JP7333246B2 - Pretreatment device for portable wastewater treatment evaluation and wastewater treatment evaluation method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a portable pretreatment device for wastewater treatment evaluation and a wastewater treatment evaluation method.

BACKGROUND ART Conventionally, in various industries, industrial wastewater containing organic substances has been treated by an activated sludge method (see, for example, Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2002-210486)).
The activated sludge method is a method of biologically treating organic wastewater aerobically. The process is designed so that the amount of BOD in the wastewater added to the waste water is about 0.2 to 0.4 kgBOD/(kgMLSS/day).

As a wastewater treatment method by the activated sludge method, for example, after collecting industrial wastewater discharged from various factories in a buffer tank, the industrial wastewater in this buffer tank is subjected to oil-water separation treatment, coagulation treatment (coagulation sedimentation treatment) Or coagulation flotation treatment), etc.), and then secondary treatment such as activated sludge treatment, so that organic matter such as phenol, benzene, etc., nitrogen, phosphorus, etc. We are doing biological treatment.

Japanese Patent Application Laid-Open No. 2002-210486

However, in the wastewater treatment by the activated sludge method, the amount of organic matter, nitrogen, phosphorus, etc. In order to meet the standards, it is necessary to appropriately change the operating conditions of wastewater treatment facilities, especially the operating conditions of activated sludge treatment equipment.
When determining the operating conditions of the activated sludge treatment apparatus, it is not always possible to predict the load on the activated sludge if waste water is introduced directly into the activated sludge treatment apparatus. It is conceivable to introduce the above-described waste water into a stationary evaluation device and determine various waste water treatment conditions.

On the other hand, if the wastewater treatment plant to be evaluated is located far from the installation location of the evaluation equipment, the wastewater and activated sludge from the wastewater treatment plant are brought to the installation location of the evaluation equipment one by one, and various regulation values are set. It is necessary to determine the wastewater treatment conditions through trial and error so as to satisfy the requirements and feed back the relevant wastewater treatment conditions to the wastewater treatment plant. If not, it is necessary to correct the wastewater treatment conditions using the evaluation device again.
In this case, if the wastewater treatment plant to be evaluated is located in a distant place such as overseas, wastewater or activated sludge from the wastewater treatment plant to the installation location of the evaluation device may be required before determining the wastewater treatment conditions of the wastewater treatment plant. Not only is it necessary to exchange complicated information between the operator of the wastewater treatment facility and the evaluation side using the evaluation device, but there are restrictions on taking out or bringing in wastewater or activated sludge itself, and wastewater or activated sludge Therefore, it was difficult to perform appropriate evaluation because it is assumed that the quality of the material may deteriorate before it is transported to the evaluation apparatus.

Under such circumstances, the present inventors installed a small activated sludge treatment facility in the wastewater treatment facility and obtained treated water by treating under the same conditions as the activated sludge treatment equipment in the actual wastewater treatment plant. , it was conceived that wastewater treatment conditions can be evaluated easily in a short time.

By the way, the above-mentioned small activated sludge treatment facility does not need to be a permanent facility, and it is sufficient if it is a temporary facility. A device with portability is required.
On the other hand, in order to properly evaluate wastewater treatment conditions, a small coagulation tank for performing coagulation treatment (coagulation sedimentation treatment or coagulation flotation treatment) as a pretreatment device is required along with a small activated sludge treatment facility.

However, as a result of investigation by the present inventors, when the wastewater to be treated contains oil, SS (suspended solids), etc., if the wastewater is to be treated by flowing into the flocculation tank, it will float on the tank wall. It was found that deposits of substances were formed in layers. In an actual wastewater treatment plant, the scale of the flocculation tank is so large that the formation and amount of deposits on the walls of the tank are negligible, but the size of the flocculation tank is portable. If the size is reduced to 10, the presence of deposits on the tank wall cannot be ignored, making it difficult to carry out appropriate agglomeration treatment.
In this case, it is necessary to stop the operation of the small-sized flocculation tank equipment, clean the tank walls, and then restart the operation, which makes it difficult to quickly and accurately evaluate wastewater treatment.

Therefore, according to the present invention, there is provided a portable wastewater treatment evaluation pretreatment device and a wastewater treatment evaluation method for simply and quickly evaluating wastewater treatment conditions while suppressing the formation of deposit layers on tank walls. It is intended for

Under these circumstances, the inventors of the present invention have made intensive studies and found that a portable pretreatment device for evaluating wastewater treatment includes a coagulation tank with an internal capacity of 3 to 12 L into which wastewater flows, and a tank in the coagulation tank. , a stirring blade provided with a widened portion made of a flexible resin on at least a part of the outer edge, and a vertical position moving means capable of adjusting the position of the stirring blade in the vertical direction of the aggregation tank, and the stirring blade We have found that the above technical problems can be solved by a portable pretreatment device for evaluating wastewater treatment, in which the widened portion is arranged so as to be able to contact the inner wall of the flocculation tank when the stirring blade rotates, and the present invention is based on this finding. was completed.

