KR100302827B1 - Wastewater Treatment System and Method - Google Patents

Abstract

The present invention is because in the conventional wastewater treatment apparatus there is a problem that the green algae are generated by the growth of algae for the decomposition of many organic substances are often left in the discharge water,

Organic fermentation means that decomposes and separates untreated residual organic materials using anaerobic bacteria in secondary treatment process using activated sludge, and induces photosynthesis of green algae after decomposed / separated organic compounds are introduced. Recombination means for absorbing and by-product treatment means for removing gases and deposits generated during the treatment of residual organic matter

The present invention relates to a wastewater treatment apparatus and method capable of effectively improving water quality by decomposing organic substances contained in wastewater and synthesizing them into cellular materials, thereby reducing the amount of organic matter in wastewater and thus reducing the amount of BOD, nitrogen, and phosphorus.

Description

Wastewater Treatment Device and Method

The present invention relates to a method for treating wastewater, such as sewage, and more particularly, to a wastewater treatment apparatus and method capable of effectively improving water quality by decomposing from residual organic matter contained in wastewater and resynthesizing it with organic salts.

The general wastewater treatment device is to treat sludge contained in the wastewater by first treatment, and add activated sludge to the first treated water from which sludge is removed, and then discharge the sludge after chemical treatment by sludge.

However, the conventional wastewater treatment apparatus configured as described above has a problem in that water quality deteriorates due to eutrophication, in which organic substances are often left in the discharged water.

The present invention has been made to solve the above problems of the prior art, by using the anaerobic bacteria to decompose the residual organic matter contained in the discharged water discharged from the existing wastewater treatment apparatus and to absorb the organic salt by using photosynthetic action It is an object of the present invention to provide a wastewater treatment apparatus and method that can improve the water quality by making the discharged water cleaner.

1 is a block diagram schematically showing a wastewater treatment apparatus according to the present invention,

2 is a configuration diagram showing a main treatment tank which is a main component of the wastewater treatment apparatus according to the present invention;

3 is a process chart showing the wastewater treatment process by the wastewater treatment method of the present invention.

<Explanation of symbols for the main parts of the drawings>

11: anaerobic digestion tank 12 photosynthesis tank

13: degassing tank 14: sedimentation separation tank

15: rapid flocculation tank 16: sludge concentration tank

17: storage tank 18: filtration tank

Wastewater treatment apparatus of the present invention for achieving the above object in the wastewater treatment apparatus for treating the wastewater / wastewater to improve the water quality, using anaerobic bacteria as the residual organic material not treated in the secondary treatment process using the active sludge Organic fermentation means for decomposing and separating the organic solvent, resynthesizing means for absorbing residual organic salts through the photosynthesis of green algae after the decomposed / separated organic compound is introduced, and for removing gases and precipitates generated during the processing of residual organic matter. It is characterized by including a by-product treatment means.

In addition, the wastewater treatment method of the present invention comprises the first step of decomposing and separating the residual organic matter of the wastewater which has not been treated in the secondary treatment process using the activated sludge using anaerobic bacteria, and using the photosynthetic action of green algae. A second step of converting the organic salt formed from the product into living cell material, a third step of drawing the sludge precipitated by layer separation of the by-products generated in the first and second steps, and coagulation by injecting a flocculant into the waste water The fourth step of obtaining the treated water by precipitation separation after condensation and the fifth step of separating the organic material into a compound of a multimolecular or monomolecular form by supplying ozone to the organic material remaining in the first and second steps And a sixth step of filtering and discharging the treated water using a sand filter and activated carbon.

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

The wastewater treatment apparatus of the present invention uses the anaerobic digestion tank 11 in which residual organic matter contained in the secondary treated water is decomposed by anaerobic bacteria, and the anaerobic digestion tank using photosynthesis of algae. A photosynthesis tank 12 for absorbing the organic salt formed in (11), a degassing tank 13 for discharging the gas generated in the anaerobic digestion tank 11 and the photosynthesis tank 12 using a blower, and the anaerobic digestion tank (11) and the sedimentation tank 14 for discharging the precipitate generated in the photosynthesis tank 12 through the layer separation, and the sludge concentration tank 16 for concentrating the precipitate separated from the precipitation separation tank 14, and Storage tank 17 in which the sludge concentrated in the sludge concentration tank 16 is stored, and a rapid flocculation settling tank 15 for injecting a coagulant into the upper water of the sedimentation separation tank 14 to settle through coagulation and flocculation, and the rapid Open the water passing through the flocculation settling tank (15) It consists of a filtration tank 18 which discharges to.

Here, the anaerobic digestion tank 11, the photosynthesis tank 12 and the degassing tank 13 are configured as one system as shown in FIG.

The anaerobic digester (11) is an organic fermentation means, a distribution facility for equally distributing influent, and a contact filling facility for stably attaching and culturing anaerobic bacteria that decompose residual organic materials and convert them into water and organic salts; And a sludge treatment facility for discharging exfoliated sludge resulting from the treatment of residual organic matter of anaerobic bacteria, and a tank in which the above-described facility is installed.

The distribution facility for equally distributing the inflow water is not shown in the drawings, but the inflow water can be supplied in an evenly distributed state from the bottom surface of the anaerobic digester 11 through a well-known distribution plate having many holes. .

In addition, the photosynthesis tank 12 is a resynthesis means for absorbing organic salts through photosynthesis, consisting of a plurality of pipes or perforated plates having the same diameter and a distribution facility for equally distributing the influent, and the remaining organic matter changed by organic salts It consists of an attachment facility to which algae are reabsorbed into living cell materials through photosynthesis, and an illumination facility to project visible light to enable the algae to photosynthesize.

