KR100983829B1 - Wastewater Treatment by Corrosion of Organics Using Methane Fermentation Tank - Google Patents

Abstract

The present invention denatures the wastewater containing organic substances into the input tank, the methane fermentation tank, the collection tank, the metering tank, the aeration tank, the settling tank, the distribution tank, the culture tank and the reservoir tank while denatured to corrosive materials and repeats this to the inflow point of the wastewater. It is related with the method of treating wastewater by the method of conveying.

Description

Wastewater Treatment Methods by Decay of Organic Materials Using Methane Bio-Reactor

The present invention relates to a method for treating wastewater by corrosive organics using a methane fermentation tank, and more specifically, to an input tank, a methane fermentation tank, a collection tank, a metering tank, an aeration tank, a precipitation tank, a distribution tank, a culture tank and a sludge storage tank. A method of treating wastewater by corrosive organics via light oil.

Methane fermentation is a phenomenon in which organic matter is decomposed into methane, an anaerobic bacterium, to produce methane and carbon dioxide. Methane is usually killed or inactivated in the presence of oxygen. Therefore, the methane fermentation tank must remain anaerobic in order to block free oxygen in the air. By the way, the carbon dioxide produced by the methane fermentation is reduced to produce excess oxygen in the process of producing methane gas (CO ₂ + 2H ₂ O = CH ₄ + 2O ₂ ). When such oxygen takes the form of free oxygen, a group of organized anaerobic bacteria, including methane, is killed or inactivated, and methane fermentation is stopped. Therefore, in order for methane fermentation to continue, the above-mentioned excess oxygen must be consumed without the form of free oxygen.

On the other hand, in the conventional wastewater treatment method, the extinguishing liquid (fermentation liquid) produced in the methane fermentation tank has a bad smell, and therefore it cannot be used even if it is used as a liquid ratio.

In addition, even if the digestive liquid produced in the methane fermentation tank is to be treated in a sewage treatment plant, carbon in organic matter with high C / N ratio such as livestock manure and food waste is reduced to methane gas, but nitrogen is not removed and remains as it is. The extremely low C / N ratio also makes it difficult to maintain total nitrogen regulation in sewage treatment plants.

In addition, due to the absorption of heat in the chemical reaction of the reduction univariate to methane gas, the liquid temperature of the methane fermentation tank, an anaerobic fermentation tank is continuously lowered, so the methane fermentation tank must be continuously heated. As a result, a considerable amount of energy is required to heat the fermenter instead of obtaining bioenergy called methane gas.

Except for special cases, methane fermentation tanks in the conventional wastewater treatment methods are composed of artificial environments such as concrete structures, and thus no corrosive substances or silicates are present. In addition, since microorganisms that feed organic matter contained in wastewater naturally occur in concrete structures, and these naturally occurring microbial groups allow the wastewater to be purified, it becomes an environment where no corrosives exist, thereby degrading organic matter generated in nature. The reaction is different from the reaction. As a result, in the methane fermentation tank, no soiling reaction (corrosion reaction) occurs, and thus, chelating compounds, growth promoters, antibiotics, and bioactive substances, which are microbial metabolites generated during the corrosion process, are not produced.

As a result, since the antibacterial function against the external product, growth promoting function, and deodorization function by the chelate compound are weak, the odor generated in the digestive liquid produced in the methane fermentation tank is bad, and also the since the rate at which breathing oxygen within the template density low molecular low as well as degrade methane gas generation efficiency, and particularly, nitro consumption eggplant (NITROSOMONAS), nitro bakteo (NITROBACTER) lower nitrification reaction as the template density of the nitrifying bacteria, such as extreme Since this does not occur at all, the nitrogen removal efficiency is low, and the nitrogen content in the extinguishing liquid is not lowered.

