JP6530196B2 - Method and apparatus for treating ammonia containing wastewater - Google Patents

Description

  The present invention relates to a method and apparatus for treating ammonia-containing wastewater, and more particularly to a method and apparatus for treating ammonia-containing wastewater at high speed.

  Food factories and chemical factories emit ammonia from low to high concentrations. These ammonia waste solutions cause eutrophication of the water area and a decrease in dissolved oxygen, and the need for treatment is strongly desired.

  In general, many biological treatments are performed in medium-high ammonia concentration treatment, and they are converted to nitrogen gas by nitrification reaction and denitrification reaction using microorganisms. Ammonia is oxidized to nitrous acid and nitric acid by nitrification reaction by nitrifying bacteria, and nitrous acid and nitric acid are denitrified and removed by denitrifying bacteria. In these reactions, the nitrification reaction is rate-limiting, so the efficiency of the nitrification reaction has been studied. Maintaining high concentration of nitrifying bacteria in the treatment tank makes it possible to improve efficiency of the nitrification reaction, and in order to maintain high concentration, raising the concentration of nitrifying bacteria by the carrier injection method, biofilm method of the carrier used and comprehensive fixation Examination of the conversion method is being conducted.

As high-speed processing in the nitrification reaction, for example, it is described in Non-Patent Document 1 that it can be processed at a nitrification speed of 1.1 kg-N / m ³ / day. Further, Non-Patent Document 2 describes that a nitrification rate of 1.2 kg-N / (m ³ · day) can be obtained.

M. Miyake et al., 3 others, high-speed nitrogen treatment by formation of nitrification denitrification granules, 47th Annual Meeting of Japan Society on Water Environment, 2013, p. 266 Nakamura, Yasuhiro, 9 others, nitrogen removal from sludge dewatered liquid using anaerobic ammonia oxidation, 47th Annual Meeting of the Japan Society on Water Environment, 2013, p. 156

In recent years, it has been desired to carry out the nitrification treatment at an even faster rate. However, there is a limit to the amount of nitrifying bacteria retained by the carrier, and at the time of high load operation of ammonia, the treated water is extremely deteriorated, and at present, good treatment does not progress at all. Also in the processing methods described in Non-Patent Documents 1 and 2, sufficient processing speed has not been obtained. For this reason, in the design of sewage treatment, the nitrification rate was about 0.2 to 0.3 kg-N / m ³ / day (corresponding to a carrier filling rate of 10%, a nitrification rate of 417 mg-N / h / L-support).

  As described above, in the conventional nitrification treatment, there is a limit to increasing the concentration of nitrifying bacteria, and in the high load operation of ammonia, ammonia remains in the treated water, and sufficient treatment performance has not been obtained.

  The present invention has been made in view of such circumstances, and can treat ammonia-containing wastewater with a high concentration of nitrifying bacteria and can always obtain stable treated water. Intended to be provided.

In order to achieve the above object, the present invention adheres nitrifying bacteria to a carrier by acclimating nitrifying bacteria in the presence of the carrier using a solution having an ammoniacal nitrogen concentration of 200 mg / L or more and 1000 mg / L or less, Ammonia-containing to treat wastewater at a nitrification rate of 1.0 kg-N / m ³ / day or more and 2.0 kg-N / m ³ / day or less in a wastewater treatment tank that has been grown to form an immobilized carrier and has an immobilized carrier. Provide a method of treating wastewater.

According to the present invention, by allowing the nitrifying bacteria to be acclimated in the presence of the carrier using a solution containing a high concentration of ammoniacal nitrogen concentration, the highly active nitrifying bacteria can be attached to the carrier at high concentration and grown. The ammonia-containing wastewater can be treated at a high nitrification rate of 1.0 to 2.0 kg-N / m ³ / day.

  By performing acclimatization using a liquid containing an ammoniacal nitrogen concentration at a high concentration, the diffusion-limited of the substrate component which is a nutrient component necessary for acclimatization is reduced, and the concentration of nitrifying bacteria can be increased.