The attachment facility to which the algae is attached may be composed of a rope lamp made of natural fibers, and the lighting facility consists of a lamp for projecting visible light.

Wastewater treatment apparatus of the present invention configured as described above is to process the residual organic matter contained in the wastewater through the denitrification and dephosphorization treatment.

When the secondary treated water treated by the activated sludge enters the anaerobic digester (11), anaerobic bacteria (Nitrosomonas, Nitrorobactor) are allowed to collect residual organic matter contained in the secondary treated gas (NH4, CH4, H2S, CO2, ...). And water (H 2 O) and organic salts (N-compound, P-compound). The chemical reaction at this time is represented by the following formula (1).

[Formula 1]

The photosynthetic tank 12 absorbs the residual organic salts formed in the anaerobic digester 11 using a green algae plant group. Green algae plants absorb residual organic salts through photosynthesis and synthesize proteins into the cytoplasm to purify wastewater. At this time, the related reaction is represented by the following Chemical Formula 2.

[Formula 2]

That is, anaerobic bacteria decompose organic matter into organic salts through the chemical reaction of Chemical Formula 1, and green algae plants absorb organic salts through photosynthetic reaction of Chemical Formula 2 to synthesize proteins into living cell materials, thereby reducing the amount of organic matter contained in wastewater. Will be reduced.

The gas generated in the anaerobic digestion tank 11 and the photosynthesis tank 12 is decomposed in the degassing tank 13 to be dispersed into the atmosphere, and the treated water denitrated / dephosphorized in the anaerobic digestion tank 11 and the photosynthesis tank 12. Is moved to the sedimentation tank 14 to separate the layers. As the layers are separated, the upper clear water is moved to the rapid flocculation settling tank, and the precipitate precipitated at the lower side is concentrated in the sludge concentration tank 16 and temporarily stored in the storage tank 17 and then discarded. A coagulant is administered to the supernatant water transferred to the rapid flocculation settling tank 15 to coagulate and settle the organic matter, and the remaining water is passed through the filtration tank 18 to be filtered and finally discharged.

The wastewater treatment method according to the present invention comprises the first step of decomposing and separating residual organic matter of the wastewater which has not been treated in the secondary treatment process using the activated sludge using anaerobic bacteria, and photosynthesis of green algae as shown in FIG. 3. A second step of converting the organic salt formed from the residual organic matter into a living cell material by using the action, a third step of separating the by-products generated in the first step and the second step to draw out the sludge precipitated, and the waste water In the fourth step of obtaining the treated water by injecting a flocculant into the flocculation / flocculation and sedimentation after separation, the organic material is multi-molecule or monomolecular compound by supplying ozone to the organic material remaining in the first and second steps The fifth step of separating into a water, and the sixth step of filtration and discharge of the treated water using a sand filter and activated carbon.

Waste water treatment method of the present invention configured as described above is to improve the water quality by removing the organic matter contained in the waste water through the denitrification dephosphorization reaction.

When secondary treated water is introduced through the secondary treatment using activated sludge, anaerobic bacteria decompose residual organic matter contained in the waste water into organic salts. Organic salts produced by decomposition of residual organic matter are absorbed into the cellular material by photosynthetic reaction of green algae, and the waste water is purified. Green algae synthesize biomaterials through photosynthesis using visible light, and by absorbing organic salts and synthesizing them into proteins during photosynthesis, wastewater is purified. This process is called denitrification and dephosphorization because nitrogen and phosphorus in residual organic matter are synthesized as algae cellular material.

Thereafter, when the purified waste water is introduced into the sedimentation separation tank, layer separation is performed according to specific gravity, and the sludge precipitated at the bottom of the sedimentation separation tank is drawn. Subsequently, a flocculant is injected to coagulate and condense to obtain treated water. Subsequently, ozone is supplied to the waste water, and the remaining organic substance is separated and converted into a multimolecular or monomolecular compound (H 2 O, CO 2, ...), and the waste water is filtered through a sand filter and activated carbon and discharged. .

At this time, since the amount of organic matter contained in the effluent becomes fine, BOD (Bio-chemical Oxigen Demand) is reduced and the amount of nitrogen (N) and phosphorus (P) is reduced, thereby increasing the effect of improving the water quality.

As described above, the wastewater treatment apparatus and method of the present invention decomposes organic substances contained in wastewater and synthesizes them into cellular materials. Therefore, the organic matter content of the wastewater is reduced to reduce the amount of BOD, nitrogen, and phosphorus. have.

Claims (2)

In the wastewater treatment apparatus for treating the wastewater / wastewater to improve the water quality, Anaerobic digester which decomposes and separates untreated residual organic material by anaerobic bacteria in secondary treatment process using activated sludge, and induces photosynthesis of green algae after decomposed / separated organic compound is introduced. A wastewater treatment apparatus comprising a photosynthetic tank for absorbing and by-product treating means for removing gas and sediment generated in the process of residual organic matter. The first step of decomposing and separating residual organic materials of untreated wastewater using anaerobic bacteria in the secondary treatment process using activated sludge, and organic salts formed from residual organic materials using photosynthetic action of green algae as living cell materials. A second step of changing, a third step of drawing the sludge precipitated by layer separation of the by-products generated in the first step and the second step, and a flocculant is injected into the waste water to precipitate and separate the precipitate after the coagulation / coagulation. A fourth step of obtaining, and a fifth step of separating ozone into a compound of a multimolecular or monomolecular form by supplying ozone to the organic material remaining in the first and second steps, and using a sand filter and activated carbon. Wastewater treatment method comprising a sixth step of filtering and discharging the treated water.