JP6202564B2 - Cement sludge water treatment method - Google Patents
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本発明は、例えば、高い含水比率であり、かつコンクリート汚泥などの固形物を含む汚泥水を急速に脱水し、かつ前記汚泥中に存する固形物を固化させ、水と固形物に分離するいわゆる高含水比濃縮汚泥の処理などを対象とした重金属被覆固化剤を使用したセメント汚泥水の処理方法に係り、特にフッ素や六価クロムなどの重金属を固形物内に閉じ込め、分離した水の中には前記重金属を滞留させないセメント汚泥水の処理方法に関するものである。 The present invention is, for example, a so-called high water content which has a high moisture content and rapidly dewaters sludge water containing solids such as concrete sludge and solidifies the solids present in the sludge to separate it into water and solids. It is related to the treatment method of cement sludge water using heavy metal coating solidifying agent intended for the treatment of moisture content concentrated sludge, etc. Especially, heavy metals such as fluorine and hexavalent chromium are confined in solid matter, and in the separated water The present invention relates to a method for treating cement sludge water that does not retain heavy metals.
すなわち、前記高含水比をなす濃縮汚泥を急速に吸湿脱水分離し、当該濃縮汚泥中に含有する固形物などに重金属を封じ込めて安定した固体として水と分離するのである。
That is, the concentrated sludge having a high water content is rapidly absorbed and dehydrated and then separated from water as a stable solid by containing heavy metal in a solid material or the like contained in the concentrated sludge.
従来、濃縮汚泥中に存する固形物の固化処理法としては、一般にセメント系または石灰系のものを多量に添加し水和反応によって固定する方法が採用されている。 Conventionally, as a solidification treatment method for solids present in concentrated sludge, a method in which a large amount of cement-based or lime-based materials are generally added and fixed by a hydration reaction has been employed.
概ね処理対象物が無機系成分で構成されている場合には、セメント系のものが選択され、有機系成分で構成されている場合には石灰系のものが選択される。 In general, when the object to be treated is composed of an inorganic component, a cement-based one is selected, and when it is composed of an organic component, a lime-based one is selected.
セメント系または石灰系による水分処理は、単なる水分の吸収による自己硬化反応であるので処理対象物中の含水量によって添加量が決められるが、通常３０乃至４０重量部前後必要とすると言われている。 Cement-based or lime-based moisture treatment is a self-curing reaction based on mere moisture absorption, so the amount to be added is determined by the moisture content in the object to be treated, but is usually said to require around 30 to 40 parts by weight. .
濃縮汚泥の脱水に関する従来のもう一つの処理法としては脱水機を使用する場合があるが、かかる場合は、凝集剤（無機系または有機系）の添加量が多量に必要となるばかりか、脱水が困難になるなどの課題がある。 Another conventional treatment method for dewatering concentrated sludge is to use a dehydrator. In such a case, a large amount of flocculant (inorganic or organic) needs to be added. There are problems such as becoming difficult.
さらに、フッ素や六価クロムなどの重金属が前記汚泥中に混入している場合には、水と固形物に分離するのみならず、水の中に重金属を土壌環境基準値以上に滞留させないことが重要な処理方法となる。 In addition, when heavy metals such as fluorine and hexavalent chromium are mixed in the sludge, not only is it separated into water and solid matter, but heavy metals are not allowed to stay in the water above the soil environmental standard value. It becomes an important processing method.
なぜなら、重金属が混入した水はそのまま下水道に流すことができないなど、安易に処分することができないからである。
This is because the water mixed with heavy metals cannot be disposed of easily, for example, it cannot flow into the sewer as it is.
本発明は、前記従来の課題に対処すべく創案されたものであって、汚泥中の汚泥水と固形物とを速やかに分離させ、固形物内に重金属を閉じ込めて該固形物をスムーズに固化させることができる。 The present invention was devised to cope with the above-mentioned conventional problems, and quickly separates sludge water and solids in sludge and consolidates heavy metals in the solids to solidify the solids smoothly. Can be made.
しかも重金属を内部に封入して安定した形での固形物固化が達成でき、もって分離水の浄化をも高効率に行えるセメント汚泥水の処理方法を提供することを目的とするものである。
Moreover, it is an object of the present invention to provide a method for treating cement sludge water that can achieve solid solidification in a stable form by enclosing heavy metal therein, and that can purify separated water with high efficiency.