In another aspect of the present invention, it is preferable that the amount of cells of nitrifying bacteria attached to and grown on the immobilized carrier is 2 × 10 ¹⁰ copies / g-carrier or more, as measured by the real-time PCR method. .

According to this aspect, since the amount of cells attached to the immobilized carrier is 2 × 10 ¹⁰ copies / g-carrier or more as a value measured by the real-time PCR method, high nitrification speed can be obtained.

  In another aspect of the invention, the carrier is preferably polyvinyl alcohol and its derivatives.

  According to this aspect, polyvinyl alcohol and its derivative are used as a carrier, and polyvinyl alcohol and its derivative are porous and can attach a large amount of nitrifying bacteria. In addition, since polyvinyl alcohol and its derivatives have good affinity to nitrifying bacteria, it is possible to increase the concentration of nitrifying bacteria and to improve the nitrification rate.

  In another aspect of the present invention, in the waste water treatment tank filled with the carrier before conditioning, the ratio of the immobilized carrier after conditioning is 5% to 30% based on the total of the carrier and the carrier for immobilization. It is preferable to mix and start up the wastewater treatment.

  According to this aspect, it is possible to shorten the start-up time by mixing and using the conditioned carrier and the pre-conditioned carrier at the start-up of the wastewater treatment.

In order to achieve the above object, the present invention adheres nitrifying bacteria to a carrier by acclimating nitrifying bacteria in the presence of the carrier using a solution having an ammoniacal nitrogen concentration of 200 mg / L or more and 1000 mg / L or less, A pretreatment tank for growing to form an immobilized carrier, and the immobilized carrier formed in the pretreatment tank, containing 5% or more and 30% or less of the total carrier, and a carrier in which the other carrier is a non-living carrier before conditioning is added An apparatus for treating ammonia containing wastewater, comprising: a wastewater treatment tank treating at a nitrification speed of 1.0 kg-N / m ³ / day or more and 2.0 kg-N / m ³ / day or less.

According to the present invention, in the pretreatment tank, the nitrifying bacteria is acclimated in the presence of the carrier using a solution containing ammonia nitrogen at a high concentration of ammonia nitrogen concentration of 200 mg / L to 1000 mg / L. Thus, the nitrifying bacteria can be attached and grown on the carrier at a high concentration. And, by performing the nitrification treatment using the carrier containing this carrier in an amount of 5% to 30% of the total amount of the carrier, the time for starting up the processing apparatus can be shortened, 1.0 kg-N Ammonia-containing wastewater can be treated at a nitrification rate of not less than / m ³ / day and not more than 2.0 kg-N / m ³ / day.

In another aspect of the present invention, the amount of cells of the carrier for nitrifying bacteria attached to and grown on the immobilized carrier is 2 × 10 ¹⁰ copies / g-carrier or more, as measured by real-time PCR. Is preferred.

According to this aspect, since the amount of cells adhering to the carrier is 2 × 10 ¹⁰ copies / g-carrier or more as a value measured by the real-time PCR method, high nitrification speed can be obtained.

  In another aspect of the invention, the carrier is preferably polyvinyl alcohol and its derivatives.

  According to this aspect, polyvinyl alcohol and its derivative are used as the carrier, and polyvinyl alcohol and its derivative are porous and can attach a large amount of nitrifying bacteria, so that the nitrification rate can be improved.

  According to the method and apparatus for treating ammonia-containing wastewater of the present invention, with respect to wastewater containing ammonia at a high concentration, nitrifying bacteria can be attached to and grown at a high concentration on a carrier, and stable treated water can always be obtained be able to.

