JP2001113300A - Method and apparatus for treating organic waste water - Google Patents
Method and apparatus for treating organic waste waterInfo
- Publication number
- JP2001113300A JP2001113300A JP29390799A JP29390799A JP2001113300A JP 2001113300 A JP2001113300 A JP 2001113300A JP 29390799 A JP29390799 A JP 29390799A JP 29390799 A JP29390799 A JP 29390799A JP 2001113300 A JP2001113300 A JP 2001113300A
- Authority
- JP
- Japan
- Prior art keywords
- liquid separation
- solid
- sludge
- organic wastewater
- separation tank
- 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
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- 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
-
- 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
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
-
- 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
- Y02W10/40—Valorisation of by-products of wastewater, sewage or sludge processing
Landscapes
- Treatment Of Sludge (AREA)
- Activated Sludge Processes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下水処理場や各種
廃水処理施設等において有機性廃水を処理する方法に係
わり、更に詳しくは、下水、し尿、産業廃水などの有機
物、窒素、リンを含有する廃水を、活性汚泥法に代表さ
れる微生物の生物代謝反応を利用した廃水処理方法を介
して処理するシステムにおいて、省エネルギー化、有用
物質の回収とその資源化を考慮した有機性廃水の処理方
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 organic wastewater in a sewage treatment plant or various wastewater treatment facilities, and more particularly to a method for treating organic wastewater such as sewage, human waste, and industrial wastewater, containing nitrogen and phosphorus. Of wastewater from wastewater through a wastewater treatment method utilizing the biological metabolic reaction of microorganisms represented by the activated sludge method, the method of treating organic wastewater in consideration of energy saving, recovery of useful substances, and resource utilization It is about.
【０００２】[0002]
【従来の技術】従来の有機性廃水の処理方法において、
例えば活性汚泥法に嫌気性消化処理、好気性消化処理、
硝化脱窒処理、凝集処理、膜分離処理、脱水処理、焼却
処理、ＭＡＰ処理、オゾン処理、活性炭処理等を組み合
わせた方法では、処理プラントの建設費、ランニングコ
スト、環境に対する影響等を総合的に考慮したシステム
は、非常に少なかった。2. Description of the Related Art In a conventional method for treating organic wastewater,
For example, anaerobic digestion treatment, aerobic digestion treatment,
In a method combining nitrification denitrification, coagulation, membrane separation, dehydration, incineration, MAP, ozone, activated carbon, etc., the construction cost, running cost, and environmental impact of the treatment plant are comprehensively evaluated. Very few systems were considered.
【０００３】[0003]
【発明が解決しようとする課題】すなわち、従来の有機
性廃水の処理方法においては、非常に大きな建設費を費
やして嫌気性消化処理、膜分離処理、焼却処理等を行っ
たり、非常に大きなエネルギーを消費して好気性消化、
オゾン処理、膜分離処理、焼却処理等を行ったり、非常
に大きな薬品コストをかけて凝集処理、脱水処理、ＭＡ
Ｐ処理、活性炭処理等を行ったりする場合が多かった。
このように、従来の有機性廃水の処理方法は、省エネル
ギー的にも、ランニングコスト的にも大きな問題点があ
った。That is, in the conventional method for treating organic wastewater, anaerobic digestion treatment, membrane separation treatment, incineration treatment, etc. are performed at a very large construction cost, and very large energy is consumed. Consumes aerobic digestion,
Perform ozone treatment, membrane separation treatment, incineration treatment, etc., or coagulation treatment, dehydration treatment, MA
In many cases, P treatment, activated carbon treatment, or the like was performed.
As described above, the conventional method for treating organic wastewater has significant problems in terms of energy saving and running cost.
