JP2001353500A - Sludge treating method using carbonized sludge - Google Patents
Sludge treating method using carbonized sludgeInfo
- Publication number
- JP2001353500A JP2001353500A JP2000177543A JP2000177543A JP2001353500A JP 2001353500 A JP2001353500 A JP 2001353500A JP 2000177543 A JP2000177543 A JP 2000177543A JP 2000177543 A JP2000177543 A JP 2000177543A JP 2001353500 A JP2001353500 A JP 2001353500A
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- Japan
- Prior art keywords
- sludge
- carbonized
- tank
- mixed
- excess
- 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.)
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- Treatment Of Sludge (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、炭化汚泥を用い
た汚泥処理方法に関し、更に詳細には、下水処理施設の
汚水処理過程で発生する脱水汚泥を炭化した炭化汚泥
を、汚水処理過程での凝集助剤として用いるようにした
炭化汚泥を用いた汚泥処理方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating sludge using carbonized sludge, and more particularly, to a method for treating carbonized sludge obtained by carbonizing dehydrated sludge generated in a sewage treatment facility in a sewage treatment facility. The present invention relates to a sludge treatment method using carbonized sludge to be used as a coagulation aid.
【０００２】[0002]
【従来の技術】下水処理施設では、最初沈殿池に流入す
る一般家庭や事務所、デパート、レストラン等から出る
下水から砂およびし渣を分離し、この第１処理水をエア
レーションタンクに流入させる。エアレーションタンク
では、第１処理水中に存在する種々の好気性微生物によ
り有機物を分解除去させた後、タンク内の微生物により
形成された活性汚泥(フロック)を含んだ第２処理水の一
部を最終沈殿池に流入し、浮遊している活性汚泥を重力
沈降させて分離し、該最終沈殿池の上澄水を処理水とし
て消毒後に放流している。なお、最終沈殿池における沈
殿汚泥の一部は、返送汚泥としてエアレーションタンク
に返送され、該タンク内での微生物濃度を所定濃度に維
持するようになっている。2. Description of the Related Art In a sewage treatment plant, sand and sewage are separated from sewage discharged from general households, offices, department stores, restaurants and the like which first flow into a sedimentation basin, and the first treated water flows into an aeration tank. In the aeration tank, after decomposing and removing organic substances by various aerobic microorganisms present in the first treated water, a part of the second treated water containing activated sludge (floc) formed by the microorganisms in the tank is finally removed. The activated sludge that flows into the sedimentation basin and floats is separated by gravity sedimentation, and the supernatant water of the final sedimentation basin is treated as treated water and then discharged after disinfection. Part of the settling sludge in the final sedimentation tank is returned to the aeration tank as returned sludge, and the concentration of microorganisms in the tank is maintained at a predetermined concentration.
【０００３】また、前記沈殿汚泥の残りである余剰汚泥
は、例えば重力式の濃縮槽に移送されて沈降濃縮され、
得られた濃縮汚泥が貯留槽に貯留される。そして、この
濃縮汚泥を凝集混和装置に供給し、凝集剤を添加したも
とで攪拌混合してから脱水装置で脱水し、得られた脱水
汚泥を炭化炉装置で炭化処理している。[0003] Further, excess sludge, which is the remainder of the settled sludge, is transferred to, for example, a gravity type thickening tank and settled and concentrated.
The obtained concentrated sludge is stored in the storage tank. Then, the concentrated sludge is supplied to a coagulation and mixing apparatus, and is stirred and mixed with the addition of a coagulant, followed by dehydration with a dehydration apparatus. The obtained dewatered sludge is carbonized in a carbonization furnace.
【０００４】[0004]
【発明が解決しようとする課題】前述した汚泥処理過程
において、エアレーションタンクから最終沈殿池に流入
する第２処理水中の活性汚泥は軽くて粒径が小さいた
め、沈降性が低くて処理時間が長くなる難点があり、処
理能力を向上するために最終沈殿池は大型化の傾向にあ
る。なお、第２処理水中に浮遊する微細汚泥やＣＯＤの
効率的な吸着を期待できず、処理水の水質を向上させ得
ない欠点も指摘される。In the above-described sludge treatment process, the activated sludge in the second treated water flowing into the final sedimentation tank from the aeration tank is light and has a small particle size, so that the settling property is low and the treatment time is long. The final settling basin tends to be large in order to improve the processing capacity. In addition, it is pointed out that it is not possible to expect efficient adsorption of fine sludge and COD floating in the second treated water, and it is not possible to improve the quality of treated water.
【０００５】また、前記濃縮槽に移送された余剰汚泥の
沈降性も低く、該濃縮槽での濃縮処理に時間が掛かる難
点がある。なお、濃縮槽で余剰汚泥から分離された脱離
液は、最初沈殿池に返送されて処理工程を循環するよう
になっており、微細汚泥の除除が不十分な場合には、最
初沈殿池での処理負荷およびエアレーションタンでの処
理負荷が増大する問題を招く。[0005] Further, there is also a problem that the sedimentation of the excess sludge transferred to the thickening tank is low, and it takes a long time for the thickening treatment in the thickening tank. The desorbed liquid separated from the excess sludge in the concentration tank is returned to the sedimentation basin first and circulates through the treatment process.If the removal of the fine sludge is insufficient, the first sedimentation basin is used. This causes a problem that the processing load of the aeration tan and the processing load of the aeration tan increase.
