JP2009056346A - Polluted muddy water treatment system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium-sized polluted muddy water treatment system using a mixing hose. <P>SOLUTION: In the polluted muddy water treatment system for treating polluted muddy water with one or more solid-liquid separators containing a muddy water treatment agent and treating a mixture to be treated in a settling tank and, if necessary, in a purification tank to separate the mixture into a precipitate and purified water, the muddy water to be treated in the solid-liquid separators is subjected to coagulation reaction in mixing hoses or tubes, and the mixing hose or tube has a long length and is used in a zigzag state or in a wound state. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a treatment system for solid-liquid separation of contaminated mud water.

Conventionally, solid-liquid separation of polluted mud water such as dredged sediment mud water includes a centrifugal separator, a filter press, a dehydrator using a belt press, and the like. In recent years, there has been a method for separating solid and liquid using a water-infiltration agent, a neutralizing agent, and an organic polymer flocculant by the present inventor (Patent Document 1, Patent Document 2 and Patent Document 3). A method for treating dredged sediment mud water and a solid-liquid water separation device by combining a treating agent and a specific mixer have been developed (Patent Document 4).
Japanese Patent Publication 8-240 JP 7-11560 7-75720 JP 10-499

Conventional treatment methods using a centrifugal separator, dewatering equipment such as a filter press, etc., only squeeze out moisture from the bottom mud and reduce the water content even if a large amount of money is invested. Not done. Moreover, since the solidified state of sludge is not perfect, it is difficult to use it as landfill or embankment soil.
Moreover, in any of the methods for solid-liquid separation by adding the above-mentioned water-immobilizing agent, neutralizing agent, organic polymer flocculant, etc., the stirring and mixing is insufficient, so the solid-liquid separation is not sufficient, It took a long time, the bacteria and heavy metals were not sufficiently detoxified, and the odor was not sufficiently eliminated, and pollution problems such as environmental pollution were inevitable.
Therefore, the solid-liquid separation of dredged sediment muddy water in a short time efficiently and without environmental pollution, and the solid-liquid separation method and apparatus for obtaining the improved soil and separation water, the treatment method of the above-mentioned JP-A-10-499 and A device was developed. The present invention seeks further efficiency of the invention and develops a system for muddy water treatment.

As a result of intensive studies to solve the problem of efficiently treating sludge water, the present inventor treated the sludge muddy water with a solid-liquid separation device (spira mixer or line mixer), and the treated mixture was treated with a sedimentation tank and then with a septic tank. In a processing system that separates the sediment and purified water by treatment in a solid-liquid separation device, the solid mud in the medium or small scale system is subjected to an agglomeration reaction in a long mixing hose or tube. The present inventors have found that separation and coagulation sedimentation can be performed efficiently and reliably, and soil and water that can be effectively reused with improved soil quality can be obtained efficiently.
That is, the present invention (1) treats the contaminated mud water in one or more of the solid-liquid separators containing the mud treatment agent, treats the treated mixture in a septic tank as necessary, and separates the precipitate and purified water. In the sludge muddy water treatment system, the muddy water treatment system comprising the coagulation reaction of the muddy water treated in the solid-liquid separator in the mixing hose or tube,
(2) The solid-liquid separator is a mixer 21 composed of a cylindrical main body. The main body of the mixer has an inlet 22 for contaminated mud water and a discharge outlet 23 for the mixed treatment product, each consisting of a short tube narrower than the main body. The mixer 21 is provided with a chemical supply pipe 36 for introducing the muddy water treatment agent through the chemical injection port 28 at the introduction port, in the vicinity of the inlet and the outlet of the main body. A partition plate made of a flat plate is fixed to each of the four side surfaces in the vicinity of the outlet from the side surface toward the center, and is mixed in the middle portion of the partition plate made of the four flat plates in the vicinity of the inlet and the outlet. The center part of the circular section of the machine cylinder consists of what is fixed with a "<" shaped partition plate arranged so that its tip is directed toward the introduction port. Similar mixers adapted to introduce one or more of the drugs in response Solid-liquid separation apparatus for the treatment of polluted mud which comprises coupling the above, it is (1) pollution mud processing system according,
(3) The polluted mud water treatment system according to (2), wherein the cylindrical main body of the solid-liquid separation device has a diameter of the central enlarged portion twice that of the outlet and a length four times that of the outlet.
(4) The contaminated mud water treatment system according to (2) or (3), wherein the mixer main body is turned sideways.
(5) The polluted mud treatment system according to (1), wherein the mud treatment agent is selected from one or more of a flooding agent, a neutralizing agent and a flocculant.
(6) The polluted mud treatment agent according to (1), wherein the mixing hose or tube is long.
(7) The contaminated mud water treatment system according to (1) or (6), wherein the mixing hose or tube is folded in a zigzag shape or wound.
(8) The contaminated mud water treatment system according to (1), (6) or (7), wherein the mixing hose or tube has a length of 10 to 100 m,
(9) The solid-liquid separator is composed of a water-repellent agent-containing device (i), a neutralizer-containing device (ii) and / or a polymer flocculant-containing device (iii), and the reaction hose of the separator (i) or The contaminated mud water according to (1), (6), (7) or (8), wherein the tube is 20 m, the reaction hose or tube of the separation device (ii) is 30 m, and the reaction hose or tube of the separation device (iii) is 40 m. Processing system,
It is about.

