JPS60197295A - "tater-bed" biological treatment apparatus - Google Patents

Abstract

PURPOSE:To enhance purification efficiency, by packing a porous inorg. substance, of which the density is 0.4-1.0g/cm<3> and the particle size is 3-15mm. as a carrier so that the ratio of the static layer volume of the carrier to a ''tater- bed'' is adjusted to 20-80vol%. CONSTITUTION:An upper screen 2a and a lower screen 2b each having a mesh width smaller than the particle size of a carrier are provided in a treating tower or tank 1 in two upper and lower stages. Sewage is introduced from the pipe 5 below the lower screen 2b and air is blown into the sewage through a porous air diffusion disc 4. Oxygen required in sustaining existing microorganisms is supplied by the aeration from the air diffusion disc 4 and the up-and-down fluidization of the carrier is performed. Further, microorganism flocs released from the carrier by sludging due to rising air bubbles in the lower part of the upper screen 2a are added to said upper screen 2a to prevent the clogging thereof. Purified treated water is discharged along with flocs from a drain pipe 6 above the upper screen 2a.

Description

【発明の詳細な説明】 この発明は、粒径数Ｉの無機物担体を使用するティータ
・ベット型流動床生物処理装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a teeter-bed type fluidized bed biological treatment apparatus using an inorganic carrier having a particle size of several I.

ンも水の流動床生物処理装置に用いられる担体として疎
水性高分子化合物の発泡体が提案されているが、このも
のは発泡体ではあっても汚水浄化に有用な微生物膜の付
着性が低く充分な浄化効率が得られない。A foam made of a hydrophobic polymer compound has been proposed as a carrier for use in a fluidized bed biological treatment system for water. Sufficient purification efficiency cannot be obtained.

一方、砂、破砕礫、活性炭等の無機物は微生物膜の付着
性は優れているが、比重が大きいためその流動化には大
きな動力が必要であり、生物処理装置としてよりはむし
ろ固定床として濾過装置或は吸着装置として使用されて
いる。On the other hand, inorganic substances such as sand, crushed gravel, and activated carbon have excellent adhesion properties for microbial films, but their high specific gravity requires large amounts of power to fluidize them, so they are used as fixed beds rather than as biological treatment equipment. It is used as a device or adsorption device.

またこれらの無機物質を微細にして流動化し易い担体に
しても汚水の処理過程で、微生物膜が付、７７肥大化し
て行き粒径変化、比重変化を来たし、更に担体同志の膜
融着が起こり易い。Furthermore, even if these inorganic substances are made into microscopic carriers that are easily fluidized, during the wastewater treatment process, microbial membranes 77 enlarge, resulting in changes in particle size and specific gravity, and further, membrane fusion between carriers occurs. easy.

本発明の目的は、ティータ・べ−／　ト型流動床内の相
体表面に棲息する好気的又は嫌気的微生物と汚水の接触
性を良くして浄化効率を向上させると共に、浄化の結果
生成する付着微生物膜を担体同志の衝突及び摩擦作用に
よって剥離して余剰の微生物フロックを浄化水に懸濁さ
せてティータ拳ベット外に自動的に流出させることであ
る。The purpose of the present invention is to improve the purification efficiency by improving the contact between aerobic or anaerobic microorganisms living on the surface of the phase in a Teeta-Bet type fluidized bed and wastewater, and to improve the purification efficiency. The attached microbial film is peeled off by the collision and friction between the carriers, and the excess microbial flocs are suspended in purified water and automatically flowed out of the Teeta fist bed.

而して、本発明は密度０．４〜１．０ｇ／ｃ峠粒径３〜
１５ｍ＋ｗの多孔質無機物担体をティータ・べ−／　ト
に対　゛する該担体の静止層容積の比が２０〜８０％と
した生物処理装置を提供するものである。Therefore, the present invention has a density of 0.4 to 1.0 g/c and a grain size of 3 to 3.
The present invention provides a biological treatment device in which the ratio of the static layer volume of a 15 m+w porous inorganic carrier to the teeter bed is 20 to 80%.

