TWI379810B - - Google Patents

Description

1379810 IX. Description of the Invention: [Technical Field] The present invention relates to a wastewater treatment device and a wastewater treatment method, and more particularly to removing biologically-containing water and biological metabolites in biological treatment water after biological treatment of treated water When a coagulant is added to the agglomerating treatment, the dissolved matter and the suspended matter are added, and the addition of the coagulation (4) and the drainage treatment method for obtaining the treated water can be reduced. [Prior Art] The biological treatment method is widely used in the treatment of organic drainage. Further, in order to remove the Z-dye material such as suspended matter and dissolved matter in the biological treatment water, or to treat the water in the case of a large amount of water, the coagulation treatment of the biological treatment water lamp is carried out, and the membrane treatment is further carried out after the coagulation treatment. In Japanese Patent No. _238152, it is disclosed that: biological treatment of 3 organic waters is carried out 'addition of coagulant to biological treatment water=treatment' for solid-liquid separation of coagulated water, and after using water to remove water, and then The limb osmosis membrane separation device performs a membrane __ Γ ^ ^ on the water. Further, in this method, the solid-liquid separation device discloses a separation device; the pressurized floating separation device of the solid-liquid separation device has an advantage that the installation area is small but sufficient. When adding the material to the agglomeration treatment, in order to promote the effect, the = (inorganic coagulant) is a factor directly related to the operating cost. However, the coagulation treatment process of biological treatment water “solvent organic matter (10)c), especially the condensation of biological metabolites 5 1379810 is difficult to handle, usually requires a large amount of coagulant. Especially in recent years, Nissin attaches great importance to the reuse of water resources, which requires =Recycling. In order to treat the discharged money for aquatic organisms, it can reach the level of "recycling purpose" so that a large amount of coagulant is required. Therefore, in the coagulation treatment of the biological treatment water, the amount of coagulant added is reduced. In addition, in order to reduce the amount of coagulant added, although the eight-aggregate auxiliary solution method is proposed, the adjuvant will increase the processing cost; Household: Currently, an easier and cheaper method is needed. SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a method for removing dissolved substances and suspended substances containing biological cells and biological metabolites in biological treatment water after biological treatment of the water to be treated. When the polycondensation agent is subjected to the coagulation treatment, the addition amount of the coagulant can be reduced and the drainage of the treated water can be obtained. According to the above-mentioned object, the inventors of the present invention have found that when the biologically treated cells and biological metabolites are coagulated, air exposure is performed by stirring in the coagulation reaction tank. The gas is then subjected to pressure-up and separation of the coagulated water, and the amount of the coagulant added can be reduced. Further, it has been found that by adjusting the water in the coagulation reaction system to an optimum pH value and using an oxidizing agent, it is possible to further increase the amount of the coagulant. The present invention is based on the above concept and includes: a drainage treatment device comprising: a biological reaction tank for biological treatment of treated water, and biological treatment for the biological reaction tank a condensed reaction tank for agglomeration reaction by adding 6 1379810 coagulant; a pressurized floating separation device for solid-liquid separation of the coagulated water discharged from the coagulation reaction tank; and an aeration device provided in the coagulation reaction tank The above-mentioned drainage treatment device further includes adjusting the water in the aggregation reaction tank to a pH of pH 3 to 6. The above-described drainage treatment device further includes an oxidant addition device that adds an oxidizing agent to the coagulation reaction tank. The above-described drainage treatment device further includes a discharge device w from the pressure-up floating device a method for treating solid-liquid separation by pressurizing the separated water, and providing a method for treating the wastewater, comprising: biological treatment of the water to be treated: a biological reaction step; biological treatment flowing out from the biological reaction step: adding condensation a coagulation reaction step of agglomerating reaction; a solid-liquid separation of the coagulated water discharged from the reaction step - a pressurization step and a enthalpy/depolymerization reaction step are carried out under aeration

