JP2001047062A - Treatment of leachate from landfill site - Google Patents
Treatment of leachate from landfill siteInfo
- Publication number
- JP2001047062A JP2001047062A JP11225477A JP22547799A JP2001047062A JP 2001047062 A JP2001047062 A JP 2001047062A JP 11225477 A JP11225477 A JP 11225477A JP 22547799 A JP22547799 A JP 22547799A JP 2001047062 A JP2001047062 A JP 2001047062A
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- JP
- Japan
- Prior art keywords
- leachate
- calcium
- calcium carbonate
- sludge
- reaction tank
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ごみ埋立地から浸
出する浸出水（以下、単に「浸出水」と記す場合があ
る。）の処理方法に係り、詳しくは、該浸出水中に含ま
れる無機化合物、重金属類及び有機化合物を処理するに
当り、特にカルシウム化合物を主とする無機汚泥の含水
率及びその発生量を低減して、汚泥脱水設備の規模の縮
減又は省略を可能とすると共に、無機汚泥の移送配管や
ポンプ類の閉塞を有効に防止する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating leachate leached from a landfill (hereinafter sometimes simply referred to as "leachate"). In treating compounds, heavy metals and organic compounds, it is possible to reduce the water content of inorganic sludge mainly containing calcium compounds and the amount of the generated sludge, thereby making it possible to reduce or eliminate the scale of sludge dewatering equipment. The present invention relates to a method for effectively preventing blockage of sludge transfer piping and pumps.
【０００２】[0002]
【従来の技術】従来の浸出水の処理方法としては、浸出
水にアルカリ剤を添加して凝集沈殿処理することにより
カルシウムイオンを除去した後、生物処理して窒素、Ｂ
ＯＤ及びＣＯＤを除去し、その後酸性にて凝集沈澱処理
して生物未分解のＣＯＤを除去し、次いで、濾過した後
活性炭吸着処理し、更に減菌処理して放流する方法が一
般的である。2. Description of the Related Art As a conventional method for treating leachate, an alkaline agent is added to leachate to remove calcium ions by coagulation and sedimentation, and then biologically treated to remove nitrogen and B.
It is a common method to remove OD and COD, and then remove the undegraded COD by coagulation and sedimentation under acidic conditions, then filter, activate carbon adsorbent, sterilize and release.
【０００３】なお、上記処理方法において、生物処理の
前段の凝集沈殿処理は、必要に応じて行われる工程であ
るが、近年、埋め立て物の主体が焼却灰となるにつれ、
焼却施設の排気ガス中に含まれる塩素ガスを除去するた
めに使用されているカルシウム化合物（消石灰等）が塩
化カルシウムとなって焼却灰と共に埋め立て処分され、
これが雨水等に溶解することで、カルシウムイオンや塩
化物イオンが高濃度で含まれる浸出水が発生するように
なってきていることから、生物処理の前段にアルカリ剤
添加による凝集沈澱処理でカルシウムを除去する工程を
設ける場合が多くなってきている（特公平７−１００１
５５号公報）。[0003] In the above-mentioned treatment method, the coagulation and sedimentation treatment before the biological treatment is a step performed as necessary. In recent years, as the main body of landfills has become incinerated ash,
Calcium compounds (slaked lime, etc.) used to remove chlorine gas contained in the exhaust gas of incineration facilities are converted into calcium chloride and landfilled with incineration ash.
Since this is dissolved in rainwater, etc., leachate containing high concentrations of calcium ions and chloride ions is being generated, so calcium is removed by coagulation and sedimentation by adding an alkali agent prior to biological treatment. In many cases, a removal step is provided (Japanese Patent Publication No. 7-1001).
No. 55).
