JP2002233889A - Method of removing nitrogen or phosphorus in waste water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the nitrogen and phosphorus of a high concentration discharged from a water treatment facility to a public water basin and to provide a method of effectively utilizing industrial wastes and alcoholic beverage residues. SOLUTION: The method of forming condensed water 22 by drying and thickening the alcoholic beverage residues and decreasing or removing the nitrogen or phosphorus from waste water 21 containing the nitrogen or phosphorus of the high concentration by using the resultant condensed water and organisms, in which the organisms contain microorganisms, more preferably >=1 of the microorganisms formed by acclimatizing activated sludge or phosphorus accumulated bacteria, nitrifying bacteria or denitrifying bacteria. An example by a circulating nitrifying liquid 34 using a denitrification reaction chamber 25, a nitrification reaction chamber 28 and a nitrification chamber 29 is shown.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of removing nitrogen or phosphorus by biological treatment of waste water containing a large amount of nitrogen or phosphorus, such as domestic wastewater, industrial wastewater, and livestock wastewater.

[0002]

2. Description of the Related Art Wastewater treatment facilities mainly use microorganisms to remove organic substances, which are pollution sources. However, when the wastewater contains a large amount of nutrients such as nitrogen and phosphorus, the nutrient components are discharged to public waters while remaining, and eutrophication in lakes and marshes and closed seas has become a major environmental problem. As a countermeasure against these, a chemical is used, and it is known in publications and literatures that methanol is used for removing nitrogen and an aluminum-iron coagulant is used for removing phosphorus. On the other hand, the residues generated during the production of alcoholic beverages are being considered for use as fertilizers and feed, but most of them are treated as industrial waste, such as dumping into the ocean, causing environmental problems.

[0003]

The problems to be solved are to reduce high-concentration nitrogen and phosphorus discharged from the conventional wastewater treatment facility to public waters, and to effectively use liquor residue as industrial waste. It is a point of utilizing.

[0004]

SUMMARY OF THE INVENTION The present invention provides a method for drying and concentrating liquor residue to produce condensed water, and using the obtained condensed water and organisms to remove nitrogen from wastewater containing high concentrations of nitrogen or phosphorus. Alternatively, it is a method of reducing or removing phosphorus. This is a method for reducing or removing nitrogen or phosphorus from wastewater containing high concentrations of nitrogen or phosphorus, based on a new idea of further adding condensed water containing a large amount of BOD and the like that should be removed. That is,

[0005] In this method, condensed water is generated from the residue generated during the production of alcoholic beverages, and is added to wastewater coexisting with living organisms to remove nitrogen or phosphorus from the wastewater. It is also preferable to adopt a method of producing and adding this to wastewater coexisting with living organisms to remove nitrogen or phosphorus in the wastewater. The coexisting organism is one that has acclimated to microorganisms, preferably activated sludge. Alternatively, these methods may be used, in which the organism contains at least one selected from microorganisms, preferably phosphorus-accumulating bacteria, nitrifying bacteria, or denitrifying bacteria.

In the method of adding condensed water directly to the activated sludge treatment facility, the condensed water is added to the activated sludge treated water coexisting with the activated sludge as a post-treatment of the activated sludge treatment facility. May be used. In this method, the heat retention temperature is 5 to 40C, preferably 20 to 30C.
° C, and the amount of organic matter in the mixed wastewater to which condensed water is added is BO
D volume load is 0.1 to 2.0 g-BOD / l.day, preferably 0.3 to 0.8 g-BOD / l.day, and the amount of nitrogen in the mixed waste water is 0.03 to 1.0g-N
/ L · day, preferably 0.1-0.3 g-N / l · day, and the residence time of the mixed wastewater in the activated sludge reactor is 4-48.
Time, preferably 6 to 24 hours, the sedimentation time after the reaction is 2 to 10 hours, preferably 4 to 8 hours, and the pH of the activated sludge reaction tank is 5 to 10, preferably 6.5 to 8.
The method of removing nitrogen or phosphorus in these wastewaters by adjusting to 5 is more preferable.