【０００６】[0006]
【発明の目的】この発明は、従来の技術に係る汚泥処理
方法に内在している前記欠点に鑑み、これを好適に解決
するべく提案されたものであって、炭化汚泥を汚水処理
過程での凝集助剤として用いることで、水質向上を図る
と共に濃縮槽や最終沈殿池での処理能力を向上させる炭
化汚泥を用いた汚泥処理方法を提供することを目的とす
る。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks inherent in the conventional sludge treatment method, and has been proposed in order to preferably solve the problem. It is an object of the present invention to provide a sludge treatment method using carbonized sludge which improves water quality and improves treatment capacity in a concentration tank or a final sedimentation basin by using as a coagulation aid.
【０００７】[0007]
【課題を解決するための手段】前記課題を克服し、初期
の目的を達成するため、本願の第１の発明に係る炭化汚
泥を用いた汚泥処理方法は、凝集混和装置に供給された
濃縮汚泥に凝集剤を添加したもとで攪拌混合してから脱
水装置で脱水し、得られた脱水汚泥を炭化炉装置で炭化
する汚泥処理方法において、前記炭化炉装置で得られた
炭化汚泥を、濃縮槽に余剰汚泥と同時に投入して攪拌混
合することで、余剰汚泥を炭化汚泥に混合付着させて沈
降濃縮させ、得られた濃縮汚泥を前記凝集混和装置に移
送して処理するようにしたことを特徴とする。Means for Solving the Problems In order to overcome the above-mentioned problems and to achieve the initial object, the sludge treatment method using carbonized sludge according to the first invention of the present application is a method for treating concentrated sludge supplied to a coagulation and mixing apparatus. In a sludge treatment method in which a coagulant is added and agitated and mixed and then dewatered with a dehydrator, and the obtained dewatered sludge is carbonized in a carbonization furnace, the carbonized sludge obtained in the carbonization furnace is concentrated. By adding the excess sludge to the tank simultaneously with stirring and mixing, the excess sludge is mixed and adhered to the carbonized sludge, settled and concentrated, and the obtained concentrated sludge is transferred to the coagulation and mixing apparatus for processing. Features.
【０００８】前記課題を克服し、初期の目的を達成する
ため、本願の第２の発明に係る炭化汚泥を用いた汚泥処
理方法は、凝集混和装置に供給された余剰汚泥に凝集剤
を添加したもとで攪拌混合してから脱水装置で脱水し、
得られた脱水汚泥を炭化炉装置で炭化する汚泥処理方法
において、前記炭化炉装置で得られた炭化汚泥を、最終
沈殿池の汚水流入側に投入して攪拌混合した汚水を最終
沈殿池へ流入させ、汚水中の汚泥を炭化汚泥に混合付着
させて沈降濃縮させ、得られた余剰汚泥を前記凝集混和
装置に移送して処理するようにしたことを特徴とする。[0008] In order to overcome the above-mentioned problems and achieve the initial object, the method for treating sludge using carbonized sludge according to the second invention of the present application comprises adding a flocculant to excess sludge supplied to a flocculation and mixing apparatus. After stirring and mixing, dehydrate with a dehydrator,
In the sludge treatment method in which the obtained dewatered sludge is carbonized in a carbonization furnace, the carbonized sludge obtained in the carbonization furnace is supplied to the wastewater inflow side of the final sedimentation basin, and the mixed and stirred sewage flows into the final sedimentation basin. Then, the sludge in the sewage is mixed and adhered to the carbonized sludge, settled and concentrated, and the obtained excess sludge is transferred to the coagulation and mixing apparatus for treatment.
【０００９】[0009]
【発明の実施の形態】次に、本発明に係る炭化汚泥を用
いた汚泥処理方法につき、好適な実施例を挙げて、添付
図面を参照しながら詳細に説明する。BEST MODE FOR CARRYING OUT THE INVENTION Next, a method for treating sludge using carbonized sludge according to the present invention will be described in detail with reference to the accompanying drawings with reference to preferred embodiments.
