JP2887439B2 - Method and apparatus for drying organic excess sludge with gas deodorization - Google Patents
Method and apparatus for drying organic excess sludge with gas deodorizationInfo
- Publication number
- JP2887439B2 JP2887439B2 JP6037899A JP3789994A JP2887439B2 JP 2887439 B2 JP2887439 B2 JP 2887439B2 JP 6037899 A JP6037899 A JP 6037899A JP 3789994 A JP3789994 A JP 3789994A JP 2887439 B2 JP2887439 B2 JP 2887439B2
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- gas
- drying
- excess
- organic
- 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 - Lifetime
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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Description
【０００１】[0001]
【産業上の利用分野】本発明は、下水処理場等で大量に
発生する有機性余剰汚泥の乾燥処理と、臭気ガスの経済
的な生物脱臭とを同時に行う方法及び装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for simultaneously drying organic surplus sludge generated in large quantities in a sewage treatment plant and the like and economical biological deodorization of odor gas.
【０００２】[0002]
【従来の技術】従来、特願平４−１８４５９８号（公開
番号は現在不明）には、余剰活性汚泥に多価金属塩又は
／及び多価金属酸化物を添加し、乾燥固定化して脱臭剤
を製造する方法が記載されている。特開昭５８−３６７
００号公報には、汚泥の焼却に汚泥乾燥臭気ガスを利用
し、汚泥の燃焼と熱分解による脱臭とを同時に行う方法
が記載されている。特公平３−７４１５９号公報には、
汚泥の乾燥時に発生する臭気ガスを活性汚泥の曝気槽に
通して脱臭する有機性汚泥の乾燥方法が記載されてい
る。特公昭５９−１４７０８号公報には、汚泥の乾燥機
に燃焼脱臭装置を組み込んで、熱の再利用を図るととも
に、臭気発生を抑えるようにした汚泥乾燥装置が記載さ
れている。特公昭５６−９３９４号公報には、汚泥の乾
燥排気を除湿した後、循環使用し、臭気漏洩を低減する
ようにした汚泥の乾燥処理装置が記載されている。ま
た、特開昭５３−５８１７２号公報には、汚泥等の廃棄
物を焼却する際に、汚泥の予備乾燥に焼却排ガスを利用
し、臭気を含む乾燥排ガスは焼却炉で脱臭する廃棄物の
乾燥及び焼却方法が記載されている。2. Description of the Related Art Conventionally, Japanese Patent Application No. 4-184598 (publication number is unknown at present) discloses a method of adding a polyvalent metal salt and / or a polyvalent metal oxide to excess activated sludge, drying and fixing the sludge, and deodorizing the deodorant. Are described. JP-A-58-367
No. 00 describes a method of utilizing sludge dry odor gas for incineration of sludge and simultaneously performing sludge combustion and deodorization by thermal decomposition. In Japanese Patent Publication No. 3-74159,
A method for drying organic sludge in which odor gas generated when drying sludge is passed through an activated sludge aeration tank to deodorize the sludge is described. Japanese Patent Publication No. Sho 59-14708 discloses a sludge drying apparatus in which a combustion deodorization apparatus is incorporated in a sludge dryer to reuse heat and suppress odor generation. Japanese Patent Publication No. 56-9394 discloses a sludge drying treatment apparatus in which drying and exhausting of sludge is dehumidified and then circulated to reduce odor leakage. Japanese Patent Application Laid-Open No. 53-58172 discloses that when waste such as sludge is incinerated, incineration exhaust gas is used for preliminary drying of the sludge, and the drying exhaust gas containing odor is dried by incinerators. And incineration methods.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記の従来の
技術では、つぎのような問題点がある。 （１） 臭気ガス中の臭気成分が高濃度である場合、臭
気成分の除去能力が低い。 （２） 従来技術において製造した脱臭剤では、脱臭能
力発現までに１週間以上の馴養期間が必要である。 （３） 従来技術では、高温で汚泥を乾燥させるため、
汚泥中の有用微生物を有効利用することができない。 （４） 従来技術においては、汚泥乾燥時に臭気が発生
し、また、乾燥した汚泥から臭気が発生する。 （５） 燃焼脱臭方法では、多大なエネルギーを要す
る。 （６） 曝気式の脱臭では、臭気の除去効率が低く、完
全な臭気の低減が不可能である。 また、最近では、各種の汚泥処理場において、取り扱い
及び処分を容易にするために、含水汚泥を乾燥汚泥にし
て固形化、減容化する傾向が強くなってきている。However, the above-mentioned prior art has the following problems. (1) When the odor component in the odor gas is high, the odor component removal capability is low. (2) With the deodorant manufactured in the prior art, a period of acclimation of one week or more is required until the deodorizing ability is developed. (3) In the prior art, in order to dry sludge at high temperature,
The useful microorganisms in the sludge cannot be used effectively. (4) In the prior art, odor is generated when sludge is dried, and odor is generated from dried sludge. (5) The combustion deodorization method requires a large amount of energy. (6) In the aeration type deodorization, the odor removal efficiency is low, and it is impossible to completely reduce the odor. In recent years, in various sludge treatment plants, in order to facilitate handling and disposal, the tendency to solidify and reduce the volume of hydrous sludge into dry sludge has been increasing.