【０００４】このアルカリ剤によるカルシウムイオンの
除去は、下記反応によりカルシウムイオンをアルカリ領
域で難溶性の炭酸カルシウム汚泥として析出させ、固液
分離する方法である。 Ｃａ2+＋ＣＯ3 2-→ＣａＣＯ3 [0004] The removal of calcium ions by an alkali agent is a method in which calcium ions are precipitated as sparingly soluble calcium carbonate sludge in an alkali region by the following reaction, followed by solid-liquid separation. Ca 2+ + CO 3 2- → CaCO 3
【０００５】[0005]
【発明が解決しようとする課題】しかし、上記アルカリ
剤による凝集沈澱処理では、 炭酸カルシウムの不溶化物は凝集性が悪く、凝集剤
を添加して凝集処理した後固液分離を行っても、高含水
率の汚泥しか得られず、しかもその発生量が多いため
に、汚泥の脱水設備として規模の大きなものが必要とな
る。 発生する炭酸カルシウム汚泥の粘性が高いため、汚
泥の移送配管やポンプ類が閉塞し、トラブルが発生す
る。 などの問題があった。However, in the above-mentioned coagulation precipitation treatment with an alkali agent, the insolubilized calcium carbonate has poor cohesiveness. Since only sludge having a water content can be obtained and the amount of generated sludge is large, a large-scale sludge dewatering facility is required. Due to the high viscosity of the generated calcium carbonate sludge, the sludge transfer piping and pumps are blocked, causing trouble. There was such a problem.
【０００６】本発明は上記従来の問題点を解決し、ごみ
埋立地から浸出した浸出水中のカルシウムイオンを除去
した後、生物処理する方法において、炭酸カルシウム汚
泥の含水率及び発生量を低減して汚泥脱水設備を小型化
又は不要化すると共に、汚泥の移送配管やポンプ類の閉
塞の問題を解消する方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. In a method for removing calcium ions in leachate leached from a landfill and then performing biological treatment, the water content and the amount of generated calcium carbonate sludge are reduced. It is an object of the present invention to provide a method for reducing the size or eliminating the need for sludge dewatering equipment and for solving the problem of blockage of sludge transfer piping and pumps.
【０００７】[0007]
【課題を解決するための手段】本発明のごみ埋立地から
の浸出水の処理方法は、ごみ埋立地からの浸出水をカル
シウム除去工程でカルシウムを除去した後、生物処理す
る方法において、該カルシウム除去工程は、炭酸カルシ
ウムの種晶が充填された反応槽に前記浸出水を流入させ
ると共に、アルカリを添加してカルシウムイオンを該種
晶の表面に炭酸カルシウムとして析出させる工程である
ことを特徴とする。The method for treating leachate from a landfill according to the present invention is a method for biologically treating leachate from a landfill by removing calcium in the calcium removal step and then biologically treating the leachate. The removing step is a step of flowing the leachate into a reaction vessel filled with a seed crystal of calcium carbonate and adding an alkali to precipitate calcium ions as calcium carbonate on the surface of the seed crystal. I do.
【０００８】炭酸カルシウムの種晶が充填された反応槽
に浸出水を流入させると共に、アルカリを添加してカル
シウムイオンを種晶の表面に炭酸カルシウムとして析出
させる晶析法によれば、浸出水中のカルシウムイオン
を、脱水性が非常に高く、粒径が大きくかつ低粘性の炭
酸カルシウム結晶として効率的に分離することができ
る。According to a crystallization method in which leachate is caused to flow into a reaction vessel filled with calcium carbonate seed crystals and an alkali is added to precipitate calcium ions as calcium carbonate on the surface of the seed crystals, Calcium ions can be efficiently separated as calcium carbonate crystals having a very high dehydration property, a large particle size and low viscosity.
【０００９】なお、本発明において、この晶析反応槽の
型式は、固定床、流動床のいずれでも良いが、析出物の
固着による通水不良を防止するために、流動床方式とす
るのが好ましい。In the present invention, the type of the crystallization reaction tank may be either a fixed bed or a fluidized bed. However, in order to prevent poor water flow due to fixation of precipitates, a fluidized bed system is used. preferable.
【００１０】[0010]
【発明の実施の形態】以下に図面を参照して本発明の実
施の形態を詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００１１】図１は本発明のごみ埋立地からの浸出水の
処理方法の実施の形態を示す系統図であり、図２はカル
シウム除去工程を示す系統図である。FIG. 1 is a system diagram showing an embodiment of a method for treating leachate from a landfill according to the present invention, and FIG. 2 is a system diagram showing a calcium removing step.
