JP2007069195A - Hydrophobizing/solid-liquid separating agent for treating filthy water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydrophobilizing/solid-liquid separating agent which is a combination of powder of waste gypsum being industrial waste, an ionic dehydrating agent and powdery aluminum sulfate and is used for separating a solid and water from filthy water. <P>SOLUTION: The hydrophobilizing/solid-liquid separating agent for treating filthy water is obtained by uniformly mixing gypsum or powder of a gypsum board of 100 parts weight, the ionic dehydrating agent of 0.1-2 parts weight and powdery aluminum sulfate of 0.1-3 parts weight. The obtained hydrophobilizing/solid-liquid separating agent is powder and can easily hydrophobilize, flocculate, dehydrate and separate filthy water into the solid and water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

      The present invention is applicable to construction mud generated on the site such as dam construction, lake sludge, rivers, harbors, dams, seabed sludge, organic sludge generated in udon stores, ramen stores, sludge generated in slaughterhouses and meat processing, etc. The present invention relates to a hydrophobized solid-liquid separation agent that separates moisture from organic sludge contained in representative industrial wastewater and domestic wastewater, as well as plankton generated in the sea.

      Conventionally, in wastewater treatment such as sewage and soot sludge treatment, for example, a coagulation sedimentation treatment method is generally used to remove contaminants such as SS, COD, and BOD. The coagulant used in the coagulation / precipitation treatment is a polymer coagulant dissolved in water or the like, a solution type coagulant composed of aluminum sulfate, aluminum chloride or ferric chloride, an inorganic coagulant or an organic coagulant. It is divided into solid flocculants that are used as powders in combination with the agent.

When trying to use these flocculants for water treatment,
(B) The moisture content of the obtained dehydrated cake is a high value of about 80 to 90%, the fluidity of the dehydrated cake is also high, the properties are unstable, the moisture content increases with time, and it is easy to re-sludge. In addition, final disposal such as landfill and dumping is extremely difficult, and the treatment cost of sludge increases.
(B) When dewatering is performed at a dredging site where sludge is collected, the sedimentation rate of sludge is slow, so it takes many days to process and the living environment cannot be preserved due to spoilage and odor.
(C) Since the sedimentation rate of the obtained sludge is slow, it is not suitable for pre-water treatment for the purpose of protecting the reverse osmosis membrane used for high-precision purified water treatment.
(D) The flocculant is an inorganic metal salt having a charge property, and is expensive because it contains a plurality of substances having different ionic valences.
There were problems such as.
The present invention has been made to solve these problems.

In order to solve the above-mentioned problems, the present inventors have repeatedly studied various water treatment flocculants, and uniformly mixed and dispersed a small amount of an ionic dehydrating agent and aluminum sulfate in gypsum. Many processes such as pre-treatment with polyaluminum chloride or sulfuric acid band, etc., pH adjustment treatment with caustic soda, etc., coagulation treatment with polymer flocculant, precipitation treatment, etc. required for the treatment of contaminated water can be simplified or omitted, and It exhibits a coagulation-precipitation effect equal to or higher than that of other water treatment flocculants or solid-liquid separation agents consisting only of gypsum and a small amount of ionic dehydrating agent, excellent dewatering performance, and excellent cleaning effect of contaminated water. As a result, the present invention has been completed. In other words, the present invention

100 parts by weight of gypsum, 0.1 to 2 parts by weight of an ionic dehydrating agent and 0.1 to 3 parts by weight of powdered aluminum sulfate are uniformly mixed, and a hydrophobized solid-liquid separation agent for treating contaminated water,

Gypsum is a powder obtained by pulverizing waste gypsum which is industrial waste represented by gypsum board

The hydrophobized solid-liquid separation agent for treating contaminated water as described,

The ionic dehydrating agent includes at least one selected from cationic, anionic, nonionic or amphoteric dehydrating agents.

It is the hydrophobization solid-liquid separation agent for dirty water treatment of description.