The present invention was developed to effectively solve the problems in the conventional wastewater treatment method,

An object of the present invention is to improve the methane gas generation efficiency, reduce the energy consumption for heating the methane fermentation tank anaerobic digestion tank, significantly improve the C / N ratio, wastewater by the corrosion of organic materials that can reduce the odor of anaerobic digestion liquid To provide a treatment method of.

The object of the present invention is to denature the waste water containing organic material via input tank, methane fermentation tank, fermentation filtrate collection tank, metering tank, aeration tank, sedimentation tank, distribution tank, culture tank and reservoir tank, and this is repeated again The wastewater is returned to the inflow point of the wastewater, and the final treated water is achieved by a method of treating wastewater discharged from the treatment tank or used as a liquid ratio.

The present invention is a wastewater treatment method for treating raw water (wastewater) containing organic substances via input tank, methane fermentation tank, fermentation filtrate collection tank, metering tank, aeration tank, sedimentation tank, distribution tank, culture tank, sludge storage tank, and treatment tank. ,

A stirrer is installed in the input tank to agitate the corrosive reaction and the activated silicate having completed the corrosive reaction returned from the raw water and the culture tank to activate the corrosive reaction;

Introducing the raw water which has undergone the corrosion reaction from the charging tank into a methane fermentation tank to proceed with fermentation by methane;

The fermentation digestion solution (fermentation filtrate) from the methane fermentation tank is introduced into the fermentation filtrate collection tank, while the fermentation filtrate collection tank is introduced into the metering tank, a certain amount of digestion liquid is introduced into the aeration tank, and the remaining amount is returned to the fermentation filtrate collection tank. Maintaining a constant flow of digestive fluid into the aeration tank;

In the aeration tank, the digestion liquid flowing from the metering tank is mixed with sludge flowing from the distribution tank to decompose the organic matter in the digestion liquid in an aerobic state;

The treated product from the aeration tank is introduced into the settling tank, and after solid-liquid separation in the settling tank, the settling sludge is transferred to the distribution tank, and the supernatant is transferred to the treated water tank and discharged or used as a liquid ratio;

A part of the settling sludge introduced into the distribution tank is returned to the fermentation filtrate collection tank and the aeration tank, and the rest of the settling sludge is transferred to the sludge storage tank and the culture tank;

The precipitated sludge introduced into the culture tank is incubated in the presence of the active material silicate and the corroded pellets of the humus filled in the culture tank;

The sedimentation sludge introduced into the reservoir tank is dehydrated, sludge is discharged, and a certain amount of the dehydration filtrate is returned to the fermentation filtrate collection tank, and the remaining amount of the dehydration filtrate is used as a liquid ratio. Provide a method for treating wastewater.

Compared with the conventional wastewater treatment method, the wastewater treatment method of the present invention has 1) less odor of anaerobic digestion liquid from methane fermentation tank, 2) higher generation rate of methane gas, and 3) energy consumption due to heating of the methane fermentation tank. 4) C / N ratio can be significantly improved because it promotes denitrification by increasing the density and proliferation rate of nitrifying bacteria.

Hereinafter, the wastewater treatment method of the present invention will be described in detail with reference to the treatment flow diagram of FIG. 1.

In the wastewater treatment method of the present invention, when raw water (wastewater) is newly introduced into the input tank, the raw water is stirred by a stirrer installed in the input tank. In addition, the wastewater inflow point of the input tank is introduced with a culture medium rich in corrosive substances and active silicates, the corrosion reaction from the culture tank is completed. Therefore, unlike the conventional wastewater treatment method in which only raw water is introduced into the input tank, in the wastewater treatment method of the present invention, due to the presence of corrosive substances and active silicates in the input tank, the anaerobic and anaerobic microorganisms inhabiting the raw water Metabolites are produced by the action of. When these microorganisms, their metabolites and organics enter the methane fermentation tank, organic fermentation begins first and CO ₂ is generated. These CO ₂ are converted back to methane by methane bacteria. Before the oxygen generated becomes free oxygen and the methane bacteria die, the anaerobic and aerobic microorganisms in which the oxygen in the molecule symbiizes with the organized anaerobic microorganisms The carbon source in the organic material generates CO ₂ as energy again, and these CO ₂ are converted back to methane by methane bacteria.

