JP2012035173A - Water purification apparatus and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power and equipment cost required for purification treatment and reduce treatment cost by performing the agitation and mixing of a flocculant and water of a pond or canal using energy of a water flow delivered by a pump when purifying the water using a simple-structured water purification tank disposed in the water, and performing the separation and removal of flocculates using a very simple filter.SOLUTION: A water purification apparatus comprises the water purification tank which is installed in the water and provided with a flocculation reaction portion and a flocculation and sedimentation portion and in which water flows from the flocculation reaction portion to the flocculation and sedimentation portion, a flocculant agitating and mixing device which agitates and mixes the flocculant whose main component is polyglutamic acid or crosslinked polyglutamic acid into the water of the flocculation reaction portion, and the filter which comprises mesh thin plates made of a hydrophobic synthetic resin and is disposed in the flocculation and sedimentation portion. The flocculates of contaminants which are flocculated by the agitation and mixing of the flocculant and float in the water are fixed to the outer surface of the filter.

Description

  The present invention relates to an improvement of a treatment apparatus and a treatment method for purifying water such as ponds, rivers, rivers, and lakes using a flocculant containing polyglutamic acid or a polyglutamic acid cross-linked product as a main component. The processing equipment has a simple structure and is easy to assemble and install. The coagulant can be agitated and mixed into water with low power consumption, and pollutants can be agglomerated and separated and recovered with high efficiency. The present invention relates to a water purification treatment apparatus and a purification treatment method that can significantly reduce the manufacturing cost and purification treatment cost of the treatment apparatus.

  In recent years, there has been a strong demand for recovery of the water environment. In particular, purification of water in gardens, park ponds, castles, old burial mounds, and small rivers in urban areas has become an urgent issue. Therefore, various water purification treatment technologies have been developed, and in particular, biodegradable flocculants that have no toxicity and do not cause environmental pollution to the natural world, such as flocculants mainly composed of cross-linked polyglutamic acid were used. Purification technology has gained widespread attention.

  The present inventors have previously developed a biodegradable flocculant (trade name PGα21Ca manufactured by Nippon Polyglu Co., Ltd.) mainly composed of the above-mentioned crosslinked polyglutamic acid, and water in rivers, ponds, bays and the like using the same. A purification treatment technology has been developed and disclosed (Patent No. 4365190, Patent No. 438154, Patent No. 4490795, etc.).

That is, in the technologies such as the above-mentioned Patent Nos. 4381154 and 4490795, a predetermined amount of the flocculant or the flocculant mixed water is supplied to the water in the treated area by using the flocculant supply device mounted on the ship or the dredger. Sprinkling or injecting into the inside, and using the rotational force of the ship's screw or the injection pressure of the flocculant mixed water, the flocculant and the water in the treated area are forcibly stirred and mixed to coagulate and precipitate the pollutants. I am doing so.
In addition, the aggregates of pollutants floating in the water are adsorbed and recovered on the surface of the recovery body by pulling the recovery body formed by combining thin plate materials in a lattice shape with a ship or the like.

  However, in each purification treatment method in which the flocculant is simultaneously sprayed over the entire surface of the wide treated water area as described above, and simultaneously stirred and mixed into the water, (1) recovery of the aggregated and precipitated aggregates is achieved. If it is not easy, (2) aggregated sediment will accumulate on the bottom of ponds and rivers, and undecomposed matter will easily become sludge. (3) Contaminant if the aggregating agent supplied into water and water are not sufficiently stirred and mixed However, the aggregates once aggregated and settled easily dissociate and easily re-float. (4) The equipment costs required for water purification treatment increase, making it difficult to reduce the purification treatment costs. There is a problem.

  On the other hand, in order to avoid the problems (1) to (4) above, the flocculation reaction tank A and the flocculation sedimentation are carried out in the water of the pond in park ponds and reeds having a relatively small water area as shown in FIGS. A purification treatment tank Ao composed of a tank B and a discharge tank C is arranged, and a water flow is generated by the pump P and a coagulant is supplied from the coagulant supply device D into the coagulation reaction tank A. Thus, the water is made to flow in a zigzag shape in the direction of the arrow, while the flocculant supplied from the supply device D is stirred and mixed into the water.

  Since the water purification method shown in FIGS. 5 and 10 is forcibly circulating the water in the pond using the water flow by the pump P, several days are required to treat all the water in the pond. However, the purification tank can be easily assembled and installed with a synthetic resin plate or the like, or it can be disassembled and removed, so that the water purification treatment amount can be greatly reduced. ing.