      Hereinafter, the present invention will be described in detail. In the present invention, the above

An ionic dehydrating agent and powdered aluminum sulfate mixed uniformly with gypsum shown in FIG. In the present invention, it is essential to contain the ionic dehydrating agent and powdered aluminum sulfate in order to increase the sedimentation rate of the aggregated floc in the water in the powder state.

      Next, the gypsum used for the solid-liquid separating agent of the present invention will be described. Gypsum is dihydrated gypsum, natural gypsum, flue gas desulfurized gypsum, phosphate gypsum, waste gypsum mold material, gypsum board waste, or calcined gypsum, hemihydrate gypsum, hydraulic gypsum obtained by heat treatment, and Examples thereof include, but are not limited to, mixtures thereof. In particular, waste gypsum is preferred from the viewpoint of reducing the environmental burden and effectively using waste. The form of gypsum is preferably in the form of fine powder in order to increase the contact area with water and increase the efficiency of dispersion in sludge.

      Examples of the ionic dehydrating agent include commercially available cationic, anionic, nonionic and amphoteric dehydrating agents. In anionic and nonionic dehydrating agents, the main components are acrylic acid-based, polyacrylamide-based, acrylic acid / polyacrylamide-based, and polyacrylic acid soda-based, and cationic ones are polyacrylate ester-based, dimethylamino acrylate-based Dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, polyamidine and epoxyamine are amphoteric, and in amphoteric, at least one mixed system of dimethylaminoethyl acrylate, acrylic acid, acrylamide and methacrylic acid can be mentioned. However, it is not limited to these. In order to reduce the environmental load and increase the coagulation effect of various sludges with a small input amount, it is preferable to use a strong cationic or strong anionic dehydrating agent. The form of the ionic dehydrating agent is preferably in the form of a powder in order to increase the contact area with water and increase the efficiency of dispersion in sludge, similar to the form of gypsum.

      In the hydrophobized solid-liquid separation agent for treating contaminated water of the present invention

The content of the ionic dehydrating agent represented by is different in the amount of ionic species, ionic components, etc. contained in water or various sludges, so the blending amount is different and is not generally limited, but for 100 parts by weight of gypsum, Based on 0.5 parts by weight. In order to have an effect on the coagulation and precipitation of various sludges, the amount of the ionic dehydrating agent based on 100 parts by weight of gypsum is 0.1 to 2 parts by weight, preferably 0.1 to 1 part by weight, more preferably 0.1 to 0.5 part by weight. The compounding quantity of powder aluminum sulfate is 0.1-3 weight part, Preferably it is 0.1-2 weight part, More preferably, it is 0.1-1 weight part. When the content of the ionic dehydrating agent in the hydrophobized solid / liquid separating agent is 2 parts by weight or more, the transparency of the treated water is inhibited, which is not preferable. On the other hand, if it is less than 0.1 parts by weight, the solid-liquid separation performance and the removability of pollutants are deteriorated. Further, when the content of powdered aluminum sulfate in the hydrophobized solid-liquid separation agent is 1 part by weight or more, the pH of water is lowered, and when it is less than 0.1 part by weight, the solid-liquid separation performance and contaminants Removability is lowered, which is not preferable.

      Next, the sludge water treatment method of the present invention will be described. For example, sludge suspended water having a water content of 400% by weight is put into a beaker and stirred. Add powdery hydrophobized solid-liquid separation agent to the sludge suspended water with stirring. Ingredients: Gypsum, cationic dehydrating agent, powdered aluminum sulfate. After about 30 to 40 seconds from the end of the addition, the formation of granular sludge and the solid-liquid separation process are completed, and the purification of water, which is a liquid, starts, and the water is cleaned with time and the transparency is increased. Increasing the sludge turbid water stirring speed at the time of adding the hydrophobized solid-liquid separating agent increases the flocs and provides a higher coagulation effect. Only when the hydrophobized solid-liquid separation agent is uniformly mixed and dispersed, a great sludge removal effect can be seen. Even if each component is used alone or added sequentially at appropriate intervals, the sludge removal effect There is no significant effect on cleaning. When mixing sludge turbid water and hydrophobized solid-liquid separation agent, solid-liquid separation is promoted by increasing the temperature of the treated water by preheating the sludge turbid water or using high-temperature water such as boiling water. .

