201235094 六、發明說明： 【發明所屬之技術領域】 本發明係關於流體化床式生物處理裝置等之攪拌槽， 特別關於具備複數個攪拌機之攪拌槽。 【先前技術】 在生物處理中，使微生物附著於載體，高度維持槽內 的MLVSS之流體化床式生物處理裝置係被廣泛使用。此 流體化床式生物處理裝置中，一般情形下，槽內所塡充之 載體係以攪拌葉片所形成的攪拌及上流的水力而流動》 爲了藉由理想混合載體與液體而有效率地進展生物反 應，攪拌對於流體化床式生物處理裝置係一重要因素。一 般而言，攪拌的強度係爲G値而說明如下所示數値。 G 値=/"{(CDxAxv3)/(2xyxV)}[-]·.. ( 1)201235094 6. DISCLOSURE OF THE INVENTION [Technical Field] The present invention relates to a stirring tank for a fluidized bed type biological treatment device, and more particularly to a stirring tank having a plurality of agitators. [Prior Art] In biological treatment, a fluidized bed type biological treatment apparatus that adheres microorganisms to a carrier and highly maintains MLVSS in the tank is widely used. In the fluidized bed type biological treatment device, in general, the carrier which is filled in the tank flows with the agitation and the upward flow of water formed by the stirring blade. In order to efficiently progress the organism by ideally mixing the carrier and the liquid. Reaction, agitation is an important factor in fluidized bed bioprocessing units. In general, the strength of the stirring is G 値 and the number shown below is shown. G 値=/"{(CDxAxv3)/(2xyxV)}[-]·.. ( 1)
CD :葉片的阻力係數 A:葉片的全面積〔m2〕 v:葉片與水的相對速度〔m/sec〕 γ μ / P μ ··水的黏度〔kg/m . sec〕 p :水的比重〔kg/m3〕 V :槽容積〔m3〕 如同（1)之公式，當攪拌翼的面積越大，或攪拌翼 的直徑越大，G値就越大。又，得到特定的G値之情形時 ，爲了攪拌翼形狀越大而抑制旋轉次數，動力就變越低。 201235094 然而，爲了攪拌翼形狀變得越大而作爲構造體的強度 要求越強，不只攪拌翼重量增加、成本也增加。由於增加 重量，搬運及安裝也變得困難，維修保養亦不容易。 專利文獻1 (日本專利特開20 1 0-467號公報）中記 載一種厭氧槽或無氧槽，將攪拌機軸形成垂直方向之2台 螺旋槳式攪拌機配置於槽內。此專利文獻1之0015段落 記載：若使2台攪拌機同時旋轉，在各攪拌機產生以螺旋 槳翼爲中心之上下方向的渦流，攪拌機之間發生水流衝擊 而堆積污泥。 專利文獻1之0016段落記載：爲了防止如此的污泥 堆積，將各攪拌機每隔特定時間交互運轉。再者，專利文 獻1中並沒有關於各攪拌機的旋轉方向之記載。 專利文獻2 (日本專利特開平1 1 - 1 04682號公報）之 0 02 1段落以及圖1、2中，記載於圓形的槽內設置將攪拌 機軸形成垂直方向之2台攪拌機之厭氧性排水處理裝置， 其構成係各攪拌機不僅以各自的機軸旋轉而自轉，還以槽 爲中心作爲公轉中心進行公轉。在專利文獻2之〇 〇 2 1段 落則記載全部的旋轉方向乃相同。 專利文獻3 (日本專利實公昭63 -5 773號公報）中記 載將反應槽內分隔成上流側、下流側之2個容室，使各容 室的下部之間連通’各容室內設置攪拌機，在上流側的容 室內係根據攪拌機形成上升水流，在下流側的容室內則根 據攪拌機形成下降水流。 如上述專利文獻1，並列設置2台攪拌機時，攪拌機 -6- 201235094 之間會有攪拌變弱之情形。 如上述專利文獻2，2台攪拌機不僅自轉也使其進行 公轉時，裝置構成複雜、成本變高。又，槽的形狀也侷限 於圓形。 專利文獻3基本上是在各容室內設置1台攪拌機，容 室大小有限制。 [專利文獻1]日本專利特開2010-467號公報 [專利文獻2]日本專利特開平1 1 - 104682號公報 [專利文獻3]日本專利實公昭63 -5773號公報 【發明內容】 . 本發明之目的在於提供一種攪拌槽，於槽內設置複數 個攪拌機，其中係根據簡單構造即可充分攪拌槽內的廣闊 範圍" 本發明（第1項）之攪拌槽係複數設置具備攪拌翼及 上下方向的驅動軸之攪拌機，其中至少一部份的相鄰接之 攪拌機之旋轉方向設定成相反的方向，同時於該相鄰接之 攪拌機之間，配置往上下方向且與連接雙方的攪拌機之方 向爲槪略垂直方向延伸之板狀體。 本發明之第2項之攪拌槽係於第1項中，該板狀體的 下端抵接或接近槽的底部，該板狀體的上端則位於該槽的 水準附近或其上方位置，該板狀體的側端離開該槽的壁面 201235094 本發明之第3項之攪拌槽係於第2項中，該板狀體的 水準方向的寬度，係與連接該雙方的攪拌機之方向爲槪略 垂直方向的槽壁間長度之50%〜90%。 本發明之第4項之攪拌槽係於第1〜3項之任一項中 ，該槽係往水準方向的一方向之長形的非圓形槽，於該槽 的長邊方向之一端側設置流入部，於另一端側設置流出部 ，於該槽的長邊方向間隔設置該攪拌機，相鄰接的攪拌機 之旋轉方向爲相反的方向，相鄰接的攪拌機之間設置該板 狀體。 本發明之第5項之攪拌槽係於第4項中，下流側所配 置之攪拌機的G値比上流側之攪拌機的G値大。 [發明效果] 本發明之攪拌槽係於相鄰接、旋轉方向爲相反的方向 之攪拌機之間配置板狀體。平面視圖中，使一方的攪拌機 的旋轉往順時針方向旋轉、另一方的攪拌機往逆時針方向 旋轉時，於該一方的攪拌機周圍產生順時針方向的旋轉水 流，另一方的攪拌機周圍產生逆時針方向的旋轉水流。因 爲該等的攪拌機之間配置板狀體，故旋轉水流之間沒有相 互衝突，又旋轉水流的方向一致，故能防止相互的旋轉水 流的水力被削減。藉此，槽內的水有效率地被攪拌。本發 明之攪拌槽係適合作爲流體化床式生物處理裝置使用，但 並不限於此。 201235094 【實施方式】 以下，參照圖式對實施型態進行說明。圖1、圖2係 實施形態之擅泮槽之平面圖及剖面圖。 此攪拌槽係流體化床式生物處理裝置1，具有槽5、 該槽5內所設置之攪拌機2、3、以及板狀體4。槽5係長 度往一方向延伸的非圓形槽，從長邊方向的一端側流入原 水，從另一端側流出處理過的水。槽5內容置有載體6。 攪拌機2、3係將驅動軸2a、3a設定成垂直方向之縱 形攪拌機。於該驅動軸2a、3a設置攪拌翼2b、3b。攪拌 機2係配置於槽5的長邊方向的流入側，攪拌機3則配置 於流出側。攪拌機2、3的驅動軸2a、3a的旋轉方向係互 爲相反的方向。 