JP3444554B2 - Aerobic biological treatment equipment - Google Patents

Aerobic biological treatment equipment

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Publication number
JP3444554B2
JP3444554B2 JP14413694A JP14413694A JP3444554B2 JP 3444554 B2 JP3444554 B2 JP 3444554B2 JP 14413694 A JP14413694 A JP 14413694A JP 14413694 A JP14413694 A JP 14413694A JP 3444554 B2 JP3444554 B2 JP 3444554B2
Authority
JP
Japan
Prior art keywords
biological treatment
treatment apparatus
raw water
screen
aerobic biological
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP14413694A
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Japanese (ja)
Other versions
JPH07328675A (en
Inventor
浩二 三島
俊博 田中
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ebara Corp
Original Assignee
Ebara Corp
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Priority to JP14413694A priority Critical patent/JP3444554B2/en
Publication of JPH07328675A publication Critical patent/JPH07328675A/en
Application granted granted Critical
Publication of JP3444554B2 publication Critical patent/JP3444554B2/en
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Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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  • Biological Treatment Of Waste Water (AREA)

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、好気性生物処理装置に
係り、特に下水・し尿・産業廃水などの有機性廃水を、
微生物固定化担体を利用して生物学的に処理する好気性
生物処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerobic biological treatment apparatus, and particularly to an organic wastewater such as sewage, night soil, industrial wastewater,
The present invention relates to an aerobic biological treatment device that performs biological treatment using a microorganism-immobilized carrier.

【０００２】[0002]

【従来の技術】近年、土地利用の効率化が叫ばれる国内
においては、より省面積で処理が可能な高性能汚水処理
装置の開発が急務である。この中で、微生物固定化担体
を利用する汚水処理装置は、担体素材の性能向上と相ま
って注目を集めている。本発明者らは、図９に示すよう
な、固定化担体を利用した生物処理装置の開発を行って
きたが、その開発過程で次のような技術的課題に遭遇し
た。2. Description of the Related Art In recent years, in Japan, where the efficiency of land use is being emphasized, there is an urgent need to develop a high-performance sewage treatment apparatus capable of treating an area in a smaller area. Among them, a sewage treatment apparatus that uses a microorganism-immobilized carrier has been attracting attention due to the improved performance of the carrier material. The present inventors have developed a biological treatment apparatus using an immobilized carrier as shown in FIG. 9, and encountered the following technical problems in the development process.

【０００３】すなわち、固定化担体が被処理水とともに
生物処理装置を流下する結果、反応タンク前半部の担体
濃度が低下し、後半部の担体濃度が高くなり、それに伴
って処理性能が著しく低下をきたした。この担体濃度の
片寄りを補正する為に、生物処理装置末端から先端部へ
固定化担体をポンプで返送するラインを増設したが、ポ
ンプにより固定化担体が徐々に破壊された。That is, as a result of the immobilized carrier flowing down the biological treatment apparatus together with the water to be treated, the carrier concentration in the first half of the reaction tank decreases and the carrier concentration in the latter half increases, resulting in a marked decrease in treatment performance. I came. In order to correct this deviation in carrier concentration, a line was added to return the immobilized carrier from the end of the biological treatment apparatus to the tip by a pump, but the immobilized carrier was gradually destroyed by the pump.

【０００４】[0004]

【発明が解決しようとする課題】本発明は、担体濃度分
布の形成を未然に防止し、処理性能の低下を防止できる
好気性生物処理装置を提供することを課題とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide an aerobic biological treatment apparatus capable of preventing formation of carrier concentration distribution and preventing deterioration of treatment performance.