【００１２】図１の方法では、沈砂池１にて砂、泥等を
除去した浸出水を、炭酸カルシウムの種晶が充填された
晶析反応槽２に導入すると共にアルカリ剤を添加して、
浸出水中のカルシウムイオンを炭酸カルシウムとして種
晶の表面に析出させる。In the method of FIG. 1, leachate from which sand, mud, etc. have been removed in a sand basin 1 is introduced into a crystallization reaction tank 2 filled with calcium carbonate seed crystals, and an alkali agent is added thereto.
Calcium ions in the leachate are precipitated as calcium carbonate on the surface of the seed crystal.
【００１３】この晶析反応の前処理としては、晶析反応
槽２における目詰り等を防止するために行うためのもの
であり、懸濁物質（ＳＳ成分）が除去できるものであれ
ば良く、通常の濾過器やフィルタ等を用いることもでき
る。The pretreatment of the crystallization reaction is performed to prevent clogging or the like in the crystallization reaction tank 2 and may be any treatment capable of removing suspended substances (SS components). Ordinary filters, filters and the like can also be used.
【００１４】晶析反応槽２では、炭酸ナトリウム（Ｎａ
2ＣＯ3）、又は炭酸水素ナトリウム（ＮａＨＣＯ3）と
苛性ソーダ（ＮａＯＨ）等の炭酸イオンとアルカリ剤の
存在下、下記の反応で浸出水中のカルシウムが炭酸カル
シウムとして種晶の表面に析出する。 Ｃａ2+＋ＣＯ3 2-→ＣａＣＯ3 Ｃａ2+＋ＯＨ-＋ＨＣＯ3 -→ＣａＣＯ3＋Ｈ2Ｏ この晶析反応槽２内のｐＨは、９．５〜１０．５程度と
なるようにアルカリ剤を添加するのが好ましい。なお、
アルカリ剤は晶析反応槽２に添加されるのが好ましい
が、それよりも前の段階で、あるいは後述のように循環
する被処理水に添加されてもよい。In the crystallization reaction tank 2, sodium carbonate (Na
In the presence of carbonate ions such as 2 CO 3 ) or sodium hydrogen carbonate (NaHCO 3 ) and caustic soda (NaOH) and an alkali agent, calcium in the leachate is precipitated on the surface of the seed crystal as calcium carbonate by the following reaction. Ca 2+ + CO 3 2- → CaCO 3 Ca 2+ + OH − + HCO 3 − → CaCO 3 + H 2 O An alkaline agent is added so that the pH in the crystallization reaction tank 2 is about 9.5 to 10.5. It is preferred to add. In addition,
The alkali agent is preferably added to the crystallization reaction tank 2, but may be added at an earlier stage or to the circulating water to be treated as described later.
【００１５】この晶析反応槽２の型式には特に制限はな
く、固定床であっても流動床であっても良いが、析出物
の固着による通水不良を防止する上で、流動床方式とす
ることが好ましい。The type of the crystallization reaction tank 2 is not particularly limited, and it may be a fixed bed or a fluidized bed. It is preferable that
【００１６】この晶析反応槽２に充填する種晶として
は、炭酸カルシウム結晶の他、砂やガラス粒子等の低溶
解度の無機化合物の粒子の表面に炭酸カルシウムを析出
付着させたものを用いることができる。As the seed crystal to be filled in the crystallization reaction tank 2, a substance in which calcium carbonate is deposited and adhered to the surface of low-solubility inorganic compound particles such as sand and glass particles in addition to calcium carbonate crystals is used. Can be.
