JPH0123200B2 - - Google Patents
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- Publication number
- JPH0123200B2 JPH0123200B2 JP55077870A JP7787080A JPH0123200B2 JP H0123200 B2 JPH0123200 B2 JP H0123200B2 JP 55077870 A JP55077870 A JP 55077870A JP 7787080 A JP7787080 A JP 7787080A JP H0123200 B2 JPH0123200 B2 JP H0123200B2
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- JP
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- Prior art keywords
- sludge
- water
- drying bed
- solar drying
- sand
- 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)
- Filtration Of Liquid (AREA)
Description
【発明の詳細な説明】 本発明は汚泥の脱水方法に関するものである。[Detailed description of the invention] The present invention relates to a method for dewatering sludge.
上工水道の浄水場、下水道終末処理場、し尿処
理施設、浄化槽、廃水処理施設等の水処理装置か
ら発生する汚泥は、一般に難沈降濃縮性、難脱水
性を示し、微細粒子を主成分とする懸濁物質を
5000mg／〜50000mg／程度含有している。こ
のことは汚泥に含有する水分が95〜99.5重量％に
も及ぶことを示す。上記各種の水処理装置から発
生する汚泥量は、原水中に含まれる懸濁物質量と
水処理薬剤の添加率あるいは生物処理の方法の違
いによつて変化するが、通常は水処理量の１〜２
重量％が汚泥として排出される。このような汚泥
の処理処分の円滑化は極めて重要である。汚泥は
原水中の汚濁成分の濃縮物であるため、無処理で
公共水域へ排出すれば水質環境を汚染して公害等
の原因になる。したがつて汚泥を減量化し、衛生
的に安定化し、最終処分地に固定させるかあるい
は資源として再利用する方法が一般にとられてい
る。 Sludge generated from water treatment facilities such as water treatment plants, sewerage treatment plants, human waste treatment facilities, septic tanks, and wastewater treatment facilities generally exhibits difficulty in sedimentation and concentration, and is difficult to dewater, and is mainly composed of fine particles. suspended solids
Contains about 5000mg/~50000mg/. This indicates that the water content in the sludge ranges from 95 to 99.5% by weight. The amount of sludge generated from the various types of water treatment equipment mentioned above varies depending on the amount of suspended solids contained in the raw water, the addition rate of water treatment chemicals, or the biological treatment method, but usually it is 1% of the water treatment amount. ~2
% by weight is discharged as sludge. Smooth treatment and disposal of such sludge is extremely important. Since sludge is a concentrate of pollutant components in raw water, if it is discharged into public waters without treatment, it will contaminate the water environment and cause pollution. Therefore, methods are generally used to reduce the amount of sludge, stabilize it sanitarily, and either fix it at a final disposal site or reuse it as a resource.
汚泥の減量化の方法としては脱水操作が一般的
である。しかしながら汚泥の水分を取り除くこと
は容易なことではなく、従来から各種の方法が考
案されて試みられてきたが、どの方法も一長一短
があり、より安価に効率よく汚泥を脱水しうる方
式の出現が待たれている。 Dewatering is a common method for reducing the amount of sludge. However, it is not easy to remove water from sludge, and various methods have been devised and tried in the past, but each method has advantages and disadvantages, and it is hoped that a method that can dewater sludge more efficiently and at a lower cost will emerge. Waiting.
もつとも古くから利用されている汚泥の脱水方
法は天日乾燥床による方法であるが、広大な敷地
を必要とすることと、臭気の発生などの欠点があ
るため、最近ではあまり用いられなくなつた。し
かしながら天日乾燥床による方法は太陽エネルギ
ーを使用するので、省エネルギーが叫ばれている
今日においては再度見なおす必要が生じている。 The method of dewatering sludge that has been used for a long time is the method using a solar drying bed, but it has become less popular recently because it requires a vast area and has drawbacks such as the generation of odors. . However, since the solar drying bed method uses solar energy, there is a need to reconsider it now that energy conservation is in demand.
