CN111807561A - Reduction process for oil-containing and solid-containing wastewater - Google Patents

Reduction process for oil-containing and solid-containing wastewater Download PDF

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Publication number
CN111807561A
CN111807561A CN202010736122.2A CN202010736122A CN111807561A CN 111807561 A CN111807561 A CN 111807561A CN 202010736122 A CN202010736122 A CN 202010736122A CN 111807561 A CN111807561 A CN 111807561A
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China
Prior art keywords
oil
solid
water
tank
content
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Pending
Application number
CN202010736122.2A
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Chinese (zh)
Inventor
杨卓华
罗玮学
姜珊
娄希民
王聪毛
谢茂奇
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Sichuan Huajie Jiaye Environmental Protection Technology Co ltd
Jereh Environmental Protection Technology Co Ltd
Original Assignee
Sichuan Huajie Jiaye Environmental Protection Technology Co ltd
Jereh Environmental Protection Technology Co Ltd
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Priority to CN202010736122.2A priority Critical patent/CN111807561A/en
Publication of CN111807561A publication Critical patent/CN111807561A/en
Pending legal-status Critical Current

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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56Macromolecular compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F2001/007Processes including a sedimentation step
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00General aspects of water treatment
    • C02F2301/08Multistage treatments, e.g. repetition of the same process step under different conditions

Abstract

The invention discloses a reduction process for oil-containing and solid-containing wastewater, which comprises the following steps: introducing the oil-water mixed gas into primary sedimentation separation equipment, and dividing the oil-water mixed gas into high-oil content waste water, low-solid content waste water and low-oil content and high-solid content waste water; conveying the low-oil-content and high-solid-content wastewater to stirring flocculation equipment to form a flocculation liquid; conveying the flocculation liquid to a plate-and-frame filter press to form filter pressing residue-filter cake and filter pressing liquid; conveying the press filtrate to a secondary settling tank for settling separation to enable oil, water and solids to be layered; discharging the floating oil to a primary oil tank, performing sedimentation separation again to further separate oil and water to obtain clean oil, discharging the clean oil to water treatment equipment, and discharging bottom slag to sludge concentration equipment; directly discharging high-oil-content and low-solid-content waste water into a primary oil tank, standing and settling, discharging oil into a finished oil tank, discharging water into water treatment equipment, and discharging bottom slag into sludge concentration equipment. The invention reduces the influence of the waste water on the operation and maintenance of downstream equipment, improves the recovery rate of oil products and improves the profit margin.