【０００４】本発明は、上述した従来技術の問題点を解
決することを目的とする。すなわち、有機性廃水処理シ
ステムの中で、特に有機物、窒素、リンを含有する廃水
を、活性汚泥法に代表される微生物の生物代謝反応を利
用した廃水処理方法を介して処理するシステムにおい
て、排水中の処理対象成分の形態とその特性をできるだ
け生かした処理フローを構成することで、省エネルギー
化、有用物質の回収とその資源化を考慮した廃水処理方
法を提供することを課題とする。An object of the present invention is to solve the above-mentioned problems of the prior art. That is, in an organic wastewater treatment system, in particular, a system for treating wastewater containing organic matter, nitrogen, and phosphorus through a wastewater treatment method utilizing a biological metabolic reaction of microorganisms represented by an activated sludge method, It is an object of the present invention to provide a wastewater treatment method that considers energy saving, recovery of useful substances, and recycling of resources by configuring a treatment flow that makes the best use of the form and characteristics of the components to be treated.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、上記課題
を解決するために、廃水中の処理対象成分の形態とその
特性について検討を行い、最初固液分離槽（最初沈殿池
を含む）において分離した初沈汚泥またはその濃縮汚泥
（総称して「汚泥」という）は、炭水化物が多く、特に
脱水性がよい、すなわち、焼却に適していることを見出
した。また、最終固液分離槽（最終沈殿池を含む）にお
いて分離した余剰汚泥またはその濃縮汚泥は、リン、窒
素が多く、また、脱水性が悪く、すなわち、リン酸マグ
ネシウムアンモニウム（ＭＡＰ）処理に適していること
を見出した。本発明は、このような知見に基づいてなさ
れたものであり、次の構成からなるものである。Means for Solving the Problems In order to solve the above-mentioned problems, the present inventors have studied the form and characteristics of the components to be treated in wastewater, and have first studied a solid-liquid separation tank (including a first settling tank). The primary sludge or its concentrated sludge (collectively referred to as “sludge”) separated in (1) contains a large amount of carbohydrates and has particularly good dewaterability, that is, is suitable for incineration. The excess sludge separated in the final solid-liquid separation tank (including the final sedimentation basin) or its concentrated sludge has a large amount of phosphorus and nitrogen, and has poor dehydration properties, that is, suitable for magnesium ammonium phosphate (MAP) treatment. I found that. The present invention has been made based on such knowledge, and has the following configuration.
【０００６】上記課題を解決するために、本発明では以
下に示す基本処理フローからなる有機性廃水の処理方法
を提供するものである。 （１）最初固液分離槽、活性汚泥が浮遊する生物反応
槽、最終固液分離槽の３種類の槽工程を含む有機性廃水
の処理方法において、最初固液分離槽において分離した
汚泥を脱水装置により脱水処理し、脱水ケーキをケーキ
燃焼工程において燃焼し、また、最終固液分離槽におい
て分離した汚泥を嫌気性醗酵工程において消化し、前記
嫌気性醗酵工程で生成する消化汚泥から、リン酸マグネ
シウムアンモニウムの形態でリンと窒素を回収すること
を特徴とする有機性廃水の処理方法。In order to solve the above problems, the present invention provides a method for treating organic wastewater comprising the following basic treatment flow. (1) In a method of treating organic wastewater including three types of tank processes: a first solid-liquid separation tank, a biological reaction tank in which activated sludge floats, and a final solid-liquid separation tank, the sludge separated in the first solid-liquid separation tank is dewatered. The dewatered cake is dewatered by the apparatus, the dewatered cake is burned in the cake burning process, and the sludge separated in the final solid-liquid separation tank is digested in the anaerobic fermentation process. A method for treating organic wastewater, comprising recovering phosphorus and nitrogen in the form of magnesium ammonium.