担体を数腸■以上の粗粒とすることにより、■処理過程
における微生物付着による粒径変化、比重変化及び粒子
−融着等が微粉４１４体に比較して小さいこと、　＜ｋ
＋微生物膜付着担体相互間の衝突、摩擦が微粉に較べて
大きく、Ｊｊ１体の肥大化を防ぎ易いこと、・３１剥離
した微生物フロックと押体との粒径差が大きいので床内
からそのフロックを除外し易い等の利点がある。By making the carrier into coarse particles of several microorganisms or more, ■ changes in particle size, changes in specific gravity, particle-fusion, etc. due to microbial adhesion during the treatment process are smaller than those of fine powder, <k
+Collision and friction between microbial film-attached carriers is greater than that of fine powder, making it easier to prevent the Jj1 body from enlarging; ・31 Since the difference in particle size between the detached microbial floc and the pressed body is large, the floc can be removed from within the bed. It has the advantage of being easy to exclude.

一方、欠点として考えられることは（ｌ、・流動性が低
いこと、・、シ）担体表面積が比較的小さくなることが
あるが、欠点（ｉｌについては軽石等の多孔質鉱物の不
定形破砕物、頁岩等から成型した球状の軽猜骨材を使用
することにより解決されうる。On the other hand, the possible drawbacks are (l, low fluidity, c) the surface area of the carrier may be relatively small; This problem can be solved by using spherical light aggregate molded from shale or the like.

本発明においては、担体が吸水した状態で比重が　１よ
り若干大きくなるように吸水前あ比重が０．４〜　ｌの
範囲のものを使用する。In the present invention, a carrier having a specific gravity in the range of 0.4 to 1 before absorbing water is used so that the specific gravity in the state of absorbing water is slightly greater than 1.

また欠ｊ：」・２、・に対してはティータ争ベットに対
して押体の静止層容積比を２０〜８０％（容積）の範囲
で充填することによって１通常の固定床処理装置の１床
における最密充崩状！１１より大きい表面積が得られる
のである。In addition, for missing j:''・2,・, by filling the stationary layer volume ratio of the pushing body in the range of 20 to 80% (volume) for the teeter competition bet, 1 of the normal fixed bed processing equipment. Close-packed collapse on the floor! A surface area greater than 11 is obtained.

例えば押体粒径３■の場合、濾床最密充填状態での担体
表面積は約７３５ｍ’／ｍ’であるから静止層容積比が
２０〜８０％の範囲では　１４７〜５８８ｍ’／ｒｎ’
となり１通常の固定床生物処理装置の最密充填状態での
表面積の７０〜２００ｍ’／ｍ”より約２倍大きい表面
積となる。For example, in the case of a pressed particle size of 3 cm, the surface area of the carrier when the filter bed is most closely packed is about 735 m'/m', so when the static layer volume ratio is in the range of 20 to 80%, it is 147 to 588 m'/rn'.
This results in a surface area that is approximately twice as large as the 70 to 200 m'/m'' surface area of a normal fixed-bed biological treatment apparatus in its closest packed state.

なお、本発明における玉記充填範囲の下限２０％は担体
の粒径下限３ｍｍのときでも少なくとも従来の固定床濾
床の表面積が得られる限界であって、２０％以下になる
と濾床内に棲ｎ、出来る微生物猜が減少して浄化効率を
低下させることになる。In addition, the lower limit of 20% of the filling range of Tamaki in the present invention is the limit at which at least the surface area of the conventional fixed bed filter bed can be obtained even when the particle size of the carrier is the lower limit of 3 mm. n. The number of microorganisms that can be formed is reduced, resulting in a decrease in purification efficiency.