It is a block diagram which shows the processing apparatus of the ammonia containing waste water of 1st Embodiment. It is a block diagram which shows the processing apparatus of the ammonia containing waste water of 2nd Embodiment. It is a figure which shows the relationship between ammonia nitrogen concentration of raw water, and a nitrification rate. It is a figure which shows the relationship between amount of cells (real-time PCR copy number) and nitrification speed. It is a figure which shows a time-dependent change of ammonia containing wastewater and treated water. It is a figure which shows the relationship between volume load and nitrification speed. FIG. 7 is a diagram showing the results of Example 3;

  Hereinafter, a method and an apparatus for treating ammonia-containing wastewater according to the present invention will be described according to the attached drawings. In addition, in this specification, "-" is used in the meaning which includes the numerical value described before and after that as a lower limit and an upper limit.

[Immobilized carrier]
In the present embodiment, the immobilization carrier can be produced by a biofilm method. In the present specification, a conditioned carrier in which nitrifying bacteria are attached to a carrier is also referred to as "immobilized carrier" or "seed carrier", and the carrier before being acclimated is simply "carrier" or "new carrier". It is also called.

  The biofilm method is a treatment method utilizing microorganisms growing on the surface of the carrier, and the carrier and the liquid are supplied by air diffusion by diffusing the carrier by immersing the carrier in water and maintaining an appropriate aeration agitation state. In other words, a gel-like film can be formed that includes the group of microorganisms that grow on the surface of the carrier, that is, a collection of extracellular polymeric substances secreted by these microorganisms.

  As carriers used in the biofilm method, polyvinyl alcohol (PVA) and its derivative, and acetalized polyvinyl alcohol-based gel can be used, and in particular, polyvinyl alcohol (PVA) and its derivative are preferably used.

  As other carriers, vinyl alcohol resins, acrylic resins, acrylamide resins, olefin resins, styrene resins, polyurethane resins, polysaccharides, polyethers, porous inorganic compounds, etc. may be mentioned. Out. Specifically, polymer gels such as PVA type, polyethylene glycol type, polyacrylamide type, calcium alginate, carrageenan, agar, light curing resin, activated carbon, polyurethane sponge, polyacrylonitrile, polyethylene, polypropylene, polystyrene, Cellulose derivatives, polyesters and the like can be used.

  Nitrifying bacteria can be used as microorganisms (bacterial cells) to be immobilized on a carrier. Although nitrifying bacteria may immobilize pure bacteria, activated sludge containing nitrifying bacteria can also be immobilized.

  The shape of the carrier is not particularly limited, but is preferably square, spherical, cylindrical, cord-like, non-woven, or the like. In particular, by increasing the unevenness of the carrier surface, the contact efficiency with the wastewater can be improved and the reaction rate can be improved, which is preferable.

[Waste water treatment equipment]
First Embodiment
The treatment apparatus for ammonia-containing wastewater according to the first embodiment will be described. FIG. 1: is a block diagram which shows the processing apparatus of the ammonia containing waste water of this embodiment. As shown in FIG. 1, the ammonia-containing wastewater treatment apparatus 10 according to this embodiment mainly includes a wastewater treatment tank 14 filled with a carrier 12 and a raw water pipe 16 for flowing ammonia-containing wastewater (raw water) into the wastewater treatment tank 14. A treated water pipe 18 for discharging treated water treated in the waste water treatment tank 14, an aeration means 20 for aerating air in the waste water treatment tank 14, a pH adjustment means 22 for controlling the pH in the waste water treatment tank 14; Composed of In addition, seed sludge containing pure bacteria of nitrifying bacteria or nitrifying bacteria is input to the wastewater treatment tank 14.

  The aeration means 20 includes an air pipe 20A connected to the bottom of the wastewater treatment tank 14 and a blower 20B for supplying air through the air pipe 20A. Then, air is aerated in the waste water treatment tank 14 to form the inside of the waste water treatment tank 14 under aerobic conditions, and to flow the carrier 12 in the waste water treatment tank 14. By causing the carrier 12 to flow under aerobic conditions, microorganisms can be attached and grown on the carrier surface to form an immobilized carrier. In addition, ammonia in the waste water is treated biologically to make nitrous acid and nitric acid by bringing the immobilized carrier into contact with the waste water in the waste water treatment tank 14.