  However, in the agglomeration reaction tank A of the water purification treatment apparatus shown in FIG. 9 and FIG. 10, the water is only flowed in the zigzag direction toward the discharge tank C by the pump P. The flocculant (or the liquid mixture of flocculant and water) supplied into the inside is not sufficiently stirred and mixed with water, resulting in a decrease in the utilization rate of the flocculant and a decrease in the amount of aggregated sediment of the pollutant. There is a problem that the purification performance is low.

  In addition, since the aggregate is separated from the water using so-called gravity precipitation, the efficiency of collecting and removing the aggregate is extremely low. As a result, there is a problem that the aggregate is discharged again into the pond.

  Further, since the pump P causes the water to flow in a zigzag shape, the power required to flow the water at a predetermined flow rate increases, which leads to an increase in the amount of pump power and thus an increase in the purification processing cost. There are difficulties.

JP 2005-144340 A Japanese Patent No. 4381544 Japanese Patent No. 4490795

  The present invention has the above-described problems in the system in which the water purification treatment apparatus Ao is installed inside the pond as shown in FIG. 9 to perform the water purification treatment, namely, (1) aggregation. Since the sediment separation performance of the product is extremely low, the aggregate is easy to be discharged into the pond together with the purified water, (2) the stirring and mixing ability of the flocculant in the aggregation reaction tank A is low, and (3) the water is circulated It is intended to solve the problems such as the amount of pump power and the cost of pump equipment required to make it difficult to reduce the cost of water purification treatment, and it is possible to enter the agglomeration reaction tank with one pump. The flocculant can be supplied and the flocculant can be completely stirred and mixed in the agglomeration reaction tank, and a filter made of a mesh-like thin plate material is provided to adsorb and separate the agglomerates. And significant reduction in equipment costs and coagulated sediment Aims to improve the recovery efficiency, thereby is to St. provides the possibility and the purification treatment apparatus and cleaning method of treating water such as ponds to lower the water purification treatment costs.

  A water purification treatment apparatus according to the present invention is a water purification treatment tank installed in water, and includes a coagulation reaction part and an aggregation precipitation part, and water flows inside the aggregation reaction part toward the aggregation precipitation part. A water purification treatment tank, a flocculant stirring and mixing device for stirring and mixing a flocculant mainly composed of polyglutamic acid or a polyglutamic acid cross-linked product into the water of the agglomeration reaction part, and a hydrophobic substance disposed in the agglomeration precipitation part The basic structure of the present invention is to fix agglomerated contaminants, which are composed of a synthetic resin mesh thin plate and agglomerated by agitation and mixing of a flocculant, to the outer surface of the filter.

  The flocculant stirring and mixing device is annularly arranged in the water of the agglomeration reaction part, and has a small-diameter jet on both side walls in a direction horizontal to the axis and an upper wall in a direction perpendicular to the axis in a longitudinal sectional view. Water flows into the interior of the water conduit formed by opening the outlet at a desired interval in the lengthwise direction, and through water holes provided in the water and provided in the side wall, and the flocculant is introduced from the upper opening. The liquid mixture forming tank and the liquid mixture inside the liquid mixture forming tank are pumped to the inlet side of the water conduit and the liquid mixture of the flocculant and water is jetted from the jet nozzle into the coagulation reaction section. It is desirable to comprise a submersible pump.

  In addition, it is desirable to cause the water in the water purification treatment tank to flow by a water flow generator provided outside the water purification treatment tank or by using a water flow such as a river. Furthermore, the water in the water purification treatment tank may be caused to flow by the submersible pump of the flocculant stirring and mixing device.

  The filter is formed by arranging hydrophobic synthetic resin mesh thin plates in parallel at a predetermined interval, or folding a rectangular continuous long hydrophobic synthetic resin mesh thin plate in a folding screen. Filter.

  The water purification treatment tank may be formed of wood, a synthetic resin material, wood or a synthetic resin material, and a part of a bank.

  It is desirable that the water conduit is a hose made of synthetic resin or cloth, and is arranged in a plurality of stages horizontally at a height of about 1/4 to 3/4 of the water level from the bottom of the aggregation reaction part.

  The flocculant is preferably a biodegradable powder flocculant or a liquid flocculant mainly composed of a crosslinked polyglutamic acid. Further, it is desirable that the water conduit be an annular water conduit that is disposed in the agglomeration reaction portion at a predetermined distance from the side wall thereof and has a square shape, a polygonal shape, or a circular shape in plan view.