【００１７】本実施例では、具体的には図２に示す如
く、前処理水（沈砂池で砂、泥等を除去した浸出水）を
晶析反応槽２の下部から流入させると共に、アルカリ剤
を晶析反応槽２の下部の側部から１段〜複数段（図２に
おいては３段）で注入し、晶析反応槽２の流出水を循環
槽２Ａに受け、一部、好ましくは前処理水の１〜１０倍
量をポンプ２Ｂで晶析反応槽２の底部に循環させると共
に、残部を処理水として後段の生物処理槽３に送給す
る。In this embodiment, specifically, as shown in FIG. 2, pretreatment water (leaching water from which sand, mud, etc. has been removed in a sand basin) is allowed to flow in from the lower portion of the crystallization reaction tank 2 and an alkaline agent is used. Is injected in one to a plurality of stages (three stages in FIG. 2) from the lower side of the crystallization reaction tank 2, and the effluent of the crystallization reaction tank 2 is received in the circulation tank 2 </ b> A and partially, preferably, 1 to 10 times the amount of the treated water is circulated to the bottom of the crystallization reaction tank 2 by the pump 2B, and the remainder is sent to the subsequent biological treatment tank 3 as treated water.
【００１８】このように、晶析反応槽２の流出水の一部
を循環処理することにより、炭酸カルシウム結晶の成長
を促進すると共にカルシウム除去率を高め、より一層取
り扱い性に優れた炭酸カルシウム結晶を得ると共に、高
水質の処理水を得ることができる。As described above, by circulating a part of the effluent of the crystallization reaction tank 2, the growth of the calcium carbonate crystal is promoted, the calcium removal rate is increased, and the calcium carbonate crystal having more excellent handleability is obtained. , And high-quality treated water can be obtained.
【００１９】この晶析反応槽２の塔内流速については特
に制限はないが、７０〜１４０ｍ3／ｍ2／ｈｒ、特に１
００ｍ3／ｍ2／ｈｒ程度とするのが好ましい。The flow rate in the crystallization reaction tank 2 is not particularly limited, but is preferably 70 to 140 m 3 / m 2 / hr, particularly 1 to 140 m 3 / m 2 / hr.
It is preferably about 00 m 3 / m 2 / hr.
【００２０】炭酸カルシウムの析出反応が進行すること
により、塔内の結晶が成長し、大粒子化してくるので、
ある程度の大きさに結晶が成長したら晶析反応槽２の下
部から結晶を引き抜く。この結晶の引き抜きは、バルブ
による引き抜き或いはエアリフト方式による引き抜き等
で行うことができる。As the precipitation reaction of calcium carbonate proceeds, the crystals in the column grow and become large particles.
When the crystals have grown to a certain size, the crystals are pulled out from the lower part of the crystallization reaction tank 2. The crystal can be pulled out by a valve or by an air lift method.
【００２１】このようにして得られる炭酸カルシウム結
晶は、含水率１０〜３０％程度の低含水率で脱水性に優
れた粒径１〜２ｍｍ程度の比較的粒径の大きいペレット
状の結晶であり、その後の取り扱い性に優れ、特に脱水
機等で脱水を行わなくても、例えば水切り金網等で水切
り、風乾するのみで回収することができ、場合によって
は直接袋詰めすることもできる。The calcium carbonate crystal thus obtained is a pellet-shaped crystal having a relatively small water content of about 10 to 30% and a relatively large particle diameter of about 1 to 2 mm, which is excellent in dehydration and has a good water dehydration property. It is excellent in handling properties thereafter, and can be recovered by, for example, draining with a drainage wire net or the like and air-drying without dewatering with a dehydrator or the like. In some cases, it can be directly bagged.
【００２２】また、このように晶析反応槽２における晶
析反応でカルシウムイオンを除去することにより、通常
の場合、カルシウムイオン濃度１００〜１０００ｍｇ／
Ｌ程度の浸出水中のカルシウムイオンを５〜２０ｍｇ／
Ｌ程度にまで低減することができる。Further, by removing calcium ions by the crystallization reaction in the crystallization reaction tank 2 as described above, a calcium ion concentration of 100 to 1000 mg /
5 to 20 mg / l of calcium ions in leachate
It can be reduced to about L.
【００２３】晶析反応槽２でカルシウムイオンを除去し
た水は、常法に従って生物処理槽３、酸性凝集処理槽
４、濾過器５、活性炭吸着塔６及び減菌装置７で順次処
理され、最終処理水は放流される。The water from which calcium ions have been removed in the crystallization reaction tank 2 is sequentially treated in a biological treatment tank 3, an acidic coagulation treatment tank 4, a filter 5, an activated carbon adsorption tower 6, and a sterilizer 7 according to a conventional method. Treated water is discharged.
