KR0116808Y1 - Nitrification reactor of waste water containing ammonia - Google Patents

Abstract

The present invention relates to an ammonia-containing wastewater nitridation apparatus which stabilizes biochemical oxygen demand (BOD) and chemical oxygen demand (COD) and efficiently nitrates the treated ammonia-containing wastewater using biofilm method.

The present invention is a wastewater supply device having a raw water tank and a wastewater supply pump for storing wastewater: containing a wastewater provided by the wastewater supply device therein, and having a stir bar and agitator to prevent deposition of sludge, A reactor having a compressor for supplying oxygen, a flow meter, and a plurality of diffusers, and a plurality of synthetic resin media interwoven with each other: a warmer having a water heater and a circulation pump for maintaining a constant wastewater temperature in the reactor; and It provides an ammonia-containing wastewater oxidization reaction apparatus comprising: a precipitation device for precipitating and discharging the treated water flowing out of the tank.

Description

Ammonia-containing Wastewater Nitrification Reactor

1 is a block diagram showing an ammonia-containing waste water oxidation reaction apparatus according to the present invention

2 is a block diagram of a porous medium used in the ammonia-containing wastewater nitrification apparatus according to the present invention.

＊ Explanation of symbols for main parts of drawing

10 Reactor 12 Synthetic Resin Medium

15: waste water supply device 20: stirring bar (stirrer bar)

25 Compressor 31 Heating Device

40: precipitation device

The present invention relates to an ammonia-containing wastewater nitrification apparatus which stabilizes biochemical oxygen demand (BOD) and chemical oxygen demand (COD) and efficiently nitrates the treated ammonia-containing wastewater using a biofilm method.

Conventionally, biological processes for simultaneously treating contaminants (BOD, COD) and ammonia compounds are carried out in two stages of reaction tanks, oxidative decomposition of organic substances by maintaining a fluidized bed in the first reactor, and in the second reactor. It is known to install a stationary phase and to nitrify. In this case, however, two reactors must be managed separately, and if the efficiency of the first reactor is poor, the second reactor has a problem that nitrification can hardly be expected. These methods treat wastewater or municipal sewage with relatively low concentrations. It's used a lot. However, municipal sewage and sludge treatment water containing a large amount of industrial wastewater has a high content of pollutants and ammonia compounds.

It is quite difficult to apply it as it is. In order for nitrification to occur, carbon compounds must be decomposed first, and nitrification is only possible when BOD conversion is less than 20 mg / ll. Therefore, the decomposition of organic matters is an important factor for nitrification. When the concentrations of organic and ammonia compounds are high, nitrite oxidation proceeds in the reactor,

It is measured. Nitrite nitrite 1mg is converted to COD 1.14mg, which raises the COD of the treated water, and the fixed phase carrier frequently closes and desorptions, so that dissolved oxygen is not dispersed and sludge is deposited. It is very likely to increase the concentration of ammonia, and the processing time is likely to be long.

The present invention is to solve the above problems, by using the biofilm method to increase the concentration of microorganisms in the reaction tank to remove the organic matter and nitrification of ammonia in one reaction tank at the same time, clogging and desorption phenomenon of the biofilm on the fixed bed The purpose of the present invention is to provide ammonia-containing wastewater nitrification apparatus that prevents the microorganisms and maintains the microbial concentration.

In order to achieve the above object, the present invention is an ammonia-containing wastewater nitrification apparatus, a wastewater supply apparatus having a raw water tank for storing wastewater and a wastewater supply pump containing wastewater provided by the wastewater supply unit therein, and depositing sludge Reactor having a stirring bar (stirrer bar) and a stirrer to prevent, supplying oxygen therein and a flow meter and a plurality of said pipes, and a plurality of synthetic resin mediums in a row, built-in: a waste water temperature in the reactor According to the present invention, there is provided a heating apparatus having a water heater and a circulation pump, and a precipitation apparatus for precipitating and discharging the treated water flowing out of the reaction tank. Hereinafter, the present invention will be described in more detail with reference to the drawings.

1 shows a wastewater nitrification apparatus 1 according to the present invention. The wastewater nitrification reaction apparatus 1 includes one reactor 10 having a predetermined size, and in the reactor 10, a plurality of synthetic media 12 are woven in a row to form a plurality of blas to fix the batch. do. The resin medium 12 has a plurality of pores 12a in the form of a loofah as shown in FIG. 2, made of synthetic resin plastic, and stratified to approximately 50% of the contents of the reactor 10.

Accordingly, 50% of the fixed bed and 50% of the fluidized bed are formed in the reactor 10. The wastewater supply device 15 for supplying wastewater into the reactor 10 includes a raw water tank 16 for storing wastewater and a wastewater supply pump 17.

In addition, a stirring bar 20 and an agitator 22 are installed below the reaction tank 10 to prevent deposition of sludge, and a compressor 25 and a flow meter for supplying oxygen (oxygen) to the inside of the reaction tank 10 ( 27) and a plurality of diffusers 29 are provided. In addition, the heating device 31 for circulating the waste water in the acidic reaction tank 10 to maintain a constant temperature is equipped with a water heater 32 and the circulation pump 35, by precipitating the treated water flowing out of the reaction tank 10 It has a precipitation apparatus 40 which discharges. Reference numeral 42 is a baffle, 16a is an agitator.