本発明によるセメント汚泥水の処理方法は、
ペーパースラッジが２８乃至６８重量部、可溶性無水石膏が１０乃至５０重量部、硫酸バンドが３乃至４３重量部、消石灰が８乃至４８重量部、ソーダ灰が０．４乃至２８重量部、ポルトランドセメントが０．３乃至２６重量部、中性からアルカリ性を示す汚泥水の分離処理に優れるアニオン系高分子ポリマーが０．１乃至１１重量部、チオ硫酸ソーダが０．１５乃至２３重量部、硫酸第１鉄が０．１乃至２２重量部、シリカが０．０５乃至２１重量部を含んで配合構成された重金属被覆固化剤を使用しての工場あるいは建設現場から排出されるセメント汚泥水の処理方法であり、
前記セメント汚泥水内にセメント泥の固形物が３０％ないし２０％含まれているとき、前記セメント汚泥水内に前記構成からなる重金属被覆固化剤を前記セメント泥の固形物の重量の１割程度を投与して攪拌し、セメント汚泥水を水と固形物とに分離し、該固形物は、内部に重金属を閉じこめて、含水率８０％程度の手で持てる程度に固まり、前記分離した水には、前記重金属が含まれない、
ことを特徴とし、
または、
ペーパースラッジが１７８乃至２１８重量部、可溶性無水石膏が１０乃至５０重量部、硫酸バンドが３乃至４３重量部、消石灰が８乃至４８重量部、ソーダ灰が０．４乃至２８重量部、ポルトランドセメントが０．３乃至２６重量部、中性からアルカリ性を示す汚泥水の分離処理に優れるアニオン系高分子ポリマーが０．１乃至１１重量部、チオ硫酸ソーダが０．１５乃至２３重量部、硫酸第１鉄が０．１乃至２２重量部、シリカが０．０５乃至２１重量部を含んで配合構成された重金属被覆固化剤を使用しての工場あるいは生コン車から排出されるセメントを含んだ濁水の処理方法であり、
前記セメントを含んだ濁水内にセメントの固形物が５％ないし７％含まれているとき、前記セメントを含んだ濁水に、該セメントの固形物の１割程度の重量の前記重金属被覆固化剤を投与して攪拌し、セメントを含んだ濁水を水と固形物とに分離し、該固形物は、内部に重金属を閉じこめて、含水率８０％程度の手で持てる程度に固まり、前記分離した水には、前記重金属が含まれない、
ことを特徴とし、
または、
前記のポルトランドセメントは、普通、早強、超早強、中庸熱、耐硫酸塩の各種ポルトランドセメントのいずれかの一種またはいずれかのセメントを選択しての混合である、
ことを特徴とするものである。
The method for treating cement sludge water according to the present invention includes:
28 to 68 parts by weight of paper sludge, 10 to 50 parts by weight of soluble anhydrite, 3 to 43 parts by weight of sulfuric acid band, 8 to 48 parts by weight of slaked lime, 0.4 to 28 parts by weight of soda ash, and Portland cement 0.3 to 26 parts by weight, 0.1 to 11 parts by weight of anionic polymer excellent in separation treatment of neutral to alkaline sludge water, 0.15 to 23 parts by weight of sodium thiosulfate, and sulfuric acid first A method for treating cement sludge discharged from a factory or construction site using a heavy metal coating solidifying agent containing 0.1 to 22 parts by weight of iron and 0.05 to 21 parts by weight of silica. Yes,
When the cement sludge water contains 30% to 20% of cement sludge solids, the heavy metal coating solidifying agent having the above structure is added to the cement sludge water about 10% of the weight of the cement sludge solids. The cement sludge water is separated into water and solid matter, and the solid matter is solidified so that it can be held in a hand with a moisture content of about 80% by confining heavy metal inside. It is, have said such contains heavy metals,
It is characterized by
Or
178 to 218 parts by weight of paper sludge, 10 to 50 parts by weight of soluble anhydrite, 3 to 43 parts by weight of sulfuric acid band, 8 to 48 parts by weight of slaked lime, 0.4 to 28 parts by weight of soda ash, and Portland cement 0.3 to 26 parts by weight, 0.1 to 11 parts by weight of anionic polymer excellent in separation treatment of neutral to alkaline sludge water, 0.15 to 23 parts by weight of sodium thiosulfate, and sulfuric acid first Treatment of muddy water containing cement discharged from a factory or ready-mixed vehicle using a heavy metal coating solidifying agent containing 0.1 to 22 parts by weight of iron and 0.05 to 21 parts by weight of silica Is the way
When 5% to 7% of cement solids are contained in the turbid water containing cement, the heavy metal-coated solidifying agent having a weight of about 10% of the cement solids is added to the turbid water containing cement. The turbid water containing cement is separated into water and solid matter, and the solid matter is solidified so that it can be held by hand with a moisture content of about 80%. Does not include the heavy metal,
It is characterized by
Or
The Portland cement is usually, early strength, super early strength, moderate heat, mixed with any one kind of various Portland cements of sulfate resistance, or any cement selected.
