JP2024020737A - Wastewater treatment equipment - Google Patents

Abstract

[Problem] Portable wastewater with high processing capacity that can treat wastewater containing organic solid particles such as grain dust, which have a specific gravity close to that of water and are easily sheared, and remove organic solid particles. Provide processing equipment. A portable wastewater treatment device 100 includes a hydrocyclone device 10 and a sedimentation separation device 20 that sediments and separates organic solid particles in a turbid liquid discharged from the liquid cyclone device. The device 10 includes a hydrocyclone 11 and a pressurizing pump 16 for injecting wastewater into the hydrocyclone 11. The hydrocyclone 11 has a main body consisting of a cylindrical portion and a conical portion whose diameter gradually decreases from below the cylindrical portion. , a wastewater introduction pipe 12 , a turbid liquid discharge pipe 14 , and a clean liquid discharge pipe 13 . turbid liquid tank 22 and a cleaning liquid area 23 disposed above. [Selection diagram] Figure 1

Description

The present invention relates to a wastewater treatment device that removes organic solid particles such as grain dust from wastewater discharged from a wet dust collector or the like.

Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2010-069364) discloses a solid-liquid separator that can improve separation performance by preventing impurities separated from raw water from being remixed into treated water.

The solid-liquid separator described in Patent Document 1 is a solid-liquid separator that separates supplied raw water into impurities and treated water, and when raw water containing impurities to be recovered flows in, this raw water is internally swirled. a hydrocyclone that precipitates impurities contained in raw water; an inlet pipe that is connected above the hydrocyclone so that the supplied raw water swirls inside the hydrocyclone; and an inlet pipe that supplies raw water to the hydrocyclone; A connection part connected to the lower part and having a discharge port for discharging settled impurities from the liquid cyclone; an impurity recovery part connected to the liquid cyclone via the connection part and collecting impurities discharged from the liquid cyclone; and a discharge port. An obstacle installed nearby to prevent impurities collected in the impurity recovery section from entering the liquid cyclone again, and an obstacle connected to the top of the liquid cyclone to prevent the flow of treated water from the liquid cyclone after impurities have been separated from the raw water. and an outflow pipe for discharging.

Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2002-126788) discloses that a hydrocyclone is provided in the front stage of a filtration device to reduce the solid load, and a filtration device using a fiber filter medium is used to handle raw water with high turbidity during rainy days. A device has been disclosed that can cope with this problem.

The suspension treatment device described in Patent Document 2 connects a pressure pump installed in a water intake tank to a hydrocyclone, swirls and separates suspended particles in raw water with this hydrocyclone, and collects separated water extracted from the hydrocyclone. After adding a flocculant to flocculate the remaining fine particles, the flocs were fed to a filtration device using fiber filter media, and the flocs were captured by the fiber filter media that formed the filter media layer, and solid-liquid separation was performed. Take out the treated water.

Patent Document 3 (Japanese Unexamined Patent Publication No. 2017-060922) discloses a solid-liquid separation device that can easily recover solids from a separated liquid recovered from a hydrocyclone without adding a dedicated dehydration device. There is.

The solid-liquid separator described in Patent Document 3 is a solid-liquid separator that separates solids from a suspension containing solids, and separates a separated liquid with a high solids concentration and solids from the suspension by centrifugation. A liquid cyclone that separates the liquid into low-concentration waste liquid, a pump that supplies the suspension to the liquid cyclone, a collection container that is supplied with the separated liquid discharged from the liquid cyclone, and a supply of compressed air to the collection container. It is equipped with a compressed air supply means and a water-permeable member provided at the bottom of the collection container, and when the separated liquid is collected in the collection container, water is forced from the separated liquid through the water-permeable member by supplying compressed air. The solid matter in the separated liquid is recovered as a dehydrated cake.

Patent Document 4 (Japanese Unexamined Patent Publication No. 09-150012) discloses that carryover (suspended particles contained in raw water are not captured by an inclined pipe and is entrained with the flow) without interfering with the original sedimentation and separation work. In order to effectively suppress this phenomenon (in which the liquid rises due to the flow of liquid), a sedimentation separator is described that has a sedimentation tank in which a baffle plate is installed under appropriate conditions adapted to the flow conditions of the liquid in the sedimentation tank.

The sedimentation separation device described in Patent Document 4 sediments and separates suspended particles from a liquid to be treated containing suspended particles flowing through an inclined plate or an inclined pipe installed in a settling tank by utilizing the difference in specific gravity between the two. In a sedimentation separator, the conditions under which carryover can be suppressed are determined from the relationship between the critical flow velocity, which is the maximum flow velocity in the sedimentation tank immediately before carryover occurs, at a given liquid flow rate and a given liquid temperature. It has a settling tank in which a baffle plate is installed above the inclined plate or the inclined pipe.

Patent Document 5 (Japanese Unexamined Patent Publication No. 2014-002050) discloses an aggregation state detection device that can quickly and accurately detect the aggregation state of treated water during a water purification process.

The flocculation state detection device of Patent Document 5 includes a flocculation-sedimentation separation means for classifying flocs in flocculation-sedimentation treated water to which a flocculant containing aluminum has been added, according to the particle size of the flocs, and a classification treatment obtained by the flocculation-sedimentation separation means. An addition means for adding a reagent for aluminum measurement and a buffer solution to water, a mixing means for mixing the classified water, a reagent for aluminum measurement, and a buffer solution, and an absorbance meter for measuring the absorbance of the reaction solution mixed by the mixing means. and a conversion means for converting the absorbance of the reaction solution measured by an absorbance meter into an aluminum concentration in the reaction solution, and the coagulation-sedimentation separation means has an inlet for the coagulation-sedimentation treated water in the lower part and a classification treatment in the upper part. This is an inclined pipe in which a cylindrical pipe provided with a water outlet is installed at an angle with respect to the direction of gravity.

Non-Patent Document 1 (Research on Separation Diameter Control of Hydrocyclones) describes particle size and partial separation efficiency (with blowdown ratio (B.D.) as a parameter in standard type hydrocyclone 21 and experimental hydrocyclone). A graph of the relationship between the ratio of particles output from the outlet on the blowdown side to the particles input to the hydrocyclone is described.

According to Non-Patent Document 1, in the case of a standard hydrocyclone, at a blowdown ratio of 10% to 30%, most particles with a particle size of at least 20 μm or more are output from the outlet on the blowdown side. Note that the conditions in this case are an input flow rate of 380 l/h, an inlet pipe Φ6 mm, and a blow-up pipe Φ8 mm.