【０００５】[0005]

【課題を解決するための手段】上記課題を解決するため
に、本発明では、微生物を固定化した担体を浮遊状態で
保持する汚水の好気性生物処理装置において、該装置内
の一側面に、複数箇所から原水が供給できる原水供給部
を備え、前記一側面の対向側面の上部水表層部に、微生
物固定化担体の流出を防止するスクリーンを備えた処理
水流出部を複数配備し、該装置内の底部に、原水流入側
と処理水流出側とで風量を調節できる散気装置を設置す
ると共に、該散気装置の風量を原水流入側で多くなるよ
うに調節できる手段を有することとしたものである。In order to solve the above-mentioned problems, in the present invention, an aerobic biological treatment apparatus for wastewater which holds a carrier on which microorganisms are immobilized in a floating state, on one side of the apparatus, The apparatus comprises a raw water supply unit capable of supplying raw water from a plurality of locations , and a plurality of treated water outflow units each having a screen for preventing the outflow of the microorganism-immobilized carrier are provided at the upper water surface layer on the opposite side surface of the one side surface , the bottom of the inner, to installed air diffuser that can adjust the air volume in the raw water inflow side and the treated water outflow side
In addition, the air volume of the air diffuser increases on the raw water inflow side.
Therefore, it is intended to have a means capable of being adjusted .

【０００６】本発明において、使用する固定化担体とし
ては、砂、活性炭、プラスチック片、スポンジ、親水性
ゲルなどの流動性担体が適当であるが、これらに限定さ
れるものではない。なお、担体への微生物固定化手段と
しては付着固定化法が一般的であるが、包括固定化法も
適用可能である。また本発明で使用するスクリーンとし
ては、バースクリーンあるいはウェッジワイヤースクリ
ーンが適当であり、スクリーンの設置方法としてはＶ字
状あるいは台形状水路よりなる越流樋の傾斜面に設置す
るのが望ましい。これにより、格別のスクリーンのサポ
ート部材なしにスクリーンを排水路に固定できる。処理
水排出手段は、スクリーンをその一部に有する越流樋と
したことで、分配供給される原水の偏流がなく、より固
定化担体の均一化が容易となる。In the present invention, the immobilizing carrier to be used is preferably a fluid carrier such as sand, activated carbon, plastic pieces, sponge, hydrophilic gel, but is not limited thereto. As a means for immobilizing microorganisms on a carrier, an attachment immobilization method is generally used, but an entrapping immobilization method is also applicable. A bar screen or a wedge wire screen is suitable as the screen used in the present invention, and it is desirable to install the screen on the inclined surface of the overflow trough consisting of V-shaped or trapezoidal water channels. This allows the screen to be secured to the drain without a special screen support member. Since the treated water discharge means is an overflow gutter having a screen in a part thereof, there is no uneven flow of raw water that is distributed and supplied, and it becomes easier to make the immobilized carrier uniform.

【０００７】スクリーンの通過水量が少ない場合には、
必ずしもＶ字状、台形状に設置する必要はない。また、
スクリーンを通過する水量を均一化するために、スクリ
ーンの内側に、更に集水トラフを設置するのも有効であ
る。さらに本発明では、原水流入側の曝気風量が、処理
水流出側すなわちスクリーン設置側よりも多くなるよう
にすることが好ましく、また、曝気風量を調節可能とす
ることが好ましい。調節手段としては原水流入側の散気
装置（散気板、デフューザなど）を多く設置する、ある
いは散気装置１基あたりの吹き込み風量を多くする等の
手段がある。When the amount of water passing through the screen is small,
It does not necessarily have to be V-shaped or trapezoidal. Also,
In order to make the amount of water passing through the screen uniform, it is also effective to install a water collecting trough inside the screen. Further, in the present invention, it is preferable that the amount of aeration air on the raw water inflow side is larger than that on the treated water outflow side, that is, the screen installation side, and it is preferable that the amount of aeration air can be adjusted. As the adjusting means, there are means for installing a large number of air diffusers (air diffuser, diffuser, etc.) on the raw water inflow side, or increasing the amount of blown air per one air diffuser.