攪拌機2、3的攪拌翼2b、3b在此實施型態中係將板 面設定成垂直方向的平板狀，並從驅動軸2a、3a往放射 方向延伸。此實施型態中，攪拌翼2b、3b係於180°相反 方向設置2片。然而，翼往放射方向設置3片以上亦可， 一般以2〜4片程度爲理想。又’翼的形狀並不限定於平 板狀。 攪拌翼2b、3b的旋轉直徑（2. r)係槽5的短邊寬 度的20〜80%、特別以50〜70%程度爲理想。再者，圖 2的r表示攪拌翼2b的旋轉半徑。 攪拌翼2b、3b係配置於槽5的水深方向的中間附近 。再者，攪拌翼2b、3b在此實施型態係於上下方向僅設 置1段，但也可以設置2段以上。 -9 - 201235094 攪拌機2、3之間的板狀體4，係往槽5的短邊 方向延伸。在此實施型態，板狀體4在平面視圖中係 連結攪拌機2、3的驅動軸2a、3a的方向呈直交之方 90°方向）延伸，但較90°有少許偏差亦可’若爲90 、特別是90°±5°的範圍爲佳。 板狀體4的下端係接觸槽5的底面，但也可與槽 底面之間留有少許（例如水深的20%以內、特別是 以內的程度）空隙。而板狀體4的上端，係位於槽5 面的上方，但也可以是與水面相同水準，或也可以比 低少許（例如水深的2 0 %以內、特別是1 0 %以內的 )，沒於水中。 板狀體4的側端係任一皆離開槽5的壁面。藉此 構成流入水通過板狀體4的兩側與槽5的壁面之間而 出側流動。板狀體4的寬度係槽壁與槽壁的間隔長度 實施型態中爲槽5的短邊寬度方向的槽壁之間長度 50〜90%、特別以60〜80%程度爲理想。板狀體4 度於上下方向相同爲理想，但亦可在上述範圍內作變 .板狀體4的厚度係具有可耐水流的衝擊之強度即 例如30cm以下、特別是20cm以下程度，但不限定 〇 板狀體4的材料係混凝土、金屬、合成樹脂等之 者皆可。槽5爲混凝土製之情形時，以板狀體4與槽 體構築者爲理想。 於槽5內所容置之粒狀載體6上係附著微生物。 寬度 往與 向（ 。土 1 0。 5的 10% 的水 水面 程度 ，其 朝流 (此 )的 的寬 化。 可， 於此 任一 5 — 載體 -10- 201235094 不論爲何種材質皆可，但以高耐磨耗的高分子交聯體的粒 狀爲理想。 載體的材料樹脂，係可列舉例如聚烯烴、PVA、PEG 、（聚）丙烯醯胺、N取代丙烯醯胺、（聚/甲基）丙烯 酸或其鹼金屬鹽、海藻酸、聚烯化氧、（甲基）丙烯酸二 甲胺乙酯（DAM )、二丙酮醇（DAA )、聚烯化氧等。更 具體而言，可列舉有聚丙烯酸鈉、丙烯酸鈉與丙烯醯胺的 共聚物、丙烯酸鈉與丙烯醯胺-2-甲基丙磺酸鈉的共聚物 、丙烯酸鈉與丙烯醯胺與丙烯醯胺-2-甲基丙磺酸鈉的共 聚物、以及（甲基）丙烯酸二甲胺乙酯的三級鹽或者四級 鹽的均聚物或與丙烯醯胺等的共聚物等。 載體的平均粒徑可使用 1mm〜20mm，以 1mm〜5mm 爲理想，特別以1.2 mm〜3.5 mm爲更理想。若比以上範圍 小，則載體與水的分離變得困難，若比以上範圍大則會造 成流動的妨礙。 載體的空隙率以20〜50%爲理想’特別以30〜40% 爲理想。若空隙率低，則污泥的附著變少，處理效率變低 ，若空隙率高，則容易包含入氣體。 載體的密度係平均以0.96〜1.02 g/cm3爲理想，而80 %以上的載體的密度爲0.98〜1.01 g/cm3、特別以0.98 5〜 1.00g/cm3 爲理想。 載體的充塡量，以相對槽5的水面位WL以下的容積 ，載體的容積爲5〜50%的量爲佳。相較於此，載體的量 少則處理效率變低，比50%多則攪拌動力變得過大。 -11 - 201235094 關於如此所構成之圖1、圖2之流體化床式生物處理 裝置（攪拌槽）1，係使攪拌機2順時針旋轉，並使攪拌 機3逆時針旋轉。再者，也可以使攪拌機2逆時針旋轉， 而使攪拌機3順時針旋轉。於攪拌機2、3的周圍產生相 互反方向之旋轉水流。於該等攪拌機2、3之間配置板狀 體4，故在攪拌機2、3之間的中間附近，沒有旋轉水流 之間的相互衝突。又，在攪拌機2、3之間的區域，各旋 轉水流的方向一致，故可防止相互的旋轉水流的水力削減 。藉此，載體6在槽5內的寬闊範圍有效率地被攪拌，而 提高排水處理效率。 藉由將板狀體4的寬度，設定成與連接雙方的攪拌機 之方向爲槪略垂直方向的槽壁間長度之50%〜90%，可 更加充分達成上述效果。 再者，如同圖1、圖2，從槽5的長邊方向之一端側 向另一端側流動水之情形時，載體6容易集中於槽5內的 下流側。因此，理想的是，將下流側的攪拌機的G値， 設定比上流側的攪拌機的G値大。例如，將相鄰接的下 流側的攪拌機的G値，設定爲上流側的攪拌機的G値之 1.02〜1.5倍程度，特別以1.05〜1 .2倍程度爲理想。 上述實施型態中，雖設置2台攪拌機2、3，但如圖7 所示，也可以從上流側朝下流側設置3台以上的攪拌機， 使相鄰接的攪拌機的旋轉方向爲相反方向，也可於各攪拌 機之間配設板狀體4。圖7係將3台攪拌機7、8、9配置 於一直線上的流體化床式生物處理裝置（攪拌槽）1C之 -12- 201235094 平面圖。此情形時，使攪拌機7、9與攪拌機8往相反方 向旋轉。 本發明中’也可以不將各攪拌機排列於一直線上，而 是如圖8所示，以包圍槽的中心般環狀排列。此情形時， 攪拌機係使於環的圓周方向上相鄰接的攪拌機之旋轉方向 相反’而各攪拌機之間設置板狀體。 圖8係將4台攪拌機10、11、12、13配置於對角線 上位置的流體化床式生物處理裝置1D之平面圖。此情形 時’使攪拌機10、12與攪拌機11、13往相反方向旋轉。 板狀體的寬度設定爲從槽的中心至槽壁之長度的50〜90 %。 [實施例] 以下，對實施例及比較例進行說明。 [實施例1] 如同圖1、圖2所示，使用平面視圖形狀爲往一方向 呈長八角形、於長邊方向長度爲1.5m、短邊方向長度爲 0.75m、水深1.2m、槽容量1.2m3之槽5內配置2台攪拌 機2、3之攪拌槽（流體化床式生物處理裝置），以1kg-N/m3/d的槽負荷供給N〇3-N濃度80mg/L、Ρ04-Ρ濃度 2mg/L的合成排水而進行處理。再者，以N的3倍量添加 甲醇。載體係將密度1.01 g/cm3的聚烯烴系載體（平均粒 徑3mm)塡充槽體容積的I5%。板狀體4係高1.5m、寬 -13- 201235094 0_45m、厚 10mm。 攪拌機2、3係攪拌翼半徑長度爲〇.2m (直徑長度 0.4 m)、上下寬度爲0.3 m之平翼。以攪拌機2、3的G 値爲1 2 0〜1 7 0 ( 2 9〜3 7rpm。根據載體的流動狀態作調整 。）運轉時，處理過的水的Ν03-Ν濃度爲5mg/L以下。 用水中照相機確認槽5的底部的狀況，幾乎不會發現載體 的堆積。 [比較例1 ] 於省略板狀體4、同時只於中央設置1台攪拌機2之 圖3、圖4所示之流體化床式生物處理裝置（攪拌槽）1A ，其餘與實施例相同而處理原水。又，圖3、圖4之攪拌 槽、攪拌機之構造，除省略板狀體外，其餘與圖1、圖2 相同。G値爲120〜170(38〜4 7rpm。根據載體的流動狀 態作調整。）運轉後，處理過的水的 no3-n濃度爲 14mg/L。藉由水中照相機的觀察，可發現於槽的底部，特 別是在離攪拌機遠的排水的流入側與流出側，載體大量堆 積0 [比較例2] 如同圖5、圖6所示，使用省略板狀體4外其餘與實 施例1相同構造之流體化床式生物處理裝置（攪拌槽）1B ，以與實施例1相同條件處理原水後，處理過的水的 Ν03-Ν濃度爲9mg/L。藉由水中照相機的觀察，可發現從 -14- 201235094 攪拌機2與攪拌機3的中間部份到槽5的長邊方向的壁面 附近’載體有部分堆積。 