Description

Reduction process for oil-containing and solid-containing wastewater
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a reduction process for oil-containing and solid-containing wastewater.
Background
At present, in the process of disposing oily wastes, thermal desorption equipment can generate a large amount of oily and solid-containing wastewater, water in raw materials is mixed into circulating water along with continuous operation of the equipment, the amount of the wastewater is gradually increased, oil solid scum is suspended in the wastewater, a water circulating channel is blocked, the recovery of oil products is influenced, and the oil solid scum must be periodically discharged to ensure the continuous operation of the thermal desorption equipment. But the wastewater can be discharged into a pipe network of a sewage treatment plant after being treated by matched water treatment equipment to reach the standard. In the practical application process, the oily and solid wastewater is found to hardly reach the discharge index after the water treatment equipment is disposed, and the operation and maintenance burden of the water treatment equipment is increased. If the water treatment equipment receives waste water of other production lines at the same time, the operation of the whole plant area equipment can be influenced by the condition. Moreover, the standard treatment of the waste water of the thermal desorption equipment is a difficult problem in the industry.
Therefore, a process for reducing and treating the waste water containing oil and solids is urgently needed between thermal desorption equipment and water treatment equipment to ensure the normal operation of each equipment.
Disclosure of Invention
The invention aims to provide a reduction process for oil-containing and solid-containing wastewater, and mainly aims to solve the problems of oil content and solid content of wastewater generated by the conventional thermal desorption equipment. Aiming at the properties of the wastewater and the influence of the wastewater on thermal desorption equipment, water treatment equipment and oil recovery equipment, a reduction process used among the equipment is designed, so that the influence of the wastewater on the operation and maintenance of downstream equipment is reduced, the recovery rate of oil products is improved, and the profit margin is improved.
In order to solve the technical problem, the invention adopts the following scheme:
a reduction process for oily and solid-containing wastewater comprises the following steps:
s1: introducing the oil-water mixed gas into primary settling separation equipment, and dividing the oil-water mixed gas into high-oil-content and low-solid-content wastewater and low-oil-content and high-solid-content wastewater, namely two types of wastewater with high oil content, low solid content, low oil content and high solid content;
s2: conveying the low-oil-content and high-solid-content wastewater to stirring flocculation equipment to form a flocculation liquid;
s3: conveying the flocculation liquid to a plate-and-frame filter press to form filter pressing residue-filter cake and filter pressing liquid;
s4: conveying the filter-pressed low-solid-content solid-pressure filtrate to a secondary settling tank for settling separation to separate oil, water and solids;
s5: and discharging the floating oil to the primary oil tank, and performing sedimentation separation again to further separate oil and water to obtain clean oil.
Further, in the step S2, the method further includes the step S21: directly conveying the high-oil-content and low-solid-content waste water to a primary oil tank for settlement separation, after oil and water are separated, slowly overflowing the obtained clean oil to a cache oil tank along with the increase of the liquid level, then intensively pumping the clean oil to a finished oil tank, and discharging the water to water treatment equipment.
Further, when the step S2 is performed, the flocculation reagent is added into the stirring flocculation device through the PAC dosing device and the PAM dosing device, the variable frequency stirrer is equipped to stir, the stirring speed is 600-.
Further, the filter pressing residue-filter cake is conveyed to a raw material storage area at regular time and is mixed with the raw material, stirred and repeatedly disposed.
Further, a filter pressing cache tank is additionally arranged between the second-stage settling tank and the plate-and-frame filter press, the filter pressing cache tank temporarily stores filter pressing liquid, all the filter pressing liquid in the filter pressing cache tank is discharged into the second-stage settling tank, the settling separation time of the second-stage settling tank is 4-5 hours, the water after the settling separation is discharged into water treatment equipment, and a small amount of bottom slag is discharged into sludge concentration equipment or returned into stirring flocculation equipment.
Further, the pressure filtrate in the pressure filtration buffer tank is periodically conveyed to a secondary sedimentation tank, sedimentation separation is carried out under the action of self gravity, oil, water and solid are layered, and the three-phase liquid level of the oil, the water and the solid is determined through an interface sensor and a test valve on the secondary sedimentation tank.
Further, the floating oil on the uppermost layer is conveyed to the primary oil tank through a diaphragm pump, and the floating oil is settled and separated again for 3-5 hours.
Furthermore, by arranging an overflow function in the primary oil tank, clean oil slowly overflows to the buffer oil tank along with the increase of the liquid level, and then is intensively pumped to the product oil tank, and water is discharged to the water treatment equipment.
