JP2003205297A - Waste water treating system - Google Patents
Waste water treating systemInfo
- Publication number
- JP2003205297A JP2003205297A JP2002004880A JP2002004880A JP2003205297A JP 2003205297 A JP2003205297 A JP 2003205297A JP 2002004880 A JP2002004880 A JP 2002004880A JP 2002004880 A JP2002004880 A JP 2002004880A JP 2003205297 A JP2003205297 A JP 2003205297A
- Authority
- JP
- Japan
- Prior art keywords
- filter bed
- sludge
- section
- treatment
- bed
- 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.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排水処理装置に関
し、詳しくは、嫌気性処理と好気性処理とを組み合わせ
た生物ろ床法による排水処理装置であって、特に、良好
な処理水質を得るとともに汚泥発生量の低減も図れる排
水処理装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wastewater treatment equipment, and more particularly to a wastewater treatment equipment by a biological filter method in which anaerobic treatment and aerobic treatment are combined, and particularly good treated water quality is obtained. At the same time, it relates to a wastewater treatment device capable of reducing the amount of sludge generated.
【０００２】[0002]
【従来の技術】従来から、排水処理の一手段として、嫌
気性処理と好気性処理とを組み合わせた生物ろ床法によ
る嫌気好気処理が広く行われている。この嫌気好気処理
は、好気性生物処理における比較的短時間で良好な処理
水質が得られるという特性と、嫌気性生物処理における
汚泥発生量が少ないという特性とを組み合わせたもので
あって、良好な処理水質が得られるとともに汚泥発生量
が比較的少なく、動力費も少ないという利点を有してい
る。2. Description of the Related Art Conventionally, an anaerobic aerobic treatment by a biological filter method, which is a combination of an anaerobic treatment and an aerobic treatment, has been widely performed as a means for treating wastewater. This anaerobic / aerobic treatment is a combination of the characteristic that good treated water quality can be obtained in a relatively short time in aerobic biological treatment and the characteristic that the amount of sludge generated in anaerobic biological treatment is small. It has the advantages that excellent treated water quality can be obtained, the amount of sludge generated is relatively small, and the power cost is also low.
【０００３】[0003]
【発明が解決しようとする課題】しかし、従来の嫌気好
気処理を行う排水処理装置は、嫌気性生物処理を行う嫌
気性ろ床では、閉塞を防止するために大きなサイズの接
触材を使用する必要があり、必ずしも効果的な生物保持
ができず、さらに、沈殿汚泥の効果的な引き抜きもでき
ないという問題もあった。また、好気性生物処理を行う
好気性ろ床では、一般に直径３〜５ｍｍ程度のアンスラ
サイト等のろ材を使用していることから、１日に１回程
度の洗浄を必要とするという問題があった。さらに、脱
窒処理を行うために好気性処理を行った処理水を硝化液
として嫌気性処理ゾーンに循環させると、硝化液中の溶
存酸素や硝酸等の結合酸素が嫌気性処理ゾーンに流入す
ることになり、嫌気性処理ゾーンの嫌気度合いが低下し
て汚泥の嫌気的分解が阻害され、汚泥発生量が増加して
しまう場合がある。However, in the conventional wastewater treatment apparatus for anaerobic / aerobic treatment, a large-sized contact material is used to prevent clogging in an anaerobic filter bed for anaerobic biological treatment. However, there is also a problem that it is not always possible to effectively retain organisms, and furthermore, it is not possible to effectively withdraw the sludge from sedimentation. Further, in an aerobic filter bed that performs aerobic biological treatment, since a filter material such as anthracite having a diameter of about 3 to 5 mm is generally used, there is a problem that cleaning is required about once a day. It was Furthermore, when the treated water that has been subjected to aerobic treatment for denitrification is circulated in the anaerobic treatment zone as nitrification liquid, dissolved oxygen in the nitrification liquid and bound oxygen such as nitric acid flow into the anaerobic treatment zone. In some cases, the degree of anaerobicity in the anaerobic treatment zone is reduced, the anaerobic decomposition of sludge is hindered, and the amount of sludge generated may increase.