従来の天日乾燥床は、上部開放型で高さが低い
が底面積の大きい構造をした、コンクリート製な
どの槽からなり、このような天日乾燥床に汚泥を
張り込み、そのまま放置して太陽エネルギーによ
つて汚泥の水分を蒸発させ、汚泥を乾燥させるも
のであるが、単位面積当りの汚泥処理量が少な
く、また乾燥に長期間を要し、天候によつてはさ
らにその期間が延長するなど、効率が全く悪い。
また、この他の天日乾燥床に上部開放型で底面積
の大きいコンクリート製などの槽に砂、小砂利、
土壌あるいは合成粒状物などを敷きつめた過層
を有するものがあり、当該天日乾燥床の過層の
上方に汚泥を張り込み、そのまま放置して汚泥を
重力脱水し、過層の下部の集水機構から汚泥の
水分の一部を排水するとともに、太陽エネルギー
によつても水分を蒸発させて、汚泥を脱水乾燥す
るものもあるが、汚泥は前述したように一般に難
沈降濃縮性、難脱水性であるので、実際には重力
脱水しにくく、重力脱水を行なわない前述の従来
の天日乾燥床と比べて、敷地面積当りの処理量も
それ程増大させることができず、脱水乾燥に長期
間を必要とするという欠点がある。 Conventional solar drying beds consist of a tank made of concrete or other material with an open top, low height, and large bottom area.Sludge is poured into such a solar drying bed and left to dry in the sun. This method uses energy to evaporate water in sludge and dry it, but the amount of sludge treated per unit area is small and it takes a long time to dry, which can be extended depending on the weather. etc. is completely inefficient.
In addition, sand, small gravel,
Some types have an overlayer filled with soil or synthetic granules, and sludge is placed above the overlayer of the solar drying bed, left as it is, and the sludge is dehydrated by gravity, creating a water collection mechanism below the overlayer. In some cases, sludge is dehydrated and dried by draining some of the water from the sludge and evaporating the water using solar energy, but as mentioned above, sludge is generally difficult to settle and thicken, and is difficult to dewater. Therefore, gravity dehydration is actually difficult, and compared to the conventional solar drying bed mentioned above that does not perform gravity dehydration, the processing amount per site area cannot be increased that much, and dehydration and drying require a long period of time. There is a drawback that.
また従来から汚泥に、その汚泥に適したカチオ
ン性、アニオン性あるいはノニオン性の有機高分
子凝集剤を適当量添加することにより、汚泥を凝
集させ、脱水性を向上させることができるのは公
知であるが、このように有機高分子凝集剤を添加
して脱水性を向上させた汚泥を前述したような、
過層を有する天日乾燥床に単に張り込んだので
は以下に説明するような不具合が生ずる。すなわ
ち第１図に示した従来の天日乾燥床１は上部開放
型でその底部が傾斜しているコンクリート製など
の槽２に過層として、砂利３を厚さ約10〜20cm
に敷き、さらにその上方に砂４を厚さ約30〜50cm
に敷いてあり、また槽２の最底部に集水管５を設
け、当該集水管５に単に排水管６を接続し、また
槽２の上方の一角に汚泥流入口８を接続してあ
る。 Furthermore, it has been known that by adding an appropriate amount of a cationic, anionic or nonionic organic polymer flocculant suitable for the sludge to the sludge, it is possible to flocculate the sludge and improve its dewatering properties. However, sludge with improved dewatering properties by adding an organic polymer flocculant is
If a solar drying bed with an overlayer is simply covered, the following problems will occur. That is, the conventional solar drying bed 1 shown in Fig. 1 is an overlayer of gravel 3 in a tank 2 made of concrete or the like with an open top and a sloping bottom, and a layer of gravel 3 about 10 to 20 cm thick.
, and then add sand 4 to a thickness of about 30 to 50 cm above it.
A water collection pipe 5 is provided at the bottom of the tank 2, a drain pipe 6 is simply connected to the water collection pipe 5, and a sludge inlet 8 is connected to an upper corner of the tank 2.