The invention has the following beneficial effects:
1. the low-oil-content and high-solid-content waste water generated by thermal desorption equipment is collected in a unified way, and is discharged into a plate-and-frame filter press after dosing and stirring flocculation equipment, the solid phase returns to an oil-containing waste raw material area again after filter pressing for mixing and disposal, and the low-solid-content liquid phase after filter pressing enters a buffer water tank and is periodically discharged into a large-scale settling storage tank for settling separation. And discharging the top floating oil after settling separation to a secondary buffer oil tank, discharging the separated low-index wastewater into a plant area water treatment facility, and discharging a small amount of bottom slag into matched sludge concentration equipment. And standing and settling the floating oil discharged to the secondary cache oil tank to obtain clean oil, discharging the clean oil to the cache oil tank for temporary storage by an overflow method, then intensively pumping the clean oil to a finished product oil tank, discharging the wastewater to water treatment equipment, and discharging the bottom slag to sludge concentration equipment. Directly discharging high-oil-content and low-solid-content waste water generated by thermal desorption equipment into a secondary cache oil tank, after settling separation, discharging clean oil into a finished product oil tank, discharging the waste water into water treatment equipment, and discharging bottom slag into sludge concentration equipment. The oil-water separation device has the advantages that two different kinds of oil-containing and solid-containing waste water are separated, treatment efficiency is improved, oil-water sedimentation separation is carried out for multiple times, oil-water separation is carried out to the maximum extent, water reaches the discharge standard, the oil recovery rate is improved, profit margin is improved, processes among thermal desorption equipment, water treatment equipment and recovered oil equipment are reduced, and the influence of waste water on operation, maintenance and protection of downstream equipment is reduced.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a specific process flow;
FIG. 3 is a schematic flow diagram of the process equipment.
Reference numerals: the method comprises the following steps of 1-PAC dosing device, 2-PAM dosing device, 3-primary sedimentation separation equipment, 4-stirring flocculation equipment, 5-plate and frame filter press, 6-filter pressing buffer tank, 7-secondary sedimentation tank, 8-water treatment equipment, 9-sludge concentration equipment, 10-primary oil tank, 11-buffer oil tank and 12-finished oil tank.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited to these examples.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", and the like indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, or that are conventionally placed when the product of the present invention is used, and are used only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "open," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
As shown in fig. 1-3, a process for reducing the amount of oil-containing and solid-containing wastewater comprises two treatment processes, wherein the first process route is to separate oil-water mixed gas generated by thermal desorption equipment into high-oil-containing wastewater, low-solid-containing wastewater, low-oil-containing wastewater and high-solid-containing wastewater through a primary sedimentation separation equipment 3 to generate a large amount of oil-water-solid mixture wastewater; conveying the low-oil-content and high-solid-content wastewater into stirring flocculation equipment 4, adding clear water into a PAC dosing device 1 and a PAM dosing device 2, uniformly mixing with a flocculation reagent, adding a fluid flocculation reagent into the stirring flocculation equipment 4, stirring by using a variable frequency stirrer at a stirring speed of 600-650r/min for 6.5h, and finally stirring to form a flocculation liquid; conveying the flocculating solution to a plate-and-frame filter press 5 by a variable-frequency conveying pump to form filter pressing residue-filter cake and filter pressing liquid; delivering the filter pressing liquid to a filter pressing buffer tank 6, and temporarily storing the filter pressing liquid; conveying the filter pressing residue-filter cake to a raw material storage area at regular time, mixing and stirring the filter pressing residue-filter cake with the raw material, and repeatedly disposing; then the pressure filtrate in the filter-pressing buffer tank 6 is periodically conveyed to a second-stage settling tank 7 for settling separation, before the second-stage settling tank 7 is subjected to settling separation, the pressure filtrate in the filter-pressing buffer tank 6 is completely discharged into a second-stage settling tank 4, the settling separation time of the second-stage settling tank 7 is 4-5h, two second-stage settling tanks 7 are provided, the pressure filtrate is subjected to settling separation under the action of self gravity, so that oil, water and solid are layered, the three-phase liquid level of oil, water and solid is determined through an interface sensor and a test valve on the second-stage settling tank 7, the water after settling separation is discharged to a water treatment device 8, a small amount of bottom slag is discharged to a sludge concentration device 9 or returned to a stirring flocculation device 4, the oil is floating oil at the uppermost layer, the floating oil is conveyed to a primary oil tank 10 through a diaphragm pump for settling separation again, the time of the floating oil for settling separation again, the oil and the water are further separated to obtain clean oil, the number of the primary oil tanks 10 is two, the clean oil slowly overflows to the buffer oil tank 11 for temporary storage along with the increase of the liquid level by configuring an overflow function in the primary oil tanks 10, the clean oil is then intensively pumped to the finished oil tank 12, and the water is discharged to the water treatment equipment 8.
