CN118993386A - Turbid circulating water filtering device and method - Google Patents

Abstract

The present invention provides a turbid water filtering device and method, belonging to the technical field of turbid water treatment, wherein the device includes an inlet dosing system, a filtering system and an outlet system; the inlet dosing system includes an inlet pipe connected to the turbid water pool, a dosing pipe connected to the inlet section of the inlet pipe, and a demulsifier storage box connected to the dosing pipe; the filtering system includes at least three filter tanks connected in series, an oil collector arranged at the top of the filter tank, an oil collecting pipeline connected to the top of the oil collector, a filter tank water inlet arranged at the upper part of one side wall of the filter tank, and a filter tank water outlet arranged at the lower part of the other side wall; a filter core is arranged inside the filter tank; the filter tank water inlet of the first filter tank in the filtering system is connected to the outlet port of the inlet pipe; the outlet system includes an outlet pipe connected to the outlet of the last filter tank. The present invention can solve the problems of poor turbid water oil removal effect, low treatment efficiency, high cost, difficult maintenance, and environmental pollution in the prior art.

Description

Turbid circulating water filtering device and method

Technical Field

The invention relates to the technical field of turbid circulating water treatment, in particular to a turbid circulating water filtering device and a turbid circulating water filtering method.

Background

When the continuous casting production of the steel mill is operated, the lubrication system needs to spray the oil-gas mixture to the roller way, and the oil finally flows into the turbid circulating water system. When the production line equipment body is lubricated, part of oil can also be leaked and flow into the turbid circulating water system. The turbid circulating water with the oil content exceeding the standard can cause oil bloom on the surface of a finished steel coil, and the steel coil is unevenly cooled and unstable in strength. If the oily wastewater is untreated or improperly treated, not only can the waste of water resources be caused, but also serious pollution to the environment can be caused. In addition, the high-oil-content wastewater is easy to corrode and block pipelines and equipment during recycling, and the efficiency and the service life of the equipment are affected.

The prior art degreasing method for turbid circulating water generally comprises a physical sedimentation method, an air floatation method, a chemical treatment method and a biological treatment method. Wherein,

The physical sedimentation method is to make oil drop float naturally by utilizing the characteristic that oil is lighter than water, and then collect greasy dirt by an oil scraping device. The method is suitable for larger oil drops, has poor effect on tiny oil drops and emulsified oil, and has longer treatment time.

The air-float method is to inject compressed air into water to form tiny bubbles, and adsorb oil drops on the bubbles to float to the water surface for collection. This method is more efficient than the sedimentation method, but it is still difficult to remove the minute oil droplets and the emulsified oil, and requires specialized equipment and maintenance.

The chemical treatment method is to agglomerate or emulsify oil drops by using chemical agents, and then remove the oil drops by sedimentation or air floatation. The method can effectively remove the greasy dirt, but has higher cost and is easy to produce secondary pollution.

The biological treatment method is to decompose greasy dirt by utilizing microorganisms, is suitable for low-concentration oily wastewater, but has longer treatment period and higher requirement on water quality.

In summary, the existing degreasing method for turbid circulating water has the problems of poor degreasing effect, low treatment efficiency, high cost, difficult maintenance, environmental pollution and the like.

Disclosure of Invention

In view of the above problems, the present invention aims to provide a turbid circulating water filtering device and method, so as to solve the problems of poor degreasing effect, low treatment efficiency, high cost, difficult maintenance, environmental pollution and the like in the degreasing method of turbid circulating water in the prior art.

The invention provides a turbid circulating water filtering device which is used for filtering and removing out-of-standard greasy dirt in a turbid circulating water system; comprises a water inlet dosing system, a filtering system and a water outlet system; wherein,

The water inlet and dosing system comprises a water inlet pipe connected with the turbid circulating water pool, a dosing pipe connected with a water inlet section of the water inlet pipe and a demulsifier medicine storage box connected with a dosing end of the dosing pipe;

The filtering system comprises at least three filtering tanks connected in series, an oil collector arranged at the top end of each filtering tank, an oil collecting pipeline connected with the top end of the oil collector, a filtering tank water inlet arranged at the upper part of one side wall of each filtering tank and a filtering tank water outlet arranged at the lower part of the other side wall of each filtering tank; a filter element is arranged in each filter tank; a filter tank water inlet of a first filter tank in the filter system is connected with a water outlet port of the water inlet pipe;

The water outlet system comprises a water outlet pipe connected with a filter tank water outlet of a last filter tank in the filter system; and a water outlet port of the water outlet pipe is connected with the turbid circulating water pool.

