KR20180028262A - Manufacturing System for High Quality Liquid Fertilizer with High Nitrate Nitrogen, No Ammonia Nitrogen and No Suspended Solids - Google Patents

Abstract

The present invention relates to a system for producing a high-quality liquid fertilizer that has no malodors due to absence of ammonium nitrogen; is resistant to putrefaction due to absence of suspended solids; and contains a high concentration of nitrate nitrogen beneficial to crops, from effluent (raw water) from an anaerobic digester that contains a high concentration of ammonia and significant amounts of organic matters. The system for producing a high-quality liquid fertilizer comprises: (A) an organic waste decomposition tank which receives, along with the raw water, internal recycled water from the following aerobic tank to dilute ammonium nitrogen and organic matters and to supply oxygen and nitrate nitrogen, causing the vicinity of an inlet to become a microaerophilic region where consumption of oxygen and decomposition of organic matters take place due to aerobic heterotrophic microorganisms, and due to consumption of oxygen, an anaerobic region is formed toward an outlet, such that partial denitrification takes place due to anaerobic heterotrophic denitrifying microorganisms to further eliminate remaining organic matters, heavy foreign materials and surplus sludge are eliminated through sedimentation due to gravity, and treatment water having organic matters removed therefrom and containing ammonium nitrogen and nitrate nitrogen is produced; and (B) an aerobic reactor which receives the treatment water from the organic waste decomposition tank, and in which the treatment water is aerated, ammonium nitrogen is converted into nitrate nitrogen by aerobic nitrifying autotrophic microorganisms, and nitrate nitrogen are accumulated.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a high-quality liquid production system of high nitrate nitrogen, nitrogen free ammonia and nitrogen free solids.

The present invention relates to an anaerobic digestion tank effluent containing a high concentration of ammonia and a considerable amount of organic matter, which is free of ammonia nitrogen and has no odor, is free of suspended solids and does not decompose, and has high quality liquid fertilizer To a system which is capable of producing the same.

Livestock wastewater containing livestock manure contains nutrients such as high concentrations of solids, organic substances, and organic nitrogen, which are more than several hundred times that of ordinary living wastewater. Therefore, when treated with a general wastewater treatment facility, the efficiency of the water treatment process is inhibited But also to the maintenance of the facility. In particular, when nitrogen and phosphorus are untreated and released to rivers and lakes, algae grow and become a potential cause of COD, and since the oxygen consumption by ammonia nitrogen is very large, it is necessary to treat nitrogen effectively.

In order to treat high-concentration organic wastes such as livestock manure and food waste, techniques for separating solids and composting them and purifying liquid components to make liquid fertilizer (liquid fertilizer) have been developed. Liquefaction is the aerobic and anaerobic fermentation method with advantages and disadvantages as shown in the following table. Recently, with the spread of biogas plant and business, the application of anaerobic digestion process, which is an anaerobic fermentation method that can secure additional energy (methane)

The anaerobic digestion process is called "methane fermentation" because anaerobic microorganisms dissolve and decompose organic matter and release inorganic compounds and digestion gas (biogas). The anaerobic digestion process has attracted much attention because it can recover the methane from the energy source while producing organic waste wastewater.

Ammonia is present in the livestock manure itself, which is the starting material of the anaerobic digestion process. In addition, the organic matter is decomposed in the digestion process and a large amount of ammonia is generated. As a result, the final effluent of the anaerobic digestion process is high concentration (1000 ~ l) of ammonia. It also contains a considerable amount of non-degradable / non-separable fine suspension.

The immature liquid ratio containing such a high concentration of ammonia has the following problems: (1) When applied to the cultivated land, complaints caused by the bad smell occur. ② Ammonia Nitrogen (NH ₄ -N) is converted into nitrate nitrogen (NO ₃ -N) by nitrite bacteria and nitric acid bacteria and then absorbed by crops. However, since ammonia nitrogen is easily depleted from the soil and absorbed by actual crops, the effect as fertilizer is small. ③ In addition, high concentrations of ammonia in soil are harmful to crops.

Therefore, there is a method in which the immature liquid ratio is applied to the crop after harvest of the crop, the ammonia is deaerated by heating the immature liquid ratio, or the immature liquid ratio is stored in the liquid storage tank and aeration is performed for a long period . However, even with this method, there still remains a problem of odor, and there is a disadvantage in that additional additional devices (heating device, aeration device, etc.) are required and energy consumption is large. In addition, according to the long- Is as low as about 0.02 to 0.13%, so that the effect as fertilizer is insignificant.

