KR100342671B1 - Wastewater treatment apparatus - Google Patents

Abstract

The present invention relates to a wastewater treatment apparatus. Conventionally, due to the large size and complexity of the facility and the input of a large amount of chemicals, there is a problem that not only environmental pollution but also lack of economic efficiency, and treatment efficiency is reduced.

Therefore, the present invention is supplied with raw water and medicine from the raw water inflow tank 11 and the chemical injection tank 12, and the medicine mixing tank (1) equipped with a stirrer (13) for mixing thereof; A storage tank 2 for storing the mixed water introduced from the chemical mixing tank 1; A settling tank 3 in which contaminants and suspended matters contained in the mixed water introduced from the storage tank 2 are precipitated, and discharge ports 31 and drain pipes 32 are formed at upper and lower sides thereof, respectively; An inlet 40A outside the settling tank 3 is located in the storage tank 2, and the outlet 40B has a chemical reaction unit 4 spirally wound around the reaction tube 40 formed through the settling tank 3. Wow; A carbon dioxide supply unit 5 for supplying carbon dioxide in aeration manner by forming a first acid pipe 52 and a second acid pipe 53 connected to the carbon dioxide tank 51 in the storage tank 2 and the reaction tube 40, respectively. )Wow; A baffle 61 having a vent 61A is formed in a cylindrical body whose top is blocked and opened downward in the settling tank 3, and the outlet 40B of the reaction tube 40 is centered inside the baffle 61. It is composed of a solid-liquid separator (6) characterized in that the separator 62 having an inclination angle of the ordinary light subsoil is formed on the outer side thereof, so that dissolved oils and inorganics can be treated more effectively without occupying much installation space. However, the simplicity of operation and the simplification of the equipment have the effect of achieving economic feasibility. In addition, since only the supernatant is discharged in a state where the pollutants are minimized, it also has the effect of reducing environmental pollution.

Description

Wastewater treatment apparatus

The present invention relates to a wastewater treatment apparatus, and more particularly, to improve the simplicity and efficiency of wastewater treatment without increasing the size of equipment, and also to achieve economic efficiency of operation and installation. It relates to a wastewater treatment device.

Generally, wastewater contains detergents such as surfactants and organic and inorganic substances such as nitrogen and ammonia, and its treatment is serious. The treatment method varies depending on the conditions of each discharge company. Generally, the wastewater is treated in the order of wastewater → chemical treatment → aggregation → sedimentation → filtration—discharge, followed by precipitation → dehydration → treatment.

In other words, after neutralization with acid and weakly calibrated medicines, agglomerates are formed artificially using various organic and inorganic coagulants to produce biochemical oxygen demand (BOD) and chemical oxygen demand (COD) in wastewater. The chemical oxygen demand, chromatic agents, and other heavy metals are removed by adsorption precipitation.

More specifically, the conventional wastewater treatment method is a BOD in the wastewater by artificially forming a scum using various organic and inorganic flocculants after the neutralization process with acid, alkali, etc. , COD and chromatic sources, and other heavy metals are removed by adsorptive loading springs. The flocculants include ferric salts such as alum, caustic soda and slaked lime, ferric chloride, ferric sulfate, and ferric sulfate, and liquid alumina. Various kinds of materials, such as those based on aluminum, such as PAC and PAS, are used.

However, such a conventional wastewater treatment bangbab is first, in order to remove the suspended substances entering the wastewater in the primary sedimentation tank should be about 6 hours or more of the amount of inflow water, and the apparatus and structure have to be enlarged. There was a problem that the device is complicated because the preparation of drugs such as flocculant for each property and the residence time and secondary sedimentation tank are required.

Secondly, cohesion. In most cases, the removal efficiency of COD and color is only about 30 to 40%, and the post-treatment process, which requires passing through a separate filtration device, is required in order to meet the emission allowance standard of the Water Quality Preservation Act. There was this.

