KR20010045515A - Wastewater Disposal agent And Process For Preparing thereof - Google Patents

Abstract

PURPOSE: A wastewater treatment agent for economical treatment of leachate, dyeing industry wastewater is provided to displace expensive hydrogen peroxide, a main chemical in fenton oxidation process, and to reduce the amount of sludge. CONSTITUTION: The wastewater treatment agent comprises (i) 1 to 49wt.% of one chemical selected from ferrous sulfate (FeSO4·XH2O), ferrous chloride (FeCl2·XH2O); (ii) 1 to 98wt.% of sulfuric acid; (iii) 1 to 50wt.% of one chemical selected from ferric sulfate£Fe2(SO)3|, ferric chloride (FeCl3·XH2O).

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 not only humans but also harmful substances that contaminate the natural environment such as color and suspended solids (SS) 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. The first is a method of treating with a chemical treatment process after the biological treatment process as disclosed in Korean Patent Application Publication No. 145467 (98.4.30) 'Method and apparatus for dyeing wastewater,' and the second is a chemical treatment process. There is a case where the treatment with a biological treatment after coarse treatment and sometimes a combination of the first and second methods is performed 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 known as the FENTON method), the use of hydrogen peroxide water, which is expensive, accounts for a large amount of the chemicals used, and thus increases the cost of wastewater treatment and the occurrence of sludge more than necessary. In addition, there is a problem that the efficiency of the waste water treatment is only about 40 to 60%, and there are also inefficiencies such as excessively increased sludge treatment costs.

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 Registration No. 153331 (1998.7.3) "Bleaching for wastewater treatment. And a 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 is a disadvantage that the economy is poor because the back is complicated.

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

In order to achieve the above object, the wastewater treatment agent of the present invention is a treatment agent for treating contaminants in wastewater related to the invention of claim 1, wherein 1 to 98% by weight of sulfuric acid and ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (FeCl _2, XH ₂ O) and any one selected from the ferrous mixture of 1 to 49% by weight of the drug, ferric sulfate [Fe₂ (SO ₄ ) ₃ Or ferric chloride (FeCl _3, XH ₂ O) or a ferric compound selected from the mixture of ferric 1 to 50% by weight (%) is characterized by mixing and stirring.

Regarding the total weight of the wastewater treatment agent, it is characterized in that it further comprises 0.01 to 999.9% by weight of the drug of any one of titanium dioxide or titanium compound.

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

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 wt% sulfuric acid _, 1 wt% chemical of any one selected from ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (FeCl _2, XH ₂ O), or a mixture thereof, 1 weight (%) of any one of chemicals selected from ferric sulfate [Fe₂ (SO ₄ ) ₃ ] or ferric chloride (FeCl _3, XH ₂ O) or a mixture thereof is sequentially added into a tank and mixed at room temperature. Stirring gave a treating agent (trade name HISOL) for treating contaminants in wastewater.

The amount of hydrogen peroxide water added and the final sludge produced (solids) were added to the treatment agent and the conventional treatment agent (FeCl₂) in the amount shown in Table 1 for 1 ton of wastewater discharged from leachate and dyeing plant. And reduction of COD were measured. The results are shown in Table 1.

<Example 2>

A treatment agent (trade name HISOL) for treating contaminants in wastewater was added by adding 0.01 to 999.9% by weight of any one of titanium dioxide or a titanium compound to the total weight of the wastewater treatment agent obtained from Example 1. The treatment agent thus obtained was subjected to the same amount as shown in Table 1 with respect to 1 ton of raw wastewater, and then the amount of hydrogen peroxide solution introduced, the amount of sludge produced (solid) and the amount of reduction in COD were compared. The results were as shown in Table 1.

Inorganic coagulant Hydrogen peroxide (H2O2) input amount (%) pH Sludge Volume (30 minutes) ml CODppm Remarks division Input ppm Dosageml Inorganic flocculant H2O2 H2SO4ml Aeration NAOHml Conventional (FeCl₂) 1400 0.7 0.074 6.89 6.14 0.24 3.68 1.5 60 86 H2SO4: 25% (W / W) NaOH: 2.5% (W / W) Raw Wastewater pH: 7.40 Polymer Coagulant Input- (Yiyang Chemical) -2ppm (0.1%) Conventional (FeCl₂) 1600 0.8 0.084 6.75 5.89 0.22 3.61 1.9 70 84 Conventional (FeCl₂) 1800 0.9 0.095 6.64 5.22 0.13 3.52 2.2 90 80 This product 1400 0.7 0.009 4.97 4.05 0.05 3.59 1.0 55 77 This product 1600 0.8 0.011 4.39 3.44 - 3.31 1.7 57 73 This product 1800 0.9 0.012 3.42 3.38 - 3.27 2.4 60 70

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 the oxidizing agent such as a compound, it is possible to reduce the input amount of hydrogen peroxide in the future, and to reduce the generation cost of the sludge by reducing the amount of sludge generated, and also to add the conventional input 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, 1 to 98% by weight of sulfuric acid _, any one selected from ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (FeCl _2, XH ₂ O) and ferrous mixtures thereof 49% by weight, and 1 to 50% of the drug selected from ferric sulfate [Fe₂ (SO ₄ ) ₃ ] or ferric chloride (FeCl _3, XH ₂ O) or ferric mixtures thereof Wastewater treatment agent by mixing and stirring. The wastewater treatment agent according to claim 1, further comprising 0.01 to 999.9 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 any one selected from 1 to 98% by weight of sulfuric acid, ferrous sulfate (FeSO _4, XH ₂ O) or ferrous chloride (FeCl _2, XH ₂ O), and ferrous mixtures thereof. 1 to 49% by weight of any of the agents selected from ferric sulfate [Fe₂ (SO ₄ ) ₃ ] or ferric chloride (FeCl _3, XH ₂ O) or ferric mixtures thereof Method of producing a wastewater treatment agent by mixing the weight (%) sequentially in a tank and mixed and stirred at room temperature.