KR20000037463A - The sequencing combination of anaerobic, oxic and anoxic vessels for effective denitrification and dephosphorus in waste water - Google Patents

Abstract

PURPOSE: A method of removing phosphorus and nitrogen in wastewater is provided, which is characterized in that an aerobic tank, an anaerobic tank, and an anoxic tank are arranged in order. CONSTITUTION: Wastewater including nitrogen compounds like ammonium nitrogen is oxidized in the reaction tank. When the wastewater is watery, an aerobic tank, an anaerobic tank, and an anoxic tank are arranged.(OA2) Phosphorus is absorbed in the aerobic tank, and discharged in the anaerobic tank or the anoxic tank. So, another aerobic tank can be added after the anoxic tank.(OA2O). When the wastewater is highly concentrated, an anaerobic tank, an aerobic tank, an anaerobic tank, and an anoxic tank are arranged. (AOA2) To absorbing phosphorus, another aerobic tank is necessary. So, an anaerobic tank, an aerobic tank, an anaerobic tank, an anoxic tank, and an aerobic tank(AOA2O) are appropriate.

Description

The sequencing combination of anaerobic, oxic and anoxic vessels for effective denitrification and dephosphorus in waste water}

Since high concentrations of manure, landfill leachate, and livestock wastewater contain large amounts of nitrate nitrogen and phosphorus phosphate, the problem of increasing the denitrification and dephosphorization efficiency during wastewater treatment is a focus of attention both at home and abroad. Because of the high nitrogen and phosphorus in the water, algae are generated in fresh water, causing eutrophication in reservoirs and lakes, threatening aquatic ecosystems such as freshwater fish, and causing enormous disruptions in the production of agricultural, industrial and tap water. In addition, salty seawater will create red tide, which will cause enormous damage to coastal fisheries. Therefore, the problem of increasing the efficiency of denitrification and dephosphorization in biological treatment of these wastewaters is very important. However, ammonium ion (NH ⁴⁺⁾ nitrate ion, as shown in, but is currently processing the anaerobic tank is used, these waste water by conventional processes A ² O are sequentially coupled to the anoxic tank and the aerobic tank in the next reaction (NO ₃ ^-) by Oxidation takes place in aerobic tanks, where nitrate ions are reduced to nitrogen and oxygen in anaerobic and anaerobic baths.

----------- Formula (1)

Equation (2)

Equations (1) and (2) are nitrous and nitrification reactions in aerobic tanks, respectively.

------------ Formula (3)

In the first stage of this reaction 1 mole of oxygen is released, in the second stage 3/2 moles of oxygen are released and in the final stage 1/2 mole of oxygen is released, resulting in 3 moles of oxygen in total. Therefore, the reaction of equation (3) is a reaction in which 2 moles of nitrate ions are decomposed to generate 3 moles of oxygen, so this reaction occurs in anaerobic and aerobic tanks. Therefore, in order to achieve an effective denitrification, the current A ² O process, as shown in Equations (1) and (2), is once reduced to nitrogen and oxygen in anaerobic and anaerobic tanks after ammonium ions are oxidized to nitrate in an aerobic tank. If the concentration of wastewater mentioned earlier is dilute, it must be converted to the OA ² process, which is a reverse A ² O process. Therefore, in order to achieve effective denitrification, the current A ² O process should be changed to OA ² process, which is a reverse A ² O process when the concentration of waste water is dilute. And when the concentration of wastewater is high, the high concentration of organic matter must be decomposed beforehand, so the OA ² method should be changed to the AOA ² method which precedes anaerobic tank. And-in is absorbed and released from the anaerobic or anoxic tank in the aerobic tank, if the order to remove the acid property and the ammonium nitrogen that is dissolved in the waste water in the same time effectively the concentration of the waste dilute include OA were added to the aerobic tank to the rear end OA ² Method ² O method should be used, and when the concentration of waste water is high, the most suitable method is AOA ² O method with an aerobic tank connected to the rear of AOA ² method.

However, the conventional A ² O process has a problem in that the ammonia nitrogen purification efficiency is greatly reduced since the aerobic tank in which the ammonium ion is oxidized to nitrate ion does not precede the anaerobic tank / anoxic tank, so that effective removal of nitrate nitrogen is not theoretically possible.