That is, the present invention
(1) A portable pretreatment device for evaluating wastewater treatment,
A coagulation tank with an internal volume of 3 to 12 L into which waste water flows;
a stirring blade provided with a widened portion made of a flexible resin on at least a part of an outer edge portion in the tank of the aggregation tank;
A vertical position moving means capable of adjusting the position of the stirring blade in the vertical direction of the aggregation tank,
A portable pretreatment device for wastewater treatment evaluation, wherein the widened portion of the stirring blade is arranged so as to be in contact with the inner wall of the flocculation tank when the stirring blade rotates,
(2) The portable pretreatment device for evaluating wastewater treatment according to (1) above, wherein the stirring blade is a stirring propeller;
(3) further comprising a storage chamber communicating with the aggregation tank and storing the aggregate-treated water treated in the aggregation tank, and having a discharge pipe for discharging the aggregate-treated water stored in the storage chamber;
The portable type according to (1) or (2) above, wherein the water intake port of the discharge pipe is pulled into the storage chamber and is arranged so as to be vertically movable so as to be positioned near the surface of the stored aggregate-treated water. and (4) a wastewater treatment evaluation method comprising treating wastewater using the portable pretreatment equipment for wastewater treatment evaluation according to any one of (1) to (3) above. It provides

According to the present invention, the stirring blade provided in the coagulation tank has a widened portion made of a flexible resin on at least a part of the outer edge, and the widened portion contacts the inner wall of the coagulation tank when the stirring blade rotates. In addition, the stirring blade is arranged so as to be movable in the vertical direction of the coagulation tank by the vertical position moving means, so that the coagulation treatment is preferably performed while removing the deposits generated on the tank wall. becomes possible.
Therefore, according to the present invention, there is provided a portable wastewater treatment evaluation pretreatment device and a wastewater treatment evaluation method for simply and quickly evaluating wastewater treatment conditions while suppressing the formation of deposit layers on tank walls. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram (perspective view) for explaining an example of the form of a portable pretreatment device for evaluation of wastewater treatment according to the present invention; BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram (front view) for explaining an example of the form of a portable pretreatment device for evaluation of wastewater treatment according to the present invention; FIG. 2 is a schematic diagram showing an example of the form of the stirring blade in the portable pretreatment device for wastewater treatment evaluation according to the present invention. FIG. 2 is a schematic diagram showing an example of the form of a stirring blade in the portable pretreatment device for wastewater treatment evaluation according to the present invention. FIG. 2 is a schematic diagram showing an example of vertical position movement of the stirring blade in the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention. FIG. 2 is a schematic diagram showing an example of vertical position movement of the stirring blade in the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention. FIG. 3 is a schematic diagram (perspective view) for explaining another embodiment of the portable pretreatment apparatus for evaluation of wastewater treatment according to the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram for explaining an embodiment of wastewater treatment evaluation using a portable pretreatment device for wastewater treatment evaluation according to the present invention;

A portable pretreatment device for evaluating wastewater treatment according to the present invention includes a flocculation tank with an internal capacity of 3 to 12 L into which wastewater flows, and a widened width made of a flexible resin at least part of the outer edge in the flocculation tank. and a vertical position moving means capable of adjusting the position of the stirring blade in the vertical direction of the coagulation tank, and the widened portion of the stirring blade contacts the inner wall of the coagulation tank when the stirring blade rotates. It is characterized by being arranged so as to be able to

DESCRIPTION OF THE PREFERRED EMBODIMENTS A portable pretreatment apparatus for wastewater treatment evaluation according to the present invention will be described below with appropriate reference to the drawings.

In the portable pretreatment apparatus for evaluating wastewater treatment according to the present invention, wastewater to be treated is not particularly limited as long as it is organic matter-containing wastewater that is usually treated with an activated sludge treatment apparatus.
For example, it may be one or more selected from industrial wastewater containing organic substances such as various petroleum fractions, lubricating oils, organic solvents, oils and fats, sugar solutions, fermentation liquids, etc., domestic wastewater, etc., and these industrial wastewater and One or more kinds selected from domestic wastewater or the like may be subjected to oil-water separation treatment.

1 and 2 are schematic diagrams for explaining an example of the form of a portable pretreatment apparatus for wastewater treatment evaluation according to the present invention, where FIG. 1 corresponds to a perspective view and FIG. 2 corresponds to a front view.

As shown in FIG. 1, a portable pretreatment apparatus 10 for evaluation of wastewater treatment according to the present invention includes a flocculation tank 11 into which wastewater flows, a stirring blade 12, and the agitating blade 12 is vertically arranged in the vertical direction of the flocculation tank 11. A vertical position moving means 14 whose position is movably adjustable is provided.