  In the water purification method according to the present invention, the flocculant is stirred and mixed into the water of the agglomeration reaction part of the water purification treatment tank, and a filter made of a hydrophobic synthetic resin mesh thin plate is installed in the agglomeration precipitation part. The basic constitution of the present invention is to fix agglomerates of pollutants that are agglomerated and suspended in water to the outer surface of the filter by stirring and mixing the aggregating agent to prevent the agglomerates from flowing out to the downstream side. is there.

  The water to be treated of the present invention is pond, river, marsh lake water, harbor salt water, etc., and the flocculant used is preferably a flocculant mainly composed of cross-linked polyglutamic acid. is there.

  The hydrophobic synthetic resin mesh thin plate forming the filter is a long square synthetic resin mesh thin plate, and the long square synthetic resin mesh thin plate is spaced at a certain interval. It is desirable to form the filter by disposing it inside the agglomerated sedimentation portion in a continuously folded form.

  In addition, the hydrophobic synthetic resin mesh thin plate forming the filter is disposed in the coagulating sedimentation portion in a state of maintaining a desired inclination angle with respect to the water flow direction in a plan view. It is desirable to generate a water flow in a direction parallel to the surface.

  Further, the filter is formed by forming a hydrophobic synthetic resin mesh thin plate into a folding screen-like foldable form, and developing the filter by unfolding the mesh thin plate folded inside the coagulating sedimentation tank, and removing it. Sometimes it is desirable to fold it out.

  The water purification treatment apparatus according to the present invention comprises a water purification treatment tank having an agglomeration reaction part and an aggregation precipitation part formed of a synthetic resin material and the like, and polyglutamic acid or polyglutamic acid cross-linked product into the water of the aggregation reaction part. It comprises a flocculant stirring and mixing device that stirs and mixes the flocculant as a main component, and a filter made of a hydrophobic synthetic resin mesh thin plate disposed in the aggregation and precipitation portion. Therefore, the structure of the water purification treatment apparatus itself is simplified, and only one submersible pump is necessary for water treatment in a pond or the like, and the manufacturing cost of the apparatus and the water purification treatment cost are greatly reduced. Is possible.

  In addition, a biodegradable flocculant mainly composed of a polyglutamic acid cross-linked product is used as the flocculant, and the flocculant is separated using a filter made of a hydrophobic synthetic resin mesh thin plate in the flocculent sedimentation portion of the water purification treatment tank. Since it is configured to fix and recover, the pollutant can be efficiently aggregated and the aggregate itself can be recovered extremely efficiently.

  In addition, a filter made of a hydrophobic synthetic resin mesh thin plate is provided in the coagulation sedimentation portion while maintaining a predetermined inclination angle with respect to the water flow, so that it flows along the outer surface of the filter in parallel therewith. A water flow is generated, and the generated water flow causes the agglomerates adsorbed on the filter to be sequentially pushed toward one side of the downstream side, and finally collected at the bottom of the aggregation precipitation portion. As a result, clogging of the filter is not only effectively prevented, but agglomerates can be discharged out of the tank very easily.

  In addition, the filter is formed by continuously folding a long rectangular synthetic resin mesh sheet in a folding screen, making it easy to install and remove the filter after use. Costs can be significantly reduced.

  Further, in the present invention, the flocculant is introduced into the agglomeration reaction part of the water purification treatment tank from the annular water guide pipe provided in the water, in both longitudinal directions and shafts parallel to the axis of the water guide pipe in the longitudinal sectional view. Since each of them is ejected in the upward direction perpendicular to the heart, a vertical circulation flow is generated inside the agglomeration reaction part, and the ejected aggregating agent is stirred and mixed into water extremely efficiently. Will be. As a result, stirring and mixing of the flocculant and supply and delivery of water to be processed can be performed with less power, and the water purification processing cost can be greatly reduced.