しかし、このような天日乾燥床１の過層に汚
泥流入口８から、あらかじめ凝集剤を添加した汚
泥を単に流入させたのでは、汚泥が凝集して脱水
性が向上しているので、直ちに汚泥の重力脱水が
始まり、汚泥の過水は槽２内に滞留することな
く、砂４および砂利３を流下して集水管５を経て
排水管６より流出するので、その後流入する汚泥
の重力脱水が継続して行なわれ、脱水ケーキ７は
汚泥流入口８を中心に放射状に広がりながら堆積
するが、汚泥流入口８付近Ａが最も厚く、所定の
脱水ケーキの厚みとなる。このため当該汚泥流入
口８から離れるにしたがつて薄い脱水ケーキ７が
形成してしまい、汚泥流入口８付近Ａの汚泥の厚
みが側壁の高さとほぼ同一となる点で汚泥の供給
を止めた場合、汚泥が汚泥流入口８から最遠部の
砂４上まで展開せず、汚泥供給口８より遠方の床
Ｂに砂４が一部露出したままとなる。このよう
に、たとえ汚泥に高分子凝集剤を添加しても脱水
方法が適切でないと、天日乾燥床１の敷地面積が
有効利用されず、単位面積当りの汚泥の処理量が
少なくなる。 However, if sludge to which a flocculant has been added in advance is simply flowed into the overlayer of the solar drying bed 1 from the sludge inlet 8, the sludge will flocculate and the dewatering properties will be improved. Gravity dewatering of the sludge begins, and the excess water in the sludge does not stay in the tank 2, but flows down the sand 4 and gravel 3, passes through the water collection pipe 5, and flows out from the drain pipe 6, so that the sludge that flows in thereafter is dehydrated by gravity. is continuously carried out, and the dewatered cake 7 is deposited while spreading radially around the sludge inlet 8, but the area A near the sludge inlet 8 is thickest and has a predetermined thickness of the dehydrated cake. For this reason, a thinner dewatered cake 7 was formed as the distance from the sludge inlet 8 increased, and the sludge supply was stopped at the point where the thickness of the sludge near the sludge inlet 8 A became almost the same as the height of the side wall. In this case, the sludge does not spread from the sludge inlet 8 to the farthest part of the sand 4, and a portion of the sand 4 remains exposed on the floor B farther from the sludge supply port 8. As described above, even if a polymer flocculant is added to the sludge, if the dehydration method is not appropriate, the site area of the solar drying bed 1 will not be used effectively, and the amount of sludge treated per unit area will decrease.
またこのような不具合を解決し、脱水ケーキを
所定の均一な厚さに形成するために、汚泥を１つ
の汚泥流入口から流入させるのではなく、汚泥流
入口を均等な間隔で複数個設置し、天日乾燥床に
あらかじめ凝集剤を添加した汚泥を複数の汚泥流
入口から均等に分配して流入させることも考えら
れるが、複雑な設備を必要とするとともに、天日
乾燥後の脱水ケーキを人手によつて掻き寄せて搬
出する際、複数の汚泥流入口が邪魔となつて作業
が困難になるという問題が生ずる。 In addition, in order to solve this problem and form a dehydrated cake with a predetermined uniform thickness, multiple sludge inlets are installed at equal intervals instead of allowing the sludge to flow in from one sludge inlet. It is also possible to evenly distribute and flow sludge to which a flocculant has been added in advance into a solar drying bed from multiple sludge inlets, but this would require complicated equipment and would make it difficult to maintain the dewatered cake after sun drying. When manually raking and transporting sludge, a problem arises in that the multiple sludge inlets become an obstacle, making the work difficult.
本発明は以上のような従来方法の欠点を解決す
るものであり、敷地面積当りの処理量を増加させ
るとともに、脱水時間を短縮し、かつ含水率の低
い脱水汚泥ケーキを得ることを目的とする。すな
わち本発明は過層を有する天日乾燥床に有機高
分子凝集剤を添加した汚泥を流入して汚泥の脱水
をするにあたり、当該汚泥を過層上に導入した
際に過層を通過して流出する過水の流出を遮
断したうえで当該汚泥の流入を行ない、当該汚泥
を過層上の全面に所定の厚さに張り込んだ時点
で、前記汚泥の過水の流出を行なうことを特徴
とする。 The present invention solves the drawbacks of the conventional methods as described above, and aims to increase the throughput per site area, shorten the dewatering time, and obtain a dehydrated sludge cake with a low water content. . That is, in the present invention, when sludge to which an organic polymer flocculant has been added is introduced into a solar drying bed having an overlayer and the sludge is dehydrated, when the sludge is introduced onto the overlayer, the sludge passes through the overlayer. The method is characterized in that the sludge is allowed to flow in after blocking the outflow of superfluous water, and when the sludge is spread over the entire surface of the superlayer to a predetermined thickness, the superfluous water of the sludge is allowed to flow out. shall be.