如同由此實施例1以及比較例1、2可明確得知者’ 根據實施例1，可提高載體的流動性，同時相較於比較例 i、2，其處理過的水質變得良好。 【圖式簡單說明】 圖1係本發明實施形態之攪拌槽之平面圖。 圖2係圖1之Π - Π線剖面圖。 圖3係比較例之攪拌槽之平面圖。 圖4係圖3之IV - IV線剖面圖。 匱I 5係比較例之攪拌槽之平面圖。 圖6係圖5之VI - VI線剖面圖。 圖7係其他實施形態之攪拌槽之平面圖。 圖8係其他實施形態之攪拌槽之平面圖。 【主要元件符號說明】 h ΙΑ、1B、1C、1D:流體化床式生物處理裝置（攪 拌槽） 2、3、7、8、9、10、11、12、13:攪拌機 4 :板狀體 5 :槽 6 :載體 -15-CD: resistance coefficient of the blade A: total area of the blade [m2] v: relative velocity of the blade and water [m/sec] γ μ / P μ · viscosity of water [kg/m . sec] p : specific gravity of water [kg/m3] V : tank volume [m3] As in the formula (1), the larger the area of the agitating wing, or the larger the diameter of the agitating wing, the larger the G値. Further, when a specific G値 is obtained, the power is reduced as the number of rotations is suppressed to increase the number of rotations. 201235094 However, in order to increase the shape of the agitating wing, the strength requirement as a structure is stronger, and not only the weight of the agitating blade is increased, but also the cost is increased. Due to the increased weight, handling and installation become difficult, and maintenance is not easy. In the anaerobic tank or the anaerobic tank, an anaerobic tank or an anaerobic tank is placed in the patent document 1 (Japanese Patent Laid-Open Publication No. Hei. No. 20-60-467), and two propeller mixers in which the mixer shaft is formed in the vertical direction are disposed in the tank. In paragraph 0015 of Patent Document 1, it is described that when two agitators are simultaneously rotated, eddy currents in the up-down direction around the propeller blades are generated in each of the agitators, and a flow of water is generated between the agitators to accumulate sludge. Paragraph No. 0016 of Patent Document 1 discloses that in order to prevent such sludge accumulation, each mixer is operated alternately at specific times. Further, Patent Document 1 does not describe the direction of rotation of each mixer. In the paragraph 0 02 1 of the patent document 2 (Japanese Patent Laid-Open Publication No. Hei No. Hei. No. Hei. No. Hei. No. Hei. In the drainage treatment device, each of the mixers rotates not only by the rotation of the respective axes, but also as a revolution center centering on the grooves. In the case of 专利 〇 2 1 of Patent Document 2, it is described that all the directions of rotation are the same. In the case of the reaction vessel, it is described that the inside of the reaction vessel is partitioned into two chambers on the upstream side and the downstream side, and the lower portions of the chambers are connected to each other. In the chamber on the upstream side, a rising water flow is formed according to the agitator, and in the chamber on the downstream side, a downward flow is formed according to the agitator. When the two mixers are arranged in parallel as in the above Patent Document 1, the stirring may be weakened between the mixers -6 and 201235094. According to the above Patent Document 2, when the two mixers are not only rotated but also rotated, the apparatus configuration is complicated and the cost is high. Also, the shape of the groove is limited to a circle. Patent Document 3 basically has one mixer installed