The raw water to be tested in the wastewater treatment tank 14 is a waste solution containing ammonia at a high concentration of 200 mg / L or more and 1000 mg / L or less. By conditioning the waste liquid containing ammonia at a high concentration, highly activated nitrifying bacteria can be attached to the carrier at a high concentration. The adhesion amount of nitrifying bacteria to the carrier is preferably 2 × 10 ¹⁰ copies / g-carrier or more, more preferably 1 × 10 ¹¹ copies / g-carrier or more, as measured by real-time PCR copying method. It is. By making the adhesion amount of the nitrifying bacteria to the carrier equal to or more than the above-mentioned value, treatment of the ammonia-containing wastewater can be constantly and stably performed in the wastewater treatment tank 14. In addition, the nitrification treatment can be performed even at low temperatures.

[Real-time PCR method]
Real-time PCR is a method of measuring cell concentration by gene analysis, and in gene analysis, analysis is performed on genes specific to nitrifying bacteria to measure the number of genes, and the number of genes is further determined from the number of genes. Measure the concentration and number of bacteria.

  The following primers were used for measurement of amoA primer copy number.

Primer name and sequence 5 'to 3'
amoA1f (GGG GTT TCT ACT GGT GGT)
amoA2r (CC CTC KGS AAA GCC TTC TTC)
Further, the copy number per mass of carrier was calculated by the following formula (1).

X = X _O (V _P + V _W ) / V _P (1)
Here, X: number of viable cells inside the carrier (copy / g-carrier)
X _O : viable count of stock solution after pretreatment (copy / mL)
V _P : amount of pretreated support (g)
V _W : Liquid volume used for pretreatment (mL)
As a method of gene analysis, PCR in which a gene is amplified by a primer pair is preferable, and in particular, when amplifying a gene, real-time PCR quantified using a hybridization probe, and MPN-PCR combined with most probable number method Although preferred, other analysis methods may be used.

Second Embodiment
Next, the treatment apparatus of the ammonia containing wastewater of a 2nd embodiment is explained. FIG. 2: is a block diagram which shows the processing apparatus of the ammonia containing waste water of 2nd Embodiment. The ammonia-containing wastewater treatment apparatus 110 of the second embodiment is mainly different from the treatment apparatus of the first embodiment in that a pretreatment tank 124 for pretreatment of the carrier 12 is provided. Then, seed sludge containing pure bacteria of nitrifying bacteria or nitrifying bacteria is introduced into the pretreatment tank 124.

  A raw water pipe 126 for flowing the ammoniacal wastewater into the pretreatment tank 124 is branched from the raw water piping 16 in the raw water piping 16 for flowing the ammoniacal wastewater into the wastewater treatment tank 14. The raw water piping 126 is provided with an on-off valve 128, and the on-off valve 128 controls the supply of ammoniacal wastewater to the pretreatment tank 124. The pretreatment tank 124 is provided with a carrier feeding pipe 130 for feeding a carrier. The carrier charged from the carrier charging pipe 130 is conditioned in the ammoniacal wastewater in the pretreatment tank 124. The pretreatment tank 124 has an aeration means 138, and the carrier is made to flow by aerating air from the aeration means 138 to adhere and grow microorganisms on the carrier surface, thereby forming a species carrier (immobilized carrier) 136. . The ammoniacal nitrogen concentration of the ammoniacal wastewater is 200 mg / L or more and 1000 mg / L or less.

By conditioning the nitrifying bacteria in the presence of the carrier in the pretreatment tank 124, the nitrifying bacteria are adhered to and grown on the carrier. The amount of cells of nitrifying bacteria attached to and grown on a carrier is preferably 2 × 10 ¹⁰ copies / g-carrier or more, more preferably 1 × 10 ¹¹ copies / value, as measured by real-time PCR. It is more than g-carrier. In addition, the acclimation period in the pretreatment tank 124 is preferably 2 weeks to 16 weeks, and more preferably 4 weeks to 12 weeks. By setting the acclimation period to the above range, the desired amount of cells can be retained on the carrier.