Japanese Patent Application Publication No. 2010-069364 Japanese Patent Application Publication No. 2002-126788 JP2017-060922A Japanese Patent Application Publication No. 09-150012 Japanese Patent Application Publication No. 2014-002050

Yuji Isshiki et al., “Research on Separation Diameter Control of Hydrocyclones,” Journal of the Society of Powder Technology, No. 34 (published in 1997), P. 690-696

In the past, wastewater discharged from wet dust collectors was generally discharged directly into natural rivers, etc., but in recent years, attempts have been made to purify the wastewater from wet dust collectors from the perspective of water quality management. has been done. As wastewater treatment devices for wet dust collectors, those that use a filtration filter and those that perform chemical treatment using chemicals are generally known.
However, as the operating time of the filter increases, the filter becomes more clogged and the processing capacity decreases, and the filter has to be replaced frequently, requiring the apparatus to be stopped, and the replacement cost increases. In addition, chemical treatment with chemicals requires the use of large amounts of chemicals and is costly, and some chemicals require neutralization, which poses the problem that water cannot be directly released into natural rivers or the like.
On the other hand, in large-scale sewage treatment facilities, it is known to treat wastewater by installing inclined pipes in sedimentation soda. However, the sites where wet dust collectors are used are usually near fields and are not installed adjacent to large-scale sewage treatment plants.

A method of separating liquid and solid using a hydrocyclone is known. As shown in prior art documents, a liquid cyclone is a device in which solid particles are deposited on the peripheral wall of the cyclone and settled by the centrifugal force of the rotating liquid input into the cyclone, and have a simple structure, a large throughput, and a small installation area. It has many advantages such as being small and requiring no power other than the pump.
However, in the case of the treatment of wastewater containing organic solid particles such as grain dust discharged from a wet dust collector, which is the main application of the present invention, the specific gravity of the organic solid particles is 1.2 or more and 1.7 or less. When water that has a specific gravity close to that of water and contains organic solid particles is input into a liquid cyclone, the organic solid particles cannot be completely separated to the turbid liquid discharge pipe side as described in the above-mentioned Non-Patent Document 1.
In addition, wastewater containing organic solid particles contains many organic solid particles such as grain dust that are easily sheared into small pieces by centrifugal force, and depending on conditions such as centrifugal force, they are sheared and the particle size becomes even smaller, making it difficult to remove. There are challenges that will become difficult.

On the other hand, a tilted tube uses the settling of solid particles in a liquid due to gravity, and deposits the settled solid particles on the wall of the tilted tube. The solid particles accumulated on the pipe wall are discharged downward by increasing the angle of
Although organic solid particles are not finely sheared when solid particles are removed using an inclined tube, since the particle size of the settling particles is proportional to the square root of the liquid flow rate, particles of the required particle size and with a specific gravity close to that of water can be obtained. The problem is that the flow rate is limited in order to sediment, making it difficult to increase the throughput.

The solid-liquid separator of the invention described in Patent Document 1 has one of the problems when the swirling flow is made high-speed in order to obtain a strong centrifugal force. This solid-liquid separator is equipped with an obstacle that prevents the collected impurities from flowing back into the hydrocyclone.
However, in the solid-liquid separator described in Patent Document 1, organic solid particles such as grain dust that are easily sheared by strong centrifugal force and collision with obstacles may be sheared into small pieces.

The suspension processing device described in Patent Document 2 is described as installing a hydrocyclone upstream of the filtration device to separate approximately 50 to 60% of suspended particles of 5 microns or more. On the other hand, it has a separation capacity equal to or higher than that of the standard hydrocyclone (described later) of Non-Patent Document 1, and it seems that strong centrifugal force is at work.
Further, the treatment device described in Patent Document 2 further filters the discharged water from the cleaning liquid discharge pipe side of the liquid cyclone, and cannot remove organic solid particles in the discharged water.

In the solid-liquid separator described in Patent Document 3, a liquid with a high concentration of solids separated by centrifugation using a liquid cyclone is supplied to a collection container provided with a water-permeable member at the bottom, and the separated liquid is separated by centrifugation using a liquid cyclone. Water is forcibly removed from the separated liquid, and solids in the separated liquid are recovered as a dehydrated cake.
The solid-liquid separator described in Patent Document 3 is a solid-liquid separator for a turbid liquid mainly containing solids such as diatomaceous earth. Since diatomaceous earth has a high specific gravity of about 2.1, it can be separated relatively easily with a hydrocyclone, but organic solid particles such as grain dust, which is the object of the present invention, may not be separated sufficiently.
In addition, in the solid-liquid separation device described in Patent Document 3, it is necessary to alternately perform the step of separating a separated liquid with a high solids concentration using a liquid cyclone and the step of recovering the solids as a dehydrated cake from within the collection container. Therefore, when used as a wastewater treatment device, there is also the problem that continuous operation of wastewater treatment is not possible.

In the sedimentation separator described in Patent Document 4, raw water flows obliquely upward through each tubular passage of the sedimentation separator, and during this time flocs combined with suspended particles settle, and the above-mentioned inclination angle α Because the angle is larger than the angle of repose, the precipitated material slides down the bottom of the tube in the opposite direction to the liquid flow, is discharged at the inlet end of the tilted tube sedimentation separator, and is accumulated at the bottom of the sludge collection tank. , the accumulated precipitated substances are removed periodically or continuously. The problem that Patent Document 3 attempts to solve is carryover, where suspended particles are not captured by the inclined pipe and rise with the flow. In order to suppress the phenomenon, in Patent Document 3, a baffle plate is installed at the upper part of the inclined pipe. This carryover is a phenomenon that occurs when there is a large difference in the temperature of the water in the sedimentation tank and the temperature of the water flowing into the sedimentation tank, and is a problem when the capacity of the sedimentation tank (turbid liquid tank) is small. It won't be. Furthermore, in a sedimentation separator using an inclined tube, strong forces such as centrifugal force are not applied, so solid particles are not sheared into small pieces.
However, in sedimentation separation equipment using inclined tubes, the particle size of the particles that can be settled is proportional to the square root of the liquid flow rate, so the flow rate for settling particles of the required size is limited, and the throughput is limited. The problem is that it is difficult to increase

上記式によって、傾斜管の形状が一定の場合に、粒径ｄの２乗と粒子の密度と液体の密度との差との積が流量Ｍと比例関係にあることが分かる。したがって傾斜管のみで排水中のスラッジを除去する場合、各傾斜管の流量が限定されるため、排水処理装置の処理量を増やすためには傾斜管の数を増やすことが必要になり、その結果排水処理装置の容積および重量が増加する。したがって、容積および重量が限定される可搬型の排水処理装置においては、傾斜管のみで排水処理装置を構成することは困難である。 The agglomeration state detection device of Patent Document 5 also includes a cylindrical tube provided with an inlet for coagulation-sedimentation treated water at the bottom and an outlet for classified treatment water at the top, tilted with respect to the direction of gravity. Installed inclined pipes are used. Patent Document 5 further states: D: inner diameter of the inclined pipe, L: length of the inclined pipe, θ: angle of the inclined pipe with respect to the horizontal plane, M: flow rate (flow rate of coagulation and sedimentation treated water supplied to the inclined pipe), d : Particle size of floc, ρs: Density of floc, ρ: Density of liquid, it is stated that the length L of the inclined pipe for settling particles with particle size d is calculated by the following formula. .