【０００４】本発明は上記の諸点に鑑みなされたもの
で、本発明の目的は、１００℃以下の温度で臭気ガスを
導入し、臭気成分の一部を除去しながら、生物処理場余
剰汚泥を乾燥させることにより、乾燥ゾーンで１次脱臭
するため、後段の脱臭装置の容量が少なくてすむように
したガス脱臭を伴う汚泥の乾燥方法及び装置を提供する
ことにある。本発明の他の目的は、乾燥機出口の１次処
理された臭気ガスを、別途乾燥汚泥の一部を予め充填し
た生物脱臭塔で２次脱臭することにより、臭気ガスを処
理しながら汚泥を乾燥し、かつ、脱臭剤の製造をも行う
ことができるガス脱臭を伴う汚泥の乾燥方法及び装置を
提供することにある。The present invention has been made in view of the above points, and an object of the present invention is to introduce an odor gas at a temperature of 100 ° C. or lower to remove a part of the odor component while removing excess sludge from a biological treatment plant. An object of the present invention is to provide a method and an apparatus for drying sludge accompanied by gas deodorization, in which the primary deodorization is performed in a drying zone by drying, so that the capacity of a deodorizing apparatus at the subsequent stage can be reduced. Another object of the present invention is to secondarily deodorize the first-treated odor gas at the outlet of the dryer in a biological deodorization tower previously filled with a part of the dried sludge, thereby removing the sludge while treating the odor gas. An object of the present invention is to provide a method and an apparatus for drying sludge with gas deodorization, which can be dried and can also produce a deodorant.
【０００５】[0005]
【課題を解決するための手段及び作用】上記の目的を達
成するために、本発明のガス脱臭を伴う有機性余剰汚泥
の乾燥方法は、有機物を含む廃水を生物処理する際に発
生する脱水処理された余剰汚泥と有機性汚泥由来の臭気
ガスとを、汚泥中の脱臭能力を有する微生物が死滅ある
いは不活性化して脱臭効率が低下することなく、かつ、
汚泥の乾燥が十分に行えるように、９０〜４０℃の温度
で接触させて、臭気成分の少なくとも一部を除去しなが
ら余剰汚泥を乾燥することを特徴としている。脱水処理
された汚泥と有機性汚泥由来の臭気ガスとを接触させる
乾燥ゾーンの温度は、上記のように、９０〜４０℃の範
囲である。この範囲より高いと、汚泥中の脱臭能力を有
する微生物が死滅あるいは不活性化して１次脱臭の効率
が低下する傾向があり、一方、この範囲より低いと、汚
泥の乾燥が不十分となる傾向がある。SUMMARY OF THE INVENTION In order to achieve the above object, the method for drying organic excess sludge accompanied by gas deodorization according to the present invention provides a method for dehydrating wastewater containing organic matter generated by biological treatment. has been the odorous gas from excess sludge and organic sludge, the microorganism is killed with a deodorizing capability in the sludge
Or deactivate to reduce the deodorizing efficiency, and
In order to sufficiently dry the sludge, the sludge is contacted at a temperature of 90 to 40 [deg.] C. , and the excess sludge is dried while removing at least a part of the odor component. Dehydration treatment
As described above, the temperature of the drying zone where the waste sludge is brought into contact with the odor gas derived from the organic sludge is in the range of 90 to 40 ° C.
It is an enclosure . If it is higher than this range, microorganisms having a deodorizing ability in sludge will be killed or inactivated, and the efficiency of primary deodorization tends to decrease. On the other hand, if it is lower than this range, sludge will be insufficiently dried. There is.
【０００６】また、本発明の方法は、有機物を含む廃水
を生物処理する際に発生する脱水処理された余剰汚泥と
有機性汚泥由来の臭気ガスとを、汚泥中の脱臭能力を有
する微生物が死滅あるいは不活性化して脱臭効率が低下
することなく、かつ、汚泥の乾燥が十分に行えるよう
に、９０〜４０℃の温度で接触させて、臭気成分の一部
を除去する１次脱臭を行いながら余剰汚泥を乾燥し、脱
臭剤として乾燥汚泥の一部を予め充填した充填層と１次
脱臭された臭気ガスとを接触させて、残存臭気成分を除
去する２次脱臭を行うことを特徴としている。[0006] The method of the present invention is also capable of removing excess sludge that has been subjected to dehydration treatment and that is generated when biologically treating wastewater containing organic matter.
It has the ability to deodorize odor gas derived from organic sludge in sludge.
Microorganisms are killed or inactivated and deodorization efficiency decreases
So that sludge can be dried sufficiently without
To, by contacting at a temperature of 90 to 40 ° C., the excess sludge is dried while primary deodorization to remove a portion of odorous, de
It is characterized in that a secondary deodorization for removing residual odor components is performed by bringing a packed layer, which has been previously filled with a part of dry sludge as an odorant, into contact with a primary deodorized odor gas.
【０００７】上記の方法において、余剰汚泥と臭気ガス
とを向流で接触させることが好ましい。しかし、並流又
は十字流で接触させることも可能である。また、余剰汚
泥の前処理として、余剰汚泥中の脱臭能力を有する微生
物が死滅あるいは不活性化して乾燥時の脱臭能力が低下
することなく、かつ、余剰汚泥中の有機物の酸化分解効
率が低下しないように、余剰汚泥を３０〜８０℃の範囲
に加温して曝気する工程又は／及び余剰汚泥を水洗して
有機物の分解物を洗い流す工程を付加することが好まし
い。加温温度は、上記のように３０〜８０℃であるが、
６０〜６５℃とするのが望ましい。この範囲より高い
と、余剰汚泥中の脱臭能力を有する微生物が死滅あるい
は不活性化して、乾燥時の１次脱臭能力が低下する傾向
があり、一方、この範囲より低いと、余剰汚泥中の有機
物の酸化分解効率が低下し、脱水後に腐敗しやすい有機
物が残存することとなり、汚泥臭やカビの発生の原因と
なる傾向がある。上記の加温曝気と水洗とは、一方又は
両方を実施する場合があり、両方を実施する場合は、水
洗に先立って加温曝気をする必要がある。In the above method, it is preferable that the excess sludge and the odor gas are brought into contact with each other in countercurrent. However, it is also possible to contact in co-current or cross-flow. In addition, surplus
As a pretreatment of mud, microbes with deodorizing ability in excess sludge
Death or inactivation of the material reduces the deodorizing ability during drying
Oxidative decomposition of organic matter in excess sludge
As the rate is not reduced, by washing steps and / or excess sludge is warmed aeration in the range of the excess sludge 30 to 80 ° C.