In anaerobic digestion treated effluent, 10 ~ 20% of organic matter in terms of BOD is finely decomposed and remains in the form of decomposable micro-suspended solids. These solids are transported to the liquid storage tank as it is difficult to precipitate or separate, which gradually precipitates (0.3 to 0.4 m / year) in the process of staying in the liquid storage. In the field, it is a great difficulty to periodically take out these fine precipitates, clean them, and reprocess them.

Patent Document 10-0978125 discloses a method of producing biogas from an anaerobic digestion tank and removing impurities and solids from the extinguishing waste liquid to be stored in a flow rate storage tank and filtering the biogas to be used as a liquid or further subjected to aerobic treatment Gas, liquid production, and wastewater treatment (see FIG. 1A). However, according to this, it is not easy to separate the suspended solids in the anaerobic digestion effluent, and the produced liquid still contains high concentration of ammonia.

Open No. 10-2015-0050749 discloses an anaerobic digestion system in which anaerobic digestion liquid supplied from an anaerobic digestion apparatus is aerated and liquefied in a nitrification apparatus and ammonia is denitrified by conveying a part of the nitrification system treatment solution when the ammonia concentration of the anaerobic digestion apparatus is high, (See Fig. 1B). However, the treated liquid of the nitrification device has dissolved oxygen due to aeration. If it is returned to the anaerobic digestion device, it will disturb anaerobic methane fermentation, and even if denitrification is performed, nitrate nitrogen is removed and ammonia is removed no. In addition, the 'nitrification device' is an apparatus for aerobic anaerobic digestion, so ammonia is deaerated as if it is aerated in a conventional liquid storage tank rather than actual nitrification.

In addition, according to this method, the concentrated filtrate using ultrafiltration (UF) and reverse osmosis (RO) is used as a liquor. Since the concentrated liquor has accumulated salts, it may cause salting when used in the liquor.

Patent No. 10-0978125 Patent Document 10-2015-0050749

The present invention relates to a method for producing a high-quality liquid having a high concentration of nitrate nitrogen and an organic matter such as suspended solids and ammonia nitrogen from an anaerobic digestion tank effluent containing a high concentration of ammonia nitrogen, a low concentration of organic matter and a high concentration of poorly decomposable / System.

In order to achieve the above object, the present invention provides an anaerobic digestion effluent (raw water) containing high concentration of ammonia nitrogen, low concentration organic matter and high concentration of poorly decomposing / non-separable fine suspended solids, (EN) A high - quality liquid production system of nitrogen and non - suspended solids, comprising: (A) mixing the raw feed water with internal return water from the following aeration tank to dilute ammonia nitrogen and organic matter, and supply oxygen and nitrate nitrogen, The anaerobic heterotrophic microorganisms are responsible for the depletion of oxygen and degradation of organic matter by the aerobic heterotrophic microorganisms and the anaerobic - anaerobic zone in the direction of the outflow by oxygen consumption. The remaining organic matter is further removed while it is being raised, and heavy foreign matter and excess sludge Is removed by gravity sedimentation, decomposition of organic materials containing ammonium nitrogen and nitrate nitrogen and the organic matter treatment can produce a removal tank; And (B) an aerobic tank in which the treated water is inflowed and aerated from the organic matter decomposition tank, and ammonia nitrogen is converted into nitrate nitrogen by aerobic nitrification independent autotrophic bacteria to accumulate nitrate nitrogen. Characterized in that it is a high-quality liquid production system of high nitrate nitrogen, non-ammonia nitrogen and non-suspended solids from digester effluent.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to obtain a liquid fertilizer containing nitrate nitrogen at a high concentration without ammonia nitrogen which causes odor from the anaerobic digestion tank effluent and damages crops.

Further, according to the present invention, there is no residual organic matter and suspended matters, so that even when stored for a long time, a stable liquid which is not corrupted or the component remains unchanged can be supplied.

In addition, according to the present invention, it is possible to produce a high-quality livestock having the disadvantages of the conventional livelihood eliminated, so that the material circulation of the livestock and the seaweed can be smoothly performed, thereby solving the environmental pollution problem caused by the livestock manure.