【０００４】しかも、硝化液循環による窒素除去を主目
的とした嫌気好気処理は１〜１２時間という比較的短時
間で行われるが、汚泥発生量の削減を目的とした嫌気処
理は１〜２日という比較的長時間で行われるため、従来
の各１槽ずつの装置構成で窒素除去と汚泥発生量削減と
を同時に満足させることは困難であり、汚泥発生量を削
減するためには、汚泥の嫌気的分解を絶対嫌気状態で行
う嫌気処理槽を増設するようにしていた。Moreover, the anaerobic aerobic treatment mainly for removing nitrogen by circulating the nitrifying solution is carried out in a relatively short time of 1 to 12 hours, while the anaerobic treatment for the purpose of reducing the amount of sludge is 1-2. Since it is performed for a relatively long time of day, it is difficult to satisfy both the nitrogen removal and the sludge generation amount reduction with the conventional device configuration for each one tank at the same time. An additional anaerobic treatment tank was installed to perform the anaerobic decomposition of the above in an absolutely anaerobic state.
【０００５】そこで本発明は、汚泥発生量が少なく、か
つ、良好な処理水質が得られるとともに、脱窒処理も問
題なく行うことができ、しかも、装置全体の小型化も図
れる排水処理装置を提供することを目的としている。Therefore, the present invention provides a wastewater treatment equipment which produces a small amount of sludge, obtains a good treated water quality, can perform denitrification treatment without problems, and can downsize the entire equipment. The purpose is to do.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するた
め、本発明の排水処理装置は、排水の嫌気好気処理を行
う排水処理装置であって、処理槽の下部に設けた絶対嫌
気状態で生物処理を行う第一ろ床部と、該第一ろ床部の
上部に設けた無酸素状態で生物処理を行う第二ろ床部
と、該第二ろ床部の上部に設けた好気状態で生物処理を
行う第三ろ床部と、前記第一ろ床部の下方に設けた原水
流入部と、処理槽の底部に設けた汚泥濃縮部及び沈殿汚
泥抜取部と、前記第三ろ床部の上方に設けた処理水排出
部と、前記第三ろ床部の下方に設けた散気手段と、前記
第三ろ床部の上方の処理水の一部を抜き出して前記第二
ろ床部の下方に流入させる硝化液循環経路とを備えてい
ることを特徴としている。In order to achieve the above object, the wastewater treatment equipment of the present invention is a wastewater treatment equipment for performing anaerobic aerobic treatment of wastewater, and in an absolute anaerobic state provided at the bottom of a treatment tank. A first filter bed for biological treatment, a second filter bed for biological treatment under anoxic conditions provided on the first filter bed, and an aerobic gas provided on top of the second filter bed. A third filter bed for biological treatment in a state, a raw water inflow section provided below the first filter bed section, a sludge concentrating section and a sludge withdrawing section provided at the bottom of the treatment tank, and the third filter section. The treated water discharge part provided above the floor part, the aeration means provided below the third filter part, and a part of the treated water above the third filter part are extracted to obtain the second filter. It is characterized in that it is provided with a nitrification liquid circulation path that flows into the bottom of the floor.
【０００７】さらに、本発明の排水処理装置は、前記第
三ろ床部に比重が異なる２種類の生物担体を使用し、下
部の流動床と上部の固定床とを形成したこと、前記汚泥
濃縮部に汚泥掻寄手段を設けたこと、前記第一ろ床部に
撹拌手段を設けたことを特徴としている。Further, in the wastewater treatment equipment of the present invention, two types of biological carriers having different specific gravities are used in the third filter bed section to form a lower fluidized bed and an upper fixed bed. It is characterized in that a sludge scraping means is provided in the section and a stirring means is provided in the first filter bed section.
【０００８】[0008]
【発明の実施の形態】図１は本発明の排水処理装置の一
形態例を示す系統図である。この排水処理装置は、一つ
の処理槽１０に、底部側から順に、汚泥を濃縮沈殿させ
るための汚泥濃縮部１１，絶対嫌気状態で生物処理を行
う第一ろ床部１２，無酸素状態で生物処理を行う第二ろ
床部１３，好気状態で生物処理を行う第三ろ床部１４を
適当な仕切材を介して形成したものであって、第一ろ床
部１２の下方には原水流入部１５、処理槽底部には沈殿
汚泥抜取部１６、第三ろ床部１４の上方には処理水排出
部１７及び硝化液循環経路１８の流出部がそれぞれ設け
られるとともに、第二ろ床部１３の下方には硝化液循環
経路１８の流入部が設けられている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a system diagram showing an example of an embodiment of wastewater treatment equipment of the present invention. This wastewater treatment device comprises, in one treatment tank 10, a sludge concentrating section 11 for concentrating and precipitating sludge in order from the bottom side, a first filter bed section 12 for performing biological treatment in an absolutely anaerobic state, and an anoxic organism. A second filter bed section 13 for treatment and a third filter bed section 14 for biological treatment in an aerobic state are formed through an appropriate partition material, and raw water is provided below the first filter bed section 12. An inflow section 15, a settling sludge extraction section 16 at the bottom of the treatment tank, a treated water discharge section 17 and an outflow section of the nitrification solution circulation path 18 are provided above the third filter bed section 14, respectively, and the second filter bed section is also provided. An inflow portion of the nitrification liquid circulation path 18 is provided below the unit 13.