In addition, the number of the filtering tanks is preferably three, and the three filtering tanks are a pretreatment tank, a core oil removal tank and an enhanced oil removal tank in sequence according to the flowing route of turbid circulating water; the filter core of the pretreatment tank comprises a primary ceramic material layer arranged below a water inlet of the filter tank of the pretreatment tank and a secondary ceramic material layer arranged between the lower part of the primary ceramic material layer and the inner bottom end of the pretreatment tank; wherein the primary ceramic material layer is composed of ceramic materials with the particle size of 0.3-0.5 mm; the secondary ceramic material layer is composed of ceramic materials with the particle size of 0.5-1 mm; the filter element of the core oil removal tank is made of a selectively permeable membrane material; the filter core of the core oil removal tank is arranged between the lower part of the water inlet of the filter tank of the core oil removal tank and the inner bottom end of the core oil removal tank; the filter element of the reinforced oil removal tank is arranged between the lower part of the water inlet of the filter tank of the reinforced oil removal tank and the upper part of the water outlet of the filter tank.

Furthermore, preferably, the device further comprises a backwashing system; wherein the backwash system comprises backwash pipes connected to the canister outlets of each canister in the filtration system.

Furthermore, it is preferable that adjacent filter tanks in the filter system are connected by a communication water pipe; a communication valve is arranged on the communication water pipe; and a back flush valve is arranged on the back flush pipe.

In addition, the preferable scheme is that the water inlet end of the back flushing pipe is connected with a back flushing main pipe, and the water inlet end of the back flushing main pipe is provided with a back flushing main pipe control valve.

In addition, the preferable scheme is that a turbid circulating water inlet valve is arranged at the water inlet port of the water inlet pipe; and/or a dosing pump is arranged on the dosing tube close to the demulsifier medicine storage box; and/or a dosing control valve is arranged on the dosing pipe; and/or a pump body is arranged on the water outlet section of the water inlet pipe; and/or a turbid circulating water outlet valve is arranged on the water inlet pipe close to the water outlet port; and/or a temperature detection meter and a pressure meter are arranged at the water outlet of the water inlet pipe.

In addition, the preferable scheme is that a first sampling tube is arranged on the water outlet section of the water inlet tube; a first sampling valve is arranged on the first sampling tube.

In addition, the preferable scheme is that a flowmeter is arranged on the water outlet pipe and close to the water outlet of the last filtering tank; and/or a filtered water outlet valve is arranged on the water outlet pipe close to the turbid circulating water tank; and/or a second sampling valve is arranged on the water outlet pipe.

In addition, preferably, an observation window and an oil collecting pipeline control valve are arranged on the oil collecting pipeline of each filtering tank; the oil stain outlet of the oil collecting pipeline of each filtering tank is connected with the same oil stain discharging pipe.

The invention provides a turbid circulating water filtering method, which adopts the turbid circulating water filtering device to carry out greasy dirt filtering treatment on oily turbid circulating water, and comprises the following steps:

s1, enabling turbid circulating water containing oil to be filtered to enter the water inlet pipe from a turbid circulating water tank;

s2, enabling the demulsifier in the demulsifier medicine storage box to enter a water inlet section of the water inlet pipe according to a preset amount, and mixing the demulsifier with turbid circulating water in the water inlet section;

s3, enabling the turbid oily circulating water mixed with the demulsifier to enter the filtering system through the water inlet pipe;

s4, in the filtering system, the oily turbid circulating water sequentially flows through each filtering tank and is filtered by a filtering core in each filtering tank, and greasy dirt collected by each filtering tank from the oily turbid circulating water is discharged through an oil collecting pipeline; and finally, the turbid circulating water which sequentially passes through each filtering tank to remove the greasy dirt flows back to the turbid circulating water tank from the water outlet port of the last filtering tank through the water outlet pipe.