Further, as a pretreatment of the wastewater treatment facility, the capacity ratio between the denitrification reactor and the nitrification reactor is 1: 1 to 1:10.
Using a nitrification liquid circulation denitrification device kept at a certain temperature,
The mixed wastewater to which condensed water was added and the circulating nitrification solution from the nitrification reaction tank were mixed, and the mixture was flowed into a denitrification reaction tank containing phosphorus-accumulating bacteria, and subjected to a denitrification reaction by the denitrification bacteria.
Denitrification treatment water of 50 mg / l or less flows into the nitrification reaction tank, a nitrification reaction by nitrifying bacteria is performed while adjusting the pH, a part of the reaction is released as treated water, and the remainder is used as a circulating nitrification liquid. Alternatively, a method of removing nitrogen or phosphorus in wastewater may be used.

In this method, the reaction temperature is 5 to 40.
° C, preferably 25 to 37 ° C, and the organic matter content of the mixed wastewater to which condensed water was added was 0.1 to 2.0 in terms of BOD volume load.
g-BOD / l.day, preferably 0.3-0.8 g-B
OD / l · day, and the nitrogen amount of the mixed wastewater is 0.01 to 1.0 g-N / l · day, preferably 0.0
At 3 to 0.3 g-N / l day, the volume ratio of the mixed wastewater to which condensed water is added and the circulating nitrification liquid from the nitrification reaction tank is 1: 1 to 1
1:20, preferably 1: 3 to 1: 5, and the residence time in the denitrification reactor is 0.5 to 24 hours, preferably 1 to 1 hour.
2 hours, and the residence time in the nitrification reaction tank is 1.5 to 9
A method for removing nitrogen or phosphorus in these wastewaters, which comprises adjusting the pH of the nitrification reactor to 5 to 10, preferably 6.5 to 8.5 for 6 hours, preferably 5 to 36 hours, is described. More preferred. When the BOD exceeds 300 mg / l, nitrifying bacteria are unlikely to become the dominant species.

[0009] The residue generated during the production of alcoholic beverages is dried and concentrated using a dryer / concentrator. At that time, condensed water is obtained by condensing the vaporized gas. If the concentration of nitrogen and phosphorus discharged from the wastewater treatment facility to public waters exceeds the wastewater standard,
Diluted or returned to wastewater treatment facility. If the primary treatment water obtained by treating high-concentration wastewater with a nitrification liquid circulating denitrification device does not reach the standard, the secondary treatment is performed using a multistage type nitrification solution circulating denitrification device connected to the same type. Nitrogen and phosphorus concentrations in treated water can be reduced or removed below the reference value.

Sake, beer, liqueur,
Various types of sake and shochu. Examples of shochu include potato shochu, wheat shochu, rice shochu, sesame shochu, fly shochu, corn shochu, and brown sugar shochu. Examples of the dryer include a vapor thin film indirect dryer, a vacuum dryer, a vacuum dryer, a drum dryer, a spray dryer, an infrared dryer, a hot air dryer, a constant temperature dryer, and a blast dryer. Examples of the concentrator include a vacuum concentrator and a vacuum distillation concentrator.

The obtained condensed water is made of organic carbon (TO)
C) an aqueous solution mainly containing acetic acid and ethanol,
As the value of 3 to 5 and the chemical oxygen consumption (COD)
Is 1000-9000 mg / l and the biological oxygen consumption (BOD) is 3000-25000 mg / l. Inorganic carbon (IC), total nitrogen (TN), total phosphorus (TP), etc. are extremely small. The creatures, most of them, reeds, reeds, microorganisms,
Bacteria, activated sludge, and the like, and microorganisms containing at least one selected from phosphorus accumulating bacteria, nitrifying bacteria, or denitrifying bacteria, or activated sludge are preferable. Wastewater refers to domestic wastewater, industrial wastewater, agricultural wastewater, livestock wastewater, methane fermentation wastewater, etc., and includes treated water from wastewater treatment facilities containing high concentrations of nitrogen or phosphorus components. Wastewater shall also include wastewater.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION In waste water containing a large amount of nutrients such as nitrogen and phosphorus, it has been realized that nitrogen and phosphorus can be efficiently removed by biological treatment by further adding and mixing condensed water.
Hereinafter, the method of the present invention will be described with reference to examples, but the present invention is not limited to the following examples.