It is a top view which shows the use condition of the water purification processing apparatus which concerns on 1st Embodiment of this invention. It is a top view of the purification treatment apparatus of water concerning a 1st embodiment. It is a longitudinal cross-sectional view of the water purification processing apparatus which concerns on 1st Embodiment. It is a top view which shows the 2nd example of arrangement | positioning of the filter in an aggregation precipitation part. It is a top view which shows the 3rd example of arrangement | positioning of the filter in an aggregation precipitation part. It is a top view which shows the 4th example of arrangement | positioning of the filter in an aggregation precipitation part. It is sectional drawing of the water conduit which forms a flocculent stirring mixing apparatus. It is a top view which shows the use condition of the water purification processing apparatus which concerns on 2nd Embodiment of this invention. It is a top view which shows the use condition of the conventional water purification processing apparatus. It is a perspective view which shows the outline | summary of the conventional water purification processing apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a usage state of the water purification treatment apparatus according to the first embodiment of the present invention, FIG. 2 is a plan view of the water purification treatment apparatus according to the first embodiment, and FIG. It is a longitudinal cross-sectional schematic diagram of the water purification processing apparatus which concerns on 1st Embodiment.
1 to 3, 1 is a pond, 1a is a water inlet, 1b is a water outlet, 2 is a water purification treatment apparatus, 3 is a water purification treatment tank, 3a is a flocculant reaction section, 3b Is a coagulating sedimentation section, 3c is a discharge section, 3e is a partition wall, 4 is a mixed liquid forming tank, 5 is a water conduit, 6 is a submersible pump, 7 is a coagulant supply mechanism, 8 is a coagulant stirring and mixing device, and F is a filter. , G is a mass of agglomerates, W is the main water stream, and M is a water stream in a direction along the outer surface of the filter.

  That is, the water purification treatment apparatus 2 is composed of a water purification treatment tank 3, a flocculant stirring and mixing apparatus, and a filter F, and the flocculant stirring and mixing apparatus is connected to the liquid mixture forming tank 4 and the lead. A water pipe 5, a submersible pump 6 and a flocculant supply mechanism 7 are formed. Further, the water purification treatment tank 3 is provided with an aggregation reaction part 3a, an aggregation precipitation part 3b, and a discharge part 3c in order from the upstream side.

The water purification treatment tank 3 is formed in a rectangular shape using a wood plate, a synthetic resin plate, a synthetic resin sheet material, and the like, and a partition plate 3e having a height about 0.5 times the side wall height is provided therein. By providing, the aggregation reaction part 3a and the aggregation precipitation part 3b are formed.
Further, the water purification treatment tank 3 is disposed and fixed to the bottom of the pond or the like by using an appropriate method, for example, a support pile or a weight, with the upper end of the side wall slightly protruding above the water surface of the pond. And is not moved by water flow.

The filter is made of a synthetic resin mesh thin film plate. In this embodiment, a hydrophobic continuous thin film plate made of polyethylene or polypropylene is used. That is, the mesh thin film plate made of synthetic resin is made of the same material as a general household drainage net (stocking type drainage fitnet manufactured by Ohe Co., Ltd.), and is made of polyethylene fibers having a diameter of 0.05 to 0.1 mm. Finely knitted and finished into a thin and stretchable net, 100mm x 150mm (average pore diameter 0.1 to 0.5mm) when there is no tension, but 220mm x 300mm (average pore diameter) when stretched 0.2 to 1.0 mm). The synthetic resin mesh thin film plate is formed into a continuous thin film plate having a height of about 1000 mm and a thickness of about 0.2 to 0.4 mm.
The filter is not limited to the same material as the draining net, but may be a porous thin film plate (thickness 2 to 3 mm) that is substantially the same as a filter of a general household kitchen fan. Of course, as shown in FIGS. 2 and 3, the water purification treatment tank 3 is arranged in a zigzag manner in the coagulation sedimentation portion 3 b with a direction of the main water flow W and an inclination angle of 10 to 30 degrees.

A core material 9 is provided on the upper side and the lower side of the synthetic resin mesh thin film plate forming the filter, and the synthetic resin mesh thin film plate is firmly held in water by the core material 9.
In addition, a fixing column 10 is provided at a bent portion (folded portion) of the synthetic resin mesh thin film plate, and the resin mesh thin film plate is fixed and held by the column 10 with appropriate tension applied thereto. ing.

In the embodiment shown in FIGS. 1 to 3, the longitudinal dimension of the water purification treatment tank 3 is selected to be about 15 m, the width dimension is about 1.8 m, and the height dimension is about 1 m. Of course, the outer dimensions and the like of 3 are appropriately changed depending on the form of the pond or the tub to be purified.
Further, in the embodiment of FIGS. 1 to 3, the inside of the water purification treatment tank 3 is divided into three to form an agglomeration reaction part 3a, an agglomeration precipitation part 3b and a discharge part 3c having a volume approximately twice that of the agglomeration reaction part 3a. Of course, the volume ratio of each part 3a, 3b, 3c can be changed as appropriate.