  The seed carrier 136 acclimated in the pretreatment tank 124 is fed into the wastewater treatment tank 14 from the conditioned carrier feeding pipe 132. When the wastewater treatment tank 14 of the treatment apparatus 110 is started up, the waste water treatment tank 14 uses the seed carrier acclimated in the pretreatment tank 124 by 5% or more and 30% or less of the total amount of the seed carrier and the new carrier. . Preferably, the proportion of the seed carrier is 10% or more and 20% or less of the total amount. If waste water treatment is performed using only a new carrier in the waste water treatment tank 14 when the treatment apparatus 110 is started, it takes time to obtain sufficient treatment performance. The starting time can be shortened by using a seed carrier as a sludge species at the start-up and mixing it with a new carrier.

  Although the start-up time can be shortened by increasing the proportion of the seed carrier, it is preferable to set the amount of the seed carrier acclimated in the pretreatment tank 124 in the above range, because the cost for producing the seed carrier increases. In addition, even if the amount of accustomed carrier is too large, the effect of shortening the start-up time can not be obtained.

  In addition, it is preferable that the carrier be aerated in the pretreatment tank 124 for about one week. By air aeration, the nitrifying bacteria can be easily attached and grown on the carrier.

  The seed carrier can be conditioned in the pretreatment tank 124 and introduced into the waste water treatment tank 14 as shown in FIG. 2, but in the treatment apparatus as shown in FIG. The same effect can be obtained by mixing and using a carrier that has been treated with waste water into a waste water treatment tank at start-up, by mixing a used seed carrier and a new carrier before being used.

[Waste water treatment method]
The treatment method of the ammonia containing waste water of this embodiment is demonstrated. The ammonia-containing wastewater of the present embodiment is used for wastewater having an ammoniacal nitrogen concentration of 200 to 1000 mg / L. FIG. 3 is a view showing the relationship of the nitrification rate (kg-N / m ³ / day) to the ammoniacal nitrogen concentration (mg / L) of raw water (treated wastewater). The carrier used is a PVA carrier, and the ammonia oxidizing bacteria amoA copy number is data of 1.04 × 10 ¹¹ copies / g-carrier. As shown in FIG. 3, the nitrification rate is 1.8 kg-N / m ³ / day or more and 2.0 kg-N / m ³ / day by treating with raw water having an ammoniacal nitrogen concentration of 200 to 1000 mg / L. The following high nitrification rates can be obtained.

In the present invention, as described above, a high nitrification rate of 1.0 kg-N / m ³ / day or more and 2.0 kg-N / m ³ / day or less can be obtained by using the immobilization support capable of obtaining a high nitrification rate. Waste water can be treated at a speed.

FIG. 4 is a diagram showing the relationship between the amount of cells (real-time PCR copy number) and the nitrification rate. The carrier used is a PVA carrier, and the ammoniacal nitrogen concentration of the raw water is data of 700 mg / L. As shown in FIG. 4, by setting the ammonia oxidizing bacteria amoA copy number to 2 × 10 ¹⁰ copies / g or more, a high nitrification rate of 0.8 kg-N / m ³ / day can be obtained. In addition, by setting the density to 1 × 10 ¹¹ copies / g or more, a nitrification rate of 1.5 kg-N / m ³ / day can be obtained, which is preferable.