in each chamber, and the size of the chamber is limited. [Patent Document 1] Japanese Laid-Open Patent Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. The purpose of the invention is to provide a stirring tank in which a plurality of mixers are arranged, wherein a wide range of tanks can be sufficiently stirred according to a simple structure. The stirring tank of the present invention (the first item) is provided with agitating blades and upper and lower sides. a direction drive shaft mixer, wherein at least a portion of the adjacent mixers are set in opposite directions, and between the adjacent mixers, the direction of the mixers in the up and down direction and the connecting sides It is a plate-like body that extends in a vertical direction. According to a second aspect of the present invention, in the first aspect, the lower end of the plate-shaped body abuts or approaches the bottom of the groove, and the upper end of the plate-shaped body is located near or above the level of the groove, the plate The side end of the body is separated from the wall surface of the groove 201235094. The stirring tank of the third aspect of the present invention is in the second item, and the width of the plate body in the horizontal direction is slightly perpendicular to the direction of the mixer connecting the two sides. 50% to 90% of the length between the groove walls in the direction. The agitation tank according to the fourth aspect of the present invention, wherein the groove is an elongated non-circular groove in one direction in the horizontal direction, on one side of the longitudinal direction of the groove The inflow portion is provided, and the outflow portion is provided on the other end side, and the agitator is disposed at intervals in the longitudinal direction of the groove, and the direction of rotation of the adjacent mixers is opposite, and the plate-like body is disposed between the adjacent mixers. The stirring tank according to the fifth aspect of the present invention is the fourth item, and the G 搅拌 of the mixer disposed on the downstream side is larger than the G 搅拌 of the mixer on the upstream side. [Effect of the Invention] The agitation tank of the present invention is provided with a plate-like body between the agitators which are adjacent to each other and whose directions of rotation are opposite. In the plan view, when the rotation of one of the mixers is rotated clockwise and the other mixer is rotated counterclockwise, a clockwise swirling water flow is generated around the one mixer, and a counterclockwise direction is generated around the other mixer. The rotating water flow. Since the plate-shaped bodies are disposed between the agitators, there is no mutual conflict between the swirling water flows, and the directions of the swirling water flows are uniform, so that the hydraulic power of the mutually rotating water flow can be prevented from being reduced. Thereby, the water in the tank is efficiently stirred. The agitation tank of the present invention is suitable for use as a fluidized bed type biological treatment apparatus, but is not limited thereto. 