  1 to 3, the rectangular parallelepiped water purification treatment tank 3 is submerged in water. However, as shown by the dotted line in FIG. You may make it form the side wall part of the purification treatment tank 3, and may form the bottom face with a waterproof sheet.

  The liquid mixture forming tank 4 constituting a part of the flocculant stirring and mixing device is formed as an upwardly open rectangular tank having a double wall structure, and a large number of double side wall surfaces forming the tank 4 are provided on the double side wall surface. The water passage hole is provided and functions as a so-called strainer. Moreover, the said liquid mixture formation tank 4 is installed in water close to the said water purification treatment tank 3, and the submersible pump 6 is installed in the inside.

A flocculant supply mechanism 7 is provided above the liquid mixture forming tank 4, and a flocculant 7 a containing a predetermined amount of polyglutamic acid or a polyglutamic acid cross-linked product as a main component is sequentially passed through the flocculant supply mechanism 7. It is supplied into the mixed liquid forming tank 4.
The flocculant supply mechanism 7 may have any configuration as long as it can accurately supply a predetermined amount of powder or liquid flocculant into the formation tank 4. In the present embodiment, a supply mechanism 7 having a structure in which a powdery flocculant is quantitatively released by rotation of a small scraping blade (not shown) is used.

The flocculant 7a mainly composed of the polyglutamic acid or the polyglutamic acid cross-linked product is a powdery flocculant. In the present embodiment, the following amount of ingredients (wt%) is used as the powdery flocculant. The flocculant 7a (product name PGα21Ca, manufactured by Japan Polyglu Co., Ltd.) is used.
Composition of ingredients (wt%)
PGα21Ca = 14%, C = 0.5%, O = 45%, Na = 8%, Al = 0.5%, Si = 12%, Cl = 0.4, Ca = 15%, K = 0.1 %, Fe = 15%

The PGα21Ca is a novel naturally degradable substance mainly composed of biodegradable γ = polyglutamic acid, and is represented by the following structural formula.

Further, O, Ca, Fe, Si, etc. in the flocculant 7a are usually 2CaSO ₄ · H ₂ O, NaCO ₃ · H ₂ O, NaSO ₄ , MgSO ₄ · 6H ₂ O, Al ₂ (SO ₄ ) · 18H _2. A substance type represented by a chemical structural formula such as O is contained in the flocculant 7a.

  The water guide pipe 5 is a pipe for introducing the liquid mixture Wa of the coagulant 7a and water W fed from the submersible pump 6 into the coagulation reaction part 3a, and has a ring shape in the water of the coagulation reaction part 3a. Is arranged. That is, the water guide pipe 5 is formed of a cloth hose or a synthetic resin pipe of about 25A to 100A (50A in the present embodiment), the front end thereof is closed, and the base end portion is connected to the submersible pump 6.

The water conduit 5 is formed in a circular shape such as a circle, a quadrangle, or a polygon in plan view, and is disposed at an interval of about 30 to 100 cm from each side wall of the agglomeration reaction tank 3a.
Further, the water guide pipe 5 is in a range of ¼ to ¾ of the height of the agglomeration reaction part 3a (distance between the bottom surface and the water level WL), that is, 25 cm from the bottom surface when the water level height is about 1 m. It is disposed and fixed in a substantially horizontal state within a range of 75 cm in height.

  Further, as shown in FIG. 7, three outlet holes 5a having appropriate outer diameters are formed on the pipe wall of the water guide pipe 5 on both sides of the hose axis φ and the horizontal direction and on the upper side in the vertical direction of the axis φ. Are formed, and the interval between the ejection holes 5a in the longitudinal direction of the hose is selected to be 10 to 30 cm. In this embodiment, the annular water conduit 5 is provided in one horizontal stage, but the annular water conduit 5 may be provided in two or three stages.

  FIG. 4 shows a second example of the arrangement of the filters in the coagulating sedimentation portion 3b, in which continuous synthetic resin mesh thin film plates are bent and arranged at a predetermined interval at a right angle. . In this case, as will be described later, the agglomerates fixed to the outer surface of the filter cannot be automatically gathered to one side of the water purification treatment tank, but the agglomerates can be adsorbed and recovered more reliably. I can do it.