[0013]

EXAMPLES Example 1 100 kg of potato shochu residue was dried at 90 ° C. using an indirect steam thin-film dryer (apparatus: Cyclone Dryer, manufactured by Okadra Co., Ltd.). The steam generated at this time was condensed at 20 ° C. and collected, and 82 l of so-called condensed water was obtained. The obtained condensed water was analyzed using a liquid chromatograph, a gas chromatograph, a nitrogen / phosphorus analyzer, and a total carbon / total nitrogen analyzer in accordance with JIS K102. The results are shown in Table 1.

Example 2 Using a vacuum concentrator, 50 kg of barley shochu residue was concentrated at a can pressure of 450 mmHg and a product temperature of 70 ° C. The steam generated at this time was condensed at 20 ° C. and collected, so that 35 l of so-called condensed water was obtained. The condensed water obtained was analyzed using a liquid chromatograph, a gas chromatograph, a nitrogen / phosphorus analyzer, and a total carbon / total nitrogen analyzer in accordance with JIS K0102. The results are shown in Table 1.

[0015]

[Table 1]

Example 3 2.0 liters of activated sludge collected from a meat factory was applied to an acrylic batch activated sludge reaction tank 3.0.
l. 3.0 l of condensed water from the potato shochu residue obtained in Example 1 was diluted 7-fold and mixed with methane fermentation wastewater. The mixed wastewater BOD concentration was adjusted to 1300 mg / l. This was put into a reaction tank in an amount of 0.3 l, and acclimated for 7 days.
Next, a nitrogen concentration of 234 mg / l and a phosphorus concentration of 17.1 mg / l
1.0 l of the above mixed wastewater containing 1 l was supplied daily and aerated for 16 hours for biological treatment. After settling for 8 hours, 1.
0 l was discharged, and 1.0 l of mixed waste water was further charged, and biological treatment was performed for 7 days. As a result, the mixed waste water was treated water having a nitrogen concentration of 49 mg / l and a phosphorus concentration of 4.0 mg / l, and 79% and 77% of nitrogen and phosphorus could be removed, respectively.

[Comparative Example 1] Wastewater without condensed water was prepared with the same BOD concentration and a nitrogen concentration of 1170 mg / l and a phosphorus concentration of 85 mg / l. The wastewater was charged 1.0 l each day and aerated for 16 hours for biological treatment. After settling for 8 hours, 1.0 liter of the supernatant was discharged, and 1.0 liter of newly discharged water was added to carry out biological treatment for 7 days. As a result, nitrogen and phosphorus could be removed by 11% and 5%, respectively.

[Example 4] Except that 2.0 L of condensed water from the potato shochu residue obtained in Example 1 was diluted 9 times and mixed with methane fermentation wastewater to adjust the BOD concentration to 1100 mg / L. The same processing as in Example 3 was performed. Nitrogen concentration 117
As a result of biological treatment of mixed wastewater having a concentration of 8.5 mg / l and a concentration of 8.5 mg / l, the nitrogen concentration of the treated water was 22 mg / l and the phosphorus concentration was 0.8 mg / l, and the removal rates were 81% and 91%, respectively.
And has been removed with even higher efficiency.

