KR20030053498A - The method and equipment of wastewater treatment contained organic compound of high concentration - Google Patents

Abstract

PURPOSE: An apparatus and a method for treating high concentration organic wastewater are provided to reduce facility investment cost, high management cost and long treatment time for second activated sludge treatment by minimizing wastewater treatment process to first physical and chemical treatments only. CONSTITUTION: The apparatus comprises an air diffuser comprising an agitator for enabling high speed agitation of 400 to 900 rpm and low speed agitation of 20 to 60 rpm using high speed agitation impeller (9) and low speed agitation impeller to perform fine air bubbling and increase substantial supply of oxygen into water, acid and base injecting devices (7,8), and coagulant supplying device (6), wherein wastewater containing high concentration organic matter is treated in a single reactor. The method comprises the steps of treating wastewater containing high concentration organic matter to a wastewater solution having pH of 2 to 3 using a mixed acid comprising 0.5 to 2.5 g/L of activated carbon, CaSO4, H2SO4 and HCl; adjusting pH of the wastewater solution to 10 to 11 using 0.5 to 2.5 g/L of Ca(OH)2 and NaOH, and treating the wastewater solution with composite basic material as selectively using 1.0 to 3.0 g/L of Al2(SO4)3·18H2O, FeCl3, NaHSO3 and NaClO; performing high speed agitation of 400 to 900 rpm and low speed agitation of 20 to 60 rpm as injecting about 6 to 30 g/m¬3 of cationic polymer coagulant into the wastewater solution; and performing air bubbling using an air diffuser for increasing dissolved oxygen in water so that the organic matter contained wastewater is treated only by physical and chemical treatments without activated sludge treatment.

Description

The method and equipment of wastewater treatment contained organic compound of high concentration}

The present invention relates to a wastewater treatment apparatus and method for wastewater containing high concentration organic matter, and more specifically, a single reaction treatment tank for dyeing wastewater, leather wastewater, food wastewater (tofu, fish cake, etc.) and plating wastewater containing high concentration organic matter. The present invention relates to a device and a method for treating a complex acid, a complex base, a high speed stirring, and a sufficient oxygen supply to treat only a first physical and chemical treatment without a second biological treatment.

In general, wastewater containing a high concentration of organic matter is neutralized with primary acids and bases, and then, to lower chemical oxygen demand (COD), biological oxygen demand (BOD), total phosphorus (TP) and total nitrogen (TN). In the activated sludge process, which is essentially a secondary biological treatment, organic matter has been decomposed and removed by microorganisms. However, microorganisms have a problem that normal treatment is difficult, such as easy death if nutrient input, pH, temperature, etc. are not managed, and also as a primary treatment facility, mixing tank, neutralization tank, oxidation tank 1, 2, reduction In addition to the need for many treatment tanks such as tanks, reactors, flocculation tanks, settling tanks and thickening tanks, at least four to ten secondary aeration facilities should be provided in proportion to the amount of water to be treated. There was a problem in that enormous economic costs are required.

The present invention minimizes the wastewater treatment process to only the first physical and chemical treatment in order to solve the above problems, and treats wastewater containing organic matters, thereby enormous facility investment cost, high management cost and long time for the second activated sludge treatment. It is an object of the invention to reduce the processing time of the. In order to achieve the above object, the present invention is a wastewater treatment line composed of a batch type single reaction treatment tank. Physically promoting decomposition and ionization of organic matter by kinetic energy to induce hydrolysis of organic matter and forming a colloidal phase as a reaction product, and the air injected from an acid pipe increases the absorption of oxygen in water to the maximum. Treatment with a diaphragm capable of controlling the flow of the diffuser and aeration to disperse the aeration, and reacting precipitates formed as decomposition and ionization of the organic matter in the water, giving optimum agglomeration conditions at a low speed stirring of 20 rpm to 60 rpm to aggregate them as polymer coagulants. It is characterized by the step of removing.

1 is an overall configuration of the wastewater treatment apparatus applied to the present invention

Figure 2 is a schematic diagram of a reaction treatment tank applied to the present invention

Figure 3 is a detailed view of the reaction treatment tank applied to the present invention

<Explanation of symbols for main parts of drawing>

1: Raw water collecting tank 2: Screen 3: Reaction treatment tank

4: sedimentation tank 5: sludge concentration tank 6: flocculant input device

7 acid input device 8 base input device 9 high speed stirring impeller

DESCRIPTION OF SYMBOLS 10 Slow-stirring impeller 11 Diffusion engine 12 Horizontal diaphragm for movement control of bubble

13: air floating direction

Hereinafter, described in detail by the accompanying drawings as follows.