【０００９】さらに、前記汚泥濃縮部１１には、沈殿し
た汚泥を沈殿汚泥抜取部１６に掻き寄せるための汚泥掻
寄手段として、ピケットフェンス付の汚泥掻寄機１９が
設けられ、第一ろ床部１２には、該第一ろ床部内に充填
した生物担体を撹拌する撹拌手段としてスクリューリボ
ン型の撹拌羽根２０が設けられている。この汚泥掻寄機
１９と撹拌羽根２０とは、槽上部に設置したモーター２
１により駆動される回転軸２２に取り付けられ、ゆっく
りとした速度、例えば毎分１〜１０回転程度の速度で、
連続的あるいは間欠的、特に、３０分から２時間に１回
程度、回転するように形成されている。Further, the sludge concentrating unit 11 is provided with a sludge scraper 19 with a picket fence as a sludge scraping unit for scraping the settled sludge to the settled sludge extracting unit 16, and the first filter bed. The section 12 is provided with a screw ribbon type stirring blade 20 as a stirring means for stirring the biological carrier filled in the first filter bed section. The sludge attractor 19 and the stirring blade 20 are the motor 2 installed at the top of the tank.
1 is attached to a rotary shaft 22 driven by 1, and at a slow speed, for example, about 1 to 10 revolutions per minute,
It is formed so as to rotate continuously or intermittently, particularly about once every 30 minutes to 2 hours.
【００１０】また、前記第一ろ床部１２及び第二ろ床部
１３には、従来のものに比べて小さなサイズで、かつ、
比重を１より僅かに大きく調整した生物担体、例えば、
直径２０ｍｍ程度、長さ２０ｍｍ程度、肉厚１ｍｍ程度
の中空円筒状の発泡ポリプロピレン製で、比表面積が約
５００ｍ２／ｍ３であって、比重を約１．０５に調整し
た生物担体を充填している。このような生物担体を使用
することにより、生物を効率よく保持でき、嫌気性処理
を効果的に行うことができる状態で、生物担体を下部仕
切材上に沈殿させた固定床とすることができる。Further, the first filter bed portion 12 and the second filter bed portion 13 are smaller in size than conventional ones, and
Biological carriers whose specific gravity is adjusted to slightly higher than 1, for example,
It is made of hollow cylindrical expanded polypropylene with a diameter of about 20 mm, a length of about 20 mm, and a wall thickness of about 1 mm, and has a specific surface area of about 500 m 2 / m 3 and is filled with a biological carrier whose specific gravity is adjusted to about 1.05. ing. By using such a biological carrier, it is possible to form a fixed bed in which the biological carrier is precipitated on the lower partitioning material in a state where the biological carrier can be efficiently retained and the anaerobic treatment can be effectively performed. .
【００１１】一方、前記第三ろ床部１４は、比重が異な
る２種類の生物担体を充填し、例えば、直径１０ｍｍ程
度、長さ１０ｍｍ程度、肉厚１ｍｍ程度の前記同様の中
空円筒状の発泡ポリプロピレン製で、アンスラサイト等
のろ材に比べてサイズが大きく、かつ、空隙率も大き
く、比表面積が約８００ｍ２／ｍ３であって、比重を略
１．０、例えば約０．９８に調整した生物担体と、比重
を約０．９３に調整した生物担体とを充填し、比重が
０．９８の生物担体からなる下部の流動床２３と、比重
が約０．９３の生物担体からなる上部の固定床２４とを
形成するようにしている。On the other hand, the third filter bed portion 14 is filled with two kinds of biological carriers having different specific gravities, for example, the same hollow cylindrical foam having a diameter of about 10 mm, a length of about 10 mm and a wall thickness of about 1 mm. Made of polypropylene, larger in size and larger in porosity than filter media such as anthracite, with a specific surface area of about 800 m 2 / m 3 and a specific gravity adjusted to about 1.0, for example about 0.98 And a biological carrier having a specific gravity adjusted to about 0.93, the lower fluidized bed 23 made of the biological carrier having a specific gravity of 0.98, and the upper part made of the biological carrier having a specific gravity of about 0.93. And a fixed bed 24 of.