FIG. 5 shows the ammoniacal nitrogen concentration (NH ₄ -N) of the raw water of ammoniacal wastewater, the ammoniacal nitrogen concentration (NH ₄ -N) of the treated water, the nitrate nitrogen concentration (NO ₃ -N) of the treated water, and The nitrite nitrogen concentration (NO ₂ -N) of the treated water was measured and plotted in relation to the number of days elapsed for operation (days). The measurement was performed using an immobilized carrier in which the amount of cells is an ammonia-oxidizing bacterium amoA copy number 2.08 × 10 ¹¹ copies / g-carrier and the carrier is a PVA carrier. As shown in FIG. 5, the ammoniacal nitrogen concentration (NH ₄ -N) of the treated water is maintained at a low value for the elapsed days of 20 days or later, and it can be confirmed that stable treated water is obtained. .

Moreover, FIG. 6 is a figure which shows the relationship between volume load and a nitrification speed. In addition, theoretical values in which the ammonia removal rates are 50%, 80%, and 100% are shown by straight lines. The measurement was performed using an immobilized carrier in which the amount of cells is an ammonia-oxidizing bacterium amoA copy number 2.08 × 10 ¹¹ copies / g-carrier and the carrier is a PVA carrier. As shown in FIG. 6, it can be seen that the nitrification speed is improved when the volume load is increased. Further, it can be confirmed that ammonia can be removed by 80% or more by increasing the volume load.

Further, as in the present embodiment, the carrier conditioned with raw water containing high concentration of ammoniacal nitrogen exhibits nitrification activity even at a temperature of 10 ° C. or lower. For example, it has a nitrification rate of 0.1 to 0.5 kg-N / m ³ / day even under conditions of a raw water temperature of 10 ° C. or less. Therefore, by performing the treatment using the carrier of the present embodiment, the nitrification reaction and the denitrification reaction can be performed even at a low temperature, and the waste water treatment can be performed without performing the temperature control of the raw water.

  The present invention will be described in more detail by way of the following examples. However, the present invention is not limited to this embodiment, and the materials, amounts used, proportions, treatment contents, treatment procedures, etc. shown in the following embodiments may be appropriately changed without departing from the spirit of the present invention. it can.

(Example 1) [Treatment of NH ₄ -N 400 mg / L synthetic wastewater]
The process was performed using the apparatus shown in FIG. The PVA carrier (5 mmφ spherical shape) was loaded into a 1.15 L reactor at a loading rate of 13.5%. Two 200 mL portions of activated sludge (seed sludge) were charged into the 1.15 L reactor. Continuous treatment was performed using inorganic synthetic wastewater (NH ₄ -N 400 mg / L) assuming medium-concentration NH ₄ -N-containing wastewater as raw water. The composition of the used inorganic synthetic wastewater is shown in Table 1 below. Also, the pH was constantly adjusted to 7.5 with NaHCO ₃ to prevent the inactivation and death of the nitrifying bacteria due to the lowering of the pH. The water temperature was adjusted to 25 ° C., and the raw water was adjusted to a residence time of 5 to 24 hours to control the load.

Nitrite-type nitrification reaction was shown at a load of 0.56 to 1.20 kg-N / m ³ / d for continuous operation of 30 to 80 days, and treated water quality NH ₄ -N 1 mg / L or less was obtained. As a result of applying a load thereafter, a maximum nitrification rate of 1.95 kg-N / m ³ / d was obtained, and high-speed processing operation was achieved. It is considered that this is because the PVA carrier is porous and the nitrifying bacteria enter the inside of the gel, and it also functions as a comprehensive immobilization carrier, enabling high-speed processing operation.

(Example 2) [Low temperature test]
The carrier used in Example 1 was subjected to a long-term treatment operation at 5 ° C. The synthetic wastewater in Table 1 was diluted on the assumption of nitrification in sewage treatment, and a wastewater of NH ₄ -N ₄₀ mg / L was used. As a result of processing at a residence time of 6 hours, a nitrification rate of 0.16 kg-N / m ³ / day was obtained. Even in the low temperature atmosphere at 5 ° C., it has been confirmed that it has nitrification performance and the treatment performance is excellent.