In the above-described drainage treatment method, a pH adjuster is added to the water in the aggregation reaction step, and the water is adjusted to a pH of 3 to 6. A method for treating a water discharge of ???, wherein an oxidizing agent is added to the water enthalpy of the agglomeration reaction step. 8. The above-mentioned drainage treatment method H also includes the floating substance containing the cells and the biological metabolites in the liquid-to-dust separation from the dusting: (iv) flow (four) dusting and separating the separated water 7 1379810 And the treatment of suspended substances, especially biological metabolites (four) is difficult, = some methods require a large amount of coagulant. However, according to the present invention, in the case of the opposite treatment, the separation treatment from the aeration (usually the working milk) to the condensation at the time of the agglomeration treatment to the separation at the time of the pressurized floating separation is performed by the combination treatment. It can improve the cohesiveness and the solid-liquid separation property, thereby achieving the reduction of the amount of the coagulant added, and obtaining a good treated water. Although the detailed mechanism of action of the present invention as described above is not clear, the following factors may be considered: · The presence of water in the water after treatment, the dispersion of the cells present in the water, and the high molecular organic matter (for example, protein, etc.) In the combination of the θ1^ over-consideration device, it is considered to have a great influence on the quality of the over-boiled water and white matter. For example, in the foaming of the biological treatment tank, a P-knife of the protein has a substance having affinity with air. In the present invention, in the state in which the agent protein f is neutralized by the charge and coarsened, the protein which has been subjected to the coarsening becomes a state of being complexed with the bubble. As a result, when the solid-liquid separation is performed in the subsequent stage of the aggregating reaction tank by the pressurization and purification method, the separation property is further improved by the complexation of the fine bubbles. The night knife is different from the other, especially the iron coagulant. ρΗ^ is weakly acidic to the inside. The trivalent iron is effective for coagulation. For example, when using ferric iron (trivalent iron; ^=agent, there are also some proportions in the coagulant). The divalent iron. When the aeration is carried out in the condensation reaction tank, the ferrous iron is oxidized to become a ferrous iron effective for coagulation. In addition, adding an oxidant such as a sub-gas to the coagulation reaction tank will further advance. Increase. And 'most proteins have an isoelectric point in the weak acid range, so the pH is in the acidic range (for example, pH 3~6) 8 ^ 810 'The more the hydrolysis is, the higher the coagulation effect is. The mechanism of action 'With the present invention, a small amount of coagulant can be added to obtain high-quality treated water, and: (1) The reduction of the amount of coagulant added can reduce the cost of the coagulant, and further reduce the cost and pollution of the neutralizer. Mud treatment fee. One (7) can improve the pressure up-separation separation of the flocculated floc, and then reduce the space by k Γ7 force [the flow rate of the device. (.3) Reduction and dusting up and separation The water quality of the water can improve the efficiency of the latter stage treatment; that is, it is set in the rear stage; when the device is considered, the backwash frequency of the over-discharge can be reduced, and when the reverse osmosis (10) membrane separation device