It is characterized by this.
本発明にかかるセメント汚泥水の処理方法によれば、汚泥中の汚泥水と固形物とを速やかに分離させ、固形物内に重金属を閉じ込めて該固形物をスムーズに固化させることができる。しかも重金属を内部に封入して安定した形での固形物固化が達成でき、もって分離水の浄化をも高効率に行えるとの優れた効果を奏する。
According to the method for treating cement sludge water according to the present invention, it is possible to quickly separate sludge water and solid matter in the sludge, confine heavy metals in the solid matter, and smoothly solidify the solid matter. In addition, solid metal can be solidified in a stable form by enclosing heavy metal therein, and the separation water can be purified with high efficiency.
本実施例による固化剤の生成に際しては、まず、ペーパースラッジが２８乃至６８重量部、配合される。 In producing the solidifying agent according to this example, first, 28 to 68 parts by weight of paper sludge is blended.
このペーパースラッジ(paper sludge)は、例えば、製紙工程で排出される廃棄物であり、セルロースを含む繊維物が主成分であり、最近ではこれを焼却してできる炭化物(PSC)が更なる有効資源として注目されている。 This paper sludge is, for example, waste discharged in the papermaking process, and is mainly composed of fiber containing cellulose. Recently, carbon (PSC) produced by incineration of this is a more effective resource. It is attracting attention as.
そして、炭化させたペーパースラッジ灰(PSC)は、表面が多孔質になっていて、そのため、消臭剤・化学物質吸着材など多岐にわたる用途が期待されており、本発明ではこのペーパースラッジを２８乃至６８重量部、配合するものとする。 Carbonized paper sludge ash (PSC) has a porous surface, and therefore, it is expected to be used in a wide variety of applications such as deodorants and chemical adsorbents. From 68 parts by weight shall be blended.
次に、無水石膏が１０乃至５０重量部、配合される。無水石膏とは、結晶水を持たない硫酸カルシウムで、可溶性無水石膏（III型無水石膏）と不溶性無水石膏（II型無水石膏）がある。半水石膏を加熱（180℃〜190℃）して得られる可溶性無水石膏は、空気中の水分を吸着して半水石膏に戻る。一方、不溶性無水石膏は天然に存在するが、二水石膏を300℃〜700℃で焼成することでも得られる。不溶性無水石膏は水を加えても容易に水和反応しないが、凝結促進剤を加えて硬化させることができる。本発明では、可溶性無水石膏が用いられるものとなる。 Next, 10 to 50 parts by weight of anhydrous gypsum is blended. Anhydrous gypsum is calcium sulfate without crystal water, and includes soluble anhydrite (type III anhydrite) and insoluble anhydrite (type II anhydrite). Soluble anhydrous gypsum obtained by heating hemihydrate gypsum (180 ° C. to 190 ° C.) adsorbs moisture in the air and returns to hemihydrate gypsum. On the other hand, insoluble anhydrous gypsum exists naturally, but it can also be obtained by baking dihydrate gypsum at 300 ° C to 700 ° C. Insoluble anhydrous gypsum does not readily hydrate when water is added, but can be cured by adding a setting accelerator. In the present invention, it is assumed that the soluble anhydrite is used.