BRIEF DESCRIPTION OF THE DRAWINGS Figs. 1A and 1B are exemplary configuration diagrams of a conventional liquid making system; Fig.
2 is a conceptual diagram of a high-quality liquid production system according to the present invention.
3 is a cross-sectional view showing a specific example of an organic matter decomposition tank in a liquid production system according to the present invention;
4 is a photograph of a pilot plant, which is an application example of the liquid production system according to the present invention.
5A is a graph showing the concentration changes of ammonia nitrogen in influent water and final treated water during the operation period of the pilot plant.
FIG. 5B is a graph showing changes in concentration of nitrate nitrogen in the influent water and the final treated water during the operation period of the pilot plant. FIG.
6A is a comparative photograph of the manure produced in the manufacturing system according to the present invention and the manure according to the prior art.
Figure 6b: Results of analysis of constituents of the manure produced in the manufacturing system according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be described in more detail with reference to the accompanying drawings and application examples. However, these drawings and application examples are merely illustrative of the contents and scope of the technical idea of the present invention, and thus the technical scope of the present invention is not limited or changed. It will be apparent to those skilled in the art that various changes and modifications can be made within the scope of the technical idea of the present invention based on these examples.

As described above, the present invention relates to a high-quality liquid production system including an ammonia-nitrogen-high nitrate nitrogen from an anaerobic digestion tank effluent with little floating matters, and a high-quality liquid production system including an organic matter decomposition tank, an oxic tank and a settling tank. 2 is a conceptual diagram of a high-quality liquid production system according to the present invention.

The anaerobic digester effluent (hereinafter referred to as "raw water" depending on the situation) to be a raw material in the system according to the present invention is prepared by subjecting a liquid component obtained by subjecting high concentration organic waste such as livestock manure or food waste to solid- The effluent discharged contains high concentrations of ammonia (1000 to 8000 mg / L) and low concentrations of organic matter including refractory / non-separable fine suspended solids. The present invention may be treated with the system according to the present invention even though it has undergone any "anaerobic digestion, ie, methane fermentation" process, to treat the anaerobic digester effluent. Since the present invention is not related to anaerobic digestion, a detailed description thereof will be omitted.

In the present invention, in the organic material decomposition tank , ① organic material consumption in the aerobic and anaerobic regions and ② sludge precipitation are performed. This process is explained in detail.

①-1) The high concentration of ammonia in the raw water acts as a toxic substance that interferes with the growth and activity of all the microorganisms in the system (aerobic and anaerobic microorganisms in anaerobic digestion tank and denitrifying microorganisms in aerobic tank). First, the raw water is mixed with a predetermined amount of carrier water containing low-concentration ammonia from the aerobic tank or sedimentation tank to dilute ammonia nitrogen at a high concentration. The mixed amount of the return water is preferably such that the ammonia nitrogen concentration of the mixed influent water is 50 to 250 mg / liter (claim 5). If it is lower than the above range, excessive dilution results in an increase in the organic decomposition tank and the aerobic tank beyond necessity, and thus the treatment efficiency is lowered. If it is higher than this range, the microorganism growth and activity in the organic decomposition tank are inhibited. The return water for dilution may be returned from the oxic tank or may be returned from the settling tank.

Therefore, for example, if the quantity of raw water is Q and the ammonia nitrogen in the raw water is a ㎎ / ℓ, if the ammonia nitrogen concentration of the mixed influent is operated at b ㎎ / ℓ, the flow rate Qr of the return water is expressed by the following equation Lt; / RTI >

On the other hand, in the raw water, organic matter including refractory / oily separating fine suspended solids exists, and the return water from the oxic tank or the settling tank contains dissolved oxygen by nitrate nitrogen and aerobic tank. Therefore, when the mixed water such as the raw water and the return water is introduced, the vicinity of the inlet becomes the micro-exhalation region containing the organic matter, and oxygen consumption and most of the organic matter are decomposed by the aerobic heterotrophic microorganism.

①-2) An oxygen-anaerobic region is formed in the direction of the outlet by this oxygen consumption. In this anoxic-anaerobic region, the growth and activity of the aerobic heterotrophic microorganisms that have grown in the micro-aerobic region in the former region are stopped, and most of the remaining organic matter is consumed while denitrifying microorganisms (= anaerobic denitrification heterotrophic microorganisms) A part of nitrate nitrogen introduced by the return water is inevitably denitrified. Only a fraction of the nitrate nitrogen (about 20 to 30% according to the application below) is denitrified, since the residual organic matter in the anaerobic-anaerobic zone is very small.