【００１０】[0010]
【第１実施例】図１は、請求項１に係る炭化汚泥を用い
た汚泥処理方法を好適に実施し得る第１実施例の汚泥処
理設備の概略構成を示すものであって、図示しない最初
沈殿池から砂およびし渣が除去された第１処理水(汚水)
が流入するエアレーションタンク１０は、連絡水路１２
を介して最終沈殿池１４に連通され、エアレーションタ
ンク１０内で形成された活性汚泥を含む第２処理水(汚
水)が最終沈殿池１４に連絡水路１２を介して流入する
よう構成される。この最終沈殿池１４の底部には汚泥掻
寄せ機１６が配設されており、底部に重力沈降した沈殿
汚泥を汚泥ピット１８に掻寄せ、この汚泥ピット１８内
の沈殿汚泥の一部を図示しない返送ポンプを介してエア
レーションタンク１０に返送するようになっている。ま
た、最終沈殿池１４は塩素混和池２０に連通し、最終沈
殿池１４の上澄水が塩素混和池２０で塩素消毒された後
に処理水として放流されるよう構成してある。First Embodiment FIG. 1 shows a schematic configuration of a sludge treatment facility according to a first embodiment capable of suitably performing the sludge treatment method using carbonized sludge according to the first embodiment. First treated water (sewage) from which sand and residue have been removed from the sedimentation basin
The aeration tank 10 into which the water flows in
The second treated water (sewage) including the activated sludge formed in the aeration tank 10 flows into the final sedimentation basin 14 through the communication water channel 12 through the communication port 12. A sludge scraper 16 is disposed at the bottom of the final sedimentation basin 14, and the settled sludge that has settled by gravity is scraped to the bottom of the sludge pit 18, and a part of the settled sludge in the sludge pit 18 is not shown. The air is returned to the aeration tank 10 via a return pump. The final sedimentation basin 14 is connected to a chlorine mixing pond 20, and the supernatant water of the final sedimentation pond 14 is configured to be disinfected with chlorine in the chlorine mixing pond 20 before being discharged as treated water.
【００１１】前記最終沈殿池１４の汚泥ピット１８に掻
寄せられてエアレーションタンク１０に返送されない残
りの余剰汚泥(沈殿汚泥)は、汚泥ピット１８に接続する
第１汚泥ポンプ２２を介して重力式の濃縮槽２４に移送
されるようになっている。この濃縮槽２４の内部に、上
下方向に開放する整流筒２６が配設されると共に、該整
流筒２６の内部には上方に開放する攪拌箱２８が配設さ
れ、前記第１汚泥ポンプ２２により移送される余剰汚泥
は攪拌箱２８に流入するよう構成される。また、濃縮槽
２４には投入装置３０が配設され、後述する炭化炉装置
４０から投入装置３０に供給された炭化汚泥を、前記攪
拌箱２８に投入し得るよう構成してある。なお投入装置
３０は、攪拌箱２８への余剰汚泥の流入量に比例した所
定量の炭化汚泥を投入し得るよう運転制御される。ま
た、濃縮槽２４で汚泥から分離された脱離水は、図示し
ない経路を介して最初沈殿池に返送されて処理工程を循
環するようになっている。The remaining excess sludge (settled sludge) which has been scraped by the sludge pit 18 of the final sedimentation basin 14 and is not returned to the aeration tank 10 is gravity-driven through a first sludge pump 22 connected to the sludge pit 18. It is to be transferred to the concentration tank 24. Inside the concentrating tank 24, a rectifying cylinder 26 that opens in the vertical direction is disposed, and inside the rectifying cylinder 26, a stirring box 28 that opens upward is disposed. The transferred excess sludge is configured to flow into the stirring box 28. Further, a charging device 30 is provided in the concentration tank 24, and is configured so that carbonized sludge supplied from the carbonizing furnace device 40 to the charging device 30 to be described later can be charged into the stirring box 28. The operation of the charging device 30 is controlled so that a predetermined amount of carbonized sludge that is proportional to the amount of surplus sludge flowing into the stirring box 28 can be charged. The desorbed water separated from the sludge in the concentration tank 24 is first returned to the sedimentation basin via a path (not shown) and circulates through the treatment process.
【００１２】前記濃縮槽２４の底部には第２汚泥ポンプ
３２が接続され、濃縮槽２４の底部に沈降濃縮した濃縮
汚泥(余剰汚泥が炭化汚泥に混合付着したもの)を、貯留
槽３４に移送して貯留させるよう構成される。この貯留
槽３４には凝集混和装置３６が接続され、貯留槽３４か
ら凝集混和装置３６に供給された濃縮汚泥に、有機系ま
たは無機系の凝集剤を添加したもとで攪拌混合すること
で凝集させるようになっている。更に、凝集混和装置３
６には脱水装置３８が接続され、凝集された汚泥を該脱
水装置３８で所要の含水率(例えば８０〜７０％)まで脱
水することで脱水汚泥を製造するよう構成される。A second sludge pump 32 is connected to the bottom of the thickening tank 24, and the concentrated sludge settled and concentrated at the bottom of the thickening tank 24 (surplus sludge mixed and adhered to the carbonized sludge) is transferred to a storage tank 34. To be stored. An aggregating / mixing device 36 is connected to the storage tank 34, and an organic or inorganic coagulant is added to the concentrated sludge supplied from the storage tank 34 to the aggregating / mixing device 36 to perform agitation and mixing. It is made to let. Further, the coagulation mixing device 3
A dewatering device 38 is connected to 6 and is configured to produce dewatered sludge by dewatering the aggregated sludge to a required moisture content (for example, 80 to 70%).