  Contaminated water that is a pollution problem is continuously supplied to a baffle plate type spira or line mixer containing a water-repelling treatment agent, and the mixed and stirred processing mixture is introduced into a long mixing hose or tube, and the inside of the hose or tube (medium) By agglomerating the treatment mixture, the muddy water is quickly submerged, and the soil particles combine to form a mass of soil, resulting in modified soil and separated purified water. Further, in the present invention, a mixing hose or tube is used, and the hose or tube can be formed in a zigzag shape or a wound state. Therefore, it is possible to freely and easily create a small-sized device from a medium size.

Any known muddy water treatment agent used in the present invention can be used, and as a water proofing agent, an inorganic flocculant described in JP-B-8-240, for example, a divalent or trivalent iron salt, a trivalent iron salt, etc. It is an inorganic flocculant composed of a metal salt and an alkaline earth metal as main components and the inorganic salt dissolved in solvent water, or an inorganic flocculant composed of the flocculant added with diphosphorus pentoxide. Can do.
Examples of the divalent or trivalent iron salt include ferrous sulfate, ferric sulfate, and ferric chloride. Examples of the trivalent metal salt include aluminum sulfate [Al ₂ (SO ₄ ) ₃ ], aluminum sulfate. Potassium [AlK (SO ₄ ) ₃ ] and the like. Examples of alkaline earth metal salts include magnesium chloride (MgCl ₂ · 6H ₂ O), calcium chloride (CaCl ₂ · 2H ₂ O), and the like.
In the present invention an inorganic flocculant addition plus phosphorus pentoxide (P ₂ O ₅₎ in the inorganic flocculant.
The composition ratio of the inorganic flocculant component of the present invention is appropriately selected depending on the source of the sludge to be treated, that is, the component constituting the sludge, the particle size composition ratio, the moisture content, pH, temperature, etc. Can be 50-30% by weight of trivalent or trivalent iron salt, 45-30% by weight of trivalent metal salt, and 1.5-0.3% by weight of P ₂ O ₅ , thereby effectively treating can do.
Although the usage-amount of a water-filling agent is not specifically limited, It is 0.1 to 1% with respect to sediment mud water (water content 7-12%) 1, Preferably it is 0.2-0.5%.
In the treatment of polluted mud water such as dredged sediment of the present invention, after treatment with the above-mentioned inorganic flocculant, for example, the water flocculant, the inorganic flocculant increases the hydrogen ion concentration in the water and lowers the pH. When slowing the agglomeration reaction, treat with calcium hydroxide [Ca (OH) ₂ ], sodium hydroxide (NaOH), magnesium oxide (MgO), etc., which are neutralizing agents, to lower the hydrogen ion concentration and raise the pH. To facilitate the coagulation and condensation reaction. In addition, when the pH is increased by the water proofing agent, sulfuric acid, hydrochloric acid or the like which is an inorganic acid is used. The pH can be 5-9, preferably 5.8-8.6.
The polymer flocculant used in the present invention includes various polymer flocculants such as anion, nonion, and cation. For example, polyanamide (Himoloc SS500, OK107 (registered trademark) (Kyoritsu Organic Industrial Co., Ltd.) Company)], polyacrylamide-based (Himoloc SS200 (registered trademark) (Kyoritsu Organic Industrial Co., Ltd.)) for nonion, and polyacrylamide-based (Himoloc MP173, Q101, Q105 (registered trademark) (Kyoritsu Organic Industrial Co., Ltd.) for cations Company)] etc. are used.
This polymer aggregation can further promote the aggregation and coagulation reaction between the sludge particles. Sludges settle and rapidly form large flocs by synergistic action with the purification and separation treatment agent.
In the present invention, it is possible to use one or more of the above-mentioned dripping agent, neutralizing agent and polymer flocculant as a treating agent due to polluted mud water such as dredged sediment mud water. In some cases, various types of treatment agents are used, and first, the first stage is treated with the water-repelling agent, the second stage is treated with a neutralizing agent, and the third stage is treated with an organic polymer flocculant. . Processing is performed using a baffle plate type spiral or line mixer as the mixer. As a result, dredged sediment mud water and each treatment agent are mixed very effectively, and solid-liquid separation of the mud water is completely performed, so that the separated soil and separated water can be used effectively.