② In the above process, residual or surplus sludge is precipitated and removed by gravity, resulting in treated water containing diluted ammonia nitrogen and almost no organic matter that microorganisms can use.

In the high-quality liquid production system according to the present invention, the dilution of ammonia nitrogen in raw water and the removal of organic matter in the organic material decomposition tank at the beginning of operation are essential conditions of the system according to the present invention.

In the aerobic tank , the treated water flows from the organic matter decomposition tank and is aerated. Ammonia nitrogen in treated water, which has little organic matter, is converted to nitrate nitrogen by aerobic nitrifying biotrophic microorganisms.

On the other hand, the growth rate of aerobic heterotrophic microorganisms is much faster than that of aerobic nitrification independent microorganisms. Therefore, when organic matter is not decomposed in the organic decomposition tank due to various reasons, when a relatively large amount of organic matter is introduced into the aeration tank, the aerobic nitrification microorganisms are ignited and the aerobic nitrification independent nutrient microorganisms disappear. The nitrification is not performed.

According to the present invention, in order to remove micro-suspended solids and microbial flocs remaining in the reaction water (liquid) in the aerobic basin, effluent from the aerobic basin flows in, and undissolved suspended solids and microbial flocs are precipitated and removed And a settling tank or separation membrane in which the liquid is separated can be additionally provided (claim 2). At this time, a part or all of the return water to the organic material decomposition tank for dilution of raw water may be introduced from the settling tank or separation membrane treatment water. At this time, the sludge from the settling tank can be returned to the organic material disassembling tank (claim 3) in order to further consume the sludge settled in the settling tank and to further provide the microorganism in the organic material disintegrating tank. In the following application examples, all of the settled sludge was returned (claim 4). It is preferable that the sludge conveying amount Qs is 0.5 to 1 of the normal raw water inflow amount Q. [

According to the present invention, the ammonia nitrogen in the raw water is converted to nitrate nitrogen in almost all cases (99% or more in the application example) in the aerobic tank. The nitrate nitrogen produced in the aerobic tank is mixed with the raw water again with the return water, and the ammonia nitrogen in the raw water is converted again into nitrate nitrogen. In this process, part of the nitrate nitrogen is denitrified in the organic material decomposition tank, but most of it is circulated continuously and nitrate nitrogen can be accumulated up to about 3000 mg / l.

Further, the liquid production system according to the present invention is excellent in buffering ability and operates very stable and uniformly even if there is an impact load (sudden change in concentration of ammonia in raw water or sudden change in water quantity). That is, even if the TN of the raw water changes suddenly after the system is stabilized, the ammonia nitrogen in the solution according to the present invention It can be seen that nitrate nitrogen can be stably maintained at a high concentration of 1500 to 2500 mg / L at a low concentration of 20 mg / L or less, and thus a high quality liquid containing ammonia nitrogen-high nitrate nitrogen can be obtained Reference).

The reaction water (= effluent = liquor) in the aerobic tank or the settling tank contains no energy sources for the survival of the autotrophic microorganisms and virtually no organic matter for the heterotrophic microorganisms to survive so that the biologically inert Can be stably maintained. Also, because there is almost no ammonia nitrogen, there is no odor and nitrate nitrogen which is a useful fertilizer component does not disappear.

Therefore, the liquid fertilizer produced according to the present invention has little change in the composition of the safflower (except that the amount of the suspended solids is reduced) even after passing through the following settling tank, and can be stored in the storage tank for a long period of time without oxygen- It has the advantage of being not corrupted or denatured even when packaged and stored / distributed.

It is preferable that the concentration ratio of the ammonia nitrogen and the nitrate nitrogen is 1: (40 to 150) in the high quality slurry produced by the slurry production system according to the present invention.

On the other hand, as described above, in the organic decomposition tank of the liquid production system according to the present invention, the micro-organism → anaerobic → anaerobic region is formed from the inlet where the mixed water such as raw water and the return water flows, to the outlet through which the reaction water flows. In order to ensure that such an area is well defined, it is preferable that the organic decomposition tank is a plug-flow type in which the reaction water uniformly flows in a layer direction from the inlet to the outlet. The organic decomposition tank is more preferably an upflow type reaction tank in which inflow water is uniformly distributed and supplied from the lower horizontal surface of the reaction tank to form an upward flow and the treated water flows out to the upper end of the reaction tank.