is installed in the back of the basin, the RO can be prevented. In addition to the above effects, the film can be effectively recovered: water is recovered and reused. [Embodiment] Hereinafter, specific embodiments of the wastewater treatment device and the wastewater treatment method of the present invention will be described in detail. [Drainage] In the present invention, the drainage to be treated is not particularly limited as long as it is a biologically treated wastewater containing organic matter. For example, there are electronic industry drainage, chemical factory drainage, and food factory drainage. In the electronic component manufacturing process, various organic drainages are generated from the development process, the peeling process, the etching process, and the cleaning process, and it is necessary to recycle the wastewater and purify it to pure water. Therefore, these drainages are suitable. Drainage of the treated article of the invention of 1379810. Such organic drainage, for example, organic sulfur compounds containing different drainage, containing monoethanolamine _, "basic, etc. (organic nitrogen of organic matter, organic nitrogen of recorded nitrogen, containing H) Organic Drainage Maple Leaf ([Biological Treatment] The biological reaction tank for biological treatment of drainage can be used as long as it has excellent decomposition efficiency of organic matter. It can be estimated to use known aerobic or anaerobic biological treatment methods. For example, a biofilm method in which the activated sludge is held in the tank in a floating state, and the activated sludge is adhered to the carrier and held therein can be used, and the biofilm method can be a fixed bed type or a flow. Any type of microbial bed, such as bed type, unfolded bed type, and the like, the carrier can be arbitrarily used as an activated carbon. Various kinds of plastic carriers, sponge carriers, etc. The floating method requires separation of activated sludge from the treated water. A solid-liquid separation device such as a sedimentation tank or a membrane separation device is disposed in the rear portion of the tank, and other methods are used because the activated sludge is retained in the biological treatment reaction tank. The solid carrier separation device is preferably a sponge carrier, and the sponge carrier can maintain a high concentration of microorganisms. The raw material of the sponge is not particularly limited, but an ester type polyurethane urethane is preferred. It is not particularly limited, but it is generally preferred that the carrier has a visual capacity of 10 to 50% with respect to the tank capacity of the biological reaction tank. Under the aerobic state, the aerobic organism 1379810 reaction tank which decomposes organic matter by microorganisms, An aeration tank for supplying oxygen (air) to the aerator, an aeration tank, and an oxygen supply device may be used. On the other hand, in an anaerobic state, an anaerobic biological reaction tank for decomposing organic matter by microorganisms, The anaerobic tank bioreactor that can hold the carrier and the granular sludge can be an aerobic biological reaction tank or an anaerobic biological reaction; a single tank of fa, or an aerobic biological reaction tank and/or anaerobic The plurality of tanks of the biological reaction tank may be provided with partition walls in the tanks of the single tanks. [Coagulation treatment] In the present invention, biological treatment of biological treatment drainage in the biological reaction tank Coagulation treatment for the occasion, while biologically treated water of the polymerization inhibitor added ^ 'by aeration stirring <. Flocculation tank > coagulation treatment with coagulation reaction vessel (hereinafter referred to as "flocculation tank ,,)

