, the scale of an ozone generator equipped with the air quantity required by air flotation is large, but the cost of the method is high.
The publication number is: CN 110092515 a, chinese patent document provides "electrocoagulation-micro-nano air flotation-ceramic membrane treatment oily wastewater system and treatment method" the method adopts ceramic membrane filtration in air flotation effluent, the method adopts membrane filtration as a filtration device, the problems of membrane blockage and membrane cleaning and replacement are not solved, the method has the disadvantages of membrane blockage and tedious cleaning, and the membrane cleaning and replacement process can cause interruption of the treatment process, but the method cannot be operated stably for a long time.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides an oil-removing pretreatment method of oily organic wastewater.
In order to achieve the aim, the invention provides an oil removal pretreatment method of oily organic wastewater, which comprises the following steps:
a. taking residual sludge generated by a biochemical system as a flocculation source of air flotation and mixing the residual sludge with the oily organic wastewater to generate air flotation;
b. firstly mixing the oil-containing organic wastewater with excess sludge generated by a biochemical system, then adding a flocculating agent to enable the excess sludge to generate flocs, and adsorbing grease in the wastewater by using the flocs generated by flocculation to realize oil removal pretreatment of the oil-containing organic wastewater;
c. and (4) carrying out biochemical treatment on the wastewater after the oil removal pretreatment to remove organic matters in the wastewater to generate excess sludge.
Further, the biochemical system comprises a biological anaerobic system, a facultative system and an aerobic system.
Further, in step b, the flocculant is cationic polyacrylamide.
Further, the bubble diameter of the bubbles in the air flotation in the step a is less than 50 μm.
Further, the dissolved oxygen concentration of the air flotation effluent in the step a is more than 0.5 mg/L.
Further, the pH range of the air floatation operation in the step a is 4.0-11.0.
Compared with the prior art, the invention has the following beneficial effects: the invention relates to a method for pre-treating oil-containing organic wastewater, which utilizes biochemical excess sludge generated by the organic wastewater as a flocculation source of air flotation, adds a flocculating agent to enable the excess sludge to generate flocs, and utilizes the flocs generated by flocculation to adsorb grease in the wastewater so as to realize the pre-treatment of oil-containing organic wastewater; the dosage of the chemical flocculant is reduced; the oil removal efficiency of oil removal pretreatment is improved by utilizing the biological adsorption of the biochemical sludge, the amount of oil substances entering a living system is reduced, the biochemical treatment difficulty is reduced, and the amount of the biochemical sludge is reduced.
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the respective embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides a method for pretreating oily organic wastewater in a preferred embodiment, which comprises the following steps:
a. taking residual sludge generated by a biochemical system (the residual sludge is residual biochemical sludge generated in the biochemical system, and is partial or all of the residual biochemical sludge) as a flocculation source of air flotation and mixing the residual sludge with the oily organic wastewater to generate air flotation;
b. mixing the oil-containing organic wastewater with excess sludge generated by a biochemical system, adding a flocculating agent to enable the excess sludge to generate flocs, and adsorbing grease in the wastewater by using the flocs generated by flocculation to realize oil removal pretreatment of the oil-containing organic wastewater;
c. and (4) carrying out biochemical treatment on the wastewater after the oil removal pretreatment to remove organic matters in the wastewater to generate excess sludge.
Preferably, the biochemical system comprises one or more of a biological anaerobic system, a facultative system and an aerobic system.
Preferably, in step b the flocculant is a cationic polyacrylamide.
Preferably, the bubble diameter of the bubbles in the air flotation in the step a is less than 50 μm.
Preferably, the dissolved oxygen concentration of the air flotation effluent in the step a is more than 0.5 mg/L.
Preferably, the pH range of the air floatation operation in the step a is 4.0-11.0.
The method utilizes biochemical excess sludge generated by organic wastewater as a flocculation source of air flotation, a flocculating agent is added to enable the excess sludge to generate flocs, and the flocs generated by flocculation are utilized to adsorb grease in the wastewater, so that oil removal pretreatment of the oil-containing organic wastewater is realized; the dosage of the chemical flocculant is reduced; the oil removal efficiency of the oil removal pretreatment is improved by utilizing the biological adsorptivity of the biochemical sludge, the amount of oil substances entering a living system is reduced, the biochemical treatment difficulty is reduced, and the amount of the biochemical sludge is reduced.