【０００８】本発明の装置は、単一の好気性処理槽だけ
でなく、嫌気−無酸素−好気法や循環式硝化脱窒法の好
気タンクに採用することが可能である。その場合は、無
酸素タンクの活性汚泥流出液を複数に分割し、好気タン
クに流入させればよい。また本発明の生物処理装置の底
面構造は、水勾配を若干もたせる程度のほぼ平らな構造
でもよいが、底面に３０゜〜６０゜の傾斜角をもたせる
と、固定化担体の流動性はさらに向上する。The apparatus of the present invention can be applied not only to a single aerobic treatment tank but also to an aerobic tank of an anaerobic-anoxic-aerobic method or a circulation type nitrification / denitrification method. In that case, the activated sludge effluent of the oxygen-free tank may be divided into a plurality of pieces and allowed to flow into the aerobic tank. The bottom structure of the biological treatment apparatus of the present invention may be a substantially flat structure with a slight water gradient, but if the bottom surface has an inclination angle of 30 ° to 60 °, the fluidity of the immobilization carrier is further improved. To do.

【０００９】[0009]

【作用】本発明により、固定化担体が処理水流出側に偏
るのを未然に防止でき、また偏りによって高濃度になっ
た流出側の固定化担体を、曝気量差によって励起される
流出側から流入側への循環流によって、省エネルギー的
に原水流入部へ返送することが可能である。その結果、
生物処理装置全体において均一な担体濃度となり、高い
処理性能を得ることができる。According to the present invention, the immobilization carrier can be prevented from being biased toward the outflow side of the treated water, and the immobilization carrier on the outflow side having a high concentration due to the imbalance can be removed from the outflow side excited by the difference in aeration amount. The circulation flow to the inflow side enables energy-saving return to the raw water inflow part. as a result,
A uniform carrier concentration is obtained in the entire biological treatment apparatus, and high treatment performance can be obtained.

【００１０】[0010]

【実施例】以下、本発明を実施例により具体的に説明す
るが、本発明はこれらの実施例に限定されるものではな
い。 実施例１ 図１に、本発明の一例である好気性生物処理装置の平面
図を示す。図２は、図１のＡ−Ａ′断面図であり、図３
及び図４は処理水流出部の部分拡大図である。図におい
て、原水は水路１に面する３ヶ所の流入口２ａ、２ｂ、
２ｃから生物処理装置３に流入し、生物処理装置３内部
に設置された仕切り板４を潜った後に曝気部に入る。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. Example 1 FIG. 1 shows a plan view of an aerobic biological treatment apparatus which is an example of the present invention. 2 is a sectional view taken along the line AA ′ of FIG.
And FIG. 4 is a partially enlarged view of the treated water outflow portion. In the figure, the raw water has three inlets 2a, 2b facing the waterway 1,
It flows into the biological treatment apparatus 3 from 2c, passes through the partition plate 4 installed inside the biological treatment apparatus 3, and then enters the aeration unit.

【００１１】生物処理装置３の底部全面には微細気泡デ
フューザ５が配置されており、生物処理装置３の前半部
５ａと後半部５ｂの曝気量はバルブで調節可能である。
処理水流出部には、Ｖ字状の３組のスクリーン８を有す
る越流樋６ａ、６ｂ、６ｃ（図３あるいは図４）が配備
され、処理水はＶ字状スクリーンを有する越流樋を排水
路として流下し、合流した後に水路７を通って流出す
る。スクリーン８はデフューザ５の空気によって常時空
洗状態にさらされる。なお、図４は越流樋６の内側に集
水トラフ９を設けたものである。また、１０は空気導入
口である。A fine bubble diffuser 5 is arranged on the entire bottom surface of the biological treatment apparatus 3, and the aeration amount of the front half 5a and the rear half 5b of the biological treatment apparatus 3 can be adjusted by a valve.
Overflow gutters 6a, 6b, 6c (FIG. 3 or FIG. 4) having three sets of V-shaped screens 8 are provided at the treated water outlet, and the treated water flows through the overflow gutters having V-shaped screens. It flows down as a drainage channel, merges, and then flows out through the water channel 7. The screen 8 is constantly exposed to the air-washed state by the air of the diffuser 5. In addition, in FIG. 4, the water collecting trough 9 is provided inside the overflow gutter 6. Moreover, 10 is an air inlet.