From the above equation, it can be seen that when the shape of the inclined pipe is constant, the product of the square of the particle diameter d and the difference between the particle density and the liquid density is proportional to the flow rate M. Therefore, when removing sludge from wastewater using only inclined pipes, the flow rate of each inclined pipe is limited, so in order to increase the throughput of the wastewater treatment equipment, it is necessary to increase the number of inclined pipes. The volume and weight of wastewater treatment equipment increases. Therefore, in a portable wastewater treatment device whose volume and weight are limited, it is difficult to configure the wastewater treatment device only with inclined pipes.

The main purpose of the present invention is to treat wastewater that contains organic solid particles, such as grain dust discharged from wet dust collectors, whose specific gravity is close to that of water and which is easily sheared. An object of the present invention is to provide a portable wastewater treatment device that can remove wastewater and has a high treatment capacity.
Another object of the present invention is to purify the airflow by passing an airflow containing organic solid particles such as grain dust through a water film formed in the device, thereby collecting and collecting the organic solid particles in the water. To provide a wet type dust collector which is capable of recycling washing water and can be operated continuously by combining a wastewater treatment device with a dust collector equipped with a dust removal chamber that exhausts the air as air.

(1)
A wastewater treatment device according to one aspect is a portable wastewater treatment device that includes a hydrocyclone device that separates wastewater containing organic solid particles into a turbid liquid and a clean liquid; The liquid cyclone device includes a sedimentation separation device that sediments and separates organic solid particles, and the liquid cyclone device includes a liquid cyclone and a pressure pump that injects wastewater into the liquid cyclone. A cleaning device consisting of a main body consisting of a conical part whose diameter gradually decreases from below, a drainage inlet pipe connected to the cylindrical part, a turbid liquid discharge pipe opening at the bottom of the conical part, and an opening at the center of the top surface of the cylindrical part. The sedimentation separator includes a liquid discharge pipe and a pressure measuring device that measures the pressure of the waste water introduced into the waste water introduction pipe, and the sedimentation separation device includes a plurality of inclined pipes, a turbid liquid discharge pipe arranged at the bottom of the inclined pipe, and a turbid liquid discharge pipe. and a cleaning liquid area located at the top of the inclined tube.

Conventionally, wastewater containing solid particles has been treated using a liquid cyclone, a filter, a chemical treatment using chemicals, a sedimentation separator using an inclined pipe, etc.
Among these, the hydrocyclone rotates the input liquid and uses the centrifugal force of the rotating liquid to deposit solid particles in the liquid on the peripheral wall of the liquid cyclone, causing them to settle. It has many advantages, including a small footprint and no power required other than the pump.
However, when treating wastewater containing organic solid particles, such as grain dust, whose specific gravity is close to that of water, it is difficult to separate sufficient organic solid particles using a hydrocyclone, and they are easily sheared into small pieces by centrifugal force. Since a large amount of organic solid particles are contained in wastewater, there is a problem that the organic solid particles are sheared and the particle size becomes small, making it impossible to separate the organic solid particles.
On the other hand, a sedimentation separator using an inclined tube uses gravity to cause solid particles in the liquid to settle on the wall of the inclined tube, and discharges the solid particles that have settled on the tube wall downward along the tube wall. Since no force is applied, the organic solid particles are not sheared.
However, in a sedimentation separator using an inclined tube, the product of the particle size of the settling particles and the difference between the specific gravity of the particles and the specific gravity of the liquid is proportional to the square root of the flow rate of the liquid. The problem is that the flow rate for settling particles whose specific gravity is close to that of water is limited, making it difficult to increase the throughput. Therefore, inclined pipes for purifying wastewater have the problem of increasing the size of the device, and although they are used in large-scale water purification facilities, they are not normally used in small and portable wastewater treatment devices.
In a wastewater treatment device according to one aspect, a liquid cyclone device and a sedimentation separator are combined, and the solid particles in the turbid liquid that is concentrated and discharged by the liquid cyclone device are separated by sedimentation. The volume of the included inclined pipes can be reduced to prevent shearing of organic solid particles, and a portable wastewater treatment device with high wastewater treatment efficiency has been realized.
Moreover, since it is small, it can be attached to a wet type dust collector as equipment. Furthermore, since it is portable, it can be easily added to an existing wet dust collector, and can be replaced as necessary.

In this case, the turbid liquid discharged from the turbid liquid discharge pipe of the hydrocyclone rises inside the inclined pipe via the turbid liquid tank placed at the bottom of the inclined pipe, and in this process, solid particles in the turbid liquid settle. It is deposited on the wall of the inclined pipe, and further slides down the pipe wall and deposited on the bottom of the turbid liquid tank.
On the other hand, the wastewater with settled solid particles flows into the cleaning liquid area, is discharged continuously or intermittently by a pump, and is discharged from the wastewater treatment equipment together with the wastewater discharged from the cleaning liquid discharge pipe of the hydrocyclone. .
Furthermore, when operating a hydrocyclone, it is important to control the flow rate or flow rate introduced from the waste water introduction pipe. For this reason, the wastewater introduction pipe of the hydrocyclone is equipped with a pressure measuring device that measures the pressure of the wastewater.

(2)
A wastewater treatment device according to a second aspect of the present invention is a wastewater treatment device according to one aspect, in which the liquid cyclone concentrates organic solid particles having a specific gravity of 1.2 or more and 1.7 or less and discharges it as a turbid liquid, and It is configured to suppress shearing of organic solid particles, and the ratio of the flow rate of the turbid liquid discharge pipe to the flow rate of the wastewater inlet pipe is set so that the turbid liquid discharge is within a range that allows the flow rate of the turbid liquid introduced into the sedimentation separation device. The amount of organic solid particles discharged from the tube may be set to be maximum.

In a liquid cyclone device, when the centrifugal force of the liquid rotating in the cyclone is increased, more solid particles in the liquid are deposited and settled on the peripheral wall of the cyclone, and are discharged from the turbid liquid discharge pipe. The concentration of organic solid particles increases.
However, in the case of treating wastewater such as grain dust, which is the object of the present invention, the specific gravity of organic solid particles contained in the wastewater is 1.2 or more and 1.7 or less. This value is smaller than, for example, the specific gravity of diatomaceous earth, sand particles, etc., which is 2.0 to 2.1, and the organic solid particles cannot be completely separated to the turbid liquid discharge pipe side. On the other hand, if too much centrifugal force is applied to organic solid particles, they will be sheared and their respective particle sizes will become smaller, making it impossible to separate them.
In the wastewater treatment device according to the second invention, in order to maximize the concentration of organic solid particles discharged from the turbid liquid discharge port within a range where shearing of the organic solid particles can be suppressed, Parameters related to centrifugal force, such as the flow rate of the liquid introduced from the inlet pipe, are adjusted, and the ratio of the inner diameter of the clean liquid discharge pipe to the inner diameter of the turbid liquid discharge pipe is adjusted, and the ratio of the turbid liquid to the flow rate of the drainage inlet pipe is adjusted. The ratio of the flow rates of the discharge pipes is set such that the amount of organic solid particles discharged from the turbid liquid discharge pipe is maximized within a range that allows the flow rate of the turbid liquid introduced into the sedimentation separator.

