KR920000949B1 - Waste water treating apparatus - Google Patents

Abstract

The system treats waste water within an electrolytic and precipitating type tank, with ions being adjusted therein, and is capable of precipitating both organic and inorganic materials. Waste water is introduced into an ion reaction tank is provided with a pair of electrodes made of copper and coated with a high conductivity corrosion resistant metal. The ions are made to be gathered to the electrodes by using an airblower, and the ionic materials coagulate to facilitate precipitation.

Description

Electrolytic Sedimentation Wastewater Treatment System

1 is a system diagram of the apparatus of the present invention,

Figure 2a is a perspective view of the charge reaction body of the present invention, (b) is a connection diagram of the electrical components embedded in the charge control box of the charge reactor.

3 is a cross-sectional view of the charge reaction body of the present invention.

* Explanation of symbols for the main parts of the drawings

1: charge reactor 2: reaction base

3: broa 4: sedimentation tank

5: concentration tank 6: diffuser

20: charge control box 22: electrode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to wastewater treatment of organic and inorganic materials, in particular electrolytic precipitation type wastewater treatment apparatus for wastewater with controlled charge.

In wastewater treatment, treated water obtained by primary treatment (chemical treatment) and secondary treatment (biological treatment) may have low concentrations of suspended solids when visually observed, but in fact, high chemical oxygen demand (COD) and biological oxygen demand Because it contains dissolved organic matter (BOD), organic matter concentration, suspended solids concentration and chromaticity are high, and their purification or treatment poses an important problem in the design of wastewater treatment process.

Usually these treated waters are recycled to the wastewater treatment process or chemically and biologically treated by conventional methods. According to known techniques, organic and inorganic substances in wastewater can be chemically treated with flocculants or only physically and biologically.

According to the process of the present invention, the coagulation is possible only by the electroprecipitation treatment that controls the charge without administering the flocculant during the wastewater aggregation reaction, and the biological oxygen demand (BOD) and the color of the treated solution are sufficiently reduced and simultaneously It was found that the treatment speed was increased by maintaining a constant electrolytic concentration due to the action and aeration.

Hereinafter, the process of the present invention is carried out by the following steps will be described according to the accompanying drawings.

(A) The supernatant, which has been chemically or biologically treated, is introduced into the supernatant in the charge reaction tank (1), and (B) the mixture in the aeration charge reaction tank (1) is under a reactor (2) containing charge for about 1 hour. While maintaining the residence time, the mixture is sufficiently mixed by the gas of the air blower (3) to maintain the charge content of negative and positive (-) (+) dissolved in the electrolytic coagulation (condensation). ) The mixture mentioned above is sent to the settling tank (4) to separate the precipitated sludge, (D) the sludge is transferred to the thickening tank (5) for dehydration, and (e) the homologous water separated from the settling tank (4) is discharged. Let's do it.

Treated liquors are obtained by chemical or biological treatment of inorganic and organic wastewater by known methods. This solution is obtained by vacuum filtration, centrifugation, gravity sedimentation, flocculation sedimentation or biological treatment.

The biological treatment system of the conventional wastewater treatment process employs a treatment speed in the range of 0.1 kg to 0.3 kg of BOD for 1 kg of mixed liquid BOD per day.

According to the process of the present invention it can be processed at a much faster speed than the conventional treatment rate without reducing the BOD removal efficiency by microbial culture. For example, BOD after removal of 13 mg / L of BOD after treatment with 66 mg / L of fiber wastewater effluent per day was 80%.

In carrying out the process of the present invention, the treatment rate is BOD up to about 0.00792 kg with a BOD of 66 mg / L and a reaction volume of 8 L for a 120 L mixed liquid.

The supernatant is continuously allowed to remain for 1 hour so that the charge in the positive electrode (+) of the electrolytic reaction tank 1 can sufficiently run the ionic component. In order to maintain the electrolyte concentration of the negative electrode (-) and the charge reaction tank (1) of the charged reactor (2) sufficiently, stirring is applied to an acid pipe (3) of a gas containing oxygen. This can be easily accomplished by using the broa 3.

The pH range in the electrolytic reactor 1 is maintained at 5.8-8.6. The charge anode (+) and the cathode (-) may maintain a cohesive force of a constant charge caused by colloidal particles and aeration in the interaction of anions and cations. If foaming occurs in the upper part of the electrolytic reaction tank 1 during physical treatment, 1-3 ppm of the antifoaming agent of the emulsion system may be added. Reference numeral 11 in the accompanying drawings indicates an untreated wastewater inlet, 12 is a partition, and 13 is an outlet. Reference numeral 20 is a charge control box attached to the reactor 2, 21 is an insulator, and 22 is an electrode. Reference numeral 23 denotes a magnet that is electrically bound in the charge control box 20, 24 denotes a fuse box, 25 denotes a white line circuit breaker, 26 denotes a resistor, and 27 denotes a lamp.