In addition, since the energy is generated during the CO ₂ generation process, and offsets the energy absorption by the reduction reaction of anaerobic microorganisms, heating energy required to increase the temperature of the methane fermentation tank can be reduced, and organic acid fermentation Since the CO ₂ generated by the CO ₂ generation and oxidation of aerobic microorganisms get up at the same time the higher the methane generation efficiency.

In addition, the culture tank is formatted density of nitrifying bacteria nitro consumption eggplant (NITROSOMONAS) in the culture medium to be conveyed twos input, nitro bakteo (NITROBACTER) is high in, the nitrogen within the ammonia with oxygen in the molecule can be oxidized with nitric acid, In an oxygen-free state, the carbon source in the wastewater is denitrified as energy, thereby removing nitrogen.

The digestion liquid fermented in the methane fermentation tank is introduced into the fermentation filtrate collection tank, the level of the fermentation filtrate collection tank is always changed because the amount of digestion liquid flowing into the fermentation filtrate collection tank is constant, but the inflow from the fermentation filtrate collection tank to the aeration tank is aeration tank. It is always kept constant by the metering tank installed at the front end.

That is, in the wastewater treatment method of the present invention, in order to stably treat the wastewater, a certain amount is introduced into the aeration tank while pumping digestion liquid from the fermentation filtrate collection tank into the metering tank, and the remaining amount is returned to the fermentation filtrate collection tank. By taking the sending process. The inflow of digestive fluid into the aeration tank is made constant at all times for 24 hours.

At the front end of the aeration tank, the digestion liquid from the metering tank and the settling sludge from the distribution tank flow in to decompose the organic matter in the digestion liquid in an aerobic state.

When the operation of the aeration tank is increased by increasing the MLSS, the sludge age is long, so that the nitrifying bacteria can be occupied to increase the proliferation density of the nitrifying bacteria which are slow to grow, as well as the nitrifying bacteria inhabiting the return sludge are supplied to the aeration tank. The densities of are higher than naturally occurring growth in the aeration tank. In addition, since the activity of microorganisms increases under the influence of growth promoting substances and bioactive substances contained in sludge returned and introduced, the growth rate of nitrifying bacteria is also increased, and oxidation of ammonia nitrogen to nitrate nitrogen by the nitrifying bacteria is prevented. Is promoted.

In addition, the chelating organic material contained in the sludge returned and introduced is removed from the liquid phase by forming a complex compound or an internal compound by the chelating effect with the ionic inorganic material contained in the raw water. At the same time, the odor constituent molecules are dissolved in water, hydrated, and exist as ions. Thus, the odor disappears by collecting ions such as NH ₄ ⁺ , which are the constituent molecules of the odor, as constituent molecules of the complex or internal compound.

In addition, breathing the intramolecular oxygen of NO _X contained in the sedimentation sludge returned from the distribution tank to the aeration tank inlet point using BOD and COD present in the raw water first introduced into the input tank by the aerobic and anaerobic microorganisms. As a result, denitrification progresses, and at the same time, BOD and COD are lowered.

Since the aeration tank conveys a part of the sedimentation sludge from the distribution tank by using a conveying device (pump), the center of the aeration tank is always kept in a stirring state, and the denitrification is performed by actively mixing and agitating the extinguishing liquid flowing from the metering tank into the aeration tank. Promote.

The treated product from the aeration tank flows into the settling tank, where the solid-liquid separation is performed using, for example, an ultrafiltration membrane. Since the settling tank is operated in a high MLSS state, the aeration tank, which is the previous stage, is preferably a capacity that does not carry over the sludge.