【００１２】固定床２４に上述のようなサイズの生物担
体を使用することにより、ろ過機能を併せ持たせること
ができるので、第三ろ床部１４において好気的な生物処
理とろ過処理とを同時に行うことができる。また、第三
ろ床１４の下方には散気装置２５が設けられており、第
三ろ床１４に散気空気を供給して十分な好気性状態を得
るとともに、流動床２３の生物担体を流動化させてい
る。By using a biological carrier having the above-mentioned size for the fixed bed 24, it is possible to have a filtering function at the same time. Therefore, aerobic biological treatment and filtering treatment are performed in the third filter bed section 14. Can be done at the same time. Further, an air diffuser 25 is provided below the third filter bed 14 to supply diffused air to the third filter bed 14 to obtain a sufficient aerobic condition, and to prevent the biological carrier of the fluidized bed 23 from being used. It is fluidized.
【００１３】さらに、好気処理水の一部である硝化液を
導入する硝化液循環経路１８を前記第二ろ床部１３の下
方に設け、一般的な脱窒処理のように硝化液を原水中や
嫌気処理槽に循環させるのではなく、第一ろ床部１２よ
り上方に硝化液を循環流入させることにより、硝化液の
循環流入によって第一ろ床部１２での嫌気度合いが低下
し、嫌気処理効率が低下することを回避できる。同時
に、第一ろ床部１２における原水の滞留時間も長くして
汚泥の嫌気的分解効果を向上させることができる。Further, a nitrification solution circulation path 18 for introducing a nitrification solution, which is a part of the aerobic treated water, is provided below the second filter bed section 13 to supply the nitrification solution as in a general denitrification process. By circulating the nitrification liquid above the first filter bed portion 12 instead of circulating it in water or the anaerobic treatment tank, the anaerobic degree in the first filter bed portion 12 decreases due to the circulation inflow of the nitrification liquid, It is possible to avoid a decrease in anaerobic treatment efficiency. At the same time, the residence time of the raw water in the first filter bed section 12 can be lengthened to improve the anaerobic decomposition effect of sludge.
【００１４】また、第二ろ床部１３の下方で第一ろ床部
１２の上方には、第二ろ床部１３及び第三ろ床部１４の
空洗用空気を供給する曝気装置２６と、洗浄排水を排出
するための洗浄排水流出部２７が設けられている。第二
ろ床部１３及び第三ろ床部１４に充填する生物担体とし
て、前述のように、従来のろ材と比較してサイズが大き
く、空隙率も大きな生物担体を使用することにより、目
詰まりの発生が抑制されるので、生物担体の洗浄頻度を
少なくできるとともに、洗浄操作も容易となり、通常
は、１〜７日に１回程度の空洗及び排水を行うだけで十
分なものとなる。このときの洗浄排水量は、第一ろ床部
１２を含めた全体を洗浄する場合に比べて数分の一に低
減することができるので、洗浄時間を短縮できるととも
に、動力費の削減も図れる。Further, below the second filter bed section 13 and above the first filter bed section 12, there is provided an aeration device 26 for supplying the air for washing the second filter bed section 13 and the third filter bed section 14 with air. A cleaning waste water outflow portion 27 for discharging the cleaning waste water is provided. As described above, as a biological carrier to be filled in the second filter bed part 13 and the third filter bed part 14, clogging is caused by using a biological carrier having a large size and a large porosity as compared with the conventional filter media. As a result, the frequency of washing the biological carrier can be reduced, and the washing operation is facilitated. Usually, it is sufficient to perform the air washing and draining once every 1 to 7 days. Since the amount of waste water to be washed at this time can be reduced to a fraction of that in the case where the whole including the first filter bed 12 is washed, the washing time can be shortened and the power cost can be reduced.