201235094 [Embodiment] Hereinafter, an embodiment will be described with reference to the drawings. Fig. 1 and Fig. 2 are plan views and cross-sectional views of the stencil of the embodiment. This agitation tank fluidized bed type biological treatment apparatus 1 has a tank 5, agitators 2, 3 provided in the tank 5, and a plate-like body 4. The groove 5 is a non-circular groove extending in one direction, flows into the raw water from one end side in the longitudinal direction, and flows out the treated water from the other end side. The carrier 5 is placed in the slot 5. The mixers 2, 3 are vertical mixers in which the drive shafts 2a, 3a are set in the vertical direction. The agitating blades 2b and 3b are provided on the drive shafts 2a and 3a. The agitator 2 is disposed on the inflow side in the longitudinal direction of the tank 5, and the agitator 3 is disposed on the outflow side. The directions of rotation of the drive shafts 2a, 3a of the mixers 2, 3 are opposite to each other. In the embodiment, the agitating blades 2b and 3b of the agitators 2 and 3 set the plate surface in a vertical plate shape and extend in the radial direction from the drive shafts 2a and 3a. In this embodiment, the agitating blades 2b, 3b are provided in two opposite directions of 180°. However, it is also possible to provide three or more wings in the radial direction, and it is generally preferably 2 to 4 pieces. Further, the shape of the wing is not limited to a flat plate shape. The rotation diameters of the stirring blades 2b and 3b (2.r) are preferably 20 to 80% of the short side width of the groove 5, and particularly preferably about 50 to 70%. Further, r in Fig. 2 indicates the radius of rotation of the stirring blade 2b. The stirring blades 2b and 3b are disposed in the vicinity of the middle of the water depth direction of the groove 5. Further, the stirring blades 2b and 3b are provided in this embodiment only in one step in the vertical direction, but may be provided in two or more stages. -9 - 201235094 The plate-like body 4 between the mixers 2 and 3 extends in the short side direction of the groove 5. In this embodiment, the plate-like body 4 extends in a 90° direction in which the directions of the drive shafts 2a and 3a of the mixers 2 and 3 are connected in a plan view, but may be slightly offset from 90°. 90, especially in the range of 90 ° ± 5 ° is preferred. The lower end of the plate-like body 4 is in contact with the bottom surface of the groove 5, but a small amount (e.g., within 20% of the water depth, particularly to the inside) may be left between the bottom surface of the groove. The upper end of the plate-like body 4 is located above the surface of the groove 5, but may be at the same level as the water surface, or may be lower than a little (for example, within 20% of the water depth, especially within 10%), In the water. The side ends of the plate-like body 4 are all separated from the wall surface of the groove 5. Thereby, the inflowing water flows between the both sides of the plate-like body 4 and the wall surface of the groove 5, and flows out. The width of the plate-like body 4 is the length of the space between the groove wall and the groove wall. In the embodiment, the length between