KR100544367B1 - Sewage and weste water treatment system - Google Patents

Abstract

Disclosed is a water treatment apparatus capable of simultaneously treating contaminants contained in sewage or waste water, that is, organic matter, suspended matter, nitrogen, phosphorus, and the like. This water treatment device is a bioreactor (10) for the inflow of raw water, such as sewage or wastewater, and accommodates aerobic microorganisms and nitrification microorganisms to oxidatively decompose organic matter and convert nitrogen components in the form of ammonia nitrogen into nitrate states; Water, nitrate ions and residual organic matter submerged in the primary water and inhaled into the suction pump 60 are suspended in the bioreactor 10 and the suspended solids and solids and water, nitrate ions and residual organic matter. Water, nitrate ions, and remaining organic substances are introduced through the immersion type separation membrane 50 and the immersion type separation membrane 50, and oxidative decomposition of the remaining organic substances by electrical oxidizing power and reduction of nitrate nitrogen ions to nitrogen gas are performed. An electrolysis tank 20 for removing nitrogen ions is provided. In addition, the phosphorus (P) contained in the water is added to the flocculant in the water so that the flocculant to agglomerated phosphorus to pass through the immersion type separation membrane (50). Such a water treatment device is simple in structure and easy to manage by employing a bioreactor and an electrolysis tank. In addition, water treatment efficiency is high by simultaneously treating contaminants, ie, organic matter, suspended matter, nitrogen, and phosphorus, from raw water.

 Water treatment, bioreactor, electrolysis, organics, nitrogen, phosphorus

Description

Sewage and weste water treatment system

1 is a block diagram showing a conventional water treatment apparatus,

2 is a schematic view showing the water treatment apparatus of the present invention.

* Explanation of symbols for main parts of the drawings

10 Bioreactor 15 Transfer pump

20.Electrolysis Tank 30 ... Concentration Tank

31.Bulk 32.Sedimentation Sludge

40 treatment tank 50 immersion membrane

60 ... suction pump 70 ... blower

80.Water level sensor 90 ... Coagulant input

The present invention relates to a water treatment apparatus, and more particularly, to a water treatment apparatus capable of simultaneously treating contaminants contained in sewage or waste water, that is, organic matter, suspended matter, nitrogen, phosphorus, and the like.

Generally, when nitrogen or phosphorus is contained in large amounts in the cell composition or sewage or wastewater necessary for the survival of organisms in the ecosystem, the organisms such as algae or bacteria are excessively propagated and cause an imbalance of the ecosystem. Therefore, pollutants in water treatment of sewage or wastewater Seen as.

A water treatment apparatus that can simultaneously process nitrogen and phosphorus which flows into sewage, wastewater and sewage and causes eutrophication when discharged into a river is disclosed in Korean Utility Model Registration Application No. 2003-39564, and a flowchart thereof is schematically shown in FIG. Is shown.

The device is equipped with an anoxic tank equipped with a stirrer for denitrifying the pretreated raw water and a stirrer for inducing phosphorus release and storing organic matter in the form of PHB (poly-β-hydroxybutyrate) in an anaerobic state. An anaerobic tank, a contact oxidation tank equipped with a fixed bed contact medium and an aeration device for oxidizing the organic matter of raw water and phosphorus ammonia nitrogen (NH4 + -N) induced by phosphorus in the anaerobic tank by a microorganism, and from the contact oxidation tank. Membrane separation tank equipped with an immersion type membrane and aeration device for solid-liquid separation of the raw water into sludge-containing solid material and treated water, and inducing precipitation while removing dissolved oxygen dissolved in the sludge-containing solid material separated from the membrane separation tank. When the sludge-containing solid material from which dissolved oxygen is removed from the sedimentation degassing tank and the sedimentation degassing tank is returned to the anoxic tank The sedimentation degassing tank has a shape that becomes narrower as the inside goes downward, and the treated water outlet is provided at a point higher than the effective depth so that the excess amount of the treated water separated by the liquid-liquid separated by sediment can flow out. It is structured.