In the portable wastewater treatment evaluation pretreatment device according to the present invention, the content of the coagulation tank is 3 to 12 L, preferably 4 to 10 L, more preferably 5 to 8 L. preferable.
Since the content of the coagulation tank is within the above range, it is possible to easily perform coagulation treatment in a space-saving manner under the same conditions as the actual equipment (coagulation tank in an actual wastewater treatment plant) while maintaining portability. can.

In the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention, the form of the flocculation tank is not particularly limited, but the form is usually such that the internal shape of the tank into which the wastewater flows and is flocculated has a substantially cylindrical shape. preferable.
When the internal shape of the aggregation tank is cylindrical, the size is preferably about 150 to 250 mm in inner diameter and 100 to 500 mm in height.
Since the size of the inside of the coagulation tank is within the above range, the activated sludge treatment can be easily performed in a space-saving manner under the same conditions as in the actual machine while maintaining portability.

The coagulation tank usually has an inlet for waste water to be treated and an outlet for waste water after coagulation treatment.
In the flocculation tank 11 illustrated in FIGS. 1 and 2, waste water flows in from the inlet Din shown in the figures, and waste water that has been flocculated in the tank flows out from the outlet Dout.

As exemplified in FIGS. 1 and 2, in the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention, the flocculation tank 11 has a substantially cylindrical shape and is provided with a tapered partition plate P3 at the bottom of the tank. , and may have a tapered (inverted conical) bottom portion B with an inner diameter that narrows from top to bottom in the vertical direction.

Since the flocculation tank has a tapered bottom, the flocculation that has flocculated and sedimented in the flocculation tank can be easily extracted from the lowest part of the flocculation tank.

In the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention, the side walls, bottom, etc. of the flocculation tank are not particularly limited in terms of material, thickness, etc., as long as they require a predetermined strength, etc., and are transparent or translucent. By using a transparent or translucent resin plate or the like, it is possible to easily observe the inside and to easily reduce the weight.

The portable pretreatment device for wastewater treatment evaluation according to the present invention has a stirring blade, and the stirring blade is usually supported by a support rod (as illustrated in FIGS. 1 and 2). Placed in a flocculation tank.
The portable pretreatment device for wastewater treatment evaluation according to the present invention rotates the stirring blades so that wastewater to be treated and a flocculant (for example, an inorganic flocculant such as aluminum sulfate or a high one or more selected from molecular flocculants) can be suitably mixed.

In the portable pretreatment device for wastewater treatment evaluation according to the present invention, the stirring blade is provided with a widened portion made of a flexible resin on at least a part of the outer edge portion.

In the portable wastewater treatment evaluation pretreatment device according to the present invention, the shape of the stirring blade 12 is not particularly limited, and as shown in FIGS. ), or as shown in FIG. 4, it may be plate-shaped.
In the portable pretreatment device for wastewater treatment evaluation according to the present invention, when the shape of the stirring blade 12 is plate-like, it has a shape corresponding to the internal shape of the coagulation tank of the sedimentation tank 3 in which the stirring blade is arranged. is preferable, for example, when the bottom of the aggregation tank 11 is tapered and has an inverted conical shape as illustrated in FIGS. A triangular shape as shown in FIG. 4 is preferred.

In the portable pretreatment device for wastewater treatment evaluation according to the present invention, the stirring blade placed in the flocculation tank has a widened portion made of a flexible resin on at least a part of the outer edge portion, and the widened portion is the stirring blade It is arranged so that it can come into contact with the inner wall of the flocculation tank when it rotates.

In the portable pretreatment device for wastewater treatment evaluation according to the present invention, the shape of the widened portion provided at the outer edge of the stirring blade is such that the widened portion can contact the inner wall of the sedimentation tank when the stirring blade rotates. It is not particularly limited, and the method of fixing the widened portion may be a method of inserting a tubular flexible resin into the blade and fixing it, or a method of attaching and fixing the flexible resin to the blade. It may be integrally formed when the stirring blade is manufactured.
For example, as illustrated in FIG. 3A, by inserting and fixing a tube-shaped resin made of a flexible resin into the tip of the propeller-shaped blade, the outer edge of the stirring blade 12 is widened at the widened portion R Further, as shown in FIG. 3(b), by inserting and fixing a tube-shaped resin made of a flexible resin whose tip is appropriately cut out into the tip of the propeller blade, It may be a widened portion R obtained by widening the outer edge of the stirring blade 12 .
Alternatively, for example, as shown in FIG. 4, a strip of flexible resin cut out is pasted on the tip of the side portion of the plate-shaped stirring blade 12 (the inclined portion facing the side wall of the aggregation tank when arranged). It may be a widened portion R obtained by widening the outer edge of the stirring blade by fixing it.