The drawings will be described.
FIG. 1 is a flow sheet of the polluted mud treatment system of the present invention.
Raw water (sewage) is passed through the dust remover (11) into the underground flow control basin (flow control tank) (2), sent to the raw water control tank (3) by the pump (P), and then solid-liquid separation and mixing by the pump Machine (spira mixer or line mixer) (20), (20 '), (20 "). These are sent to tanks (31) to (31") of water-proofing agent and neutralizer, respectively. The tanks (32) to (32 ') and the polymer flocculant tanks (33) to (33') are introduced with a water proofing agent, a neutralizing agent and a polymer flocculant. The processed product treated with the sprinkler-containing spira mixer 20 passes through the mixing hose (4), is introduced into the neutralizing agent-containing spira mixer 20 ', passes through the mixing hose (4'), and further contains a polymer flocculant-containing spira. The mixture is mixed by a mixer 20 ″ and sent to a settling tank (5) to (5 ″), and clean water is recovered and used. The sediment (floc) settled in the sedimentation tank (5-5 ″) is sent to the dehydrator (filter press) (6) by the sludge extraction pump (P), and the dehydrated sludge is solid storage boxes (7), (7 ') Shows the flow of the contaminated mud water treatment system consisting of the water squeezed by the dehydrator (6) sent to the raw water adjustment tank (3) and repeatedly treated in this treatment system. It is.
FIG. 2 is a structural schematic diagram of the chemical injection pipe mixing and stirring machine (spiral mixer or line mixer) (20) of the present invention. The line mixer body (21) consists of a cylindrical body, and has an inlet (22) and an outlet (23) made of short pipes on the left and right sides of the main body (21) near the inlet and outlet. Further, baffle plates (partition plates or partition blades) (24) are provided at four locations on the side surface of the main body and at the center. The baffle plate (partition plate or partition blade 24) on the side surface of the main body is formed of a flat plate, and the central baffle plate (partition plate or partition blade 24) has a square shape. While passing through the baffle plate, the muddy water or the mixed treatment product and the drug are sufficiently mixed.
FIG. 3 is a flow sheet of the method for treating dredged sediment mud water of the conventional method (Japanese Patent Laid-Open No. 10-499). The bottom mud from the dredged area is introduced into a chemical injection pipe mixing and stirring machine (spiral mixer or line mixer) (20), and a water-filling agent is injected from the supply tank (31) and mixed. The mixture is transferred to the second line mixer and introduced, and a neutralizing agent is injected from the supply tank (32) and mixed. The mixture is further transferred to the third line mixer (20) and introduced, and the polymer flocculant is injected from the supply tank (33) and mixed. The obtained mixture is sufficiently flooded and subjected to the following treatment, for example, treatment for separating water and solid matter (soil), for example, filtration treatment.
In the figure, 34 is a supply pump, 35 is a flow meter, 36 is a supply hose, 27 is a check valve, 28 is an inlet, 26 is a flange, 24 is a partition plate, 25 is a partition plate support, and 37 is a control. The valve 22 is an inlet made of a short pipe, and 23 is an outlet made of a short pipe.

