JPS6228683B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a flocculant composition consisting of fibers, a polymer flocculant, and a wetting agent, in which the fibers and the polymer flocculant are well mixed, resulting in less material separation. The present invention relates to a flocculant composition in which a molecular flocculant is quickly and easily dissolved and has excellent effects as a flocculant, and a method for producing the same. The present inventors have previously discovered that when fibers are used in combination with a polymer flocculant in sludge flocculation and solid-liquid separation (dewatering), the dewatering efficiency can be dramatically improved compared to using a polymer flocculant alone. Particularly in mechanical dehydration, pressure dehydration, for which sufficient results could not be obtained with polymer flocculants alone, can easily be performed, and vacuum,
It has been found that dewatering can be performed efficiently using centrifugal, pressurized, and other types of dehydrators, and the overspeed can be accelerated and the water content of the dehydrated cake can be lowered, thereby greatly improving the dehydration processing capacity. In the method of using a polymer flocculant and fibers together, a method is usually used in which a polymer flocculant is dissolved in water to prepare a treatment liquid in which fibers are dispersed, and this is added to sludge. Measuring is more complicated than when using it alone, and the inclusion of air bubbles when dissolving and dispersing the polymer flocculant and fibers prevents uniform dispersion of the fibers, so various precautions are required and it takes time and effort. There was a problem. The purpose of the present invention is to solve the above-mentioned problems and fully exhibit the excellent advantages.It is easy to measure and handle, and the polymer flocculant dissolves quickly in water, and the fibers disperse quickly. To provide a flocculant composition in which a polymer flocculant and fibers are mixed together as a single agent, and which exhibits excellent effects on flocculation of solids such as sludge, solid-liquid separation, mechanical dewatering, etc., and a method for producing the same. It is. The present invention also provides a flocculant composition comprising (1) fibers, a polymer flocculant, and a wetting agent, where the wetting agent is selected from liquid polyethylene glycol, methanol, ethanol, propanol, butanol, etc. (hereinafter simply referred to as water-soluble solvent), or agglomerated water-soluble solvent prepared by adding a surfactant and/or an emulsion-type silicone antifoaming agent to the water-soluble solvent. agent composition. and (2) a mixture is prepared by mixing the fibers treated with the above-mentioned water-soluble solvent or a water-soluble solvent with a surfactant and/or an emulsion-type silicone antifoaming agent added and a polymer flocculant powder. A method for producing a flocculant composition. This is related to. The fibers used in the present invention include inorganic fibers such as asbestos, glass fiber, and rock wool; natural fibers or artificial fibers such as cotton, hemp, wool, cow wool, wool, silk, paper, pulp, rayon, and acetic acid human silk; polyester,
Synthetic fibers such as vinylon, polyamide, aromatic polyamide, acrylic, polypropylene, polyvinyl chloride, and polyvinylidene chloride, carbon fiber, and metal fiber can be used, but in general, organic natural fibers, artificial fibers, Synthetic fibers are used. These fibers have a length of about 1 to 30 mm, preferably about 2 to 20 mm. The fibers used may be single fibers, fibers obtained by cutting a plurality of bundled fibers, thread-like fibers, etc., but single fibers are most preferred. The thickness of the monofilament used is usually 50 deniers or less, preferably 30 deniers or less. Cut or loosened woven fabrics, non-woven fabrics, reticulated fabrics, etc. can also be used, but the fibers must be sufficiently unraveled and separated. New fibers, recycled fibers, waste fibers, etc. can be used, but these fibers must be sufficiently unraveled and separated.