According to the technical scheme, the turbid circulating water filtering device and method provided by the invention have the advantages that the multi-stage oil removal filtering of the oily turbid circulating water added with the demulsifier is realized by combining the water inlet dosing system with the filtering system formed by at least three filtering tanks, so that suspended particles and oil drops in the oily turbid circulating water are ensured to be removed, and the oil removal effect is good; the invention can rapidly and efficiently remove the greasy dirt from the turbid circulating water system through the structural design of the water inlet dosing system, the filtering system and the water outlet system, and has short treatment period and high efficiency compared with the methods of physical sedimentation, air flotation, chemical treatment, biological treatment and the like in the prior art; the whole device is easy to clean and maintain, and equipment downtime caused by blockage and abrasion is reduced; compared with the prior art, the invention greatly reduces the dependence on chemical treatment agents, thereby reducing the overall cost of the treatment process; and ensures that no secondary pollution is generated or secondary pollution is reduced as much as possible in the treatment process, and meets the requirements of environmental protection regulations and green sustainable development.

To the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Furthermore, the invention is intended to include all such aspects and their equivalents.

Drawings

Other objects and attainments together with a more complete understanding of the invention will become apparent and appreciated by referring to the following description taken in conjunction with the accompanying drawings. In the drawings:

FIG. 1 is a schematic view of a turbid circulating water filter apparatus according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a pretreatment tank according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a core oil removal tank according to an embodiment of the present invention;

FIG. 4 is a schematic view of a reinforced oil removal tank according to an embodiment of the present invention;

fig. 5 is a flowchart of a turbid circulating water filtering method according to an embodiment of the invention.

In the drawing, 11-inlet pipe, 111-turbid circulating water inlet valve, 112-pump body, 113-turbid circulating water outlet valve, 114-temperature detection meter, 115-pressure meter, 12-dosing pipe, 121-dosing pump, 122-dosing control valve, 13-demulsifier medicine storage tank, 21-filter tank, 211-pretreatment tank, 2111-first-stage ceramic material layer, 2112-second-stage ceramic material layer, 212-core oil removal tank, 2121-core oil removal tank filter core, 213-enhanced oil removal tank, 2131-enhanced oil removal tank filter core, 22-oil collector, 23-oil collection pipe, 231-observation window, 232-oil collection pipe control valve, 24-water inlet, 25-water outlet, 26-communication water pipe, 261-communication valve, 31-water outlet pipe, 32-flowmeter, 33-filtered water outlet valve, 34-second sampling valve, 41-backwash pipe, 411-backwash valve, 42-backwash main pipe, 421-backwash control valve, 51-first sampling pipe, 511-first sampling valve, 6-dirty oil drain pipe.

The same reference numerals will be used throughout the drawings to refer to similar or corresponding features or functions.

Detailed Description

In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. It may be evident, however, that such embodiment(s) may be practiced without these specific details.

Aiming at the problems of poor oil removal effect, low treatment efficiency, high cost, difficult maintenance, environmental pollution and the like in the oil removal method of turbid circulating water in the prior art, the device and the method for filtering turbid circulating water are provided.

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In order to illustrate the turbid circulating water filtering device and method provided by the invention, fig. 1 shows the structure of a turbid circulating water filtering device according to an embodiment of the invention; FIG. 2 shows the structure of a pretreatment tank according to an embodiment of the present invention; FIG. 3 illustrates a structure of a core tank according to an embodiment of the present invention; FIG. 4 illustrates a structure of a reinforced de-oiling tank according to an embodiment of the present invention; fig. 5 shows a flow of a turbid circulating water filtering method according to an embodiment of the invention.