【００１２】実施例２ 図５に、本発明の他の例である好気性生物処理装置の平
面図を示す。図６は図５のＢ−Ｂ′断面図であり、図７
は図５の他のＢ−Ｂ′断面図であり、図８は処理水流出
部の部分拡大図である。図において、原水は分配装置１
１で３つに分配された後に、流入水路１を通り流入口２
ａ、２ｂ、２ｃを通って生物処理装置３に流入する。流
入口２ａ、２ｂ、２ｃは水没状態にし、配管内に曝気空
気が逆流しないように空気流入防止板１２が取り付けて
ある。Embodiment 2 FIG. 5 shows a plan view of an aerobic biological treatment apparatus which is another example of the present invention. 6 is a sectional view taken along line BB ′ of FIG.
5 is another BB 'sectional view of FIG. 5, and FIG. 8 is a partially enlarged view of the treated water outflow portion. In the figure, the raw water is a distributor 1.
1 is divided into 3 parts, and then through the inflow channel 1, the inlet 2
It flows into the biological treatment apparatus 3 through a, 2b, and 2c. The inflow ports 2a, 2b, 2c are submerged in water, and an air inflow prevention plate 12 is attached to prevent backflow of aerated air into the pipe.

【００１３】生物処理装置３の底部には微細気泡デフュ
ーザ５が配置されており、流入側のデフューザ設置数は
流出側の１．３倍としている。処理水流出部には、３組
の台形状スクリーン８を有する越流樋６ａ、６ｂ、６ｃ
（図８）が配備され、処理水は台形状スクリーンを有す
る越流樋を排水路として流入した後に、合流して水路７
を通って流出する。図７は、生物処理装置３の底面に傾
斜を与えた例である。流入部と流出部の曝気風量の比率
は、通常２：１〜３：２の範囲に設定する。A fine bubble diffuser 5 is arranged at the bottom of the biological treatment apparatus 3, and the number of diffusers installed on the inflow side is 1.3 times that on the outflow side. Overflow gutters 6a, 6b, 6c having three sets of trapezoidal screens 8 at the treated water outlet.
(Fig. 8) is provided, and the treated water flows into the overflow gutter having a trapezoidal screen as a drainage channel and then merges into the water channel 7.
Spill through. FIG. 7 is an example in which the bottom surface of the biological treatment device 3 is inclined. The ratio of the amount of aerated air in the inflow section and the outflow section is usually set in the range of 2: 1 to 3: 2.

【００１４】実施例３ 本発明の好気性生物処理装置のアンモニア性窒素（ＮＨ
4 −Ｎ）の硝化プロセスへの適用例を示す。 （ａ）原 水 アンモニア排水（１００ｍｇ−Ｎ／ｌ）、 水量 ６００ｍ3 ／日、Example 3 Ammoniacal nitrogen (NH 3) of the aerobic biological treatment apparatus of the present invention
An example of application of 4- N) to the nitrification process is shown. (A) Raw water ammonia wastewater (100 mg-N / l), water amount 600 m 3 / day,

【００１５】（ｂ）生物処理装置 図１及び図２に示す装置を用いる。 有効容積：３００ｍ3 、 寸 法：幅６ｍ×長１０ｍ×高６ｍ（有効水深５ｍ）、 原水流入部：３ヶ所、 処理水流出部：Ｖ字状スクリーン３組、 スクリーン：ウエッジワイヤ型で目開き２．５ｍｍ、１
枚のスクリーン（０．５ｍ×３ｍ）をＶ字状（傾斜角度
６０゜）で接合したものを１組として３組設置、 曝気方法：前半部（流入側）は１２Ｎｍ3 ／分、後半部
（流出側）は８Ｎｍ3 ／分、散気装置は同数とし、底部
に全面配置した、(B) Biological treatment apparatus The apparatus shown in FIGS. 1 and 2 is used. Effective volume: 300 m 3 , Dimension: Width 6 m x length 10 m x height 6 m (effective water depth 5 m), raw water inflow part: 3 places, treated water outflow part: 3 V-shaped screens, screen: wedge wire type opening 2.5 mm, 1
Three screens (0.5 m x 3 m) joined in a V shape (inclination angle 60 °) are installed as one set. Aeration method: 12 Nm 3 / min in the first half (inflow side), the second half ( Outflow side) was 8 Nm 3 / min, the number of air diffusers was the same, and they were placed all over the bottom.