Third, if the pH is more than 10, not only the pH should be adjusted so that it can be aggregated and precipitated by adding an acid such as sulfuric acid, but also various organic polymers or chemical coagulants such as ferric chloride are added, Since the residual content is more than 20ppm of BOD, it has to be treated with a large amount of chemicals in order to treat it.Therefore, it is not economically economical at a huge cost, and dehydrated sludge is impossible to reduce the farmland. There was a problem weighted.

Accordingly, the present invention has been devised to solve the above-mentioned conventional problems, and its object is to increase the simplicity and efficiency of wastewater treatment without increasing the size of the equipment, and thus, It is to make installation economical.

In order to achieve the object of the present invention, the raw water and the medicine is supplied and stored from the raw water inlet tank and the chemical injection tank, the chemical mixing tank equipped with a stirrer for mixing thereof; A storage tank for storing the mixed water introduced from the chemical mixing tank; A settling tank in which pollutants and suspended solids contained in the mixed water introduced from the reservoir are settled, and outlet and drain pipes are formed at upper and lower sides thereof, respectively; A chemical reaction part in which an inlet is located in a storage tank on an outer side of the settling tank and an outlet is spirally wound around a reaction tube formed through the settling tank; A carbon dioxide supply unit configured to supply carbon dioxide in an aeration manner by forming a first acid pipe and a second acid pipe connected to the carbon dioxide tank in the storage tank and the reaction tube, respectively; A baffle having a vent is formed in a cylindrical body clogged with an upper portion of the sedimentation tank, and a separator is formed inside the baffle having a tilt angle of a normal light angle on the outside of the reaction tube. Provided is a wastewater treatment apparatus comprising a solid-liquid separator.

1 is a circuit diagram showing the overall configuration of the apparatus of the present invention.

Figure 2 is an enlarged cross-sectional view of the main part of the present invention.

3 is a cross-sectional view showing the structure of the carbon dioxide supply unit of the present invention.

* Explanation of symbols for the main parts of the drawings

1: Drug mixing tank

11: Raw water inflow tank 12: Chemical injection tank

12A: Control Panel 13: Agitator

14: first separation wall 15: second separation wall

2: reservoir

3: Precipitator

31: outlet 32: drain tube

4: Chemical reaction part

40: reaction tube 40A: inlet

40B: Exit

5: carbon dioxide supply unit

51: carbon dioxide tank 51; first acid engine

52: second acid engine 53: pressure gauge

6: solid-liquid separator

61: baffle 61A: vent

62: separate

P: Pump V: Valve

Hereinafter, the wastewater treatment method according to the present invention will be described in detail.

The present invention consists of a mixing process, a carbon dioxide injection process, a chemical reaction process and a flocculation / precipitation process.

The mixing step is a mixing step of injecting and mixing the chemicals of the slaked lime 4.0wt%, flocculant 0.1wt%, chlorine dioxide 4.8wt% in air-levaged raw water. In addition, the carbon dioxide injection process is a process of supplying carbon dioxide to the mixed water by aeration to dissolve, and the mixed water flows in a vortex for 30 seconds or more so that the mixed water dissolved carbon dioxide can react with the carbon dioxide by the process Chemical reaction process. The flocculation / precipitation process is a process of precipitating agglomerates by solid-liquid separation while allowing the contaminants and suspended solids in the dissolved state to agglomerate in the calcium carbonate by adjusting the pressure on the reactants of the calcium carbonate produced through the process.

In the present invention, when the dissolved organic matter causes the chemical reaction of hydrated lime (CaO) and carbon dioxide (CO ₂ ), the reaction of calcium carbonate (CaCO ₃ ) takes place in the limestone as the following chemical reaction at pH 10.3. The environmental source is adsorbed on the surface of the lime-lime pores when it is rapidly inhaled into the lime-lime pores together with the pollutants around the city and the reactants are suddenly produced. As the reaction with carbon dioxide is combined with dissolved pollutants through a spiral flow tube, the aggregates become macromolecules through complex steps such as adsorption, granulation, condensation, condensation and polycondensation.

