KR200202152Y1 - The sequencing combination of anaerobic, oxic and anoxic vessels for effective denitrification and dephosphorus in waste water - Google Patents

Abstract

At present, high concentrations of organic matter are present because the concentrations of organic matter in these wastewaters are very high to remove ammonia nitrogen (NH ₃ -N) and phosphate phosphorus (PO ₄ -P), such as high concentration manure, landfill leachate, and livestock wastewater. In order to extinguish the wastewater, the anaerobic tank is installed first and then anaerobic tank and aerobic tank are installed in the so-called A ² O process. ) Oxidation to nitric ions (NO ₃ ⁻ ) takes place in an aerobic tank where the nitrate ions are reduced to nitrogen and oxygen in the anaerobic and anaerobic tanks. 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 to be used for aerobic tank was added to the aerobic tank / anaerobic / anoxic / aerobic tank (OA ² O) method, and if the concentration of the waste water, the anaerobic tank is connected the aerobic tank to the rear end AOA ² method / aerobic tank / anaerobic / anoxic / aerobic tank (AOA ² O) The method is the most suitable method.

Therefore, in the present invention, in order to effectively remove ammonia nitrogen, the OA ² method is valid when the concentration of wastewater is low, and the AOA ² method is valid when the concentration of wastewater is high. In order to effectively remove ammonia nitrogen and phosphorus phosphate at the same time, OA ² O is a proper method when the concentration of wastewater is low, and AOA ² O is a suitable method when the concentration of wastewater is high.

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, these wastewaters are treated by the existing A ² O process that is sequentially combined into the anaerobic, anaerobic and aerobic tanks currently used, but as shown in the following reaction, the ammonium ion ( ) Oxidation from nitric acid to nitric acid (NO ₃ ⁻ ) occurs in an aerobic tank where nitrate ions are reduced to nitrogen and oxygen in anaerobic and anaerobic tanks.

----------- 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, high concentrations of organic matter must be decomposed beforehand, so the OA ² method must be changed to the AOA ² method, which is preceded by an 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, in the conventional A ² O process, the aerobic tank for oxidizing ammonium ions to nitrate ions is not preceded by the anaerobic tank / anoxic tank, so that effective removal of nitrate nitrogen is theoretically impossible, and thus, ammonia nitrogen purification efficiency is greatly reduced.

Therefore, the present invention is an OA consisting of an aerobic tank, an anaerobic tank, and an anaerobic tank, which is an inverse A ² O process when the concentration of wastewater is low in order to greatly improve the ammonia nitrogen removal efficiency of a so-called A ² O process composed of a conventional anaerobic tank, anoxic tank, and an 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, if the concentration of organic matter is high, the technical task 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 to be achieved by such a design is It has been described in detail in the technical field to which the invention belongs and the prior art portion of the field.

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

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 the main parts of the drawings>

(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) (39) (55)-surplus sludge

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

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

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

1 is a plan view of a biological aerobic / anaerobic / oxygen tank (OA ² ) sequential wastewater treatment, in which the wastewater from which relatively large substances contained in the wastewater are removed while passing through a fine screen is provided for a sufficient time in the initial settler (2) through the inlet passage (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 water of the aerobic tank 4 treated in this way flows 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 the 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 end of the anaerobic tank 33 and the anoxic tank 34 to the reaction 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, the 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 in 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.

Highly efficient removal of nitrogen and phosphorus from wastewater containing high concentrations of ammonia nitrogen and phosphate phosphorus, such as manure, landfill leachate and livestock waste, which are generally biologically difficult to treat, and organic matter contained in the waste. 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 such a design 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, To treat these wastewaters by the so-called A ² O process of digesting and sequentially installing anaerobic tanks and aerobic tanks. ) Oxidation to nitric ions (NO ₃ ⁻ ) takes place in an aerobic tank where the nitrate ions are reduced to nitrogen and oxygen in the anaerobic and anaerobic tanks. 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 to be used for aerobic tank was added to the aerobic tank / anaerobic / anoxic / aerobic tank (OA ² O) method, and if the concentration of the waste water, the anaerobic tank is connected the aerobic tank to the rear end AOA ² method / aerobic tank / anaerobic / anoxic / aerobic tank (AOA ² O) The effect of the invention that the method is the most suitable method was obtained.

Claims (4)

An anaerobic, aerobic and anaerobic tank combined wastewater treatment system characterized by consisting of aerobic tank (4) and anaerobic tank (5) in order to effectively remove ammonia nitrogen in the wastewater and low concentration of wastewater. The anaerobic, aerobic and anoxic tank sequential combined wastewater treatment apparatus according to claim 1, wherein an anaerobic tank (17) is added at the beginning of the treatment to effectively remove the ammonia nitrogen in the wastewater. The sequential combined wastewater treatment of anaerobic, aerobic and anaerobic tanks according to claim 1, characterized in that the concentration of wastewater is low and an aerobic tank (35) is added at the end of the treatment to effectively remove ammonia nitrogen and phosphate phosphorus in the wastewater. Device. The anaerobic tank according to claim 1, wherein an anaerobic tank 47 and an aerobic tank 51 are added at the front end of the treatment to effectively remove ammonia nitrogen and phosphorus phosphorus in the waste water at the same time. Sequentially combined wastewater treatment system of aerobic and anaerobic tanks.