JP5378301B2 - Construction sludge treatment method and reclaimed sand from construction sludge - Google Patents

Construction sludge treatment method and reclaimed sand from construction sludge Download PDF

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JP5378301B2
JP5378301B2 JP2010129707A JP2010129707A JP5378301B2 JP 5378301 B2 JP5378301 B2 JP 5378301B2 JP 2010129707 A JP2010129707 A JP 2010129707A JP 2010129707 A JP2010129707 A JP 2010129707A JP 5378301 B2 JP5378301 B2 JP 5378301B2
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宏彰 中村
友一朗 弘瀬
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太平産業株式会社
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    • 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
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment method of construction sludge for reclaiming sand which contains many fine grains and suitable for soil cement production and backfill sand of good quality, which is obtained by washing the fine grains with clear water, from construction sludge, and reclaimed sand from the construction sludge. <P>SOLUTION: In the treatment method of the construction sludge, after removing gravel having a predetermined size from crushed sludge water 4 obtained by crushing the construction sludge 1, crushed sludge water 6, from which the gravel has been removed, is classified using a grain size of about 74 &mu;m as a classification point by a liquid cyclone 7 to obtain thickened crushed sludge water 8 in which sand is thickened so as to hold the fine grains comprising silt and clay, the thickened crushed sludge water 8 is solid-liquid-separated to obtain reclaimed fine grain sand 11 containing many fine grains and water 12, and the reclaimed fine grain sand 11 containing many fine grains is washed with washing water 22 to remove the fine grains and then solid-liquid-separated to obtain washed reclaimed sand 26, from which the fine grains have been removed, and water 27. The reclaimed sand is obtained by the treatment method. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

本発明は、各種の建設工事や土木工事から大量に発生する建設汚泥の有効利用と建設汚泥の減容化を図るとともに、建設汚泥から細粒分を多く含むソイルセメント製造に適した砂と、細粒分を清水で洗浄した良質な埋め戻し砂を再生するための建設汚泥の処理方法及び建設汚泥からの再生砂に関するものである。   The present invention aims at effective use of construction sludge generated in large quantities from various construction works and civil engineering works and volume reduction of construction sludge, and sand suitable for manufacturing soil cement containing a large amount of fine particles from construction sludge; The present invention relates to a method for treating construction sludge for regenerating high quality backfill sand whose fine particles have been washed with fresh water, and to reclaimed sand from construction sludge.

建設汚泥とは、各種の建設工事や土木工事にかかる掘削工事から生じる泥状の掘削物及び泥水のうち、「廃棄物処理及び清掃に関する法律」（以下、廃棄物処理法という）に規定する産業廃棄物として取り扱われるものをいう。泥状の状態は標準仕様ダンプトラックに山積みできず、その上を人が歩けないような流動性を呈する状態をいう。この泥状の状態を土の強度を示す指標でいえば、コーン指数がおおむね２００ＫＮ／ｍ２以下、又は一軸圧縮強さが概ね５０ＫＮ／ｍ２以下である。なお、掘削物を標準仕様ダンプトラックに山積みできるものであっても、運搬中に流動性を呈するものは建設汚泥に該当する。 Construction sludge is an industry stipulated in the “Waste Disposal and Cleaning Act” (hereinafter referred to as the Waste Disposal Act), among mud excavations and mud generated from various excavations and construction works. What is handled as waste. The muddy state refers to a state in which a standard dump truck cannot be piled up and exhibits fluidity that prevents people from walking on it. Speaking of this mud state as an index indicating the strength of the soil, the cone index is approximately 200 KN / m 2 or less, or the uniaxial compressive strength is approximately 50 KN / m 2 or less. Even if the excavated material can be piled up on a standard dump truck, the one that exhibits fluidity during transportation corresponds to construction sludge.

建設汚泥を廃棄処理をする場合には廃棄物処理法に従って処分をすることが義務づけられており、その処分には多大な廃棄処理費用が必要となるばかりでなく、近年これらの産業廃棄物を処分する最終処分場の受入能力が限界に近づいている。そのため、建設汚泥の減容化とともに、建設汚泥から再利用可能な有効資源を回収し、再生することが強く求められている。また、最終的には建設汚泥を環境に負荷を与えないように処理することが求められている。   It is obliged to dispose of construction sludge in accordance with the Waste Disposal Law, which requires not only a large amount of waste disposal costs, but also disposes of these industrial wastes in recent years. The capacity of the final disposal site is approaching its limit. Therefore, there is a strong demand to recover and recycle effective resources that can be reused from construction sludge as well as to reduce the volume of construction sludge. Moreover, it is finally required to treat the construction sludge so as not to give a load to the environment.