【００１６】（ｃ）固定化担体 材質：ポリエチレングリコール製の親水性ゲル、 粒径：４ｍｍ、 比重：１．０１〜１．０３、 投入量：かさ体積として６０ｍ3 （充填率２０ｖ／ｖ
％）、(C) Immobilized carrier material: hydrophilic gel made of polyethylene glycol, particle size: 4 mm, specific gravity: 1.01 to 1.03, input amount: 60 m 3 as bulk volume (filling rate 20 v / v
%),

【００１７】（ｄ）運転結果 原水流入側である前半部の担体濃度は１６〜２１ｖ／ｖ
％、処理水流出側である後半部は１９〜２４ｖ／ｖ％で
あり、濃度分布の形成はほぼ僅かであった。硝化率は年
間を通して９５％以下であり、処理水ＮＨ4 −Ｎは５ｍ
ｇ／ｌ以下と良好であった。(D) Result of operation The carrier concentration in the first half of the raw water inflow side is 16 to 21 v / v.
%, The latter half of the treated water outflow side was 19 to 24 v / v%, and the formation of the concentration distribution was almost slight. Nitrification rate is 95% or less throughout the year, and treated water NH 4 -N is 5 m
It was good as g / l or less.

【００１８】[0018]

【発明の効果】本発明によれば微生物固定化担体を利用
する汚水処理装置において、担体濃度分布の形成を回避
でき、高い処理性能を維持できる。According to the present invention, in a sewage treatment apparatus using a microorganism-immobilized carrier, formation of carrier concentration distribution can be avoided and high treatment performance can be maintained.

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

【図１】本発明の好気性生物処理装置の一例を示す平面
図。FIG. 1 is a plan view showing an example of an aerobic biological treatment apparatus of the present invention.

【図２】図１のＡ−Ａ′断面図。FIG. 2 is a sectional view taken along the line AA ′ of FIG.

【図３】処理水流出部の部分拡大図。FIG. 3 is a partially enlarged view of a treated water outflow portion.

【図４】処理水流出部の他の部分拡大図。FIG. 4 is an enlarged view of another part of the treated water outflow portion.

【図５】本発明の好気性生物処理装置の他の例を示す平
面図。FIG. 5 is a plan view showing another example of the aerobic biological treatment apparatus of the present invention.

【図６】図１のＢ−Ｂ′断面図。6 is a sectional view taken along line BB ′ of FIG.

【図７】図１の他のＢ−Ｂ′断面図。FIG. 7 is another cross-sectional view taken along the line BB ′ of FIG.

【図８】処理水流出部の部分拡大図。FIG. 8 is a partially enlarged view of a treated water outflow portion.

【図９】従前の好気性生物処理装置の断面図。FIG. 9 is a sectional view of a conventional aerobic biological treatment apparatus.