Example (b):
the embodiment adopts the method to pretreat the maleic anhydride wastewater, and the wastewater quantity is 12m 3 H is used as the reference value. The maleic anhydride wastewater contains isobutanol, glacial acetic acid, acrylic acid, vinyl-cyclobutane and diisobutyl hexahydrophthalate. The COD of the normal drainage of the production device is higher than 4.0 multiplied by 10 4 mg/L, strongly acidic pH<1.5. Wherein the diisobutyl hexahydrophthalate is colorless transparent oily liquid, is insoluble in water, is not easy to volatilize, and has slightly aromatic odor. The conventional air flotation oil removal process for adding PAC and PAM (polyacrylamide with the Chinese name of PAM) is adopted to pretreat the waste water, the oil content of air flotation effluent is more than 50mg/L, and diisobutyl hexahydrophthalate cannot be completely removed, so that the operation of a subsequent biochemical system is difficult. The oil-removing pretreatment of the wastewater is transformed into an oil-containing organic wastewater oil-removing pretreatment method. The residual biochemical sludge of the biochemical system flows back to enter the air flotation, and the backflow amount is 20m 3 And h, stopping adding PAC, and changing the negative polyacrylamide into the cationic polyacrylamide as the flocculating agent for air floatation. The floating slag of the air floatation is filtered and pressed by a stack-screw filter press. By the method, the content of petroleum in the air-floatation effluent is less than 0.5mg/L, the amount of alkali used for neutralizing the front-end wastewater is reduced by 20 percent, and the COD of the air-floatation effluent is less than 1.0 multiplied by 10 4 mg/L, the sludge output of the sewage treatment system stabilized by the biochemical treatment at the later stage is reduced from 2 tons/day to 1 ton/day.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the method avoids the addition of PAC, reduces the sludge yield in the sewage treatment process and improves the oil removal efficiency of air flotation.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.
Claims (6)
1. An oil removal pretreatment method of oily organic wastewater is characterized by comprising the following steps:
a. taking residual sludge generated by a biochemical system as a flocculation source of air flotation and mixing the residual sludge with the oily organic wastewater to generate air flotation;
b. firstly mixing the oil-containing organic wastewater with excess sludge generated by a biochemical system, then adding a flocculating agent to enable the excess sludge to generate flocs, and adsorbing grease in the wastewater by using the flocs generated by flocculation to realize oil removal pretreatment of the oil-containing organic wastewater;
c. and (4) carrying out biochemical treatment on the wastewater after the oil removal pretreatment to remove organic matters in the wastewater to generate excess sludge.
2. The oil removal pretreatment method of oily organic wastewater according to claim 1, characterized in that: the biochemical system comprises a biological anaerobic system, a facultative system and an aerobic system.
3. The oil removal pretreatment method of oily organic wastewater according to claim 1, characterized in that: in step b the flocculant is a cationic polyacrylamide.
4. The oil removal pretreatment method of oily organic wastewater according to claim 1, characterized in that: the bubble diameter of the bubbles in the air flotation in the step a is less than 50 μm.
5. The oil removal pretreatment method of oily organic wastewater according to claim 1, characterized in that: in the step a, the dissolved oxygen concentration of the air flotation effluent is more than 0.5 mg/L.
6. The oil removal pretreatment method of oily organic wastewater according to claim 1, characterized in that: in the step a, the pH range of the air floatation operation is 0.0-14.0.
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| CN202110199528.6A CN114956442A (en) | 2021-02-22 | 2021-02-22 | Oil-removing pretreatment method for oil-containing organic wastewater |
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| CN202110199528.6A CN114956442A (en) | 2021-02-22 | 2021-02-22 | Oil-removing pretreatment method for oil-containing organic wastewater |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009087921A1 (en) * | 2008-01-11 | 2009-07-16 | Asahi Organic Chemicals Industry Co., Ltd. | Method for treating oil-containing waste water and apparatus for treating oil-containing waste water |
| JP2015009165A (en) * | 2013-06-26 | 2015-01-19 | 株式会社神鋼環境ソリューション | Processing apparatus and processing method of oil-containing water |
| JP2017070894A (en) * | 2015-10-06 | 2017-04-13 | 新日鐵住金株式会社 | Oil-containing wastewater treatment method |
| JP2019037956A (en) * | 2017-08-28 | 2019-03-14 | 水ｉｎｇ株式会社 | Method and device for water treatment of organic wastewater containing oil |
| CN110143644A (en) * | 2019-06-18 | 2019-08-20 | 山东美陵中联环境工程有限公司 | Excess sludge adsorbs oil removing process |
-
2021
- 2021-02-22 CN CN202110199528.6A patent/CN114956442A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009087921A1 (en) * | 2008-01-11 | 2009-07-16 | Asahi Organic Chemicals Industry Co., Ltd. | Method for treating oil-containing waste water and apparatus for treating oil-containing waste water |
| JP2015009165A (en) * | 2013-06-26 | 2015-01-19 | 株式会社神鋼環境ソリューション | Processing apparatus and processing method of oil-containing water |
| JP2017070894A (en) * | 2015-10-06 | 2017-04-13 | 新日鐵住金株式会社 | Oil-containing wastewater treatment method |
| JP2019037956A (en) * | 2017-08-28 | 2019-03-14 | 水ｉｎｇ株式会社 | Method and device for water treatment of organic wastewater containing oil |
| CN110143644A (en) * | 2019-06-18 | 2019-08-20 | 山东美陵中联环境工程有限公司 | Excess sludge adsorbs oil removing process |
Non-Patent Citations (1)
| Title |
|---|
| 吴向阳: "《水污染控制工程及设备》", 中国环境出版社, pages: 148 - 149 * |
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