As shown in fig. 1 to 5 together, the turbid circulating water filtering device provided by the invention is used for filtering and removing out-of-standard greasy dirt in a turbid circulating water system; comprises a water inlet dosing system, a filtering system and a water outlet system; wherein,

The water inlet and dosing system comprises a water inlet pipe 11 connected with the turbid circulating water pool, a dosing pipe 12 connected with a water inlet section of the water inlet pipe 11 and a demulsifier medicine storage box 13 connected with a dosing end of the dosing pipe 12;

The filtration system comprises at least three filtration tanks 21 connected in series, an oil collector 22 provided at the top end of each filtration tank 21, an oil collecting pipe 23 connected to the top end of the oil collector 22, a filtration tank water inlet 24 provided at the upper part of one side wall of each filtration tank 21, and a filtration tank water outlet 25 provided at the lower part of the other side wall of each filtration tank 21; a filter cartridge is provided inside each filter tank 21; a filter tank water inlet 24 of a first filter tank in the filter system is connected with a water outlet port of the water inlet pipe 11;

The water outlet system comprises a water outlet pipe 31 connected with the filter tank water outlet 25 of the last filter tank in the filter system; the water outlet port of the water outlet pipe 31 is connected with a turbid circulating water pool.

The multi-stage oil removal and filtration of the oily turbid circulating water added with the demulsifier are realized by combining the water inlet and dosing system with a filtering system formed by at least three filtering tanks 21, so that suspended particles and oil drops in the oily turbid circulating water are ensured to be removed, and the oil removal effect is good; the invention can rapidly and efficiently remove the greasy dirt from the turbid circulating water system through the structural design of the water inlet dosing system, the filtering system and the water outlet system, and has short treatment period and high efficiency compared with the methods of physical sedimentation, air flotation, chemical treatment, biological treatment and the like in the prior art; the whole device is easy to clean and maintain, and equipment downtime caused by blockage and abrasion is reduced; compared with the prior art, the invention greatly reduces the dependence on chemical treatment agents, thereby reducing the overall cost of the treatment process; and ensures that no secondary pollution is generated or secondary pollution is reduced as much as possible in the treatment process, and meets the requirements of environmental protection regulations and green sustainable development.

As a preferred embodiment of the present invention, the number of the filtration tanks 21 is three, and the three filtration tanks 21 are a pretreatment tank 211, a core degreasing tank 212 and a reinforcing degreasing tank 213 in this order according to the flow path of turbid circulating water; wherein,

The filter core of the pretreatment tank 211 includes a primary ceramic layer 2111 disposed below the filter tank water inlet 24 of the pretreatment tank 211 and a secondary ceramic layer 2112 disposed between the lower side of the primary ceramic layer 2111 and the inner bottom end of the pretreatment tank 211; wherein the primary ceramic layer 2111 is composed of ceramic material with particle size of 0.3-0.5 mm; the secondary ceramic layer 2112 is made of ceramic material with the grain size of 0.5-1 mm;

The filter core 2121 of the core oil removal tank is a selectively permeable membrane material; the filter core 2121 of the core tank is disposed between the lower side of the canister water inlet 24 of the core tank 212 and the inner bottom end of the core tank 212;

The filter element 2131 of the enhanced oil removal tank is disposed between the underside of the canister water inlet 24 and the underside of the canister water outlet 25 of the enhanced oil removal tank 213.

It should be noted that: the number of the filtration system including the filtration tanks 21 may be determined according to actual needs, and the present invention is not particularly limited thereto, and the preferred number of the filtration tanks 21 is three, namely, the pretreatment tank 211, the core tank 212 and the enhanced tank 213 in the embodiment of the present invention. Each filter tank 21 houses a filter element therein for capturing and removing oil droplets and other suspended particles from the water. The three filter tanks 21 have the same structure, but different filter cores are arranged inside, and the treatment degrees of the turbid circulating water by different filter cores can be different. Of course, the filter element in each filter tank 21 may be the same, and may be selected according to actual needs, and the present invention is not particularly limited.

The filter cores in the pretreatment tank 211, the core tank 212, and the enhanced tank 213 in this embodiment are described in detail as follows:

The pretreatment tank 211 can be used as security filtration, is the pretreatment of the core oil removal tank 212, and is mainly used for removing larger particle impurities and part of oil stains. Preferably, but not limited to, two-stage filler, and the first-stage ceramic layer 2111 is preferably, but not limited to, a ceramic material having a particle size of 0.3-0.5 mm; the layer thickness (layer height) is preferably, but not limited to, 600mm; the secondary ceramic layer 2112 is preferably, but not limited to, composed of ceramic material having a particle size of 0.5-1 mm; ; the layer thickness (layer height) is preferably, but not limited to, 100mm.