【００１５】前記原水流入部１５には、流入原水を整流
して汚泥の沈殿を促進するための整流筒２８が設けられ
ており、原水流入部１５から流入した原水は、この整流
筒２８によって処理槽底部に向けて緩やかに流入した
後、上向流となって処理槽１０内を上昇する。また、処
理槽底部に沈殿した汚泥を前記汚泥掻寄機１９で撹拌す
ることにより、沈殿汚泥抜取部１６から汚泥を抜き取る
際の水道の形成を防止できるとともに、汚泥の嫌気的分
解で発生するメタンや炭酸ガス等のガス成分を速やかに
汚泥中から排除することができる。The raw water inflow section 15 is provided with a straightening cylinder 28 for rectifying the inflowing raw water to promote sludge settling, and the raw water flowing in from the raw water inflow section 15 is processed by the straightening cylinder 28. After gently flowing toward the bottom of the tank, it becomes an upward flow and rises in the processing tank 10. In addition, by stirring the sludge settling on the bottom of the treatment tank with the sludge scraper 19, it is possible to prevent the formation of a tap water when the sludge is extracted from the settling sludge extraction unit 16 and to generate methane by anaerobic decomposition of the sludge. Gas components such as carbon dioxide and carbon dioxide can be promptly removed from the sludge.
【００１６】さらに、前記撹拌羽根２０によって第一ろ
床部１２の生物担体を適当に撹拌することにより、第一
ろ床部１２で閉塞が発生することを防止でき、第一ろ床
部１２を洗浄する必要がなくなる。また、第一ろ床部１
２における水理学的滞留時間を２４時間程度にして従来
の嫌気性ろ床と同程度にすることにより、効果的な汚泥
分解処理を行うことができる。Further, by appropriately stirring the biological carrier in the first filter bed portion 12 by the stirring blade 20, it is possible to prevent the first filter bed portion 12 from being clogged, and to prevent the first filter bed portion 12 from being clogged. No need to wash. In addition, the first filter bed 1
By setting the hydraulic retention time in 2 to about 24 hours and making it about the same as the conventional anaerobic filter bed, effective sludge decomposition treatment can be performed.
【００１７】一方、第二ろ床部１３及び第三ろ床部１４
を第一ろ床部１２に比べて小さくすることにより、第二
ろ床部１３及び第三ろ床部１４での処理時間を１〜１２
時間にして効果的な窒素除去を行えるとともに、第二ろ
床部１３及び第三ろ床部１４の洗浄設備を簡易にでき、
しかも、処理槽全体の小型化が図れる。On the other hand, the second filter floor portion 13 and the third filter floor portion 14
Is smaller than that of the first filter bed section 12, so that the processing time in the second filter bed section 13 and the third filter bed section 14 is 1 to 12
In addition to being able to effectively remove nitrogen in time, it is possible to simplify the cleaning equipment for the second filter bed 13 and the third filter bed 14,
Moreover, the overall size of the processing tank can be reduced.
【００１８】このような処理槽１０を有する排水処理設
備において、下水等の原水は、沈砂地５１で沈砂処理及
びスクリーン処理されて流量調整槽５２に流入し、ポン
プ５３によりある程度の流量調整が行われて原水流入部
１５から整流筒２８を通って処理槽１０の汚泥濃縮部１
１に流入する。原水中の汚泥は、一部が汚泥濃縮部１１
で沈殿分離され、残部が原水とともに槽内を上昇して第
一ろ床部１２に流入し、第一ろ床部１２での絶対嫌気状
態における嫌気性生物処理によって嫌気的に分解され
る。In the waste water treatment facility having the treatment tank 10 as described above, raw water such as sewage is subjected to sand sedimentation and screen treatment in the sand sedimentation site 51 and flows into the flow rate adjustment tank 52, and the flow rate is adjusted to some extent by the pump 53. From the raw water inflow section 15 to the sludge condensing section 1 of the treatment tank 10 through the straightening cylinder 28.
Flow into 1. Part of the sludge in the raw water is the sludge thickening section 11
The precipitate is separated and separated, and the remaining part rises in the tank together with the raw water and flows into the first filter bed 12, and is anaerobically decomposed by the anaerobic biological treatment in the first filter bed 12 in an absolutely anaerobic state.