Examples of the present invention will be described below with reference to the drawings, but the present invention is not limited to these examples.
Example 1
Raw muddy water treated by medium-sized (scale) treatment system (sewage) is passed through a screen (removing large impurities) and flows into a subsurface flow control pond (subsurface flow control tank) (2) (47.91 m ³ ) with natural fluid ( Influent raw water quality: pH 6.5-7.4, SS 50-110 mg / l, COD 55-221 mg / l, BOD 20-69 mg / l, NH ₃ -N4.5-11.2 mg / l, OIL 0.9-9. 5 mg / l).
(In the water quality, pH: hydrogen ion concentration, SS: suspended solid content, COD: chemical oxygen demand,
BOD: biochemical enzyme requirement, NH ₃ -N: ammoniacal nitrogen, OIL: normal hexane. )
The raw water flowing into the underground flow rate adjustment tank (2) is sent to the raw water adjustment tank (3) (459m ³ ) by the submersible pump (capacity 120 m ³ / h) (starting and stopping of the submersible pump is automatically controlled by the liquid level sensor) )
Raw water (sewage) is passed through a 125 A (125 mm diameter) pipe from a raw water adjustment tank (3) with a submersible pump (capacity 130 m ³ / h) at a flow rate of 1500 liters / minute, and a solid-liquid separation mixer (Spira mixer) ) 20 (The start and stop of the submersible pump are automatically controlled by the liquid level sensor). (Size of Spira mixer, length 500-1100 mm, entrance / exit diameter 125 mm, intermediate part diameter 250 mm).
The amount added to the first stage Spira mixer 20 is 0.1 to 1% with respect to the muddy water 1. A water soaking agent (DLH) is added from tank 31, 31 ′ or 31 ″ by metering pump (P). The metering pump is acid resistant and has a capacity of 0.2 to 2.1 liters / min. In addition, the flow meter of the DLH metering pump uses a non-contact type flow meter because the drug is strongly acidic (the addition amount is automatically controlled by an electromagnetic flow meter).
The raw water (sewage) mixed with the water soaking agent (DLH) passes through 20 m of the 125A reaction tube (4) and finishes the water soaking reaction before reaching the second stage Spiramixer (20 ') (water soaking). The water and dirt molecules are completely separated by the reaction).
In the Spira mixer 20 ′ of the second step, the neutralizing agent DLα (sodium hydroxide) is added from the tanks (32) and (32 ′) by the metering pump (P). The amount of neutralizer added is 0.2 to 1% with respect to mud water 1 (the metering pump capacity is 0.5 to 10 liters / minute, and the amount added is automatically controlled by an electromagnetic flow meter at the JDS facility inlet. )
The raw water (sewage) to which the neutralizing agent DLα (sodium hydroxide) has been added passes through 30m of the 125A reaction tube (4 ') and completes the neutralization reaction before reaching the third stage Spiramixer (20 "). (The raw water becomes neutral due to the neutralization reaction, and the effect of the polymer flocculant added in the third step is improved).
In the third stage Spiramixer (20 ″), the polymer flocculant DLN is added from the tanks (33) and (33 ′) by the metering pump (P). ˜1% (metering pump capacity is 2.0-20.5 liters / min, addition amount is automatically controlled by electromagnetic flow meter at JDS facility inlet).
The processed product to which the polymer flocculant DLN has been added and mixed passes through a reaction tube (4 ″) 40 m of 125A, and forms a large floc before reaching the settling tanks (5) to (5 ″).