Therefore, the present invention is OA consisting of an aerobic tank / anaerobic tank / anaerobic tank, which is a reverse A ² O process when the concentration of wastewater is low in order to greatly improve the ammonia nitrogen removal efficiency of the so-called A ² O process composed of conventional anaerobic tank / anaerobic tank / aerobic tank ^When the concentration of wastewater is high and the wastewater concentration is high, the technical problem of effectively removing ammonia nitrogen was solved by using an anaerobic tank / aerobic tank / anaerobic tank / anoxic tank (AOA ² ) method. In addition, in order to remove ammonia nitrogen and phosphorus phosphate dissolved in the waste water with high efficiency at the same time, when the concentration of organic matter in the waste water is dilute, an aerobic tank, anaerobic tank, anoxic tank, or aerobic tank (OA ² O) method should be used. In addition, when the concentration of organic matter is high, the technical problem of using anaerobic tank / aerobic tank / anaerobic tank / aerobic tank / aerobic tank (AOA ² O) method has been established, and the theoretical basis for solving the technical problem that the invention intends to achieve is It has been described in detail in the technical field to which the invention pertains and the prior art portion of that field.

1: Biological aerobic tank / anaerobic tank / anaerobic tank (OA ² ) sequential wastewater treatment plan of the present invention.

Figure 2: Biological anaerobic tank / anaerobic tank / anaerobic tank / anaerobic tank (AOA ² ) sequential wastewater treatment plan of the present invention.

3: biological aerobic tank / anaerobic tank / anaerobic / aerobic tank (OA ² O) sequential wastewater treatment plan of the present invention.

Figure 4: Biological anaerobic tank / aerobic tank / anaerobic tank / anaerobic / aerobic tank (AOA ² O) sequential wastewater treatment plan of the present invention.

<Explanation of symbols for main parts of drawing>

(1) (14) (29) (44)-wastewater inlet

(2) (15) (30) (45)-First settler

(3) (16) (31) (46)-First settling sludge

(4) (18) (32) (35) (48) (51)-Aerobic tank

(5) (17) (19) (33) (47) (49)-anaerobic tank

(6) (20) (34) (50)-Anaerobic tank

(7) (21) (36) (52)-Final Settler

(8) (22) (37) (53)-Effluents

(9) (23) (38) (54)-final sedimentation sludge

(10) (24) (37) (39) (55)-surplus sludge

(11) (25) (40) (56)-conveying sludge pipe

12, 13, 26, 27, 28, 41, 42, 43, 57, 58, 59, 60

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

FIG. 1 is a biological aerobic / anaerobic tank / Oxygen tank (OA ² ) sequential wastewater treatment plan, where wastewater from which relatively large substances contained in the wastewater are removed while passing through a fine screen for a sufficient time in the initial settler (2) through the inlet (1) Progress the precipitation by gravity. At this time, the first settling sludge (3) to be settled separately. The wastewater after the first precipitation is introduced into the aerobic tank (4) to oxidize the ammonium ions to nitrate ions as shown in the reaction formula (1) and (2). The treated aerobic tank (4) is introduced into the anaerobic tank (5) through the mixed liquid circulation path (12). Here, the treated water treated under anaerobic conditions is introduced into the anaerobic tank (6) through the mixed liquid circulation path (13). At this time, in the anaerobic tank 5 and the anoxic tank 6, the nitrate ions are reduced to nitrogen and oxygen and decomposed as in the reaction of the formula (3). The treated water of the oxygen-free tank 6 is transferred to the final settler 7 to coagulate or to separate the sludge using a filter. At this time, a part of the final sedimentation sludge 9 is returned to the aerobic tank 4 through the sludge conveying pipe 11 to supplement the insufficient feed of activated sludge, and the remaining excess sludge 10 is squeezed with a belt press and processed into a cake.

Figure 2 is a biological anaerobic tank / anaerobic tank / anaerobic tank / anaerobic tank (AOA ² ) sequential wastewater treatment plan in the inflow path 14, the first settler 15, the function of the first settling sludge (16) is shown in (1) (2) (3) of FIG. ) Is the same as the function. When the concentration of organic matter in the waste water is high, the anaerobic tank 17 is digested under anaerobic conditions and then transferred to the aerobic tank 18 through the mixed liquid circulation path 26. This reduces the load on the exhalation tank 18. 2 added an anaerobic tank 17 to the front end of FIG. 1 for this purpose. The mixed liquid circulation passages 27 and 28 have the same functions as those of Figs. 12 and 13, respectively. The role of the anaerobic tank 19 and the anaerobic tank 20 is the same as (5) and (6) of FIG. In addition, the functions of (21) (22) (23) (24) and (25) are the same as the functions of (7) (8) (9) (10) and (11) of FIG.