【００１９】第一ろ床部１２を出た原水は、硝化液循環
経路１８から循環流入する硝化液と混合して第二ろ床部
１３に流入し、ここでの無酸素状態における生物処理に
よって主として脱窒処理が行われる。脱窒処理後の原水
は、第二ろ床部１３から出て散気装置２５からの散気空
気と共に上部の第三ろ床部１４に流入し、この第三ろ床
部１４で好気状態における生物処理によって主として硝
化処理が行われるとともにろ過処理が行われる。The raw water leaving the first filter bed 12 is mixed with the nitrification solution circulating from the nitrification solution circulation path 18 and flows into the second filter bed 13, where it is treated by biological treatment in anoxic condition. Denitrification treatment is mainly performed. The raw water after the denitrification process exits from the second filter bed section 13 and flows into the upper third filter bed section 14 together with diffused air from the air diffuser 25, and in the third filter bed section 14, the raw water is in an aerobic state. In the biological treatment in (1), nitrification treatment is mainly performed and filtration treatment is also performed.
【００２０】さらに、第三ろ床部１４の好気性生物処理
により、第一ろ床部１２での汚泥の分解によって発生し
たアンモニアや硫化水素、硫化物等を酸化して悪臭や腐
食性ガスの発生を抑えることもできるので、脱臭設備や
防食対策の簡素化を図ることができる。Further, the aerobic biological treatment of the third filter bed 14 oxidizes the ammonia, hydrogen sulfide, sulfides, etc. generated by the decomposition of the sludge in the first filter bed 12 to produce a bad odor or a corrosive gas. Since the generation can be suppressed, it is possible to simplify deodorizing equipment and anticorrosion measures.
【００２１】このようにして処理された処理水は、第三
ろ床部１４の上方から処理水排出部１７を通って滅菌槽
５４に流出し、最終的に固形塩素剤等により滅菌処理さ
れてから河川等に放流される。また、第三ろ床部１４上
方の処理水の一部は、ポンプ５５により硝化液循環経路
１８に引き抜かれて硝化液として循環する。The treated water treated in this manner flows out from above the third filter bed 14 through the treated water discharge section 17 into the sterilization tank 54, and finally is sterilized with a solid chlorine agent or the like. Is discharged from the river to the river. Further, a part of the treated water above the third filter bed portion 14 is drawn out by the pump 55 into the nitrification solution circulation path 18 and circulates as nitrification solution.
【００２２】さらに、汚泥濃縮部１１で沈殿した汚泥
は、ポンプ５６によって沈殿汚泥抜取部１６から定期的
に引き抜かれ、汚泥貯留槽５７に一端貯留された後、バ
キューム車による搬出や脱水処理が行われる。汚泥の引
き抜きに際しては、汚泥掻寄機１９によって沈殿汚泥を
掻き寄せることにより、汚泥を高濃度で引き抜くことが
可能となる。Further, the sludge settled in the sludge thickening section 11 is regularly withdrawn from the settled sludge extraction section 16 by the pump 56, and once stored in the sludge storage tank 57, it is carried out by a vacuum vehicle and dehydrated. Be seen. When the sludge is drawn out, the sludge scraper 19 draws up the settled sludge so that the sludge can be drawn out at a high concentration.
【００２３】第三ろ床部１４に充填した生物担体の洗浄
操作は、各ポンプ５３，５５，５６を停止し、処理水排
出部１７の弁５８を閉じるとともに、散気装置２５のコ
ンプレッサー５９を停止した状態で、曝気装置２６のブ
ロワ６０を運転して生物担体を曝気撹拌する空洗操作
と、空洗操作終了後に洗浄排水流出部２７の弁６１を開
いて洗浄排水を流量調整槽５２に戻す排水操作とによっ
て行われ、洗浄排水は流量調整槽５２で原水に混合し、
処理槽１０で再び処理される。For washing the biological carrier filled in the third filter bed 14, the pumps 53, 55 and 56 are stopped, the valve 58 of the treated water discharger 17 is closed, and the compressor 59 of the air diffuser 25 is turned on. In the stopped state, the blower 60 of the aeration device 26 is operated to perform an air washing operation for aerating and agitating the biological carrier, and after the air washing operation is completed, the valve 61 of the wash drainage outflow portion 27 is opened to transfer the wash drainage to the flow rate adjusting tank 52. It is performed by returning drainage operation, and the washing drainage is mixed with the raw water in the flow rate adjusting tank 52,
It is processed again in the processing tank 10.