【０００７】（２）前記有機性廃水が活性汚泥が浮遊す
る生物反応槽に流入する工程の前に、最初固液分離槽の
分離水中に残存する懸濁成分を分離する中間固液分離工
程を設け、かつ、前記中間固液分離工程において分離し
た汚泥を、脱水装置により脱水する工程を含むことを特
徴とする前記（１）記載の有機性廃水の処理方法。 （３）前記中間固液分離工程において、懸濁成分を分離
するために、濾過体の濾過作用を利用する分離方法、ま
たは凝集剤添加による凝集沈殿分離方法のうちの少なく
とも一つの方法を採用することを特徴とする前記（１）
または（２）記載の有機性廃水の処理方法。 （４）前記ケーキ燃焼工程、または前記中間固液分離工
程において分離した汚泥を脱水処理した脱水ケーキを燃
焼するケーキ燃焼工程において発生するエネルギーを回
収する燃焼エネルギー回収工程、前記嫌気性醗酵工程で
生成するメタンガス等を回収するメタンガス回収工程の
うちの少なくとも一つの工程を含むことを特徴とする前
記（１）〜（３）のいずれか１項記載の有機性廃水の処
理方法。(2) Before the step of flowing the organic wastewater into the biological reaction tank in which the activated sludge floats, an intermediate solid-liquid separation step of first separating suspended components remaining in the separation water in the solid-liquid separation tank is performed. The method for treating organic wastewater according to (1), further comprising a step of dehydrating the sludge separated in the intermediate solid-liquid separation step by a dehydrator. (3) In the intermediate solid-liquid separation step, in order to separate suspended components, at least one of a separation method using a filtration action of a filter and a coagulation sedimentation separation method by adding a coagulant is adopted. (1) characterized in that:
Or the method for treating organic wastewater according to (2). (4) a combustion energy recovery step of recovering energy generated in a cake combustion step of burning a dewatered cake obtained by dewatering sludge separated in the cake combustion step or the intermediate solid-liquid separation step, and a anaerobic fermentation step. The method for treating organic wastewater according to any one of (1) to (3), further including at least one of methane gas recovery steps of recovering methane gas or the like.
【０００８】（５）最初固液分離槽、活性汚泥が浮遊す
る生物反応槽、最終固液分離槽の３種類の槽を含む有機
性廃水の処理装置において、最初固液分離槽にそこで分
離した汚泥を脱水処理する脱水装置を接続して設け、前
記脱水装置にその脱水ケーキを送るケーキ燃焼装置を接
続し、最終固液分離槽にそこで分離した汚泥を消化し、
そこで生成する消化汚泥から、リン酸マグネシウムアン
モニウムの形態でリンと窒素を回収する嫌気性醗酵装置
を接続して設けたことを特徴とする有機性廃水の処理装
置。なお、ここでいう「最初固液分離槽」とは、生物反
応前に設置され、また「最終固液分離槽」とは生物反応
後に設置されているもののことであり、最初固液分離槽
の前後及び最終固液分離槽の前後に補助的な固液分離槽
が存在してもよく、例えば最初固液分離槽の後に「中間
固液分離槽」を設けることができる。また、「固液分離
槽」は槽状のものに限定されず、「沈殿池」のようなも
のも含む。(5) In an organic wastewater treatment apparatus including three types of tanks: a solid-liquid separation tank, a biological reaction tank in which activated sludge floats, and a final solid-liquid separation tank, the solid waste is first separated there. A dewatering device for dewatering the sludge is connected and provided, a cake combustion device for sending the dewatered cake is connected to the dewatering device, and the sludge separated there is digested in a final solid-liquid separation tank,
An organic wastewater treatment apparatus, which is provided with an anaerobic fermentation apparatus connected to recover phosphorus and nitrogen in the form of magnesium ammonium phosphate from digested sludge generated therefrom. The “first solid-liquid separation tank” here is installed before the biological reaction, and the “final solid-liquid separation tank” is installed after the biological reaction. An auxiliary solid-liquid separation tank may be present before and after and before and after the final solid-liquid separation tank. For example, an “intermediate solid-liquid separation tank” may be provided after the first solid-liquid separation tank. Further, the “solid-liquid separation tank” is not limited to a tank-shaped tank, but also includes a “sedimentation tank”.