      The hydrophobized solid-liquid separating agent of the present invention alone is hydrophobic, cohesive, and dewatering, and has water dewatering properties due to its own weight. For this reason, since the fluidity | liquidity of a dewatering cake is low, a property is stable, a moisture content falls with time, and it does not mix with water again, Therefore The increase in the processing cost of sludge can be eliminated. In addition to this point, sludge flocculation removal speed is fast, and the agitation driving force necessary for sludge flocculation removal can be used for water flow. This is especially useful for the treatment of sludge in the field. The amount of the hydrophobized solid / liquid separating agent added to the sludge suspended water treatment amount varies depending on the sludge concentration, but the water content is 400% and the weight ratio is based on the hydrophobized solid / liquid separating agent / sludge muddy water = 1/5000.

      Since the cake obtained from sludge turbid water can suppress generation | occurrence | production of the turbid water by running water, water purification is performed efficiently. Moreover, since the hydrophobizing action is extremely high, the moisture content of the cake is low and the dehydration rate is fast compared to the cake after using other flocculants. It can be used as reclamation materials, land reclamation materials, vegetation soil and concrete aggregates, and can be reused. The properties of the water from which the sludge cake has been removed meet the drainage standards of the Water Pollution Control Law.

      The hydrophobized solid-liquid separation agent of the present invention makes use of its high solid-liquid separation performance, construction mud generated on the site such as dam construction, lakes, rivers, harbors, dams, submarine sludge, udon shop, ramen shop Organic sludge generated by slaughterhouse, meat sludge generated in industrial wastewater and domestic wastewater represented by meat processing, pretreatment agent for protection of reverse osmosis membrane used for high-precision water treatment, Furthermore, it can be used to separate water from plankton generated in the sea.

      In addition, the hydrophobized solid-liquid separation agent of the present invention makes use of its excellent coagulation and sedimentation performance, dewatering performance, and water purification performance to improve contaminated soil with heavy metals, farmland wastewater treatment, and water purification of freshwater and seawater farms. Used for cleaning wastewater from raw concrete vehicles, wastewater treatment at the end of concrete factories, wastewater treatment at steel and paper companies, wastewater treatment at painting and plating plants, wastewater treatment at food factories, sludge treatment of sewage, human waste, and septic tanks can do.

      In accordance with the present invention, in order to reduce the environmental load, industrial waste can be used effectively, and at the same time, it can be applied to dredged sludge, industrial wastewater, domestic wastewater, and plankton generated at sea. We provide a hydrophobized solid-liquid separation agent for the treatment of polluted water that excels in sludge sedimentation performance, dewatering performance, and polluted water purification that contribute to environmental conservation.

      Hereinafter, the effects of the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

Only the gypsum part was taken out from the gypsum board as industrial waste, and this was pulverized for 5 minutes with a tabletop powerful crusher FDS to obtain gypsum powder. After putting 100 g of this powder gypsum into the cup of Waring blender MMB142, 0.2 g of powder ionic dehydrating agent polyacrylate ester polymer flocculant which is a commercial product is added, and a uniform dispersion operation is performed for 60 seconds. Then, a hydrophobized solid-liquid separating agent 1 for treating powder polluted water was prepared.

    Similarly, only the gypsum part is taken out from the gypsum board, which is industrial waste, and 100 g of powder gypsum obtained by crushing it with a tabletop powerful crusher FDS for 5 minutes is put into a cup of the Waring blender MMB142, and then commercially available. 0.2 g of powdered ionic dehydrating agent polyacrylic acid ester polymer flocculant and 0.1 g of commercially available powdered aluminum sulfate (solid type No. 1 manufactured by Nippon Light Metal Co., Ltd.) were added. Thereafter, a uniform dispersion operation for 60 seconds was performed to prepare a hydrophobized solid-liquid separation agent 2 for treating powder polluted water.