The treated material flowing into the settling tanks (5) to (5 ″) stays for about 1 hour, and then only the clean water is discharged. In the settling tanks (5) to (5 ″) (30 m ³ × 4 units) Is equipped with a pH meter, UV meter (COD measurement device is installed, the JDS system automatically stops when measuring the pH (lower limit 6 or lower, upper limit 9 or higher), COD numerical value (80 mg / over) (Treated water quality: pH 6.8 to 7.2, SS _{7 to} 21 mg / l, COD 9 to 51 mg / l, BOD 3.9 to 9 mg / l, NH ₃ —N4 3.0 to 5.1 mg / l, OIL 0. 25 to 1.75 mg / l).
The floc settled in the settling tanks (5) to (5 ″) is sent to a dehydrator (filter press) (6), (6 ′) by a sludge extraction pump (P) (5 m ³ / h).
The sludge squeezed by the dehydrator (filter press) (6) to (6 ′) becomes a solid and is sent to the solid storage boxes 7 and 7 ′ (cake stand) for storage (dehydrator filter plate 720 × 720 × 53 40 rooms) x 2). Solids are used for landfill or recycling (fertilizer, etc.).
The water squeezed by the dehydrators (filter press) (6) to (6 ′) is sent to the raw water adjustment tank (3) and further processed by the processing system.
In this example, the raw water (sewage) is DLH (sludge clean), DLα neutralizer (sodium hydroxide), and 3 spira mixers (line mixer) containing DLN (polymer flocculant) (powerless high speed) Stirrer (20), (20 ′), (20 ″), 125A provided at the outlet of the Spiramixer, total length 90 m reaction tube (4), (4 ′), (4 ″) The treated sewage is agglomerated within.
The storage space of the reaction tube is 1200 mm (vertical) x 9400 mm (horizontal) x 1750 mm (height), and six tanks (31) to (33) for drug addition (two tanks for each drug) Yes, if one level gauge senses a low level, it automatically switches to the other tank and a chemical is added), etc., and the sewage treatment system (JDS) equipment area is 9400 mm x 6950 mm 65 .33 m ² .
A facility with a daily throughput of 2200 m ³ / day is included in the 322 m ² site (the smallest treatment plant in the world).
The present invention has the following effects by using a specific spira mixer (line mixer) and a water soaking agent.
The line mixer of the present invention is cylindrical, and the diameter of the central enlarged portion is twice as large as the diameter of the outlet. The length is four times, baffle plates are provided at the entrance and the center, and the drug and muddy water are mixed and stirred in proportion to the square of the number of baffle plates. Since the volume of the central enlarged portion is wide, the flow rate is not hindered. This makes it possible to mix and separate the solid and liquid by effectively utilizing the natural flow due to the gradient or the like. In addition, the water-repelling agent hedrocrine H / C used in the present invention is economical because of its high aggregability and safety. Hedocrine H / C has a jetter potential of 300 mV or more and a strong potential of 2 to 3 times that of other flocculants, so the cohesiveness is 10 to 15 times faster. Separation is most effective.
In addition, since the specific reaction hose or tube is used after mixing with the Spira mixer, the agglomeration reaction is performed smoothly, and since the hose or tube is used, the equipment area can be reduced.
Results of safety test (1) Germination test of Komatsu leaf (2) Breeding test of Japanese medaka (3) Ocean bottom organism effect test (4) Mutagenicity test Negative DNA damage when adding Hedocrine H / C 1,000PBM Thus, no effect of hedrocrine H / C on the DNA level was observed.