また、硫酸バンドが３乃至４３重量部、配合される。当該硫酸バンドは、本発明において汚泥水中の浮遊物を沈降させるために用いられる。 In addition, 3 to 43 parts by weight of a sulfuric acid band is blended. The sulfuric acid band is used in the present invention to settle suspended matter in sludge water.
次に、消石灰が８乃至４８重量部、配合される。消石灰の原料は石灰石であり、該石灰石は粉砕・焼成・加水(消化)等の工程を経る事で、炭酸カルシウム(炭カル)、生石灰、消石灰と名前を変え、使用方法も変わる。生石灰に加水して消化、熟成させたものが消石灰となる。 Next, 8 to 48 parts by weight of slaked lime is blended. The raw material of slaked lime is limestone, and the limestone is renamed calcium carbonate (charcoal), quick lime, and slaked lime through processes such as pulverization, firing, and hydrolysis (digestion), and the usage method is also changed. What is hydrolyzed and digested and aged into quicklime is slaked lime.
CaO(酸化カルシウム)＋H2O(水)→Ca(OH)2(水酸化カルシウム)
形状は白色の微粉体で、粒径は150μm以下が主体となる。かさ比重は0.4〜0.55程度、難溶解性であるが、スラリーにすると強いアルカリ性を示す。
CaO (calcium oxide) + H 2 O (water) → Ca (OH) 2 (calcium hydroxide)
The shape is white fine powder, and the particle size is mainly 150 μm or less. The bulk specific gravity is about 0.4 to 0.55 and hardly soluble, but when it is made into a slurry, it shows strong alkalinity.
飲料水のpHは5.8〜8.6と規定されている為、原水の酸性度が高い場合に消石灰の強いアルカリ性を利用してpH調整(中和)目的に凝集池や沈殿池に注入される場合がある。但し、消石灰は粉体を溶解する手間がかかりハンドリングの悪さから原水のpH調整用途で使用されている現場は少なくなっている。むしろ赤水防止及び配管内壁に被膜を作る目的で配水池に消石灰を注入する事例が増えている。また、家庭から出た排水は下水処理場で処理されるが、反応槽で微生物により分解された汚泥を凝集沈殿させる際に、消石灰は、他の無機凝集剤等と併せて使用される。又、脱臭・殺菌目的で注入する場合もある。 Since the pH of drinking water is regulated between 5.8 and 8.6, when the raw water has high acidity, it may be injected into coagulation ponds or sedimentation basins for the purpose of pH adjustment (neutralization) using the strong alkalinity of slaked lime. is there. However, slaked lime is troublesome to dissolve the powder, and due to poor handling, the number of sites where it is used for pH adjustment of raw water is decreasing. Rather, there are an increasing number of cases where slaked lime is injected into the reservoir for the purpose of preventing red water and creating a coating on the inner wall of the pipe. In addition, wastewater discharged from households is treated in a sewage treatment plant, but slaked lime is used in combination with other inorganic flocculants and the like when coagulating and sedimenting sludge decomposed by microorganisms in a reaction tank. Moreover, it may inject | pour for the purpose of deodorizing and disinfection.
さらに、ゴミ焼却場等の排ガス中のSOxやHCl除去用途で消石灰が使用されており、またバグフィルターで回収した飛灰から砒素等の不純物が溶出するのを防止する目的で灰加湿器に粉末消石灰を供給する用途もある。ごみ固形燃料(RDF)成型用途では、殺菌作用を利用して微生物による発酵を抑える為に消石灰を混合する。 In addition, slaked lime is used to remove SOx and HCl in exhaust gas from garbage incinerators, and powder in ash humidifiers to prevent arsenic and other impurities from eluting from fly ash collected by bag filters. There is also an application to supply slaked lime. In refuse solid fuel (RDF) molding applications, slaked lime is mixed to suppress fermentation by microorganisms using sterilization.
その他、製糖工場で砂糖を精製する際に、高濃度の砂糖水溶液に消石灰を加え二酸化炭素(CO2)を吹き込み、炭酸カルシウム(CaCO3)を生成し、不純物を吸着して沈殿除去するのに使用されている。この様に、活躍の場面は多岐に渡り、本発明の固化剤においても汚泥水の存する固形物を凝集沈殿させるに際し重要な役目を果たしている。 In addition, when refining sugar in a sugar factory, slaked lime is added to a high-concentration sugar aqueous solution and carbon dioxide (CO 2 ) is blown to produce calcium carbonate (CaCO 3 ), which adsorbs impurities and removes precipitates. It is used. Thus, the scene of an activity is wide-ranging and the solidifying agent of the present invention also plays an important role in agglomerating and precipitating solids containing sludge water.