従来、これらの建設汚泥を処理する手段としては、図２に示すように、先ず建設汚泥３１を所定量の水３２とともにドラムウォッシャー等の解泥装置３３に供給して解泥し、解泥水３４を得る。この解泥水３４には礫も含まれているため、トロンメル等の礫除去装置３５を使用して粒径５ｍｍ程度以上の礫を除去し、礫を含まない解泥水３６を得る。この礫を含まない解泥水３６を沈殿槽３７に供給して砂分３８を沈殿させる。そして、沈殿させた砂分３８を沈殿掻揚装置３９を使用して沈殿槽３７の底部から掻き揚げて振動スクリーン４０に供給して、再生砂４１と水分４２とに固液を分離し、再生資源としての再生砂４１を得ている。この再生砂４１をソイルセメントを製造するための原料砂や埋戻用砂として再利用している。   Conventionally, as a means for treating such construction sludge, as shown in FIG. 2, first, construction sludge 31 is supplied together with a predetermined amount of water 32 to a sludge decomposing device 33 such as a drum washer, and the sludge water 34 is removed. Get. Since the defatted water 34 contains gravel, the gravel having a particle diameter of about 5 mm or more is removed by using a gravel remover 35 such as Trommel to obtain the defatted water 36 free of gravel. The defatted water 36 that does not contain gravel is supplied to a settling tank 37 to precipitate sand 38. Then, the sedimented sand 38 is swept up from the bottom of the sedimentation tank 37 using a sedimentation device 39 and supplied to the vibrating screen 40 to separate the solid-liquid into regenerated sand 41 and moisture 42 for regeneration. Reclaimed sand 41 is obtained as a resource. This recycled sand 41 is reused as raw material sand or backfill sand for producing soil cement.

一方、砂分３８を掻き揚げて除去した後の沈殿槽３７に残った泥水４３は、廃水槽４４に供給して貯留し、廃水槽４４から凝集反応槽４５に供給し、凝集剤４６を添加して土粒子を凝集させるようにして、第２沈殿槽４７に供給して土粒子を凝集沈殿させる。そして、凝集してフロックを形成した土粒子を沈殿フロック槽４８に貯留し、フィルタープレス４９によって、脱水ケーキ５０と水分５１とに固液分離している。   On the other hand, the muddy water 43 remaining in the sedimentation tank 37 after scraping and removing the sand 38 is supplied to and stored in the wastewater tank 44, supplied from the wastewater tank 44 to the agglomeration reaction tank 45, and the flocculant 46 is added. Then, the soil particles are aggregated and supplied to the second sedimentation tank 47 to aggregate and settle the soil particles. Then, the soil particles that have aggregated to form flocs are stored in a sedimentation floc tank 48, and are solid-liquid separated into a dehydrated cake 50 and moisture 51 by a filter press 49.

脱水ケーキ５０は固化剤を加えて土質改良機等で撹拌し、改良土としてリサイクルして、有効利用している。一方、第２沈殿槽４７の上澄水５２は解泥装置３３に供給する水３２として再利用している。また、最終的に得られた水分５１や水分４２は再び廃水槽４４に供給することにより、循環処理をしている。   The dehydrated cake 50 is effectively used by adding a solidifying agent, stirring it with a soil conditioner or the like, recycling it as improved soil. On the other hand, the supernatant water 52 of the second settling tank 47 is reused as the water 32 supplied to the thaw device 33. In addition, the finally obtained moisture 51 and moisture 42 are supplied to the wastewater tank 44 again to be circulated.

特許文献１によれば、上記した手段で建設汚泥から砂利及び砂類を選別・除去し、その際に用いた洗浄水と微粒子汚泥の混合液を沈澱させて生じるスラリーを噴霧乾燥させて団粒状物とし、これを焼成してセラミック化する建設汚泥の処理方法が提供されている。   According to Patent Document 1, gravel and sand are selected and removed from construction sludge by the above-described means, and a slurry produced by precipitating a mixed liquid of washing water and fine particle sludge used at that time is spray-dried to form aggregated particles. There is provided a method for treating construction sludge, which is made into a product and ceramicized by firing.