According to this upflow type reaction tank, first, the mixed liquid such as raw water and return water is uniformly distributed in the cross-sectional area through the distribution pipe at the bottom of the reaction tank to form an upward flow. As the mixed solution flows from the lower part to the upper part of the reaction tank, oxygen and organic matter consumption, fine exhaust-inorganic-anaerobic area formation, and denitrification occur. These upflow type reactors are advantageous in that less energy is consumed in mixing by applying a natural fluid type mixing method instead of mechanical forced mixing. Also, the upflow type reaction tank has an advantage that the primary settling tank, the denitrifying tank, and the thickening tank are simultaneously operated.

A specific example of such an upflow type reaction tank is shown in Fig.

Wherein the organic material decomposing tank comprises: an inflow portion located in a lower portion of the organic material decomposition tank and having an upwardly directed outflow hole; A mixing unit having a vertical main shaft rotating in the organic material decomposing tank and a mixing blade provided on the main shaft in the horizontal direction; An outlet having a radial weir structure located above the organic material decontamination vessel so that the treated water can flow out to the downstream end; And a sludge collecting unit disposed under the organic decomposition tank to collect the sludge precipitated by gravity generated in the reaction process (claim 9).

That is, as described above, the organic matter decomposing tank includes an inlet portion, an outlet portion, a mixing portion, and a sludge accumulating portion. Furthermore, in order to mix well the raw water (anaerobic digestion tank effluent) and the feed water from the aerobic tank or the settling tank (including the transport sludge conveyed from the settling tank by the driving force of the sludge return pump in some cases) An inlet may be provided in the lower outer side of the vessel.

The inlet is located in the lower part of the organic decomposition tank and allows the mixture to flow evenly into the lower part of the organic decomposition tank. For example, stainless steel or synthetic resin materials such as PVC, PE, and PP may be used for durability. In this case, Is preferably used.

The effluent is located in the upper part of the organic decomposition tank and is designed to allow the reaction water containing some matured sludge sufficiently mixed in the reaction process to flow out to the downstream aeration tank. It prevents clogging by the sludge, It is preferable that the weir is formed in a radial shape with respect to the center. Such outlet is in a form capable of uniformly collecting and discharging the reaction water, and can be made of the same material as a general steel sheet. However, stainless steel or a synthetic resin material such as PVC, PE, or PP can be used.

The mixing section is composed of a vertical main shaft rotating in the organic material decomposing tank and one or a plurality of mixing blades installed on the main shaft in the horizontal direction. For example, mixing blades of about 3 to 6 are provided at regular intervals of about 0.5 to 1 m in the main axis of the organic matter decomposition tank to prevent the drift of the reaction water and stir the reaction water continuously, The micro-aerobic-anaerobic-anaerobic region is continuously maintained between the outflow portions, so that the decomposition of organic matter including micro-suspended solids due to microorganisms can be efficiently performed.

The sludge formed in the reaction process in the organic material decomposition tank is collected through the sludge accumulation section to the bottom of the organic matter decomposition tank and discharged to the outside of the reaction tank by the sludge discharge pump.

[ Application example ]

1. Application Method

The potting system according to the present invention was fabricated and tested in a laboratory-grade pilot plant (FIG. 4). Upstream bed type fluidized bed reactor was applied to the organic decomposition reactor.

As the raw water (anaerobic digestion tank effluent) for treatment, anaerobic digestion of livestock manure from Farm B located in Group A was used without any solid - liquid separation. As shown in Table 1 below, samples were taken from 4 sites, and 6 ~ 9 items were analyzed for water quality.

Herein, "influent water" means a reaction water flowing into an inlet of an organic matter decomposition tank, means a diluted mixture when diluting raw water, and raw water when diluted.

The system was operated for about six months from April 15, 2014 to October 5, 2014, with the operating parameters and operating modes shown in Table 2 below. In the table, the dilution factor means the dilution factor of the raw water, and the dilution is gradually reduced as the effluent water in the first to third period and as the effluent water in the fourth to seventh period, . Each component concentration in the table is the concentration of the raw water.

The MLSS of the influent was 6,000-8,000 mg / L and the water temperature was maintained at 20 ~ 25 ℃. The oxic tank DO was 2.0 mg / L or more, and the pH of the aerobic tank was adjusted to 6.5 ~ 8.5 by adding sodium hydroxide.

2. Results Analysis

(1) Water quality analysis

The water quality during the driving period was as shown in Table 3 below.