Contaminants dissolved in wastewater are denatured into sludge in a short time by reaction with slaked lime, and the reaction product is the supernatant liquid separated from the sedimentation separator in the chemical reaction tank to purify with very contaminant water.

CaO + H ₂ O = Ca (OH) ₂

CO ₂ + Ca (OH) ₂ = CaCO ₃ + H ₂ O

Ca (HCO ₃ ) ₂ + Ca (OH) ₂ = 2CaCO ₃ + 2H ₂ 0

Next, the configuration of the apparatus of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a circuit diagram showing the overall configuration of the present invention, as shown in the present invention, the raw water inlet tank 11 and the slaked lime and chemical additives are stored in the air inlet raw water flows into the operation of the pump (P) The chemical injection tank 12 to be stored is provided. In addition, the raw water inflow tank 11 and the chemical mixing tank (1) for mixing the raw water and the medicine supplied from the chemical injection tank (12) is provided, the chemical mixing tank (1) has a shaft by the drive of the motor (M) The stirrer 13 which rotates and stirs raw water and chemicals supplied by rotation of the stirring blade formed in the end side of the said shaft is formed.

In addition, the chemical mixing tank 1 has a storage tank 2 into which mixed water mixed with chemicals may be introduced and stored into the first and second separation walls 14 and 15 having openings in opposite directions. It is formed, one side thereof is provided with a discharge port 31 is formed on the upper side and the lower side is provided with a hopper-shaped precipitation tank 3 is formed with a drain pipe 32 to discharge the internal precipitate to the outside. In addition, the outer side of the settling tank (3) is provided with a chemical reaction unit (4) formed by spirally winding the tube to form a reaction tube (40), the inlet (40A) of the reaction tube 40 is the reservoir (2) ), The outlet 40B is formed to penetrate into the lower part of the sedimentation tank 3, and the mixed water stored in the storage tank 2 is vortexed by the operation of the pump P to vortex the inside of the sedimentation tank 3. It is configured to be discharged to.

In addition, a carbon dioxide supply unit 5 including a carbon dioxide tank 51 and first and second acid engines 52 and 53 so as to inject carbon dioxide into the reservoir 2 and the reaction tube 40 is provided. The first and second acid pipes 52 and 53 are located in the reservoir 2 and the reaction tube 40 as shown in FIG. 3 to inject carbon dioxide into the mixed water mixed with slaked lime and chemicals by aeration. It is configured to react with each other.

In addition, in the settling tank 3, the separator 62 is inclined in a cross section of 15 ° outside the outlet 40B of the reaction tube 40 so as to separate and settle the aggregate as shown in FIG. 2. Is formed, and the outer side thereof is provided with a baffle 61 of cylindrical body having a vent 61A at the top center and opened downward. Here, reference numeral P is a pump, V is a valve, 12A is a control panel, and 54 is a pressure gauge.

The present invention configured as described above, first, the raw water is introduced into the raw water inlet to the raw water inlet tank 11 by the operation of the pump (P) inlet and stored, and the slaked lime stored in the raw water and the chemical injection tank 12 And the chemical additives are again supplied into the chemical mixing tank 1 and mixed with each other by the stirrer 13. In addition, the mixed water flows back into the storage tank 2 through the openings of the first separation wall 14 and the second separation wall 15, and then, the reaction tube is wound spirally on the outside of the settling tank 3 ( While vortexing through 40, the carbon dioxide is injected and reacted from the carbon dioxide tank 51 through the first acid pipe 52 and the second acid pipe 53, and the intake of the pollutant occurs quickly, and by the reaction As the calcium carbonate is adsorbed with the surrounding particles, the polymer condensation reaction occurs simultaneously with the administration of the polymer anionic chemical additive.

Accordingly, the removal of dissolved oils and minerals in the wastewater is effectively and quickly performed, and the BOD and COD decreases below the standard value, and the color is greatly reduced so that no odor is generated. The water quality of Dongducheon sewage is shown in Table 1.