It is preferable to add a step of washing away the decomposition products of organic substances . The heating temperature is 30 to 80 ° C. as described above ,
The temperature is desirably 60 to 65 ° C. If it is higher than this range, microorganisms having a deodorizing ability in excess sludge will be killed or inactivated, and the primary deodorizing ability at the time of drying tends to decrease. The efficiency of the oxidative decomposition of the organic solvent decreases, and the organic matter which tends to decay after dehydration remains, which tends to cause the generation of sludge odor and mold. One or both of the above-mentioned heating aeration and water washing may be performed. When both are performed, it is necessary to perform heating aeration prior to water washing.
【０００８】また、乾燥工程における汚泥を塊状体に成
型することが好ましい。本発明において用いられる余剰
汚泥としては、下水処理場から排出される余剰汚泥、活
性汚泥装置から排出される余剰汚泥及びオキシデーショ
ンディッチ（ｏｘｉｄａｔｉｏｎ ｄｉｔｃｈ、酸化
池）から排出される余剰汚泥の少なくとも１種を挙げる
ことができる。It is preferable that the sludge in the drying step is formed into a lump. The excess sludge used in the present invention is at least one of excess sludge discharged from a sewage treatment plant, excess sludge discharged from an activated sludge device, and excess sludge discharged from an oxidation ditch (oxidation pond). Can be mentioned.
【０００９】本発明のガス脱臭を伴う有機性余剰汚泥の
乾燥装置は、図２に示すように、上部に汚泥投入口１０
及びガス排出口１２を有し、下部に乾燥汚泥排出口１４
を有する乾燥機本体１６と、この本体１６内の下部に臭
気ガスを導入するように接続された臭気ガス導入管１８
と、前記汚泥投入口１０の下側に設けられた、本体１６
内に投入された汚泥２０を搬送しつつ臭気ガスと接触さ
せて予備乾燥させるための上段汚泥搬送手段２２と、こ
の上段汚泥搬送手段２２の下側に設けられた、予備乾燥
された汚泥２４を搬送しつつ臭気ガスと接触させて本乾
燥させるための下段汚泥搬送手段２６と、この下段汚泥
搬送手段２６の上端に設けられた板状汚泥形成ノズル２
８と、この板状汚泥形成ノズル２８の下流側に隣接して
設けられた汚泥切断ローラ３０と、からなることを特徴
としている。As shown in FIG. 2, the apparatus for drying organic excess sludge accompanied by gas deodorization according to the present invention has a sludge inlet 10 at its upper part.
And a gas discharge port 12, and a dry sludge discharge port 14
And a odor gas introduction pipe 18 connected to a lower portion inside the body 16 so as to introduce an odor gas.
And a main body 16 provided below the sludge inlet 10.
The upper sludge conveying means 22 for contacting with the odor gas and pre-drying while conveying the sludge 20 charged therein, and the pre-dried sludge 24 provided below the upper sludge conveying means 22 Lower sludge conveying means 26 for contacting with odorous gas while carrying the main sludge, and plate-like sludge forming nozzle 2 provided at the upper end of lower sludge conveying means 26
8 and a sludge cutting roller 30 provided adjacent to the downstream side of the plate-like sludge forming nozzle 28.
【００１０】上記の装置において、汚泥切断ローラ３０
を、板状汚泥２４を搬送方向に切断する第１切断ローラ
３０ａと、搬送方向と直交する方向に切断する第２切断
ローラ３０ｂとから構成することが好ましい。なお、第
１切断ローラ３０ａの上流側に第２切断ローラ３０ｂを
設置しても差し支えない。また、上段汚泥搬送手段２２
及び下段汚泥搬送手段２６を、多孔体ベルト３２とロー
ラ３４とからなるベルトコンベアで構成することが好ま
しい。３６はブロワ、３８は予備乾燥汚泥落下導管、４
０は予備乾燥汚泥受け、４２は汚泥押出しポンプ、４４
は臭気ガスを加温するためのヒータ、４６は製品ホッパ
である。In the above apparatus, the sludge cutting roller 30
Is preferably constituted by a first cutting roller 30a for cutting the plate-like sludge 24 in the transport direction and a second cutting roller 30b for cutting in the direction orthogonal to the transport direction. The second cutting roller 30b may be provided upstream of the first cutting roller 30a. In addition, the upper sludge conveying means 22
It is preferable that the lower sludge conveying means 26 be constituted by a belt conveyor including a porous belt 32 and a roller 34. 36 is a blower, 38 is a pre-dried sludge falling conduit, 4
0 is a pre-dried sludge receiver, 42 is a sludge extrusion pump, 44
Is a heater for heating the odor gas, and 46 is a product hopper.
【００１１】さらに、図１に示すように、図２に示す低
温乾燥機５０に加えて、別途本乾燥させた汚泥の一部を
予め充填した生物脱臭塔５２を設け、この生物脱臭塔５
２と乾燥機本体１６のガス排出口１２とを１次脱臭ガス
供給管５４を介して接続して、１次脱臭された臭気ガス
を生物脱臭塔５２に導入して２次脱臭するように構成す
ることが好ましい。５６は充填層である。Further, as shown in FIG. 1, in addition to the low-temperature dryer 50 shown in FIG. 2, a biological deodorization tower 52 previously filled with a part of sludge which has been completely dried is provided.