[Embodiment 5] A nitrification liquid circulation denitrification apparatus is an apparatus in which a denitrification reaction tank and a nitrification reaction tank are connected to each other.
Shown in The denitrification reaction tank is a tower reactor having a capacity of 0.45 l and a height of 55 cm shown in FIG. The mixed wastewater to which condensed water from the barley shochu residue obtained in Example 2 was added was supplied to a denitrification reaction tank by a liquid feed pump controlled by a timer. The temperature of this tank was maintained at 35 to 37 ° C. with warm water. Activated sludge from the night soil treatment plant was charged, and the denitrifying bacteria were acclimated for 3 weeks. The nitrification reaction tank is a submerged filter bed type nitrification reaction tank using a meshed cylindrical body (curl for hair) with a diameter of 10 mm and a length of 15 mm made of polypropylene and polystyrene as a fixing material for fixing nitrifying bacteria. , Porosity 90%, reaction volume 1.
35 l. 2.5 l of activated sludge from the night soil treatment plant was charged into 2.5 l of the nitrification tank, and the nitrifying bacteria were acclimated for 3 weeks. The temperature in the nitrification reactor was kept at 28 to 30 ° C. by a ceramic heater, and the pH was controlled to 7.4 to 8.0 using a 5% sodium hydrogen carbonate solution or a 1N hydrochloric acid solution. The dissolved oxygen in the nitrification reactor was controlled at 2 mg / l or more. The mixed wastewater having a BOD concentration of 2080 mg / l, which is obtained by mixing the above-mentioned wheat condensed water and methane fermentation wastewater, is mixed with 0. 0 mg / l daily.
The solution was supplied to a 9 l nitrification liquid circulation denitrification apparatus. After being treated in the denitrification reaction tank and the nitrification reaction tank, it is circulated as a circulating nitrification solution at a rate of 4.5 l / day (volume ratio 1: 5), combined with the mixed wastewater and supplied again to the denitrification reaction tank for biological treatment. The removal rates of nitrogen and phosphorus were determined. As a result, the nitrogen removal rate was 80% and the phosphorus removal rate was 46%.

Example 6 Condensed water from the barley shochu residue obtained in Example 2 was added to livestock wastewater (nitrogen concentration 2650 mg / l) and mixed, and the BOD concentration was 1680 mg / l and the nitrogen concentration was 5
The mixture was adjusted to a mixed wastewater having a concentration of 30 mg / l and a phosphorus concentration of 16 mg / l. The adjusted mixed wastewater is supplied to the denitrification reaction tank at a rate of 0.9 l / day, then sent from the denitrification reaction tank to the nitrification reaction tank, and 3.6 l / day (volume) (Ratio 1: 4) The mixture was circulated, mixed with the mixed waste water, and then supplied again to the denitrification reaction, and subjected to biological treatment to conduct a nitrogen and phosphorus removal test. The nitrogen concentration of the treated water was 132 mg / l, the removal rate was 75%, the phosphorus concentration was 9.2 mg / l, and the removal rate was 43%.

Example 7 The same mixed waste water as in Example 6 was prepared. The adjusted mixed wastewater is supplied to the denitrification reaction tank at a rate of 0.9 l / day, and then sent from the denitrification reaction tank to the nitrification reaction tank.
/ Day (volume ratio 1:16), and after merging with the mixed wastewater, the mixture was supplied again to the denitrification reaction to carry out biological treatment. As a result, the nitrogen removal rate of the treated water was 65% and the phosphorus removal rate was 30%.

[Comparative Example 2] Livestock wastewater was diluted with ordinary water, and the BOD concentration was 750 mg / l and the nitrogen concentration was 530 mg.
/ L and phosphorus concentration were adjusted to 16 mg / l. The nitrogen concentration of the treated water is 408mg /
1 and the removal rate was 23%, and the others were much as nitrate nitrogen and remained in the treated water. The phosphorus removal rate was 11% at a phosphorus concentration of 14.2 mg / l. As a result, 1
/ 3 low removal.

Example 8 Condensed water obtained by drying wheat shochu residue with an indirect dryer was used. This condensed water and factory wastewater are mixed, and a BOD concentration of 1500 mg / l and a nitrogen concentration of 1
A mixed wastewater containing 70 mg / l and a phosphorus concentration of 17.1 mg / l was prepared. 1.0 l of the mixed sample was placed in a batch activated sludge reactor every day and subjected to biological treatment by aeration for 16 hours. After standing for 8 hours, the supernatant was discharged and 1.0 l of the supernatant was discharged. The biological treatment was carried out for 7 days by charging 0.01. As a result of the treated water on the seventh day, the nitrogen concentration was 25.5 mg.
The removal rate was 85% at 1 / l and 77% at a phosphorus concentration of 4.0 mg / l.