The core degreasing tank 212 mainly plays a core degreasing function, and is mainly used for efficiently separating oil and water and removing most of greasy dirt. The filter core can be a selective permeable membrane material, has extremely sensitive distinguishing capability for oil and water, has the characteristic of completely rejecting oil adhesion on the surface of the membrane material, has a special function barrier effect of 'oil passing but water passing', and is preferably but not limited to a ceramic permeable membrane material. When the membrane is immersed in water, the material is activated to form a function of blocking oil removal; when the oil-containing water is to permeate the membrane, water molecules on one side of the water can pass through the intercepting membrane under proper pressure, and the hydrophobic dispersoids such as oil are intercepted on the surface of the membrane by the intercepting membrane, so that the oil-water separation is successfully realized. The blocked oil particles cannot adhere to the interception film and can only stay on the outer surface of the film, and as the oil particles are continuously increased, the oil particles mutually collide and agglomerate to gradually form large oil particles, and the large oil particles float under the action of buoyancy, so that the aim of oil-water separation is truly realized.

The enhanced oil removal tank 213 serves as a post-treatment of the core oil removal tank 212, further enhancing the oil removal effect to ensure that the effluent quality meets the standard.

As a preferred embodiment of the present invention, the apparatus further comprises a backwash system; wherein the backwash system comprises backwash pipes 41 connected to the canister water outlets 25 of each canister 21 in the filtration system.

Specifically, the backwash tube 41 is used to introduce clean water for reverse cleaning to remove the accumulated material in the filter element.

As a preferred aspect of the present invention, adjacent filter tanks 21 in the filter system are connected by a communication water pipe 26; a communication valve 261 is provided on the communication water pipe 26; a backwash valve 411 is provided in the backwash pipe 41.

By arranging the communication valve 261, the filtration process of turbid circulating water and the smooth progress of back flushing operation are convenient to control, and when back flushing is required, the communication valve 261 and a valve on the water outlet pipe 31 are required to be closed, and the back flushing valve 411 is required to be opened.

As a preferable embodiment of the present invention, a back flushing main pipe 42 is connected to the water inlet end of the back flushing pipe 41, and a back flushing main pipe control valve 421 is provided to the water inlet end of the back flushing main pipe 42.

The back flush main pipe 42 is convenient for supplying the back flush main pipe 42 with a flushing water source, and the back flush main pipe control valve 421 is convenient for controlling the water supply condition of the back flush water source.

As a preferable aspect of the present invention, a turbid circulating water inlet valve 111 is provided at the inlet port of the inlet pipe 11; and/or, a dosing pump 121 is arranged on the dosing tube 12 close to the demulsifier drug storage tank 13; and/or, a dosing control valve 122 is provided on the dosing tube 12; and/or, a pump body 112 is arranged on the water outlet section of the water inlet pipe 11; and/or, a turbid circulating water outlet valve 113 is arranged on the water inlet pipe 11 near the water outlet port; and/or a temperature detection gauge 114 and a pressure gauge 115 are provided at the outlet port of the inlet pipe 11.

Wherein the dosing control valve 122 is preferably, but not limited to, a back pressure valve; controlling the dosing pressure to prevent the reflux of the liquid medicine; the demulsifier medicine storage box 13 is used for storing demulsifiers, and the demulsifiers are used for reducing the stability of the oil-water emulsified state, so that the aggregation and floating of oil drops are facilitated; the dosing pump 121 is used to ensure that the demulsifier can be added to the turbid circulating water uniformly and continuously; the dosing tube 12 is used to deliver the demulsifier to the mixing point (the water inlet section of the water inlet tube). The turbid circulating water inlet valve 111 and the turbid circulating water outlet valve 113 are preferably but not limited to electric valves, and the direction and the flow rate of water making flow are convenient to operate and manage; the water inlet pipe 11 is used for introducing oily wastewater to be treated into the filtering system; the pump body 112 is preferably, but not limited to, a screw pump for providing the necessary pressure to ensure water flow through the entire system; the temperature detection gauge 114 and the pressure gauge 115 are used for monitoring the temperature and pressure of water in the treatment process in real time, so as to ensure that the system operates in a safe and optimal working state.

