KR20000013589A - Sewage merge-purifying treatment apparatus - Google Patents

Abstract

PURPOSE: A sewage merge-treatment apparatus merges the sewage from a wash-down water closet with the sewage from a bathroom and a kitchen and purifies the merged sewage. CONSTITUTION: A sewage merge-treatment apparatus comprises:a first aeration tank(2) for first sedimentation and anaerobic decomposition of contaminants and denitrification of a sludge transferred from a final sedimentation tank(10); a second aeration tank(4) for second anaerobic decomposition and denitrification of the inlet contaminants; an aeration tank(6) for aerobic oxidation of the contaminants with air supplied through an oxygen pipe(24); a contact oxidation tank(8) for removing the contaminants with bacterium living in a sheet-shaped bio-house having a large specific surface area; the final sedimentation tank for sedimentation of the sludge released from the bio-house; and a biomembrane filtration tank(32) for removing fine floc not precipitated in the final sedimentation tank.

Description

Household sewage treatment system

The present invention relates to a living sewage combined purification treatment apparatus, and more particularly, to a living sewage combined purification treatment apparatus which merges and purifies sewage discharged from a general household and sewage discharged from a bathroom and a kitchen.

In general, household sewage discharged from existing homes is mostly processed by sewage treatment plants, but in farms, fishing villages and suburban areas, sewage discharged from buildings with less than 1,600㎡ is treated with manure only. The discharged sewage is left untreated and pollutes the rivers as well as the water supply areas.

In large cities, most of the sewage flows into the sewage treatment plants, causing the streams to become dry and destroying ecosystems.

In addition, nitrogen and phosphorus contained in large amounts of filthy water in the flushing room are discharged without removing phosphorus, causing eutrophication of the stream and consuming dissolved oxygen, causing many side effects such as aquatic animals and plants.

In order to remedy these problems, the Act on Sewage, Manure and Livestock Wastewater Treatment was amended in March 1997, and from 1998, a merger septic tank was mandated to treat household sewage below BOD 20PPM, mainly in water supply protection areas. From year on, it will be extended to all regions.

The Ministry of Environment is preparing for strengthening regulations to discharge BOD below 10PPM in businesses within 1km from major rivers and appeals of water supply protection area.

Due to the strengthening of environmental regulations, septic tanks are being installed and installed to treat sewage discharged from flush toilets, kitchens, and bathhouses. However, due to fluctuations in treatment efficiency, they are discharged without proper treatment.

Conventional sewage treatment methods include flow regulating contact aeration method and suspension microorganism method, and the flow regulating contact aeration method equalizes inflow of water in the flow regulating tank, and removes contaminants by biofilm attached to the contact material in the contact aeration tank Membrane is removed from the settling tank.

Suspension microorganism method consists of flow control 1st, 2nd, 3rd and 4th contact aeration tank and installs HBC (Hanging Bio Contactor) Ring in the aeration tank to form a biofilm to remove organic matter by microorganism.

The two treatment methods described above are unstable to kitchen sewage with high BOD load fluctuations, resulting in unstable water quality.

In addition, the removal rate of nutrients such as nitrogen and phosphorus is low, which causes eutrophication of the river, and due to the large number of sludges, it is necessary to clean frequently.

Therefore, the present invention has been made to solve the above problems, an object of the present invention is to merge high-efficiency living sewage treatment of contaminants in sewage by anaerobic and aerobic microorganisms and final treatment of untreated contaminants in a biofilm filtration tank. It is to provide a purification treatment device.

In order to realize the object of the present invention as described above, the first anaerobic tank for decomposing contaminants firstly and anaerobic decomposition and denitrified conveyed sludge in the final sedimentation tank, and the second anaerobic decomposition and denitrification for incoming contaminants secondary (2) an anaerobic tank, an aeration tank for supplying air through an acid pipe to aerobic oxidation of contaminants, a contact oxidation tank for removing contaminants by proliferating microorganisms in a bio-housing with a large specific surface area, and a contact material. Provided are a final settling tank for settling the sludge removed, and a biofilm filtration tank for removing the fine floc that does not settle by the biofilm installed on top of the final settling tank.

1 is a plan cross-sectional view of the living sewage combined purification treatment apparatus according to the present invention.

Figure 2 is a side cross-sectional view of the living sewage combined purification treatment apparatus according to the present invention.

3 is a perspective view of a microbial contact material provided in the living sewage treatment system according to the present invention.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in more detail.