[Comparative Example 3] Factory wastewater was diluted with ordinary water, and the BOD concentration was 550 mg / l and the nitrogen concentration was 276 mg.
/ L and the phosphorus concentration were adjusted to 16.5 mg / l in the same manner as in Example 7. Nitrogen concentration of treated water is 171m
g / l: 38% removal rate, phosphorus concentration: 13.8 mg / l
6% removal.

[Embodiment 9] Fig. 3 shows a multistage nitrification liquid circulation denitrification apparatus. This is a device obtained by further connecting the device of the fifth embodiment. The first mixed wastewater obtained by mixing the wastewater and the condensed water is subjected to biological treatment in the first denitrification reaction tank and the first nitrification reaction tank to become primary treated water. Further condensed water is added and mixed to form a second mixed wastewater, and biological treatment is performed in a second denitrification reaction tank and a second nitrification reaction tank,
It becomes secondary treated water. The secondary treatment water was circulated and, after merging with the second mixed wastewater, supplied again to the second denitrification reaction to carry out biological treatment. In addition, if the nitrogen concentration of the secondary treatment water is lower than the regulation value, it does not circulate. The denitrifying bacteria in the denitrification reaction tank and the nitrifying bacteria in the nitrification reaction tank were each acclimated and subjected to biological treatment in the same manner as in Example 5. Condensed water from sweet potato shochu was added to the marine processing wastewater, and 0.9 L of mixed wastewater having a BOD concentration of 1,400 mg / l, a nitrogen concentration of 351 mg / l, and a phosphorus concentration of 25.6 mg / l was supplied daily to carry out biological treatment. The primary treated water biologically treated in the denitrification reaction tank and nitrification reaction tank has a nitrogen concentration of 105 mg / l and a phosphorus concentration of 1
It was 4.7 mg / l. The above-mentioned condensed water was further added to and mixed with the primary treated water, and the second mixed wastewater whose BOD concentration was readjusted to 930 mg / l was biologically treated. As a result, it became secondary treatment water having a nitrogen concentration of 9.0 mg / l and a phosphorus concentration of 9.5 mg / l, and could be largely removed.

[0026]

As described above, the present invention can reduce high-concentration nitrogen and phosphorus discharged from a conventional wastewater treatment facility into public waters, and has been dumped into the ocean as industrial waste. The liquor residue was effectively used. The present invention provides a method of drying and concentrating liquor residue to produce condensed water, and using the obtained condensed water and organisms to reduce and remove nitrogen or phosphorus from wastewater containing high concentration of nitrogen or phosphorus. You can see that there is. This means that by applying this method to a conventional wastewater treatment apparatus, advanced treatment for removing nitrogen and phosphorus can be performed. As a result, the generation of red tide and blue water can be suppressed, and eutrophication measures and water purification can greatly contribute to environmental conservation. It can be seen that this is a method for reducing or removing nitrogen or phosphorus components from wastewater containing high concentrations of nitrogen or phosphorus based on a new idea of further adding condensed water containing a large amount of BOD or the like that should be removed. Alcoholic beverages as industrial waste are dumped in the ocean, causing serious environmental problems. For example, in the Kyushu district,
There are 60,000 tons, and we are having a hard time disposing of them. The condensed water obtained from the liquor residue is 360,000 tons, and can process 6 to 7 million tons of livestock wastewater in Kagoshima Prefecture.

[Brief description of the drawings]

FIG. 1 is a diagram using a batch activated sludge method.

FIG. 2 is a diagram using a nitrification liquid circulation denitrification method.