Figure 3 is a biological aerobic tank / anaerobic tank / anaerobic / aerobic tank (OA ² O) sequential waste water treatment plan (29) (30) (31) function is the same as the function of (1) (2) (3) of FIG. In general, when the concentration of organic matter in waste water is low, or when the concentration of organic matter is greatly reduced by physicochemical pretreatment, an aerobic tank 32 is provided at the front of the anaerobic tank 33 and the anoxic tank 34 to react formulas (1) and (2). As suggested, oxidizing ammonia nitrogen to nitrate nitrogen is a method for effectively removing ammonia nitrogen. At this time, an aerobic tank should be installed at the rear end of the anaerobic tank 34 in order to simultaneously remove phosphoric acid phosphorus. The functions of the remaining (41) (42) and (43) are the same as or similar to the functions of (12) and (13) of FIG. And the role of (36) (37) (38) (39) and (40) is the same as the function of (7) (8) (9) (10) and (11) of FIG.

Figure 4 is a biological anaerobic tank / anaerobic tank / anaerobic tank / anaerobic / aerobic tank (AOA ² O) sequential wastewater treatment plan (44) (45) and (46) is the function of (1) (2) and (3) of FIG. Is the same as In general, when the concentration of organic matter in the waste water is high, an anaerobic tank 47 is attached to the front end of the aerobic tank of FIG. 3 to decompose organic matter anaerobicly to reduce the load of the aerobic tank 48 of the next step. Reference numeral 57 is the same as 26 in FIG. 2, and the functions 48 and 60 correspond to those of 32 to 43 in FIG. 3. Sequential biological wastewater treatment as shown in Figure 4 is the most effective method for biological treatment of ammonia nitrogen and phosphate phosphorus when the concentration of organic matter in the waste water.

In general, wastewater containing high concentrations of ammonia nitrogen and phosphate phosphorus, such as manure, landfill leachate and livestock wastewater, which are very biologically difficult to treat, is a highly efficient method for removing nitrogen and phosphorus from wastewater. The effect of developing nitrogen alone or nitrogen and phosphorus at the same time according to the concentration of was obtained. Referring specifically to the effects of the invention as follows.

In order to biologically remove ammonia nitrogen (NH ₃ -N) and phosphate phosphorus (PO ₄ -P) such as high concentrations of manure, landfill leachate, and livestock wastewater, which have very high concentrations of organic matter, digestion and the anoxic tank in sequence, but the processing of these waste water in a so-called O ² a step of providing the aerobic tank to, ammonium ion (NH ⁴⁺⁾ nitrate ion (NO ₃ ^-) to the oxidation in the aerobic tank to get up from the anaerobic and anoxic This nitrate ion is reduced to nitrogen and oxygen and decomposed. Therefore, the current anaerobic / anoxic / aerobic tank (A ² O) process when a is a concentration of the waste water mentioned above diluted to achieve an effective denitrification is changed in reverse A ² O processes of aerobic tank / anaerobic / anoxic tank (OA ²⁾ Method do. If the concentration of waste water is high, the anaerobic tank, aerobic tank, anaerobic tank, and anaerobic tank (AOA ² ) method should be replaced with the anaerobic tank prior to OA ² method. And since phosphorus is absorbed in an aerobic tank and released in an anaerobic or anoxic tank, to effectively remove dissolved ammonia nitrogen and phosphate phosphorus in the waste water, if the concentration of the waste water is dilute, the end of the aerobic / anaerobic tank / oxygen tank (OA ² ) method The aerobic tank / anaerobic tank / anaerobic tank / aerobic tank (OA ² O) method should be used with the addition of an aerobic tank.If the concentration of waste water is high, the anaerobic tank / aerobic tank / anaerobic tank / aerobic tank / aerobic tank (with an aerobic tank connected to the rear of the OA ² O method) The effect of the invention that the AOA ² O) method became the most suitable method was obtained.

Claims (4)

A method of treating wastewater by an aerobic / anaerobic / oxygen-free tank (OA ² ) method which has a low concentration of wastewater and effectively removes ammonia nitrogen from the wastewater. A method of treating wastewater by an anaerobic tank, aerobic tank, anaerobic tank, and anoxic tank (AOA ² ) method which has a high concentration of wastewater and effectively removes ammonia nitrogen from the wastewater. A method of treating wastewater by an aerobic, anaerobic, anaerobic, and aerobic (OA ² O) process that has a low concentration of wastewater and effectively removes ammonia nitrogen and phosphorus phosphorus in the wastewater. A method of treating wastewater by an anaerobic / aerobic / anaerobic / aerobic / aerobic (AOA ² O) process that has a high concentration of wastewater and effectively removes ammonia nitrogen and phosphorus phosphorus in the wastewater.