JP2007244970A - Treatment method of soil coming from water purifying plant or sewage treatment plant - Google Patents

Treatment method of soil coming from water purifying plant or sewage treatment plant Download PDF

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JP2007244970A
JP2007244970A JP2006070260A JP2006070260A JP2007244970A JP 2007244970 A JP2007244970 A JP 2007244970A JP 2006070260 A JP2006070260 A JP 2006070260A JP 2006070260 A JP2006070260 A JP 2006070260A JP 2007244970 A JP2007244970 A JP 2007244970A
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soil
plant
generated soil
granulation
generated
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JP4810260B2 (en
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Masaru Kono
勝 河野
Eiichi Ito
永一 伊藤
Ryoji Omori
僚次 大森
Mitsuharu Tsuchiya
光晴 土屋
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SANPO RYOKKA KK
SEIBU ZOEN KK
Hitachi Ltd
Oji Forest Products Co Ltd
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SEIBU ZOEN KK
Hitachi Ltd
Oji Forest Products Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method for improving tone of color of soil coming from water purifying plant or sewage treatment plant. <P>SOLUTION: In the treatment method of the soil coming from the water purifying plant or the sewage treatment plant, the soil is granulated as it is or is granulated while a gelling agent or a thickener is blended. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、浄水場や下水処理場にて処理される河川水又は下水に浮遊物を、凝集沈殿することで発生する汚泥（これを発生土と呼ぶ）を処理する方法に関する。   The present invention relates to a method for treating sludge (referred to as generated soil) generated by coagulating and sedimenting suspended matter in river water or sewage treated at a water purification plant or a sewage treatment plant.

浄水場又は下水処理場で処理される河川水や下水は、多彩な有機物と無機物を含有するのが通例であって、これらの有機物や無機物が凝集沈殿した浄水場発生土及び下水処理場発生土は、これに必要に応じて肥料成分や土壌改良剤などを混合し、植物栽培用の土として利用されて来ている（特許文献１参照）   River water and sewage treated at a water treatment plant or sewage treatment plant usually contain a variety of organic and inorganic substances. Has been used as soil for plant cultivation by mixing fertilizer components, soil improvers and the like as necessary (see Patent Document 1).

元来日本では、森林に由来する黒土（黒褐色）や火山活動に由来する赤土（茶褐色）が、園芸用の土としてもてはやされて来た関係で、黒褐色ないしは茶褐色を呈する土が、園芸用の良質土として広く認識されている。然るに、上記のような発生土は、その固形分の大部分がシルトであるため、これを大気中に放置すると、灰青色ないしは灰緑色を呈する不都合がある。つまり、発生土に肥料成分や土壌改良剤を混合し、質的にも量的にも天然の黒土や赤土に匹敵する作り土を調製しても、その外観から良質土として認識されない場合が多い。
特許第３２６４９３８号 Originally in Japan, black soil (brown brown) derived from forests and red soil (brown brown) derived from volcanic activity have been used as gardening soils. Widely recognized as soil. However, since the most part of the solid content of the generated soil is silt, if it is left in the atmosphere, it has a disadvantage of exhibiting gray blue or gray green. In other words, even if fertilizer components and soil conditioners are mixed in the generated soil and a soil that is qualitatively and quantitatively comparable to natural black soil or red soil is prepared, it is often not recognized as high-quality soil due to its appearance. .
Japanese Patent No. 3264938

本発明は、大気中で放置すると灰青色ないしは灰緑色を呈する発生土の外観を、黒褐色ないしは茶褐色に呈色させる方法を提供する。一般に、発生土を積み上げて大気中に放置すると、大気に接して自然乾燥した発生土は、その色相がＲ〜Ｂ（マンセル表記）の範囲にあり、明度は３〜５（マンセル表記）の範囲になるのが通例である。本発明の処理方法によれば、３〜５（マンセル表記）の範囲にある発生土の当初の明度を、２（マンセル表記）以上低下させることができる。   The present invention provides a method for coloring the appearance of the generated soil, which is grayish blue or grayish green when left in the atmosphere, to blackish brown or brownish brown. Generally, when the generated soil is piled up and left in the atmosphere, the generated soil that is naturally dried in contact with the air has a hue in the range of R to B (Munsell notation), and the brightness is in the range of 3 to 5 (Munsell notation). It is customary to become. According to the processing method of the present invention, the initial brightness of the generated soil in the range of 3 to 5 (Munsell notation) can be reduced by 2 (Munsell notation) or more.