(2) Removal efficiency

The removal efficiency of the pilot plant during the operation period is shown in Table 4 below. Removal efficiency refers to the rate at which the concentration at the initial influent is removed from the final treated effluent for a particular analytical item.

As shown in the table, treatment efficiency was 87.0% for COD _Cr , 51.5% for TN, 99.1% for NH ₄ ⁺ -N and 59.8% for TP, respectively. Most of organic matter and total nitrogen (more than 90%) were removed from the organic decomposition tank.

The concentration of ammonia nitrogen (NH ₄ ⁺ -N) in influent and final treated water during the operation period was measured and shown in FIG. 5A. As shown in the tables and figures, more than 99% of the ammonia nitrogen (1000 ~ 5000㎎ / ℓ) present in the raw water was removed as the system stabilized within 5 days of the plant operation and the final treated water Only a trace amount (an average of 20 mg / liter or less) remains.

(3) Nitrate production rate

Figure 5b shows the concentration of nitrate nitrogen (NO ₃ ^- N) in influent and final treated water during operation.

As can be seen in the figure, the concentration of NO ₃ ^- N in the treated water (= liquid) is continuously increased during the operation period and accumulated at about 2,000 mg / L or more. Also, when the treated water is transported during the operation period (the 'transport water dilution zone' in the figure), nitrate is circulated and the concentration is further accumulated.

(4) Analysis of phosphorus and organic matter removal efficiency of the system according to the present invention

In the system according to the present invention, the average influent and effluent water quality of T-P was 297 mg / L and 126 mg / L, respectively, which showed an average treatment efficiency of 59.8%.

COD _Cr was injected at an average of 13,487 mg / L as the raw water, and the effluent was effused to an average of 1,020 mg / L. The removal efficiency ranged from 72.6 to 95.3%, which was 87.0% on average. Since most COD _Cr in the anaerobic digestion tank effluent (= raw water) is mostly due to the refractory / oily separating fine suspended solids, most of the degradable / oily separable fine suspended solids are consumed in the system of the present invention, Lt; RTI ID = 0.0 > liquid). ≪ / RTI > Actually, the MLSS (Mixed Liquor Suspended Solids) of the final treated water (= Liquid) according to the present invention was 3,120-15,380 mg / L, with an average of 6,774 mg / L, Able to know.

(5) Analysis of the stability and efficiency of the system according to the present invention

As can be seen from Table 1 above, during the operation of the pilot plant, the concentration of raw water 67% (7th period) is increased sharply to 100% (8th period) It gave a strong shock load in the way of reducing it from 15 days to 15 days.

5a to 5b, the ammonia nitrogen of the treated water is not rapidly increased or the nitrate nitrogen is not abruptly reduced, so that the liquid production system according to the present invention can be operated in a very stable manner .

Also, the treatment efficiency remained stable even though the concentration of the mixed influent gradually increased from about 17% to 100% of the raw water during the operation and the residence time gradually decreased from about 80 to about 15 days. This means that if the action volume is kept constant during the operation, the processing capacity can be greatly increased.

(6) Analysis of quality of liquid

6A is a photograph of the liquid (i.e., final treated water) produced by the liquid production system of the present invention and the liquid stored in the aerobic liquid storage tank for 6 months in the livestock manure anaerobic digestion liquid of the B farm located in the A group Respectively. As can be seen from the photograph, it can be seen that the liquid fertilizer prepared according to the present invention is in a state of much more transparently purified since there is almost no suspended solids compared with the conventional method. In addition, the liquid fertilizer according to the present invention had no odor because there was almost no ammonia, and the organic matter was not consumed and remained.

In addition, the quality of the slurry produced by the present invention was analyzed by commissioning the Agricultural Technology Application Foundation, which is a domestic fertilizer-approved testing institution (see FIG. 6B).

According to this, 0.2% of nitrogen, 0.019% of phosphoric acid and 0.23% of carly were found to be 0.449% in total. This is because the ratio of nitrogen, phosphorus, and potassium of the liquid level is much higher than that of 0.3%. Further, in the liquid level according to the present invention, more than 99% of nitrate Nitrogen.

Therefore, it can be seen that the utility value of the liquid produced by the liquid production system of the present invention is very high.