The settling tank not only functions as a solid-liquid separation tank but also continuously transfers the settling sludge to the distribution tank, and thus maintains a stirring state at all times, and also has a low DO, thereby serving as a denitrification tank. In addition, the settling tank also functions as a reaction tank to lower the BOD and COD while T-N is removed. The transfer of the settling sludge from the settling tank to the dispensing tank is preferably carried out by installing an air lift which avoids a pump with strong physical force and a weak physical force as much as possible. From the distribution tank, a certain amount of precipitated sludge is distributed to the fermentation filtrate collection tank, the culture tank, and the sludge storage tank, and the distribution amount is adjusted to V-knoch so that it is always introduced constantly, and the remaining amount of the precipitated sludge is drained to the aeration tank. Drain).

The sedimentation sludge introduced into the culture tank from the distribution tank is cultured in the culture tank filled with the corrosive substance and active silicate powder pelletized humus soil, and the cultured corrosive pellet (corrosive material) and activated silicate are filled with the corrosive pellet. It is preferable to be filled in a weight ratio of silicate = 1: 2, and it is preferable to design it to replenish the caustic to pellet and 50% of the active silicate every year.

As described above, in the course of the input tank, methane fermentation tank, fermentation filtrate collection tank, metering tank, aeration tank, sedimentation tank, distribution tank and culture tank, the organic material in the waste water is vaporized with CO ₂ , N _2, etc. The corrosives are converted into corrosives, and the corrosives are returned to the input tank which is the inflow point of the wastewater, mixed with the wastewater, and stirred, whereby the corroding of the organic matter in the wastewater is more effectively achieved.

The sludge flowing into the sludge storage tank is dewatered, and the sludge is discharged to the outside, and the dehydration liquid is returned to the fermentation filtrate collection tank or used as a liquid ratio.

The supernatant flowing into the treatment tank from the settling tank is discharged or used as a liquid ratio.

1 is a system diagram of a wastewater treatment method of the present invention.

Claims (2)

A wastewater treatment method for treating wastewater containing organic substances via an input tank, a methane fermentation tank, a fermentation filtrate collection tank, a measuring tank, an aeration tank, a precipitation tank, a distribution tank, a culture tank, a sludge storage tank, and a treatment tank, A stirrer is installed in the input tank to agitate the corrosive reaction and the activated silicate having completed the corrosive reaction returned from the raw water and the culture tank to activate the corrosive reaction; Introducing the raw water which has undergone the corrosion reaction from the charging tank into a methane fermentation tank to proceed with fermentation by methane; From the methane fermentation tank, the fermentation complete digestion liquid is introduced into the fermentation filtrate collection tank, and in a state in which the fermentation filtrate collection tank is introduced into the metering tank, a predetermined amount of digestion liquid is introduced into the aeration tank, and the remaining amount is returned to the fermentation filtrate collection tank to the aeration tank. Keep the inflow of digestive fluid constant; In the aeration tank, the digestion liquid flowing from the metering tank is mixed with sludge flowing from the distribution tank to decompose the organic matter in the digestion liquid in an aerobic state; The treated product from the aeration tank is introduced into the settling tank, and after solid-liquid separation in the settling tank, the settling sludge is transferred to the distribution tank, and the supernatant is transferred to the treated water tank for discharge or used as a liquid ratio; A part of the settling sludge introduced into the distribution tank is returned to the fermentation filtrate collection tank and the aeration tank, and the rest of the settling sludge is transferred to the sludge storage tank and the culture tank; The precipitated sludge introduced into the culture tank is incubated in the presence of the active material silicate and the corroded pellets of the humus filled in the culture tank; The sedimentation sludge introduced into the reservoir tank is dehydrated, sludge is discharged, and a certain amount of the dehydration filtrate is returned to the fermentation filtrate collection tank, and the remaining amount of the dehydration filtrate is used as a liquid ratio. Waste water treatment method. The wastewater treatment method according to claim 1, wherein the culture tank is filled with a corrosive substance consisting of pelletized humus and active silicate in a weight ratio of corrosive substance: active silicate = 1: 2.

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