While these devices have the advantage of removing nitrogen, phosphorus, and organic matter contained in sewage, wastewater, and sewage, the complex state of the art requires high-level technology to manage and maintain complex processes. As a result, small- and medium-sized treatment plants are not effective.

The present invention has been made to solve the above problems, and an object thereof is to provide a water treatment apparatus capable of simultaneously treating organic material oxidation, denitrification, dephosphorization, and sterilization as a simple structure.

Another object of the present invention is to provide an improved water treatment apparatus for easy management and high treatment efficiency.

Water treatment device of the present invention to achieve the above object is a raw water, such as sewage or waste water is introduced, the aerobic microorganisms and nitrification microorganisms are accommodated and the bioreactor to oxidatively decompose organic matter and convert nitrogen components in the form of ammonia nitrogen to nitrate nitrogen state; ,

The water, nitrate ions and remaining organics are immersed in the bioreactor and sucked water, nitrate ions and remaining organics from the primary decomposed water with a suction pump to separate the suspended substances and solids and the water, nitrates and residual organics in the bioreactor 10 Immersion type separation membrane,

An electrolysis tank for introducing water, nitrate ions, and remaining organic substances through the immersion membrane and oxidatively decomposing the remaining organic substances by electrical oxidizing power and reducing nitrate nitrogen ions to nitrogen gas to remove nitrate nitrogen ions;
The suspended solids concentrated in the bioreactor are discharged through the bottom of the partition wall at one end of the bioreactor, and the suspended solids are provided at the bottom, and the suspended solids deposited at the bottom of the concentrated tank are discharged to the outside. The supernatant in the concentration tank passing through the bottom of the partition wall is characterized in that the transfer pump to the bioreactor.

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The water treatment apparatus of the present invention is provided with an acid pipe on the bottom of the bioreactor, and further provided with a blower for supplying air into the bioreactor through the acid pipe, to aggregate the phosphorus (P) dissolved in the water in the bioreactor Characterized in that it further comprises a flocculant inlet for.

According to the characteristics of the present invention, the water treatment apparatus of the present invention can simplify the structure by employing a bioreactor, a flocculant input unit and an electrolysis tank, and can simultaneously process organic matter, nitrogen, phosphorus, etc., thereby improving water treatment efficiency.

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

Referring to Figure 2 showing the water treatment apparatus of the embodiment of the present invention, it is introduced into the raw water, such as sewage or waste water, and aerobic microorganisms and nitrification microorganisms are accommodated to oxidatively decompose organic matter and nitrogen components in the form of ammonia nitrogen to nitrate nitrogen The bioreactor 10 to be converted and the organic matter immersed in the bioreactor 10 and sucked water, nitrate ions and remaining organic matter from the primary decomposed raw water to the suction pump 60 to suspended matter in the bioreactor 10 And an immersion type separation membrane 50 in which solid materials and water, nitrate ions and residual organic substances are separated, and water, nitrate ions and residual organic substances introduced through the immersion type separation membrane 50 and oxidatively decomposes the remaining organic substances by electric oxidizing power. And it is provided with an electrolysis tank 20 for removing the nitrate nitrogen ions by reducing the nitrate nitrogen ions with nitrogen gas.

In addition, there is provided a concentration tank 30 through which the suspended solids concentrated in the bioreactor 10 are discharged through the bottom of the partition 11 at one end of the bioreactor 10 so that the suspended solids are precipitated at the bottom. (30) The suspended solids 32 deposited at the bottom are discharged to the outside, and the supernatant in the concentration tank 30 passing through the bottom of the partition 11 is transferred to the bioreactor 10 by a transfer pump 15. Let's do it. That is, in order to remove sludge which is suspended solids 32 concentrated in the bioreactor 10, the suspended solids 32 are connected to the bioreactor 10 so that water can pass therethrough and the partition 11 is installed. The supernatant passing through the bottom of the partition 11 is transferred to the bioreactor 10 by the pump 15 so as to settle on the bottom of the concentration tank 30, and the suspended solids 32, that is, sludge, are stored in the bottom of the concentration tank 30. If a certain amount is stored, dispose to the outside.