(3)
A wastewater treatment device according to a third aspect of the present invention is one aspect of the wastewater treatment device or the wastewater treatment device according to the second invention, wherein the liquid cyclone is capable of concentrating organic solid particles having a specific gravity of 1.2 or more and 1.7 or less; The flow rate of the liquid introduced into the introduction pipe may be 2 m/sec or more and 10 m/sec or less, the inner diameter of the drainage introduction pipe may be 11 mm or more and 18 mm or less, and the inner diameter of the cylindrical portion may be 70 mm or more and 103 mm or less.

As a result, even when brittle organic solid particles such as rice husks whose specific gravity is close to that of water are introduced, it is possible to provide a wastewater treatment apparatus that reliably separates and is resistant to shearing. Therefore, it is possible to provide a wastewater treatment device that is more efficient and has a higher treatment capacity.

(4)
A wastewater treatment device according to a third aspect of the present invention is a wastewater treatment device according to any one of the third aspects of the invention, wherein the ratio of the flow rate of the turbid liquid discharge pipe to the flow rate of the wastewater introduction pipe is 0.3 or more, and 0.3 or more. It may be 5 or less.

すなわち、傾斜管において、所定の粒径ｄの有機固体粒子を沈降させるためには、傾斜管への入力流量を上記数式１で決定されるＭより多くすることはできない。したがって、沈降分離装置に導入される排水の量が多くなると、傾斜管の数を増加させることが必要になる。
このため、第４の発明にかかる排水処理装置の液体サイクロンでは、排水導入管の流量に対する混濁液排出管の流量の比を０．３以上、０．５以下に設定している。 When introducing organic solid particles, which have a specific gravity close to that of water and are easily sheared, into a liquid cyclone, it is not possible to discharge all of the organic solid particles to the turbid liquid discharge pipe side. However, by increasing the ratio of the flow rate of the turbid liquid discharge pipe to the flow rate of the waste water introduction pipe, it is possible to increase the amount of the organic solid particles discharged from the turbid liquid discharge pipe. On the other hand, when the ratio of the flow rate of the turbid liquid discharge pipe is increased, the flow rate of the turbid liquid introduced into the sedimentation separation device increases.
In the inclined pipe, the length of the inclined pipe is L, the input flow rate to the inclined pipe is M, the viscosity of the wastewater is μ, the gravitational acceleration is g, the density of flocs is ρs, the density of the wastewater is ρ, the minimum that can settle. When the particle size of the organic solid particles is d, the angle of the inclined tube with respect to the horizontal plane is θ, and the inner diameter of the inclined tube is D, the following formula 1 holds true (see paragraph [0035] of the specification of Patent Document 5).

That is, in order to precipitate organic solid particles having a predetermined particle size d in the inclined tube, the input flow rate to the inclined tube cannot be greater than M determined by the above equation 1. Therefore, as the amount of waste water introduced into the sedimentation separator increases, it becomes necessary to increase the number of inclined pipes.
Therefore, in the liquid cyclone of the wastewater treatment apparatus according to the fourth invention, the ratio of the flow rate of the turbid liquid discharge pipe to the flow rate of the wastewater introduction pipe is set to 0.3 or more and 0.5 or less.

(5)
A wastewater treatment device according to a fifth aspect of the present invention is a wastewater treatment device according to any one of the first aspect to the fourth aspect of the invention, further comprising a chain conveyor inside the turbid liquid tank, and the chain conveyor removes organic matter that has settled and accumulated from the inclined pipe. Solid particles may be discharged.

In this case, the organic solid particles that have slipped down the pipe wall are deposited on the bottom of the water tank, and the chain conveyor is operated intermittently to scrape out the organic solid particles that have accumulated on the bottom of the tank, allowing continuous operation of the wastewater treatment equipment. It becomes possible.

(6)
In the wastewater treatment apparatus according to the sixth invention, in the wastewater treatment apparatus according to the fifth invention, the chain conveyor may be operated intermittently during the wastewater treatment.

When the chain conveyor is operated continuously, turbulent flow occurs in the turbid liquid tank, and organic solid particles are rolled up into the turbid liquid tank.
In the wastewater treatment apparatus according to the sixth aspect of the invention, the chain conveyor is operated intermittently, thereby minimizing the winding up of organic solid particles due to the operation of the chain conveyor.
Furthermore, the intermittent operation of the chain conveyor has the effect of preventing the organic solid particles deposited on the walls of the inclined pipes from falling due to changes in the water flow in the turbid liquid tank, thereby preventing clogging of the inclined pipes.

(7)
A wastewater treatment device according to a seventh aspect of the present invention is a wastewater treatment device according to any one of the sixth aspect of the present invention, wherein the liquid cyclone device is configured by connecting a plurality of liquid cyclones in parallel, and each of the plurality of liquid cyclones is It may be possible to individually adjust the amount of wastewater flowing into the wastewater introduction pipe.

In a hydrocyclone device, the centrifugal force changes depending on the flow rate, which greatly affects characteristics such as the presence or absence of shearing of organic solid particles contained in the wastewater, so it is difficult to change the flow rate of the wastewater introduced into a single hydrocyclone. be.
Therefore, in the wastewater treatment apparatus according to the seventh aspect of the invention, the liquid cyclone apparatus is equipped with a plurality of liquid cyclones, and the processing capacity of the wastewater treatment apparatus is adjusted by the number of operating cyclones.
Furthermore, since characteristics such as the removal rate of organic solid particles change due to slight differences in the shape of the hydrocyclone, it is desirable to be able to individually adjust the flow rate in order to optimize the characteristics.

(8)
A wastewater treatment device according to an eighth aspect of the present invention is one aspect of the wastewater treatment device according to the seventh aspect of the invention, wherein the wastewater treatment device may treat wastewater containing organic solid particles discharged from a wet dust collector. .

Wet-type dust collectors are used in grain drying and preparation facilities, etc., by passing airflow containing organic solid particles such as grain dust through a water film formed inside the device, and collecting the organic solid particles in water. This device exhausts the airflow as clean air. For this reason, wet dust collectors generate wastewater containing a large amount of organic solid particles such as grain dust. When this wastewater is introduced into a conventional wastewater treatment equipment using a hydrocyclone, organic solid particles cannot be sufficiently separated, and organic solid particles such as grain dust are sheared into fine particles. Removal becomes difficult.
In the wastewater treatment device according to the eighth invention, the liquid cyclone device is configured to concentrate organic solid particles in the wastewater and discharge it as a turbid liquid, and to suppress shearing of the organic solid particles. By preventing organic solid particles such as dust from being sheared into fine particles, and by concentrating organic solid particles in wastewater and discharging them as a turbid liquid, the efficiency of the sedimentation separator into which the turbid liquid is introduced is improved. It is suitable as a wastewater treatment device for a wet type dust collector.