As a preferred embodiment of the present invention, a first sampling tube 51 is provided on the water outlet section of the water inlet tube 11; the first sampling tube 51 is provided with a first sampling valve 511. The method is used for collecting turbid circulating water mixed with demulsifier and checking the stability of the turbid circulating water.

As a preferred scheme of the invention, a flowmeter 32 is arranged on the water outlet pipe 31 near the filter tank water outlet 24 of the last filter tank; and/or, a filtered water outlet valve 33 is arranged on the water outlet pipe 31 and close to the turbid circulating water pool; and/or a second sampling valve 34 is provided on the outlet pipe 31.

The water outlet pipe 31 is used for flowing the treated water out of the system from the pipeline, and if the treated water is qualified, the treated water is conveyed to the original turbid circulating water pool for recycling of the system. The flow meter 32 is used to monitor the flow of the outlet water to ensure that the system is within the design throughput. The second sampling valve 34 is used for periodically sampling and analyzing, and detecting the treatment effect. The filtered water outlet valve 33 is used for managing the water outlet process, and guaranteeing the continuity and safety of water flow.

As a preferred embodiment of the present invention, an observation window 231 and an oil collecting pipe control valve 232 are provided on the oil collecting pipe 23 of each canister 21; the oil stain outlet of the oil collecting pipeline 23 of each filtering tank 21 is connected with the same oil stain discharging pipe 6.

The tank top of each filter tank 21 is provided with an oil collector 22 and an oil collecting pipe 23 for effectively separating and collecting the floating oil droplets. The oil collecting pipeline 23 is provided with an observation window 231 and an oil collecting pipeline control valve 232, so that the oil flow and cleaning work can be conveniently observed and controlled.

The turbid circulating water filtering method provided by the invention adopts the turbid circulating water filtering device disclosed by the invention to carry out oil stain filtering treatment on oily turbid circulating water, and comprises the following steps:

S1, enabling turbid circulating water containing oil to be filtered to enter a water inlet pipe from a turbid circulating water tank;

s2, enabling the demulsifier in the demulsifier medicine storage box to enter a water inlet section of the water inlet pipe according to a preset metering, and mixing the demulsifier with turbid oily water in the water inlet section;

S3, enabling the turbid oily circulating water mixed with the demulsifier to enter a filtering system through a water inlet pipe;

S4, in the filtering system, oily turbid circulating water sequentially flows through each filtering tank and is filtered by a filtering core in each filtering tank, and greasy dirt collected from the oily turbid circulating water in each filtering tank is discharged through an oil collecting pipeline; and finally, the turbid circulating water which sequentially passes through each filtering tank to remove the greasy dirt flows back to the turbid circulating water tank from the water outlet port of the last filtering tank through the water outlet pipe.

The preset amount can be set according to actual needs, and the invention is not particularly limited.

The water source containing oil enters the filtering system through the water inlet pipe 11, the filter core of each filtering tank 21 of the filtering system is immersed in water and then activated to form a barrier, the oil removing function is achieved, water molecules enter the inner cavity through the filter core, and water molecules flow out through the water outlet pipe 31 and enter the production pipeline. The oil contained in the water source is intercepted outside by the filter element, thereby successfully realizing oil-water separation. Along with the continuous increase of the intercepted oil particles, the oil particles float under the action of buoyancy and finally are collected in the oil collector, so that the oil removal purpose is achieved.

Specifically, turbid oily water enters the filtering system through the water inlet pipe 11, and the screw pump provides power to enable the water flow to flow through the whole filtering system; at the dosing point (water inlet section of the water inlet pipe), the metering pump injects demulsifier into the water flow according to a proportion, so that the stability of the oil-water emulsified state is reduced; the water flow sequentially enters three filter tanks 21 for filtering:

pretreatment tank 211: removing larger particle impurities and part of greasy dirt;

core oil removal tank 212: the permselective membrane efficiently separates oil and water, and most of greasy dirt is removed;

and reinforcing the oil removal tank 213: further remove residual greasy dirt and ensure that the effluent quality reaches the standard.