The '3' is only one groove, and may be a groove in which a plurality of stages of the plurality of grooves are provided. The coagulation treatment device is generally agitated by a low-speed agitation tank for a continuous agitation tank and a long-term coagulation flocculent for the coagulant to be sufficiently contacted with the water to be treated, === high agitation in the tank, and then at a low, It is better to use the aeration to complete the stable growth of the floc by the lion without using aeration. When the two or more than two or more grooves are used, it is preferable to set the groove of 2 to the air aeration tank, and the condensation groove of the latter stage. The mechanical imparting 379810 can fully agitate the air aeration agent of the air aeration tank. Mechanical stirring tank. There is no particular limitation, and the agglomerating agent used in the coagulation treatment may be a mixture of ferric chloride and polysulfide: coagulating (four) 'sulfuric acid, gasification, and polycondensation. Mingming coagulant such as gasification.

The aspect of 2 η fruit is better than the coagulant. These inorganic condensate may be used alone or in combination of two or more. The amount of the inorganic coagulant added depends on the characteristics of the biologically treated water and the water quality, and is usually preferably 50 to 3 mg/L. Further, in view of the characteristics of the drainage, the effect of improving the water quality and the pressure-floating separation property of the coagulated water can be further improved by using the organic coagulant and the above-mentioned auxiliary agent. In this case, the organic coagulant may be added to the front stage of the inorganic coagulation J addition step, or may be added to the subsequent stage, and also in the step of adding the inorganic coagulant. The amount of the organic coagulant to be added varies depending on the quality of the biological treatment water and the form of use of the organic coagulant, and is usually preferred. Adjustment>> In the agitation tank for aeration agitation, the pH value in the coagulation treatment is 3 to 6, and the condensed water treatment effect can be improved by setting the pH to the acid range. In particular, when an iron-based coagulant is used, it is extremely effective to mix by aeration and agitation at a pH of 5.5 or less, and when an aluminum-based coagulant is used, it is mixed by aeration stirring at a pH of 5.5 or less and then the pH is adjusted to More than 6 则 is more effective. 12 1379810 When the coagulation treatment equipment is operated by two ladders, the other agglutination tanks are based on the drainage and the suitable yang 3~6, the helmet TT, w can be shoveled to PH 3 according to the type of coagulant. ρΗ values other than ~6. J Μ 即, sulfuric acid (H2S04) ^ Suitable for pH adjustment, including acid such as hydrochloric acid (HC1) or alkali such as sodium hydroxide (NaOH). <Oxidant> In the agglomeration treatment step as described above, a better aggregation treatment result is obtained. The "emulsifier' may be used in the case of oxygen (Na(10)) or sodium persulfate, or the amount thereof may vary depending on the biological treatment water conditions, and is usually preferably WOmg/L. "Treatment [Additional Floatation Separation] n = pressurization and flotation separation of the coagulated water, and solid-liquid separation of the produced 13⁄4 1 condensate. ~ This pressurized floating separation usually uses a pressurized floating separation device. In the coagulation treatment, (4) the floating separation property of the coagulation treatment water is improved by aeration, and the water LV' at the time of pressurization and floating separation can be obtained from the normal pressurized floating separation treatment. 1〇~20 hr·! to improve the processing efficiency, and the installation space is also reduced by the miniaturization of the device. l [Filtering], preferably, the separated water obtained by the pressurized floating separation is further filtered by a filtering device. The filter device may be a packed layer filter filled with material such as sand or anthracite, or a membrane filter using a fine filtration (MF) membrane, a semipermeable membrane filtration (UF) membrane, or the like. By aeration at the time of coagulation treatment, the pressure-uple separation property is improved, and the pressurized floating water having good water quality can be obtained, thereby preventing clogging of the filter device and reducing the backwashing frequency of the filter device, and [RO membrane treatment] The filtration treatment water obtained by pressurizing the separated water or filtering the water is subjected to (10) membrane treatment by the RO membrane separation device, and the deionization treatment by the (10) membrane treatment can be performed. Obtaining high-purity water. Before the RO membrane treatment, it is preferable to remove the residual SS' of the pressurized floating separation water-: and then pressurize the floating separation water to be filtered and treated by the above-mentioned filtration device. The R上 membrane treatment can be directly applied to the pressurized floating water. The R〇 membrane separation device can use any known device. The tree can be added with a small amount of inorganic coagulant to obtain an excellent addition of the ocean separation water, and The FI value of the filtered treated water is low, and it can be supplied to the RO membrane separation device. Therefore, it is possible to suppress the decrease in the membrane flux due to the scale of the membrane separator, and to obtain the treated water in a long (four) pattern. )) 〆 FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI FI RO RO RO RO RO RO RO RO RO RO RO RO RO RO RO The approximate amount There is also a judgment that the enthalpy flux is prematurely reduced and there is no such situation as 14 1379810. At this time, the FI value of the R 〇 feed water will be different. The FI value is as follows in the water quality of the following examples. According to the evaluation, by using the sample X SlL over the ruthenium film with a regular pore size, the required time for the initial time and the time required to flow between the gauges and the time interval can be used to measure the required amount of the transitional regulation. The inter-FI value is used to judge the water quality that is likely to cause or is not likely to cause membrane fouling or membrane clogging. Generally, even if the water quality of the FI value of 5 or less allows RO water supply, it is generally preferred that the water has a FI value of 4 or less. Preferably, the biological treatment water is first subjected to a coagulation treatment and a pressure-up floating separation treatment, and then subjected to a filtration treatment to obtain a Bayesan value 4 for RO membrane treatment. TM [Other treatments], the present invention can be used in combination with the other treatments in the latter stage of the pressurized floating separation apparatus. For example, in order to remove residual dissolved organic matter, an activated carbon column may be disposed for the silky rhyme adsorption treatment.