また、特許文献２によれば、建設汚泥にセメント系安定材を混入して加圧した後、５〜１００ｍｍ程度の大きさに造粒し、それを盛土、人工地盤、管渠の埋戻し材、サンドドレーン工法のドレーン材またはマット材などに有効利用する方法が開示されている。   According to Patent Document 2, cement stabilizer is mixed into construction sludge and pressed, and then granulated to a size of about 5 to 100 mm, which is filled with embankment, artificial ground, pipe refilling material. In addition, a method of effectively using the drain material or mat material of the sand drain method is disclosed.

特開平１０−１５６３９２号JP-A-10-156392 特開平０４−４９３１５号JP 04-49315 A

建設汚泥は水分を含んでおり、又建設汚泥から有効資源としての砂を再生するためにドラムウオッシャー等を使用して、水を添加して建設汚泥を解泥しているため、図２や特許文献１に示す従来の建設汚泥の処理手段によって分級された砂は、その処理過程においてシルトや粘土分の細粒分をそのまま含んでいる。この細粒分は粒径７４μｍ以下のシルト分や粒径５μｍ以下の粘土分であるため、砂を分級した後に水で洗浄しただけでは、細粒分を充分に除去することができない。   Construction sludge contains moisture, and because it uses a drum washer to regenerate sand as an effective resource from construction sludge, water is added to thaw the construction sludge. The sand classified by the conventional means for treating construction sludge shown in Document 1 contains fine particles of silt and clay as it is during the treatment process. Since the fine particles are a silt having a particle size of 74 μm or less and a clay having a particle size of 5 μm or less, the fine particles cannot be removed sufficiently only by classifying the sand and washing with water.

そのため、建設汚泥から再生した砂は、砂の一般的用途である埋め戻し砂としては細粒分が多すぎて適しておらず、使用できないものも多い。また、細粒分を含んでいることから、ソイルセメントの材料として使用しようとすると、今度はソイルセメントの原料砂としては細粒分の量が少なすぎて適しておらず、使用できないものも多い。よって、上記した従来の手段で建設汚泥から再生した砂は、埋め戻し砂としては細粒分が多すぎ、一方ソイルセメントの原料砂としては、細粒分が少なすぎるという中途半端な性質の砂であり、その有効利用を図ることが困難である。そのため、その経済的評価も低い。   For this reason, sand regenerated from construction sludge is not suitable as backfill sand, which is a general use of sand, because it contains too many fine particles and cannot be used in many cases. In addition, because it contains fine particles, if you try to use it as a material for soil cement, this time, the amount of fine particles is too small to be suitable for use as a raw material for soil cement. . Therefore, the sand regenerated from construction sludge by the above-mentioned conventional means has too much fine particles as backfill sand, while sand with half-way properties such that there are too few fine particles as soil cement raw material sand. Therefore, it is difficult to make effective use thereof. Therefore, its economic evaluation is low.

一方、特許文献１に示す手段は、砂を除去した後の泥水の用途に関する提案であり、分級した砂は前記した欠点をそのまま有する砂に他ならない。また、特許文献２に示す手段は、産業廃棄物である建設汚泥を廃棄せずにそのまま有効利用できるものであるが、造粒の工程において、セメント類の混入の他、加圧、脱水処理、その解砕、分級、さらに改良土の表面処理や破砕粉の処理が必要であり、そのための処理設備と費用を必要とするものであって、建設汚泥からの有効利用可能な性質の砂の再生に関するものではない。   On the other hand, the means shown in Patent Document 1 is a proposal relating to the use of muddy water after removing sand, and classified sand is nothing but sand having the above-mentioned drawbacks as it is. Moreover, although the means shown in Patent Document 2 can be effectively used as it is without discarding construction sludge as industrial waste, in the granulation process, in addition to mixing cement, pressurization, dehydration treatment, It requires pulverization, classification, surface treatment of improved soil and treatment of crushed powder, and it requires processing equipment and costs for that purpose. It is not about.

そこで、本発明は建設汚泥の減容化とともに、建設汚泥から有効利用可能な性質の砂、具体的には建設汚泥から細粒分を多く含むソイルセメント製造に適した砂と細粒分を清水で洗浄した良質な埋め戻し砂を再生するための建設汚泥の処理方法及び建設汚泥からの再生砂を提供することを目的としている。   Accordingly, the present invention reduces the volume of construction sludge, and sand having properties that can be effectively used from construction sludge, specifically, sand and fine particles suitable for manufacturing soil cement containing a large amount of fine particles from construction sludge. The purpose of this invention is to provide a method for treating construction sludge for reclaiming high-quality backfill sand that has been washed in the field, and reclaimed sand from construction sludge.