the groove walls in the width direction of the groove 5 is preferably 50 to 90%, particularly preferably 60 to 80%. The plate-like body is preferably 4 degrees in the vertical direction, but may be changed within the above range. The thickness of the plate-like body 4 has an impact resistance against water flow, that is, for example, 30 cm or less, particularly 20 cm or less, but not The material defining the slab-shaped body 4 may be concrete, metal, synthetic resin or the like. When the groove 5 is made of concrete, it is preferable that the plate body 4 and the groove body are constructed. Microorganisms are attached to the granular carrier 6 accommodated in the tank 5. The width is toward and to the direction of the soil. The extent of the water surface is 10%. The width of the flow is (this). Yes, any of these 5 - Carrier-10-201235094 No matter what the material is, However, it is preferable to use a granular material having a high abrasion resistance of the polymer crosslinked body. Examples of the material resin of the carrier include polyolefin, PVA, PEG, (poly)acrylamide, N-substituted acrylamide, (poly/ Methyl)acrylic acid or an alkali metal salt thereof, alginic acid, polyalkylene oxide, dimethylaminoethyl (meth)acrylate (DAM), diacetone alcohol (DAA), polyalkylene oxide, etc. More specifically, Examples thereof include sodium polyacrylate, a copolymer of sodium acrylate and acrylamide, a copolymer of sodium acrylate and sodium acrylamide-2-methylpropane sulfonate, sodium acrylate and acrylamide and acrylamide-2-methyl a copolymer of sodium propyl sulfonate, a homopolymer of a tertiary or quaternary salt of dimethylaminoethyl (meth) acrylate or a copolymer with acrylamide or the like. The average particle size of the carrier can be used. 1mm~20mm, ideally 1mm~5mm, especially 1.2mm~3.5mm. More than When the circumference is small, the separation of the carrier and the water becomes difficult. If it is larger than the above range, the flow is hindered. The porosity of the carrier is preferably 20 to 50%, particularly preferably 30 to 40%. If the void ratio is low. In addition, the adhesion of the sludge is reduced, the treatment efficiency is lowered, and if the void ratio is high, the gas is easily contained. The density of the carrier is preferably 0.96 to 1.02 g/cm3, and the density of the carrier of 80% or more is 0.98. It is preferably 1.01 g/cm3, particularly preferably 0.98 5 to 1.00 g/cm3. The charge amount of the carrier is preferably from 5 to 50% by volume relative to the water surface WL of the groove 5. On the other hand, when the amount of the carrier is small, the treatment efficiency is lowered, and if it is more than 50%, the stirring power is excessively large. -11 - 201235094 The fluidized bed type biological treatment device (stirring tank) of Figs. 1 and 2 thus constructed 1. The mixer 2 is rotated clockwise and the mixer 3 is rotated counterclockwise. Further, the mixer 2 can be rotated counterclockwise to rotate the mixer 3 clockwise. The opposite directions of the mixers 2, 3 are generated. Rotating water flow. Between these mixers 2, 3 Since the plate-shaped body 4 is in the vicinity of the middle between the