11. Inflow section 11a. Outflow ball
12. Mixing section 12a. Spindle 12b. Mixed wing
13. The outlet
14. Sludge compartment

Claims (9)

A system for producing a high quality livestock product from anaerobic digestion tank effluent (raw water) containing organic matter including high concentration of ammonia nitrogen and refractory / egg detachable fine suspended solids, high nitrate nitrogen, no ammonia nitrogen and no suspended solids,
(A) the raw water is mixed with the internal return water from the following aeration tank, dilution of ammonia nitrogen and organic matter, and supply of oxygen and nitrate nitrogen are performed, so that the vicinity of the inlet becomes a micro-exhalation region containing organic matter, Oxygen consumption and organic matter decomposition are caused by microorganisms,
An oxygen-anaerobic region is formed in the direction of the outlet by oxygen consumption, and some denitrification is caused by the anaerobic heterotrophic denitrifying microorganism, and the remaining organic matter is further removed,
Heavy foreign matter and excess sludge are precipitated and removed by gravity,
An organic matter decomposition tank containing ammonia nitrogen and nitrate nitrogen and producing treated water from which organic matter has been removed; And
(B) an aerobic tank in which treated water is inflowed and aerated from the organic matter decomposition tank, and ammonia nitrogen is converted into nitrate nitrogen by aerobic nitrification independent autotrophic bacteria, and nitrate nitrogen is accumulated;
Characterized in that the anaerobic digester effluent comprises high nitrate nitrogen, no ammonia nitrogen and no suspended solids.
The method according to claim 1,
(C) a sedimentation tank or separation membrane into which the effluent from the oxic tank is introduced and the undifferentiated suspended solids and microbial flocs are precipitated and removed and the liquid ratio is separated,
Characterized in that the return water from the anaerobic digestion tank to the organic matter decomposition tank is introduced from an aerobic tank, a sedimentation tank or separation membrane treatment water, and a high quality liquid production system of high nitrate nitrogen, no ammonia nitrogen and non-suspended solids from the anaerobic digestion tank effluent.
3. The method of claim 2,
Characterized in that the sludge from the settling tank is conveyed to the organic matter decomposition tank so as to further provide a microorganism in the organic matter decomposition tank, characterized in that the high quality liquor production system of high nitrate nitrogen, ammonia nitrogen free and suspended solids from the anaerobic digestion tank effluent .
The method of claim 3,
Characterized in that at least 50% of the sediment sludge is conveyed from the anaerobic digester effluent to the high nitric acid nitrogen, no ammoniacal nitrogen and no suspended solids.
5. The method according to any one of claims 1 to 4,
The flow rate of the internal return water from the oxic tank or the settling tank,
Wherein the concentration of the ammonia nitrogen in the mixed influent water flowing into the organic matter decomposition tank is 50 to 250 mg / L, and the high-quality liquid fertilizer is produced from the anaerobic digestion tank effluent with high nitrate nitrogen, no ammonia nitrogen and no suspended solids. system.
5. The method according to any one of claims 1 to 4,
The high-
Wherein the concentration ratio of ammonia nitrogen and nitrate nitrogen is 1: (40-150). 2. The system of claim 1, wherein the concentration of ammonia nitrogen and nitrate nitrogen is 1: (40-150).
5. The method according to any one of claims 1 to 4,
The organic decomposition tank
Characterized in that the influent water flows from the inlet to the outlet in the direction of the outlet, characterized in that the reactor is a layered fluidized-bed reactor in which the effluent flows uniformly from the inlet to the outlet and from the anaerobic digester effluent to the anaerobic digester effluent for high nitrate nitrogen, no ammonia nitrogen and no suspended solids.
8. The method of claim 7,
The organic decomposition tank
Characterized in that the inflow water is uniformly distributed and supplied from the lower horizontal plane of the reaction tank to form an upward flow and the treated water flows out to the upper end of the reaction tank. High quality liquid production system of solids.
9. The method of claim 8,
The organic decomposition tank
An inflow portion having a plurality of outflow holes located at a lower portion inside the organic material decomposition tank and facing upward;
A mixing unit having a vertical main shaft rotating in the organic material decomposing tank and a mixing blade provided on the main shaft in the horizontal direction;
An outlet having a radial weir structure located above the organic material decontamination vessel so that the treated water can flow out to the downstream end; And
A sludge collecting unit disposed under the organic decomposition tank and collecting the sludge precipitated by gravity generated in the reaction process;
Characterized in that the anaerobic digester effluent comprises high nitrate nitrogen, no ammonia nitrogen and no suspended solids.

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