本発明はその目的を達成するために、建設汚泥を解泥した解泥水から所定サイズの礫を除去した後、礫を除去した解泥水を液体サイクロンによって粒径７４μｍを分級点として分級することによって、砂分がシルトや粘土からなる細粒分を抱持して濃縮された濃縮解泥水と、砂分が除去された分級解泥水とし、該濃縮解泥水を固液分離することによって、砂分がシルトや粘土からなる細粒分をフロック状に抱持し、細粒分を多く含んで、ソイルセメントの原料砂として適した細粒再生砂と水分を得て、得られた細粒再生砂を洗浄水で洗浄することにより、砂分がフロック状に保持した細粒分を除去し、その後に固液分離することによって、細粒分を除去した埋戻用砂に適した洗浄再生砂と水分を得るとともに、砂分が除去された分級解泥水に凝集剤を添加して凝集沈殿させることにより、上澄水と沈殿フロックを得て、該上澄水を使用して建設汚泥を解泥する建設汚泥の処理方法を基本として提供する。 For the present invention to achieve the purpose, after removal of the predetermined size of the gravel construction sludge from the solution muds Kaidoro, to classifying solutions muds to remove gravel as classification point the particle size 74μ m by hydrocyclone Thus, the concentrated defatted water in which the sand content is held by holding fine particles composed of silt or clay and the classified defluted water from which the sand content has been removed are separated into solid and liquid, and the sand is separated into solid and liquid. min to embrace fine fraction consisting of silt and clay flocculated, Nde many contains the fine fraction, fine reproduction to obtain fine granules reclaimed sand and water which is suitable as a raw material sand soil cement, resulting Washed and reclaimed sand suitable for backfill sand from which fine particles have been removed by washing the sand with washing water to remove fine particles that have been retained in the form of flocs, followed by solid-liquid separation. In addition to obtaining moisture and classified sludge from which sand has been removed By the addition to aggregate precipitate Atsumarizai to give a supernatant water and precipitated floc, provides a processing method of construction sludge Kaidoro construction sludge using upper supernatant water basis.

また、砂分が除去された分級解泥水を廃水槽に貯留し、該廃水槽から凝集反応槽に供給して、該凝集反応槽に凝集剤を添加した後に、沈殿槽に供給し、上澄水と沈殿フロックを得る建設汚泥の処理方法を提供する。 In addition, the classified lysed water from which sand has been removed is stored in a wastewater tank, supplied from the wastewater tank to the agglomeration reaction tank, added with a flocculant to the agglomeration reaction tank, and then supplied to the sedimentation tank, And provide a method of treating construction sludge to obtain sediment floc .

更に、得られた水分を廃水槽に供給する建設汚泥の処理方法を提供する。 Furthermore, the resulting moisture to provide a processing method of construction sludge supplied to the waste water tank.

そして、上記した建設汚泥の処理方法で得られた細粒分を多く含む細粒再生砂であって、ソイルセメント製造用砂として使用される再生砂と、上記した建設汚泥の処理方法で得られた細粒分を除去した洗浄再生砂であって、埋戻用砂として使用される建設汚泥からの再生砂を提供する。 And it is fine-grained reclaimed sand that contains a large amount of fine particles obtained by the above-described construction sludge treatment method, and is obtained by the reclaimed sand used as soil cement manufacturing sand and the above-mentioned construction sludge treatment method. Washed and reclaimed sand from which fine particles have been removed, and reclaimed sand from construction sludge used as backfill sand is provided.

上記構成の本発明によれば、建設汚泥を解泥し、礫を除去した解泥水を液体サイクロンを使用して分級することにより、砂分がシルトや粘土からなる細粒分を抱持して濃縮された濃縮解泥水を得ることができ、この濃縮解泥水を固液分離することによって、ソイルセメントの原料砂として適した細粒分を多く含む細粒再生砂を得ることができる。また、上記した細粒分を多く含む細粒再生砂は細粒分を砂がフロック状に抱持しているため、これを洗浄水で洗浄することによって砂による細粒分の抱持を解放することができるため、細粒分を容易に除去することができる。よって、細粒分を多く含む砂を洗浄水で洗浄することによって細粒分を除去した埋戻用砂に適した洗浄再生砂を得ることができる。これによって、建設汚泥を大幅に減容化できるとともに、有効利用を図ることができる。   According to the present invention having the above-described configuration, the sludge from construction sludge and the defatted water from which the gravel has been removed are classified using a liquid cyclone, so that the sand content is held by fine particles composed of silt or clay. Concentrated concentrated peptized water can be obtained, and fine concentrated reclaimed sand containing a large amount of fine particles suitable as a soil cement raw material sand can be obtained by solid-liquid separation of the concentrated peptized water. In addition, the above-mentioned fine-grained reclaimed sand that contains a large amount of fine particles contains the fine particles in the form of flocs. By washing this with washing water, the holding of fine particles by sand is released. Therefore, the fine particles can be easily removed. Therefore, the washing | cleaning reproduction | regeneration sand suitable for the sand for backfill which removed the fine grain part by wash | cleaning the sand which contains many fine grain parts with a washing | cleaning water can be obtained. As a result, the volume of construction sludge can be greatly reduced and effective use can be achieved.