次に、ソーダ灰が０．４乃至２８重量部、配合される。ソーダ灰とは炭酸ナトリウムであり、当該ソーダ灰はガラス原料、石けん、洗剤、無機化学向け原料あるいは食品添加物用途など幅広い分野で利用される。本発明では、主に、水処理助剤として使用される。 Next, 0.4 to 28 parts by weight of soda ash is blended. Soda ash is sodium carbonate, and the soda ash is used in a wide range of fields including glass raw materials, soaps, detergents, raw materials for inorganic chemistry, and food additives. In the present invention, it is mainly used as a water treatment aid.
また、ポルトランドセメントが０．３乃至２６重量部、配合される。 Portland cement is blended in an amount of 0.3 to 26 parts by weight.
一般に「セメント」とは「ポルトランドセメント」を指標し、特に普通ポルトランドセメントを指している。これは、普通ポルトランドセメントの用途範囲が非常に広く、「オールラウンドなセメント」と指標されるからである。 In general, “cement” refers to “Portland cement”, and particularly ordinary Portland cement. This is because ordinary Portland cement has a very wide application range and is indicated as “all-round cement”.
しかしながら、本発明においてポルトランドセメントには、普通、早強、超早強、中庸熱、耐硫酸塩の各種ポルトランドセメントのいずれかの一種またはいずれかのセメントを選択して混合されたものを指標する。 However, in the present invention, the portland cement is usually, early strength, ultra-early strength, moderate heat, sulfate-resistant, or any one of the various portland cements selected or mixed. .
次に、高分子ポリマーが０．１乃至１１重量部、配合される。高分子ポリマーは、少ない使用量であっても優れた凝集効果を発揮する。またＰＨ値により効果の変化があり、中性からアルカリ性を示す汚泥水の分離処理に優れている。ここで高分子ポリマーとしてはアニオン系高分子ポリマーが好ましい。 Next, 0.1 to 11 parts by weight of the high molecular weight polymer is blended. The high molecular polymer exhibits an excellent aggregation effect even with a small amount of use. In addition, the effect varies depending on the PH value, and it is excellent in the separation treatment of sludge water exhibiting neutral to alkaline. Here, as the polymer, an anionic polymer is preferable.
次に、チオ硫酸ソーダが０．１５乃至２３重量部、配合される。チオ硫酸ソーダとは別名チオ硫酸ナトリウムとも称され、水処理助剤として使用される。 Next, 0.15 to 23 parts by weight of sodium thiosulfate is blended. Sodium thiosulfate is also called sodium thiosulfate and is used as a water treatment aid.
次に、硫酸第１鉄が０．１乃至２２重量部、配合される。硫酸第一鉄は、酸化第二鉄・紺青等の顔料・屎尿処理・産業廃水(ヘドロ等)の中和・凝集沈降剤・土壌改良剤などの多用途に対応する。脱硫及び脱臭効果に関し、本品は硫化水素・アンモニアを同時吸着する効果が優れており、屎尿並びに下水処理・鶏糞乾燥時の脱臭、魚腸骨処理工場の脱臭等と悪臭公害防止に最適とおいわれている。本発明において沈殿促進剤として機能するものとなる。 Next, 0.1 to 22 parts by weight of ferrous sulfate is added. Ferrous sulfate can be used for various purposes such as pigments such as ferric oxide and bitumen, treatment of human waste, neutralization of industrial wastewater (such as sludge), coagulating sedimentation agent, and soil conditioner. With regard to desulfurization and deodorization effects, this product is excellent in the effect of simultaneous adsorption of hydrogen sulfide and ammonia, and is said to be optimal for prevention of bad odor pollution such as deodorization during manure and sewage treatment / drying of chicken manure, deodorization in fish iliac treatment plant, etc. ing. In the present invention, it functions as a precipitation accelerator.