【符号の説明】[Explanation of symbols]

１：水路、２ａ、２ｂ、２ｃ：流入口、３：生物処理装
置、４：仕切り板、５：デフューザ、６、６ａ、６ｂ、
６ｃ：越流樋、７：水路、８：スクリーン、９：集水ト
ラフ、１０：空気導入口、１１：分配装置、１２：空気
流入防止板、1: Water channel, 2a, 2b, 2c: Inlet, 3: Biological treatment device, 4: Partition plate, 5: Diffuser, 6, 6a, 6b,
6c: Overflow gutter, 7: Water channel, 8: Screen, 9: Water collection trough, 10: Air inlet, 11: Distribution device, 12: Air inflow prevention plate,

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−252592（ＪＰ，Ａ) 特開 平５−220491（ＪＰ，Ａ) 特開 平５−76894（ＪＰ，Ａ) 特開 平６−328097（ＪＰ，Ａ) 実開 昭63−82500（ＪＰ，Ｕ) 実開 昭58−124293（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 3/08 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-63-252592 (JP, A) JP-A-5-220491 (JP, A) JP-A-5-76894 (JP, A) JP-A-6- 328097 (JP, A) Actually opened 63-82500 (JP, U) Actually opened 58-124293 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) C02F 3/08

Claims (2)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 微生物を固定化した担体を浮遊状態で保
持する汚水の好気性生物処理装置において、該装置内の
一側面に、複数箇所から原水が供給できる原水供給部を
備え、前記一側面の対向側面の上部水表層部に、微生物
固定化担体の流出を防止するスクリーンを備えた処理水
流出部を複数配備し、該装置内の底部に、原水流入側と
処理水流出側とで風量を調節できる散気装置を設置する
と共に、該散気装置の風量を原水流入側で多くなるよう
に調節できる手段を有することを特徴とする好気性生物
処理装置。1. An aerobic biological treatment apparatus for sewage that holds a carrier on which microorganisms are immobilized in a floating state, wherein one side of the apparatus is provided with a raw water supply unit capable of supplying raw water from a plurality of locations. in the upper water surface portion of the opposing sides of the treated water outflow unit provided with a screen to prevent the outflow of the microbe-immobilized carrier and a plurality deployed, the bottom of the said apparatus, the raw water inflow side and the treated water outflow side Install an air diffuser that can adjust the air volume
At the same time, increase the air volume of the air diffuser on the raw water inlet side.
An aerobic biological treatment apparatus having a means for controlling the aerobic organism. 【請求項２】 前記処理水流出部は、側部にスクリーン
を備えた越流樋であることを特徴とする請求項１記載の
好気性生物処理装置。2. The aerobic biological treatment apparatus according to claim 1, wherein the treated water outflow portion is an overflow gutter having a screen on a side portion.
JP14413694A 1994-06-03 1994-06-03 Aerobic biological treatment equipment Expired - Fee Related JP3444554B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14413694A JP3444554B2 (en) 1994-06-03 1994-06-03 Aerobic biological treatment equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14413694A JP3444554B2 (en) 1994-06-03 1994-06-03 Aerobic biological treatment equipment

Publications (2)

Publication Number Publication Date
JPH07328675A JPH07328675A (en) 1995-12-19
JP3444554B2 true JP3444554B2 (en) 2003-09-08

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0882676A1 (en) * 1996-10-29 1998-12-09 Nkk Corporation Support separation screen apparatus, method of aeration of support separation screen, aeration apparatus for the method, waste liquid processing method and apparatus using the screen apparatus and aeration apparatus
JP5468251B2 (en) * 2008-12-26 2014-04-09 株式会社西原環境 Supporting bioreactor
US20120055869A1 (en) * 2009-02-20 2012-03-08 Headworks Bio Inc. Water treatment reactor screening system and method
JP6394977B2 (en) * 2015-03-24 2018-09-26 Ｊｆｅエンジニアリング株式会社 Carrier input type sewage treatment equipment
JP6394976B2 (en) * 2015-03-24 2018-09-26 Ｊｆｅエンジニアリング株式会社 Carrier input type sewage treatment equipment
JP6394980B2 (en) * 2015-04-21 2018-09-26 Ｊｆｅエンジニアリング株式会社 Carrier input type sewage treatment equipment
JP6667188B2 (en) * 2015-08-28 2020-03-18 フジクリーン工業株式会社 Water treatment equipment, water treatment method

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