KR20010056058A - Management Unit and Method of Foul and Waste Water - Google Patents

Abstract

PURPOSE: An advanced biological treatment equipment for wastewater containing high concentration nitrogen is provided, which can be applied easily to nonbiodegradable organic matter and plant wastewater containing high concentration nitrogen that is difficult to treat as well as general sewage and wastewater. CONSTITUTION: The system comprises the followings: (i) an anoxic tank to which nitrified matter is internally recycled from an aerobic tank exit and sludge is recycled from a settling tank for denitrifying by denitrification microorganism and for feeding a proper amount of foreign source of organic matter to maximize denitrification rate; (ii) an anaerobic tank for maximizing dephosphorizing rate by dephosphorization microorganism; and (iii) an aerobic tank for absorbing excess phosphorus that is discharged from the anaerobic tank and for removing phosphorus, and for keeping high concentration microorganism by controlling recycling of nitrification microorganism.

Description

Wastewater treatment apparatus and method by biological reaction of high concentration nitrogen containing wastewater {Management Unit and Method of Foul and Waste Water}

The present invention relates to an apparatus and method for treating sewage by biological reaction of high concentration nitrogen containing wastewater, in particular, in the case of general sewage and wastewater, as well as difficult to decompose organic matter and high concentration nitrogen containing plant wastewater, which are difficult to treat. In addition, the present invention relates to a wastewater treatment apparatus and method by biological reaction of high concentration nitrogen-containing wastewater, which is characterized in that it can satisfy stable treated water quality.

Most of the conventional wastewater treatment systems are designed and operated by activated sludge method, and the activated sludge method is a treatment process that mainly aims at removing organic matter, and thus it is time to remove nitrogen and phosphorus as the eutrophication of the current appeal becomes serious. In light of this, it cannot be met. In addition, the activated sludge method was unstable in processing such as weak influx load and sludge swelling phenomenon.

In addition to solving the problems of swelling caused by the difficulties in operating the activated sludge method, various treatment processes for effectively removing nitrogen and phosphorus, which are the main culprit of eutrophication, have been studied and put into practice.

Examples include A ₂ / O, UCT, MUCT, VIP, and the Bardenpho method.

The A ₂ / O method consists of three anaerobic tanks, three anaerobic tanks and four aeration tanks, which release phosphorus in the anaerobic tank, denitrification in the anaerobic tank, and nitrification and phosphorus intake in the aeration tank.

However, due to nitrate nitrogen in the return sludge, the phosphorus removal rate is lowered in the anaerobic tank, and the phosphorus removal rate is lowered.

In particular, when low concentrations of organic matter are introduced, as in the case of domestic sewage, it is very difficult to guarantee stable treated water quality when performing on-site application without technical supplementation.

The UCT process developed to solve these shortcomings is to return the return sludge to the anaerobic tank next to the anaerobic tank, remove nitrate nitrogen, and send it to the anaerobic tank to inhibit the phosphorus release.

The MUCT and VIP process separates the anaerobic tank into an anaerobic tank that removes nitrate nitrogen in the conveying sludge and returns it to the anaerobic tank and an anoxic tank which denitrates the returned nitrogen nitrate nitrogen. There are disadvantages such as additional installation and maintenance complexity.

In addition, the Bardenpho process has the highest efficiency of about 90% among the existing nitrogen and phosphorus removal processes, but has a disadvantage in that a long residence time of 10 to 24 hours is required. In particular, when the sewage concentration is low, the residence time is long, and there is a problem in that the overall treatment efficiency such as nitrogen phosphorus decreases due to the lack of organic material for denitrification.

Looking at all of the advanced treatment processes developed to date, all processes have a common microbial community that removes contaminants, nitrogen and phosphorus, that is, return sludge, so that they all circulate anaerobic, anaerobic and aeration conditions. The activity of nitrifying microorganisms, which are aerobic microorganisms that need to be exposed to continuous aeration conditions, is not fully expressed, and thus, it is difficult to treat nitrogen in particular when the temperature decreases in winter.

In order to solve these problems, the design of the aeration tank was relatively large in designing the process, resulting in an uneconomical problem in which the initial facility investment cost was high.

In addition, since the process was developed for the general sewage treatment with high biodegradability, it is almost impossible to apply the waste water having high concentration of hardly decomposable organic matter, and especially high nitrogen concentration in the influent.

The present invention solves the above problems, by removing the nitrogen by the nitrification of ammonia nitrogen in aeration conditions and the denitrification in anoxic conditions through internal transport, and the phosphorus discharge in anaerobic conditions through the sludge circulation and The purpose is to remove phosphorus from sewage water by using excessive phosphorus absorption under aeration conditions.