【００１３】前記脱水装置３８には炭化炉装置４０が接
続され、脱水装置３８から移送される脱水汚泥を加熱す
ることで炭化し、得られた炭化汚泥を土壌改良剤や融雪
剤等として使用し得るようになっている。また炭化炉装
置４０は、前記投入装置３０に接続され、炭化汚泥の一
部を濃縮槽２４における汚泥の凝集助剤として用いるよ
う構成される。The dewatering device 38 is connected to a carbonization furnace device 40. The dewatered sludge transferred from the dewatering device 38 is heated to be carbonized, and the obtained carbonized sludge is used as a soil improving agent, a snow melting agent and the like. I am getting it. Further, the carbonization furnace device 40 is connected to the charging device 30 and is configured to use a part of the carbonized sludge as a coagulation aid for the sludge in the concentration tank 24.
【００１４】[0014]
【第１実施例の作用】次に、前述した第１実施例に係る
汚泥処理設備の作用につき説明する。前記エアレーショ
ンタンク１０から最終沈殿池１４に連絡水路１２を介し
て流入した活性汚泥を含む第２処理水は、該池内で活性
汚泥が重力沈降し、前記汚泥掻寄せ機１６により汚泥ピ
ット１８に掻寄せられる。汚泥ピット１８の沈殿汚泥
は、その一部がエアレーションタンク１０に返送される
と共に、残りの余剰汚泥は第１汚泥ポンプ２２を介して
濃縮槽２４に配設されている攪拌箱２８の内部に移送さ
れる。このとき、前記炭化炉装置４０から投入装置３０
に供給される炭化汚泥が、余剰汚泥の流入量に比例して
攪拌箱２８に同時に供給される。余剰汚泥が攪拌箱２８
に流入した際に旋回流を起こし、これにより余剰汚泥と
炭化汚泥とが攪拌混合されつつ攪拌箱２８を上昇して整
流筒２６に入り、濃縮槽２４の底部に重力沈降して濃縮
する。Next, the operation of the sludge treatment equipment according to the first embodiment will be described. The second treated water containing the activated sludge flowing from the aeration tank 10 to the final sedimentation basin 14 via the communication channel 12 is subjected to gravity settling of the activated sludge in the pond, and the sludge scraper 16 scrapes the activated sludge into the sludge pit 18. Sent. A part of the settled sludge in the sludge pit 18 is returned to the aeration tank 10, and the remaining excess sludge is transferred via the first sludge pump 22 to the inside of the stirring box 28 provided in the concentration tank 24. Is done. At this time, the charging device 30 is
Is supplied simultaneously to the stirring box 28 in proportion to the inflow of the excess sludge. Excess sludge is in the stirrer box 28
A swirling flow is caused when the sludge flows into the tank, whereby the excess sludge and the carbonized sludge are stirred and mixed, and ascend the stirrer box 28 to enter the flow straightening cylinder 26 and sediment by gravity at the bottom of the concentration tank 24 to be concentrated.
【００１５】前記重力式の濃縮槽２４は、有機性余剰汚
泥に対して効率が悪く、沈降に時間を要し濃縮が進まな
いのが一般的な傾向であるが、第１実施例のように余剰
汚泥を炭化汚泥に混合付着させることで汚泥の粒径が大
きくなって沈降性が向上し、沈降濃縮を効率的に進行さ
せることができる。また、濃縮槽２４内に浮遊する微細
汚泥を炭化汚泥に吸着することができ、当該濃縮槽２４
で汚泥から分離された脱離水の汚濁負荷を軽減し得るか
ら、該脱離水が返送される最初沈殿池やエアレーション
タンク１０等の処理系統での負荷増大を抑制することが
できる。The gravity type concentration tank 24 generally has a poor efficiency with respect to organic excess sludge, requires a long time for sedimentation, and generally does not proceed with concentration. By mixing and attaching the excess sludge to the carbonized sludge, the particle size of the sludge is increased, the sedimentation property is improved, and the sedimentation and concentration can proceed efficiently. Further, the fine sludge floating in the concentration tank 24 can be adsorbed to the carbonized sludge, and
Thus, the pollution load of the desorbed water separated from the sludge can be reduced, so that an increase in the load in a treatment system such as the first settling tank or the aeration tank 10 where the desorbed water is returned can be suppressed.
【００１６】前記濃縮槽２４の濃縮汚泥は、第２汚泥ポ
ンプ３２を介して貯留槽３４に移送貯留され、次いで貯
留槽３４から凝集混和装置３６に供給された濃縮汚泥
に、凝集剤が添加されて攪拌混合された後に脱水装置３
８に移送されて脱水される。脱水装置３８で脱水される
汚泥には、炭化汚泥が混合されているから、脱水汚泥の
含水率を低減することができる。例えば、炭化汚泥の添
加率を乾燥汚泥重量当たり１０〜２０％とすることで、
脱水汚泥の含水率で２〜８％程度は低減される。The concentrated sludge in the concentration tank 24 is transferred and stored in a storage tank 34 via a second sludge pump 32, and then a flocculant is added to the concentrated sludge supplied from the storage tank 34 to a coagulation and mixing device 36. Dewatering device 3 after stirring and mixing
8 to be dehydrated. Since the sludge dewatered by the dewatering device 38 is mixed with the carbonized sludge, the water content of the dewatered sludge can be reduced. For example, by setting the addition rate of carbonized sludge to 10 to 20% per dry sludge weight,
The water content of the dewatered sludge is reduced by about 2 to 8%.