In the portable pretreatment device for wastewater treatment evaluation according to the present invention, the widened portion provided at the outer edge of the stirring blade means a portion that can come into contact with the inner wall of the sedimentation tank when the stirring blade rotates. Normally, the stirring blades are selected and arranged so as not to contact the walls of the flocculation tank during use. It rotates without contacting the inner wall of the flocculating tank and agitates the waste water flowing into the flocculating tank, but only the widened portion provided on the stirring blade contacts the inner wall of the flocculating tank when the stirring blade rotates.
The stirring blade usually has a symmetrical shape with respect to the axis of rotation. Therefore, it does not necessarily have the symmetrical shape described above.

In the portable pretreatment device for wastewater treatment evaluation according to the present invention, the flexible resin constituting the widened portion provided on the outer edge of the stirring blade is flexible when the stirring blade rotates and comes into contact with the inner wall of the sedimentation tank. It means a material having flexibility, and is not particularly limited. Examples include polyolefins such as polyethylene and ethylene propylene rubber, butadiene rubber, ethylene propylene rubber, or graft rubber obtained by grafting (meth)acrylic polymer chains onto acrylic rubber. , urethane-based rubber, thermoplastic polyurethane, acrylic rubber, acrylic-based thermoplastic polymer, siloxane-based thermoplastic polymer, silicone resin, and the like.

As illustrated in FIGS. 1 and 2, the stirring blades 12 are arranged in the aggregation tank 11 while being fixed to the support rods 13, and the support rods 13 are provided with a stirring device (rotating device) 16. Then, the inside of the aggregation tank 11 can be stirred by rotating the stirring blade 12 at a desired rotation speed via the support rod 13 .

The portable pretreatment apparatus for wastewater treatment evaluation according to the present invention has vertical position moving means capable of adjusting the position of the stirring blade in the vertical direction of the coagulation tank (the height direction of the coagulation tank).

In the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention, the structure and shape of the means for moving the stirring blade up and down are not particularly limited.

FIG. 5 illustrates a vertical position moving method (vertical position changing method) of the stirring blade 12 in the vertical position moving means 14 in the exemplary form of the portable pretreatment apparatus for evaluation of wastewater treatment illustrated in FIGS. It is a diagram for
Vertical position moving means 14 shown in FIG. At the side, it is fixed to the side wall of the flocculation tank by means of screws C, C. The vertical position moving means 14 shown in FIG. 5 is provided so as to cross a pair of bolts M3, M3 erected on the bridging member M1, and the upper part of the bridging member M1. It has a plate-shaped positioning member M2 fixed to the support rod 13 in a state in which M1 is passed therethrough.
The positioning member M2 is inserted through the support rod 13 so as to be rotatable, and is fixed to the bolts M3, M3 by nuts n, n so that the vertical position can be determined arbitrarily. .

In the portable wastewater treatment evaluation pretreatment device 10 illustrated in FIG. As shown in the right figure, the support rod 13 is pulled up, and then the nuts n, n provided on the pair of bolts M3, M3 are tightened to adjust the position of the stirring blade 12 in the upper direction of the aggregation tank 11 (upward direction). can be repositioned).
On the contrary to the above, in the portable wastewater treatment evaluation pretreatment device 10 illustrated in FIG. 5, the support rod 13 is pulled down, and then the nuts n, n provided on the pair of bolts M3, M3 are tightened, thereby moving the stirring blade 12 toward the bottom of the flocculation tank 11. It can be repositioned (repositioned downward).

FIG. 6 is a diagram for explaining a vertical movement method of the stirring blade 12 in the vertical position moving means 14 in a form example different from the form example of the portable wastewater treatment evaluation pretreatment apparatus illustrated in FIG. .

The vertical position moving means 14 shown in FIG. 6 is common to the vertical position moving means 14 shown in FIG. The bridging member M1 shown in FIG. 6 is common to the bridging member M1 shown in FIG. .

On the other hand, the vertical position moving means 14 shown in FIG. 6 does not have the positioning member M2 and the pair of bolts M3, M3. In addition, the bridging member M1 shown in FIG. 6 is inserted through the support rod 13 so as to be rotatable, and compared to the bridging member M1 shown in FIG. The length is long along the vertical direction of the coagulation tank (height direction of the coagulation tank), and the screw holes for fixing the screws C and C are also oriented in the vertical direction of the coagulation tank (height direction of the coagulation tank). Multiple are provided.

In the portable wastewater treatment evaluation pretreatment device 10 illustrated in FIG. By pulling up the bridging member M1 together with 13 and then tightening the pair of screws C, C, the position of the stirring blade 12 can be adjusted in the upward direction of the aggregation tank 11 (changed in the upward direction).
On the contrary to the above, in the portable wastewater treatment evaluation pretreatment device 10 illustrated in FIG. As shown in the figure, the bridging member M1 is pulled down together with the support rod 13, and then the pair of screws C, C are tightened to adjust the position of the stirring blade 12 in the lower direction of the aggregation tank 11 (change the position in the lower direction). can be done.

