KR920009788B1 - Carbon absorbent filter and biological waste water treating method by it - Google Patents

Abstract

A polymeriv contact filtering material is manufactured by (1) packing carbon-based porous absorbent (bio-coal) into the filtering material made of a synthetic resin (polyvinyl chloride, polyethylene etc.) and (2) forming slime layer composed of microbes to the surface of the packed filtering material. The porous absorbent is obtained by acid-treating and pulverizing coal coke. The organic waste water is efficiently treated by using the contact filtering material in combination with an activated sludge process and a slime method.

Description

Carbon-based Adsorbent Filling Contact Media and Biological Wastewater Treatment

1 is a schematic diagram of the biofilm metabolism of the method of the present invention.

2 is a plan view of the contact medium of the present invention.

3 is a cross-sectional view taken along line A-A 'of the contact medium of the present invention.

4 is a relationship paint with the retention time of the retention period of the filling aeration tank of the contact medium of the present invention.

The present invention relates to a carbon-based adsorbent-filled contact media and a method for treating biological wastewater using the same, and in particular, a method for treating biological wastewater and sewage using a contact media having a carbon-based porous adsorbent in a mixed method of an activated sludge method and a biofilm method. It is about contact media.

As a prior art, Korean Patent Publication No. 87-1996 describes wastewater treatment using an activated sludge method, and Korean Patent Publication Nos. 88-150 and 88-151 (Suyongyang Co., Ltd.) The aeration type advanced wastewater treatment system describes the aeration type advanced wastewater treatment system which can efficiently process high concentration organic wastewater in a short time by the biofilm filtration tank filled with aeration tank, storage tank and ceramic granular material. Patent Publication No. 87-1997 (Biofilter, the inventor of Shimoi-Youichi Applicant, Sunkyung Construction Co., Ltd.) relates to a biological filter that can attach a biofilm to purify wastewater, and the wastewater of Japanese Patent Application Publication No. 55-84591. The treatment apparatus is characterized in that the wastewater treatment is characterized in that the carrier (5) to which microorganisms are adhered is made of synthetic resin (b) containing dispersed granular activated carbon (a). As a value which is one to be removed by placing the carrier it is adhered to the wastewater microorganisms decomposing organic matter in waste water biologically.

The present invention is a method of mixing the activated sludge method and the biofilm method among the conventional biological wastewater treatment methods, and using a carbon-based adsorption, decolorization, and porosity to form and attach a biofilm (Slime) layer formed as a microorganism on the surface of a PVC contact medium. The present invention provides a biological wastewater treatment method which doubles the effect and at the same time balances the characteristics of the carbonaceous system and the biofilm, and a contact medium having a carbonaceous adsorbent used in the present invention.

In the biofilm method, the microbial phase of the biofilm is very rich in protozoa and in particular, is predominantly ciliated. In activated sludge, organic matter is ingested by bacteria and fungi, and these microorganisms are more active in biofilms. Protists and welfare animals also play an important role in purification.

On the other hand, since the nitrifying bacteria in the biofilm are sufficiently eaten, the ammonium salt in the waste water is oxidized to nitrate, and some of the nitrate is denitrated in the anaerobic layer of the biofilm. Metabolic schematic diagram in the biofilm is shown in FIG. 1 and the method of the present invention can be said to apply the combined treatment action of these aerobic, anaerobic, anaerobic bacteria.

The carbon-based adsorbent filling contact media of the present invention is molded in the form of Figs. 2 and 3 with synthetic resin such as PVC and filled with a carbon-based adsorptive bleaching agent in its internal space, so-called bio-coal.

The carbonaceous adsorbent (one side biocoal) filled in the contact medium of the present invention is a process of coal coke.

The method of the present invention is a method of mixing the activated sludge method and the biofilm method among biological wastewater treatment methods, and using a carbon-based porous adsorption bleaching agent (hereinafter referred to as bio-coal), which is formed from synthetic resin such as PVC. Biological wastewater treatment method using a carbon-based adsorption contact media filling aeration tank that doubles the treatment effect by forming and attaching a bioslim layer composed of microorganisms on the surface of the media and at the same time balances the characteristics of the carbon-based adsorbent and the biofilm. to provide.

In another aspect, the present invention provides a contact medium filler having a carbon-based adsorbent made of a contact medium formed of a carbon-based porous adsorbent made of synthetic resin such as PVC.

The adsorbent contact media including the carbon-based adsorbent of the present invention is used by filling in an aeration tank of a biological wastewater treatment method. The biocoal of the present invention, which is a PVC contact medium having this carbon-based adsorbent, has the following characteristics.

1. Activated coal has a continuous potency effect by self-adsorption decomposition and self-determination by porosity.

2. It is semi-permanent.

3. Anaerobic, microorganisms exist in the biofilm (Slime) layer using this can be expected denitrification effect.

4. High concentration wastewater treatment is possible.

5. It can remove unpleasant smell and color.

The pilot test results of the biocoal-filled aeration method of the present invention and the conventional activated sludge method are shown in Table 1 below.

In addition, the residence time of the biocoal filling aeration tank of the present invention is shown in FIG.

In order to compare the standard activated sludge process and the bio-coal filling aeration method, the same conditions were performed.