2 and the gas outlet 12 of the dryer main body 16 are connected via a primary deodorizing gas supply pipe 54 so that the primary deodorized odor gas is introduced into the biological deodorization tower 52 for secondary deodorization. Is preferred. 56 is a filling layer.
【００１２】低温乾燥機５０は、上記の構造のものに限
らず、含水率の低い汚泥から含水率の高い汚泥すべてに
臭気ガスが接触できるものであればよい。乾燥機５０を
通過することによって臭気の低減した乾燥機排出ガス
は、乾燥汚泥の一部を予め充填した生物脱臭塔５２に導
入され、残存臭気が除去される。以下、詳細に説明す
る。まず、下水処理場の返送汚泥、あるいはその加圧浮
上分離等による濃縮汚泥を遠心分離等の連続脱水機（図
示略）で、水分８５〜８８wt％に脱水して脱水ケーキと
する。使用する汚泥の有機物含量が高い場合は、汚泥を
１２〜２４時間、８０℃以下、好ましくは６５℃以下で
曝気して有機物を分解する。分解物が多い場合は、汚泥
の１／５〜２倍量の水を添加後脱水することで分解物を
洗い流す。多量の有機物を除去することで汚泥自身から
の臭気の発生を抑えるためである。脱水は、いかなる形
式の脱水機でもよいが、乾燥汚泥の強度を高くするため
に、高分子凝集剤等の添加濃度は２wt％以下とする必要
がある。The low-temperature dryer 50 is not limited to the one having the above-described structure, but may be any as long as it can contact odor gas with all sludges having a low moisture content to sludges having a high moisture content. The dryer exhaust gas, whose odor has been reduced by passing through the dryer 50, is introduced into the biological deodorization tower 52 in which a part of the dried sludge has been filled in advance, and the residual odor is removed. The details will be described below. First, returned sludge from a sewage treatment plant or concentrated sludge obtained by pressurized flotation or the like is dewatered to a water content of 85 to 88 wt% by a continuous dehydrator (not shown) such as a centrifugal separator to obtain a dewatered cake. When the organic matter content of the sludge to be used is high, the sludge is aerated at 80 ° C. or less, preferably 65 ° C. or less for 12 to 24 hours to decompose the organic matter. When the amount of the decomposed product is large, the decomposed product is washed away by adding 1/5 to twice the amount of water of the sludge and then dewatering. This is because the removal of a large amount of organic substances suppresses the generation of odor from the sludge itself. Although any type of dehydrator may be used for dehydration, the concentration of the polymer flocculant or the like must be 2 wt% or less in order to increase the strength of the dried sludge.
【００１３】このようにして調製された脱水ケーキは、
多段ベルトコンベア等で構成される上段汚泥搬送手段２
２上に投入され、乾燥汚泥排出口１４における乾燥機出
口水分１０〜１５wt％、機内温度が９０〜４０℃の範囲
となるような条件で、臭気ガスを導入する。ついで、８
２〜８５wt％程度に予備乾燥された汚泥ケーキは下段汚
泥搬送手段２６上に板状に押し出される。脱水ケーキ
は、第１切断ローラ３０ａ及び第２切断ローラ３０ｂ
で、例えば、１０mm角に正方形の切れ目を入れるだけで
中に自ら収縮し、サイコロ状に成型された乾燥体（製
品）とすることができ、乾燥速度を高めることができ
る。また、この乾燥体を脱臭剤として使用する時に、脱
臭率を高めることができる。剥離性の高い脱水汚泥ケー
キの場合は、予備乾燥工程を経ずに、直接、下段汚泥搬
送手段２６上に板状に押し出すこともできる。一方、乾
燥機５０とは別に乾燥汚泥（製品乾燥体）の一部を充填
塔に詰めた生物脱臭塔５２を設け、この生物脱臭塔５２
に臭気の低減した乾燥機排ガスを導入し、臭気成分を完
全に除去する。[0013] The dehydrated cake thus prepared is
Upper sludge conveying means 2 composed of a multi-stage belt conveyor, etc.
2 in the drying sludge outlet 14, the moisture at the dryer outlet is 10 to 15 wt%, and the temperature in the machine is in the range of 90 to 40 ° C.
In becomes such conditions as to introduce the odorous gas. Then 8
The sludge cake preliminarily dried to about 2 to 85 wt% is extruded in a plate shape on the lower sludge conveying means 26. The dewatered cake is divided into a first cutting roller 30a and a second cutting roller 30b.
Thus, for example, by simply making a square cut in a 10 mm square, it can shrink in itself and become a dried body (product) molded in a dice shape, and the drying speed can be increased. Further, when this dried product is used as a deodorant, the deodorization rate can be increased. In the case of a dewatered sludge cake having a high releasability, the cake can be directly extruded onto the lower sludge conveying means 26 without passing through a preliminary drying step. On the other hand, apart from the dryer 50, a biological deodorization tower 52 in which a part of dried sludge (dried product) is packed in a packed tower is provided.
Dryer exhaust gas with reduced odor is introduced to the hopper to completely remove odor components.