The following examples will more clearly illustrate the present invention.

Example 1

Physical treatment by charge reaction of supernatant after primary treatment, semiconductor chemical wastewater

Analyzing the mixed liquid in which the original wastewater was chemically agglomerated and the supernatant was aerated for 20 minutes at 20 ° C. by an aerobic aeration.

BOD ₅ 40.2mg / ℓ

COD 95.3 mg / l

SS 47.5 mg / l

The supernatant is pumped and maintained continuously at a pH of 6.8-8.6 at a constant rate of 120 l per day, with a volume of 8 l, charge controlled reactor (1). The residence time in the reactor 1 is 1.5 hours.

The reactor 1 is equipped with an electroreactor 2 and an diffuser 6 which disperses the mixture immediately below the reactor.

Filling the waste water in the reactor (1) and then passing the electricity through the electrode to make the colloidal particles to give electricity and accelerate the settling to the solid by the interaction to accelerate the precipitation. As a result, the supernatant can be discharged in a state in which organic matter, inorganic matter and non-organic substances are removed.

The treatment rate is 0.00482 kg / l BOD ₅ for 120 l waste water per day.

Treatment and standing The precipitated filtrate is continuously removed by overflowing from the settling tank 4. If you analyze this amount,

BOD ₅ 12mg / ℓ

COD 36.6 mg / l

SS 6.6mg / ℓ

The BOD ₅ reduction in the solution is 70.1%, the COD reduction is 61.9%, and the SS reduction is 86.1%.

Example 2

Physical treatment by charge reaction of supernatant after biological treatment of fiber wastewater.

Analyzing the mixed liquid in which the original wastewater aerated biologically treated supernatant at 20 ° C. for 40 minutes by aerobic aeration,

BOD ₅ 66mg / ℓ

COD 157.1 mg / l

SS 92.5 mg / ℓ

520 degrees chromaticity

The supernatant is pumped continuously to an 8 L charge controlled reactor 1 maintained at pH 6.8-8.6 at a constant rate of 120 L per day. The residence time in the reactor 1 is 1.5 hours.

The reactor 1 is equipped with an electroreactor 2 and an diffuser 6 which disperses the mixture immediately below the reactor.

Filling the waste water in the reactor (1) and then passing the electricity through the electrode, the colloidal particles are charged and promotes the condensation to a solid by interaction to accelerate the precipitation. As a result, the supernatant can be discharged in a state where organic matter, inorganic matter, and suspended solids are removed.

The treatment rate is 0.00792 kg BOD ₅ for 120 l waste water per day.

The treated and settled filtrate is continuously removed by overflowing from the settling tank 4. If you analyze this amount,

BOD ₅ 13 mg / ℓ

COD 60.2 mg / l

SS 15.3 mg / l

290 degrees of chromaticity

The BOD ₅ reduction in the solution is 80%, the COD reduction is 61.7%, the SS reduction is 83% and the chromaticity is reduced by 43.3%.

Example 3

Physical treatment by charge reaction of supernatant after biological treatment of silk fiber wastewater

Analyzing the mixed liquid in which the original wastewater aerated biologically treated supernatant at 20 ° C. for 40 minutes by aerobic aeration,

BOD ₅ 31mg / ℓ

COD 96.3 mg / l

SS 84.7 mg / l

The supernatant is pumped continuously into a controlled reactor (1) of 8 liters which is maintained at pH 6.8-8.6 at a constant rate of 120 liters per day. The residence time in the reactor 1 is 1.5 hours.

The reactor 1 is equipped with an electroreactor 2 and an diffuser 6 which disperses the mixture immediately below the reactor.

When the reactor is filled with wastewater and an electric current flows through the electrode, the colloidal particles are charged with electricity, which accelerates the condensation to a solid by interaction. As a result, the supernatant can be discharged in a state where organic matter, inorganic matter, and suspended solids are removed.

The treatment rate is 0.00372 kg of BOD ₅ for 120 liters of wastewater per day.

The treated and settled filtrate is continuously removed by overflowing the settling bath. If you analyze this amount,

BOD ₅ 6.4 mg / ℓ

COD 54.2 mg / l

SS 18mg / ℓ

The BOD ₅ reduction of the liquid was 79%, the COD reduction was 44%, and the SS reduction was 78.7%.

Claims (1)

The electrolytic positive electrode which can be accommodated in the charge reactor into which untreated wastewater flows in has a high electrical conductivity and is installed vertically with a coated copper electrode rod to prevent corrosion. Electrolytic sedimentation wastewater treatment apparatus characterized in that the charge is transferred to the electric positive electrode to form a jelly phase.

Images