以下に本発明を詳細に説明する。 The present invention will be explained in detail below.
第２図は本発明の実施態様の一例を示した横断
面説明図であり、天日乾燥床１の排出管６に弁９
を付設した以外、その他の符号は第１図と同一で
あるので、その説明は省略する。 FIG. 2 is an explanatory cross-sectional view showing an example of an embodiment of the present invention, in which a valve 9 is installed in the discharge pipe 6 of the solar drying bed 1.
Since the other symbols are the same as in FIG. 1 except for the addition of , their explanation will be omitted.
本天日乾燥床１において汚泥を天日乾燥するに
あたり、まず排出管６の弁９を閉じ、前述したよ
うにあらかじめ有機高分子凝集剤を添加した汚泥
を汚泥流入口８より砂４と砂利３で形成した過
層上に流入させる。汚泥は凝集して、脱水性が向
上しており、流入の初期においては汚泥中の水は
直ちに重力脱水し、その過水は砂４および砂利
３を流下するが、弁９を閉じて過水の流出を遮
断しているので、過水の水位が砂利３、砂４と
上昇し、ついには過層である砂４の表面まで水
位が上昇する。そしてその後流入する汚泥はスラ
リー状態となるので、過層である砂４上に汚泥
を展開し、均一の厚さの汚泥層を形成させること
ができる。その後天日乾燥床１の過層上の全面
に汚泥を所定の厚さに均一に張り込んだ時点で、
排出管６の弁９を開け天日乾燥床の過層の全面
に汚泥スラリーが存在するようにして過水を集
水管５を経て排出管６より流出させる。 In order to dry the sludge in the sun in the solar drying bed 1, first, the valve 9 of the discharge pipe 6 is closed, and the sludge to which an organic polymer flocculant has been added in advance as described above is poured into the sludge inlet 8 through the sand 4 and gravel 3. Flow onto the superlayer formed by . The sludge coagulates and has improved dewatering properties. At the beginning of the inflow, the water in the sludge is immediately dehydrated by gravity, and the excess water flows down the sand 4 and gravel 3, but the valve 9 is closed and the water is removed. Since the outflow of sand 4 is blocked, the water level of overwater rises to gravel 3 and sand 4, and finally reaches the surface of sand 4, which is an overlayer. Then, since the sludge that flows in becomes a slurry state, it is possible to spread the sludge on the overlayer of sand 4 and form a sludge layer with a uniform thickness. After that, when the sludge is uniformly spread over the entire surface of the overlayer of the solar drying bed 1 to a predetermined thickness,
The valve 9 of the discharge pipe 6 is opened so that the sludge slurry is present on the entire surface of the overlayer of the solar drying bed, and the excess water is discharged from the discharge pipe 6 through the water collection pipe 5.
このような方法により一部分に汚泥が片寄るこ
となく砂４全面に脱水ケーキ７を均一な厚さで堆
積させることができる。脱水ケーキ７が徐々にそ
の厚さを増し、所定の厚さになつたら、汚泥の流
入を止める。また弁９は開けたままとし、その後
流出する過水を排出管６より排出させる。 By such a method, the dewatered cake 7 can be deposited to a uniform thickness on the entire surface of the sand 4 without the sludge being concentrated in one part. The thickness of the dehydrated cake 7 gradually increases, and when it reaches a predetermined thickness, the inflow of sludge is stopped. Further, the valve 9 is left open, and the overflowing water is then discharged from the discharge pipe 6.