As described above, when the flocculation tank is made small enough to be portable, floating deposits are formed in layers on the sidewalls of the flocculation tank. Although it is difficult to perform, in the portable pretreatment device for evaluating wastewater treatment according to the present invention, the stirring blade provided in the flocculation tank has a widened portion made of a flexible resin on at least a part of the outer edge portion. The widened portion is arranged so as to come into contact with the inner wall of the coagulation tank when the stirring blade rotates, and the stirring blade is arranged so as to be movable in the vertical direction of the coagulation tank by the vertical position moving means, so that the tank wall It is possible to suitably carry out the aggregating process while removing the deposits generated in the process.
In addition, according to the present invention, by having a vertical position moving means that can adjust the position of the stirring blade in the vertical direction of the coagulation tank, the amount and type of coagulant used in the coagulation tank, and the wastewater to be treated. Depending on the amount or type, the vertical position of the stirring blade (the position in the height direction of the aggregation tank) can be changed to perform the optimum stirring process.

A portable pretreatment device for evaluating wastewater treatment according to the present invention includes a storage chamber that communicates with the flocculation tank and stores flocculated water treated in the flocculation tank, and a water intake that is drawn into the storage chamber and has a flocculation treatment. It may further have a discharge pipe arranged so as to be vertically movable so as to be positioned near the surface of the water.

FIG. 7 is a schematic view (perspective view) for explaining an example of the form of the portable pretreatment apparatus for evaluating wastewater treatment according to the present invention, which has the storage chamber and the discharge pipe.
In the example shown in FIG. 7, the portable wastewater treatment evaluation pretreatment apparatus 10 includes a flocculation tank 11 and a storage chamber 15 that communicates with the flocculation tank 11 and stores flocculated water treated in the flocculation tank 11. have more.

In the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention, the shape of the storage chamber 15 is not particularly limited, but the shape is generally box-shaped.
In the portable pretreatment device for wastewater treatment evaluation according to the present invention, the storage chamber has an internal capacity of
0.5 to 10 L is preferred, 1.0 to 8 L is more preferred, 2 to 5 L is even more preferred, and 1 to 5 L is even more preferred.
When the shape of the storage chamber is box-shaped, it is preferable that the size of the outer shape is about 100 to 200 mm in length, 100 to 200 mm in width, and 150 to 250 mm in height. Because the size of the storage chamber is within the above range, while maintaining portability, coagulation treatment can be easily performed in a space-saving manner under the same conditions as the actual machine (coagulation tank used in an actual wastewater treatment plant). be able to.
In the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention, the side wall, ceiling plate, floor plate, etc. of the storage chamber are not particularly limited in terms of material, thickness, etc., as long as they require a predetermined strength. It is preferable to use a semi-transparent resin plate or the like. By using a transparent or semi-transparent resin plate or the like, the inside can be easily observed and the weight can be easily reduced.

In the example shown in FIG. 7, a through hole P is provided between the flocculation tank 11 and the storage chamber 15 so that the flocculation treated water (treated water treated in the flocculation tank) can flow mutually. .

Further, in the example shown in FIG. 7, there is a discharge pipe T for discharging the aggregate-treated water stored in the storage chamber 15, and the water intake of the discharge pipe T is drawn into the storage chamber and the stored aggregate-treated water It is arranged so that it can move up and down so that it is positioned near the surface of the water.
The means for vertically moving the water intake of the discharge pipe T so as to be positioned near the surface of the flocculate-treated water is not particularly limited. For example, as shown in FIG. It has a structure housed in a coaxial double cylinder shape, and is designed so that the position of the water intake of the discharge pipe T can be moved up and down by an adjustment knob (not shown) so that it can be positioned near the water surface WS of the flocculate-treated water. I can list what I have.

As exemplified in FIG. 7, the portable pretreatment device for wastewater treatment evaluation according to the present invention has a storage chamber 15 together with a coagulation tank 11, and the storage chamber 15 is a flocculate-treated water treated in the flocculation tank 11. and is vertically movable so that the intake port of the discharge pipe T is located near the water surface WS of the flocculation treated water. It is possible to easily suppress the outflow of deposits scraped from the tank wall and the aggregates generated in the coagulation tank (by adding the coagulant).
By discharging only the supernatant liquid with a low content of deposits and aggregates as aggregate treated water from the outlet Dout in this way, the load of subsequent equipment (for example, a portable activated sludge treatment tank) can be easily reduced. can be reduced to
Further, as illustrated in FIG. 7, the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention has a storage chamber 15 together with a flocculation tank 11, and the storage chamber 15 is a flocculated material treated in the flocculation tank 11. A discharge pipe T for discharging the treated water is provided inside, and the intake port of the discharge pipe T is arranged so that it can move up and down so that it is located near the water surface WS of the flocculate treated water. It is possible to easily adjust the treatment capacity of the coagulation tank according to the actual equipment (coagulation tank used in the actual wastewater treatment plant).