The fibers can be surface-treated with surfactants or dispersants to make them more easily dispersed in water, or fibers that have not been subjected to such treatment can be used. Fibers have the effect of significantly improving the coagulation effect of the polymer flocculant. That is, it increases the strength of the flocs and facilitates the separation of water that is likely to be retained in the flocs. Mechanical dewatering can significantly reduce the moisture content of the dehydrated cake and improve the peeling of the dehydrated cake. The polymer flocculant used in the present invention is a natural or synthetic organic polymer flocculant in powder form, and these include anionic, cationic, nonionic, and amphoteric types. Some examples are anionic ones such as polyacrylates, acrylic acid/maleic acid copolymer salts, acrylamide/sodium acrylate copolymers, acrylamide/sodium vinyl sulfonate copolymers, Examples include partial hydrolyzate of acrylamide, carboxymethyl cellulose soda salt, and sodium alginate. Cationic products include polydialkylaminoalkyl acrylate (methacrylate), polyaminomethylacrylamide, polyvinylpyridium salt, polydiacrylammonium salt, polyvinylimidazoline, polyamine, polyethyleneimine, cationic modified products of polyacrylamide, and cationic copolymers. water-soluble aniline resin hydrochloride, hexamethylene diamine/epiclerhydrin polycondensate, chitosan, cationic starch, etc. Nonionic materials include polyacrylamide, polyvinyl alcohol, polyethylene oxide, polyvinyl pyrrolidone, water-soluble urea resin, starch, pullulan, and guar gum. Bisexual types include gelatin. These polymer flocculants can be used alone or in combination. The polymer flocculant is the main ingredient that provides the flocculant function and effect of the flocculant composition of the present invention, and its effects are significantly improved due to the synergistic effect with the fibers. The liquid polyethylene glycol used as the water-soluble solvent used in the present invention is a polyethylene glycol that is liquid at room temperature even if it has an average molecular weight of about 190 to 700. Liquid polyethylene glycol (hereinafter referred to as polyethylene glycol), methitanol, ethanol, propanol (both n-propanol and isopropanol), butanol (t.butanol,
Although n-butanol, isobutanol, secondary butanol, etc. are generally used for industrial purposes, those that do not contain water are preferred. These water-soluble solvents can be used alone or in combination. The water-soluble solvent wets the fibers and the polymer flocculant, and is interposed between the fibers and the polymer flocculant to prevent them from being separated and unevenly distributed. In addition, the polymer flocculant can be quickly dissolved in water without forming powder. Furthermore, it has the effect of dispersing fibers into water quickly, easily, and uniformly. The surfactant used by adding to the water-soluble solvent includes cationic, anionic, nonionic, and amphoteric surfactants as well as dispersants. Known ones are used as these. In particular, cationic sludge is effective for organic sludge or sludge containing fine clay particles. For example, fatty acids or alicyclic monoamines having long-chain alkyl groups, diamines, triamines, amidoamines, polyaminoethyl imidazolines, long-chain hydroxyalkyl diamines, lodenamines, ethylene oxide adducts of these, and amines and ethylene oxide adducts of these. There are water-soluble acid salts, quaternary ammonium salts, etc. Surfactants dissolve polymer flocculants,
Improves fiber dispersion. Other cationic surfactants can adsorb to the solid content of sludge and make it hydrophobic, thereby improving the effectiveness of polymer flocculants. The emulsion type silicone antifoaming agent (hereinafter referred to as silicone antifoaming agent) is an oil-in-water type emulsion in which silicone oil is emulsified in water using an emulsifier. The silicone antifoaming agent is used by adding it to a water-soluble solvent, and it helps the dissolution of the polymer flocculant in water and the dispersion of fibers, making it quick and easy. In other words, it prevents the introduction of air bubbles during dissolution and dispersion, and also speeds up the dissolution of the polymer flocculant to prevent foaming from inside.
In particular, it prevents the fibers from floating due to air bubbles, allows the fibers to be uniformly dispersed, maintains uniform dispersion after being dispersed, and prevents the fibers from becoming entangled. The proportions of each constituent material of the flocculant composition of the present invention are:
Although it varies depending on the type of sludge or suspension to be targeted, in general, the amount of polymer flocculant is 0.04 to 10 parts by weight per 1 part by weight of fibers, and the amount of water-soluble solvent is 1 part by weight when spraying a water-soluble solvent onto fibers. The amount of water-soluble solvent relative to parts by weight may be 0.01 to 1 part by weight, preferably 0.05 parts by weight.