For the membrane, the activated carbon tower is placed in the rear section of the transition device, and (10) the membrane knife is off the front section of the farm. [Processing Apparatus] The following is a schematic diagram of the present invention with reference to the accompanying drawings: The drainage treatment apparatus of the present invention shows that the wastewater treatment apparatus of the present invention is an embodiment of the present invention, and FIG. 1 is a biological reaction tank; 2, each; 3 is the addition of floating separation tank, · 4 is, % is - the condensation groove separation shock; 6 is an activated carbon tower. ~ Device; 5 is - (10) Membrane The water treatment device of the first figure is after the biological treatment in the biological reaction tank, in the first aggregation tank 2 A provided with an aeration device, adding no, suspect For example, an iron coagulant), an oxidizing agent, and an acid are subjected to agglomeration treatment under high-speed stirring of pH 6 and then introduced into a first flocculation tank 2B provided with a sandalwood mixer, and then an organic coagulant and a base are added at pH 5 ～8 3 conditions under the speed (four) money line coagulation treatment, the money is separated by pressure, and the medium added C floats and separates the coagulated water, and the separated water is filtered through a filtering device to obtain a filtered water as treated water. The apparatus shown in the second figure is a filter-processed water in which the core RQ membrane separation apparatus 5' performs the same operation as the apparatus of the first diagram in the rear stage of the filter apparatus 4 of the first diagram, and the R membrane separation apparatus is reused. 5 Deionization treatment is performed to obtain a treated water. The device of the eighth diagram is the filter device 4 and the R diaphragm of the second diagram device t

4 is not placed between the 5 - activated carbon column 6; and in the first flocculation tank 2A added inorganic coagulant (such as a coagulant) and oxidant and acid: base 'in the second flocculation tank 2B, only add acid or Alkali. The same as the first figure, the 2 polymerization treatment and the pressure floating separation treatment, and the _treated water is removed by / ^ 6 to remove the residual dissolved organic matter, and then the R0 membrane is separated by 4 rows of deionization treatment to obtain a treatment. water. The device shown in the first figure is only set to solid in the coagulation tank in the second diagram device, 'adding inorganic coagulation f and oxidant and acid or 'in the pH value' in the coagulation tank 2 provided with the aeration device After performing the 'polymerization treatment' under the condition of weak acidity, the pressure-up floating separation tank 3 is subjected to pressure-up floating separation treatment, and then subjected to filtration treatment and (10) membrane separation treatment to obtain - treatment water 16 1379810. The device is provided with a slot for the collection groove in the first figure device. Adding an organic coagulant and an acid or a test in a first coagulation tank treated with a mechanical agitation device, and agglomerating at a pH of 5 to 7; then in the second coagulation tank 2B, exposing the inorganic coacervate The agent and the oxidizing agent and the acid or the alkali are subjected to a coagulation treatment in J, and then to the third coagulation tank 2. In the middle, borrowing p from the machine = piece into the ^ ^ Ji Tian mechanical stirring to add acid, test 'under the conditions of PH6 ~ 8 agglomeration treatment, condensation treatment of the straw by pressurized floating separation treatment, filtration treatment to obtain a treatment water. In addition, the apparatus shown in the first to fifth figures is a plurality of preferred embodiments of the drainage treatment of the present invention; however, the present invention is not limited to any of the illustrated two, in the above-described processing apparatus of the collecting groove or the rear stage. , also / form of device. Other examples will be described more specifically by way of examples and comparative examples. Example 1 to 4 x where the apparatus is used. (4) Apparatus 'The water quality of the organic drainage water for organic drainage according to the present invention, the biological reaction tank used (4) is as follows, and is taken at 2400 L/day. Pressurize the separated water of the floating separation tank, ... (4) The filtration time used for the enthalpy under the pressure of over ==, the FI value calculated by the shoulder pattern as follows, and the continuous over-feeding of the filter device (filter device to blockage) It is necessary to rush 'with π Μ W W filter time (water quality evaluation of water, the results are shown in Table 1. 17 1379810 As mentioned above, the flow standard of the RO membrane separation device is a value of 4, preferably to obtain the FI value 4 or less treated water., FI={(1—T〇/T15 ) / Τ15} ι〇〇Τ〇. Initial filtration, time required for 500cc (sec) T15: Continuous filtration for 15min, filter 5〇〇 Time of τ