(Example 3) [Mixing start-up test of new carrier and accustomed carrier]
Next, in the carrier at the time of start-up of the apparatus, the mixing ratio of the carrier after conditioning (seed carrier) and the carrier before conditioning (new carrier) which is an inanimate carrier was examined. As the conditioned carrier, the carrier used in Example 1 was used. A smaller amount of accustomed carrier can be launched at a lower cost.

  The start-up was examined by mixing the pre-adapted carrier, which is an inanimate carrier, with the pre-adapted carrier. The results of the rise of the nitrification activity relative to the proportion of the conditioned carrier in the total carrier are shown in FIG. The test method was carried out in the same manner as in Example 1, and the nitrification rate ratio was plotted against the proportion of the conditioned carrier. The nitrification speed ratio was determined by (Nitrification speed ratio = [Nitrification speed during start-up] / [Nitrification speed of accustomed carrier 100%]), and the nitrification speed after 1, 2, 3 and 4 weeks was measured.

  As shown in FIG. 7, when the amount of the conditioned carrier was 18% or more, no difference was found in the nitrification rate ratio after each time elapsed. Although the start-up time becomes faster when the amount of the acclimatized carrier increases, the cost of the carrier increases, so the amount of the acclimatized carrier is preferably 5 to 30% of the total amount of the carrier, and more preferably 10 to 20%.

  DESCRIPTION OF SYMBOLS 10, 110 ... Treatment apparatus, 12 ... Carrier, 14 ... Waste water treatment tank, 16 ... Raw water piping, 18 ... Treated water piping, 20, 138 ... Aeration means, 22 ... pH adjustment means, 124 ... Pretreatment tank, 126 ... Raw material Water piping, 128: opening and closing valve, 130: carrier feeding pipe, 132: conditioned carrier feeding pipe, 136: seed carrier

Claims (5)

By allowing the nitrifying bacteria to acclimate in the presence of the carrier using a solution having an ammoniacal nitrogen concentration of 200 mg / L or more and 1000 mg / L or less, the nitrifying bacteria are adhered to the carrier and grown to form an immobilized carrier,
The amount of cells of nitrifying bacteria attached to the immobilized carrier and grown is a value of 1 × 10 ¹¹ copies / g or more as measured by real-time PCR .
Wherein the wastewater treatment tank with immobilized nitrifying speed ^{1.6 kg-N / m 3 /} day or more ^2.0kg-N / m 3 / day processing method of ammonia-containing wastewater treated wastewater below. The method for treating ammonia-containing wastewater according to claim 1 , wherein the carrier is polyvinyl alcohol and a derivative thereof. In the wastewater treatment tank filled with the carrier prior to conditioning, the conditioned carrier is mixed at a ratio of 5% to 30% with respect to the total amount of the carrier and the carrier for immobilization, The method for treating an ammonia-containing wastewater according to claim 1 or 2 , wherein startup of the treatment of wastewater is performed. By allowing the nitrifying bacteria to acclimate in the presence of the carrier using a solution having an ammoniacal nitrogen concentration of 200 mg / L or more and 1000 mg / L or less, the nitrification bacteria adhere to the carrier, thereby growing the nitrifying bacteria to form an immobilized carrier. With the tank,
A carrier containing 5% to 30% of the immobilized carrier formed in the pretreatment tank at 5% to 30% of the total amount of the carrier, and the other carrier being an inanimate carrier before conditioning is charged, and the nitrification rate is 1.6 kg-N / m ^And a wastewater treatment tank treating at least ³ / day and not more than 2.0 kg-N / m ³ / day,
The attachment to the carrier for immobilization of the waste water treatment tank, cell amount of nitrifying bacteria grown is a value measured by real-time PCR method, 1 × 10 ¹¹ copies / g- carrier or der Ru ammonia-containing process wastewater apparatus. The treatment device for ammonia-containing wastewater according to claim 4 , wherein the carrier is polyvinyl alcohol and a derivative thereof.

Images