~0.6 parts by weight. When the fibers are wetted by immersing them in a water-soluble solvent, the amount is larger than the above amount (about 2 parts by weight). When a surfactant or a silicone antifoaming agent is added, either one of them or both may be used. The amount ranges from 0.004 to 20 parts by weight for surfactants and from 0.001 to 1.5 parts by weight for silicone antifoaming agents per part by weight of fiber. The flocculant composition of the present invention can be produced in the proportions described above, and the manufacturing method includes a method in which polymer flocculant powder is wetted with a water-soluble solvent and fibers are mixed therein, and polymer flocculant powder and fibers are mixed therein. There are various methods such as wetting the fibers with a water-soluble solvent, wetting the fibers with a water-soluble solvent and mixing the polymer flocculant powder with it, and the most preferred manufacturing method is as described below. . That is, the method for producing the flocculant composition of the present invention involves adding and mixing a water-soluble solvent or a water-soluble solvent containing a surfactant and/or a silicone antifoaming agent to fibers by spraying, spraying, scattering, or other means. Wet the fibers. Alternatively, the fibers are wetted by immersing them in a water-soluble solvent or a water-soluble solvent to which a surfactant and/or silicone antifoaming agent has been added. Even in this case, the polymer flocculant powder is added to the fibers treated with a water-soluble solvent or a water-soluble solvent containing a surfactant and/or a silicon antifoaming agent by a method such as scattering and mixed. Various known mixers can be used for mixing. When mixed in this manner, the fibers and polymer flocculant are brought together by the wetting agent, so that a mixture without separation of the two, ie, the flocculant composition of the present invention, can be produced. Next, the effects of the flocculant composition of the present invention and its manufacturing method will be summarized. (1) Since there is no separation of fibers and polymer flocculant, it is easy to measure and handle. (2) Even if the polymer flocculant is added to water all at once, it can be completely dissolved without forming any lumps.
Furthermore, the fibers can be dispersed quickly and evenly. Since air bubbles are difficult to enter during dissolution and dispersion, not only can the dissolution and dispersion time be shortened, but the fibers are also difficult to separate over time. (3) The use of silicone antifoaming agent makes the dispersion of the dissolved fibers of the polymer flocculant into water faster and better, and the effect of the present flocculant composition is fully exhibited. When this flocculant composition is added to water to dissolve the polymer flocculant and create a treatment liquid in which fibers are dispersed, no air bubbles enter the treatment liquid, so the fibers do not float due to air bubbles, so the fibers are uniform. There is no need to worry about them being dispersed and intertwined. Because the treatment liquid does not contain air bubbles and the fibers are uniformly dispersed, when this treatment liquid is added to sludge or suspension to coagulate the solids to form a floc, it forms a floc that does not contain air bubbles, so it is difficult to machine. When performing dehydration, there is no loss in dehydration efficiency due to air bubbles. (4) Excellent coagulation of solid content in sludge and suspension, solid-liquid separation, mechanical dewatering, etc. (Effect of combined use of polymer flocculant and fibers) Since the flocs are strong and have good water separation properties, solid-liquid separation can be achieved fairly well by natural evaporation, but water can also be sufficiently dehydrated by pressurization. Mechanical dewatering (by belt filter, decanter, belt press filter, etc.)
The dehydration rate is fast, the water content of the dehydrated cake is low, the water is well squeezed out, and the dehydrated cake has good peelability. Therefore, the dewatering efficiency is significantly improved and the processing capacity of the machine can be increased. (5) The effect of the flocculant composition does not change over time. The flocculant composition of the present invention is constituted as described above and has excellent effects, so that it can
It is suitable as a flocculant for flocculation, solid-liquid separation, dewatering, etc. of solid content of water sludge, bottom sludge from rivers, lakes, ports, sea areas, sludge from industrial wastewater, sludge, and other suspensions. This will be explained below using examples. Example 1 Polypropylene fiber P-tip (Chitsuso Co., Ltd. product, trade name,
2 denier, length 6 mm) and polyethylene glycol PEG 400 (manufactured by Sanyo Chemical Industries, trade name, average molecular weight 380-420), or PEG 400 with a quaternary salt of ethylene oxide adduct of beef tallow monoamine and silicone ester as a surfactant. foam agent toshiba silicone
Spray the mixture with TSA-730 using a spray gun, and add the cationic polymer flocculant Acofloc C-485 (Mitsui Cyamitsu product, trade name).