【００１４】[0014]
【実施例】以下、本発明を実施例に基づいてさらに詳細
に説明するが、本発明は下記実施例に何ら限定されるも
のではなく、適宜変更して実施することが可能なもので
ある。 実施例１ 図１に示すフローに従って試験を行った。原料として、
下水処理場の余剰汚泥を加圧浮上分離によって濃縮した
ＳＳ（Ｓｕｓｐｅｎｄｅｄ Ｓｏｌｉｄ、固形分）約４
wt％の汚泥を、新鮮なうちに連続遠心脱水機により２，
１００G で８８wt％水分の脱水ケーキとしたものを用い
た。乾燥機として、図２に示す構造のものを用い、汚泥
投入口１０から脱水ケーキを投入し、予備乾燥で８５wt
％水分にまで低下させた後、押出しポンプ４２を経て板
状汚泥形成ノズル２８から予備乾燥汚泥を板状に押し出
した。押し出された板状汚泥２４は切断ローラ３０ａ、
３０ｂで切れ目が入れられ、ベルト３２で下部へ移送さ
れる間に乾燥され、１５wt％水分の乾燥汚泥が製品ホッ
パ４６に収納された。乾燥のための送風として、臭気を
含んだガスを用い、この臭気ガスはブロワ３６で臭気ガ
ス導入管１８から導入され、ヒータ４４で７０℃に加温
されたベルトコンベアの間を、汚泥の流れと逆に（向流
に）通過して、汚泥の水分を吸収して排出された。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the following examples, and can be implemented with appropriate modifications. Example 1 A test was performed according to the flow shown in FIG. As a raw material,
Approximately 4 SS (Suspended Solid, solid content) obtained by concentrating excess sludge from sewage treatment plant by pressure flotation
wt% of the sludge while fresh
A dehydrated cake of 100 G and a water content of 88 wt% was used. A dryer having the structure shown in FIG. 2 was used as the dryer, and the dewatered cake was charged from the sludge inlet 10 and 85 wt.
%, The pre-dried sludge was extruded into a plate shape from the plate-shaped sludge forming nozzle 28 via the extrusion pump 42. The extruded plate sludge 24 is cut by a cutting roller 30a,
A cut was made at 30b and dried while being transported to the lower portion by the belt 32. Dry sludge having a moisture content of 15 wt% was stored in the product hopper 46. A gas containing odor is used as air for drying, and the odor gas is introduced from the odor gas introduction pipe 18 by the blower 36 and flows between the belt conveyors heated to 70 ° C. by the heater 44. On the contrary, it passed (counter-current), absorbed the sludge and discharged.
【００１５】乾燥機入口臭気及び乾燥機出口臭気を測定
し、臭気成分の除去率を求めた結果を図３及び図４に示
す。図３は、Ｈ2 Ｓ １５ppm を含む臭気ガスを乾燥機
５０に導入して連続的に汚泥を乾燥させる際に、汚泥容
積に対する通ガス量（空間速度、ＳＶ）を変化させて、
ＳＶとＨ2 Ｓの除去率とを測定した結果を示している。
また、図４は、乾燥機５０に導入する臭気ガス中のＨ2
Ｓ濃度を変化させ、７０℃でＳＶが３５ h-1、９０ h-1
及び３０００ h-1の場合について、Ｈ2 Ｓの除去率を測
定した結果を示している。The results of measuring the odor at the dryer inlet and the odor at the dryer outlet and obtaining the odor component removal rate are shown in FIGS. 3 and 4. FIG. 3 shows that when the odor gas containing 15 ppm of H 2 S is introduced into the dryer 50 to continuously dry the sludge, the amount of gas passing through the sludge volume (space velocity, SV) is changed.
It shows the results of measuring SV and the removal rate of H 2 S.
FIG. 4 shows H 2 in the odor gas introduced into the dryer 50.
By changing the S concentration, the SV was 35 h -1 and 90 h -1 at 70 ° C.
3 shows the results of measuring the removal rate of H 2 S for the cases of 3,000 h −1 and 3,000 h −1 .
【００１６】１５ppm のＨ2 Ｓを含む導入臭気ガスに対
して、汚泥容積に対する通ガス量（空間速度）（ＳＶ）
＝１００hr-1の時で約８０％、ＳＶ＝２００hr-1で約５
０％Ｈ2 Ｓが除去された（図３）。さらに、ＳＶ＝３５
hr-1では８０ppm のＨ2 Ｓに対しても８０％の除去率が
可能であった（図４）。臭気ガスで乾燥した乾燥汚泥
（一辺１０mm角のサイコロ状に切断し乾燥させたもの）
は、無臭の空気で乾燥したものと変わりなく、充填塔式
脱臭装置の脱臭剤として十分に能力を発揮した。With respect to the introduced odor gas containing 15 ppm of H 2 S, the amount of gas passing through the sludge volume (space velocity) (SV)
Approx. 80% when SV = 100 hr -1 and approx. 5 when SV = 200 hr -1
0% H 2 S was removed (FIG. 3). Further, SV = 35
At hr -1 , an 80% removal rate was possible even with 80 ppm of H 2 S (FIG. 4). Dried sludge dried with odorous gas (cut and dried into a 10 mm square die)
Did not differ from those dried with odorless air, and showed a sufficient performance as a deodorant in a packed tower deodorizer.
【００１７】実施例２ 有機物含量の高い汚泥は、そのままでは良好な脱臭性能
が得られないため、滞留時間２４hrで６０℃に加温して
曝気し、その後、３wt％の無機凝縮剤（硫酸バンド）を
添加し、実施例１と同様に脱水ケーキとしたものを供試
した。そして、実施例１と同様の乾燥処理を行うことに
より、乾燥汚泥（一辺１０mm角のサイコロ状に切断し乾
燥させたもの）は充填用の脱臭剤として使用することが
できた。Example 2 Since sludge having a high organic matter content does not provide good deodorizing performance as it is, it is heated and aerated at 60 ° C. for a residence time of 24 hours, and then 3 wt% of an inorganic condensing agent (sulfuric acid band) ) Was added to obtain a dehydrated cake in the same manner as in Example 1. Then, by performing the same drying treatment as in Example 1, the dried sludge (which was cut into a 10 mm square die and dried) could be used as a deodorizing agent for filling.