本発明にかかる建設汚泥の処理方法を概略的に示すシステム図。The system diagram which shows roughly the processing method of the construction sludge concerning this invention. 従来の建設汚泥の処理方法を概略的に示すシステム図。The system diagram which shows schematically the processing method of the conventional construction sludge.

以下図面に基づいて本発明にかかる建設汚泥の処理方法及び建設汚泥からの再生砂の実施形態を説明する。本発明は各種の建設工事や土木工事、例えば場所打ち杭，地中連続壁，シールド工法，推進工法等の各種掘削工事において大量に発生する建設汚泥全般を対象としており、その種類や発生原因には限定はない。本発明は、これらの建設汚泥から細粒分を多く含むソイルセメント製造に適した砂と細粒分を清水で洗浄した良質な埋め戻し砂を再生することにより、建設汚泥の減容化と有効利用を図って、産業廃棄物として環境に負荷を与えないようにリサイクルするためのものである。   Embodiments of a method for treating construction sludge and reclaimed sand from construction sludge according to the present invention will be described below with reference to the drawings. The present invention is intended for general construction sludge generated in large quantities in various excavation works such as cast-in-place piles, underground continuous walls, shield methods, propulsion methods, etc. There is no limitation. The present invention reduces the volume and efficiency of construction sludge by regenerating high-quality backfill sand that has been washed with clean water and sand suitable for the production of soil cement containing a large amount of fine particles from these construction sludge. It is intended for use and recycling as industrial waste so as not to burden the environment.

図１は、本発明にかかる建設汚泥の処理方法を概略的に示すシステム図である。先ず、建設汚泥１をバックホウやベルトフィーダを使用してドラムウォッシャー等の解泥装置３に供給するとともに、所定量の水２を解泥装置３に供給し、建設汚泥１と水を混合してステップＡに示す解泥工程を行って、解泥水４を得る。この解泥水４には礫も含まれているため、トロンメル等の礫除去装置５を使用して、ステップＢに示す粒径５ｍｍ程度以上の礫を除去する礫除去工程を行い、礫を含まない解泥水６を得る。   FIG. 1 is a system diagram schematically showing a construction sludge treatment method according to the present invention. First, the construction sludge 1 is supplied to the sludge removal device 3 such as a drum washer using a backhoe or a belt feeder, and a predetermined amount of water 2 is supplied to the sludge removal device 3 to mix the construction sludge 1 and water. The mud removal process shown in Step A is performed to obtain the mud removal water 4. Since this defatted water 4 also includes gravel, the gravel removal device 5 such as Trommel is used to remove the gravel with a particle size of about 5 mm or more shown in Step B, and no gravel is contained. Obtain demolition water 6.

この礫を含まない解泥水６を液体サイクロン７に供給して、粒径７４μｍ程度を分級点として分級することによってステップＣに示す濃縮工程を行う。そして、液体サイクロン７からのアンダーフロー水として、粒径７４μｍ程度以上の砂分が濃縮された濃縮解泥水８と、液体サイクロン７からのオーバーフロー水として粒径７４μｍ程度以上の砂分が除去された分級解泥水９を得る。この液体サイクロン７による濃縮工程において、粒径７４μｍ程度以上の砂分は濃縮時に粒径７４μｍ以下のシルト分や粒径５μｍ以下の粘土分からなる細粒分を抱持するようにして濃縮される。このことが液体サイクロン７を使用して濃縮を行う本願発明の特徴である。   The concentration process shown in Step C is carried out by supplying the defatted water 6 containing no gravel to the hydrocyclone 7 and classifying it with a particle size of about 74 μm. Then, as the underflow water from the hydrocyclone 7, the concentrated demolition water 8 in which the sand content of about 74 μm or more was concentrated and the sand content of about 74 μm or more as the overflow water from the liquid cyclone 7 was removed. Obtain classified 9 mud water. In the concentration step using the liquid cyclone 7, sand having a particle size of about 74 μm or more is concentrated so as to hold fine particles composed of silt having a particle size of 74 μm or less and clay having a particle size of 5 μm or less. This is a feature of the present invention in which concentration is performed using the liquid cyclone 7.