また、」−限値８０％は濾床の担体がティータ型流動が
可能な限界であり、これ以−ヒでは担体同志の衝突が少
なくなり、微生物１１！２の肥大化が進み、フロックの
生成排出が困難になる。In addition, the limit value of 80% is the limit at which the carriers in the filter bed can undergo Teeter-type flow, and beyond this point, collisions between the carriers decrease, the enlargement of microorganisms 11!2 progresses, and the formation of flocs. Difficult to drain.

本発明実施例装置を第１Ｕ；４につい“Ｃ説明すると、
（１）は処理塔又は槽であって、１−ド２段に押体粒径
より小さい目串のＬ部スクリーン（２ａ）と下部スクリ
ーン（２ｂ）が設けられている。（３）は７１４体であ
って前記した容積範囲で所定酸充填されている。汚水は
下部スクリーン（２ｂ）の下方から導入（５）されると
共に多孔散気盤（４）を通して空気が吹き込まれる。散
気盤からの曝気によって、棲息微生物に必要な酸素が供
給されると共に担体の上１°流動が行われる。To explain the device according to the embodiment of the present invention with respect to 1st U; 4,
(1) is a treatment tower or tank, and is provided with an L portion screen (2a) and a lower screen (2b) having a mesh size smaller than the particle size of the pressed body in two stages. (3) is 714 units and is filled with a predetermined amount of acid in the volume range mentioned above. Sewage is introduced (5) from below the lower screen (2b) and air is blown through the porous diffuser (4). Aeration from the aeration plate supplies oxygen necessary for the resident microorganisms, and also causes the carrier to flow 1° above the carrier.

更に、ｊ二部スクリーン（２ａ）の下面では上昇気泡に
よるスラッゼングによって、担体から剥離した微生物フ
ロ・ンクがスクリーンに付着して１品りするのが防止さ
れる。Further, on the lower surface of the two-part screen (2a), sludging by rising air bubbles prevents microbial flocs separated from the carrier from adhering to the screen and becoming a single product.

浄化処理水は」一部スクリーンより−Ｌ方の排水管（６
）からフロックと１（にＩＡ出される。The purified water is drained from the drain pipe (6) on the L side from the partial screen.
) to the flock and 1().

第２図の装置においては、スクリーン（２ｃ）が水面に
（Ｑ置されて槽壁の溢流口に張設されており、７１４体
は水中パラキレータ（７）からの気液混合流によって攪
拌流動化される。In the device shown in Figure 2, a screen (2c) is placed on the water surface (Q) and stretched over the overflow port of the tank wall, and the 714 bodies are stirred and flowed by the gas-liquid mixed flow from the underwater parachelator (7). be converted into

この装置において、担体は槽内の水に遠心力を与えると
共に外気に接して空気を取り入れる。In this device, the carrier applies centrifugal force to the water in the tank and also brings in air by coming into contact with the outside air.

上記各装置を嫌気性微生物に適用する場合は空気に替え
て窒素ガス等を導入するか又は密閉槽では攪拌機によっ
て混合接触させればよい、。When applying each of the above devices to anaerobic microorganisms, nitrogen gas or the like may be introduced instead of air, or mixing and contact may be carried out using a stirrer in a closed tank.

【図面の簡単な説明】[Brief explanation of drawings]

第１図、：５２図は大々木発明の実施例装置の断面図で
ある。Figure 1: Figure 52 is a sectional view of an embodiment of the Ooki invention.

Claims (1)

【特許請求の範囲】[Claims] 密度０．４〜１．０ｇ／ｃｍ”、粒径３〜１５＋ａｍｃ
７）多孔質無機物を担体とし、ティータ・ベットに対す
る該１０体の静止層容積の比が２０〜８０％（容１）と
なるように充填したことを特徴とするティータ・ベット
生物処理装置。Density 0.4-1.0g/cm", particle size 3-15+amc
7) A Teeter Bed biological treatment device, characterized in that a porous inorganic material is used as a carrier, and the carrier is filled so that the volume ratio of the 10 static layers to the Teeter Bed is 20 to 80% (volume 1).