1 is an overall configuration diagram of a wastewater treatment apparatus applied to the present invention, FIG. 2 is a schematic diagram of a reaction treatment tank applied to the present invention, and FIG. 3 is a detailed diagram applied to the present invention. The reaction treatment tank applied to the present invention is composed of a batch type single tank, and removes solid organic and inorganic foreign substances through a screen until the reaction treatment tank is filled, and receives a certain amount of raw water. When the reaction treatment tank is full, the raw water is transferred step by step to the next reaction treatment tank in the atmosphere. The reaction treatment tank which is already full is decomposed and removed under chemical conditions by introducing complex acid and complex base according to the type of waste water.

The process of dyeing wastewater, leather wastewater and food wastewater is as follows. Depending on the raw water concentration, 0.5 ~ 2.5 g / ℓ of activated carbon is added to adsorb unnecessary components, and the main component is CaSO by high speed stirring, air bubbling and aeration at about 400 ~ 900rpm for about 30 minutes to 1 hour. _The pH is adjusted to 2-3 with a complex acid composed of ₄ and H ₂ SO ₄ , HCI. Next, 0.5 to 4.0 g / l of Ca (OH) ₂ is added to react, and the pH is increased to 10 to 11 with NaOH. 1.0-3.5 g / l of AI ₂ (SO ₄ ) ₃ .18H ₂ O is charged and neutralized with H ₂ SO ₄ while continuing air bubbling for 10 to 30 minutes. About 6.5-30 g / m 3 of polymer coagulant is charged and coagulated to remove. The various wired and inorganic contaminants CI ^- and SO ₄ ^- and combined with the hydrocarbon is dissociated from the organic part is degassed is decomposed by the kinetic energy as Volatile suspended solids (VSS), a part is removed as a metal salt and a sediment do. In addition, the ammonia nitrogen is also decomposed and degassed by the physical energy, and thus, the VSS in the total suspended suspension (TSS) is greatly removed. The reaction precipitate is formed by the substitution reaction of the ionized ions, and the ionized ion forms double salt by hydrolysis, and the double salt formed reacts with the complex acid and the complex base to remove some of it by degassing, and the negative ion having a charge ( Cation) polymer coagulant is added to co-precipitate organic and inorganic precipitates and suspended solids. In order to increase dissolved oxygen in the water, the oxygen supply is increased by increasing and dispersing the residence time and aeration amount of the air injected from the acid pipe in the reaction tank. Therefore, the underwater residence time of air is usually in the range of 5 seconds to 10 seconds in a conventional wastewater treatment facility, but in the present invention, by inducing the stay in the range of 15 seconds to 30 seconds, it is simply compared with conventional treatment facilities in time. Compared by about three times in comparison, the effect is more than three times greater. The amount of aeration to increase the dissolved oxygen in the water is also a single reaction treatment tank, but the aeration amount obtained in four or more conventional reaction tanks is dispersed and supplied in a short time. For this purpose, the diffuser 11 and the transverse plate 12 specially designed are responsible for increasing the absorption of oxygen in the water by controlling the floating direction 13 of the air. Other remaining pollutants are hydrolyzed by acid and base to degas the volatile gas.At this time, fine colloidal fine precipitates (+ 0.001㎛) having positive charges were added with anionic flocculant at 20 rpm to 60 rpm for about 30 minutes. In parallel with slow stirring, fine colloidal precipitates are floccated by chemical adsorption and charge-transfer reaction to be discharged by solid-liquid separation by precipitation and a filter press. Hydrophilic-SO ₃ Na (sulfon group) included in dyeing wastewater is combined with organic compounds under acid, base and kinetic energy to precipitate and precipitate by hydrolysis, and other organic substances are decomposed as follows.

RCH ₃ COOH + SO ₃ RCH (SO ₂ OH) COOH

Carboxylic acid esters are hydrolyzed in the presence of acids and bases to change to carboxylic acids and alcohols which can be degassed and removed from the atmosphere by kinetic energy. The scheme is as follows.

Sodium stearate is a saponification to form suspended suspensions and the formed colloidal suspended solids are aggregated and removed.

The plating waste water is removed from the screen through the screen, and then the pH is controlled to 2-3 with CaSO ₄ , H ₂ SO ₄ , HCI, etc., and if hexavalent Cr ⁺ is present, NaHSO ₃ is reduced to trivalent Cr ⁺ , and CN If present, primary oxidation is with NaCIO at pH 10-11 and secondary oxidation with NaCIO at 8-9 with H ₂ SO ₄ . As the acid, H ₂ SO ₄ , CaSO ₄ , Ferrous chloride, Ferric chloride, CI metal salt, SO ₄ metal salt, HCI, etc. can be selectively used depending on the wastewater condition and produced by Ca (OH) ₂ , NaOH, etc. It forms a double salt with the dissolved ions in the reaction precipitate and adsorbs and precipitates a large part of the organic matter. Ammonia nitrogen is ionized by pH and kinetic energy to react with metal salts. Most of the gases are degassed, and trace residues form double salts. By decomposing and promoting phosphates, COD (chemical oxygen demand), BOD (biological oxygen demand), TP (total phosphorus) , TN (total nitrogen) and the like gradually decrease with the reaction time.