【００１８】[0018]
【発明の効果】本発明は上記のように構成されているの
で、つぎのような効果を奏する。 （１） 乾燥ゾーンで、脱水処理された汚泥を乾燥する
とともに、有機性汚泥由来の臭気ガスの１次脱臭を行う
ので、後段の脱臭装置の負荷、容量が少なくてすむ。 （２） 後段に、脱臭剤として乾燥汚泥を充填して用い
る生物脱臭装置を設置する場合、脱臭剤の自前の製造が
できる。 （３） 乾燥温度を９０〜４０℃の範囲と低く制御する
ので、乾燥に対する熱源として低位の温熱源が利用でき
る。 （４） 乾燥汚泥が９０〜４０℃の低温で乾燥されてい
るので、活性を残存させた微生物が多量に存在し、この
ため、乾燥汚泥が生物脱臭剤やコンポスト原料として有
効に利用でき、固形化、減容化されているので、汚泥の
廃棄処分が容易になる。 （５） 乾燥機に投入する汚泥を３０〜８０℃で加温曝
気、水洗及び／又は塊状体に成形する場合は、脱臭能力
及び乾燥速度を向上させることができる。As described above, the present invention has the following effects. (1) In the drying zone, the dewatered sludge is dried and the primary deodorization of the odor gas derived from the organic sludge is performed. Therefore, the load and capacity of the deodorization device at the subsequent stage can be reduced. (2) to the subsequent, when installing the biological deodorization device used by filling the dried sludge as a deodorant can own production of deodorizer. (3) Since the drying temperature is controlled as low as 90 to 40 ° C., a low-temperature heat source can be used as a heat source for drying. (4) Since the dried sludge is dried at a low temperature of 90 to 40 ° C., a large amount of microorganisms having remaining activity are present. Therefore, the dried sludge can be effectively used as a biodeodorant or a raw material for compost. The sludge has been reduced in volume, making sludge disposal easier. (5) When the sludge to be put into the dryer is heated and aerated at 30 to 80 ° C. , washed with water and / or formed into a lump, the deodorizing ability and the drying speed can be improved.
【図１】本発明のガス脱臭を伴う有機性余剰汚泥の乾燥
装置の一実施例を示すフローシートである。FIG. 1 is a flow sheet showing one embodiment of a device for drying organic excess sludge with gas deodorization of the present invention.
【図２】図１における低温乾燥機の一例を示す概略構成
図である。FIG. 2 is a schematic configuration diagram illustrating an example of a low-temperature dryer in FIG.
【図３】低温乾燥機における空間速度（ＳＶ）とＨ2 Ｓ
除去率との関係を示すグラフである。FIG. 3 shows space velocity (SV) and H 2 S in a low-temperature dryer.
It is a graph which shows the relationship with a removal rate.
【図４】低温乾燥機におけるＨ2 Ｓ濃度とＨ2 Ｓ除去率
との関係を示すグラフである。FIG. 4 is a graph showing a relationship between H 2 S concentration and H 2 S removal rate in a low-temperature dryer.
１０ 汚泥投入口 １２ ガス排出口 １４ 乾燥汚泥排出口 １６ 乾燥機本体 １８ 臭気ガス導入管 ２０ 汚泥 ２２ 上段汚泥搬送手段 ２４ 汚泥 ２６ 下段汚泥搬送手段 ２８ 板状汚泥形成ノズル ３０ 汚泥切断ローラ ３０ａ 第１切断ローラ ３０ｂ 第２切断ローラ ３２ 多孔体ベルト ３４ ローラ ５０ 低温乾燥機 ５２ 生物脱臭塔 ５４ １次脱臭ガス供給管 DESCRIPTION OF SYMBOLS 10 Sludge inlet 12 Gas outlet 14 Dry sludge outlet 16 Dryer main body 18 Odor gas introduction pipe 20 Sludge 22 Upper sludge conveying means 24 Sludge 26 Lower sludge conveying means 28 Plate sludge forming nozzle 30 Sludge cutting roller 30a First cutting Roller 30b Second cutting roller 32 Porous belt 34 Roller 50 Low temperature dryer 52 Biological deodorization tower 54 Primary deodorizing gas supply pipe
───────────────────────────────────────────────────── フロントページの続き (72)発明者 林谷 正雄 兵庫県明石市川崎町１番１号 川崎重工 業株式会社 明石工場内 (72)発明者 澤井 正和 神戸市中央区東川崎町１丁目１番３号 川崎重工業株式会社 神戸本社内 (56)参考文献 特開 昭60−17681（ＪＰ，Ａ) 特開 昭58−208576（ＪＰ，Ａ) 特公 平１−24970（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.6，ＤＢ名) C02F 11/00 - 11/20 B01D 53/34 F26B 13/00 - 25/22 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masao Hayashiya 1-1, Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside the Akashi Plant (72) Inventor Masakazu Sawai 1-3-1, Higashi-Kawasaki-cho, Chuo-ku, Kobe-shi No. Kawasaki Heavy Industries, Ltd. Kobe Head Office (56) References JP-A-60-17681 (JP, A) JP-A-58-208576 (JP, A) JP-B-1-24970 (JP, B2) (58) Survey Field (Int.Cl. 6 , DB name) C02F 11/00-11/20 B01D 53/34 F26B 13/00-25/22
Claims (10)
生する脱水処理された余剰汚泥と有機性汚泥由来の臭気
ガスとを、汚泥中の脱臭能力を有する微生物が死滅ある
いは不活性化して脱臭効率が低下することなく、かつ、
汚泥の乾燥が十分に行えるように、９０〜４０℃の温度
で接触させて、臭気成分の少なくとも一部を除去しなが
ら余剰汚泥を乾燥することを特徴とするガス脱臭を伴う
有機性余剰汚泥の乾燥方法。1. A and odorous gas from excess sludge and organic sludge which has been dehydrated to occur when biological treatment of waste water containing organic substances, microorganisms is killed with a deodorizing capability in the sludge
Or deactivate to reduce the deodorizing efficiency, and
In order to sufficiently dry the sludge, the organic sludge is contacted at a temperature of 90 to 40 ° C. , and the excess sludge is dried while removing at least a part of the odor component. Drying method.