Experimental Wastewater: Diluted Sugar Wastewater

Seedling: Sugar sludge returned 1 liter of seedlings and incubated for 3 days

Wastewater Inflow: 20ℓ / day

Aeration capacity: 40ℓ

Sedimentation tank capacity: 12ℓ

Temperature: 17-23 ℃

Dissolved oxygen: 2-5mg / ℓ

Aeration amount: 60ℓ / min

MLSS: 2500 mg / ℓ

SVI: 110

The present invention biocoal dose: 75% of the volume of the aeration tank

TABLE 1

Microorganisms appearing on the surface of the biocoal media include Aspidisca, Vorticella, Epvstilis, Carchesivm, zoorhamniun, Amoeba, and the like.

Example 1

2 and 3, the specification of the disk bonus material of elliptical cross section is set to 70ψ × 30H (mm) above and below formed of synthetic resin such as PVC, PE and the like as shown in FIG. The mixture is molded into coal coke 30-50% and roasted in a reducing salt atmosphere to obtain a carbon-based adsorption and decolorization porous material having a breaking strength of 38000 kg / m ² having numerous capillaries in carbon particles of activated carbon.

PVC media having the biocoal adsorbent of the present invention by placing the adsorbent packed in a nonwoven bag in the disc-shaped media molded article interior space between upper and lower disk media and adhering the upper and lower PVC media by high frequency bonding or the like. To prepare.

Example 2

The aeration tank of the biological sewage treatment apparatus is three tanks, and the filling rate of the biocoal filling of the present invention is 75% and the number of fillings per volume is 350 / km ³ , respectively.

The residence time of the biocoal filling aeration method as described above was as follows.

ψ = (0.33) (75 / p) (Co 0.46) × In (co / ce) HR

co: inflow BOD

Ce: Outflow BOD

p: Biocoal filling rate

When the first tank outflow BOD of the aeration tank is set to 200PPM, the residence time (ψ) in Article 1 is

ψ1 = (0.33) (75/75) (10000.46) × In (1000/200) = 12.7HR

Article 2 ψ2 = (0.33) (75/75) (2000.46) × In (200/50) = 5.2HR

Article 3 ψ3 = (0.33) (75/75) (500.46) × In (50/10) = 3.2HR

Comparative Example 1

Designed for biological treatment of food waste, including the 1st 1000m ³ that can be processed wastewater treatment methods and standards, and the residence time of the aeration tank if you need to guarantee the inflow BOD 10mg / ℓ are as follows.

end. In case of activated sludge process, the capacity and residence time of aeration tank 1000m ³ / DAY × 1000mg / 1 10 ^-3 = 1000kg BOD / DAY BOD If load is 0.3-0.5kg BOD / m DAY, aeration tank capacity is 1000kg BOD / DAY 0.3- 0.5kg BOD / 3DAY

Calculation of residence time

1000m ³ / DAY ÷ 24HR = 42m ³ / HR

2000m ³ -1200m ³ ÷ 42m ³ / HR = 47HR-28HR

2000m ³ -1200m ³ ÷ 42m ³ / HR = 47HR-28HR

As can be seen in Example 2 and Comparative Example 1 above, it can be seen that the residence time in the biocoal-filled aeration tank according to the present invention is very shortened.

According to the method of the invention,

1) The quality of discharged water is improved.

It doubles the removal efficiency of COD, BOD, SS heavy metal chromaticity (more than 80%). In addition to increasing the efficiency of the biofilm layer, the treatment efficiency is maximized by the removal of SS using the adsorption and decolorization of heavy metals or COD values.

2) It is stable to fluctuations in raw water.

It is possible to sufficiently absorb the fluctuation of the ciliary laminar flow by the biofilm layer and the load fluctuation due to the porosity, thereby maintaining stability in the aeration tank.

3) Double the effective dissolved oxygen efficiency

By using surface area and porosity (a very large surface area ratio per unit area), the efficiency of dissolved oxygen in the aeration tank can be more than doubled.

4) It is semi-permanent.

In addition, the advantages of the biocoal of the present invention

1. Reduction of driving expenses (Blower blower power cost reduction, dehydration capacity reduction)

2. There is little sludge production amount.

3. Bulking does not occur.

4. It is strong against fluctuations in quantity and concentration of influent wastewater.

5. Nitrify the nitrogen in the treated water.

6. Can respond relatively to shock of harmful substances.

7. If the capacity of existing facilities is insufficient, the capacity of existing facilities can be handled up to 2 times without facilities.

8. The quality of treated water is stable.

As can be seen from the above description and the embodiment, the contact filter filled with the carbon-based adsorbent of the present invention has a very excellent effect by using the carbon-based adsorbent which is not present in the biofilter of the prior art.

Claims (3)

Activated Coal is treated with acid with 30-50% of carbonized calorific value of 3,000KCAL / KG, dissolves 70-75% of ash content, and processes TAR and toxic components at the same time by processing into particles of 4-5MESH. Synthetic resin biofilm contact medium filled with removed porous coal and high density polypropylene (HDP) media. Biological sewage treatment method in which biological sludge treatment is a mixture of an activated sludge method and a biofilm method, and COAL is filled to form a biofilm (SLIME) layer composed of microorganisms on the surface of the contact medium. A method of treating biological wastewater, in which liquids come into contact with microorganisms attached to activated coal when used as a scrubber filler and oxidize the organic substances therein.

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