The second process route is that the high oil content and low solid content waste water is directly conveyed to a primary oil tank 10 for settlement separation, after the oil and water are separated, the obtained clean oil slowly overflows to a buffer oil tank 11 for temporary storage along with the increase of the liquid level, and then is intensively pumped to a finished product oil tank 12, and the water is discharged to a water treatment device 8. Through two process routes, two different kinds of oily, solid waste water containing water separating treatment are carried out, the treatment efficiency is improved, oil and water sedimentation separation is carried out for many times, oil-water separation is carried out to the maximum, water reaches the emission standard, the oil recovery rate is improved, the profit margin is improved, the processes among thermal desorption equipment, water treatment equipment 8 and recovered oil equipment are reduced, and the influence of waste water on the operation, maintenance and protection of downstream equipment is reduced. The PAC chemical adding device 1, the PAM chemical adding device 2, the primary sedimentation separation equipment 3, the stirring flocculation equipment 4, the plate-and-frame filter press 5, the filter pressing buffer tank 6, the secondary sedimentation tank 7, the water treatment equipment 8, the sludge concentration equipment 9, the primary oil tank 10, the buffer oil tank 11, the finished product oil tank 12, the interface sensor, the test valve, the diaphragm pump, the variable frequency stirrer and the variable frequency delivery pump are all the existing known equipment and accessories, the specific working principle and the connection structure are well known to those skilled in the art, the using method can be known without effort, the equipment are mutually connected through pipelines according to the process sequence, and the accessories are arranged in the corresponding equipment, so that the process flow can be realized, and the method specifically comprises the following steps: the inlet end of the primary sedimentation separation equipment 3 is communicated with an air outlet pipeline of external thermal desorption equipment, the outlet end of the primary sedimentation separation equipment 3 is communicated with the inlet end of stirring flocculation equipment 4, a PAC dosing device 1 and a PAM dosing device 2 are communicated with a clear water pipeline, the outlet end of the PAC dosing device is communicated with the stirring flocculation equipment 4 through a pipeline, a variable frequency stirrer and a variable frequency conveying pump are arranged in the stirring flocculation equipment 4, the outlet of the variable frequency conveying pump is communicated with a plate and frame filter press 5, the plate and frame filter press 5 is respectively communicated with a raw material storage area and a filter pressing cache tank 6 through pipelines, the outlet pipeline of the filter pressing cache tank 6 is communicated with a secondary sedimentation tank 7, a water outlet, a slag discharge port and a diaphragm pump are arranged in the secondary sedimentation tank 7, the water outlet is communicated with water treatment equipment 8, the slag discharge port is communicated with sludge treatment equipment, the primary oil tank 10 is provided with an overflow hole communicated with the buffer oil tank 11, the outlet of the buffer oil tank 11 is communicated with a finished oil tank 12, and a water outlet on the finished oil tank 12 is communicated with the water treatment device 8.
The working principle of the invention is as follows: firstly, the low oiliness that produces thermal desorption equipment, the high solid waste water that contains are collected in unison, through adding medicine, stirring flocculation equipment 4 after, discharge into plate and frame filter press 5, and the solid phase returns oily waste material raw materials district thoughtlessly to mix the disposition again behind the filter-pressing, and the low solid liquid phase that contains after the filter-pressing gets into filter-pressing buffer tank 6, regularly discharges to large-scale second grade settling cask 7 and subsides the separation. And discharging the top floating oil after settling separation to a primary oil tank 10, discharging the separated low-index wastewater into plant area water treatment equipment 8, and discharging a small amount of bottom slag into matched sludge concentration equipment 9. After the floating oil discharged to the primary oil tank 10 is settled, the oil is discharged to the finished oil tank 12, the water is discharged to the water treatment equipment 8, and the bottom slag is discharged to the sludge concentration equipment 9.
And directly discharging high-oil-content and low-solid-content waste water generated by thermal desorption equipment into a primary oil tank 10, discharging oil into a finished oil tank 12 after standing and settling, discharging water into water treatment equipment 8, and discharging bottom slag into sludge concentration equipment 9.
The foregoing is only a preferred embodiment of the present invention, and the present invention is not limited thereto in any way, and any simple modification, equivalent replacement and improvement made to the above embodiment within the spirit and principle of the present invention still fall within the protection scope of the present invention.