次に、この濃縮解泥水８を振動スクリーン１０を使用してステップＤに示す固液分離工程を行うことにより、シルトや粘土からなる細粒分を抱持させて細粒分を多く含む細粒再生砂１１と水分１２を得る。この細粒再生砂１１はシルトや粘土からなる細粒分を多く含んでいるため、ソイルセメントの原料砂に適している。これはソイルセメントの管理基準にブリージング率があり、シルトや粘土からなる細粒分を持たない砂の場合はブリージング率が大きくなり、管理基準を超えるため、使用することができず、一方適度に細粒分を含んだ砂は強度も出やすく、セメント量も少なくて済むため、最適と指されている。よって、この細粒再生砂１１をソイルセメント再生砂として再利用或いは販売をする。   Next, by carrying out the solid-liquid separation process shown in Step D using the vibrating screen 10 for the concentrated demolition water 8, fine particles containing a large amount of fine particles are held by holding fine particles made of silt or clay. Regenerated sand 11 and moisture 12 are obtained. Since this fine-grained reclaimed sand 11 contains a large amount of fine grains made of silt or clay, it is suitable as a soil cement raw material sand. This is because the management standard of soil cement has a breathing rate, and sand that does not have fine particles of silt or clay has a higher breathing rate and exceeds the management standard, so it cannot be used. Sand containing fine particles is said to be optimal because it is easy to increase strength and requires less cement. Therefore, the fine grain recycled sand 11 is reused or sold as soil cement recycled sand.

一方、液体サイクロン７からのオーバーフロー水である粒径７４μｍ程度以上の砂分が除去された分級解泥水９は、廃水槽１３に供給されて一旦貯留されてから、凝集反応槽１４に供給され、所定の凝集剤１５を添加して、微細な土粒子を凝集させてフロックを形成するように沈殿槽１６に供給されて、フロックを沈殿させる。そして、沈殿槽１６で沈殿させたフロックを沈殿フロック槽１７に供給し、フィルタープレス１８を使用してステップＥに示す脱水工程を行い、脱水ケーキ１９と水分２０を得る。この脱水ケーキ１９は従来と同様に固化剤を加えて土質改良機等で撹拌し、改良土としてリサイクルして、有効利用する。そして、水分２０は廃水槽１３に循環させて処理をする。なお、分級解泥水９はシルトや粘土からなる細粒分が砂分に抱持されて減少しているため、フィルタープレス１８への負担が少ない。   On the other hand, classified sludge water 9 from which sand having a particle size of about 74 μm or more, which is overflow water from the hydrocyclone 7, is removed, is supplied to the wastewater tank 13 and temporarily stored, and then supplied to the agglomeration reaction tank 14. A predetermined flocculant 15 is added, and the fine soil particles are aggregated to be supplied to the settling tank 16 so as to form flocs, thereby precipitating the flocs. Then, the floc precipitated in the settling tank 16 is supplied to the settling floc tank 17 and the dehydration process shown in Step E is performed using the filter press 18 to obtain the dehydrated cake 19 and moisture 20. The dewatered cake 19 is added with a solidifying agent and stirred with a soil conditioner or the like, and recycled as improved soil for effective use. The water 20 is circulated through the waste water tank 13 for processing. In addition, since the finely divided part made of silt or clay is held in the sand part and reduced in the classified sludge water 9, the burden on the filter press 18 is small.