このようにあらかじめ有機高分子凝集剤を添加
した汚泥を張り込むと、高分子凝集剤の作用によ
り汚泥の過性が向上するので張り込みながら
過水を排出させることができ、凝集剤を添加しな
い従来方法に比べて、約３〜10倍量の汚泥を張り
込むことができる。また本発明の他の方法として
排出管６の弁９を閉じ、あらかじめ有機高分子凝
集剤を添加した汚泥を天日乾燥床１の槽２内に流
入させ、汚泥が過層である砂４の全面に展開し
たのちさらに汚泥の流入を続け、汚泥を槽２の上
限近くまで張り込む。次に弁９を開け、たとえば
流入する汚泥量よりできるだけ多い流量の過水
を排出管６より流出させて重力脱水を行ない、
過層である砂４の全面に、うすい均一な厚みの脱
水ケーキ７′を形成させ、次に弁９を閉じ、汚泥
をすでに堆積した脱水ケーキ７′の全面で、かつ
槽２の上限近くまで張り込み、そして前述したよ
うに再び弁９を開け、重力脱水を行ない、すでに
堆積した脱水ケーキ７′の上にうすい均一な厚み
の脱水ケーキ７″を上積みさせ、このような汚泥
の張り込みと重力脱水を交互に繰返えすことによ
つても、前述したような所定の均一の厚みを有す
る脱水ケーキ７を形成させることができる。 When sludge to which an organic polymer flocculant has been added in advance is poured in this way, the action of the polymer flocculant improves the permeability of the sludge, allowing the excess water to be discharged while the sludge is being poured. Approximately 3 to 10 times the amount of sludge can be loaded compared to the conventional method. In another method of the present invention, the valve 9 of the discharge pipe 6 is closed, and the sludge to which an organic polymer flocculant has been added is allowed to flow into the tank 2 of the solar drying bed 1. After spreading the sludge over the entire surface, the sludge continues to flow in until the sludge reaches the upper limit of the tank 2. Next, the valve 9 is opened and, for example, excess water with a flow rate as much as possible than the amount of inflowing sludge is allowed to flow out from the discharge pipe 6 to perform gravity dewatering.
A thin, uniformly thick dewatered cake 7' is formed on the entire surface of the overlayered sand 4, and then the valve 9 is closed, and sludge is poured over the entire surface of the dehydrated cake 7' on which sludge has already been deposited and up to near the upper limit of the tank 2. Then, as described above, the valve 9 is opened again to perform gravity dewatering, and a thin, uniformly thick dehydrated cake 7'' is piled up on top of the already deposited dehydrated cake 7'. By repeating the steps alternately, the dehydrated cake 7 having a predetermined uniform thickness as described above can be formed.
このようにして形成した脱水ケーキ７を、たと
えば数日から数週間放置し、太陽エネルギーによ
つて脱水ケーキ７に残留する水分を蒸発させる
が、すでに脱水ケーキ７を十分に重力脱水してい
るので、天日乾燥において、短期間でさらに含水
率の低下した脱水ケーキ７を得ることができる。 The dehydrated cake 7 thus formed is left to stand, for example, for several days to several weeks, and the moisture remaining in the dehydrated cake 7 is evaporated by solar energy, but since the dehydrated cake 7 has already been sufficiently dehydrated by gravity, By drying in the sun, a dehydrated cake 7 with a further reduced moisture content can be obtained in a short period of time.
また天日乾燥した脱水ケーキ７はたとえばフオ
ーク、スコツプなどを用い、人手によつて容易に
掻き寄せて搬出することが可能となる。 Further, the sun-dried dehydrated cake 7 can be easily scooped up manually using a fork, a scoop, etc., and carried out.