[Water quality of organic drainage] BOD : 1000mg/L

[Bioreactor] Tank capacity: 2400L Aeration: 200L/min Add to the tank capacity with visual capacity Carrier: 50% of the 3mm square sponge

[First flocculation tank] Tank capacity: 50L Inorganic coagulant: Adding 200 mg/L (FeC13 equivalent amount) % of the amount of ferric chloride aqueous solution Heavy oxidizing agent: Adding sodium hypochlorite (NaCi〇) in the amount shown in Table 丨) pH in the tank: as shown in Table} (adjusted by adding Ηα or Naci) Air aeration: 20L/min [Second condensate tank]

Tank capacity: 50L organic coagulant: Add 0.5mg/L polyacrylamide partial hydrolyzate in the tank PH. As shown in Table 1 (adjusted by adding HC1 or NaOH) 18 1379810 Good: Mixing machine: flat feather 40mmx200mm, 60rpm Leaf mixing [pressurized floating separation tank] Tank: cylindrical floating separation tank with a diameter of 130 mm Pressurized water ratio: 30% flowing water LV ·· 10m/hr [Filter unit] Filtration method: Gravity double-layer filtration LV: 5.6 m/hr Comparative Example 1 In Example 1, except that the stirring device of the first aggregating tank was set to be the same as the second aggregating tank, the stirring treatment was not the same as the air aeration, and the other treatments were the same. The processing results are shown in Table 1. Comparative Example 2 In Comparative Example 1, except that the amount of the inorganic coagulant added to the first aggregation groove was increased to the amount shown in Table 1, the other treatments were the same. The processing results are shown in Table 1. Table 1 Example Comparative Example 1 2 3 4 1 2 Addition amount of inorganic coagulant (FeCl3) (mg/L) 200 200 200 200 200 450 Coagulation oxidant (NaCIO) Addition amount (mg/L) 10 10 10 — 10 10 PH 5.5 3.0 7 5.5 5.5 5.5 4曰 Stirring mode Air aeration mechanical stirring Second agglomeration tank pH 5.5 7 5.5 5.5 5.5 5.5 Treatment water FI 2.0 2.1 3.0 3.3 5.6 3.8 Continuous filtration time (hr) 24 24 24 24 17 10 19 1379810 From Table 1, the following results can be clearly obtained: That is, in the comparative example in which the first agglomeration tank is mechanically stirred, the FI value of the treated water is high, the water quality of the treated water is bad, and the continuous filtration time is also higher than that of the embodiment 1~ 4 short. In Comparative Example 2 in which the amount of the inorganic coagulant added was increased, the FI value was improved but not sufficient, and the formation of the flocculated floc was not sufficient in both the floc and the affinity of the bubble, so the pressure was raised. The separation is low, and the continuous filtration time is very short.

Therefore, the embodiment in which the air aeration in the first-stage flocculation tank can be carried out is excellent in the case of the example 3; especially in the state of adding the oxidant (the actual ^ 1 or the pH of the first flocculation tank is adjusted to be acidic) The state (actual examples 1, 2) can also obtain good results. Example 5 In Example 1, except for the marriage _ 哲 ^ ( ^ - , 士 first minus # slot added 250mg / L b (to chaos The illusion is used as an inorganic coagulant, and the pH of the first sputum is adjusted to the groove and the

The processing results are shown in Table 2. ,, other processing is the same. Comparative Example 3 In Example 5, except that the first air was aerated, the same as the stirring device of the second agglomerating tank was not provided. The processing results are as shown in the table, household; = blade (four), other 20 1379810 Table 2