(9)
A wet dust collection device according to another aspect collects organic solid particles in water by passing an airflow containing organic solid particles such as grain dust through a water film formed in the device, and collects the organic solid particles in the airflow. A wastewater treatment device according to a seventh aspect of the present invention, which includes a dust removal chamber, a water tank for recovering water that has collected organic solid particles, and one aspect of removing organic solid particles from wastewater. The waste water from the water tank is introduced into the waste water treatment device, and the waste water from the clean liquid discharge pipe of the hydrocyclone and the clean liquid area is returned to the water tank.

In conventional wet dust collectors, organic solid particles such as grain dust are settled in a water tank that stores water that has collected organic solid particles, and the settled and accumulated organic solid particles are discharged. In this case, there was a problem in that it was difficult to recycle the washing water because the sedimentation rate of organic solid particles in the wastewater was slow.
On the other hand, installing an inclined pipe in a water tank can improve the sedimentation rate of organic solid particles, but the ability to remove organic solid particles from wastewater is still not sufficient.
A wet dust collector according to another aspect removes organic solid particles in the waste water by first introducing the waste water in the water tank into a hydrocyclone to increase the concentration of organic solid particles in the waste water and then passing it through an inclined pipe. This improves the efficiency of the system.
In this case, by returning the waste water from the cleaning liquid discharge pipe of the liquid cyclone and the cleaning liquid area to the water tank, it becomes possible to recycle the cleaning water in the wet dust collector.
Furthermore, the concentration and particle size of organic solid particles in the wastewater may vary greatly depending on the type of grain fed into the wet dust collector. Even in such a case, by circulating the wash water between the water tank and the wastewater treatment device, the cleanliness of the clean water can be kept uniform and low.
Further, even if the waste water from the cleaning liquid discharge pipe of the liquid cyclone and the cleaning liquid area is directly disposed of in the sewer or the like without recycling the washing water, the concentration of organic solid particles in the waste water can be reduced.

It is a schematic diagram showing an example of the wastewater treatment device of a 1st embodiment. It is a typical side view of a liquid cyclone. FIG. 3 is a schematic cross-sectional view of a tube of an inclined tube. It is a graph showing the relationship between the UF flow rate ratio, the particle concentration on the UF side, and the number of particles. FIG. 2 is a schematic diagram showing an example of a configuration during circulation operation in which a wastewater treatment device and a water tank are combined. It is a graph showing a time change in the concentration of organic solid particles in a water tank during a circulation operation in which a wastewater treatment device and a water tank are combined. It is a table showing the relationship between the flow rate of the stock solution, the shape of the liquid cyclone, the UF flow rate ratio, the UF concentration ratio, and the UF discharge ratio in Examples and Comparative Examples. It is a graph showing the relationship between the UF flow rate ratio, the UF concentration magnification, and the UF discharge ratio. It is a graph showing the relationship between Du/Do ratio and UF flow rate ratio. It is a schematic diagram which shows an example of the wet-type dust collector provided with the wastewater treatment apparatus of 2nd Embodiment.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts are given the same reference numerals. Their names and functions are also the same. Therefore, detailed descriptions thereof will not be repeated. The present invention will be explained in detail below.

[Wastewater treatment device 100 of the first embodiment]
FIG. 1 is a schematic diagram showing the configuration of a wastewater treatment apparatus 100 according to the first embodiment, FIG. 2 is a schematic cross-sectional view of the hydrocyclone 11, and FIG. 3 is a schematic cross-sectional view of the inclined pipe 21.
In FIG. 1, a wastewater treatment device 100 includes a hydrocyclone device 10 and a sedimentation separation device 20. The wastewater treatment device 100 of the first embodiment is configured to concentrate organic solid particles in wastewater using a liquid cyclone device 10, and to sediment and separate the concentrated organic solid particles in the wastewater using a sedimentation separator 20.
Further, since the wastewater treatment device 100 is a portable type and is not a large-scale facility like a treatment device in a water treatment plant, for example, the volume of the sedimentation separation device 20, which occupies a large part of the volume of the wastewater treatment device 100, is compressed. It is configured as follows.

(Liquid cyclone device 10)
The hydrocyclone device 10 includes a plurality of hydrocyclones 11 connected in parallel and a pressurizing pump 16 that pressurizes and introduces wastewater into each hydrocyclone 11. The reason why the pressurizing pump 16 is connected to each hydrocyclone 11 is to adjust the inflow amount of each hydrocyclone 11 individually.
As shown in FIG. 2, the liquid cyclone 11 includes a main body consisting of a cylindrical part 17 and a conical part 18 whose diameter gradually decreases from below the cylindrical part 17 at an opening angle θ1, and a wastewater introduction pipe 12 connected to the cylindrical part 17. A turbid liquid discharge pipe 14 having an opening at the bottom of a cone, a cleaning liquid discharge pipe 13 having an opening at the center of the upper surface of the cylindrical portion 17, and a pressure measuring device 15 for measuring the pressure of the waste water introduced into the waste water introduction pipe 12. and has. The pressure measuring device 15 is used as a monitor of the inflow amount of each hydrocyclone 11.
The waste water containing organic solid particles is pressurized by a pressurizing pump 16 and introduced into the liquid cyclone 11, rotates inside the liquid cyclone 11, and the centrifugal force of the rotating liquid causes the solid particles in the liquid to be transferred to the peripheral wall of the liquid cyclone 11. deposit and settle. The wastewater containing many settled solid particles is discharged from the turbid liquid discharge pipe 14, and the wastewater containing few solid particles is discharged from the clean liquid discharge pipe 13.

The liquid cyclone 11 rotates the input liquid, and uses the centrifugal force of the rotating liquid to deposit solid particles in the liquid on the peripheral wall of the liquid cyclone 11, causing them to settle.It has a simple structure, can handle a large amount of liquid, and It has many advantages, including a small footprint and no power required other than the pump.
However, when treating wastewater containing organic solid particles, such as grain dust, whose specific gravity is close to that of water, it is difficult to separate the organic solid particles sufficiently using the hydrocyclone 11, and the organic solid particles are finely sheared by centrifugal force. Since many organic solid particles are contained in wastewater, the organic solid particles are sheared and the particle size becomes small, making it impossible to separate the organic solid particles.
The purpose of the present invention is to remove organic solid particles such as grain dust discharged from the wet dust collector 200, etc., and since these organic solid particles have a specific gravity of 1.2 or more and 1.7 or less, which is close to that of water, Separation of complete organic solid particles is difficult. Furthermore, if the liquid cyclone 11 attempts to completely separate the organic solid particles, there is a possibility that the organic solid particles will be sheared.