FIG. 3 is a process diagram using a multi-stage nitrification liquid circulation denitrification method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 activated sludge reaction tank 12 diffuser tube 13 compressor 21 drainage 22 condensed water 23 mixed drainage 24 liquid feed pump 25 denitrification reaction tank 26 warm water 27 denitrification treatment water 28 nitrification reaction tank 29 nitrification tank 30 pH controller 31 ceramic heater 32 Aeration tube 33 Compressor 34 Circulating nitrification liquid 35 Liquid pump 36 Treated water

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 3/34 101 B09B 3/00 303M F-term (Reference) 4D004 AA04 CA42 4D028 CB02 CC01 CD01 CD02 4D040 BB05 BB32 BB57 BB72 CC01 CC02 DD03 DD24

Claims (8)

[Claims] 1. A method for producing condensed water from residues generated during the production of alcoholic beverages, adding the condensed water to wastewater coexisting with living organisms, and removing nitrogen or phosphorus in the wastewater. 2. A method for producing condensed water from residues generated during the production of shochu, adding the condensed water to wastewater coexisting with living organisms, and removing nitrogen or phosphorus in the wastewater. 3. The temperature of the activated sludge reaction tank is 5 to 40 ° C., preferably 20 to 30 ° C., and the amount of organic matter in the mixed wastewater to which condensed water is added is 0.1 to 2.0 g-BO in volume load of BOD.
D / l · day, preferably 0.3-0.8 g-BOD / l
・ It is day, and the nitrogen amount of the mixed wastewater is 0.0
1 to 1.0 g-N / l.day, preferably 0.03 to 0.
At 3 g-N / l.day, the residence time of the mixed wastewater in the activated sludge reaction tank is 4 to 48 hours, preferably 6 to 24 hours, and the sedimentation time after the reaction is 2 to 10 hours, preferably 4 to 4 hours. ~
8 hours, the pH of the activated sludge reaction tank is adjusted to 5 to 10, preferably 6.5 to 8.5, and the organism is one that has acclimated microorganisms, preferably activated sludge.
Either way. 4. A method for removing nitrogen or phosphorus in activated sludge treated water, which comprises adding condensed water to activated sludge treated water in which activated sludge is acclimated as post-treatment of the activated sludge treatment facility. 5. The method according to claim 1, wherein the organism contains at least one selected from the group consisting of microorganisms, preferably phosphorus-accumulating bacteria, nitrifying bacteria, or denitrifying bacteria. 6. A mixed effluent to which condensed water has been added and nitrification using a nitrification liquid circulating denitrification apparatus maintained at a constant temperature in which the volume ratio of the denitrification reaction tank and the nitrification reaction tank is 1: 1 to 1:10. The circulating nitrification solution from the reaction tank is mixed, and the mixture is flowed into a denitrification reaction tank, and subjected to a denitrification reaction by a denitrification bacterium containing a phosphorus-accumulating bacterium.
mg / l or less of denitrification-treated water flows into the nitrification reaction tank,
A method in which a nitrification reaction is performed by a nitrifying bacterium while adjusting the pH, and a part after the reaction is released as treated water, and the remaining part is made into a circulating nitrification liquid, thereby removing nitrogen or phosphorus in wastewater. 7. A reaction vessel having a temperature of 5 to 40 ° C., preferably 2 to 40 ° C.
5 to 37 ° C., and the volume ratio between the mixed wastewater obtained by adding condensed water to the wastewater and the circulating nitrification liquid from the nitrification reaction tank is 1: 1 to 1:
20, preferably 1: 3 to 1: 5, the residence time in the denitrification reactor is 0.5 to 24 hours, preferably 1 to 12 hours, and the residence time in the nitrification reactor is 1.5 to 96 hours,
It is preferably 5-36 hours, and the pH of the nitrification reactor is 5
The nitrification liquor circulation and denitrification method for removing nitrogen or phosphorus in waste water according to claim 6, which is adjusted to 10 to 10, preferably 7 to 8.5. 8. The method for removing nitrogen or phosphorus in waste water according to claim 6, wherein a nitrification liquid circulation denitrification device is connected in multiple stages.