なお、本実施態様において、汚泥の過水を遮
断する手段として天日乾燥床１の排出管６に弁９
を設けたが、流下水を１時的に遮断することがで
きるものであればどのような構造であつてもよ
い。また天日乾燥床１の過層として砂４および
砂利３を用いたが、この他に合成粒状物あるいは
砂の上に布などを敷いて用いてもよい。また本
発明において添加する有機高分子凝集剤は汚泥の
成分により異なるが、カチオン系としてジシアン
ジアミド、ポリアミン、ポリメタクリル酸エステ
ル、メタクリル酸エステルとアクリルアミドの共
重合物あるいはキトサンなどを使用し、またノニ
オン系としてポリアクリルアミドなどを使用し、
またアニオン系としてアクリルアミドの部分加水
分解物、ポリアクリル酸ソーダなどを使用すると
よい。また当該凝集剤の添加量は汚泥中の固形分
に対して、たとえば0.05〜２重量％とするのが好
ましい。 In addition, in this embodiment, a valve 9 is installed in the discharge pipe 6 of the solar drying bed 1 as a means to shut off overwatering of the sludge.
However, any structure may be used as long as it can temporarily block flowing water. Further, although sand 4 and gravel 3 were used as the overlayer of the solar drying bed 1, synthetic granules or cloth or the like may be spread over the sand. The organic polymer flocculants added in the present invention vary depending on the components of the sludge, but cationic ones such as dicyandiamide, polyamines, polymethacrylic esters, copolymers of methacrylic esters and acrylamide, or chitosan are used, and nonionic ones are used. using polyacrylamide etc. as
Further, as an anionic material, a partial hydrolyzate of acrylamide, sodium polyacrylate, etc. may be used. Further, it is preferable that the amount of the flocculant added is, for example, 0.05 to 2% by weight based on the solid content in the sludge.
以上述べたように、本発明はあらかじめ有機高
分子凝集剤を添加した汚泥を天日乾燥床に張り込
むとともに、当該汚泥を張り込むにあたり、過
水の流出を止め、汚泥が当該床の全面に展開した
時点で過水を流出させるので、汚泥を効率よく
重力脱水することができるとともに、天日乾燥床
の全面に均一な厚さの脱水ケーキを形成すること
ができ、天日乾燥床の単位面積当りの処理量を増
大させることができる。 As described above, the present invention involves placing sludge to which an organic polymer flocculant has been added in advance onto a solar drying bed, and when placing the sludge, the outflow of excess water is stopped, and the sludge is spread over the entire surface of the bed. Since the excess water flows out at the time of expansion, the sludge can be efficiently dehydrated by gravity, and a dehydrated cake with a uniform thickness can be formed on the entire surface of the solar drying bed, making it possible to The amount of processing per area can be increased.
また本発明は十分に重力脱水した脱水ケーキを
天日乾燥するので、所定の含水率に到達するまで
の期間を大幅に短縮することができるとともに、
含水率の低い脱水ケーキを得ることができる。ま
た悪臭の発生が少なく、さらに天日乾燥中に雨が
降つても、雨は直ちに脱水ケーキを浸透して流下
するので、雨による影響は少なく、従来のように
天日乾燥中の汚泥の上に降雨が貯まり、乾燥に要
する期間が大幅に延長することを防止することが
できる。 Furthermore, in the present invention, since the dehydrated cake that has been sufficiently dehydrated by gravity is dried in the sun, it is possible to significantly shorten the period until the predetermined moisture content is reached, and
A dehydrated cake with a low moisture content can be obtained. In addition, there is little odor generation, and even if it rains during sun drying, the rain immediately penetrates the dehydrated cake and flows down, so there is little impact from the rain, and it is not possible to overflow the sludge during sun drying as in the past. This can prevent rain from accumulating and significantly prolonging the drying period.
以下に本発明の実施例について説明する。 Examples of the present invention will be described below.
実施例
本実施例で使用した天日乾燥床は、上部開放型
で、その横断面が長辺15ｍ、短辺５ｍの長方形で
あり、また当該床の下方に直径約１〜３cmの砂利
を高さ約10cmに敷き、その上方に砂を高さ約40cm
に敷いてあり、また当該床の最底部に集水管を設
け、当該集水管には弁を有する排出管を接続し、
また砂の表面より上方の天日乾燥床の高さは約30
cmを有するものである。Example The solar drying bed used in this example had an open top and a rectangular cross section with a long side of 15 m and a short side of 5 m, and gravel with a diameter of about 1 to 3 cm was placed under the bed. Spread it to a height of about 10cm, and then add sand to a height of about 40cm above it.
A water collection pipe is installed at the bottom of the floor, and a discharge pipe with a valve is connected to the water collection pipe.