【０００９】[0009]
【発明の実施の形態】以下に、本発明の実施態様を図面
に基づいて詳細に説明する。すなわち、本発明の第１の
態様では、最初固液分離槽１、活性汚泥が浮遊する生物
反応槽２、最終固液分離槽３の３種類の槽工程を含む有
機性廃水処理システムにおいて、最初固液分離槽１にお
いて分離した初沈汚泥またはその濃縮汚泥１１、すなわ
ち脱水性が比較的良く、高カロリーで、窒素とリンの含
有率が低いＳＳ成分を、脱水装置４により脱水処理する
ことで、水処理系から多量の有機成分を取り除き、脱水
ケーキをケーキ燃焼工程７において燃焼し、また、最終
固液分離槽３において分離した余剰汚泥またはその濃縮
汚泥３１、すなわち脱水性が比較的悪く、低カロリー
で、窒素とリンの含有率が高い成分を、嫌気性醗酵工程
５において消化し、嫌気性醗酵工程５で生成する消化汚
泥５１、すなわち高濃度の窒素、リン及びアルカリ成分
を含有する成分からリン酸マグネシウムアンモニアムの
形態でリンと窒素を回収するというものである。Embodiments of the present invention will be described below in detail with reference to the drawings. That is, in the first embodiment of the present invention, in an organic wastewater treatment system including three types of tank processes, a solid-liquid separation tank 1, a biological reaction tank 2 in which activated sludge floats, and a final solid-liquid separation tank 3, The primary sludge or the concentrated sludge 11 separated in the solid-liquid separation tank 1, that is, the SS component having relatively good dehydration, high calorie, and low nitrogen and phosphorus content is dehydrated by the dehydrator 4. A large amount of organic components are removed from the water treatment system, the dewatered cake is burned in the cake burning step 7, and the excess sludge separated in the final solid-liquid separation tank 3 or its concentrated sludge 31, that is, the dewaterability is relatively poor, A low-calorie component having a high content of nitrogen and phosphorus is digested in the anaerobic fermentation step 5, and the digested sludge 51 produced in the anaerobic fermentation step 5, ie, a high concentration of nitrogen, phosphorus and alkali Is that the recovery of phosphorus and nitrogen in the form of magnesium phosphate ammonia beam from a component containing component.
【００１０】また、第２の態様では、有機性廃水が活性
汚泥が浮遊する生物反応槽２に流入する工程の前に、最
初固液分離槽１の分離水中に残存する懸濁成分を分離す
る中間固液分離工程６を設け、かつ、中間固液分離工程
６において分離した中間汚泥またはその濃縮汚泥６１
を、脱水装置４により脱水する工程を含むことにより、
カロリーが高く、脱水性の良いＳＳ性有機物をより多く
水処理系外に分離することができる。また、第３の態様
では、中間固液分離工程６において、濾過体の濾過作用
を利用する分離方法、または凝集剤添加による凝集沈降
分離方法の内、少なくとも１方法を採用することによ
り、カロリーが高く、脱水性の良いＳＳ性有機物を、更
に効率的に水処理系外に分離することができる。In the second embodiment, before the step of flowing the organic wastewater into the biological reaction tank 2 in which the activated sludge floats, first, the suspended components remaining in the separated water in the solid-liquid separation tank 1 are separated. An intermediate solid-liquid separation step 6 is provided, and the intermediate sludge or the concentrated sludge 61 separated in the intermediate solid-liquid separation step 6 is provided.
Comprises a step of dehydrating with a dehydrating device 4,
The SS organic matter having a high calorie and good dehydration can be separated out of the water treatment system. Further, in the third aspect, in the intermediate solid-liquid separation step 6, calorie is reduced by employing at least one of a separation method utilizing a filtration action of a filter and a coagulation sedimentation separation method by adding a coagulant. Highly SS organic matter having good dehydration properties can be separated out of the water treatment system more efficiently.