  FIG. 5 shows a third example of the arrangement of the filters in the coagulation / sedimentation part 3b. Instead of the continuous synthetic resin mesh thin film plate, the filter cut to a predetermined size is placed at a predetermined interval. It is arranged in 3b. In the case of the third example, it is desirable that the filter has a structure in which so-called synthetic resin mesh thin film plates are attached to both sides of the frame so that the filter can be back-washed.

  FIG. 6 shows a fourth example of the arrangement of the filters in the coagulating sedimentation portion 3b, in which a continuous synthetic resin mesh thin film plate is previously folded in a folding screen, and then folded in a folding screen. A synthetic resin mesh thin film plate is carried into the sedimentation aggregation portion 3B and developed here to place a filter.

  With reference to FIG. 1 thru | or FIG. 3, in the purification process of water, such as a pond, first, the water purification process tank 3 equipped with the filter, the liquid mixture formation tank 4 which comprises the flocculant stirring mixing apparatus, the water conduit 5, The submersible pump 6 and the like are disposed in the water W. Further, the flocculant supply mechanism 7 is filled with a predetermined amount of the flocculant 7a. Furthermore, the necessary chemicals from the concentration of the flocculant in the water W to be treated (usually set to 100 ppm), the amount of treated water (water area x water depth), one day operation time and purification treatment period (days), pump capacity (flow rate), etc. Determine the amount and flocculant charge.

  Next, the submersible pump 6 is operated, and a predetermined amount of the flocculant 7 a is charged into the mixed liquid formation tank 4. The water that has flowed into the mixed liquid forming tank 4 and the charged flocculant 7a are agitated and mixed by being sucked into the submersible pump 6, and the mixed liquid Wa containing both flocculants of a predetermined concentration is the water guide pipe. 5 from each of the ejection holes 5a into the water in the agglomeration reaction tank 3a.

  Since each ejection hole 5a formed in the water guide pipe 5 is arranged as shown in FIG. 7, the pumped mixed liquid flows horizontally toward the side wall of the agglomeration reaction part 3a and toward the center. 3 is formed in the agglomeration reaction portion 3a in combination with the fact that the water flow pipe 5 is ejected as an upward vertical flow and the water guide pipe 5 has an annular shape. A complicated turbulent flow is generated near the side wall of the agglomeration reaction part 3a.

  As a result, the water W and the flocculant 7a are sufficiently stirred and mixed in the agglomeration reaction part 3a without using a special stirring device or the like, and the aggregating action of the pollutant in the water W is promoted. Is done.

The water agitated and mixed with the flocculant in the agglomeration reaction part 3a overflows the partition plate 3e, flows into the agglomeration sedimentation part 3b, passes through the filter, and thereby agglomerates mainly composed of contaminants floating in the water. Objects are adsorbed and removed by the filter. Further, the purified water from which the aggregates have been removed is returned to the pond 1 through the discharge part 3c.
In addition, agglomerates of pollutants in the water W formed by stirring and mixing the flocculant 7a are adsorbed on the outer surface of the filter, and a water flow M in a direction along the outer surface of the filter is generated. Therefore, the water M is sequentially pushed toward one side of the water purification treatment layer 3, and the size (diameter) of the lump G gradually increases and gathers in the vicinity of the side wall of the water purification treatment tank. Note that the water flow M in the direction along the outer surface of the filter is generated when the filter is arranged with a constant inclination angle with respect to the main water flow W. It has been confirmed through water purification tests that 30 degrees is optimal.
Further, the aggregate G separated by the filter in the coagulation sedimentation portion 3b and accumulated from the side wall of the coagulation sedimentation portion 3b is appropriately sucked and discharged from the sedimentation portion 3b by a vacuum pump or the like.

  The water treatment speed is usually selected to be about 150 l / min to 1000 l / min depending on the pump capacity to be used. Based on this, the capacity of the water purification treatment device 3, the purification treatment time, the amount of flocculant added, etc. What is determined is as described above.

A purification process was carried out on the water of a pond having a water area of 1000 m ² , a water depth of 1 m, a total water storage volume of 1000 tons, and the main causes of pollution being blue water and sludge.

The used water purification treatment tank 3 has a length of 15 m, a width of 1.8 m, and a depth of 1 m, and the length of the coagulation reaction part 3a is 2.5 m (the length of the coagulation sedimentation part 3B and the discharge part 3c is 12.5 m. ). The submersible pump 6 is a submersible pump having a discharge flow rate of about 200 to 250 l / min, a discharge pressure of 1.2 to 1.5 kg / cm ^{2, and a} working voltage of AC 100V.
Further, a rubberized cloth hose (50 mm) was used for the water guide pipe 5, and the inner diameter of the ejection holes 7 a was 1.5 to 2.5 mφ, the pitch of the ejection holes was 10 to 15 cm, and the hose length was 16 m.