According to Table 2, the effect of using air aeration as in the present invention can also be obtained by using PAC as an inorganic coagulant. Further, comparing Example 5 with Comparative Example 3, it was found that the FI value of Example 5 was longer than that of Comparative Example 3, and the filtration time was longer than that of Comparative Example 3. BRIEF DESCRIPTION OF THE DRAWINGS A diagram of an embodiment of a drainage treatment apparatus of the present invention is shown. The present invention is a drainage system for the present invention. The third embodiment of the present invention is a system for the drainage treatment of the present invention. The other fifth figure is the main component symbol description of the wastewater treatment device of the present invention. 1 Biological reaction tank 2 Coagulation tank 21 1379810 2A First flocculation tank 2B Second flocculation tank 2C Third flocculation tank 3 Pressurized floating separation tank 4 Filter device 5 RO membrane separation device 6 activated carbon tower

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Claims (1)

1〇丨月丨斗日 Revision this ~Supplement, Amendment, Baiman, June 14, 2004 1379810 I Announcement 10, Patent Application Range: 1. A drainage treatment device, including: Biological treatment of treated water a biological reaction tank; a coagulation reaction tank for adding a coagulant to the biological treatment water flowing out of the bioreactor; and adjusting the water in the coagulation reaction tank to a pH adjuster adding device having a pH of 3 to 6; A pressurized floating separation device for solid-liquid separation of the agglomerated treated water flowing out of the condensation reaction tank; and an aeration device provided in the aggregation reaction tank. 2. The wastewater treatment device of claim 1, further comprising an oxidant addition device for adding an oxidizing agent to the coagulation reaction tank. 3. The wastewater treatment apparatus according to claim 1 or 2, further comprising a filtration device for solid-liquid separation of the pressurized floating separation water flowing out of the pressurized floating separation device. The wastewater treatment apparatus according to claim 1 or 2, wherein the agglomeration reaction tank comprises a first agglomeration reaction tank aeration induction tank and a second agglomeration reaction tank mechanical agitation tank. 5. The drainage treatment device according to claim 1 or 2, wherein the agglomeration reaction tank comprises a first agglomeration reaction tank, a second condensation reaction tank and a third condensation reaction tank, wherein the second condensation reaction tank is exposed The gas sensing tank, the first and third agglomeration reaction tanks are mechanical stirring tanks. 6. A method of wastewater treatment comprising the steps of: a biological reaction step for biological treatment of treated water; 23 1379810 Supplementary, revised flood period • Biological treatment water flowing out of the biological reaction step on June 14, 101 a coagulation reaction step of adding a coagulant to the coagulation reaction, wherein a pH adjuster is added to the water in the coagulation reaction step, and the water is adjusted to pH 3 to 6; the coagulated water discharged from the coagulation reaction step is subjected to solid-liquid separation a pressurized floating separation step; and the agglomeration reaction step is a coagulation reaction under aeration. 7. The wastewater treatment method according to claim 6, wherein the oxidizing agent is added to the water in the coagulation reaction step. The wastewater treatment method according to claim 6 or 7, further comprising a filtration step of subjecting the pressurized floating separation water flowing out of the pressurized floating separation step to solid-liquid separation. 9. The wastewater treatment method according to claim 6 or 7, wherein the agglomeration reaction step is carried out in the first and second agglomeration reaction tanks, wherein the first agglomeration reaction tank is subjected to agglomeration reaction under aeration The second agglomeration reaction tank is subjected to a coagulation reaction under mechanical stirring. The method of draining treatment according to claim 6 or 7, wherein the agglomeration reaction step is carried out in the first, second and third coagulation reaction tanks, wherein the second coagulation reaction tank is in aeration The coagulation reaction is carried out, and the first and third coagulation reaction tanks are subjected to a coagulation reaction under mechanical stirring. twenty four