【００１１】また、第４の態様では、脱水装置４により
脱水処理した初沈汚泥またはその濃縮汚泥１１、または
中間汚泥またはその濃縮汚泥６１の脱水ケーキを燃焼さ
せるケーキ燃焼工程７、ケーキ燃焼工程７において発生
するエネルギーを回収する燃焼エネルギー回収工程８、
嫌気性醗酵工程５で生成するメタンガス等を回収するメ
タンガス回収工程９の内少なくとも１つの工程を含むこ
とにより、プラントのエネルギー消費量の軽減化がより
効率的に図るものである。In the fourth embodiment, a cake burning step 7 and a cake burning step 7 for burning a dewatered cake of primary sludge or its concentrated sludge 11 or intermediate sludge or its concentrated sludge 61 dehydrated by the dewatering device 4. Combustion energy recovery process 8 for recovering energy generated in
By including at least one of the methane gas recovery processes 9 for recovering methane gas and the like generated in the anaerobic fermentation process 5, the energy consumption of the plant can be reduced more efficiently.
【００１２】[0012]
【実施例】次に、本発明を実際に組み込んだ実験プラン
トの運転結果の一例について詳細に説明する。ただし、
本発明はこの実施例により何等制限されるものではな
い。Next, an example of operation results of an experimental plant in which the present invention is actually incorporated will be described in detail. However,
The present invention is not limited by this embodiment.
【００１３】実施例１ 図１に実験プラントのフローを示す。この例では、原水
として実際の下水処理場に流入する有機性汚水を使用し
た。ＢＯＤ：２００ｍｇ／リットル、ＳＳ：１８０ｍｇ
／リットルの水質の有機性汚水を９００ｍ3 ／ｄの流量
で流入させ、最初固液分離槽１で初沈汚泥を沈殿分離し
て濃縮汚泥１１とし、中間固液分離工程６を通して生物
反応槽２に入れて生物的反応を行わせ、その液を最終固
液分離槽３に送り活性汚泥を沈殿させ、上澄み水を処理
水として取り出し、ＢＯＤ：２０ｍｇ／リットル、Ｓ
Ｓ：１０ｍｇ／リットルの水質の処理水を得た。前記の
中間固液分離工程６はＦｅ系の凝集剤を使用し、さらに
不織布により濾過を行う機能を持つ装置とした。最初固
液分離槽１で、固形物濃度４％の濃縮汚泥１１が２０ｍ
3 ／ｄの量で得られ、中間固液分離工程６で、固形物濃
度２％の濃縮汚泥６１が４０ｍ3 ／ｄの量で得られ、さ
らに最終固液分離槽３で、固形物濃度１．５％の濃縮汚
泥３１が３．５ｍ3 ／ｄの量で得られた。Embodiment 1 FIG. 1 shows the flow of an experimental plant. In this example, organic wastewater flowing into an actual sewage treatment plant was used as raw water. BOD: 200 mg / liter, SS: 180 mg
/ L of organic wastewater of water quality at a flow rate of 900 m 3 / d, first settled sludge is separated and separated into concentrated sludge 11 in the solid-liquid separation tank 1, and the biological reaction tank 2 is passed through the intermediate solid-liquid separation step 6. To cause a biological reaction, and the liquid is sent to the final solid-liquid separation tank 3 to precipitate activated sludge, and the supernatant water is taken out as treated water. BOD: 20 mg / liter, S
S: A treated water having a water quality of 10 mg / liter was obtained. In the intermediate solid-liquid separation step 6, an apparatus using an Fe-based flocculant and having a function of filtering with a nonwoven fabric was used. First, in the solid-liquid separation tank 1, the concentrated sludge 11 having a solid concentration of 4% is 20 m
3 / d, and in the intermediate solid-liquid separation step 6, concentrated sludge 61 having a solid concentration of 2% was obtained in an amount of 40 m 3 / d. 0.5% of concentrated sludge 31 was obtained in an amount of 3.5 m 3 / d.
