JPS58163500A - Dehydration of sludge - Google Patents

Abstract

PURPOSE:To obtain the effect of dehydration equivalent to a conventional one without the need to use a large driving means or a complex mechanism, by withdrawing purified water from a mixed liquid prepd. by adding a macromolecular flocculant to crude sludge through a strainer. CONSTITUTION:In crude sludge prepd. by mixing a macromolecular flocculant in it, suspended particles are flocculated and precipitated around a strainer 5 at the lower part of a filtering tank 4 by the macromolecular flocculant. By opening an opening 6 for withdrawing purified water, purified water is discharged through the withdrawing opening 6, while the flocculated sludge remains around the strainer 5. The flocculant to be used in this method may be one available on the market as a solution contg. 0.1% polyacrylamide, for instance. The strainer 5 may be a reticulated type having an aperture of about 1.0mm..

Description

【発明の詳細な説明】 本発明は下水道水等のスラッジ脱水に関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to sludge dewatering of sewage water and the like.

に記のような脱水に関しては従来遠心分離法。Conventional centrifugation methods are used for dehydration as described in .

ベルトプレス法等が主流を占めている。これらの場合遠
心分離法では下水道水の場合のような大量処理に対して
は当然設備は大がかりとなり動力費も大ｋ＜、ベルトプ
レス法、つまり運行する２枚のＰ布ベルトの間での濾過
方法も設備が大きくなると同時にベルトを頻繁に新替え
せねばならぬ等保守費もかさむことになる。本発明は処
理原水すなわち生スラツジに高分子凝集剤を混入し、ス
ラッジを凝集性でんさせ、この沈で−”ん層中においた
ストレーナより浄化水を抽出することによりスラッジ脱
水を行うという設備費のかさまない方法を提供するもの
である。The belt press method is the mainstream method. In these cases, the centrifugal separation method naturally requires large-scale equipment and high power costs for large-scale treatment of sewage water, and the belt press method, that is, filtration between two moving P cloth belts. This method also increases the size of the equipment and increases maintenance costs, such as frequent replacement of belts. The present invention is an equipment for dewatering sludge by mixing a polymer flocculant into treated raw water, that is, raw sludge, causing the sludge to coagulate, and extracting purified water from this sedimentation through a strainer placed in a sludge layer. It provides an inexpensive method.

第１図は本発明の方法を実施する装置の一例の概念図で
ある。１は生スラッジ人口、２は高分子凝集剤供給口、
３は前記２者をそれら管路の途中で混合するラインミキ
サー、４は上記のようにしてできた混合液が流入する沈
でん沢過槽、５は濾過槽４内下部におかれたストレーナ
、６はその始端をストレーナ５内に開く浄化水取出口、
７は槽４の底に設けられたスラッジ取出バルブ、８はス
トレーナ５に対する逆洗水の供給口である。高分子凝集
剤を混入された生スラツジでは浮遊粒子は高分子凝集剤
により沢過槽４の下部、ストレーナ５の囲りに凝集性で
んし、浄化水取出口６を開けば凝集スラッジはストレー
ナ５の囲りに残って浄化水は取出口６から排出される。FIG. 1 is a conceptual diagram of an example of an apparatus for carrying out the method of the present invention. 1 is the raw sludge population, 2 is the polymer flocculant supply port,
3 is a line mixer that mixes the two above in the middle of the pipe, 4 is a sedimentation filter tank into which the mixed liquid made as described above flows, 5 is a strainer placed at the lower part of the filter tank 4, 6 is a purified water outlet whose starting end opens into the strainer 5;
7 is a sludge take-out valve provided at the bottom of the tank 4, and 8 is a backwash water supply port to the strainer 5. In the case of raw sludge mixed with a polymer flocculant, the suspended particles will be coagulated in the lower part of the filtration tank 4 and around the strainer 5, and if the purified water outlet 6 is opened, the flocculated sludge will be transferred to the strainer. The purified water remaining around 5 is discharged from outlet 6.

凝集スラ、７ジＨａ［Ｉパルプ７により取出される。こ
の凝集剤は例えばアクリルアミド０．１％の溶液として
市販されているいわゆる凝集剤でよく、ストレーナには
第２図に示す１．０％程度の間隙の格子型のものでよい
。The agglomerated slurry is removed by 7 diHa[I pulp 7. This flocculant may be, for example, a so-called flocculant commercially available as a 0.1% acrylamide solution, and the strainer may be of the grid type with gaps of about 1.0% as shown in FIG.

以上のような本方法の効果を実験例２例を以て示す。The effects of this method as described above will be illustrated with two experimental examples.

第１例、　第３図。First example, Figure 3.

Ａ）条　件 生スラツジ容器 径９０％、高さ１，０００　ｎｙｎ ストレーナ 径６０％、高さ５０　Ｘｎ、　１．０間隙１５個の水平
格子。A) Conditions Raw sludge container diameter 90%, height 1,000 nyn Strainer diameter 60%, height 50 Xn, horizontal grid with 15 1.0 gaps.

容器底から７０％離してその中心線におく。Place it on the center line, 70% away from the bottom of the container.

凝集剤 ０．１％を混入した１１を原水１０１にまぜる。flocculant Mix 11 mixed with 0.1% into raw water 101.

浄化水取出し 容器底から滴下させる。Purified water extraction Drip from the bottom of the container.

Ｂ）スラッジ凝集の経時変化 （１）開始時 液面は管上端より１００％下。B) Time course of sludge aggregation (1) At the start The liquid level is 100% below the top of the tube.