In addition, the water treatment device of the present invention is provided with an air diffuser (71) on the bottom surface of the bioreactor 10, the blower 70 for supplying air into the bioreactor 10 through the acid pipe 71 is further provided. can do.

In addition, the water treatment apparatus of the present invention further includes a coagulant input unit 90 for agglomerating phosphorus (P) dissolved in the water in the bioreactor 10 so that the water containing the coagulant of the coagulant input unit 90 is a bioreactor. Phosphorus (P) in the bioreactor 10 and the coagulant react with each other to agglomerate the phosphorus (P) in the bioreactor 10 into particles of a predetermined size or more, and the aggregated phosphorus (P) is an immersion type separation membrane (50). ) Does not pass through and remains in the bioreactor 10 and eventually flows into the concentration tank 30 for disposal.

If the amount of phosphorus (P) and nitrogen (N) in the components contained in the water is higher than necessary, the algae or microorganisms are activated to increase the algae or microorganisms, and eventually the respiratory volume of the algae or microorganisms is increased. Since the oxygen contained in the water is depleted, the water treatment apparatus of the present invention should remove the phosphorus (P) and nitrogen (N) in the bioreactor 10, the phosphorus (P) in the bioreactor 10 is It is removed using the flocculant inlet 90.

Reference numeral 31 denotes a partition wall to prevent mixing of the turbid liquid flowing from the bioreactor 10 and the clear supernatant flowing into the bioreactor 10 from the concentration tank 30.

Further, an acid pipe 71 is provided on the bottom of the bioreactor 10, and a blower 70 is provided to supply air into the bioreactor 10 through the acid pipe 71.

By supplying air to the bioreactor 10 through the acid pipe 71 to ensure the dissolved oxygen required for decomposition of the organic matter and nitrogen components in the bioreactor 10.

In addition, the bioreactor 10 is provided with a water level sensor 80 for detecting the level of the incoming raw water, the water level sensor 80 is installed at a position higher than the immersion membrane (50).

Therefore, the amount of raw water flowing into the bioreactor 10 is reduced, and when the water level is lower than the immersion type separation membrane 50, the water level sensor 80 detects this to stop the operation of the suction pump 60 to block the inflow of water. do. Accordingly, the immersion type separation membrane 50 may be prevented from being damaged by driving the suction pump 60 while the immersion type separation membrane 50 is exposed on the surface of the raw water.

The sewage treatment apparatus having the above configuration is operated as follows.

When raw water, such as sewage or wastewater, enters the bioreactor 10, organic matter is decomposed by aerobic organic matter decomposing microorganisms, and most of the nitrogen components in the form of ammonia nitrogen (NH ₃ -N) are nitrateized by nitrifying bacteria. It is converted to nitrogen (NO ₃ -N) state.

At this time, dissolved oxygen, which is an important factor of these reactions, is secured by being provided to the diffuser 71 of the bioreactor 10 as compressed air through the blower 70.

Such organic decomposition and nitrification reactions have the following reaction formulas.

(1) organic decomposition reaction

1) Oxidation of Organic Matter by Energy Generation

CH ₂ O + O ₂ --------- → C ₂ O + H ₂ O

2) Organic Matter Oxidation by Endogenous Respiration

C ₅ H ₇ NO ₂ + 5O ₂ --------- → 5CO ₂ + NH ₃ + H ₂ O

(2) nitrification

NH ₄ + + 3 / 2O ₂ Nitrosomonas NO _2- + 2H ⁺ + H ₂ O

NO _2- + 1 / 2O ₂ Nitrosomonas NO _3-

NH ₄ + + 2O ₂ --------- → NO _3- + 2H ⁺ + H ₂ O

As described above, after the organic material oxidation reaction and the nitrification reaction are completed, suspended matter, remaining organic material, nitrogen nitrate and phosphorus remain in the water.

Phosphorus (P) remaining in the bioreactor 10 is added to the bioreactor 10 by the coagulant input unit 90, phosphorus (P) in the bioreactor 10 and the coagulant reacts to phosphorus (P) When agglomerates into particles of a certain size and remains in the bioreactor 10 and then drives the suction pump 60, the remaining substances (nitrogen nitrogen, etc.) together with the water except phosphorus (P) that are suspended and aggregated together with water It is introduced into the electrolysis tank 20 via the immersion type separation membrane 60.