As the flow rate of the wastewater introduced into the hydrocyclone 11 increases, the organic solid particles are more likely to be sheared, and as the centrifugal force applied to the liquid in the hydrocyclone 11 increases, the effect becomes greater.
The upper limit of the flow rate of the stock solution (drainage water) introduced into the liquid cyclone 11 is preferably 10 m/sec or less, more preferably 8 m/sec or less, and even more preferably 6 m/sec or less. Moreover, the lower limit is preferably 2 m/sec or more, more preferably 3 m/sec or more, and even more preferably 4 m/sec or more.
Further, the inner diameter (maximum value of the inner diameter) of the cylindrical portion 17 of the liquid cyclone 11 is preferably 36 mm or more and 296 mm or less, more preferably 50 mm or more and 191 mm or less, and even more preferably 70 mm or more and 103 mm or less.
This makes it possible to effectively separate organic solid particles having a specific gravity close to that of water while preventing brittle organic solid particles from being sheared.

On the other hand, when introducing organic solid particles that have a specific gravity close to that of water and are easily sheared into the liquid cyclone 11, it is also important to adjust the ratio of the flow rate of the turbid liquid discharge pipe 14 to the flow rate of the waste water introduction pipe 12. When introducing organic solid particles, which have a specific gravity close to that of water and are easily sheared, into the liquid cyclone 11, all of the organic solid particles cannot be discharged to the turbid liquid discharge pipe 14 side. However, by increasing the ratio of the flow rate of the turbid liquid discharge pipe 14 to the flow rate of the waste water introduction pipe 12, the amount of organic solid particles discharged from the turbid liquid discharge pipe 14 can be increased. However, increasing the flow rate ratio of the turbid liquid discharge pipe 14 leads to an increase in the flow rate of the turbid liquid introduced into the sedimentation separation device 20.
In this case, the ratio of the flow rate of the turbid liquid discharge pipe 14 to the flow rate of the waste water introduction pipe 12 (UF flow rate ratio) is preferably 20% or more and 50% or less, more preferably 30% or more and 45% or less, and 35% or more and 40% or less. % or less is more preferable.

(Sedimentation separation device 20)
Referring to FIG. 1, the sedimentation separation device 20 includes an inclined pipe 21, a turbid liquid tank 22, a clean liquid area 23, and a chain conveyor 30. The waste water discharged from the turbid liquid discharge pipe 14 of the hydrocyclone device 10 enters the turbid liquid tank 22 via the turbid liquid chute, goes up the inclined pipe 21 and enters the cleaning liquid area 23.
As shown in FIG. 3, the inclined tube 21 is an assembly of tubes having an inner diameter Φp, an inclination θp, and a height Hp. If the organic solid particles in the inclined tube 21 settle by a maximum distance h (=φp/cos(θp)), they will reach the wall surface of the inclined tube 21 and be deposited thereon, and when the amount of accumulation increases to a certain extent, they will slide down the wall surface and become sloped. It falls below the pipe 21.
In this case, the length of the inclined pipe 21 is L = Hp/sin (θp), so the input flow rate to the inclined pipe 21 is M, the viscosity of the wastewater is μ, the gravitational acceleration is g, and the specific gravity of the organic solid particles is s. , the density of the wastewater is ρ, and the particle size of the smallest organic solid particle that can settle is d, then Equation 1 described in paragraph [0035] of the specification of Patent Document 5 becomes Equation 2 below.
That is, in order to precipitate organic solid particles having a predetermined particle size d in the inclined tube 21, the input flow rate to the inclined tube 21 cannot be greater than M determined by the above equation 2. Therefore, as the amount of wastewater introduced into the sedimentation separator 20 increases, it becomes necessary to increase the number of inclined pipes 21.
On the other hand, since the wastewater treatment device 100 of the present invention is portable and the volume of the sedimentation separation device 20 is limited, the number of inclined pipes 21 is also limited. Therefore, since the input flow rate to the sedimentation separator 20 is also limited, in the wastewater treatment apparatus 100 of the present invention, the concentration of organic solid particles in the wastewater is first compressed by the hydrocyclone device 10 and then introduced into the sedimentation separator 20. This improves processing capacity per unit volume.

In this case, the angle of inclination of the inclined tube 21 is preferably 45° or more and 70° or less, and most preferably 60°. Further, in the case of a honeycomb structure, the diameter of the inclined tube 21 is preferably 40 mm or more and 80 mm or less, and more preferably 50 mm or more and 60 mm or less. Thereby, clogging is less likely to occur and the organic solid particles can be efficiently precipitated.
Further, the number of tubes in the inclined tube 21 is preferably 485 or more and 905 or less, more preferably 604 or more and 724 or less. The volume of the entire inclined pipe 21 is preferably 0.9 m ³ or more and 1.7 m ³ or less, more preferably 1.1 m ^{3 or} more and 1.4 m ^{3 or} less. As a result, organic solid particles can be sufficiently settled when used in conjunction with the liquid cyclone 11, and the wastewater treatment apparatus can be made small and portable.

In the sedimentation separator 20, a chain conveyor 30 is installed at the bottom of the turbid liquid tank 22. A mass of organic solid particles falling from the inclined pipe 21 is deposited on this chain conveyor 30. The mass of organic solid particles deposited on the chain conveyor 30 is discharged into the sludge tank 40 by intermittent operation of the chain conveyor 30.
The reason why the chain conveyor 30 is operated intermittently rather than continuously is because when the chain conveyor 30 is operated continuously, turbulent flow occurs in the turbid liquid tank 22 and organic solid particles are rolled up into the turbid liquid tank 22. be.
On the other hand, when the chain conveyor 30 is intermittently operated, organic solid particles accumulated on the wall of the inclined pipe 21 fall from the inclined pipe 21 due to changes in the water flow in the turbid liquid tank 22, thereby preventing clogging of the inclined pipe 21. You can also obtain the effect of The frequency of intermittent operation is preferably 3 minutes or more and 10 minutes or less, more preferably 5 minutes or more and 8 minutes or less every 60 minutes.

The cleaning liquid area 23 is provided with a cleaning liquid area discharge pipe 24 and a submersible pump 25 with a float. When the water level in the cleaning liquid area 23 reaches a predetermined height, the submersible pump 25 with a float operates to drain the cleaning liquid area 23. of water is discharged.

(Example 1)
The inner diameter of the cylindrical part is 97.6 mm, the length of the cylindrical part is 97.6 mm, the length of the conical part is 220 mm, the diameter of the cleaning liquid discharge pipe 13 is 37.1 mm, and the diameter of the turbid liquid discharge pipe 14 is 28. Drainage water containing various concentrations of organic solid particles was introduced into a liquid cyclone 11 with a diameter of 4 mm and an opening angle θ1 of the conical part 18 of 17.4 degrees, and the concentration of organic solid particles in the turbid liquid discharge pipe and the organic solid particles in the raw solution were measured. The ratio to the solid particle concentration (also referred to as UF concentration ratio) was investigated. The frequency of the pressurizing pump 16 was 55 Hz, the flow rate of the stock solution was 79 l/m, the flow rate of the stock solution was 5.6 m/s, and the ratio of the flow rate of the turbid liquid discharge pipe 14 to the flow rate of the stock solution (also referred to as UF flow rate ratio) was 38%. Ta. Note that UF is an abbreviation for Underflow. Further, the cleaning liquid discharge pipe 13 side is also referred to as OF (Overflow).
FIG. 4 shows a graph of the relationship between the concentration of organic solid particles in the stock solution and the UF compression ratio. In the case of waste water from the wet dust collector 200, which is the main subject of the present invention, the concentration of organic solid particles in the waste water varies greatly depending on the use of the wet dust collector 200 and other factors. Therefore, wastewater with a wide range of concentrations from about 300 SSmg/l to 1600 SSmg/l was introduced into the wastewater treatment apparatus 100, and the UF concentration ratio was confirmed. Note that the concentration of organic solid particles in FIG. 4 is the concentration of particles having a particle size of 41 μm or more.
The UF concentration ratio was in the range of 1.5 to 2.1, indicating that stable concentration was possible. The average value of the UF concentration factor is 1.71. In addition, in this case, the proportion of organic solid particles discharged to the UF side (also referred to as UF discharge ratio) among the organic solid particles in the stock solution is 0.38 x 1.71 = 0.64 on average, that is, in the stock solution 64% of the organic solid particles were discharged to the UF side. These 64% organic solid particles are separated by sedimentation in the sedimentation separator 20, and are discharged into the sludge tank 40 by intermittent operation of the chain conveyor 30.