一方、沈殿槽１６で得られる上澄水２１は解泥装置３に供給する解泥用の水２として利用する。更に、この上澄水２１を洗浄水２２として洗浄槽２３に供給するとともに、洗浄槽２３に前記した濃縮解泥水８から固液分離した細粒再生砂１１を供給し、ステップＦに示す洗浄工程として洗浄水２２で細粒再生砂１１を洗浄し、細粒再生砂１１からシルトや粘土からなる細粒分を除去する。そして、洗浄後に洗浄槽２３からハイメッシュセパレータ等の沈殿掻揚装置２４を使用してステップＧに示す掻揚工程を行い、砂分を掻き揚げる。その後、掻き揚げた砂分を振動スクリーン２５を使用してステップＨに示す固液分離工程を行い、洗浄再生砂２６と水分２７を得る。なお、水分２７は廃水槽１３に循環させて処理をする。また、固液分離工程Ｄにおいて振動スクリーン１０によって分離された水分１２も同様に廃水槽１３に循環させて処理をする。更に、洗浄槽２３における洗浄後の水分も同様に廃水槽１３に循環させて処理することもできる。   On the other hand, the supernatant water 21 obtained in the settling tank 16 is used as the water 2 for the thawing supplied to the thawing device 3. Further, the supernatant water 21 is supplied as washing water 22 to the washing tank 23, and the finely regenerated sand 11 solid-liquid separated from the concentrated demulsified water 8 is supplied to the washing tank 23 as a washing process shown in Step F. The fine-grained reclaimed sand 11 is washed with the washing water 22, and the fine-grained portion made of silt or clay is removed from the fine-grained reclaimed sand 11. Then, after cleaning, the sedimentation device 24 such as a high-mesh separator is used from the cleaning tank 23 to perform a scouring process shown in Step G, and the sand content is raked up. Thereafter, the sand that has been scooped up is subjected to a solid-liquid separation process shown in Step H by using the vibrating screen 25 to obtain washed and regenerated sand 26 and moisture 27. The moisture 27 is circulated in the waste water tank 13 for processing. Further, the water 12 separated by the vibrating screen 10 in the solid-liquid separation step D is similarly circulated to the waste water tank 13 for processing. Furthermore, the water after washing in the washing tank 23 can also be circulated to the waste water tank 13 for treatment.

このようにして得られた洗浄再生砂２６は、細粒再生砂１１からシルトや粘土からなる細粒分が洗浄されて除去されているため、良質な埋戻用砂となっている。埋戻用砂としては細粒分が含まれないほど品質評価は高くなり、高価格で販売することが可能である。よって、この洗浄再生砂２６を埋戻用砂として再利用或いは販売をする。   The washed reclaimed sand 26 thus obtained is a high-quality backfill sand because the fine-grained reclaimed sand 11 has been washed away with fine particles made of silt or clay. As the backfilling sand does not contain fine particles, the quality evaluation becomes higher and it can be sold at a higher price. Therefore, the washed recycled sand 26 is reused or sold as backfill sand.

本発明にかかる建設汚泥の処理方法及び建設汚泥からの再生砂によれば、建設汚泥を解泥し、礫を除去した解泥水を液体サイクロンを使用して分級することにより、砂分がシルトや粘土からなる細粒分を抱持して濃縮された濃縮解泥水を得ることができ、この濃縮解泥水を固液分離することによって、ソイルセメントの原料砂として適した細粒分を多く含む細粒再生砂を得ることができる。また、上記した細粒分を多く含む細粒再生砂は細粒分を砂がフロック状に抱持しているため、これを洗浄水で洗浄することによって砂による細粒分の抱持を解放することができるため、細粒分を容易に除去することができる。よって、細粒分を多く含む砂を洗浄水で洗浄することによって細粒分を除去した埋戻用砂に適した洗浄再生砂を得ることができる。これによって、建設汚泥を大幅に減容化できるとともに、有効利用を図ることができる。   According to the method for treating construction sludge and the reclaimed sand from the construction sludge according to the present invention, the sand is separated by silt by separating the sludge from the construction sludge and classifying the dewatered sludge from which the gravel has been removed using a liquid cyclone. Concentrated demolition water can be obtained by embracing fine particles made of clay, and by separating the concentrated demolition water into solid and liquid, it is possible to obtain fine particles containing many fine particles suitable as soil cement raw material sand. Granulated sand can be obtained. In addition, the above-mentioned fine-grained reclaimed sand that contains a large amount of fine particles contains the fine particles in the form of flocs. By washing this with washing water, the holding of fine particles by sand is released. Therefore, the fine particles can be easily removed. Therefore, the washing | cleaning reproduction | regeneration sand suitable for the sand for backfill which removed the fine grain part by wash | cleaning the sand which contains many fine grain parts with a washing | cleaning water can be obtained. As a result, the volume of construction sludge can be greatly reduced and effective use can be achieved.