When described in detail with respect to the apparatus and method for treating wastewater containing a high concentration of organic material implemented by the embodiment of the present invention as described above.

Example 1 Dyeing Wastewater, Leather Wastewater, Food Wastewater

Dyeing wastewater and leather wastewater were used as typical plant wastewater, and food wastewater was taken from fish cake factory. As shown in FIG. 1, wastewater containing various organic matters is collected in the raw water collection tank 1, and various solid matters are removed through the screen 2. The removed raw water is transferred to a batch reaction tank 3. After receiving the wastewater until the water level reaches the full water level in the reaction tank, the remaining raw water is sent to the next reaction tank in the atmosphere and undergoes the same treatment process as the reaction tank that becomes the full water level. In the reaction treatment tank with already high water level, CaSO ₄ and H ₂ SO ₄ were added to the acid input device 7, the pH was adjusted to 2-3, and 0.5-2.5 g / l activated carbon was added thereto. While stirring with a high speed stirrer 9 at 400rpm to 900rpm for 1 hour and bubbling air, Ca (OH) ₂ was added in 0.5 to 2.5 g / L and the pH was adjusted to 10-11 with NaOH. 1.0 to 3.0 g / l of AI ₂ (SO ₄ ) ₃ · 18H ₂ O was added through an input device, and the mixture was slowly stirred at 20 rpm to 60 rpm for 30 minutes, and anionic polymer coagulant was about 6.5 to 30 under optimum flocculation conditions. g / ㎥ was added to the flocculation tank (4), the precipitate was transferred to the sludge concentration tank (5) and treated by solid-liquid separation.

Example 2. Electroplating Wastewater

Plating wastewater was carried out in the general manner similar to the dyeing, leather, food wastewater treatment procedure of Example 1. Stylized only hexavalent Cr ⁺ 3 is reduced to a waste water containing a Cr ⁺ NaHSO ₃ to oxidize the primary NaCIO to pH 10~11 in order to oxidize the CN, the pH adjusted to 8-9 with H ₂ SO ₄ And secondary oxidation with NaCIO. 1.0 to 3.0 g / l of AI ₂ (SO ₄ ) ₃ · 18H ₂ O was added according to the concentration, and after 30 minutes at 60 rpm to 60 rpm, the low-stirring condition and the maximum flocculation conditions were adjusted. (4), it was sent to the sludge concentration tank (5), solid-liquid separation was carried out, and dehydration was carried out.

The wastewater of Example 1.2 was treated by the wastewater treatment apparatus and method according to the present invention. Treatment result of dye wastewater, Table 2. Treatment result of leather wastewater, Table 3. Treatment result of food wastewater, Table 4. The treatment result of plating wastewater is as follows.

As described above, the present invention is a physical and chemical treatment of wastewater containing high concentration organic materials with primary complex acid and complex salt, and low speed stirring to form high-speed stirring, flocculation and colloidal suspended solids within the range of 400 rpm to 900 rpm. Significant economic cost savings by enabling decomposition of organics and precipitation using organic acid devices designed to increase dissolved oxygen in water while treating them with a single batch reaction tank without secondary activated sludge treatment. And it has the effect of drastically saving the processing time and the wastewater containing the high concentration organic substance which is difficult to process normally.

Claims (2)

Agitator capable of high speed agitation of 400rpm to 900rpm and low speed agitation of 200rpm to 60rpm. A wastewater treatment system for wastewater containing high concentrations of organic and inorganic materials, comprising a flocculant supply device and designed to be treated in a single reactor. The method of claim 1, wherein the wastewater containing a high concentration of organic matter is treated with a complex acid composed of 0.5 to 2.5 g / l activated carbon, CaSO ₄ , H ₂ SO ₄ , HCI, and the like at a pH of 2 to 3; ₂ ) pH is controlled from 10 to 11 with 0.5 to 2.5 g / l and NaOH, and 1.0 to 3.0 g / l for AI ₂ (SO ₄ ) ₃ · 18H ₂ O, optionally using FeCI ₃ and NaHSO ₃ and NaCIO While treating with complex base, high speed stirring of 400rpm to 900rpm and low speed stirring of 20rpm to 60rpm, treating anionic polymer coagulant in the range of about 6-30g / m3, an acidic device designed to increase dissolved oxygen in water And air bubbling (bubbling) to treat the wastewater containing organic matter with high concentrations of organic and inorganic wastes without physical sludge treatment only by physical and chemical treatment.