【００１７】そして、前記脱水装置３８で得られた脱水
汚泥は、前記炭化炉装置４０に移送されて加熱されるこ
とで炭化され、炭化汚泥が製造される。この炭化汚泥の
一部は、前記投入装置３０に供給されて処理工程を循環
する。また炭化汚泥の残りは、前述したように土壌改良
剤や融雪剤等としても利用される。なお、脱水汚泥の一
部は、用途に応じて炭化炉装置４０に移送されることな
く、処理系外に搬出される。The dewatered sludge obtained by the dewatering device 38 is transferred to the carbonization furnace device 40 and heated to be carbonized, thereby producing carbonized sludge. Part of the carbonized sludge is supplied to the charging device 30 and circulates through the treatment process. The remaining carbonized sludge is also used as a soil conditioner, a snow melting agent, and the like, as described above. In addition, a part of the dewatered sludge is carried out of the treatment system without being transferred to the carbonization furnace device 40 depending on the use.
【００１８】第１実施例において、前記濃縮槽２４への
炭化汚泥の添加方法としては、第１汚泥ポンプ２２によ
る余剰汚泥の移送路に炭化汚泥を注入添加する方法も採
用可能である。In the first embodiment, as a method of adding carbonized sludge to the thickening tank 24, a method of injecting and adding carbonized sludge to a transfer path of excess sludge by the first sludge pump 22 can be adopted.
【００１９】[0019]
【第２実施例】図２は、請求項２に係る炭化汚泥を用い
た汚泥処理方法を好適に実施し得る第２実施例の汚泥処
理設備の概略構成を示すものであって、基本的な構成は
第１実施例と同じであるので、異なる部分についてのみ
説明し、同一部分には同じ符号を付して示す。Second Embodiment FIG. 2 shows a schematic configuration of a sludge treatment facility according to a second embodiment capable of suitably performing the sludge treatment method using carbonized sludge according to the second embodiment. Since the configuration is the same as that of the first embodiment, only different portions will be described, and the same portions will be denoted by the same reference numerals.
【００２０】前記最終沈殿池１４の汚水流入側である連
絡水路１２に、炭化汚泥の投入装置４２が接続され、前
記炭化炉装置４０から供給された炭化汚泥を、該投入装
置４２により連絡水路１２を流れる第２処理水に投入す
るよう構成される。なお投入装置４２は、最終沈殿池１
４に流入する第２処理水の水量に比例した所定量の炭化
汚泥を投入し得るよう運転制御される。また連絡水路１
２には、機械式または曝気式の攪拌装置４４が設けら
れ、第２処理水中に含まれる活性汚泥と炭化汚泥とを攪
拌混合して混合付着させた後に、最終沈殿池１４に流入
させ得るよう構成してある。A connecting device 42 for carbonized sludge is connected to the communication channel 12 on the sewage inflow side of the final sedimentation basin 14, and carbonized sludge supplied from the carbonizing furnace device 40 is supplied to the communication channel 12 by the charging device 42. Into the second treated water flowing. The charging device 42 is used for the final settling basin 1
The operation is controlled so that a predetermined amount of carbonized sludge that is proportional to the amount of the second treated water flowing into 4 can be introduced. In addition, connection waterway 1
2 is provided with a mechanical or aeration type stirring device 44 so that activated sludge and carbonized sludge contained in the second treated water can be mixed and adhered by stirring and then flow into the final sedimentation basin 14. It is composed.
【００２１】また、前記最終沈殿池１４から第１汚泥ポ
ンプ２２を介して余剰汚泥が移送される濃縮槽２４に
は、その内部に整流筒２６のみが配設され、該整流筒２
６の内部に直に流入した余剰汚泥が、濃縮槽２４の底部
に重力沈降して濃縮されるようになっている。そして、
濃縮槽２４から第２汚泥ポンプ３２を介して貯留槽３４
へ移送された濃縮汚泥が、凝集混和装置３６を経て脱水
装置３８に至り、得られた脱水汚泥を炭化炉装置４０で
炭化して炭化汚泥を製造するよう構成される。また炭化
炉装置４０は、前記投入装置４２に接続され、炭化汚泥
の一部を最終沈殿池１４における汚泥の凝集助剤として
用いるようになっている。In a thickening tank 24 to which excess sludge is transferred from the final sedimentation tank 14 via a first sludge pump 22, only a rectifying cylinder 26 is provided.
The excess sludge that has flowed directly into 6 is gravity-sedimented to the bottom of the concentration tank 24 and concentrated. And
From the concentration tank 24 to the storage tank 34 via the second sludge pump 32
The condensed sludge transferred to the dewatering device reaches the dewatering device 38 via the coagulation and mixing device 36, and the obtained dewatered sludge is carbonized in the carbonization furnace device 40 to produce carbonized sludge. Further, the carbonization furnace device 40 is connected to the charging device 42, and uses a part of the carbonized sludge as a coagulation aid for the sludge in the final sedimentation basin 14.