The height of the solar drying bed above the sand surface is approximately 30
cm.
まず天日乾燥床の排出管の弁を閉じ、あらかじ
め含水率97重量％の消化汚泥に、メタクリル酸エ
ステルとアクリルアミドの共重合を主成分とする
オルフロツク（登録商標）OX−148（オルガノ社
製）を５Kg／ｔ−固形分添加しながら、この汚泥
を当該床の一角から30m3／hrで張り込んだ。汚泥
が砂上の全面に展開し、その厚さ20cmとなつた時
点で汚泥の流入を止め、排出管の弁を開けて流下
水を排出管より流出させて汚泥を重力脱水した。
汚泥の重力脱水は短時間で終了し、砂上にほぼ均
一な厚さの脱水ケーキを形成することができた。
次に再び弁を閉じ、前述したようにあらかじめ凝
集剤を添加した汚泥を新しく流入させ、汚泥が展
開して前回の脱水ケーキも加えた厚さが約20cmと
なつた時点で汚泥の流入を止め、排出管の弁を開
けて汚泥の重力脱水を行なつた。 First, close the valve of the discharge pipe of the solar drying bed, and add Olufrock (registered trademark) OX-148 (manufactured by Organo Co., Ltd.), whose main component is a copolymer of methacrylic acid ester and acrylamide, to the digested sludge with a water content of 97% by weight. This sludge was poured from one corner of the floor at a rate of 30 m 3 /hr while adding 5 kg/t of solids. When the sludge spread over the entire surface of the sand and reached a thickness of 20 cm, the inflow of sludge was stopped, the valve of the discharge pipe was opened, and the flowing water was allowed to flow out from the discharge pipe, thereby dewatering the sludge by gravity.
Gravity dewatering of the sludge was completed in a short time, and a dehydrated cake of approximately uniform thickness could be formed on the sand.
Next, close the valve again and let a new flow of sludge to which a flocculant has been added in advance as described above, stop the flow of sludge when the sludge expands and reaches a thickness of approximately 20 cm (including the previous dewatered cake). Then, the valve of the discharge pipe was opened to perform gravity dewatering of the sludge.
このような汚泥の張り込みと、汚泥の重力脱水
を交互に数回繰返えしたところ、天日乾燥床の全
面に約20cmの均一の厚さを有する脱水ケーキを形
成することができた。また汚泥の処理量は75m3で
あつた。なお、脱水ケーキをそのまま放置して天
日乾燥したところ、６日後に含水率が62重量％の
脱水ケーキを得た。 By repeating this sludge filling and gravity dehydration of the sludge several times alternately, a dehydrated cake with a uniform thickness of about 20 cm could be formed over the entire surface of the solar drying bed. The amount of sludge treated was 75m3 . When the dehydrated cake was left to dry in the sun, a dehydrated cake with a water content of 62% by weight was obtained after 6 days.
また、比較のため、排出管に弁を有しない他は
本発明方法と同じ構造である天日乾燥床に、本発
明方法と同じ条件で、あらかじめ消化汚泥に凝集
剤を添加し、その汚泥を当該床の一角から30m3／
hrで流入させたところ、汚泥は天日乾燥床に流入
すると同時に重力脱水され、その脱水ケーキは汚
泥の流入口付近から堆積し始めた。そして流入口
付近の脱水ケーキの厚みが約20cmとなつた時点で
汚泥の流入を止めたが、脱水ケーキは流入口から
離れるにしたがつて徐々にうすくなり、最遠部に
おいて全く脱水ケーキが堆積しないところが約
1.5m2あつた。また汚泥の処理量は40m3であつた。
なお、脱水ケーキをそのまま放置して天日乾燥し
たところ、６日後に平均した含水率が61重量％の
脱水ケーキを得た。 For comparison, a coagulant was added to the digested sludge in advance under the same conditions as the method of the present invention, and the sludge was dried in a solar drying bed that had the same structure as the method of the present invention except that the discharge pipe did not have a valve. 30m3 /from one corner of the floor
hr, the sludge was dehydrated by gravity as soon as it entered the solar drying bed, and the dehydrated cake started to accumulate near the sludge inlet. The inflow of sludge was stopped when the thickness of the dehydrated cake near the inlet reached approximately 20 cm, but the dehydrated cake gradually became thinner as it moved away from the inlet, and no dehydrated cake was deposited at the farthest point. The part where it doesn't is about
1.5m 2 hot. The amount of sludge treated was 40m3 .