生する脱水処理された余剰汚泥と有機性汚泥由来の臭気
ガスとを、汚泥中の脱臭能力を有する微生物が死滅ある
いは不活性化して１次脱臭の効率が低下することなく、
かつ、汚泥の乾燥が十分に行えるように、９０〜４０℃
の温度で接触させて、臭気成分の一部を除去する１次脱
臭を行いながら余剰汚泥を乾燥し、脱臭剤として乾燥汚
泥の一部を予め充填した充填層と１次脱臭された臭気ガ
スとを接触させて、残存臭気成分を除去する２次脱臭を
行うことを特徴とするガス脱臭を伴う有機性余剰汚泥の
乾燥方法。Wherein the odorous gas from excess sludge and organic sludge which has been dehydrated to occur when biological treatment of waste water containing organic substances, microorganisms is killed with a deodorizing capability in the sludge
Or deactivate and reduce the efficiency of primary deodorization,
And 90 to 40 ° C. so that the sludge can be sufficiently dried.
The excess sludge is dried while performing primary deodorization to remove a part of the odor component by contacting at a temperature of, and a packed layer preliminarily filled with a part of the dried sludge as a deodorant and a primary deodorized odor gas are used. And a secondary deodorization for removing residual odor components by contacting the sludge with an organic solvent.
十字流で接触させることを特徴とする請求項１又は２記
載のガス脱臭を伴う有機性余剰汚泥の乾燥方法。3. The method for drying organic excess sludge with gas deodorization according to claim 1, wherein the excess sludge and the odorous gas are brought into contact with each other in countercurrent, cocurrent or crossflow.
脱臭能力を有する微生物が死滅あるいは不活性化して乾
燥時の脱臭能力が低下することなく、かつ、余剰汚泥中
の有機物の酸化分解効率が低下しないように、余剰汚泥
を３０〜８０℃の範囲に加温して曝気する工程又は／及
び余剰汚泥を水洗して有機物の分解物を洗い流す工程を
付加することを特徴とする請求項１、２又は３記載のガ
ス脱臭を伴う有機性余剰汚泥の乾燥方法。4. The pretreatment of the excess sludge includes the step of
Microorganisms with deodorizing ability are killed or inactivated and dry
Deodorizing ability during drying does not decrease, and in excess sludge
In order to prevent the efficiency of oxidative decomposition of organic substances from decreasing, a step of heating and aerating the excess sludge in the range of 30 to 80 ° C. and / or a step of washing the excess sludge with water and washing away the decomposition products of organic substances are added. 4. The method for drying organic excess sludge with gas deodorization according to claim 1, 2 or 3.
ることを特徴とする請求項１〜４のいずれかに記載のガ
ス脱臭を伴う有機性余剰汚泥の乾燥方法。5. The method for drying organic excess sludge with gas deodorization according to claim 1, wherein the sludge in the drying step is formed into a lump.
剰汚泥、活性汚泥装置から排出される余剰汚泥及びオキ
シデーションディッチから排出される余剰汚泥の少なく
とも１種であることを特徴とする請求項１〜５のいずれ
かに記載のガス脱臭を伴う有機性余剰汚泥の乾燥方法。6. The method according to claim 1, wherein the excess sludge is at least one of excess sludge discharged from a sewage treatment plant, excess sludge discharged from an activated sludge device, and excess sludge discharged from an oxidation ditch. The method for drying organic excess sludge with gas deodorization according to any one of claims 1 to 5.
し、下部に乾燥汚泥排出口を有する乾燥機本体と、 この本体内の下部に臭気ガスを導入するように接続され
た臭気ガス導入管と、 前記汚泥投入口の下側に設けられた、本体内に投入され
た汚泥を搬送しつつ臭気ガスと接触させて予備乾燥させ
るための上段汚泥搬送手段と、 この上段汚泥搬送手段の下側に設けられた、予備乾燥さ
れた汚泥を搬送しつつ臭気ガスと接触させて本乾燥させ
るための下段汚泥搬送手段と、 この下段汚泥搬送手段の上端に設けられた板状汚泥形成
ノズルと、 この板状汚泥形成ノズルの下流側に隣接して設けられた
汚泥切断ローラと、 からなることを特徴とするガス脱臭を伴う有機性余剰汚
泥の乾燥装置。7. A dryer body having a sludge inlet and a gas outlet at an upper portion and a dry sludge outlet at a lower portion, and an odor gas inlet connected to introduce a odor gas into a lower portion of the body. A pipe, an upper sludge conveying means provided below the sludge inlet, for conveying the sludge introduced into the main body and contacting it with an odor gas for preliminary drying, and under the upper sludge conveying means. Provided on the side, a lower-stage sludge conveying means for bringing the pre-dried sludge into contact with an odor gas while performing main drying, and a plate-like sludge forming nozzle provided at an upper end of the lower-stage sludge conveying means, A sludge cutting roller provided adjacent to the downstream side of the plate-like sludge forming nozzle; and a device for drying organic excess sludge accompanied by gas deodorization.
に切断する第１切断ローラと、搬送方向と直交する方向
に切断する第２切断ローラとからなることを特徴とする
請求項７記載のガス脱臭を伴う有機性余剰汚泥の乾燥装
置。8. The sludge cutting roller comprises a first cutting roller for cutting plate sludge in a conveying direction and a second cutting roller for cutting plate sludge in a direction perpendicular to the conveying direction. For drying excess organic sludge with gas deodorization.