次に、シリカが０．０５乃至２１重量部を含んで配合される。クロロシラン類・珪酸ナトリウムなどから生産される二酸化珪素(SiO2)である。本発明において水処理助剤として使用される。 Next, silica is blended containing 0.05 to 21 parts by weight. Silicon dioxide (SiO2) produced from chlorosilanes and sodium silicate. In the present invention, it is used as a water treatment aid.
次に、図１を参照して本実施例の具体例を説明する。 Next, a specific example of this embodiment will be described with reference to FIG.
本実施例では、ペーパースラッジを６０ｇ、無水石膏を２０ｇ、硫酸バンドを１３ｇ、消石灰を５ｇ、ソーダ灰を１０ｇ、ポルトランドセメントを１５ｇ、高分子ポリマーを２ｇ、チオ硫酸ソーダを５ｇ、硫酸第１鉄を５ｇ、シリカを１５ｇ配合し、本発明による固化剤１５０ｇを生成した。 In this example, 60 g of paper sludge, 20 g of anhydrous gypsum, 13 g of sulfuric acid band, 5 g of slaked lime, 10 g of soda ash, 15 g of Portland cement, 2 g of high polymer, 5 g of sodium thiosulfate, ferrous sulfate 5 g and 15 g of silica were blended to produce 150 g of a solidifying agent according to the present invention.
そして、当該固化剤を例えば工場などあるいは建設現場などから排出されるセメント汚泥水について、水と固形物との分離に使用した。例えば、前記セメント汚泥水中にセメント泥などの固形物が３０％乃至２０％程度含まれているとき、本固化剤をその固形物の１割程度、すなわち３％乃至２％の固化剤を投入する。 And the said solidifying agent was used for isolation | separation of water and a solid substance about the cement sludge water discharged | emitted, for example from a factory etc. or a construction site. For example, when about 30% to 20% of solid matter such as cement mud is contained in the cement sludge water, about 10% of the solid matter, that is, 3% to 2% of solidifying agent is added. .
そして、所定時間攪拌すると、水と固形物に分離した。該固形物は含水率８０％程度の固形物であり、充分に手で持てる程度に固まるものとなった。そしてその固形物内には六価クロムなどの重金属を閉じ込めることができた。よって分離した水には前記重金属は土壌環境基準値以上は排出されてはいないものであった。
And when it stirred for the predetermined time, it isolate | separated into water and a solid substance. The solid matter was a solid matter having a water content of about 80%, and became solid enough to be held by hand. And the heavy metal such as hexavalent chromium could be confined in the solid. Therefore, the heavy metal was not discharged above the soil environmental standard value in the separated water.
次に図２を参照して本発明の第２実施例につき説明する。
第２実施例では、本発明による固化剤の生成に際しては、まず、ペーパースラッジを２１０ｇ、無水石膏を２０ｇ、硫酸バンドを１３ｇ、消石灰を５ｇ、ソーダ灰を１０ｇ、ポルトランドセメントを１５ｇ、高分子ポリマーを２ｇ、チオ硫酸ソーダを５ｇ、硫酸第１鉄を５ｇ、シリカを１５ｇ配合し、本発明による固化剤３００ｇを生成した。
Next, a second embodiment of the present invention will be described with reference to FIG.
In the second embodiment, when producing the solidifying agent according to the present invention, first, 210 g of paper sludge, 20 g of anhydrous gypsum, 13 g of sulfuric acid band, 5 g of slaked lime, 10 g of soda ash, 15 g of Portland cement, polymer polymer 2 g, 5 g of sodium thiosulfate, 5 g of ferrous sulfate and 15 g of silica were blended to produce 300 g of a solidifying agent according to the present invention.
そして、当該固化剤を例えば工場あるいは生コン車などから排出される生コンの残渣、すなわちセメントを含んだ濁水について、水と固形物との分離に使用した。例えば、前記生コンの残渣であるセメントを含んだ濁水中にセメントなどの固形物が５％乃至７％程度含まれているとき、本固化剤をその固形物の１割弱程度、すなわち例えば、０．２５％乃至０．３５％の固化剤を投入する。 Then, the solidifying agent was used for separating water and solid matter from, for example, the residue of raw concrete discharged from a factory or a raw concrete car, that is, turbid water containing cement. For example, when solid matter such as cement is contained in the turbid water containing cement which is the residue of the ready-mixed corn, about 5% to 7% of the solidifying agent is used, for example, about 10% of the solid matter. Add 25% to 0.35% solidifying agent.