In the electrolysis tank 20, residual organic matter, pathogenic bacteria, etc., which are trace amounts of harmful substances, are removed by secondary oxidative decomposition, and nitrate nitrogen (NO ₃ -N) is harmless nitrogen gas (N ₂ ) by reducing power. To create and remove.

That is, the electrolyzer 20 includes a proton (H ⁺⁾ and hydroxide ions (OH ^-) are generated by electrolysis of water which is to make a radical using a strong oxidizing power and reducing power thereof constant for water.

The operating principle of the electrolysis tank 20 is as follows.

(1) at the anode

^{H-OH --------- → [H +} ] + [OH -] ( ionization)

^{[OH -] + e --------- →} [OH] ( positive)

2 [OH] --------- → H ₂ O + [O] (oxygen generator)

2 [O] (H) --------- → O ₂

(2) at the cathode

HOH --------- → [H ⁺ ] + [OH-] (ionization)

[H ⁺ ] + e --------- → [H] (Negative Hydrogen Generator)

2 [H] --------- → H ₂ (hydrogen gas)

(3) organic matter oxidation reaction

C + 2OH- + [O] --------- → CO ₂ + H ₂ O

(4) denitrification

2NO _3- + 12H ⁺ + 10e --------- → N ₂ + 6H ₂ O

On the other hand, phosphorus (P) introduced into the electrolysis tank 20 is adsorbed and removed in the activated carbon adsorption unit (not shown).

The water treated as described above is stored in the treatment water tank 40 and reused or discharged.

On the other hand, when suspended solids are continuously generated and concentrated in the bioreactor 10, sludge is produced. The sludge and phosphorus (P) aggregated in the bioreactor 10 are one side partition 11 of the bioreactor 10. Transported and stored in the concentration tank 30 through the bottom and the precipitated sludge 32 and the aggregated phosphorus (P) is discharged to the outside.

In addition, the supernatant of the concentration tank 30 passing through the bottom of the partition 11 is transferred to the bioreactor 10 by the pump 15 and is reprocessed.

The water treatment apparatus of the present invention as described above has a simple structure and convenient management by employing a bioreactor and an electrolysis tank.

In addition, water treatment efficiency is high by simultaneously treating contaminants, ie, organic matter, suspended matter, nitrogen, and phosphorus, from raw water.

In general, the simultaneous treatment of organic matter, nitrogen, phosphorus, etc. by biological treatment methods (activated sludge method, A2O, SBR, etc.) should be uniformly present in organic matter: nitrogen: phosphorus, but the present invention exists in an unbalanced ratio. Decomposition by force has the advantage of not much dependence on the dependence of microorganisms.

Claims (4)

delete Raw water, such as sewage or wastewater, is introduced and the aerobic microorganisms and nitrification microorganisms are accommodated, the biological reaction tank (10) for oxidatively decomposing organic matter and converting nitrogen components in the form of ammonia nitrogen to nitrate nitrogen state, Water, nitrate ions and remaining organics are immersed in the bioreactor 10 and sucked water, nitrate ions and remaining organic matter from the primary decomposed raw water into the suction pump (60), the suspended solids and solids and water, nitrate ions in the bioreactor 10 And an immersion type separation membrane 50 in which residual organic materials are separated. Water, nitrate ions, and remaining organic substances are introduced through the immersion type separation membrane 50 and oxidatively decomposes the remaining organic substances by electric oxidizing power, and the nitrate nitrogen ions are reduced to nitrogen gas to remove nitrate nitrogen ions. Decomposition tank 20, The enrichment tank 30 is provided with suspended solids concentrated in the bioreactor 10 through the bottom of one side partition 11 of the bioreactor 10 and the suspended solids are deposited on the bottom. The suspended solids deposited on the bottom of the concentration tank 30 are discharged to the outside, and the supernatant in the concentration tank 30 passing through the bottom of the partition 11 is transferred to the bioreactor 10 by a transfer pump 15. Water treatment apparatus, characterized in that. delete delete

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