  Seven rows of continuous mesh thin film plates are arranged in an area of 5 m in the longitudinal direction of the coagulating sedimentation portion 3b with an inclination angle α of 10 degrees (the amount of mesh thin film plates used is 1.83 m × 7 = 12.81 m). Thus, a filter was formed. The height dimension of the filter is about 1 m.

The amount of flocculant 7a to be charged is that the specified concentration of flocculant 7a is charged to the total amount of water, and water 1000 tons × concentration 100 ppm = 100 kg of flocculant (PGα21Ca) is charged.
In addition, the flocculant charging time (that is, the purification treatment time) is 10 hours a day, and the total amount of flocculant is charged in 7 days. As a result, the water treatment flow rate is 238 l / min. The amount of the added agent was 23.8 g / min, and the amount of the added flocculant per day was 14.3 kg.

  In the water purification treatment, the flocculant charged reacts sufficiently and the time required to pass through the reaction tank 3a is 238 l / min of water for 4.5 tons of the reaction tank. Met. Furthermore, the time required for water to pass through the 22.5 ton water purification treatment tank 3 was about 95 minutes. The treated water that has passed through the reaction unit 3a is subjected to solid-liquid separation by a filter in the precipitation condensing unit 3b, and only the supernatant fresh water is returned to the pond again.

The table below shows the results of purification treatment in this example.

  FIG. 8 is a plan view showing a specification state of the water purification treatment apparatus according to the second embodiment of the present invention. In the second embodiment, a reversal wall 11 is provided in the agglomeration reaction unit 3a, and water is forcibly circulated by a water flow generator (submersible pump) 12 provided in water outside the water purification treatment tank 3 to form a meandering flow. Therefore, the flocculant is stirred and mixed. In addition, since it is the structure same as the case of the said 1st Embodiment except the structure of this flocculent stirring mixing apparatus, the description is abbreviate | omitted here.

The continuous synthetic resin mesh thin film plate used in the present invention is equivalent to a general-purpose filter used for ordinary household use, and compared to the filter used in the conventional water purification treatment apparatus, It can be manufactured at low cost. In addition, when the filter is replaced, the water is almost completely separated when the filter is pulled up from the water, so that the subsequent cleaning operation becomes extremely easy. Furthermore, when discarding, moisture is easily removed by the capillary phenomenon of the mesh thin film plate made of synthetic resin, and the filter is easily transported and disposed.
In addition, the synthetic resin mesh thin film plate loses its filter effect sequentially from the upstream side, and if the synthetic resin mesh thin film plate located on the most downstream side loses the filter effect, all the synthetic resin mesh thin film plates are replaced. Replace at once. Therefore, the work required for filter replacement can be performed efficiently, and the installation of the synthetic resin mesh thin film plate on the coagulation sedimentation part 3b can be performed without the need for any special equipment or instruments. It can be easily applied to the water purification treatment tank 3 having a different form.
Filter replacement costs can be greatly reduced.

  In the arrangement of the filter so that the water flow M is generated in the direction along the outer surface of the mesh thin film plate made of synthetic resin, the agglomerates caught around the micropores inside the thin film plate have a large outer diameter. Since it is separated and removed by the water flow M in the direction along the outer surface, the entire surface of the filter is never clogged at a time. As a result, efficient water purification treatment becomes possible.

  The present invention can be applied not only to purification of ponds and corals, but also to purification of sea salt water, water from rivers, marshes, and the like, and water in water tanks.

W is the main stream or water Wa is the mixture
WL is water level C is circulating flow
M is the water flow along the outer surface of the filter
G is a lump of aggregate
F is a filter 1 is a pond 1a is a water inlet 1b is a water outlet 2 is a water purification treatment device 3 is a water purification treatment tank 3a is a flocculant reaction part 3b is a coagulation sedimentation part 3c is a discharge part 3e is a partition plate 4 is a liquid mixture forming tank 5, a water conduit 5 a, an ejection hole 6, an underwater pump 7, a flocculant supply mechanism 7 a is a polyglutamic acid or a polyglutamic acid cross-linked product. 10 is a fixing column 11, reversal wall 12 is a water flow generator

Claims (15)