FIG. 8 is a diagram for explaining an embodiment of wastewater treatment evaluation using a portable pretreatment device for wastewater treatment evaluation according to the present invention.
FIG. 8 shows a portable wastewater treatment evaluation apparatus in which a portable wastewater treatment evaluation pretreatment apparatus 10 according to one embodiment of the present invention and a portable activated sludge treatment tank 20 are combined.

The portable activated sludge treatment tank 20 preferably has an inflow nozzle N for inflowing the oxygen-containing gas upward from the bottom of the portable activated sludge treatment tank 20, and the gas flows into the activated sludge treatment tank from the inflow nozzle N. Oxygen-containing gas can include oxygen or air.

As illustrated in FIG. 8, the portable activated sludge treatment tank 20 has a discharge pipe t for discharging the activated sludge treated water, and the discharge pipe t is arranged in the storage chamber described above. As with the discharge pipe T, it is preferable that the intake port is drawn into the portable activated sludge treatment tank 20 and is arranged so as to be vertically movable so as to be positioned near the water surface of the activated sludge treated water.

In the example shown in FIG. 8, the discharge pipe t may be the same as the discharge pipe T described above.

As illustrated in FIG. 8, the portable wastewater treatment evaluation pretreatment device according to the present invention has a discharge pipe t for discharging the activated sludge treated water treated in the portable activated sludge treatment tank 20, The content of activated sludge treated by the portable activated sludge treatment tank 20 by arranging the water intake of the discharge pipe t so as to be able to move up and down so that it is positioned near the water surface of the activated sludge treated water Only the supernatant liquid with a low C can be discharged as the activated sludge treated water.

The portable pretreatment device for wastewater treatment evaluation according to the present invention requires a small flocculation tank, a small activated sludge treatment tank, etc., and optionally a stirring device, a pump, a conduit such as a hose, etc. By using it as a portable wastewater treatment evaluation treatment device combined with accessories, it is possible to reduce the size and weight of the entire device while assembling and disassembling it easily. can be easily transported and used.

When using the portable wastewater treatment evaluation pretreatment device according to the present invention, the same wastewater as the actual equipment (coagulation tank used in the actual wastewater treatment plant) is adopted, and wastewater treatment is performed under the conditions corresponding to the actual equipment. done.
In the portable wastewater treatment evaluation pretreatment device according to the present invention, the amount of wastewater supplied to the flocculation tank is preferably 5 to 50 mL / minute, and when a portable activated sludge treatment tank is used together with the flocculation tank The amount of waste water supplied to the portable activated sludge treatment tank is preferably 5 to 30 mL/minute.

The treated water obtained from the small-sized activated sludge treatment tank is measured by a known method, for example, biochemical oxygen demand (BOD), chemical oxygen demand (Chemical Oxygen Demand: COD), total organic Carbon (Total Organic Carbon: TOC), total nitrogen concentration, total phosphorus concentration, suspension concentration, etc. are measured, and it is evaluated whether various regulation values can be satisfied.

As a result of the above evaluation, if an item that does not satisfy the regulation value in the area where the wastewater treatment plant to be evaluated is installed is detected, the wastewater treatment conditions are further changed, and the portable wastewater treatment evaluation according to the present invention Wastewater treatment may be performed using a pretreatment device, and then the various inspection items may be evaluated again, and the wastewater treatment may be repeatedly performed until all regulatory values are satisfied.

According to the present invention, it is possible to provide a portable wastewater treatment pre-evaluation apparatus for simply and quickly evaluating wastewater treatment conditions while suppressing the formation of deposit layers on tank walls.

Next, the wastewater treatment evaluation method according to the present invention will be described.
A wastewater treatment evaluation method according to the present invention is characterized by treating wastewater using the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention.
The details of wastewater treatment for obtaining treated water using the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention are as described above.
As described above, the portable pretreatment apparatus for evaluating wastewater treatment according to the present invention can be used in combination with a suitable portable activated sludge treatment tank. Provided for physical property evaluation.
As composition evaluation or physical property evaluation of the obtained treated water, known evaluation items can be mentioned, for example, biochemical oxygen demand (Biochemical oxygen demand: BOD), chemical oxygen demand (Chemical Oxygen Demand: COD), Total Organic Carbon (TOC), total nitrogen concentration, total phosphorus concentration, suspension concentration and the like.
These evaluation items may be measured by known measurement methods corresponding to various evaluation items.

If the evaluation values (composition values or physical property values) in the above various evaluation items do not satisfy the regulations in the area where the wastewater treatment plant is installed, the portable wastewater treatment evaluation pretreatment device according to the present invention is used again to treat the wastewater. By appropriately repeating the operation of wastewater treatment after changing the conditions, the optimum wastewater treatment conditions can be determined.

According to the present invention, since the portable pretreatment apparatus for evaluating wastewater treatment according to the present invention is used, it is possible to easily evaluate and determine wastewater treatment conditions while suppressing the formation of deposit layers on the tank walls. can be done.

EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited thereto.

