JP4683638B2 - Rapid dehydrating solidifying agent for treatment of high water content concentrated sludge - Google Patents
Rapid dehydrating solidifying agent for treatment of high water content concentrated sludge Download PDFInfo
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Description
本発明は、例えば、高含水比の濃縮汚泥などを急速に脱水し、かつ固化させる高含水比濃縮汚泥の処理を対象とした急速脱水固化剤に関するものである。
すなわち、前記高含水比をなす濃縮汚泥を吸湿脱水分離し、また当該濃縮汚泥中に含有する固形物と金属類（重金属類を含む）を再溶出することのない極めて安定した固形物として分離する。即ち、当該濃縮汚泥中の水分を急速に分離するとともに固形物を極めて安定した疎水性に富んだ脱水汚泥にし、さらに、脱水汚泥は再び水に溶解し崩壊することがなく、経時的に自然土壌に近似した泥質に改質する機能を兼ね備えた濃縮汚泥脱水剤にかかり、新規な急速脱水固化剤に関するものである。
The present invention relates to a rapid dehydrating and solidifying agent for treating a high water content concentrated sludge that rapidly dewaters and solidifies, for example, high water content concentrated sludge.
That is, the concentrated sludge having a high water content is subjected to moisture absorption and dehydration separation, and separated as a very stable solid that does not re-elute solids and metals (including heavy metals) contained in the concentrated sludge. . That is, the water in the concentrated sludge is rapidly separated and the solid matter is made into an extremely stable and hydrophobic dehydrated sludge. Further, the dehydrated sludge is dissolved again in water and does not collapse, It relates to a concentrated sludge dehydrating agent that has a function of modifying to a mud similar to that of a sludge, and relates to a novel rapid dehydrating solidifying agent.
濃縮汚泥の脱水に関する従来の処理法としては、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る水分の固定法が採用されている。
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ばれ、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ばれている。
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％前後必要としている。
さらに、セメント系または石灰系で処理された当該処理対象物には共通した問題点がある。それは処理後の固形物のｐH値が１０以上となりあらたにアルカリ流出の問題提起となっている。
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、汚泥の濃度が高いために凝集剤（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問題がある。
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.
Cement-based or lime-based moisture treatment is a self-curing reaction based on simple moisture absorption, so the amount of addition is determined by the moisture content in the treatment object, but usually requires about 30%.
Furthermore, the processing object processed by the cement system or the lime system has a common problem. That is, the pH value of the solid after the treatment becomes 10 or more, which causes a problem of alkali spillage.
Another conventional treatment method for dewatering concentrated sludge is to use a dehydrator, but because the concentration of sludge is high, a large amount of flocculant (inorganic or organic) needs to be added. Or problems such as difficulty in dehydration.
本発明は、従来の濃縮汚泥の脱水法における問題を解決するために多機能を兼ね備えた新規な急速脱水固化剤の提供を目的とする。
具体的には、（１）主要成分であるセメント、フライアッシュ、酸化カルシウムと塩化カルシウム、塩化マグネシウムの組み合わせによる水分吸収固定と水分吸湿分離を複合させる。（２）必須成分である硫酸アルミニウム、硫酸カルシウム、硫酸マグネシウム、チオ硫酸ナトリウム、ポリマー（有機系凝集剤）を組み合わせることにより主要成分の触媒として反応を促進するとともに分離水の浄化が図られ、また、処理後の固形物の性状を改質し安定化する他、重金属類も収着固定して安定させる。（３）補助成分である硫酸鉄、酸化けい素、珪藻土、パーライトは主要成分と必須成分の反応を補助する機能があり、安定した脱水処理と固形物の改質と固定化を助長する。
An object of the present invention is to provide a novel rapid dehydrating solidifying agent having multiple functions in order to solve the problems in the conventional dewatering method of concentrated sludge.
Specifically, (1) water absorption fixation and moisture absorption separation by a combination of cement, fly ash, calcium oxide, calcium chloride, and magnesium chloride as main components are combined. (2) Combining essential components such as aluminum sulfate, calcium sulfate, magnesium sulfate, sodium thiosulfate, and a polymer (organic coagulant) promotes the reaction as the main component catalyst and purifies the separated water. In addition to modifying and stabilizing the properties of the solid after treatment, it also stabilizes heavy metals by sorption and fixation. (3) Iron sulfate, silicon oxide, diatomaceous earth, and pearlite, which are auxiliary components, have a function of assisting the reaction between the main component and the essential component, and promote stable dehydration treatment, solid reforming and immobilization.