  Since the polluted sewage treatment system of the present invention uses a long hose or tube to carry out the agglomeration reaction of the muddy water, the agglomeration reaction can be carried out smoothly, and the hose or tube can be appropriately reduced in equipment use area. Therefore, it can be a medium-sized or small-sized device, and can be said to be an epoch-making system and extremely useful. Treated water can also be used for cooling water and watering.

It is a flow sheet of the contaminated mud water treatment of the present invention. It is a structure schematic diagram of the line mixer of this invention. It is a flow sheet of dredged sediment muddy water treatment of a conventional method (Japanese Patent Laid-Open No. 10-499).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Contaminated mud water processing system 2 Flow rate adjustment tank 3 Raw water adjustment tank 4, 4 ', 4 "Mixing hose or tube 5, 5', 5" Settling tank 6, 6 'Dehydrator 7, 7' Solid matter storage box 11 Dust removal Machine 20, 20 ′, 20 ″ Line (spiral) mixer 21 Mixer body 22 Muddy water inlet 23 Drain outlet 24 Partition plate 25 Partition plate support 26 Flange 27 Check valve 28 Drug inlet 31, 31 ′, 31 ″ ( Supply tank) (water proofing agent)
32, 32 '(supply tank) (neutralizing agent)
33, 33 '(supply tank) (polymer flocculant)
P pump

Claims (9)

In a muddy water treatment system for treating muddy water with one or more solid-liquid separators containing muddy water treatment agents, treating the treated mixture in a septic tank as necessary, and then separating it into a precipitate and purified water. A contaminated muddy water treatment system comprising agglomeration reaction of the treated muddy water in the liquid separator in a mixing hose or tube. The solid-liquid separation device is a mixer 21 composed of a cylindrical main body, and the mixer main body has an inlet 22 for contaminated mud water and a discharge outlet 23 for a mixed treatment product, each consisting of a short tube narrower than the main body. The mixer 21 is provided with a drug supply pipe 36 for introducing a muddy water treatment agent through a drug injection port 28 at its inlet, near the inlet and outlet of the main body, and near the inlet and outlet. A partition plate made of a flat plate is fixed to each of four internal side surfaces from the side surface toward the center, and the mixer cylinder is located in the middle of the partition plate made of the four flat plates inside the inlet and the outlet. In the central part of the circular cross section of, it is composed of what is fixed with a `` U-shaped '' partition plate arranged so that its tip end is directed toward the introduction port, and if necessary, Two or more similar mixers that introduce one or more drugs Pollution mud treatment system of claim 1 wherein the solid-liquid separation device, for the treatment of polluted mud which comprises coupling. 3. The polluted mud water treatment system according to claim 2, wherein the cylindrical main body of the solid-liquid separator has a diameter of the central enlarged portion twice that of the outlet and a length four times that of the outlet. The polluted mud water treatment system according to claim 2 or 3, wherein the mixer main body is a horizontal one. The polluted mud treatment system according to claim 1, wherein the mud treatment agent is selected from one or more of a flooding agent, a neutralizing agent and a flocculant. The contaminated mud treatment agent according to claim 1, wherein the mixing hose or tube is long. The contaminated mud water treatment system according to claim 1 or 6, wherein the mixing hose or tube is folded or wound in a zigzag shape. The contaminated mud water treatment system according to claim 1, 6 or 7, wherein the mixing hose or tube has a length of 10 to 100 m. The solid-liquid separator is composed of a water repellant containing device (1), a neutralizing agent containing device (2) and / or a polymer flocculant containing device (3), and the reaction hose or tube of the separating device (1) is 20 m. The polluted mud water treatment system according to claim 1, 6, 7 or 8, wherein the reaction hose or tube of the separation device (2) is 30 m and the reaction hose or tube of the separation device (3) is 40 m.

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