In other words, the composition of the bioreactor is arranged in the order of anaerobic, anaerobic and aerobic tanks, and in order to make the best use of organic matter in denitrification for denitrification, and to control the imbalanced C / N ratio due to the characteristics of the influent, the amount of outside suitable for influent characteristics and target water quality. The nitrogen source returned from the aerobic tank is completely denitrified by inputting an organic source, thereby providing perfect anaerobic conditions in the anaerobic tank to maximize phosphorus release by dephosphorized microorganisms and to simultaneously absorb nitrogen and phosphorus under the subsequent aerobic conditions. It is characterized by efficient processing.

1 is a block diagram of a wastewater treatment apparatus according to the present invention.

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

1 is a schematic diagram of a wastewater treatment apparatus according to the present invention, an anoxic tank for maximizing nitrogen removal rate by inputting an external organic source in an amount suitable for influent characteristics and target water quality;

An anaerobic tank in which the anaerobic tank provides a more complete anaerobic condition by a high rate of denitrification reaction, thereby maximizing phosphorus release by dephosphorus microorganisms;

Under the following aerobic conditions, by over-absorbing phosphorus, the concentration of phosphorus in the water is drastically reduced, and the rate of nitrification is enhanced by the aerobic sludge transport to improve the activity of nitrifying microorganisms, which are completely aerobic microorganisms. Biological nitrogen and phosphorus simultaneous removal technology characterized in that it is configured to efficiently reduce the nitrogen concentration in the water by high rate denitrification in an oxygen-free tank.

And, in order to minimize the loss of microorganisms due to the microbial overflow and stabilization of the treated water quality at the rear end of the aerobic tank, a microbial loss prevention plate is installed within the hydraulic retention time of 0.5 to 2.0 hours based on the aerobic backside treated water overflow portion And, through the height and inclination of the microbial loss prevention plate to maintain the desired concentration of microorganisms. The height of the microbial loss prevention plate is to operate in the range of 5% to 50% based on the aeration tank level, the angle of the inclined plate is applied in the range of 0 ° to 45 ° from the water perpendicular angle.

An internal return pipe for denitrification is installed between the aerobic and anoxic tanks.

Sludge conveyance is accomplished by installing anoxic tank sludge return from the settling tank sludge to the anoxic tank end for phosphorus removal and denitrification, and aerobic tank sludge transport from the clarifier basin sludge to the aerobic tank end in consideration of the improvement of nitrification rate by providing continuous aerobic conditions of nitrifying microorganisms. .

The present invention configured as described above is configured to be easy to apply to the existing treatment facility bar, in particular, for the purpose of more easily and efficiently processing nitrogen, which is difficult to process, the composition of the biological reaction tank anaerobic, It was arranged in order of anaerobic and aerobic tanks.

That is, the nitrogen in the water is stably removed through nitrification of ammonia nitrogen under aerobic conditions and denitrification of nitric oxide through internal transport under anoxic conditions;

Phosphorus was released under anaerobic conditions following sludge transfer and excess phosphorus absorption under aerobic conditions was used to remove phosphorus from wastewater.

At this time, to maximize the removal rate of nitrogen by injecting the organic material in the influent in an amount suitable for the characteristics of the influent and the target water quality in order to maximize the denitrification and to control the imbalanced C / N ratio due to the characteristics of the influent.

Looking at the wastewater treatment process of the present invention made of a configuration as described above are as follows.

A first step in which the hardly decomposable high molecular weight organic material in the influent is decomposed into low molecular weight organic materials that are easily decomposed while passing through an anaerobic tank and an anaerobic tank;

Total anitrogen concentration in water by denitrification by introducing denitrified organic sources other than organic matter in the inflow water from outside through an aerobic tank and internal return that nitrifies ammonia nitrogen, which accounts for more than 80% of the total nitrogen in the influent water Reducing the second step;

The process was configured to be discharged under anaerobic conditions by dephosphorization microorganisms through sludge return, and to carry out over-absorption under anaerobic conditions and to drastically reduce phosphorus concentration in water.

The second step further includes a nitrification and microbial return process from the settling tank to the aerobic tank tip in order to improve sludge transfer and nitrification rate from the settling tank to the anoxic tank for denitrification in the anoxic tank.

In order to operate the above process more efficiently, a microbial loss prevention wall is installed at the end of the aerobic condition to minimize overflowing microorganisms and to easily control the concentration of microorganisms so that the target water quality can be treated more stably. Complementary

The present invention made by the above process has solved the problem of nitrification microorganism activity which has been traditionally problematic in the existing high-treatment process in consideration of the microbiological physiological characteristics, by installing the return sludge from the sedimentation basin to the aerobic tank end only By forming a microbial community that circulates internally, it is possible to stabilize nitrogen removal by enhancing the adaptability of nitrifying microorganisms and improving microbial activity, i.e. allowing stable treatment at all times regardless of seasonal effects, and thus, particularly in winter It fundamentally solved the problem of nitrogen removal, which suffers from treatment difficulties, and at the same time enabled more stable treatment through stable microbial colonization and adaptation.