When the wastewater is introduced into the reactor 10, the present invention configured as described above can maintain the fixed and fluidized beds in one reactor because the reaction medium 10 is filled with about 50% of the synthetic resin 12. It is possible to maintain high concentration of microorganisms in the fixed phase and does not require return sludge.Effective contact with microorganisms can be achieved through uniform dispersion of contaminants in the reaction tank through the fluidized bed, and organic matter is removed by adjusting pH temperature and stirring speed. And the efficiency of nitrification can be improved. In addition, the scouring pad-type synthetic resin medium 12 occupies about 50% in the reaction tank 10 can improve the settling properties of microorganisms and keep the concentration of microorganisms high, so that the return sludge can be omitted, and in particular, strong nitrifying bacteria Nitrosomonas. As it has very good characteristics for nitrobactor adhesion growth, the treatment time can be shortened by ½ or more compared with the case where no fixed carrier is used, and the treatment effect is also due to the high concentration of microorganisms (kg Bod / kg MLSS B) is lowered, the treatment rate can be increased, and the phenomenon is also strong against the impact load. In the fluidized bed in the reaction tank 10, two acid pipes 29 installed at the bottom promote the activity of bacteria or Voticella through the uniform mixing of inflow water and dissolved oxygen to decompose carbon compounds. Can be accelerated.

In addition, the stirring bar 20 installed at the bottom of the reactor 10 can prevent the roughness due to the deposition of sludge and control the flow in the fluidized bed to increase the thickness and growth of the biofilm attached to the fixed bed surface. It is possible to maintain a suitable concentration of microorganisms in the treatment load in the reaction tank by adjusting the.

In addition, the heating device 31 for circulating the waste water at a constant temperature maintains the waste water temperature at approximately 25 C through the water heater 32 and the circulation pump 35 to improve the reaction efficiency.

As such, the present invention enables the high-efficiency treatment of organic industrial wastewater and sludge treated water containing ammonia through the interaction by arranging the ratio of the fixed and fluidized phases in one reactor at a ratio of 50:50, and the activity of Nittobactor is more effective than Nitrosomonas. This relatively strong prevents the accumulation of nitrite nitrogen and accelerates nitrification to improve the treated water quality. Hereinafter, the effects of the present invention will be described in more detail with reference to Examples.

(Example)

The wastewater used in this experiment was an organic industrial wastewater containing hammonia, and was used to confirm the effect of this paper. The characteristics of the wastewater were as follows: BOD 260mg / 1, COD 330mg / 1, ammonia nitrogen 50mg. / 1.

In the reactor 10, a synthetic scrubber medium 12 having a width of 2.5 cm, a length of 2.0 cm, and a thickness of 1.0 cm was woven in a line as shown in FIG. 1, and 50% was added for fixing microorganisms, and the concentration of DO was 4-6 ppm. Air was maintained to maintain the temperature and the reactor temperature was maintained at 25 degrees, alkali was added to adjust the pH to 8.0-8.3 to ring the pH decrease with the progress of nitrification, the speed of the stirring bar 20 is 80-100 rpm After acclimatizing the activated sludge for 14 days with stirring, the raw water was introduced into the reactor using a wastewater supply pump (17) so that the reaction time was 8-10 hours (BOD volume load 0.2-0.4BOD. Kg / m). At this time, a baffle 42 was installed at the inlet so that the wastewater fell into the bottom for inflow of the inlet completely. As such, the wastewater introduced into the reaction tank 10 is pre-back discharged from the settling tank 40 after the reaction. The treatment was performed continuously for 4 months, and the results of the final treated water are shown in Table 1 below. As shown in Table 1, BOD was 13.0 mg / 1 or less, COD 43 mg / 1 or less, and ammonia nitrogen was 5.8 mg / 1 or less.

The experimental results showed that organic matters can be efficiently removed, and in particular, nitrification of ammonia is well performed.

Table 1. Average concentration of treated water and treated water according to this paper and conventional method

(Unit: mg / 1)

According to the present invention as described above, there is the following effects in the treatment and nitrification of organic matter in ammonia-containing wastewater, such as organic industrial wastewater, sludge treated water.

In other words, by installing the fixed bed and the fluidized bed in a ratio of 50:50 in one reactor, the return sludge in the conventional activated sludge process was omitted, and the control time was reduced by ½ or more by preventing the blockage and detachment phenomenon of the fixed bed biology. Could.

Biochemical Oxygen Demand (BOD) 95% Chemical Oxygen Demand (COD) 87%. The ammonia compound can also nitrify up to 72.8%.

Claims (2)

In the ammonia-containing wastewater nitrification apparatus, a wastewater supply device (15) having a raw water tank (16) for storing wastewater and a wastewater supply pump (17): the wastewater provided by the wastewater supply device (15) is contained therein, and While equipped with a stirring bar (20) and a stirrer (22) to prevent the deposition of, and having a compressor 25 for supplying oxygen therein, a wander meter (27) and a plurality of diffusers (29), Reactor 10 in which a plurality of synthetic resin media 12 are woven in a line: a heating apparatus 31 having a water heater 32 and a circulation pump 35 for maintaining a waste water temperature in the reactor 10: and Ammonia-containing wastewater oxidization reaction apparatus, characterized in that it comprises a precipitation device for precipitating and discharging the treated water flowing out of the reaction tank (10). The ammonia-containing wastewater according to claim 1, wherein the synthetic resin medium (12) is made of synthetic resin plastic having a plurality of scrubber-shaped holes (12a), and is built in as much as 50% of the contents of the reaction tank (10). Nitrification reactor.