１…建設汚泥
２…水
３…解泥装置
４…解泥水
５…礫除去装置
６…礫を含まない解泥水
７…液体サイクロン
８…濃縮解泥水
９…分級解泥水
１０，２５…振動スクリーン
１１…細粒再生砂
１２，２０，２７…水分
１３…廃水槽
１４…凝集反応槽
１５…凝集剤
１６…沈殿槽
１７…沈殿フロック槽
１８…フィルタープレス
１９…脱水ケーキ
２１…上澄水
２２…洗浄水
２３…洗浄槽
２４…沈殿掻揚装置
２６…洗浄再生砂 DESCRIPTION OF SYMBOLS 1 ... Construction sludge 2 ... Water 3 ... Sludge removal device 4 ... Sludge removal water 5 ... Gravel removal device 6 ... Debris free debris 7 ... Liquid cyclone 8 ... Concentrated desulfurization water 9 ... Classified sludge removal water 10, 25 ... Vibration screen 11 Recycled sand 12, 20, 27 ... Water 13 ... Waste water tank 14 ... Coagulation reaction tank 15 ... Coagulant 16 ... Precipitation tank 17 ... Precipitation floc tank 18 ... Filter press 19 ... Dehydrated cake 21 ... Supernatant water 22 ... Washing water 23 ... Washing tank 24 ... Precipitation rake device 26 ... Washing regenerated sand

Claims (5)

建設汚泥を解泥した解泥水から所定サイズの礫を除去した後、礫を除去した解泥水を液体サイクロンによって粒径７４μｍを分級点として分級することによって、砂分がシルトや粘土からなる細粒分を抱持して濃縮された濃縮解泥水と、砂分が除去された分級解泥水とし、該濃縮解泥水を固液分離することによって、砂分がシルトや粘土からなる細粒分をフロック状に抱持し、細粒分を多く含んで、ソイルセメントの原料砂として適した細粒再生砂と水分を得て、
得られた細粒再生砂を洗浄水で洗浄することにより、砂分がフロック状に保持した細粒分を除去し、その後に固液分離することによって、細粒分を除去した埋戻用砂に適した洗浄再生砂と水分を得るとともに、
砂分が除去された分級解泥水に凝集剤を添加して凝集沈殿させることにより、上澄水と沈殿フロックを得て、該上澄水を使用して建設汚泥を解泥することを特徴とする建設汚泥の処理方法。 After removal of the predetermined size of the gravel construction sludge from the solution muds Kaidoro, by classifying the solutions muds to remove the gravel particle size 74μ m as classification point by the liquid cyclone, fine sand fraction is composed of silt and clay and concentrated solutions mud enriched by embracing the particle fraction, and classification solutions mud sand amount has been removed by solid-liquid separation of the concentrated solution muds, the fine fraction sand fraction is composed of silt and clay and embracing the flock, Nde many contains the fine fraction to obtain a fine reclaimed sand and water which is suitable as a raw material sand soil cement,
By washing the obtained fine-grained reclaimed sand with washing water, the fine-grained sand is removed by removing the fine-grained part retained in a flock form, and then solid-liquid separated to remove the fine-grained part. Washing and regenerating sand and moisture suitable for
A construction characterized by adding a flocculant to the classified lysed water from which sand has been removed and aggregating and precipitating to obtain supernatant water and sedimented flocs, and using the supernatant water to lyse construction sludge. Sludge treatment method. 砂分が除去された分級解泥水を廃水槽に貯留し、該廃水槽から凝集反応槽に供給して、該凝集反応槽に凝集剤を添加した後に、沈殿槽に供給し、上澄水と沈殿フロックを得る請求項１に記載の建設汚泥の処理方法。 The classified sludge from which sand has been removed is stored in a wastewater tank, supplied from the wastewater tank to the agglomeration reaction tank, and after adding a flocculant to the agglomeration reaction tank, supplied to the precipitation tank, and the supernatant water and the sediment The method for treating construction sludge according to claim 1, wherein floc is obtained. 得られた水分を廃水槽に供給する請求項２記載の建設汚泥の処理方法。 The resulting water processing method construction sludge according to claim 2, wherein supplying the waste water tank. 請求項１〜３のいずれかに記載の建設汚泥の処理方法で得られた細粒分を多く含む細粒再生砂であって、ソイルセメント製造用砂として使用されることを特徴とする建設汚泥からの再生砂。 Construction sludge, which is fine-grained reclaimed sand containing a large amount of fine particles obtained by the method for treating construction sludge according to any one of claims 1 to 3, and is used as sand for producing soil cement. Recycled sand from. 請求項１〜３のいずれかに記載の建設汚泥の処理方法で得られた細粒分を除去した洗浄再生砂であって、埋戻用砂として使用されることを特徴とする建設汚泥からの再生砂。 Washed recycled sand from which fine particles obtained by the method for treating construction sludge according to any one of claims 1 to 3 have been removed, and used as backfill sand. Recycled sand.
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