本発明による高含水比濃縮汚泥の処理を対象とした急速脱水固化剤は、
セメント１０〜５０重量部とフライアッシュ３０〜８０重量部と塩化カルシウム５〜２０重量部と塩化マグネシウム５〜２０重量部とを酸化カルシウム５〜１５重量部を主要成分とし、この主要成分１００重量部に対し、必須成分として硫酸アルミニウム５〜１０重量部と硫酸カルシウム１５〜２５重量部と硫酸マグネシウム５〜１０重量部とチオ硫酸ナトリウム５〜１０重量部とポリマー（有機系凝集剤）０．１〜０．２重量部と、補助成分として硫酸鉄１〜５重量部と酸化けい素５〜１０重量部と珪藻土５〜１０重量部とパーライト５〜１０重量部が配合された、
ことを特徴とし、
または、
前記のセメントは普通ポルトランドセメント、早強ポルトランドセメント、超早強ポルトランドセメント、中庸熱ポルトランドセメント、耐硫酸塩ポルトランドセメント、高炉セメント、フライアッシュセメント、アルミナ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、
ことを特徴とし、
または、
前記のフライアッシュは木灰または石炭灰であり、前記木灰または石炭灰の単体あるいは混合である、
ことを特徴とし、
または、
前記高含水比濃縮汚泥の処理を対象とした急速脱水固化剤には、珪藻土が５〜１０重量部配合されてなり、該珪藻土は淡水成珪藻土、海水成珪藻土から選ばれる一種または混合である、
ことを特徴とするものである。
The rapid dehydrating solidifying agent intended for the treatment of high water content concentrated sludge according to the present invention,
10 to 50 parts by weight of cement, 30 to 80 parts by weight of fly ash, 5 to 20 parts by weight of calcium chloride, and 5 to 20 parts by weight of magnesium chloride are used as main components of 5 to 15 parts by weight of calcium oxide, and 100 parts by weight of this main component In contrast, 5 to 10 parts by weight of aluminum sulfate, 15 to 25 parts by weight of calcium sulfate, 5 to 10 parts by weight of magnesium sulfate, 5 to 10 parts by weight of sodium thiosulfate, and 0.1 to 0.1% of polymer (organic flocculant) 0.2 parts by weight, 1 to 5 parts by weight of iron sulfate, 5 to 10 parts by weight of silicon oxide, 5 to 10 parts by weight of diatomaceous earth, and 5 to 10 parts by weight of pearlite were blended as auxiliary components ,
It is characterized by
Or
The above cement is one or any of ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, blast furnace cement, fly ash cement, and alumina cement. Is a mixture of choices,
It is characterized by
Or
The fly ash is wood ash or coal ash, and the wood ash or coal ash is a simple substance or a mixture,
It is characterized by
Or
The rapid dehydrating and solidifying agent for treating the high water content concentrated sludge is mixed with 5 to 10 parts by weight of diatomaceous earth, and the diatomaceous earth is one or a mixture selected from freshwater diatomaceous earth and marine diatomaceous earth.
It is characterized by this .
本発明にかかる高含水比濃縮汚泥の処理を対象とした急速脱水固化剤によれば、高含水比濃縮汚泥である処理対象物汚泥中に包含する水分を一部固定し、凝集遊離した分離水を放出し、さらに、脱水後の汚泥の性状を改質するなど顕著な効果を奏する。
よって、本発明にかかる高含水比濃縮汚泥の処理を対象とした急速脱水固化剤によれば、当該濃縮汚泥の土壌化を容易に図れることとなる。
According to the rapid dehydrating and solidifying agent for the treatment of the high water content concentrated sludge according to the present invention, the water contained in the treatment object sludge, which is the high water content concentrated sludge, is partially fixed, and the separated water separated and coagulated. In addition, it produces remarkable effects such as modifying the properties of sludge after dehydration.
Therefore, according to the rapid dehydrating solidifying agent intended for the treatment of the high water content concentrated sludge according to the present invention, the concentrated sludge can be easily made into soil.
本発明の急速脱水固化剤の主要成分はセメントとフライアッシュと塩化カルシウムと塩化マグネシウムと酸化カルシウムである。
これに必須成分として硫酸アルミニウムと硫酸カルシウムと硫酸マグネシウムとチオ硫酸ナトリウムとポリマー（有機系凝集剤）と補助成分として硫酸鉄と酸化けい素と珪藻土とパーライトが均一に配合されている。
The main components of the rapid dehydrating and solidifying agent of the present invention are cement, fly ash, calcium chloride, magnesium chloride and calcium oxide.
As essential components, aluminum sulfate, calcium sulfate, magnesium sulfate, sodium thiosulfate, a polymer (organic flocculant), and iron sulfate, silicon oxide, diatomaceous earth, and pearlite are uniformly mixed as auxiliary components.