and mixed with a small drum mixer to form the flocculant composition of the present invention. This was placed in an approximately 200 ml glass pharmaceutical bottle, and the bottle was dropped from a height of 10 cm onto a rubber mat 200 times in succession with the bottom facing down, and the separation of the polymer flocculant and fibers was observed with the naked eye. Both No. 1 and No. 2 were well mixed with no separation. Comparative Example 1 For comparison, a polymer flocculant was sprinkled on fibers according to the formulation of Comparative Example A shown in Table 1 and mixed in the same manner. Then, this mixture was placed in a glass pharmaceutical bottle and subjected to a drop test in the same manner as in Example 1, but the polymer flocculant was dispersed downward.

[Table] Example 2 and Comparative Example The flocculant compositions of No. 1 and No. 2 shown in Table 1 and only the polymer flocculant used in A of Table 1 and Example 1 as a comparative example (this will be referred to as B) are dissolved in water to prepare a treatment solution in which the polymer flocculant concentration is 0.2%, and this is mixed raw sewage sludge (solid content 3.2% by weight, solid content A polymer flocculant was added to the sludge (loss by weight: 52% by weight, pH 6.2) in an amount of 5,000 ppm based on the solid content of the sludge, and mixed for 1 minute to form flocs, and the condition of the flocs was observed. Subsequently, a natural flow test was conducted for both solid and liquid, and the liquid volume per minute was measured. The test results are shown in Table-2. The test method is as follows. Test method: 100g of sewage sludge is treated with a specified amount of treatment liquid (the amount of polymer flocculant is
5000 ppm) was added and mixed for about 1 minute to form flocs. Those with good floc formation and good solid-liquid separation were evaluated as good, and those that did not were evaluated as poor. Subsequently, these solids and liquids were placed together in a Buchner funnel.
Place it on a sheet of 5A paper and leave it for 1 minute to let it cool down naturally.The amount of water and liquid flowing out in 1 minute is expressed as a percentage (%) of the sum of the sludge treatment liquid.

[Table] Example 3 Put 100 parts by weight of P chips into a wire mesh basket.
A flocculant composition (No. 3) was prepared by immersing the sample in PEG400 for 1 minute, pulling it out and leaving it for 10 minutes, then scattering 12.5 parts by weight of Acofloc C-485 powder and mixing in a Hobart mixer. Example 1 about this item
A drop test was conducted in the same manner as above, but no changes in separation or classification of the polymer flocculant and fibers were observed. In addition, this product was added to sewage mixed raw sludge in the same manner as in Example 2, and a flocculation test was conducted, and floc formation was good and the liquid volume was 79.3%. Example 4 No. 1 and No. 2 of Example 1 and No. 3 of Example 3 were stored in a container at room temperature for one month and subjected to a drop test and aggregation in the same manner as in Example 1 and Example 2. In all tests conducted, good results were obtained and no deterioration in performance was observed.

Claims (1)

[Scope of Claims] 1. A flocculant composition comprising fibers, a polymer flocculant, and a wetting agent. 2. The wetting agent according to claim 1, wherein the wetting agent is a water-soluble solvent formed by mixing one or more selected from liquid polyethylene glycol, methanol, ethanol, propanol, butanol, etc. Flocculant composition. 3 A water-soluble solvent in which the wetting agent is a mixture of one or more selected from liquid polyethylene glycol, methanol, ethanol, propanol, butanol, etc., and a surfactant and/or an emulsion-type silicone antifoaming agent added thereto. The flocculant composition according to claim 1, characterized in that: 4. A method for producing a flocculant composition, which comprises mixing fibers treated with a wetting agent with polymer flocculant powder to prepare a mixture. 5. The wetting agent according to claim 4, wherein the wetting agent is a water-soluble solvent obtained by mixing one or more selected from liquid polyethylene glycol, methanol, ethanol, propanol, butanol, etc. A method for producing a flocculant composition. 6 A water-soluble solvent in which the wetting agent is a mixture of one or more selected from liquid polyethylene glycol, methanol, ethanol, propanol, butanol, etc., and a surfactant and/or an emulsion-type silicone antifoaming agent added thereto. A method for producing a flocculant composition according to claim 4, characterized in that: