KR100334053B1 - Wastewater Disposal agent And Process For Preparing thereof - Google Patents

Abstract

Disclosure of Invention An object of the present invention is to provide a treatment agent and a manufacturing method for economically treating color and pollutants (COD, BOD) in leachate and dye wastewater generated from landfills.

In the present invention, in chemically treating contaminants in wastewater flowing into a raw water tank, the chemical treating agent is sulfuric acid, ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (FeCl _2, XH ₂ O) and the agent of any one of these ferrous mixtures, and ferric sulfate [Fe₂ (SO ₄ ) ₃ ] or ferric chloride (FeCl _3, XH ₂ O) or ferric mixtures thereof In order to obtain any one of the chemicals in the tank sequentially after mixing and stirring at room temperature. This is characterized by economical and efficient wastewater treatment by reducing the use of expensive hydrogen peroxide water while reducing the amount of solids.

Description

Wastewater treatment agent and its manufacturing method {Wastewater Disposal agent And Process For Preparing Beautiful}

The present invention relates to a wastewater treatment agent and a method for manufacturing the same, in particular leachate generated from landfills and wastewater discharged from industrial sites such as dyeing factories (Color) and pollutants [COD, BOD, SS (float) ] To treat the wastewater economically and a method of manufacturing the same.

In general, leachate from waste landfill or dye wastewater discharged from dye factories and dyeing factories contains a lot of harmful substances, such as color and suspended solids (SS), that contaminate the natural environment as well as chemical oxygen demand. It is well known that COD and BOD are significantly higher malignant wastewater.

Conventionally, the method of treating such harmful pollutants uses the following methods. First, the method of treatment of dye wastewater treatment and the biological treatment process as disclosed in the device and the second treatment method of chemical treatment process, and secondly, the chemical treatment process of Korea Patent Publication No. 145467 (98.4.30). Post-biological treatment and sometimes the first and second methods are combined twice. In these various methods, the chemical treatment process treats wastewater using various chemicals.

Chemicals used in such chemical treatment methods include neutralizing agents such as acids or alkalis, inorganic coagulants such as ferrous chloride and ferrous sulfate, H 2 O 2 solution and organic polymer coagulants. Doing.

However, in this method (also called FENTON method), the use of hydrogen peroxide water, which is expensive, takes up a large amount of the chemicals used in total, which increases the cost of wastewater treatment and the occurrence of sludge. In addition, there is an inefficiency and an economical point, such as excessively increased sludge treatment costs, and there is also a problem that the efficiency of wastewater treatment is only about 40 to 60%.

On the other hand, those developed as a method to solve this problem are registered in Korea Patent No. 148845 (registered on June 1, 1998) "New wastewater treatment agent and its treatment method" and Registered No. 153331 (Aug. 1998) "For wastewater treatment Bleaching and coagulant composition ", Registration No. 165526 (1998.9.16)" Manufacturing method of wastewater treatment agent ", and Publication No. 85-1393 (1985.9.30)" Coagulant composition for water and wastewater treatment ", etc. There are disadvantages in that economic efficiency is poor due to complicated processes.

Accordingly, an object of the present invention is to provide a wastewater treatment agent and a method of manufacturing the same to solve the above-mentioned shortcomings and to economically and efficiently treat pollutants (color, suspended solids, BOD, COD) in wastewater.

In order to achieve the above object, the wastewater treatment agent of the present invention comprises 98 wt% sulfuric acid, ferrous sulfate (FeSO _4, XH ₂ O) or 1 to 49% by weight of any one selected from ferrous chloride (FeCl _2, XH ₂ O) and ferrous mixtures thereof, and ferric sulfate [Fe₂ (SO ₄ ) ₃ ] or ferric chloride (FeCl _3, XH ₂ O) or 1 to 50% by weight of any one drug selected from the ferric mixtures thereof is characterized by mixing and stirring.

It is characterized in that it further comprises 0.01 to 99.9% by weight of the drug of any one of titanium dioxide or titanium compound with respect to the total weight of the wastewater treatment agent.

In addition, in order to achieve the above object, the method for producing a wastewater treatment agent of the present invention is a method for producing a treatment agent for treating contaminants in wastewater related to the invention of claim 3, wherein the treatment agent is 98% by weight of sulfuric acid and ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (Fe Cl _2, XH ₂ O) and any one selected from the ferrous mixture of 1 to 49% by weight of the drug and ferric sulfate [Fe₂ (SO ₄ ) ₃ ] or 1 to 50% by weight of any one of the chemicals selected from ferric chloride (FeCl _3, XH ₂ O) or ferric mixtures thereof are sequentially added into the tank and obtained by mixing and stirring at room temperature It is done.

The treatment agent (trade name: HI SOL) made of ferrous sulfate and ferrous chloride, ferrous sulfate and ferric chloride, titanium dioxide and titanium compounds, etc., as the inorganic flocculant, are pollutants in wastewater. By carrying out the chemical action of oxidative decomposition, the consumption of hydrogen peroxide which is added to the oxidant later is reduced.

The reason for adding titanium dioxide or a titanium compound in the above is to more actively oxidize the pollutants.

Hereinafter, a more preferred embodiment of the wastewater treatment agent and its preparation method according to the present invention will be described in detail.

Leachate discharged from landfills and dyeing wastewater discharged from dyeing factories are stored in the raw water tank and stored.In this case, pollutants contained in the wastewater are treated through physical treatment, chemical treatment and solid-liquid separation. The present invention is to be used as a chemical treatment agent such as hydrogen peroxide in the chemical treatment step.

Example 1

98% by weight of sulfuric acid _, 1% by weight of a drug selected from ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (FeCl _2, XH ₂ O) or a mixture thereof, and ferric sulfate Contamination in wastewater by adding 1% by weight of one of the chemicals selected from [Fe₂ (SO ₄ ) ₃ ] or ferric chloride (FeCl _3, XH ₂ O) or mixtures thereof into a tank and mixing and stirring at room temperature A treatment agent (trade name HISOL) for treating the material was obtained.

The amount of hydrogen peroxide water added and the final sludge produced (solid) And reduction of COD were measured. The results are shown in Table 1.

Example 2

0.01 to 99.9% by weight of any one of titanium dioxide or a titanium compound was added to the total weight of the wastewater treatment agent obtained from Example 1 to obtain a treatment agent (trade name HISOL) for treating contaminants in the wastewater. The amount of the treatment agent thus obtained was added to 1 ton of raw wastewater as shown in Table 1, and then the amount of hydrogen peroxide solution introduced, the amount of sludge produced (solid) and the amount of COD reduction were compared. The results were as shown in Table 1.

As can be seen from Table 1, when the treatment agent of the present invention is used in the treatment of contaminants in wastewater, it can be seen that the amount of hydrogen peroxide water, which is expensive compared to the conventional chemical input, is significantly reduced. In comparison, the incidence of sludge and COD are significantly reduced.

In addition, the treatment agent made from the above embodiments is preferably equipped with a stirrer or air agitation in order to suppress the generation of deposits during storage.

In addition, although not described in the above embodiment, when the aluminum solution is used as an acid aid in the water treatment agent, the wastewater may be effectively treated.

As described above, according to the present invention, a treatment agent used for chemically treating contaminants in wastewater is ferrous sulfate and ferric chloride, iron solution such as ferric sulfate and ferric chloride, and titanium. By mixing and stirring oxidizing agents such as compounds, it is possible to reduce the amount of hydrogen peroxide added in the future, and to reduce the production cost of sludge by reducing the amount of sludge generated, and also to add conventional Even if the amount is less than the amount of chemicals, there is an effect that can significantly reduce the contaminants in the waste water, that is, BOD, COD.

Claims (3)

In the treating agent for treating contaminants in waste water, 98% by weight of sulfuric acid and 1 to 49% by weight of the drug selected from ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (FeCl _2, XH ₂ O) and ferrous mixtures thereof ) And 1 to 50% by weight of any one selected from ferric sulfate [Fe₂ (SO ₄ ) ₃ ] or ferric chloride (FeCl _3, XH ₂ O) or ferric mixtures thereof Wastewater treatment agent. The wastewater treatment agent according to claim 1, further comprising 0.01 to 99.9 wt% of any one of titanium dioxide or a titanium compound based on the total weight of the wastewater treatment agent. In the manufacturing method of the processing agent for processing the contaminant in wastewater, The treatment agent is 98% by weight of sulfuric acid, and 1 to 49 weights of any one selected from ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (FeCl _2, XH ₂ O) and ferrous mixtures thereof. % And 1 to 50% by weight of any one of the agents selected from ferric sulfate [Fe₂ (SO ₄ ) ₃ ] or ferric chloride (FeCl _3, XH ₂ O) or ferric mixtures thereof Method for producing a wastewater treatment agent was mixed and stirred at room temperature after the addition.