(Example 1)
A portable pretreatment apparatus 10 for wastewater treatment evaluation having the apparatus configuration shown in FIG. 7 was constructed.
As shown in FIG. 7, in the portable wastewater treatment evaluation pretreatment device 10 used in the present example, the coagulation tank 11 (with an internal capacity of 5 L, an inner diameter of 20 cm, and a length of 40 cm) into which the wastewater flows from the inlet Din is approximately cylindrical), a stirring blade 12 supported by a support rod 13, and a vertical position moving means 14 capable of adjusting the position of the stirring blade 12 in the vertical direction of the aggregation tank 11 were arranged.
In addition, in the portable wastewater treatment evaluation pretreatment apparatus 10 used in the present example, the storage chamber 15 (with an internal capacity of 2 L, The internal shape is 15 cm long, 15 cm wide, and 25 cm high), and the water intake is drawn into the storage chamber 15 and positioned near the water surface W13 of the stored aggregate-treated water. A discharge pipe T (with an inner diameter of 15 mm) for discharging the aggregate-treated water stored in the storage chamber 15, which is arranged so as to be vertically movable, is arranged.
The coagulation tank 11 and the storage chamber 15 are made of a transparent resin plate having a thickness of 4 to 6 mm and are easily visible from the outside.
The stirring blade (stirring propeller) 12 (each blade length is about 6 cm) arranged in the aggregation tank 11 has a form shown in FIG. By inserting a tube-shaped silicon resin with an inner diameter of 10 mm and fixing the tip of one blade out of the plurality of blades (the blade after inserting the above-mentioned tube-shaped silicone resin) length of about 24 cm), and a widened portion R is formed by widening the outer edge of the stirring blade 12, and the widened portion R is arranged so that it can contact the inner wall of the aggregation tank 11 when the stirring propeller 12 rotates.
In the portable wastewater treatment evaluation apparatus 10, the wastewater discharged from the oil refining facility is flowed into the flocculation tank 11 from the inlet Din at a speed of 20 ml/min, and the stirring propeller 12 is rotated at 1 to 10 rpm in the flocculation tank 11. While rotating at , aluminum sulfate was added as a flocculating agent to flocculate and precipitate the flocculate. The aggregate-treated water obtained by the aggregation treatment is made to flow into the storage chamber 15 through the through hole P, and the aggregate-treated water stored in the storage chamber 15 is discharged from the outlet Dout of the discharge pipe T at a rate of 15 ml/minute. drained.

At this time, (1) wastewater flowing in from the inlet Din, (2) wastewater near the water surface of the flocculation tank 11, (3) wastewater near the water surface of the storage chamber 15, and (4) wastewater flowing out from the outflow port Din, respectively. It was collected, and the absorbance (660 nm) and suspended particulate matter amount (mg/L) were measured by the following method. Table 1 shows the results.

<Method for measuring absorbance>
Each sample was collected in a cell for measurement, and the absorbance at a measurement wavelength of 660 nm was measured.

<Method for measuring the amount of suspended particulate matter>
Based on the JIS K 0102 industrial wastewater test method, each sample was collected on filter paper, and the weight after drying was weighed to determine the suspended particulate matter concentration (mg/L) per liter of each sample.

From Table 1, by the portable wastewater treatment evaluation pretreatment device according to the present invention, (1) by subjecting the wastewater flowing in from the inlet Din to flocculation treatment in the flocculation tank 11, (2) the flocculation tank 11 (3) drainage near the water surface of the storage chamber 15; 4) It was confirmed that the absorbance and the amount of suspended particulate matter of the wastewater flowing out from the outlet Din were reduced.
For this reason, according to the portable pretreatment apparatus for evaluating wastewater treatment according to the present invention, the flocculation treatment (pretreatment) can be performed simply and quickly while suppressing the formation of a deposit layer on the tank wall of the flocculation tank 11. , the wastewater treatment conditions can be evaluated.