【００２４】このように、生物担体の洗浄操作を空洗と
排水とで行い、逆洗を不要としたことにより、洗浄排水
量を大幅に減少できるとともに、逆洗ポンプや洗浄用水
槽等が不要となり、洗浄設備の簡素化を図れる。As described above, since the washing operation of the biological carrier is performed by the empty washing and the drainage and the backwashing is unnecessary, the washing drainage amount can be greatly reduced, and the backwashing pump and the washing water tank are not required. The cleaning equipment can be simplified.
【００２５】なお、前記硝化液の一部を汚泥濃縮部１１
や第一ろ床部１２に適当量流入させることにより、これ
らのゾーンにおけるｐＨの低下やＯＲＰの低下を防止で
きるとともに、ＯＰＲを−１００〜−２００ＭＶ程度に
維持することによって硫化水素発生量の低減も図れる。
また、流入原水にポリ鉄等の鉄系凝集剤を添加すること
により、汚泥の嫌気的分解や硝化反応を阻害することな
く、リン凝集によるリンの除去を行うことができる。さ
らに、本形態例では、好気性生物処理を行う第三ろ床部
１４を下部の流動床２３と上部の固定床２４とで形成し
たが、第三ろ床部全体を固定床や流動床としてもよい。A part of the nitrification solution is used as a sludge thickening section 11
And a first filter bed 12 to prevent a decrease in pH and ORP in these zones, and maintain the OPR at about -100 to -200 MV to reduce the amount of hydrogen sulfide generated. Can be achieved.
Further, by adding an iron-based flocculant such as polyiron to the inflowing raw water, phosphorus can be removed by flocculation without inhibiting anaerobic decomposition of sludge and nitrification reaction. Further, in the present embodiment, the third filter bed section 14 for performing aerobic biological treatment is formed by the lower fluidized bed 23 and the upper fixed bed 24, but the entire third filter bed section may be used as a fixed bed or a fluidized bed. Good.
【００２６】[0026]
【発明の効果】以上説明したように、本発明の排水処理
装置によれば、汚泥の発生量を少なくしながら良好な処
理水質を得ることができる。また、汚泥濃縮部、第一ろ
床部、第二ろ床部及び第三ろ床部を一つの処理槽にまと
めているので、装置全体の小型化が図れる。As described above, according to the wastewater treatment apparatus of the present invention, it is possible to obtain good treated water quality while reducing the amount of sludge generated. Moreover, since the sludge thickening section, the first filter bed section, the second filter bed section, and the third filter bed section are combined in one processing tank, the overall size of the apparatus can be reduced.
【図１】 本発明の排水処理装置の一形態例を示す系統
図である。FIG. 1 is a system diagram showing an example of an embodiment of wastewater treatment equipment of the present invention.
１０…処理槽、１１…汚泥濃縮部、１２…第一ろ床部、
１３…第二ろ床部、１４…第三ろ床部、１５…原水流入
部、１６…沈殿汚泥抜取部、１７…処理水排出部、１８
…硝化液循環経路、１９…汚泥掻寄機、２０…撹拌羽
根、２１…モーター、２２…回転軸、２３…流動床、２
４…固定床、２５…散気装置、２６…曝気装置、２７…
洗浄排水流出部、２８…整流筒、５１…沈砂地、５２…
流量調整槽、５４…滅菌槽、５７…汚泥貯留槽10 ... Treatment tank, 11 ... Sludge concentration section, 12 ... First filter section,
13 ... 2nd filter bed part, 14 ... 3rd filter bed part, 15 ... Raw water inflow part, 16 ... Sediment sludge extraction part, 17 ... Treated water discharge part, 18
... Nitrification liquid circulation path, 19 ... Sludge scraper, 20 ... Stirring blade, 21 ... Motor, 22 ... Rotating shaft, 23 ... Fluidized bed, 2
4 ... Fixed bed, 25 ... Aeration device, 26 ... Aeration device, 27 ...
Washing waste water outflow portion, 28 ... straightening cylinder, 51 ... sand setting area, 52 ...