1 is a cross-sectional view of the living sewage treatment system according to the present invention, and FIG. 2 is a side cross-sectional view of FIG. 1, wherein the sewage treatment system according to the present invention decomposes contaminants into sedimentation and anaerobic denitrification and denitrates sludge. The first and second anaerobic tanks (2) and (4), the aeration tank (6) for oxidizing and decomposing the organic matter passed through the second anaerobic tank (4) by floating microorganisms, and the growth of the microorganisms in the contact material A contact oxidation tank (8) for removing contaminants, a final settling tank (10) through which the sludge desorbed from the contact material is precipitated, and a filtration tank (12) for filtering organic matter passing through the final settling tank (10). do.

In the first anaerobic tank (2), precipitation and removal of contaminants mixed in domestic sewage and solid substances of sedimentable size occur, and at the same time, anaerobic decomposition of organic substances by anaerobic microorganisms occurs.

Inflow of the first anaerobic tank (2) of sewage is made by the inlet pipe (14), and the sewage through the inlet pipe (14) is suspended in the above-mentioned first anaerobic tank (2) by the inflow flow rate. Inflow through the inlet conveyance (16) to prevent re-injury.

Prevention of resuspension of such a float can be achieved by forming the end conveyance table 16 of the inlet pipe 14 as an inclined surface.

In addition, in the first anaerobic tank 2, the denitrification reaction of the sludge conveyed from the final settling tank 10 by the sludge conveying pipe 18 occurs.

The to-be-processed object via the said 1st anaerobic tank 2 flows into the 2nd anaerobic tank 4 via the conveyance pipe 22 installed in the anaerobic tank separation wall 20 upper part.

The treated material introduced into the second anaerobic tank 4 again undergoes anaerobic decomposition and denitrification at the same time.

The volume ratio of the first anaerobic tank 2 and the second anaerobic tank 4 is preferably 2: 1 to maintain good efficiency.

The sewage through the second anaerobic tank 4 is transferred to the aeration tank 6 by a transfer pipe 26 installed on the aeration tank separation wall 24.

The structure of the conveying pipe 26 is located at 1/5 of the depth so as to prevent the inflow of the scum (lids, dregs formed by lumping or drying of thick liquids) and the settling precipitate. It has a T-shaped tube structure located at 1/2 of the water depth.

Sewage retention in the first and second anaerobic baths (2) (4) requires time for denitrification and anaerobic digestion to become adequate.

Such time may be preferably around 1.5 days.

Sewage supplied to the aeration tank 6 maintains an aerobic state due to the air supplied through the diffuser 29 by the blower 28.

In this way, since air is supplied through the diffuser 29, in the aeration tank 6, the fine bubbles form a swirl flow by the oxygen transfer process and synergism, so that the organic matter and oxygen concentration in the aeration tank 6 are uniformly distributed and floated. Oxidize organics by microorganisms.

Sewage in this aeration tank 6 needs time to grow by reacting microorganisms and organic matter.

Such residence time may preferably be a time around 0.6 days.

The organic material passed through the aeration tank 6 is transferred to the contact oxidation tank 8 through the transfer pipe 30.

The contact oxidation tank 8 has a microbial contact material 32 for oxidatively decomposing organic matter by microorganisms, which microbial contact material 32 is easy to attach microorganisms and does not affect the flow of water flow. As shown in the figure consists of a plurality of plate-like structure, it is preferable to install in a direction orthogonal to the diffuser 34.

In addition, the aeration tank 6 is supplied with oxygen through the diffuser 35 by the blower 28. The sewage supplied with oxygen maintains high dissolved oxygen when introduced into the contact oxidation tank 8. One contact oxidizing tank (8) is made so that the microorganisms can be grown even in the dead zone where oxygen is not supplied.

For the growth of these microorganisms, the volume ratio of the aeration tank 6 and the contact oxidation tank 8 should be about 6: 4.

The microbial contact material 32 according to the present invention is formed by compression molding waste vinyl. The surface is irregularly formed with large and small protrusions produced during the manufacturing process, so that the adsorption of organic matter and microorganisms is easy and the pores are large, so that oxygen Since the supply is smooth, the biodegradation of the biofilm, which is a disadvantage of the catalytic oxidation method, is prevented, and the discharged water quality provides a stable treatment efficiency of less than 10 BPM.

In addition, since the specific surface area per unit volume is large, the amount of microbial adhesion is high, and the installation cost is low.