(Example 2)
A portable wastewater treatment evaluation apparatus was constructed by combining a portable activated sludge treatment tank 20 as shown in FIG.
As shown in FIG. 8, the portable activated sludge treatment tank 20 used in this example has an internal volume of 5 L and has a box-like internal shape measuring 23 cm long, 15 cm wide and 30 cm high. It has a discharge pipe t (inner diameter 20 mm) for discharging the activated sludge treated water treated in the sludge treatment tank 20 .
The portable activated sludge treatment tank 20 is composed of a transparent resin plate having a thickness of 4 to 6 mm and is easily visible from the outside.
In the portable wastewater treatment evaluation apparatus 10, the wastewater discharged from the oil refining facility is flowed into the flocculation tank 11 from the inlet Din at a speed of 20 ml/min, and the stirring propeller 12 is rotated at 1 to 10 rpm in the flocculation tank 11. While rotating at , aluminum sulfate was added as a flocculating agent to flocculate and precipitate the flocculate. The aggregate-treated water obtained by the aggregation treatment is made to flow into the storage chamber 15 through the through hole P, and the aggregate-treated water stored in the storage chamber 15 is discharged from the outlet Dout of the discharge pipe T at a rate of 15 ml/minute. Then, after the activated sludge treatment in the portable activated sludge treatment tank 20, the resulting treated water was allowed to flow out from the discharge pipe t at a rate of 15 ml/minute.
The above treatment was carried out continuously for 5 days, and (1) wastewater flowing in from the inlet Din and (2) wastewater flowing out from the discharge pipe t of the portable activated sludge treatment tank were sampled every day. , by the following methods: (1) ammonia nitrogen concentration (mg N / L) per liter of wastewater flowing in from the inlet Din and (2) nitrate nitrogen concentration per liter of wastewater flowing out from the discharge pipe t of the portable activated sludge treatment tank The nitrogen concentration (mg N/L) was measured for each, and the nitrification rate (%) (the rate at which ammonia in the waste water is oxidized to nitric acid) was calculated.
Table 2 shows the results.

<Method for measuring ammonia nitrogen concentration and nitrate nitrogen concentration in wastewater>
Each was measured by ion chromatography.

<Nitrification rate>
{(2) Concentration of nitrate nitrogen in the wastewater flowing out from the discharge pipe t of the portable activated sludge treatment tank/(1) Concentration of ammonia nitrogen in the wastewater flowing in from the inflow port Din}×100

(Reference Example 1) When the wastewater treatment corresponding to Example 2 was performed in an actual machine (actual wastewater treatment plant) in which wastewater was treated under the conditions corresponding to this example, the average value of the nitrification rate for 5 days was calculated. It was found to be 97% by mass.

(Comparative Example 1) Wastewater treatment was carried out in the same manner as in Example 2, except that the portable activated sludge treatment tank 20 alone was used instead of the portable wastewater treatment evaluation pretreatment device 10 as the pretreatment device. and the average nitrification rate over 5 days was found to be 92% by mass.

Table 3 shows the average value of the nitrification rate for 5 days in Example 2, Reference Example 1 and Comparative Example 1 above.

From Tables 2 and 3, the nitrification rate of Example 2 using the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention is the same as that of the corresponding wastewater treatment in the actual equipment (actual wastewater treatment plant). It can be seen that the results are consistent with the rate.
On the other hand, from Tables 2 and 3, it can be seen that in Comparative Example 1, since the portable pretreatment apparatus for wastewater treatment evaluation according to the present invention was not used, the nitrification rate was lowered.

According to the present invention, it is possible to provide a portable pretreatment apparatus for wastewater treatment evaluation and a wastewater treatment evaluation method for simply and quickly evaluating wastewater treatment conditions while suppressing the formation of a deposit layer on a wall.

REFERENCE SIGNS LIST 10 Portable wastewater treatment evaluation pretreatment device 11 Aggregation tank 12 Stirring blade 13 Support rod 14 Vertical position moving means 15 Storage chamber 16 Rotating device 20 Portable activated sludge treatment tank Din Inlet Dout Outlet N Inflow nozzle WS Water surface B Bottom T, t Exhaust pipe R Widened part

Claims (5)

A pretreatment device for portable wastewater treatment evaluation,
a flocculation tank with an internal volume of 3 to 12 L into which organic matter-containing wastewater to be treated by the activated sludge treatment equipment is introduced and separated into flocculate and flocculate-treated water;
a stirring blade provided with a widened portion made of a flexible resin on at least a part of an outer edge portion in the tank of the aggregation tank;
A vertical position moving means capable of adjusting the position of the stirring blade in the vertical direction of the aggregation tank,
A portable pretreatment apparatus for evaluation of waste water treatment, wherein the widened portion of the stirring blade is arranged so as to come into contact with the inner wall of the coagulation tank when the stirring blade rotates. 2. The portable wastewater treatment evaluation method according to claim 1, wherein the organic matter-containing wastewater treated by the activated sludge treatment device is one or more selected from industrial wastewater and domestic wastewater containing organic matter treated by the activated sludge treatment device. Pretreatment device. 3. The portable pretreatment apparatus for evaluating wastewater treatment according to claim 1, wherein said stirring blade is a stirring propeller. further comprising a storage chamber communicating with the aggregation tank and storing the aggregate-treated water treated in the aggregation tank, and having a discharge pipe for discharging the aggregate-treated water stored in the storage chamber,
4. The water intake port of the discharge pipe according to any one of claims 1 to 3, wherein the water intake port is drawn into the storage chamber and arranged so as to be vertically movable so as to be positioned near the water surface of the stored aggregate-treated water. Pretreatment equipment for portable wastewater treatment evaluation. A method for evaluating wastewater treatment , which comprises treating organic matter-containing wastewater treated by an activated sludge treatment apparatus using the portable pretreatment apparatus for evaluating wastewater treatment according to any one of claims 1 to 4 .