  A water purification treatment tank installed in water, comprising a coagulation reaction part and an aggregation precipitation part, a water purification treatment tank in which water flows from the aggregation reaction part toward the aggregation precipitation part, and the aggregation reaction part A flocculant stirring and mixing device for stirring and mixing a flocculant mainly composed of polyglutamic acid or a crosslinked polyglutamic acid into water, and a filter made of a hydrophobic synthetic resin mesh thin plate disposed in the aggregation and precipitation portion An apparatus for purifying water, comprising: agglomerates of pollutants that are constituted and are agglomerated by stirring and mixing of a flocculant and float in water, and are fixed to the outer surface of the filter.   The flocculant stirring and mixing device is annularly arranged in the water of the agglomeration reaction section, and has a small-diameter jet on both side walls in the direction horizontal to the axis and the upper side wall in the direction perpendicular to the axis in the longitudinal sectional view. A water guide pipe drilled at a desired interval in the length direction, and a mixture in which water flows into the inside through a water passage hole provided in the side wall and provided in the side wall, and a flocculant is introduced from the upper opening A liquid forming tank, and a submerged water which is disposed in the liquid mixture forming tank and pumps the liquid mixture inside the tank to the inlet side of the water conduit and ejects the liquid mixture of the flocculant and water from the jet port into the coagulation reaction section. The water purification apparatus according to claim 1, comprising a pump.   The water purification treatment apparatus according to claim 1, wherein water in the water purification treatment tank is caused to flow by a water flow generator provided outside the water purification treatment tank.   The water purification treatment apparatus according to claim 2, wherein the water in the water purification treatment tank is caused to flow by a submersible pump of the coagulant stirring and mixing apparatus.   2. The water purification apparatus according to claim 1, wherein the filter is formed by arranging hydrophobic synthetic resin mesh thin plates in parallel at a predetermined interval.   2. The water purification apparatus according to claim 1, wherein the filter is formed by folding a rectangular continuous long hydrophobic synthetic resin mesh thin plate into a folding screen.   The water purification treatment apparatus according to claim 1, wherein the water purification treatment tank is formed of a wooden pile, a synthetic resin material, a solvent, or a synthetic resin material and a part of the embankment.   3. The water conduit according to claim 2, wherein the water guide pipe is a synthetic resin or cloth hose and is arranged in a plurality of stages horizontally at a height of about 1/4 to 3/4 of the water level from the bottom of the agglomeration reaction part. Water purification treatment equipment.   The water purification apparatus according to claim 1, wherein the flocculant is a biodegradable powder flocculant or a liquid flocculant mainly composed of a crosslinked polyglutamic acid.   The water conduit according to claim 2, wherein the water conduit is an annular conduit having a quadrangular shape, a polygonal shape, or a circular shape in a plan view, which is disposed inside the agglomeration reaction portion by a predetermined distance from the side wall thereof. Purification device.   A water purification treatment method using the water purification treatment tank according to claim 1, wherein a flocculant mainly composed of polyglutamic acid or a polyglutamic acid cross-linked product is stirred and mixed into water in the agglomeration reaction part, and agglomerated. A filter made of a hydrophobic synthetic resin mesh thin plate is installed in the sedimentation part, and agglomerates of pollutants that aggregate and float in water by agitation and mixing of the flocculant are fixed to the outer surface of the filter. Water purification method that prevents outflow to water.   12. The water purification treatment method according to claim 11, wherein the water to be treated is pond, river, marsh lake water or harbor salt water, and the flocculant is a flocculant mainly composed of cross-linked polyglutamic acid. Water purification treatment method.   The hydrophobic synthetic resin mesh sheet that forms the filter is a long rectangular synthetic resin mesh sheet, and the long rectangular synthetic resin mesh sheet is continuously spaced at regular intervals. The method for purifying water according to claim 11, wherein the water purification method is arranged inside the agglomerated sedimentation portion in a form that is folded back.   A hydrophobic synthetic resin mesh thin plate that forms a filter in the coagulated sedimentation portion is disposed in a state that maintains a desired inclination angle with respect to the direction of water flow in a plan view, and is disposed on the outer surface of the mesh thin plate. 14. The water purification method according to claim 13, wherein water flows in parallel directions are generated.   A thin sheet made of hydrophobic synthetic resin is formed into a folding screen, and the folded mesh sheet is expanded inside the coagulation sedimentation tank to create a filter. When removed, the sheet is folded and removed. 14. The water purification method according to claim 13, wherein the water is purified.

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