agitators 2 and 3, there is no conflict between the swirling water flows. Further, in the region between the agitators 2 and 3, the directions of the respective rotating water flows are identical, thereby preventing mutual mutual The hydraulic flow of the rotating water flow is reduced, whereby the carrier 6 is efficiently stirred in a wide range in the tank 5, and the drainage treatment efficiency is improved. By setting the width of the plate-like body 4 to be the direction of the mixers connecting the two sides The above effect can be more fully achieved by arranging 50% to 90% of the length between the groove walls in the vertical direction. Further, as shown in Figs. 1 and 2, water flows from one end side to the other end side in the longitudinal direction of the groove 5. In the case, the carrier 6 is likely to concentrate on the downstream side in the tank 5. Therefore, it is preferable to set the G 値 of the mixer on the downstream side to be larger than the G 搅拌 of the mixer on the upstream side. For example, it is preferable to set the G 搅拌 of the adjacent downstream mixer to 1.02 to 1.5 times the G 搅拌 of the mixer on the upstream side, and particularly preferably 1.05 to 1.2 times. In the above embodiment, although two agitators 2 and 3 are provided, as shown in FIG. 7, three or more agitators may be provided from the upstream side to the downstream side, and the rotation directions of the adjacent mixers may be opposite directions. It is also possible to arrange the plate-like body 4 between the respective mixers. Fig. 7 is a plan view showing a fluidized bed type biological treatment apparatus (stirring tank) 1C of -12-201235094 in which three mixers 7, 8, and 9 are arranged in a line. In this case, the mixers 7, 9 and the agitator 8 are rotated in opposite directions. In the present invention, the respective agitators may not be arranged in a straight line, but as shown in Fig. 8, they are arranged in a ring shape so as to surround the center of the groove. In this case, the agitator is such that the directions of rotation of the adjacent agitators in the circumferential direction of the ring are opposite, and a plate-like body is provided between the agitators. Fig. 8 is a plan view showing a fluidized bed type biological treatment apparatus 1D in which four agitators 10, 11, 12, and 13 are disposed on a diagonal position. In this case, the mixers 10, 12 and the agitators 11, 13 are rotated in opposite directions. The width of the plate-like body is set to be 50 to 90% from the center of the groove to the length of the groove wall. [Examples] Hereinafter, examples and comparative examples will be described. [Embodiment 1] As shown in Fig. 1 and Fig. 2, the plan view shape has a long octagonal shape in one direction, a length of 1.5 m in the longitudinal direction, a length of 0.75 m in the short side direction, a depth of 1.2 m, and a groove capacity. Two stirred tanks (fluidized bed type biological treatment device) of two mixers 2 and 3 are arranged in the tank 5 of 1.2 m3, and the concentration of N〇3-N is 80 mg/L, Ρ04- at a tank load of 1 kg-N/m3/d. Treatment was carried out by synthesizing drainage with a concentration of 2 