The separated oil drops float to the top of each filter tank 21, are collected through an oil collector 22 and an oil collecting pipeline 23, and are concentrated; the backwashing system is started regularly, the filter cores of the three filter tanks 21 are backwashed, and the filtering performance is recovered; the treated water is discharged through the water outlet pipe 31, the water outlet flow is monitored by an electromagnetic flowmeter, and the water quality is detected by periodically sampling by a sampling valve, so that the oil content of the water outlet is ensured to be less than or equal to 2mg/l.

The main technical indexes in the turbid circulating water filtering method provided by the invention comprise:

Rated treated water amount: typically configured according to 10% of the amount of turbid circulating water.

Operating temperature: the temperature is less than or equal to 95 ℃.

System water inlet pressure: more than or equal to 0.35Mpa

Tank design pressure: and (5) configuring according to actual requirements.

The water quality condition of water inflow:

oil content: less than or equal to 1000mg/l

PH value: 6-10;

Device effluent quality: oil content: normal system operation 24 after hours less than or equal to 2mg/l

System self-consumption rate: 0.3%.

According to the turbid circulating water filtering device and method provided by the invention, the water inlet dosing system is combined with the filtering system formed by at least three filtering tanks, so that the oily turbid circulating water added with the demulsifier is subjected to multistage oil removal filtering, suspended particles and oil drops in the oily turbid circulating water are ensured to be removed, and the oil removal effect is good; the invention can rapidly and efficiently remove the greasy dirt from the turbid circulating water system through the structural design of the water inlet dosing system, the filtering system and the water outlet system, and has short treatment period and high efficiency compared with the methods of physical sedimentation, air flotation, chemical treatment, biological treatment and the like in the prior art; the whole device is easy to clean and maintain, and equipment downtime caused by blockage and abrasion is reduced; compared with the prior art, the invention greatly reduces the dependence on chemical treatment agents, thereby reducing the overall cost of the treatment process; and ensures that no secondary pollution is generated or secondary pollution is reduced as much as possible in the treatment process, and meets the requirements of environmental protection regulations and green sustainable development.

The turbid circulating water filtering apparatus and method according to the present invention are described above by way of example with reference to the accompanying drawings. It will be appreciated by those skilled in the art that various modifications may be made to the turbid circulating water filtration apparatus and method of the present invention as described above without departing from the teachings of the present invention. Accordingly, the scope of the invention should be determined from the following claims.

Claims (10)

1. The turbid circulating water filtering device is used for filtering and removing out-of-standard greasy dirt in a turbid circulating water system; the device is characterized by comprising a water inlet dosing system, a filtering system and a water outlet system; wherein,

The water inlet and dosing system comprises a water inlet pipe connected with the turbid circulating water pool, a dosing pipe connected with a water inlet section of the water inlet pipe and a demulsifier medicine storage box connected with a dosing end of the dosing pipe;

The filtering system comprises at least three filtering tanks connected in series, an oil collector arranged at the top end of each filtering tank, an oil collecting pipeline connected with the top end of the oil collector, a filtering tank water inlet arranged at the upper part of one side wall of each filtering tank and a filtering tank water outlet arranged at the lower part of the other side wall of each filtering tank; a filter element is arranged in each filter tank; a filter tank water inlet of a first filter tank in the filter system is connected with a water outlet port of the water inlet pipe;

The water outlet system comprises a water outlet pipe connected with a filter tank water outlet of a last filter tank in the filter system; and a water outlet port of the water outlet pipe is connected with the turbid circulating water pool.