本発明が提案する発生土の処理方法のひとつは、浄水場又は下水処理場から得られる発生土を、如何なる助剤の共存しない条件下に、粒径５ｍｍ±３ｍｍの範囲に造粒することを特徴とする。
本発明に係る発生土処理方法の他のひとつは、発生土の造粒に先立ち、増粘剤又はゲル化剤を発生土の含水重量に対して0.5〜2.0重量％添加し、得られた混合物を粒径５ｍｍ±３ｍｍの範囲に造粒することを特徴とする。
この際、造粒土の表面水が1000ｍPa.s以上となるようにゲル化剤または増粘剤を添加することが望ましく、代表的なゲル化剤CMC製剤の1％溶液粘度表を下に記載する。 One of the methods for treating the generated soil proposed by the present invention is to granulate the generated soil obtained from the water treatment plant or the sewage treatment plant in a range of particle size of 5 mm ± 3 mm under the condition that no auxiliary agent coexists. Features.
Another one of the methods for treating generated soil according to the present invention is to add a thickener or gelling agent in an amount of 0.5 to 2.0% by weight based on the moisture content of the generated soil prior to granulation of the generated soil. Is granulated in a particle size range of 5 mm ± 3 mm.
At this time, it is desirable to add a gelling agent or a thickening agent so that the surface water of the granulated soil is 1000 mPa.s or more, and a 1% solution viscosity table of a typical gelling agent CMC formulation is described below. To do.

Figure 2007244970
Figure 2007244970

浄水場又は下水処理場から得られる発生土は、４０〜７５重量％の水分を含有し、残りの２５〜６０重量％は雑多な有機物及び粘土鉱物からなり、有機物は固形分の１５〜６０重量％（ＶＯＣ換算）を占める。そして、発生土中には鉄やマンガンなどの金属成分がイオンとして溶解しているほか、金属塩の形で有機物や粘土鉱物に含まれている。ちなみに、発生土を強制乾燥して得た固体を、王水で抽出し、抽出液の炎色反応から原子吸光法で鉄及びマンガンの含有量を測定すると、発生土は押し並べて、鉄又はマンガンのいずれか一方を０．１重量％以上含有する。   The generated soil obtained from the water purification plant or the sewage treatment plant contains 40 to 75% by weight of water, the remaining 25 to 60% by weight is composed of miscellaneous organic matter and clay minerals, and the organic matter is 15 to 60% by weight of solid content. % (VOC equivalent). In the generated soil, metal components such as iron and manganese are dissolved as ions, and are also contained in organic matter and clay minerals in the form of metal salts. By the way, the solid obtained by forced drying of the generated soil is extracted with aqua regia, and when the contents of iron and manganese are measured by atomic absorption from the flame reaction of the extract, Any one of these is contained 0.1% by weight or more.

本発明者等が得た知見によれば、適度に湿潤した発生土を、転動造粒又は振動造粒などの手段で粒径５ｍｍ±３ｍｍ程度の球形粒子に造粒して大気中に放置すると、その粒子群は、全体として黒味を帯びた外観を呈することが分かった。造粒された粒子が黒味を帯びて見えるのは、粒子内部から水分が表面に浸出して粒子表面に液膜が形成され、その液膜に溶存している鉄イオンやマンガンイオンが、空気中の酸素で酸化されるためと考えられる。この推測の真否は別にして、造粒前の発生土は、その明度が３〜５の範囲にあるが、造粒によってその明度を２以下に低下させ得ることを本発明者等は見出した。   According to the knowledge obtained by the present inventors, the moderately wet generated soil is granulated into spherical particles having a particle size of about 5 mm ± 3 mm by means of rolling granulation or vibration granulation and left in the atmosphere. Then, it turned out that the particle group exhibits a blackish appearance as a whole. The granulated particles appear blackish because moisture leaches out from the inside of the particles to form a liquid film on the surface of the particles, and iron ions and manganese ions dissolved in the liquid film form air. It is thought that it is oxidized by oxygen in it. Apart from the truth of this guess, the present inventors found that the lightness of the generated soil before granulation is in the range of 3 to 5, but the lightness can be lowered to 2 or less by granulation. .