Average result of sewage treatment water operation Water quality / division Wastewater After carbon dioxide reaction treatment PH 10.1 7.0 to 7.2 COD 110.3 14.2 BOD 83.3 9.6

And the raw water introduced into the sedimentation tank 3 is flowed back as shown in Figure 2 while the pressure is lowered while passing through the separator 62 formed in the 15 ° inclined section, the pressure is again moved to the baffle 61 side As it is lowered, a smooth separation of the flocculating sediment is made, and only the supernatant water from which the contaminants are removed is discharged to the outside through the outlet 31 by the operation of the pump P.

<Example 1>

First, the raw water flowing into the raw water inflow tank 11 is inlet water in which the compressed air is air-lifted at a speed of 1.1 m ³ per minute with a power of 0.5 HP, 4.0 wt% of lime, 0.1 wt% of flocculant, and 4.8 wt% of In the chemical mixing tank 1 together with the carbon dioxide, the agitator 13 is stirred at a speed of 150 rpm. In addition, sulfonic acid anionic organic polymer coagulant is used as the polymer coagulant.

And the introduced waste water is the reaction tube 40 and the storage tank spirally wound in the settling tank 3 at a rate of 10 l / mim from the carbon dioxide tank 51 through the first acid pipe 52 and the second acid pipe 53. Carbon dioxide is injected into (2), and the mixture is sufficiently stirred and mixed with the slaked lime to produce a reactant of calcium carbonate while the pH is changed to neutral.

As such, the reaction product precipitates rapidly as the macromolecule is formed by causing a polycondensation reaction with flocculation, binding and addition of a coagulant of a polymer to dissolve the suspended solids to induce solid-liquid separation. By the drain pipe 32 is periodically discharged.

Accordingly, the present invention, by injecting a smaller amount of flocculant than in the prior art, the organic matter is precipitated by reaction and flocculation, which not only increases the efficiency of the treatment but also has the effect of removing odor and improving turbidity. . In addition, the sedimentation tank (3) of the present invention can achieve the rapidity of sedimentation by separating the solids of the macromolecular soluble material and the supernatant water, and the sedimented sludge is a raw water collection tank (not shown) by an automatic operation pump. And the solids can be removed.

<Example 2>

According to the present invention, when the amount of wastewater 10 tons / hour is used in the chemical additive administered in Example 1, 10 l / min of carbon dioxide must be chemically reacted for about 30 seconds to neutralize the pH of the wastewater to 7. Wastewater, which undergoes chemical reactions with carbon dioxide, coagulates with surrounding suspended solids as dissolved organic matter is attached and removed along with precipitates of calcium carbonate due to rapid chemical reactions. It is precipitated, in which the precipitate is rapidly settled within about 20 seconds.

Table 2 shows the results of processing the chemical plant wastewater generated in Yangju-gun, Gyeonggi-do using a reaction tube 40 wound in a spiral shape in a sedimentation tank, and shows the removal efficiency of BOD, COD, and chromaticity, and is 20-30% compared to the prior art. The removal efficiency was found to be excellent.

Average result of wastewater operation COD (ppm) BOD (ppm) Suspended solids (ppm) Chromaticity Turbidity (NTU) enemy 25.6 31.0 45.2 310 10.0 Treated water 6.0 5.8 8.2 37 1.8 Processing efficiency (%) 76.5 81.2 81.8 88.0 82.0

Table 3 shows the results of treatment of the samples of domestic sewage collected at Uijeongbu sewage treatment plant by the method according to the present invention, which shows 80% or more of the treatment effect.