【００２２】前記脱水装置３８には、無添加式コンポス
ト化装置４６が接続され、脱水装置３８で脱水された脱
水汚泥の一部が、該コンポスト化装置４６の醗酵槽(図
示せず)に投入されるよう構成される。この醗酵槽には
熟成コンポストが貯留されており、該コンポストと脱水
汚泥とを混合し、醗酵させてコンポスト化を行なうよう
になっている。なお、攪拌機内で予め熟成コンポストと
脱水汚泥とを攪拌混合した後に、醗酵槽に投入するよう
にしてもよい。A non-added composting device 46 is connected to the dewatering device 38, and a part of the dewatered sludge dewatered by the dewatering device 38 is supplied to a fermenter (not shown) of the composting device 46. It is configured to be. Aged compost is stored in this fermentation tank, and the compost and dehydrated sludge are mixed and fermented to be composted. The aging compost and the dewatered sludge may be stirred and mixed in advance in a stirrer and then charged into a fermentation tank.
【００２３】[0023]
【第２実施例の作用】次に、前述した第２実施例に係る
汚泥処理設備の作用につき説明する。前記エアレーショ
ンタンク１０から連絡水路１２に流入する第２処理水
に、前記炭化炉装置４０から投入装置４２に供給される
炭化汚泥が、第２処理水の流入量に比例して連絡水路１
２に投入される。そして、前記攪拌装置４４により第２
処理水中に含まれる活性汚泥と炭化汚泥とが攪拌混合さ
れた第２処理水が、前記最終沈殿池１４に流入する。Next, the operation of the sludge treatment equipment according to the second embodiment will be described. In the second treated water flowing from the aeration tank 10 into the communication water channel 12, the carbonized sludge supplied from the carbonization furnace device 40 to the charging device 42 is connected to the communication water channel 1 in proportion to the inflow amount of the second treated water.
It is thrown into 2. Then, the stirring device 44
The second treated water in which the activated sludge and the carbonized sludge contained in the treated water are stirred and mixed flows into the final sedimentation basin 14.
【００２４】前記最終沈殿池１４内においては、活性汚
泥が炭化汚泥に混合付着した状態で重力沈降し、底部に
堆積した沈殿汚泥が、汚泥掻寄せ機１６により汚泥ピッ
ト１８に掻寄せられる。最終沈殿池１４内を重力沈降す
る汚泥は、活性汚泥が炭化汚泥に混合付着して粒径が大
きくなっているので、その沈降性は向上して処理時間が
短かくなる。従って、最終沈殿池１４の小型化を図るこ
とができる。また炭化汚泥により、微細汚泥やＣＯＤの
効率的な吸着を期待でき、処理水の水質を向上させ得
る。In the final sedimentation basin 14, the activated sludge is settled by gravity in a state of being mixed and adhered to the carbonized sludge, and the settled sludge deposited on the bottom is scraped to the sludge pit 18 by the sludge scraper 16. Activated sludge is mixed with and adhered to carbonized sludge to increase the particle size of the sludge gravity-sedimented in the final sedimentation basin 14, so that the settling property is improved and the treatment time is shortened. Therefore, the size of the final sedimentation basin 14 can be reduced. In addition, carbonized sludge can be expected to efficiently absorb fine sludge and COD, and can improve the quality of treated water.
【００２５】前記汚泥ピット１８内における沈殿汚泥の
一部は、返送汚泥としてエアレーションタンク１０に返
送され、その返送時に生ずる旋回流により第１処理水と
攪拌混合されて微生物が付着し酸化を促進しつつ、再び
連絡水路１２を介して最終沈殿池１４に流入する循環を
繰返す。すなわち、返送汚泥に混合されている炭化汚泥
は、微生物、特に硝化菌などの生息場所となり、有機質
の酸化分解とアンモニヤ性窒素の硝化を助長し、同時に
微細汚泥やＢＯＤ、ＣＯＤを吸着することで、微細汚濁
負荷、ＢＯＤ、ＣＯＤ負荷の除去軽減を図り得る。A part of the settled sludge in the sludge pit 18 is returned to the aeration tank 10 as returned sludge, and is stirred and mixed with the first treated water by the swirling flow generated at the time of return, whereby microorganisms adhere and promote oxidation. Meanwhile, the circulation flowing into the final sedimentation basin 14 again through the connecting water channel 12 is repeated. In other words, carbonized sludge mixed with returned sludge becomes a habitat for microorganisms, especially nitrifying bacteria, and promotes oxidative decomposition of organic matter and nitrification of ammonia nitrogen, and at the same time adsorbs fine sludge, BOD, and COD. , Fine pollution load, BOD, COD load can be reduced.