浄水場又は下水処理場からの発生土は、大気中において灰青色ないしは灰緑色を呈するのが通常であるが、これを本発明の方法で処理することにより、その外見を茶褐色ないしは黒褐色に変化させることができる。ちなみに、東京都朝霞浄水場からの発生土は、色相Ｒ〜Ｂ（マンセル表記）、明度３〜５（マンセル表記）の範囲にあるが、この発生土を本発明の方法で処理することで、その色相はＲ〜Ｂ及びＮ（マンセル表記）に、明度は２（マンセル表記）以下に低下する。   The generated soil from the water treatment plant or sewage treatment plant usually has a grayish blue or grayish green color in the atmosphere. By treating this with the method of the present invention, the appearance is changed to brown or blackish brown. be able to. By the way, the generated soil from the Tokyo Asaka Water Treatment Plant is in the range of hues R to B (Munsell notation) and lightness 3 to 5 (Munsell notation), but by treating this generated soil with the method of the present invention, The hue decreases to R and B and N (Munsell notation), and the brightness decreases to 2 (Munsell notation) or less.

発生土の造粒には、転動造粒、振動造粒、押し出し造粒などのいずれかを採用することができ、造粒後の粒子の粒径は、５ｍｍ±３ｍｍ程度とすることが好ましい。転動造粒、振動造粒を採用した場合には、ほぼ球形の粒子が得られるのとは対照的に、押し出し造粒を採用した場合は円柱状の粒子が得られるが、この円柱状粒子の大きさは、円柱直径も円柱高さも共に５ｍｍ±３ｍｍ程度であることが好ましい。   For the granulation of the generated soil, any of rolling granulation, vibration granulation, extrusion granulation and the like can be employed, and the particle size of the granulated particles is preferably about 5 mm ± 3 mm. . When rolling granulation and vibration granulation are adopted, almost spherical particles are obtained, whereas when extruding granulation is adopted, cylindrical particles are obtained. It is preferable that both the diameter of the cylinder and the height of the cylinder are about 5 mm ± 3 mm.

本発明では、造粒に先立って発生土に増粘剤又はゲル化剤を配合することができる。増粘剤には、ポリアクリルアマイド製剤やグアーガムなどが使用でき、ゲル化剤には、CMC製剤などの非加熱で作用するものが使用できる。増粘剤及びゲル化剤の使用量は、造粒に供する発生土の含水量１００重量部当たりそれぞれ0.5〜2.0％重量部の範囲で選択される。   In the present invention, a thickener or a gelling agent can be added to the generated soil prior to granulation. As the thickener, a polyacrylamide preparation or guar gum can be used, and as the gelling agent, a non-heating agent such as a CMC preparation can be used. The amount of the thickener and the gelling agent used is selected in the range of 0.5 to 2.0% by weight per 100 parts by weight of the water content of the generated soil used for granulation.

Claims (4)