Claims (8)

1. The reduction process of the oil-containing and solid-containing wastewater is characterized by comprising the following steps of:
s1: introducing the oil-water mixed gas into a primary sedimentation separation device (3) to separate the oil-water mixed gas into high-oil-content and low-solid-content wastewater and low-oil-content and high-solid-content wastewater;
s2: conveying the low-oil-content and high-solid-content wastewater to stirring flocculation equipment (4) to form a flocculation liquid;
s3: conveying the flocculation liquid to a plate-and-frame filter press (5) to form filter pressing residue-filter cake and filter pressing liquid;
s4: conveying the press filtrate to a secondary settling tank (7) for settling separation to separate oil, water and solid;
s5: and discharging the floating oil to a primary oil tank (10), and performing sedimentation separation again to further separate oil and water to obtain clean oil.
2. The process of claim 1, further comprising step S21 in step S2: directly conveying the high-oil-content and low-solid-content waste water to a primary oil tank (10) for sedimentation separation.
3. The process for reducing the amount of oily and solid wastewater as claimed in claim 1, wherein step S2 is performed while adding the flocculating agent into the stirring flocculation equipment (4) through the PAC dosing device (1) and the PAM dosing device (2), and the stirring is performed by a variable frequency stirrer with a stirring speed of 600-.
4. The process for reducing the amount of oily and solid-containing wastewater according to claim 1, wherein in step S3, the filter-press residue-filter cake is periodically sent to a raw material storage area, mixed with raw material and stirred for repeated disposal.
5. The reduction process of the oil-containing and solid-containing wastewater according to claim 1, characterized in that a filter-pressing buffer tank (6) is additionally arranged on the secondary settling tank (7) and the plate-and-frame filter press (5) for temporarily storing filter-pressing liquid, the filter-pressing liquid in the filter-pressing buffer tank (6) is discharged into the secondary settling tank (7), the settling separation time of the secondary settling tank (7) is 4-5h, the water after settling separation is discharged into a water treatment device (8), and a small amount of bottom slag is discharged into a sludge concentration device (9) or returned into a stirring flocculation device (4).
6. The process for reducing the amount of the wastewater containing oil and solid according to claim 5, wherein the pressure-filtered liquid in the pressure-filtering buffer tank (6) is periodically conveyed to the secondary settling tank (7), the pressure-filtered liquid is settled and separated under the action of gravity to separate oil, water and solid into layers, and the liquid level of the three phases of oil, water and solid is determined through an interface sensor and a test valve on the secondary settling tank (7).
7. The process for reducing the amount of oily and solid wastewater according to claim 1, wherein in step S5, the floating oil is transported to the primary oil tank (10) by a diaphragm pump, and the floating oil is separated again by settling for 3-5 h.
8. The process for reducing the amount of oily and solid waste water according to claim 1, wherein in step S5, the primary tank (10) is configured with an overflow function, so that the net oil slowly overflows to the buffer tank (11) along with the increase of the liquid level and is then centrally pumped to the product tank (12), and the water is discharged to the water treatment facility (8).
CN202010736122.2A 2020-07-28 2020-07-28 Reduction process for oil-containing and solid-containing wastewater Pending CN111807561A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112607984A (en) * 2020-12-24 2021-04-06 杰瑞环保科技有限公司 Method for treating rolling oil sludge
CN117096550A (en) * 2023-10-19 2023-11-21 珙县华洁危险废物治理有限责任公司成都分公司 Method for recovering oil-containing waste film from wet lithium battery diaphragm by dropping liquid

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101875518A (en) * 2010-07-01 2010-11-03 陈启松 Treatment method of stainless steel pickling waste water
CN104710048A (en) * 2015-03-31 2015-06-17 邓声荣 Zero-emission process for treating waste water on metallic surface
CN207418444U (en) * 2017-09-26 2018-05-29 上海格林曼环境技术有限公司 A kind of wastewater treatment equipment for contaminated site in-situ immobilization engineering
CN110117104A (en) * 2019-06-12 2019-08-13 陕西国防工业职业技术学院 A kind of water base no-pollution treatment technique of well-drilling waste sludge of oil-containing

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101875518A (en) * 2010-07-01 2010-11-03 陈启松 Treatment method of stainless steel pickling waste water
CN104710048A (en) * 2015-03-31 2015-06-17 邓声荣 Zero-emission process for treating waste water on metallic surface
CN207418444U (en) * 2017-09-26 2018-05-29 上海格林曼环境技术有限公司 A kind of wastewater treatment equipment for contaminated site in-situ immobilization engineering
CN110117104A (en) * 2019-06-12 2019-08-13 陕西国防工业职业技术学院 A kind of water base no-pollution treatment technique of well-drilling waste sludge of oil-containing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112607984A (en) * 2020-12-24 2021-04-06 杰瑞环保科技有限公司 Method for treating rolling oil sludge
CN117096550A (en) * 2023-10-19 2023-11-21 珙县华洁危险废物治理有限责任公司成都分公司 Method for recovering oil-containing waste film from wet lithium battery diaphragm by dropping liquid
CN117096550B (en) * 2023-10-19 2024-01-26 珙县华洁危险废物治理有限责任公司成都分公司 Method for recovering oil-containing waste film from wet lithium battery diaphragm by dropping liquid

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