【００２６】前記第１汚泥ポンプ２２により移送される
余剰汚泥は、前記濃縮槽２４の整流筒２６に流入し、該
濃縮槽２４の底部に重力沈降して濃縮する。この濃縮槽
２４に流入する余剰汚泥は、前述したように活性汚泥が
炭化汚泥に混合付着したものであるから粒径は大きく沈
降性が高いので、処理時間は短縮される。また炭化汚泥
が微細汚泥を吸着して脱離水の汚濁負荷を軽減し得るか
ら、該脱離水の返送に伴う処理系統への負荷増大を抑制
することができる。Excess sludge transferred by the first sludge pump 22 flows into the flow straightening column 26 of the thickening tank 24 and sediments by gravity at the bottom of the thickening tank 24 to be concentrated. As described above, the excess sludge flowing into the thickening tank 24 is obtained by mixing and adhering the activated sludge to the carbonized sludge, and has a large particle size and high sedimentation property, so that the treatment time is reduced. In addition, since the carbonized sludge can adsorb the fine sludge and reduce the pollution load of the desorbed water, it is possible to suppress an increase in the load on the treatment system due to the return of the desorbed water.
【００２７】前記濃縮槽２４の濃縮汚泥は、前述したと
同様に、第２汚泥ポンプ３２→貯留槽３４→凝集混和装
置３６→脱水装置３８を経て脱水汚泥とされ、該脱水汚
泥が炭化炉装置４０において炭化され、得られた一部の
炭化汚泥が前記投入装置４２に供給される循環を繰返
す。また、脱水汚泥の一部は、前記無添加式コンポスト
化装置４６の醗酵槽に投入され、熟成コンポストと混合
し、醗酵させてコンポスト化が行なわれる。脱水汚泥に
は炭化汚泥が混合されているから、該脱水汚泥の性状は
通気性が良好で粘着性が低くなると云う、コンポスト化
に有利な条件を備えており、コンポスト化が容易となる
利点がある。In the same manner as described above, the concentrated sludge in the thickening tank 24 is converted into dehydrated sludge through the second sludge pump 32 → the storage tank 34 → the coagulation / mixing device 36 → the dewatering device 38. A part of the carbonized sludge obtained by carbonization at 40 is repeatedly supplied to the input device 42 to repeat the circulation. A part of the dewatered sludge is put into a fermentation tank of the non-addition type composting apparatus 46, mixed with aged compost, and fermented to be composted. Since carbonized sludge is mixed in the dewatered sludge, the properties of the dewatered sludge have favorable conditions for composting, such as good air permeability and low adhesiveness, and there is an advantage that composting becomes easy. is there.
【００２８】なお、第２実施例のように最終沈殿池１４
に流入する第２処理水(汚水)に炭化汚泥を投入する場合
では、該沈殿池１４において沈降した沈殿汚泥には炭化
汚泥が混合して充分に濃縮されているので、余剰汚泥を
濃縮槽２４を介することなく直に貯留槽３４に移送する
ようにすることができ、濃縮槽２４を省略して設備の簡
素化を図り得る。It should be noted that, as in the second embodiment, the final sedimentation basin 14
When the carbonized sludge is introduced into the second treated water (sewage) flowing into the sedimentation tank 14, the precipitated sludge settled in the sedimentation basin 14 is sufficiently mixed with the carbonized sludge. Can be directly transferred to the storage tank 34 without any intermediary, and the equipment can be simplified by omitting the concentration tank 24.
【００２９】前述した各実施例において、濃縮槽または
連絡水路に投入される炭化汚泥については、炭化炉装置
で得られた炭化汚泥をより細かく破砕して粉末状態とす
ることが、より好ましい。また凝集混合装置において添
加される凝集剤として、炭化炉装置で得られた炭化汚泥
を用いるようにしてもよい。In each of the above-mentioned embodiments, it is more preferable that the carbonized sludge fed into the concentration tank or the connecting water channel is finely crushed into the powdered state by the carbonized sludge obtained by the carbonizing furnace. Moreover, you may make it use the carbonized sludge obtained by the carbonization furnace apparatus as a coagulant added in a coagulation mixing apparatus.
【００３０】[0030]
【発明の効果】以上に説明した如く、請求項１に係る発
明の炭化汚泥を用いた汚泥処理方法によれば、炭化汚泥
を濃縮槽に余剰汚泥と共に投入することにより、当該濃
縮槽での汚泥の沈降濃縮の促進を図り、処理時間を短縮
することができる。また、微細汚泥を炭化汚泥に吸着し
て脱離水の汚濁負荷を軽減し得ると共に、脱水工程での
脱水性能を向上し得る。As described above, according to the sludge treatment method using carbonized sludge according to the first aspect of the present invention, the sludge in the concentration tank is supplied by charging the carbonized sludge together with the excess sludge into the concentration tank. The sedimentation / concentration of water can be promoted, and the processing time can be shortened. In addition, the fine sludge can be adsorbed on the carbonized sludge to reduce the pollutant load of the desorbed water, and the dewatering performance in the dewatering step can be improved.