Average result of driving sewage pH COD (ppm) BOD (ppm) Suspended solids (ppm) Turbidity (NTU) enemy 10.2 81.1 69.2 84.2 9.2 Treated water 7.2 12.7 9.8 11.3 1.3 Processing efficiency (%) 84.3 85.8 86.5 85.8

As shown in the above table, it can be seen that the effluent of the wastewater treated by the method according to the present invention has an excellent improvement in the degree of purification in BOD, COD and chromaticity. Coagulation through reaction with carbon dioxide, which has been used primarily as an adjuvant for precipitation. It was not used directly in the precipitation process. The present inventors have found that COD and BOD are remarkably improved not only in chemical wastewater, but also in leather wastewater and dye wastewater using carbon dioxide and slaked lime.

<Example 3>

In the present invention, when the reaction tube 40 treats 4m ³ / hr, the 2-inch pipe is wound in a spiral form on the outside of the settling tank 3 having a 1.5m diameter to allow the wastewater to flow. Its total length is 23m, and stays in the storage tank (2) and the reaction tube (40) for 30 seconds or more and then flows into the settling tank (3) so that the coagulation sedimentation is made in the bottom of the settling tank (3), 30 seconds or more When the reaction of carbon dioxide and slaked lime, the pH was neutralized to 6-7, and the formation of aggregates was visually distinguishable.

<Example 4>

Table 4 compares the operating costs of the coagulant currently injected for the dyeing wastewater treatment of 500m ³ / hr and the cloud shape of the coagulation treatment result using carbon dioxide.

As a result of applying the treatment method according to the present invention to a dyeing company in Dongducheon for one month, it can be seen that it brings about a significant cost reduction when compared to the chemical cost of the conventional treatment method. This is due to the significant decrease in the use of drugs such as ferric sulfate, which is a conventional coagulant addition agent.

Comparison of Wastewater Treatment Costs Existing Aggregate Treatment Facility Carbon Dioxide Treatment Facility Additive name Usage (kg) / month Cost (KRW) / month Additive name Usage (kg) / month Cost (KRW) / month Ferric sulfate 73,000 5,617,800 Slaked lime 13,500 2,025,000 Sulfuric acid (for neutralization) 2,240 616,000 Chemical additives 135 540,000 Slaked lime 18,500 2,415,400 Chlorine Dioxide 1,080 32,400 Antifoam 760 988,000 carbon dioxide 2,250 405,000 Sum 9,637,200 Sum 3,002,400

As shown in Table 4 above, when it is based on one month, the operating cost can be processed at a cost of about one third of the existing treatment cost, which is excellent in economic efficiency.

As described above, the present invention can effectively dissolve dissolved oils and minerals without occupying a lot of installation space by applying spirally wound reaction tubes to the sedimentation tank, as well as simplifying the operation and simplifying the equipment. Will have the effect. In addition, since only the supernatant is discharged in a state where the pollutants are minimized, it also has the effect of reducing environmental pollution.

Claims (2)

A medicine mixing tank 1, in which raw water and medicine are supplied and stored from the raw water inflow tank 11 and the chemical injection tank 12, and equipped with a stirrer 13 for mixing thereof; A storage tank 2 for storing the mixed water introduced from the chemical mixing tank 1; A settling tank 3 in which contaminants and suspended matters contained in the mixed water introduced from the storage tank 2 are precipitated, and discharge ports 31 and drain pipes 32 are formed at upper and lower sides thereof, respectively; An inlet 40A outside the settling tank 3 is located in the storage tank 2, and the outlet 40B has a chemical reaction unit 4 spirally wound around the reaction tube 40 formed through the settling tank 3. Wow; A carbon dioxide supply unit 5 for supplying carbon dioxide in aeration manner by forming a first acid pipe 52 and a second acid pipe 53 connected to the carbon dioxide tank 51 in the storage tank 2 and the reaction tube 40, respectively. )Wow; A baffle 61 having a vent 61A is formed in a cylindrical body whose top is blocked and opened downward in the settling tank 3, and the outlet 40B of the reaction tube 40 is centered inside the baffle 61. The wastewater treatment apparatus, characterized in that consisting of a solid-liquid separator (6) characterized in that the separator (62) having an inclination angle of the ordinary light subsidiary on the outside thereof. delete