In addition, the recycled waste vinyl can be reduced in price and recycled waste, thereby reducing environmental pollution as an environmentally friendly material.

The microbial contact material 32 has a good effect in terms of oxidative decomposition removal efficiency and economical efficiency of the organic material in a thickness of approximately 1cm around.

In addition, the wastewater retention time in the above-described contact oxidation tank 8 is preferably about 0.4 days, since it can reduce the growth of microorganisms.

The sludge desorbed from the contact oxidation tank 8 is introduced into the final settling tank 10 through the inlet 36.

The sludge introduced through the inlet 36 is gravity settled and fine contaminants which do not settle in the final settling tank 10 collide with the filter medium of the filter tank 12 installed on the top of the final settling tank 10 or the surface of the filter medium. It is oxidized and decomposed by the biofilm of and discharged to the discharge port 38.

The filtration tank 12 may have a desirable effect of forming the particles having a size occupying three quarters of the upper surface of the final settling tank 10 so as to collide with the filtration tank 12 and settle and remove them. Can be.

The filtration tank 12 prevents anaerobic sewage of the final sedimentation tank 10 and the filtration tank 12 by dissolving 1/4 of the upper surface of the final sedimentation tank 10 in the air and dissolving dissolved oxygen in the air. do.

The odor emitted from the first and second anaerobic tanks (2) and (4), the nitrogen gas and aeration tank (6), and the odor emitted from the contact oxidation tank (8) are discharged through the exhaust port (40), and the treatment state and A plurality of manholes 42 are provided for repair.

Experimental Example

Table 1 shows the results of the combined sewage treatment system for living sewage as described above, which were operated in a laboratory and operated for one year from May 1997 to April 1998.

Influent received sewage discharged from rural houses.

The experimental apparatus was reduced to 1/100 of the actual scale of five people.

Operation condition:

-Sludge bounce rate: 2Q (200%)

-BOD volume load: 0.2 kg / ㎥ 日

-BOD load per surface area of contact material: 25g / ㎡ 日

-Aeration tank DO concentration: 3 ~ 4 PPM

-Aeration tank and contact oxidation tank Retention time: 1day

Contact Material Specification:

-Material: Polypropylene

-Specific gravity: 0.91

Tensile Strength: 5∼8㎏ / ㎥

-BOD volume load: 0.2 ~ 0.4㎏ / ㎥

-Filling rate: 60 ~ 70%

Porosity: 90%

Water Quality Analysis Results

Table 1

Metric Influent (mg / ℓ) Effluent (mg / ℓ) Removal efficiency (%) BOD 212 2.8 98.6 SS 198 3.4 98.3 T-N 55 5.1 90.7 T-P 15 4.3 71.3

As described above, the average BOD removal efficiency of the sewage treatment system according to the present invention was found to be 98% or more, and the removal efficiencies of nutrients T-N and T-P were 90% and 71.3%, respectively.

It was also shown that the BOD contained in the effluent did not exceed 3 mg per liter.

As described above, the apparatus for treating sewage treatment according to the present invention can reduce environmental pollution since the pollutants in the sewage are treated by anaerobic microorganisms and aerobic microorganisms, and the untreated pollutants are finally discharged from the biofilm filtration tank. In addition, waste recycling and installation costs can be reduced by using waste vinyl recycled materials with high BOD removal rate per unit area, improving efficiency and reducing maintenance costs.

Claims (4)

A first anaerobic tank for firstly precipitating and anaerobic decomposition of the incoming organic matter and denitrifying sludge returned from the final settling chamber, a second anaerobic tank for secondly invading and anaerobicly degrading the organic material passed through the first anaerobic tank, and An aeration tank for oxidizing and decomposing the organic material passed through the second anaerobic tank by the floating microorganism, a contact oxidation tank for oxidizing and decomposing the organic material passed through the aeration tank by the microorganism attached to the contact material, and the sludge separated from the contact material. Life sewage treatment and purification apparatus comprising a final settling tank for precipitating and removing the filter, and a filtering tank for filtering the organic material passed through the final settling tank by the filter medium. The apparatus according to claim 1, wherein the volume ratio of the aeration tank and the contact oxidation tank is 6: 4. The living sewage combined purification treatment apparatus according to claim 1, wherein the contact material formed in the contact oxidation tank is made of recycled waste vinyl. The apparatus of claim 1, wherein the final sedimentation tank is provided with a filtration tank occupying 3/4 of the upper surface.