浄水場又は下水処理場に送られる原水中の浮遊物が凝集沈殿することで発生する発生土を、如何なる助剤も添加せずに、粒径５ｍｍ±３ｍｍの範囲に造粒することを特徴とする発生土の処理方法。   It is characterized by granulating the generated soil generated by the aggregation of floating substances in raw water sent to a water purification plant or sewage treatment plant into a particle size range of 5 mm ± 3 mm without adding any auxiliary agent. How to treat the generated soil. 発生土の造粒に先立ち、増粘剤又はゲル化剤を発生土の含水重量に対して0.5〜2.0％添加して造粒することを特徴とする請求項１記載の方法。   2. The method according to claim 1, wherein prior to granulation of the generated soil, granulation is carried out by adding 0.5 to 2.0% of a thickener or gelling agent with respect to the moisture content of the generated soil. 発生土の造粒に先立ち、鉄又はマンガンのいずれか一方を０．１重量％以上含有するよう場内プロセス中のろ過砂剥離酸化鉄・酸化マンガンを添加して造粒することを特徴とする請求項１記載の方法。   Prior to granulation of the generated soil, granulation is performed by adding filtered sand-peeled iron oxide / manganese oxide during the in-situ process so as to contain at least 0.1% by weight of either iron or manganese. Item 2. The method according to Item 1. 請求項１又は２記載の方法に従って処理した発生土に、堆肥を混合した植物栽培土壌。   A plant-cultivated soil obtained by mixing compost with the generated soil treated according to the method according to claim 1.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4474501B1 (en) * 2009-01-30 2010-06-09 三重県 Granulation system and granulation method
JP2020122142A (en) * 2019-01-30 2020-08-13 株式会社ハイクレー Planting soil-improving material, planting soil, method for manufacturing planting soil, and planting method

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JPS5293539A (en) * 1976-01-26 1977-08-06 Kondo Takahiko Growing material for crop
JPS5369127A (en) * 1976-11-09 1978-06-20 Chisso Corp Culture soil by utilizing soil provided from water purifying process as raw material
JPS5826294B2 (en) * 1980-03-05 1983-06-02 安子 中木 Seedling bed soil using purified water waste soil, etc.
JPH0975997A (en) * 1995-09-18 1997-03-25 Shinko Pantec Co Ltd Method for granulating dehydrated cake or the like and granulation device using it
JPH11314100A (en) * 1998-05-06 1999-11-16 Hitachi Zosen Corp Method for adjusting water content of sludge
JP2002305965A (en) * 2001-04-16 2002-10-22 Sumitomo Forestry Co Ltd Apparatus for producing plant growing medium, method for producing plant growing medium and plant growing medium
JP2002346598A (en) * 2001-05-28 2002-12-03 Electric Power Dev Co Ltd Granulated product of silt-like substance and method for manufacturing the same
JP2004008067A (en) * 2002-06-06 2004-01-15 Sumitomo Forestry Co Ltd Method for nutriculture of liquid supply control
JP2004329023A (en) * 2003-04-30 2004-11-25 Taisei Corp Paddy-rice raising-seedling culture soil

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5293539A (en) * 1976-01-26 1977-08-06 Kondo Takahiko Growing material for crop
JPS5369127A (en) * 1976-11-09 1978-06-20 Chisso Corp Culture soil by utilizing soil provided from water purifying process as raw material
JPS5826294B2 (en) * 1980-03-05 1983-06-02 安子 中木 Seedling bed soil using purified water waste soil, etc.
JPH0975997A (en) * 1995-09-18 1997-03-25 Shinko Pantec Co Ltd Method for granulating dehydrated cake or the like and granulation device using it
JPH11314100A (en) * 1998-05-06 1999-11-16 Hitachi Zosen Corp Method for adjusting water content of sludge
JP2002305965A (en) * 2001-04-16 2002-10-22 Sumitomo Forestry Co Ltd Apparatus for producing plant growing medium, method for producing plant growing medium and plant growing medium
JP2002346598A (en) * 2001-05-28 2002-12-03 Electric Power Dev Co Ltd Granulated product of silt-like substance and method for manufacturing the same
JP2004008067A (en) * 2002-06-06 2004-01-15 Sumitomo Forestry Co Ltd Method for nutriculture of liquid supply control
JP2004329023A (en) * 2003-04-30 2004-11-25 Taisei Corp Paddy-rice raising-seedling culture soil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4474501B1 (en) * 2009-01-30 2010-06-09 三重県 Granulation system and granulation method
JP2010172862A (en) * 2009-01-30 2010-08-12 Mie Prefecture Granulation system and method
JP2020122142A (en) * 2019-01-30 2020-08-13 株式会社ハイクレー Planting soil-improving material, planting soil, method for manufacturing planting soil, and planting method
JP7371831B2 (en) 2019-01-30 2023-10-31 株式会社ハイクレー Planting soil improvement material, planting soil, method for producing planting soil, and planting method

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