Flow rate adjustment tank, 54 ... Sterilization tank, 57 ... Sludge storage tank
Claims (4)
であって、処理槽の下部に設けた絶対嫌気状態で生物処
理を行う第一ろ床部と、該第一ろ床部の上部に設けた無
酸素状態で生物処理を行う第二ろ床部と、該第二ろ床部
の上部に設けた好気状態で生物処理を行う第三ろ床部
と、前記第一ろ床部の下方に設けた原水流入部と、処理
槽の底部に設けた汚泥濃縮部及び沈殿汚泥抜取部と、前
記第三ろ床部の上方に設けた処理水排出部と、前記第三
ろ床部の下方に設けた散気手段と、前記第三ろ床部の上
方の処理水の一部を抜き出して前記第二ろ床部の下方に
流入させる硝化液循環経路とを備えていることを特徴と
する排水処理装置。1. A wastewater treatment device for anaerobic and aerobic treatment of wastewater, comprising a first filter bed provided in a lower part of a treatment tank for performing biological treatment in an absolutely anaerobic state, and an upper part of the first filter bed. A second filter bed for biological treatment under anoxic conditions, a third filter bed for biological treatment under aerobic conditions provided above the second filter bed, and the first filter bed A raw water inflow section provided below the treatment tank, a sludge thickening section and a settled sludge removal section provided at the bottom of the treatment tank, a treated water discharge section provided above the third filtration bed section, and the third filtration bed section. And a nitrification solution circulation path for extracting a part of the treated water above the third filter bed and flowing it into the lower part of the second filter bed. Wastewater treatment equipment to be.
生物担体を使用し、下部の流動床と上部の固定床とを形
成したことを特徴とする請求項１記載の排水処理装置。2. The wastewater treatment equipment according to claim 1, wherein two types of biological carriers having different specific gravities are used in the third filter bed to form a lower fluidized bed and an upper fixed bed. .
ことを特徴とする請求項１記載の排水処理装置。3. The wastewater treatment equipment according to claim 1, wherein sludge attracting means is provided in the sludge concentrating section.
を特徴とする請求項１記載の排水処理装置。4. The wastewater treatment apparatus according to claim 1, wherein the first filter bed is provided with a stirring means.
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|---|---|---|---|
| JP2002004880A JP4034074B2 (en) | 2002-01-11 | 2002-01-11 | Wastewater treatment equipment |
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| JP4034074B2 JP4034074B2 (en) | 2008-01-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1029302C2 (en) * | 2005-06-21 | 2006-12-22 | Pacques Bv | Device and method for purifying waste water. |
| JP2009028720A (en) * | 2007-07-04 | 2009-02-12 | Toshiba Corp | Aeration-less water treatment apparatus |
| JP2017104806A (en) * | 2015-12-09 | 2017-06-15 | 株式会社東芝 | Nitrification-denitrification device |
| CN108624750A (en) * | 2018-05-28 | 2018-10-09 | 赵鹏 | A kind of metallurgical dust sludge leaching device |
| CN113200598A (en) * | 2021-04-13 | 2021-08-03 | 中国科学院海洋研究所 | Self-cleaning fixed bed biological filter device for recirculating aquaculture and use method |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103508561B (en) * | 2013-09-29 | 2014-12-31 | 浙江大学 | Segmented oxygen supply self-circulation denitrification reactor |
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2002
- 2002-01-11 JP JP2002004880A patent/JP4034074B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1029302C2 (en) * | 2005-06-21 | 2006-12-22 | Pacques Bv | Device and method for purifying waste water. |
| WO2006137736A2 (en) * | 2005-06-21 | 2006-12-28 | Paques B.V. | Device and method for treatment of waste water |
| WO2006137736A3 (en) * | 2005-06-21 | 2007-04-05 | Pacques Bv | Device and method for treatment of waste water |
| JP2009028720A (en) * | 2007-07-04 | 2009-02-12 | Toshiba Corp | Aeration-less water treatment apparatus |
| JP2017104806A (en) * | 2015-12-09 | 2017-06-15 | 株式会社東芝 | Nitrification-denitrification device |
| CN108624750A (en) * | 2018-05-28 | 2018-10-09 | 赵鹏 | A kind of metallurgical dust sludge leaching device |
| CN113200598A (en) * | 2021-04-13 | 2021-08-03 | 中国科学院海洋研究所 | Self-cleaning fixed bed biological filter device for recirculating aquaculture and use method |
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|---|---|
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