【００２４】即ち、生物処理槽３においては、必要に応
じて添加されるリン酸、メタノール等の栄養源の存在
下、窒素、ＢＯＤ、ＣＯＤが除去される。酸性凝集沈殿
槽４においては、ｐＨ５〜６程度の酸性にて、塩化第二
鉄、硫酸第二鉄等の凝集剤で生物未分解のＣＯＤが凝集
処理され、この凝集汚泥は砂濾過器、二層濾過器等の濾
過器５で除去される。濾過器５の濾過水は活性炭吸着塔
６で更に着色成分や残留ＣＯＤ成分等が吸着された後、
次亜塩素酸ナトリウムの注入又は紫外線照射等の減菌装
置７で殺菌処理された後、放流される。That is, in the biological treatment tank 3, nitrogen, BOD, and COD are removed in the presence of nutrients such as phosphoric acid and methanol added as necessary. In the acidic coagulation sedimentation tank 4, COD that has not been biodegraded is coagulated with a coagulant such as ferric chloride or ferric sulfate at an acidity of about pH 5 to 6, and the coagulated sludge is subjected to sand filtration using a sand filter. It is removed by a filter 5 such as a bed filter. After the filtered water from the filter 5 is further adsorbed by the activated carbon adsorption tower 6 on the coloring component and the residual COD component,
After being sterilized by a sterilizer 7 such as sodium hypochlorite injection or ultraviolet irradiation, it is discharged.
【００２５】[0025]
【実施例】以下に実施例及び比較例を挙げて本発明をよ
り具体的に説明する。The present invention will be described more specifically below with reference to examples and comparative examples.
【００２６】実施例１ 図１に示す本発明の方法により下記水質の浸出水の処理
を行った。 [浸出水水質] ｐＨ ： ７．８ ＢＯＤ ： １２０ｍｇ／Ｌ ＣＯＤ ： ２３０ｍｇ／Ｌ Ｔ−Ｎ ： １００ｍｇ／Ｌ カルシウムイオン： ４００ｍｇ／Ｌ 処理水量は５００Ｌ／ｈｒ（１２ｍ3／日）とし、晶析
反応槽へはアルカリ剤としてはＮａ2ＣＯ3を０．１ｍｏ
ｌ／Ｌ添加し、晶析反応槽内のｐＨを約１０とした。ま
た、この反応槽には、ＣａＣＯ3ペレット（平均粒径
０．５ｍｍ）を予め充填し、流動床を形成した。晶析反
応槽内の流速は１００ｍ3／ｍ2／ｈｒとし、流出水のう
ちの前処理水の４倍量は循環処理した。Example 1 Leachate having the following water quality was treated by the method of the present invention shown in FIG. [Leachate quality] pH: 7.8 BOD: 120 mg / L COD: 230 mg / L TN: 100 mg / L Calcium ion: 400 mg / L The amount of treated water was 500 L / hr (12 m 3 / day), and the crystallization reaction was performed. 0.1 mol of Na 2 CO 3 as alkaline agent to tank
1 / L was added to adjust the pH in the crystallization reaction tank to about 10. In addition, this reaction tank was previously filled with CaCO 3 pellets (average particle size: 0.5 mm) to form a fluidized bed. The flow rate in the crystallization reaction tank was set to 100 m 3 / m 2 / hr, and four times the amount of the pretreated water in the effluent was circulated.
【００２７】また、晶析反応槽以降の各設備の仕様及び
処理条件は次の通りとした。The specifications and processing conditions of each equipment after the crystallization reaction tank were as follows.