2. The turbid circulating water filter apparatus according to claim 1, characterized in that,

The number of the filtering tanks is three, and the three filtering tanks are a pretreatment tank, a core oil removal tank and a reinforced oil removal tank in sequence according to the flowing route of turbid circulating water; wherein,

The filter core of the pretreatment tank comprises a primary ceramic material layer arranged below a water inlet of the filter tank of the pretreatment tank and a secondary ceramic material layer arranged between the lower part of the primary ceramic material layer and the inner bottom end of the pretreatment tank; wherein the primary ceramic material layer is composed of ceramic materials with the particle size of 0.3-0.5 mm; the secondary ceramic material layer is composed of ceramic materials with the particle size of 0.5-1 mm;

The filter element of the core oil removal tank is made of a selectively permeable membrane material; the filter core of the core oil removal tank is arranged between the lower part of the water inlet of the filter tank of the core oil removal tank and the inner bottom end of the core oil removal tank;

The filter element of the reinforced oil removal tank is arranged between the lower part of the water inlet of the filter tank of the reinforced oil removal tank and the upper part of the water outlet of the filter tank.

3. The turbid circulating water filter apparatus of claim 1, further comprising a backwash system; wherein the backwash system comprises backwash pipes connected to the canister outlets of each canister in the filtration system.

4. The turbid circulating water filter apparatus according to claim 3,

Adjacent filter tanks in the filter system are connected through a communication water pipe;

a communication valve is arranged on the communication water pipe;

And a back flush valve is arranged on the back flush pipe.

5. The turbid circulating water filter apparatus according to claim 4,

A back flushing main pipe is connected with the water inlet end of the back flushing pipe,

And a back flushing main pipe control valve is arranged at the water inlet end of the back flushing main pipe.

6. The turbid circulating water filter apparatus according to claim 1, characterized in that,

A turbid circulating water inlet valve is arranged at the water inlet port of the water inlet pipe; and/or the number of the groups of groups,

A dosing pump is arranged on the dosing pipe close to the demulsifier medicine storage box; and/or the number of the groups of groups,

A dosing control valve is arranged on the dosing pipe; and/or the number of the groups of groups,

A pump body is arranged on the water outlet section of the water inlet pipe; and/or the number of the groups of groups,

A turbid circulating water outlet valve is arranged on the water inlet pipe close to the water outlet port; and/or the number of the groups of groups,

And a temperature detection meter and a pressure meter are arranged at the water outlet of the water inlet pipe.

7. The turbid circulating water filter apparatus according to claim 1, characterized in that,

A first sampling tube is arranged on the water outlet section of the water inlet pipe;

A first sampling valve is arranged on the first sampling tube.

8. The turbid circulating water filter apparatus according to claim 1, characterized in that,

A flowmeter is arranged on the water outlet pipe and close to the water outlet of the filtering tank of the last filtering tank; and/or a filtered water outlet valve is arranged on the water outlet pipe close to the turbid circulating water tank; and/or the number of the groups of groups,

And a second sampling valve is arranged on the water outlet pipe.

9. The turbid circulating water filter apparatus according to claim 1, characterized in that,

An observation window and an oil collecting pipeline control valve are arranged on the oil collecting pipeline of each filtering tank;

The oil stain outlet of the oil collecting pipeline of each filtering tank is connected with the same oil stain discharging pipe.

10. A turbid circulating water filtering method, characterized in that the turbid circulating water filtering device according to any one of claims 1-9 is used for carrying out oil stain filtering treatment on oily turbid circulating water, and the method comprises the following steps:

s1, enabling turbid circulating water containing oil to be filtered to enter the water inlet pipe from a turbid circulating water tank;

s2, enabling the demulsifier in the demulsifier medicine storage box to enter a water inlet section of the water inlet pipe according to a preset amount, and mixing the demulsifier with turbid circulating water in the water inlet section;

s3, enabling the turbid oily circulating water mixed with the demulsifier to enter the filtering system through the water inlet pipe;

s4, in the filtering system, the oily turbid circulating water sequentially flows through each filtering tank and is filtered by a filtering core in each filtering tank, and greasy dirt collected by each filtering tank from the oily turbid circulating water is discharged through an oil collecting pipeline; and finally, the turbid circulating water which sequentially passes through each filtering tank to remove the greasy dirt flows back to the turbid circulating water tank from the water outlet port of the last filtering tank through the water outlet pipe.