【００１４】脱水装置４はスクリュープレス型の脱水機
を使用した。前記濃縮汚泥１１及び濃縮汚泥６１を脱水
装置４に送って脱水し、含水率６５％の脱水ケーキ４．
５ｍ 3 ／ｄ（４．５ｔ／ｄ）を得て、それをケーキ燃焼
工程７に送って燃焼させる。この燃焼で発生する熱は燃
焼エネルギー回収工程８で回収するが、その熱量は８．
４×１０8 Ｊ／ｄ（２００Ｍｃａｌ／ｄ）である。一
方、最終固液分離槽３で沈殿した汚泥を濃縮して得た濃
縮汚泥３１は嫌気性醗酵工程５へ送る。嫌気性醗酵工程
５では、ケーキ燃焼工程７において発生したエネルギー
の一部と嫌気性醗酵工程５から回収したメタンガスの発
熱エネルギーを利用して、９０℃に加温して嫌気性消化
を行った。メタンガスの発生量は５０ｍ3 ／ｄであり、
発生熱は１．８×１０9 Ｊ／ｄ（４３０Ｍｃａｌ／ｄ）
である。また、嫌気性醗酵工程５において、水酸化マグ
ネシウム、及び数種類の添加剤を使用することによりリ
ン酸マグネシウムアンモニウム（ＭＡＰ）を生成させ
た。その生成量はＭｇＮＨ4 ＰＯ4 ・６Ｈ2 Ｏとして２
５ｋｇ／ｄであった。The dehydrator 4 is a screw press type dehydrator.
It was used. The concentrated sludge 11 and the concentrated sludge 61 are dewatered.
3. Dehydration cake which is sent to the apparatus 4 and dehydrated and has a water content of 65%
5m Three/ D (4.5 t / d) and burn it with cake
Send to Step 7 for combustion. The heat generated by this combustion is
The energy is recovered in the burning energy recovery step 8, and the amount of heat is 8.
4 × 108J / d (200 Mcal / d). one
On the other hand, the sludge precipitated in the final solid-liquid separation tank 3 is
The condensed sludge 31 is sent to the anaerobic fermentation step 5. Anaerobic fermentation process
In 5, the energy generated in the cake burning process 7
Of methane gas recovered from part of anaerobic fermentation process 5
Anaerobic digestion by heating to 90 ° C using thermal energy
Was done. Methane gas generation is 50mThree/ D,
Generated heat is 1.8 × 109J / d (430 Mcal / d)
It is. Further, in the anaerobic fermentation step 5, the hydroxide mag
By using nesium and several additives,
Magnesium ammonium phosphate (MAP)
Was. The production amount is MgNHFourPOFour・ 6HTwo2 as O
It was 5 kg / d.
【００１５】[0015]
【発明の効果】本発明によれば、有機性廃水処理システ
ムの中で、特に有機物、窒素、リンを含有する廃水を、
活性汚泥法に代表される微生物の生物代謝反応を利用し
た排水処理方法を介して処理するシステムにおいて、最
初沈殿で生成する汚泥は、炭水化物が多くて脱水性がよ
く、焼却に適しているので、汚泥の脱水と焼却が容易に
行われ、また最終沈殿で生成する汚泥は、リン、窒素を
多く含み、脱水性がよくないので、脱水することなく、
嫌気性醗酵工程で消化させ、減量化して、その消化汚泥
からリン、窒素を得ているので、リン、窒素の取得が容
易になった。本発明によれば、処理の困難な最終沈殿で
生成する汚泥は、嫌気性醗酵工程により減量化すること
ができ、脱水性がよい最初沈殿で生成する汚泥から脱水
ケーキを得て、そのケーキの燃焼熱を前記の嫌気性醗酵
工程に利用できて、総合的な関係を形成することができ
る。According to the present invention, in an organic wastewater treatment system, a wastewater containing organic matter, nitrogen, and phosphorus is used.