【００２８】 生物処理槽： 方式 ： 循環法硝化脱窒 硝化槽ｐＨ ： ７．５ 脱窒層メタノール添加量 ： ３６００ｇ／日 沈殿槽容量 ： ６ｍ3 酸性凝集処理槽： 添加凝集剤 ： 塩化第二鉄，５０ｍｇ／Ｌ（鉄として） 槽内ｐＨ ： ６．０ 濾過器： 方式 ： 下向流 充填材 ： アンスラサイト，砂 活性炭吸着塔： 方式 ： 固定床下向流 活性炭充填層 ： 直径０．３ｍ×高さ２ｍ ＳＶ ： ４ｍ・ｈｒ-1 滅菌装置： 方式 ： 次亜塩素酸ナトリウム注入 得られた最終処理水の水質及び晶析反応槽から抜き出し
た炭酸カルシウム汚泥の含水率は表１に示す通りであっ
た。Biological treatment tank: Method: Nitrification and denitrification by circulation method Nitrification tank pH: 7.5 Denitrification layer methanol addition amount: 3600 g / day Sedimentation tank capacity: 6 m 3 Acid coagulation treatment tank: Added coagulant: ferric chloride , 50 mg / L (as iron) Tank pH: 6.0 Filter: Method: Downflow Filler: Anthracite, sand Activated carbon adsorption tower: Method: Fixed bed Downflow Activated carbon packed bed: Diameter 0.3m × H 2 m SV: 4 m · hr -1 Sterilizer: Method: Injection of sodium hypochlorite The water quality of the final treated water obtained and the water content of calcium carbonate sludge extracted from the crystallization reaction tank are as shown in Table 1. Was.
【００２９】比較例１ 実施例１において、カルシウム除去工程において、晶析
を行わず、アルカリ剤としてＮａ2ＣＯ3を０．１ｍｏｌ
／Ｌ添加してｐＨ１０に調整し、その後凝集沈殿処理を
行ったこと以外は同様にして処理を行った。Comparative Example 1 In Example 1, crystallization was not carried out in the step of removing calcium, and 0.1 mol of Na 2 CO 3 was used as an alkaline agent.
/ L was added to adjust the pH to 10, and then the treatment was performed in the same manner except that the aggregation and precipitation treatment was performed.
【００３０】得られた最終処理水の水質及び凝集沈殿槽
から抜き出した炭酸カルシウム汚泥の含水率は表１に示
す通りであった。The quality of the final treated water obtained and the water content of the calcium carbonate sludge extracted from the coagulation sedimentation tank were as shown in Table 1.
【００３１】[0031]
【表１】 [Table 1]
【００３２】表１より次のことが明らかである。The following is clear from Table 1.
【００３３】即ち、実施例１と比較例１とでは、最終処
理水の水質には大きな差はないものの、カルシウム除去
工程で得られる炭酸カルシウムの汚泥の含水率が大きく
異なり、また粒径も実施例１では約２ｍｍと大きいた
め、汚泥処理のハンドリングが大幅に改善された。ま
た、比較例１では炭酸カルシウム汚泥の凝集沈殿槽の汚
泥引き抜き配管が頻繁に閉塞したが、実施例１では配管
閉塞等のトラブルは発生しなかった。That is, although there is no great difference in the quality of the final treated water between Example 1 and Comparative Example 1, the water content of the calcium carbonate sludge obtained in the calcium removing step is significantly different, and the particle size is also different. In Example 1, since it was as large as about 2 mm, the handling of sludge treatment was greatly improved. Further, in Comparative Example 1, the sludge extraction pipe of the flocculation settling tank for calcium carbonate sludge was frequently blocked, but in Example 1, no trouble such as pipe blockage occurred.