FIG. 5 shows the configuration when the waste water from the water tank 240 is circulated in the waste water treatment device 100, and FIG. 6 shows the change in the organic solid particle concentration in that case. The wastewater from the water tank 240 is introduced into the wastewater treatment device 100 through the wastewater introduction port 19, and the wastewater discharged from the cleaning liquid discharge pipe 13 and the cleaning liquid area discharge pipe 24 is returned to the water tank 240.
As can be seen from FIG. 6, when the waste water in the water tank 240 was treated by circulating it, the concentration of particles of 41 μm or more was reduced to about 1/3 in 60 minutes. On the other hand, the concentration of particles from 10 μm to 41 μm hardly changes. This means that in this example, particles of 41 μm or more are not sheared by the hydrocyclone 11 and divided into multiple particles of 41 μm or less, and that particles of 41 μm or less are not removed by the sedimentation separator 20. . Note that in the sedimentation separator 20, the particle size of the particles that can be settled changes depending on the input flow rate as shown in Equation 2, so it is preferable to adjust the input flow rate in accordance with the particle size of the organic solid particles to be removed.

(Example 2)
The UF concentration ratio and the UF discharge ratio were measured using the same liquid cyclone 11 as in Example 1 except that the opening angle θ1 of the conical portion 18 of the liquid cyclone 11 was changed to 20.5 degrees. The flow rate of the stock solution was also the same as in Example 1, 5.6 m/s.
Comparing Example 2 with Example 1, the UF flow rate ratio was 38%, the same as Example 1, but the UF concentration ratio was slightly lower at 1.65 times, and as a result, the UF discharge ratio was also slightly lower at 63%. decreased. From this result, it is preferable that the opening angle θ1 is 17.4 degrees than 20.5 degrees because it allows the UF concentration ratio and UF discharge ratio to be higher, although slightly.

(Example 3)
The shape of the hydrocyclone 11 was the same as in Example 1, but the frequency of the pressurizing pump 16 was changed from 55 Hz to 60 Hz to increase the driving force, and the flow rate of the stock solution was set to 7 m/s.
Comparing Example 3 with Example 1, as the flow rate of the stock solution increased, the UF flow rate ratio decreased slightly to 33%, and as a result, the UF concentration ratio increased slightly to 1.89 times; The UF emission ratio, which is the proportion of organic solid particles in the air, decreased slightly to 62%.

(Comparative example 1)
The diameter of the turbid liquid discharge pipe 14 of the liquid cyclone was changed to 23.9 mm, and the UF flow rate ratio was reduced to 28%.
Comparing Comparative Example 1 with Example 1, the UF concentration ratio increased to 1.94 times as the UF flow rate decreased, but because the UF flow rate was low, the proportion of organic solid particles discharged to the UF side was One UF emission ratio decreased to 55%.

(Comparative example 2)
In Comparative Example 2, the diameter of the clean liquid discharge pipe 13 was 19.4 mm, the diameter of the turbid liquid discharge pipe 14 was 11.4 mm, and the ratio of the diameters on the UF side and the OF side was increased compared to Example 1. It is. In this case, the UF flow rate ratio decreased significantly to 13%, and the UF concentration ratio increased to 3.54 times, but because the UF flow rate was low, the UF discharge ratio, which is the proportion of organic solid particles discharged to the UF side. decreased to 46%.

FIG. 7 shows the relationship between the flow rate of the stock solution, the shape of the liquid cyclone 11, the UF flow rate ratio, the UF concentration ratio, and the UF discharge ratio in Examples and Comparative Examples. Moreover, FIG. 8 shows a graph of the relationship between the UF flow rate ratio, the UF concentration ratio, and the UF discharge ratio. The lower the UF flow rate ratio, the higher the UF concentration ratio, but the lower the flow rate on the UF side, the lower the UF discharge ratio. On the other hand, when the UF flow rate ratio is increased, the UF discharge ratio increases, but the flow rate on the UF side increases, so the input flow rate of the sedimentation separator 20 connected to the hydrocyclone device 10 increases.
Therefore, the appropriate range of the UF flow rate ratio is preferably 20% or more and 50% or less, more preferably 30% or more and 50% or less, and even more preferably 35% or more and 40% or less.

The UF flow rate ratio basically depends on the ratio of the diameters of the turbid liquid discharge pipe 14 and the clean liquid discharge pipe 13 (also referred to as Du/Do ratio), and as the turbid liquid discharge pipe 14 is made smaller, the UF flow rate ratio decreases. do. FIG. 9 shows the relationship between the Du/Do ratio and the UF flow rate ratio. When the appropriate range of the UF flow rate ratio is 30% or more, the Du/Do ratio is preferably about 0.75 or more. However, if the flow rate of the stock solution is increased, the UF flow rate ratio decreases slightly (see Example 1 and Example 3 in FIG. 7), so it is more preferable to check the actual UF flow rate ratio.

In this embodiment, by setting the UF flow rate ratio to an appropriate value by adjusting the Du/Do ratio, the concentration of organic solid particles in the turbid liquid discharge pipe 14 of the liquid cyclone device 10 is increased, and at the same time, the concentration of organic solid particles in the sedimentation separator 20 is increased. By reducing the input flow rate, a compact wastewater treatment device 100 with higher efficiency and portability was realized.

[Wet type dust collector 200 of second embodiment]
FIG. 10 is a schematic diagram showing an example of a wet dust collector 200 including a wastewater treatment device 100 according to the second embodiment.
The wet dust collector 200 includes the wastewater treatment device 100 of the first embodiment, a dust removal chamber 210, and a water tank 240. The dust removal chamber 210 is equipped with a water shower 220, and the waste water pressurized by the water shower pump 230 is bombarded with air containing a large amount of dust coming from the gas inlet 260, so that the dust is collected in the waste water, and the filter plate 250 collects the dust. After removing large dust particles, it is returned to the water tank 240. Then, the airflow containing organic solid particles entering from the gas inlet 260 is exhausted from the gas outlet 270 as clean air.
On the other hand, the waste water treatment device 100 takes in water from the water tank 240 through the waste water inlet 19, and returns the output from the clean liquid discharge pipe 13 of the hydrocyclone 11 and the clean liquid area discharge pipe 24 of the sedimentation separation device 20 to the water tank 240. Note that a chain conveyor (not shown) for discharging sludge is also installed in the water tank 240.