In a system that processes wastewater using a metabolic reaction of microorganisms represented by the activated sludge process, the sludge generated in the first settling is rich in carbohydrates, has good dehydration properties, and is suitable for incineration. Dewatering and incineration of sludge are easily performed, and sludge generated in the final sediment contains a lot of phosphorus and nitrogen and has poor dewatering properties.
Since phosphorus and nitrogen are obtained by digesting and reducing the amount of the digested sludge in the anaerobic fermentation process, it is easy to obtain phosphorus and nitrogen. According to the present invention, sludge generated in the final sediment, which is difficult to treat, can be reduced by the anaerobic fermentation step, and a dewatered cake is obtained from the sludge generated in the first sediment, which has good dewaterability, and the cake is obtained. The heat of combustion can be used in the anaerobic fermentation process described above to form an overall relationship.
【図１】本発明の有機性廃水の処理方法を示すブロック
図である。FIG. 1 is a block diagram showing a method for treating organic wastewater of the present invention.
１ 最初固液分離槽 ２ 生物反応槽 ３ 最終固液分離槽 ４ 脱水装置 ５ 嫌気性醗酵工程 ６ 中間固液分離工程 ７ ケーキ燃焼工程 ８ 燃焼エネルギー回収工程 ９ メタンガス回収工程 １１ 濃縮汚泥 ３１ 濃縮汚泥 ５１ 消化汚泥 ６１ 濃縮汚泥 DESCRIPTION OF SYMBOLS 1 First solid-liquid separation tank 2 Biological reaction tank 3 Final solid-liquid separation tank 4 Dehydration apparatus 5 Anaerobic fermentation process 6 Intermediate solid-liquid separation process 7 Cake combustion process 8 Combustion energy recovery process 9 Methane gas recovery process 11 Condensed sludge 31 Concentrated sludge 51 Digested sludge 61 Condensed sludge
フロントページの続き Ｆターム(参考） 4D028 AC01 AC09 BA00 BC18 BD16 BE08 4D059 AA04 AA05 AA06 BA11 BB01 BE01 BE26 CA06 CA07 DA08Continued on the front page F term (reference) 4D028 AC01 AC09 BA00 BC18 BD16 BE08 4D059 AA04 AA05 AA06 BA11 BB01 BE01 BE26 CA06 CA07 DA08
Claims (5)
物反応槽、最終固液分離槽の３種類の槽工程を含む有機
性廃水の処理方法において、最初固液分離槽において分
離した汚泥を脱水装置により脱水処理し、脱水ケーキを
ケーキ燃焼工程において燃焼し、また、最終固液分離槽
において分離した汚泥を嫌気性醗酵工程において消化
し、前記嫌気性醗酵工程で生成する消化汚泥から、リン
酸マグネシウムアンモニウムの形態でリンと窒素を回収
することを特徴とする有機性廃水の処理方法。1. A method for treating organic wastewater comprising three types of tank steps: a first solid-liquid separation tank, a biological reaction tank in which activated sludge floats, and a final solid-liquid separation tank. Is dewatered by a dehydration device, the dewatered cake is burned in a cake combustion process, and the sludge separated in the final solid-liquid separation tank is digested in an anaerobic fermentation process, from digested sludge generated in the anaerobic fermentation process, A method for treating organic wastewater, comprising recovering phosphorus and nitrogen in the form of magnesium ammonium phosphate.