When the dehydrated cake was left to dry in the sun, a dehydrated cake with an average moisture content of 61% by weight was obtained after 6 days.
以上の結果から天日乾燥床の単位面積当りの汚
泥の処理量が比較実験では16Kg−乾燥固形物／m2
（2.6Kg−乾燥固形物／m2・日）であるのに比較し
て本発明方法では30Kg−乾燥固形分／m2（５Kg−
乾燥固形分／m2・日）と、その処理量を大幅に増
加させることができた。 From the above results, the amount of sludge treated per unit area of the solar drying bed was 16 kg - dry solids/m 2 in the comparative experiment.
(2.6Kg-dry solids/ m2 -day), compared to 30Kg-dry solids/ m2 (5Kg-day) in the method of the present invention.
It was possible to significantly increase the dry solid content/m 2 ·day) and the throughput.
なお、本発明方法と比較実験は同時に開始し、
天日乾燥を行なつた６日間は降雨がなく、湿度が
60〜75％の範囲であつた。 The method of the present invention and the comparative experiment were started at the same time.
There was no rain during the 6 days of sun drying, and the humidity was low.
It was in the range of 60-75%.
第１図は従来の天日乾燥床の横断面説明図であ
り、第２図は本発明に用いる天日乾燥床の横断面
説明図である。
１……天日乾燥床、２……槽、３……砂利、４
……砂、５……集水管、６……排出管、７……脱
水ケーキ、８……汚泥流入口、９……弁。
FIG. 1 is a cross-sectional explanatory diagram of a conventional solar drying bed, and FIG. 2 is a cross-sectional explanatory diagram of a solar drying bed used in the present invention. 1...sun drying bed, 2...tank, 3...gravel, 4
... sand, 5 ... water collection pipe, 6 ... discharge pipe, 7 ... dehydrated cake, 8 ... sludge inlet, 9 ... valve.
Claims (1)
剤を添加した汚泥を流入して汚泥の脱水をするに
あたり、当該汚泥を過層上に導入した際に過
層を通過して流出する過水の流出を遮断したう
えで当該汚泥の流入を行ない、当該汚泥を過層
上の全面に所定の厚さに張り込んだ時点で、前記
汚泥の過水の流出を行なうことを特徴とする汚
泥の脱水方法。1. When dewatering sludge by flowing sludge added with an organic polymer flocculant into a solar drying bed with a superlayer, when the sludge is introduced onto the superlayer, the excess water that flows out through the superlayer is A sludge characterized in that the sludge is introduced after blocking the outflow of water, and when the sludge is spread over the entire surface of the superlayer to a predetermined thickness, the excess water of the sludge is allowed to flow out. Dehydration method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7787080A JPS5724700A (en) | 1980-06-11 | 1980-06-11 | Dewatering of sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7787080A JPS5724700A (en) | 1980-06-11 | 1980-06-11 | Dewatering of sludge |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5724700A JPS5724700A (en) | 1982-02-09 |
| JPH0123200B2 true JPH0123200B2 (en) | 1989-05-01 |
Family
ID=13646082
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7787080A Granted JPS5724700A (en) | 1980-06-11 | 1980-06-11 | Dewatering of sludge |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5724700A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04274061A (en) * | 1991-02-28 | 1992-09-30 | Olympus Optical Co Ltd | Digital signal reproducing device |
| JPH0528659A (en) * | 1991-05-16 | 1993-02-05 | Olympus Optical Co Ltd | Digital signal reproducing device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5364949A (en) * | 1976-11-20 | 1978-06-09 | Ebara Infilco Co Ltd | Method of filtering by hydroextration |
-
1980
- 1980-06-11 JP JP7787080A patent/JPS5724700A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5724700A (en) | 1982-02-09 |
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