【００３１】また請求項２に係る発明の炭化汚泥を用い
た汚泥処理方法によれば、最終沈殿池に流入する汚水に
炭化汚泥を投入することにより、最終沈殿池での汚泥の
沈降濃縮の促進を図り、処理時間を短縮することができ
る。従って、最終沈殿池を小型化することが可能とな
る。更に、微細汚泥やＣＯＤを炭化汚泥に吸着すること
で、微細汚濁負荷やＣＯＤ負荷の除去軽減を図り得ると
共に、処理水の効率的な清澄化が達成される。なお、濃
縮槽での処理時間の短縮や、脱水工程での脱水性能の向
上および脱水汚泥の性状改善も可能となる。According to the sludge treatment method using carbonized sludge according to the second aspect of the present invention, the carbonized sludge is introduced into the sewage flowing into the final sedimentation basin to promote the sedimentation and concentration of the sludge in the final sedimentation basin. And the processing time can be shortened. Therefore, it is possible to reduce the size of the final sedimentation basin. Furthermore, by adsorbing the fine sludge and COD on the carbonized sludge, the removal of the fine pollutant load and the COD load can be reduced, and the efficient clarification of the treated water can be achieved. In addition, it becomes possible to shorten the treatment time in the concentration tank, improve the dewatering performance in the dewatering step, and improve the properties of the dewatered sludge.
【図１】本発明の好適な第１実施例に係る汚泥処理設備
の概略構成図である。FIG. 1 is a schematic configuration diagram of a sludge treatment facility according to a first preferred embodiment of the present invention.
【図２】本発明の好適な第２実施例に係る汚泥処理設備
の概略構成図である。FIG. 2 is a schematic configuration diagram of a sludge treatment facility according to a second preferred embodiment of the present invention.
１４ 最終沈殿池 ２４ 濃縮槽 ３６ 凝集混和装置 ３８ 脱水装置 ４０ 炭化炉装置 14 Final sedimentation basin 24 Concentration tank 36 Coagulation mixing device 38 Dehydration device 40 Carbonization furnace device
───────────────────────────────────────────────────── フロントページの続き (72)発明者 土屋 實 千葉県船橋市二和西３−12−16 (72)発明者 大野 幹彦 岐阜県本巣郡北方町北方1717 (72)発明者 北林 誠 愛知県海部郡大治町西條七反田22−２ Ｆターム(参考） 4D059 AA03 AA05 BB02 BE31 BE54 BE55 CA22 CA24 CA28 CB08 4G066 AA04B CA56 DA15 FA23 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Minoru Tsuchiya 3-12-16 Futawanishi, Funabashi-shi, Chiba Pref. 22-2 Saijo Nanata, Oji-machi, Kaifu-gun F term (reference) 4D059 AA03 AA05 BB02 BE31 BE54 BE55 CA22 CA24 CA28 CB08 4G066 AA04B CA56 DA15 FA23
Claims (2)
に凝集剤を添加したもとで攪拌混合してから脱水装置(3
8)で脱水し、得られた脱水汚泥を炭化炉装置(40)で炭化
する汚泥処理方法において、 前記炭化炉装置(40)で得られた炭化汚泥を、濃縮槽(24)
に余剰汚泥と同時に投入して攪拌混合することで、余剰
汚泥を炭化汚泥に混合付着させて沈降濃縮させ、得られ
た濃縮汚泥を前記凝集混和装置(36)に移送して処理する
ようにしたことを特徴とする炭化汚泥を用いた汚泥処理
方法。The concentrated sludge supplied to the coagulation and mixing device (36) is stirred and mixed with a coagulant added thereto.
8) In the sludge treatment method of carbonizing the dehydrated sludge obtained in the carbonization furnace device (40), the carbonized sludge obtained in the carbonization furnace device (40), the concentration tank (24)
By adding and mixing the excess sludge at the same time with stirring and mixing, the excess sludge is mixed and adhered to the carbonized sludge, settled and concentrated, and the obtained concentrated sludge is transferred to the coagulation mixing apparatus (36) for processing. A sludge treatment method using carbonized sludge, characterized in that:
に凝集剤を添加したもとで攪拌混合してから脱水装置(3
8)で脱水し、得られた脱水汚泥を炭化炉装置(40)で炭化
する汚泥処理方法において、 前記炭化炉装置(40)で得られた炭化汚泥を、最終沈殿池
(14)の汚水流入側に投入して攪拌混合した汚水を最終沈
殿池(14)へ流入させ、汚水中の汚泥を炭化汚泥に混合付
着させて沈降濃縮させ、得られた余剰汚泥を前記凝集混
和装置(36)に移送して処理するようにしたことを特徴と
する炭化汚泥を用いた汚泥処理方法。2. Excessive sludge supplied to the coagulation / mixing device (36) is stirred and mixed with a coagulant added thereto, and then mixed with the dewatering device (3).
8) In the sludge treatment method of carbonizing the dewatered sludge obtained in the carbonization furnace device (40), the carbonized sludge obtained in the carbonization furnace device (40), the final settling tank
(14) The sewage thrown into the sewage inflow side and stirred and mixed is allowed to flow into the final sedimentation basin (14), and the sludge in the sewage is mixed and adhered to the carbonized sludge, settled and concentrated, and the obtained excess sludge is coagulated. A sludge treatment method using carbonized sludge, wherein the sludge treatment is carried out by transferring to a mixing device (36).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008080252A (en) * | 2006-09-27 | 2008-04-10 | Nikkan Tokushu Kk | Apparatus and method for volume-reducing and carbonizing sludge and system for treating organic waste water |
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