mg/L. Further, methanol was added in an amount of three times N. The carrier was a polyolefin-based carrier (average particle diameter: 3 mm) having a density of 1.01 g/cm3, which was 15% of the volume of the tank. The plate-like body 4 is 1.5 m high, -13-201235094 0_45 m wide, and 10 mm thick. Mixers 2 and 3 are flat wings with a radius of 〇.2m (diameter length 0.4 m) and a top and bottom width of 0.3 m. The G 値 of the mixers 2 and 3 is 1 2 0 to 1 7 0 (2 9 to 3 7 rpm. The flow state of the carrier is adjusted.) During the operation, the treated water has a Ν03-Ν concentration of 5 mg/L or less. With the underwater camera confirming the condition of the bottom of the tank 5, the accumulation of the carrier was hardly found. [Comparative Example 1] The fluidized bed type biological treatment device (stirring tank) 1A shown in Fig. 3 and Fig. 4 in which only one agitator 2 is disposed in the center is omitted, and the rest is treated in the same manner as in the embodiment. Raw water. Further, the structures of the agitation tank and the agitator of Figs. 3 and 4 are the same as those of Figs. 1 and 2 except that the plate-like body is omitted. G値 is 120 to 170 (38 to 4 7 rpm. Adjusted according to the flow state of the carrier.) After the operation, the treated water has a no3-n concentration of 14 mg/L. By the observation of the camera in the water, it can be found at the bottom of the tank, especially on the inflow side and the outflow side of the drain far from the mixer, and the carrier is piled up in a large amount [Comparative Example 2] As shown in Fig. 5 and Fig. 6, the omitted plate is used. The fluidized bed type biological treatment apparatus (stirring tank) 1B having the same structure as that of Example 1 except for the shape 4, after the raw water was treated under the same conditions as in Example 1, the treated water had a Ν03-Ν concentration of 9 mg/L. From the observation of the camera in the water, it was found that the carrier was partially deposited from the intermediate portion of the mixer 2 and the mixer 3 to the wall in the longitudinal direction of the groove 5 from -14 to 201235094. As can be clearly seen from the first embodiment and the comparative examples 1 and 2, the fluidity of the carrier can be improved according to the first embodiment, and the treated water quality is improved as compared with the comparative examples i and 2. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a plan view showing a stirring tank according to an embodiment of the present invention. Figure 2 is a cross-sectional view of the Π - Π line of Figure 1. Figure 3 is a plan view of a stirring tank of a comparative example. Figure 4 is a sectional view taken along line IV-IV of Figure 3.匮I 5 is a plan view of a stirring tank of a comparative example. Figure 6 is a cross-sectional view taken along line VI-VI of Figure 5. Fig. 7 is a plan view showing a stirring tank of another embodiment. Fig. 8 is a plan view showing a stirring tank of another embodiment. [Description of main components] h ΙΑ, 1B, 1C, 1D: fluidized bed type biological treatment device (stirring tank) 2, 3, 7, 8, 9, 10, 11, 12, 13: mixer 4: plate-shaped body 5: Slot 6: Carrier-15-