前記のセメントはポルトランドセメント（普通、早強、超早強、中庸熱、耐硫酸塩）、高炉セメント、フライアッシュセメント、アルミナセメントから選ばれるが、実際には前記セメントの１種類または数種類を混合して配合され、水分の吸収・水和反応による凝集固化などの機能を付加することを目的としている。 The cement may be selected from Portland cement (ordinary, early strength, very early strength, moderate heat, sulfate resistant), blast furnace cement, fly ash cement, and alumina cement, but actually one or several of the cements are mixed. The purpose is to add functions such as coagulation and solidification by moisture absorption and hydration reactions.
前記のフライアッシュは樹皮灰（fly ash of bark）または、石炭灰（fly ash of coal）のいずれか一種類または混合して配合される。
フライアッシュに求められる機能は水分の吸収と保水、浄化能と自己硬化能であるが、フライアッシュには材料材質によりその性状と性能が異なる。例えば、パルプ剤（pulp wood ）とその樹皮 （bark）、製紙汚泥 （paper sludge）、石炭の場合は産地によってその差異を認知することができる。
本発明の急速脱水固化剤に適合するフライアッシュについては、経験的に基準となる成分比を設定しているので、配合するか補足するなりして調整することができる。経験的見地からすれば、Ｓｉ／Ａｌ／Ｃａ／Ｍｇ比と炭素比さらに、微量元素（ミネラル成分）の触媒能が重要な要素となっているとの知見を得ている。
The fly ash is blended with one or a mixture of fly ash of bark and fly ash of coal.
The functions required of fly ash are moisture absorption and water retention, purification ability and self-curing ability, but fly ash has different properties and performance depending on the material. For example, in the case of pulp wood and its bark, paper sludge, and coal, the difference can be recognized depending on the production area.
The fly ash suitable for the rapid dehydrating and solidifying agent of the present invention is empirically set as a reference component ratio, and can be adjusted by blending or supplementing. From an empirical point of view, it has been found that the Si / Al / Ca / Mg ratio and the carbon ratio and the catalytic ability of trace elements (mineral components) are important factors.
前記の塩化カルシウムと塩化マグネシウムと酸化カルシウムは吸湿性に富み乾燥剤として利用されている。この性質を最大限活用し水分の固定と分離、さらに、酸化カルシウムについては吸湿に伴う発熱反応が他の諸反応を促進する。 The aforementioned calcium chloride, magnesium chloride and calcium oxide are rich in hygroscopicity and are used as desiccants. Utilizing this property to the maximum, moisture fixation and separation, and for calcium oxide, the exothermic reaction accompanying moisture absorption promotes other reactions.
前記の硫酸アルミニウムは、該当処理対象物中の水分に溶解し重縮合水酸化アルミニウムに転化し、汚泥粒子間の電位を低下させて崩壊し細分化する機能と有機金属類の無機化または金属イオンの吸着・固定および酸化触媒能があり、該当処理対象物の団粒化と粒度調整および固化・固定化を促進する。 The above-mentioned aluminum sulfate is dissolved in the water in the object to be treated and converted into polycondensed aluminum hydroxide, the function of collapsing and subdividing by lowering the potential between sludge particles and the mineralization of organic metals or metal ions Adsorption / fixation and oxidation catalyzing ability, and promotes agglomeration and particle size adjustment and solidification / fixation of the object to be treated.
前記の硫酸マグネシウムは、該当処理対象物中に懸濁分散してその一部として硫酸アルミニウムの解離に伴い生成する遊離酸の中和剤としての機能と同時に凝集、固化、固定反応と分離水の浄化に寄与する。 The magnesium sulfate is suspended and dispersed in the object to be treated and functions as a neutralizing agent for free acid produced as a result of dissociation of aluminum sulfate as a part thereof, and simultaneously aggregates, solidifies, immobilizes reaction and separated water. Contributes to purification.
前記の硫酸マグネシウムは、該当処理対象物中の金属類（重金属類を含む）を固定する重要な要素である。また、主要成分の各水和反応を促進させる触媒的な機能を有し固化、安定化の強化に寄与する。 The magnesium sulfate is an important element for fixing metals (including heavy metals) in the object to be treated. In addition, it has a catalytic function to promote each hydration reaction of the main component and contributes to strengthening of solidification and stabilization.
前記のチオ硫酸ナトリウムは、重金属類と積極的に反応して水に不溶性のチオ硫酸金属化合物Na[Me(S3O3)2] を形成する。該当処理対象物中の数値に応じて配合比を調整する。 The sodium thiosulfate positively reacts with heavy metals to form a water-insoluble metal thiosulfate compound Na [Me (S3O3) 2]. The blending ratio is adjusted according to the numerical value in the target object.
前記のポリマー（有機系凝集剤）は分離水中の微細な懸濁物の凝集に寄与する。 The polymer (organic flocculant) contributes to the aggregation of a fine suspension in the separated water.