In particular, in the case of high nitrogen concentration wastewater, the flocs are generally lighter than activated sludge, resulting in a large amount of microorganisms. Therefore, it is difficult to maintain a certain amount of microorganisms, which makes it difficult to stabilize the operation of the demonstration facility. By minimizing the amount of microorganisms overflowed and controlling the amount of microorganisms suitable for inflow and target water quality, the target water quality can be easily adjusted according to the target.In particular, the high concentration of microorganisms allows stable and high rate treatment with minimal reactor design. By making it possible, it also created the effect of reducing the initial capital investment. In real-world plant operations, this operating technology has proved to be quite simple and effective in practical economic and efficient terms.

Therefore, the present invention has an advantage that it is easy to apply even in the case of non-degradable organic matter and high concentration nitrogen-containing plant wastewater having a lot of difficulties in treatment as well as general sewage and wastewater, it is possible to satisfy the stable treated water quality.

As described above, the present invention can be easily applied to non-degradable organic matter and high concentration nitrogen-containing plant wastewater, which have many difficulties in treatment as well as general sewage and wastewater, thereby providing an advantage of satisfying stable treated water quality.

Claims (8)

An oxygen-free tank for maximizing the denitrification rate by inputting an external organic source in an amount suitable for the influent characteristics and the target water quality of the organic matter and the deficient organic source in the influent by the denitrification microorganism by the internal transport and the nitrification and sludge transport; An anaerobic tank provided with a more perfect anaerobic condition by the high rate denitrification reaction in the anoxic tank, thereby maximizing the phosphorus release rate by dephosphorus microorganisms; By absorbing excess phosphorus discharged through the anaerobic tank, it removes phosphorus from wastewater and maintains high concentration of microorganisms by controlling the return of nitrifier microorganisms and microbial loss prevention plate so that high rate of nitrification is achieved by using the minimum reactor volume regardless of seasonal effects. Sewage water treatment apparatus by biological reaction of high concentration nitrogen-containing wastewater, characterized in that comprising an aerobic tank that is kept stable. The method of claim 1, At the rear end of the aerobic tank, a wastewater treatment apparatus according to a biological reaction of high concentration nitrogen-containing wastewater, characterized in that the loss prevention plate is provided to prevent the loss of microorganisms, and to facilitate the appropriate control of the concentration of microorganisms. The method of claim 1, Between the aerobic tank and the anoxic tank, the wastewater treatment apparatus by biological reaction of the high concentration nitrogen-containing wastewater, characterized in that the inner conveying pipe is installed to return the nitrogen oxide of the aerobic tank to the oxygen-free tank to lower the nitrogen concentration in the influent. The method of claim 1, Between the sedimentation tank and the aerobic tank tip, by installing a microbial circulation tube that is exposed only to aerobic conditions to optimize the nitrifying microbial activity of aerobic microorganisms to maintain a stable nitrification rate, wastewater treatment apparatus by biological reaction of high concentration nitrogen-containing wastewater. The method of claim 1, The sewage tank and the anaerobic tank, a sludge return pipe for denitrification and dephosphorization is installed to maintain a certain concentration of microorganisms in the anaerobic tank and anaerobic tank characterized in that the wastewater treatment apparatus by biological reaction of high concentration nitrogen-containing wastewater. A first step in which the hardly decomposable high molecular weight organic material in the influent is decomposed into low molecular weight organic materials which are easily decomposed while passing through an anaerobic tank and an anaerobic tank; A second step of maximizing phosphorus release by dephosphorus microorganisms in an anaerobic tank rear end anaerobic tank in which nitric oxide by internal transport is denitrated in an anaerobic tank and provided with perfect anaerobic conditions by high rate denitrification; Under the aerobic condition, the third step of maintaining high rate of nitrification by the excess phosphorus absorption by dephosphorus microorganisms and the return of nitrification microorganisms at the aerobic tank tip, and the treatment solution which has completed the phosphorus concentration and nitrification reaction is introduced into an anoxic tank through denitrification and finally denitrified. A method for treating sewage water by biological reaction of high concentration nitrogen-containing wastewater, characterized by a treatment flow which reduces nitrogen and phosphorus concentrations in water. The method of claim 6, The second step is a wastewater treatment method by a biological reaction of the nitrogen-containing wastewater, characterized in that further comprising the sludge return to the anoxic tank through the settling tank and the sludge conveying to the aerobic tank. The method of claim 6, The third step is a wastewater treatment method by biological reaction of nitrogen-containing wastewater, characterized in that the microbial loss prevention wall is installed at the rear end of the aerobic tank.