In the wet dust collector 200 of the second embodiment, the liquid cyclone 11 concentrates the waste water containing dust (organic solid particles) taken in in the dust removal chamber 210, and the dust in the concentrated waste water is transferred to the sedimentation separator 20. By intermittently operating the chain conveyor 30 and discharging the settled organic solid particles into the sludge tank 40, the concentration of dust in the water tank 240 is kept low and the dust collection in the wet dust collector 200 is performed. Capacity can be maintained for a long time.
Further, by keeping the concentration of dust in the water tank 240 low, it is also possible to suppress the odor and bubbles of the waste water in the water tank 240.

In this embodiment, the wastewater treatment device 100 corresponds to a "wastewater treatment device," the hydrocyclone device 10 corresponds to a "liquid cyclone device," the sedimentation separation device 20 corresponds to a "sedimentation separation device," and the liquid cyclone device 10 corresponds to a "sedimentation separation device." 11 corresponds to a "liquid cyclone", the pressurizing pump 16 corresponds to a "pressurizing pump", the cylindrical part 17 corresponds to a "cylindrical part", the conical part 18 corresponds to a "conical part", and the wastewater introduction The pipe 12 corresponds to a "drainage introduction pipe", the turbid liquid discharge pipe 14 corresponds to a "turbid liquid discharge pipe", the clean liquid discharge pipe 13 corresponds to a "clean liquid discharge pipe", and the pressure measuring device 15 corresponds to a "turbid liquid discharge pipe". The inclined pipe 21 corresponds to a "pressure measuring device", the slanted pipe 21 corresponds to a "slanted pipe", the turbid liquid tank 22 corresponds to a ``turbid liquid tank'', the clean liquid area 23 corresponds to a ``clean liquid area'', and the chain conveyor 30 corresponds to a "chain conveyor", the wet type dust collector 200 corresponds to a "wet type dust collector", the dust removal chamber 210 corresponds to a "dust removal chamber", and the water tank 240 corresponds to a "water tank".

Although a preferred embodiment of the present invention is as described above, the present invention is not limited thereto. It will be appreciated that various other embodiments may be made without departing from the spirit and scope of the invention. Further, in this embodiment, the functions and effects of the configuration of the present invention are described, but these functions and effects are merely examples and do not limit the present invention.

Explanation of the sign

10 Hydrocyclone device 11 Hydrocyclone 12 Drainage introduction pipe 13 Clean liquid discharge pipe 14 Turbid liquid discharge pipe 15 Pressure measuring device 16 Pressure pump 17 Cylindrical part 18 Conical part 19 Wastewater inlet 20 Sedimentation separation device 21 Inclined pipe 22 Turbid liquid tank 23 Clean liquid area 24 Clean liquid area discharge pipe 25 Submersible pump with float 26 Turbid liquid chute 30 Chain conveyor 40 Sludge tank 100 Wastewater treatment device 200 Wet dust collector 210 Dust removal chamber 220 Water shower 230 Water shower pump 240 Water tank 250 Filter plate 260 Gas inlet 270 Gas outlet

Claims (9)

A portable wastewater treatment device,
a liquid cyclone device that separates wastewater containing organic solid particles into a turbid liquid and a clean liquid;
a sedimentation separation device that sediments and separates the organic solid particles in the turbid liquid discharged from the liquid cyclone device,
The liquid cyclone device includes a liquid cyclone and a pressure pump that injects wastewater into the liquid cyclone,
The liquid cyclone includes a main body consisting of a cylindrical part and a conical part whose diameter gradually decreases from below the cylindrical part, a waste water introduction pipe connected to the cylindrical part, and a turbid liquid formed by opening the bottom of the conical part. It has a discharge pipe, a cleaning liquid discharge pipe opening at the center of the upper surface of the cylindrical part, and a pressure measuring device for measuring the pressure of the waste water introduced into the waste water introduction pipe,
The sedimentation separation device includes a plurality of inclined pipes, a turbid liquid tank disposed at a lower part of the inclined pipes and connected to the turbid liquid discharge pipe, and a cleaning liquid area arranged at an upper part of the inclined pipes. , wastewater treatment equipment. The liquid cyclone is configured to concentrate the organic solid particles with a specific gravity of 1.2 or more and 1.7 or less and discharge them as a turbid liquid, and to suppress shearing of the organic solid particles,
The ratio of the flow rate of the turbid liquid discharge pipe to the flow rate of the waste water introduction pipe is such that the organic solid particles discharged from the turbid liquid discharge pipe are within a range that allows the flow rate of the turbid liquid introduced into the sedimentation separation device. The wastewater treatment device according to claim 1, wherein the amount of waste water is set to be maximum. The liquid cyclone is capable of concentrating the organic solid particles having a specific gravity of 1.2 or more and 1.7 or less, and the flow rate of the liquid introduced into the wastewater introduction pipe is 2 m/sec or more and 10 m/sec or less, and The wastewater treatment device according to claim 1, wherein the inner diameter of the wastewater introduction pipe is 11 mm or more and 18 mm or less, and the inner diameter of the cylindrical portion is 70 mm or more and 103 mm or less. The wastewater treatment device according to claim 2, wherein the ratio of the flow rate of the turbid liquid discharge pipe to the flow rate of the wastewater introduction pipe is 0.3 or more and 0.5 or less. further comprising a chain conveyor inside the turbid liquid tank;
The wastewater treatment device according to claim 4, wherein the organic solid particles that have settled and accumulated from the inclined pipe are discharged by the chain conveyor. The wastewater treatment apparatus according to claim 5, wherein the chain conveyor is operated intermittently during wastewater treatment. The liquid cyclone device is configured by connecting a plurality of liquid cyclones in parallel,
The wastewater treatment apparatus according to claim 6, wherein each of the plurality of hydrocyclones can individually adjust the amount of wastewater flowing into the wastewater introduction pipe. The wastewater treatment device according to any one of claims 1 to 7, which treats wastewater containing the organic solid particles discharged from a wet dust collector. A wet collection system in which an airflow containing organic solid particles such as grain dust is passed through a water film formed in the device to collect the organic solid particles in water, and the airflow is exhausted as clean air. A dust device,
A dust removal room,
a water tank for collecting water in which the organic solid particles have been collected;
The wastewater treatment device according to any one of claims 1 to 7, which removes the organic solid particles in wastewater,
Wastewater from the water tank is introduced into the wastewater treatment device,
A wet type dust collector, wherein drainage from the cleaning liquid discharge pipe of the liquid cyclone and the cleaning liquid area is returned to the water tank.