が、多孔体ベルトとローラとからなるベルトコンベアで
あることを特徴とする請求項７又は８記載のガス脱臭を
伴う有機性余剰汚泥の乾燥装置。9. The drying of organic excess sludge with gas deodorization according to claim 7, wherein the upper sludge conveying means and the lower sludge conveying means are a belt conveyor comprising a porous belt and a roller. apparatus.
填した生物脱臭塔を設け、この生物脱臭塔と乾燥機本体
のガス排出口とを１次脱臭ガス供給管を介して接続した
ことを特徴とする請求項７、８又は９記載のガス脱臭を
伴う有機性余剰汚泥の乾燥装置。10. A biological deodorization tower which is separately filled with a part of sludge which has been completely dried in advance, and the biological deodorization tower and a gas outlet of a dryer body are connected via a primary deodorizing gas supply pipe. The apparatus for drying organic excess sludge with gas deodorization according to claim 7, 8, or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6037899A JP2887439B2 (en) | 1994-02-10 | 1994-02-10 | Method and apparatus for drying organic excess sludge with gas deodorization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6037899A JP2887439B2 (en) | 1994-02-10 | 1994-02-10 | Method and apparatus for drying organic excess sludge with gas deodorization |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07222999A JPH07222999A (en) | 1995-08-22 |
| JP2887439B2 true JP2887439B2 (en) | 1999-04-26 |
Family
ID=12510395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6037899A Expired - Lifetime JP2887439B2 (en) | 1994-02-10 | 1994-02-10 | Method and apparatus for drying organic excess sludge with gas deodorization |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2887439B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002052399A (en) * | 2000-08-10 | 2002-02-19 | Parker Engineering Kk | Chemical forming sludge dehydrating and drying apparatus |
| JP2006200250A (en) * | 2005-01-21 | 2006-08-03 | Okumura Corp | Mud disposal method of mud pressure shield driving |
| CN101691273B (en) * | 2009-09-28 | 2012-07-04 | 广州普得环保设备有限公司 | Method for integration of thickening, dehydration and aerobic air drying of sewage sludge |
| JP5176033B2 (en) * | 2010-02-24 | 2013-04-03 | Ｊｆｅエンジニアリング株式会社 | Sludge molding nozzle and band-type sludge dryer |
| JP5135369B2 (en) * | 2010-03-15 | 2013-02-06 | 株式会社東芝 | Sludge drying method |
| JP5561695B2 (en) * | 2010-06-23 | 2014-07-30 | Ｊｆｅエンジニアリング株式会社 | Molding nozzle for adhesive materials and band-type dryer |
| JP5379757B2 (en) * | 2010-07-22 | 2013-12-25 | Ｊｆｅエンジニアリング株式会社 | Sludge molding nozzle and band-type sludge dryer |
| JP5337924B1 (en) * | 2013-06-14 | 2013-11-06 | 株式会社神鋼環境ソリューション | Dewatered sludge molding machine |
| JP6527014B2 (en) * | 2015-05-08 | 2019-06-05 | メタウォーター株式会社 | Sludge dewatering and drying system |
| KR102390268B1 (en) * | 2021-10-25 | 2022-04-25 | 도요엔지니어링코리아 주식회사 | Drying system of sludge by reheating method using steam circulation |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5083854A (en) * | 1973-11-28 | 1975-07-07 | ||
| JP2662571B2 (en) * | 1987-07-21 | 1997-10-15 | 清水建設株式会社 | Seismic building structure |
-
1994
- 1994-02-10 JP JP6037899A patent/JP2887439B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07222999A (en) | 1995-08-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2887439B2 (en) | Method and apparatus for drying organic excess sludge with gas deodorization | |
| JPH11137950A (en) | Treatment of waste gas of hot drying process and more particularly sludge drying process of sewer sludge drying device and equipment for execution this method | |
| JPS6338240B2 (en) | ||
| JPH06234000A (en) | Method and device for drying sewage precipitate | |
| JP3406535B2 (en) | Method and apparatus for producing dry matter from wet organic waste | |
| JP2001192670A (en) | Method of manufacturing carbonized material and pyrolizer for organic waste | |
| US5175106A (en) | Method and apparatus for improving efficiency of fluid use and odor control in in-vessel composting systems | |
| JP2004097856A (en) | Equipment and method for waste liquid treatment | |
| JP3802161B2 (en) | Biological treatment of malodorous gases | |
| JP3609636B2 (en) | Sludge drying equipment | |
| JP3086198B2 (en) | Method and apparatus for treating wet organic waste | |
| JP2918109B1 (en) | Method and apparatus for treating wet organic waste | |
| US3622509A (en) | Mechanism and method for a char-recycling counterflow water clarifier | |
| KR100845962B1 (en) | Organic wastes disposal device and disposal method | |
| KR101610786B1 (en) | Complex dry method and dry system for reduce and reuse by non-heating dryer | |
| JP4380103B2 (en) | Manufacturing method and manufacturing equipment for aged compost-like material | |
| KR100289436B1 (en) | High concentration wastewater treatment method | |
| KR101549203B1 (en) | Reduce and reuse method for waste by non-heating dry system | |
| JPH0146200B2 (en) | ||
| JPH07119948A (en) | Integrated processing system for discharged water and waste material | |
| JP2000229276A (en) | Treatment of liquid-containing waste | |
| JP3510540B2 (en) | Odor treatment method and system for composting equipment | |
| JPS5910956B2 (en) | Composting method for organic waste | |
| JP2981076B2 (en) | Dewatering method for oil-water containing waste | |
| JPH0141398B2 (en) |