＊粉末汚濁水処理用疎水性固液分離剤１を使用した場合に見られる浮遊フロックの大きさを小と定義し、これと比較して大きい場合を大と定義した。Next, 1000 g of the swamp water generated from the marsh in Sanuki City, Kagawa Prefecture was weighed and put into two 2 L beakers. Stirring of swamp water in which beaks are generated in a beaker is started using a stirrer, and the number of rotations of the stirring blade is stabilized at 80 rpm. After the agent 1 and the hydrophobized solid / liquid separating agent 2 for treating powder polluted water were added all at once, stirring was continued for 30 seconds, and then stirring was stopped. The time from when the stirring was stopped until the floc completely stopped and the sedimentation was completed, and the size of the floating floc that was observed from the start of the floc to the completion of the sedimentation were visually observed. The results are shown in Table 1. From Table 1, the hydrophobized solid / liquid separating agent 2 for powdered polluted water treatment showed better coagulation precipitation performance than the conventional hydrophobized solid / liquid separating agent 1 for treating powdered polluted water.

* The size of the floating floc seen when using the hydrophobic solid-liquid separation agent 1 for treating powder polluted water was defined as small, and the case where it was larger than this was defined as large.

    Using the hydrophobized solid-liquid separation agent 2 for treating powdery polluted water obtained in Example 1, the sedimentation test of polluted water was performed according to the following procedure.

      100 g of dry soil passed through a 4 mm sieve and 1000 ml of pure water produced by MilliQA10 manufactured by Millipore were added to a 3 L beaker, and three things were continuously stirred with a stirrer at 10 rpm for 10 minutes. did. Then, while maintaining the stirring of the three beakers, the first added the solid-liquid separating agent 2 for treating the powdered polluted water at a rate of 1% with respect to the weight of the polluted water. The second was the solid-liquid separating agent for treating the polluted water. 2 was added 0.2% at a time with respect to the weight of the contaminated water, and after the third, no addition was performed at the same time, all the three samples were stirred and maintained for about 30 seconds, and the standing time elapsed. The sedimentation state of the soil was investigated.

    As a result, the amount of addition of the solid / liquid separating agent 2 for treating powder polluted water was 0.2% and 1.0%, and in both cases, sedimentation of the soil particles was observed immediately after the addition, and the opposite side of the beaker was clearly visible after 30 seconds. Became. On the other hand, in the sample water without addition of the solid-liquid separating agent 2 for treating powder polluted water, the soil with large particles settles at the bottom of the beaker, but the small particulate matter remains floating, and after 30 minutes, The cloudiness was almost unchanged.

Regarding the water handled in the experiment in Example 2, the supernatant of the sample was collected immediately after the addition of the solid / liquid separating agent 2 for treatment of powder polluted water and after standing for 30 minutes, and BOD, COD, SS as drainage standard items. , Escherichia coli, normal hexane extract (oil) and other general bacteria, turbidity was analyzed. The results are shown in Table 2. From Table 2, BOD, COD, SS, and turbidity are extremely low immediately after 30 minutes have elapsed since the solid-liquid separating agent 2 for treating powder polluted water was added, and water purification was marked. It turns out that it has advanced to.

Claims (3)

A hydrophobized solid-liquid separation agent for treating contaminated water, in which 100 parts by weight of gypsum, 0.1 to 2 parts by weight of an ionic dehydrating agent and 0.1 to 3 parts by weight of powdered aluminum sulfate are uniformly mixed. 2. The hydrophobized solid-liquid separating agent for treating polluted water according to claim 1, wherein the gypsum is a powder obtained by pulverizing waste gypsum which is industrial waste represented by gypsum board. The hydrophobized solid-liquid separation agent for treating contaminated water according to claim 1, wherein the ionic dehydrating agent contains one or more selected from cationic, anionic, nonionic or amphoteric dehydrating agents.