（２）５分後 管上端より８５０　′ｙ、下る。原水とスラッジは同一
（８）１１分後 ４５０　Ｘｎまで下る。水抜けが先行しスラッジの沈下
速度が低下する。(2) After 5 minutes, descend 850'y from the top of the tube. Raw water and sludge descend to 450 Xn after the same (8) 11 minutes. Water drains first and the settling speed of sludge decreases.

（４）　４２分後 ５８５　′ｙｎまで下る。(4) 42 minutes later Descend to 585'yn.

（５）　４８分後 浄化水の滴下は粒径３〜５″Ｘｎで２秒毎位。(5) After 48 minutes The purified water is dripped every 2 seconds with a particle size of 3 to 5''Xn.

（６）　５５分後 ５１５％まで下る。以後水面の低下はとんどなし。(6) After 55 minutes It drops to 515%. Since then, the water level has hardly dropped.

振動を加えても同様、ストレーナ上方ではスラッジが寒
天状となっているのを、またストレーナと容器壁との間
ではスラッジが粒子状となっているのが認められる。Even when vibration is applied, it can be seen that the sludge is agar-like above the strainer, and that the sludge is particulate between the strainer and the container wall.

Ｃ）脱水効果 以上のようにして得られたスラッジは含水率８０．９％
であった。これは遠心分離法によるものとは！同じであ
る。C) Dehydration effect The sludge obtained as described above has a moisture content of 80.9%.
Met. This is due to centrifugation! It's the same.

第２例、　第４図。Second example, Figure 4.

Ａ）条　件 これは第１例と同じ装置、同じ混合液で、容器内混合液
面が低下するだけ液を補って行ったものである。A) Conditions This was carried out using the same equipment and the same mixed liquid as in the first example, with the liquid being supplemented to the extent that the level of the mixed liquid in the container had dropped.

Ｂ）経時的変化 ａは実験開始時の容器上端より１００′ｙｎの処の液面
の実験終了時、すなわち実験開始後７時間たった時の液
面、ｂは実験開始後４時間たった液を実験開始時の高さ
まで補充した時の液面の実験終了時の液面＋　　ｃＨ同
同時時間後ｄは同７時間後のものである。この実験で最
初は水抜けにスラッジと水とが出て来たが１０秒後には
スラッジは出なくなった。B) Change over time a is the liquid level at the end of the experiment, which is 100'yn from the top of the container at the start of the experiment, that is, 7 hours after the start of the experiment, and b is the liquid level 4 hours after the start of the experiment. The liquid level when refilled to the starting level is the liquid level at the end of the experiment + cH after the same time d is the same 7 hours later. In this experiment, sludge and water initially came out when the water drained, but sludge stopped coming out after 10 seconds.

Ｃ）脱水効果 スラッジのａ、ｂ、ｃ、ｄの各点における状態を含水率
で示せばａ　−９２，９％、ｂ−９８，２％、　　ｃ　
−９２，９％、ｄ−９２，６％であった。C) Dehydration effect The state of the sludge at points a, b, c, and d is expressed in terms of moisture content: a -92.9%, b -98.2%, c
-92.9%, d-92.6%.

以上かられかるように本発明方法によれば大きな動力的
装置や複雑な機構を要せず、しかも従来に匹敵する脱水
効果を得られるものである。As can be seen from the above, the method of the present invention does not require large power equipment or complicated mechanisms, and can achieve dehydration effects comparable to those of the conventional method.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本発明のスラッジの脱水方法に用いる脱水装置
の概念を示す説明図、第２図はストレーナの断面図、第
３図は実験例１の、第４図は実験例２の実験装置の何れ
も断面図である。 １　生スラツジ入口 ２　高分子凝集剤供給口 ３　生スラツジと凝集剤との混合用のラインミキサー ４　混合液の沈でん沢過槽 ５　濾過槽内下部のストレー− ６浄化水取出口 ア　スラッジ取出パルプ ８　ストレーナの逆洗水供給口 ａ　実験開始後７時間後の液面 ｂ　　　同　　４時間復液を始めの高さに補充した時の
実験終了時の液面 同　　５時間後　　　同上 ｄ　　　同　　７時間後　　　同上 出願人　三井造船株式会社 代理人　河田茂夫 茅３図 ′４２図 ）４図Figure 1 is an explanatory diagram showing the concept of the dewatering device used in the sludge dewatering method of the present invention, Figure 2 is a sectional view of the strainer, Figure 3 is the experimental apparatus of Experimental Example 1, and Figure 4 is the experimental apparatus of Experimental Example 2. Both are cross-sectional views. 1 Raw sludge inlet 2 Polymer flocculant supply port 3 Line mixer for mixing raw sludge and flocculant 4 Sedimentation filter tank for mixed liquid 5 Stray at the bottom of the filtration tank 6 Purified water outlet as Sludge take-out pulp 8 Strainer backwash water supply port a Liquid level b 7 hours after the start of the experiment Same liquid level at the end of the experiment after 4 hours of replenishing the condensate to the initial height 5 hours later Same as above d Same as above 7 hours later Same as above Applicant Mitsui Engineering & Shipbuilding Co., Ltd. Agent Shigeo Kawata Figure 3'42) Figure 4

Claims (1)

【特許請求の範囲】 生スラツジに高分子凝集剤を混入し、この混合液からス
トレーナを通じて浄化水を取出すスラ。 ジの脱水方法。[Claims] A sludge in which a polymer flocculant is mixed into raw sludge, and purified water is extracted from this mixture through a strainer. How to dehydrate ji.