そして、所定時間攪拌すると、水と固形物に分離した。該固形物は含水率８０％程度の固形物であり、充分に手で持てる程度に固まるものとなった。そしてその固形物内には六価クロムなどの重金属を閉じ込めることができた。よって分離した水には前記重金属は土壌環境基準値以上は排出されてはいないものであった。
And when it stirred for the predetermined time, it isolate | separated into water and a solid substance. The solid matter was a solid matter having a water content of about 80%, and became solid enough to be held by hand. And the heavy metal such as hexavalent chromium could be confined in the solid. Therefore, the heavy metal was not discharged above the soil environmental standard value in the separated water.
Claims (3)
前記セメント汚泥水内にセメント泥の固形物が３０％ないし２０％含まれているとき、前記セメント汚泥水内に前記構成からなる重金属被覆固化剤を前記セメント泥の固形物の重量の１割程度を投与して攪拌し、セメント汚泥水を水と固形物とに分離し、該固形物は、内部に重金属を閉じこめて、含水率８０％程度の手で持てる程度に固まり、前記分離した水には、前記重金属が含まれない、
ことを特徴とするセメント汚泥水の処理方法。
28 to 68 parts by weight of paper sludge, 10 to 50 parts by weight of soluble anhydrite, 3 to 43 parts by weight of sulfuric acid band, 8 to 48 parts by weight of slaked lime, 0.4 to 28 parts by weight of soda ash, and Portland cement 0.3 to 26 parts by weight, 0.1 to 11 parts by weight of anionic polymer excellent in separation treatment of neutral to alkaline sludge water, 0.15 to 23 parts by weight of sodium thiosulfate, and sulfuric acid first A method for treating cement sludge discharged from a factory or construction site using a heavy metal coating solidifying agent containing 0.1 to 22 parts by weight of iron and 0.05 to 21 parts by weight of silica. Yes,
When the cement sludge water contains 30% to 20% of cement sludge solids, the heavy metal coating solidifying agent having the above structure is added to the cement sludge water about 10% of the weight of the cement sludge solids. The cement sludge water is separated into water and solid matter, and the solid matter is solidified so that it can be held in a hand with a moisture content of about 80% by confining heavy metal inside. Does not contain the heavy metal,
A method for treating cement sludge water.
前記セメントを含んだ濁水内にセメントの固形物が５％ないし７％含まれているとき、前記セメントを含んだ濁水に、該セメントの固形物の１割程度の重量の前記重金属被覆固化剤を投与して攪拌し、セメントを含んだ濁水を水と固形物とに分離し、該固形物は、内部に重金属を閉じこめて、含水率８０％程度の手で持てる程度に固まり、前記分離した水には、前記重金属が含まれない、
ことを特徴とするセメント汚泥水の処理方法。
178 to 218 parts by weight of paper sludge, 10 to 50 parts by weight of soluble anhydrite, 3 to 43 parts by weight of sulfuric acid band, 8 to 48 parts by weight of slaked lime, 0.4 to 28 parts by weight of soda ash, and Portland cement 0.3 to 26 parts by weight, 0.1 to 11 parts by weight of anionic polymer excellent in separation treatment of neutral to alkaline sludge water, 0.15 to 23 parts by weight of sodium thiosulfate, and sulfuric acid first Treatment of muddy water containing cement discharged from a factory or ready-mixed vehicle using a heavy metal coating solidifying agent containing 0.1 to 22 parts by weight of iron and 0.05 to 21 parts by weight of silica Is the way
When 5% to 7% of cement solids are contained in the turbid water containing cement, the heavy metal-coated solidifying agent having a weight of about 10% of the cement solids is added to the turbid water containing cement. The turbid water containing cement is separated into water and solid matter, and the solid matter is solidified so that it can be held by hand with a moisture content of about 80%. Does not include the heavy metal,
A method for treating cement sludge water.
ことを特徴とする請求項１または請求項２記載のセメント汚泥水の処理方法。 The Portland cement is usually, early strength, super early strength, moderate heat, mixed with any one kind of various Portland cements of sulfate resistance, or any cement selected.
The method for treating cement sludge water according to claim 1 or 2, characterized in that .
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