物反応槽に流入する工程の前に、最初固液分離槽の分離
水中に残存する懸濁成分を分離する中間固液分離工程を
設け、かつ、前記中間固液分離工程において分離した汚
泥を、脱水装置により脱水する工程を含むことを特徴と
する請求項１記載の有機性廃水の処理方法。2. An intermediate solid-liquid separation step for first separating suspended components remaining in the separated water in the solid-liquid separation tank before the step of flowing the organic wastewater into the biological reaction tank in which the activated sludge floats. The method for treating organic wastewater according to claim 1, further comprising a step of dehydrating the sludge separated in the intermediate solid-liquid separation step by a dehydrator.
分を分離するために、濾過体の濾過作用を利用する分離
方法、または凝集剤添加による凝集沈殿分離方法のうち
の少なくとも一つの方法を採用することを特徴とする請
求項１または請求項２記載の有機性廃水の処理方法。3. In the intermediate solid-liquid separation step, in order to separate suspended components, at least one of a separation method using a filtration action of a filter and a coagulation precipitation separation method by adding a coagulant is used. The method for treating organic wastewater according to claim 1 or 2, wherein the method is employed.
液分離工程において分離した汚泥を脱水処理した脱水ケ
ーキを燃焼するケーキ燃焼工程において発生するエネル
ギーを回収する燃焼エネルギー回収工程、前記嫌気性醗
酵工程で生成するメタンガス等を回収するメタンガス回
収工程のうちの少なくとも一つの工程を含むことを特徴
とする請求項１〜３のいずれか１項記載の有機性廃水の
処理方法。4. A combustion energy recovery step for recovering energy generated in a cake combustion step for burning a dewatered cake obtained by dehydrating sludge separated in the cake combustion step or the intermediate solid-liquid separation step, and the anaerobic fermentation step. The method for treating organic wastewater according to any one of claims 1 to 3, further comprising at least one of a methane gas recovery step of recovering methane gas and the like generated in step (a).
物反応槽、最終固液分離槽の３種類の槽を含む有機性廃
水の処理装置において、最初固液分離槽にそこで分離し
た汚泥を脱水処理する脱水装置を接続して設け、前記脱
水装置にその脱水ケーキを送るケーキ燃焼装置を接続
し、最終固液分離槽にそこで分離した汚泥を消化し、そ
こで生成する消化汚泥から、リン酸マグネシウムアンモ
ニウムの形態でリンと窒素を回収する嫌気性醗酵装置を
接続して設けたことを特徴とする有機性廃水の処理装
置。5. An organic wastewater treatment apparatus comprising three types of tanks: a solid-liquid separation tank, a biological reaction tank in which activated sludge floats, and a final solid-liquid separation tank. A dewatering device is connected to the dewatering device, a cake combustion device for feeding the dewatered cake is connected to the dewatering device, and the sludge separated there is digested in a final solid-liquid separation tank, and phosphorus is converted from digested sludge generated there. An apparatus for treating organic wastewater, which is provided with an anaerobic fermenter for recovering phosphorus and nitrogen in the form of magnesium ammonium phosphate.
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| JP29390799A JP3672175B2 (en) | 1999-10-15 | 1999-10-15 | Organic wastewater treatment method and treatment apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105130149A (en) * | 2015-07-23 | 2015-12-09 | 中国科学院重庆绿色智能技术研究院 | Method of producing biogas by recycling orange peel residue and dehydrated sludge through fermentation |
| JP2021013900A (en) * | 2019-07-12 | 2021-02-12 | 栗田工業株式会社 | Wastewater treatment method |
-
1999
- 1999-10-15 JP JP29390799A patent/JP3672175B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105130149A (en) * | 2015-07-23 | 2015-12-09 | 中国科学院重庆绿色智能技术研究院 | Method of producing biogas by recycling orange peel residue and dehydrated sludge through fermentation |
| JP2021013900A (en) * | 2019-07-12 | 2021-02-12 | 栗田工業株式会社 | Wastewater treatment method |
| JP7251373B2 (en) | 2019-07-12 | 2023-04-04 | 栗田工業株式会社 | Wastewater treatment method |
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