補助成分としての硫酸鉄と酸化けい素は、中和反応と凝集反応による団粒化と粒度調整および固化・固定化反応を助長する。珪藻土とパーライトは主要成分のセメント、フライアッシュの補助剤として寄与する。 Iron sulfate and silicon oxide as auxiliary components promote aggregation, particle size adjustment and solidification / fixation reaction by neutralization reaction and aggregation reaction. Diatomaceous earth and perlite contribute to cement and fly ash as main ingredients.
本発明の急速脱水固化剤の反応は極めて即効性があり、該当処理対象物即ち濃縮汚泥に添加混合することにより固形物中の水分は容易に遊離し重力分離する。水分を放出した固形物は疎水性で極めて安定し、性状も自然土壌に近似し、金属類（重金属類を含む）も固定された汚泥に改質される。
ここで、本発明による急速脱水固化剤の一例としての調整例につき説明する。
The reaction of the rapid dehydrating and solidifying agent of the present invention is very immediate, and the water in the solid is easily released and separated by gravity when added to and mixed with the object to be treated, that is, concentrated sludge. The solids from which moisture has been released are hydrophobic and extremely stable, the properties are similar to natural soil, and metals (including heavy metals) are also modified into fixed sludge.
Here, the adjustment example as an example of the rapid dehydration solidifying agent according to the present invention will be described.
主要成分としてセメント２５重量部、フライアッシュ（木灰）５５重量部、塩化カルシウム１０重量部、塩化マグネシウム５重量部、酸化カルシウム５重量部を配合する。 As main components, 25 parts by weight of cement, 55 parts by weight of fly ash (wood ash), 10 parts by weight of calcium chloride, 5 parts by weight of magnesium chloride, and 5 parts by weight of calcium oxide are blended.
必須成分としては、前記主要成分に対して硫酸アルミニウム５重量部、硫酸カルシウム１０重量部、硫酸マグネシウム５重量部、チオ硫酸ナトリウム５重量部、ポリマー０．２重量部を配合する。補助成分は主要成分に対して硫酸鉄２重量部、酸化けい素５重量部を配合する。 As essential components, 5 parts by weight of aluminum sulfate, 10 parts by weight of calcium sulfate, 5 parts by weight of magnesium sulfate, 5 parts by weight of sodium thiosulfate, and 0.2 parts by weight of polymer are blended with the main components. An auxiliary component mix | blends 2 weight part of iron sulfate and 5 weight part of silicon oxide with respect to the main component.
上記のように配合し、生成した本発明による急速脱水固化剤を添加して各汚泥の脱水試験を行った。
しかして、建設汚泥（廃ベントナイト）の二次脱水試験の結果を図１に示す。また、畜産汚泥（牛糞）の脱水試験の結果を図２に示す。さらに、下水処理場の濃縮汚泥の脱水試験結果を図３に示す。
Each sludge was subjected to a dewatering test by adding the rapid dehydrating solidifying agent according to the present invention that was blended and produced as described above.
Therefore, the result of the secondary dehydration test of construction sludge (waste bentonite) is shown in FIG. Moreover, the result of the dehydration test of livestock sludge (cow manure) is shown in FIG. Furthermore, the dehydration test result of the concentrated sludge in the sewage treatment plant is shown in FIG.
Claims (4)
With respect to 100 parts by weight of the main component containing 10 to 50 parts by weight of cement, 30 to 80 parts by weight of fly ash, 5 to 15 parts by weight of calcium chloride, 5 to 15 parts by weight of magnesium chloride, and 5 to 15 parts by weight of calcium oxide, As essential components 5-10 parts by weight of aluminum sulfate, 15-25 parts by weight of calcium sulfate, 5-10 parts by weight of magnesium sulfate, 5-10 parts by weight of sodium thiosulfate, and 0.1-0.2 parts by weight of organic flocculant A rapid dehydrating and solidifying agent for treating a high water content concentrated sludge characterized by containing 5 to 10 parts by weight of pearlite.
The above cement is one or any of ordinary Portland cement, early-strength Portland cement, ultra-early strong Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, blast furnace cement, fly ash cement, and alumina cement. 2. A rapid dehydrating solidifying agent for treating a high water content concentrated sludge according to claim 1, wherein the mixing is selected.
2. The rapid dehydrating solidifying agent for treating high water content concentrated sludge according to claim 1, wherein the fly ash is wood ash or coal ash, and the wood ash or coal ash is a simple substance or a mixture thereof.
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| CN107098549A (en) * | 2016-02-22 | 2017-08-29 | Ik株式会社 | Sludge solidifying agent and utilize its solidfied material preparation method |
| CN107098549B (en) * | 2016-02-22 | 2020-09-25 | Ik株式会社 | Sludge curing agent and preparation method of cured product using same |
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