【００３４】[0034]
【発明の効果】以上詳述した通り、本発明のごみ埋立地
からの浸出水の処理方法によれば、ごみ埋立地浸出水の
処理において、従来のアルカリ剤添加凝集沈殿処理によ
るカルシウム除去に比べて汚泥発生量を大幅に低減させ
ると共に、低含水率の炭酸カルシウム結晶を析出させる
ことで、後段の汚泥脱水設備を小型化ないし不要化する
ことができ、システム全体を小型化すると共に、設備コ
ストを大幅に低減することができる。また、晶析により
得られる炭酸カルシウムの結晶は、比較的粒径が大き
く、粘性の低いものであることから、取り扱い性に優れ
ると共に、汚泥の移送配管やポンプ類の閉塞の問題も解
消され、処理設備を長期に亘り安定且つ効率的に運転す
ることが可能となる。As described above in detail, according to the method for treating leachate from a landfill according to the present invention, in the treatment of leachate from a landfill, compared with the conventional method of removing calcium by coagulation and sedimentation with an alkali agent. By greatly reducing the amount of sludge generated and depositing calcium carbonate crystals with a low water content, the subsequent sludge dewatering equipment can be made smaller or unnecessary, and the entire system can be made smaller and the equipment cost reduced. Can be greatly reduced. In addition, the calcium carbonate crystals obtained by crystallization have relatively large particle diameters and low viscosity, so they are excellent in handleability and the problem of clogging of sludge transfer pipes and pumps is solved. Processing equipment can be operated stably and efficiently for a long period of time.
【図１】本発明のごみ埋立地からの浸出水の処理方法の
実施の形態を示す系統図である。FIG. 1 is a system diagram showing an embodiment of a method for treating leachate from a landfill according to the present invention.
【図２】本発明に係るカルシウム除去工程を示す系統図
である。FIG. 2 is a system diagram showing a calcium removing step according to the present invention.
１ 沈砂池 ２ 晶析反応槽 ３ 生物処理槽 ４ 酸性凝集処理槽 ５ 濾過器 ６ 活性炭吸着塔 ７ 滅菌装置 REFERENCE SIGNS LIST 1 sand basin 2 crystallization reaction tank 3 biological treatment tank 4 acid coagulation treatment tank 5 filter 6 activated carbon adsorption tower 7 sterilizer
Claims (2)
去工程でカルシウムを除去した後、生物処理する方法に
おいて、 該カルシウム除去工程は、炭酸カルシウムの種晶が充填
された反応槽に前記浸出水を流入させると共に、アルカ
リを添加してカルシウムイオンを該種晶の表面に炭酸カ
ルシウムとして析出させる工程であることを特徴とする
ごみ埋立地からの浸出水の処理方法。1. A method for biological treatment after removing calcium from leachate from a landfill by a calcium removing step, wherein the calcium removing step comprises: placing the leachate in a reaction tank filled with a seed crystal of calcium carbonate. A process of causing leachate to flow in and adding alkali to precipitate calcium ions as calcium carbonate on the surface of the seed crystal.
応槽であることを特徴とするごみ埋立地からの浸出水の
処理方法。2. The method for treating leachate from a landfill according to claim 1, wherein the reaction tank is a fluidized bed reaction tank.
Priority Applications (1)
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|---|---|---|---|
| JP11225477A JP2001047062A (en) | 1999-08-09 | 1999-08-09 | Treatment of leachate from landfill site |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11225477A JP2001047062A (en) | 1999-08-09 | 1999-08-09 | Treatment of leachate from landfill site |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001047062A true JP2001047062A (en) | 2001-02-20 |
Family
ID=16829943
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11225477A Pending JP2001047062A (en) | 1999-08-09 | 1999-08-09 | Treatment of leachate from landfill site |
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| Country | Link |
|---|---|
| JP (1) | JP2001047062A (en) |
Cited By (4)
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| WO2013097460A1 (en) * | 2011-12-30 | 2013-07-04 | 深圳市能源环保有限公司 | Wastewater pre-treatment system and wastewater pre-treatment method |
| CN104107818A (en) * | 2014-07-18 | 2014-10-22 | 中国天辰工程有限公司 | Mobile scar eliminating method of adipic acid crystallizer |
| JP2017170275A (en) * | 2016-03-18 | 2017-09-28 | 栗田工業株式会社 | Method of removing calcium in highly alkaline water |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325400C (en) * | 2003-09-30 | 2007-07-11 | 深圳市宇力科技有限公司 | House refuse percolate treating method |
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| CN104107818A (en) * | 2014-07-18 | 2014-10-22 | 中国天辰工程有限公司 | Mobile scar eliminating method of adipic acid crystallizer |
| JP2017170275A (en) * | 2016-03-18 | 2017-09-28 | 栗田工業株式会社 | Method of removing calcium in highly alkaline water |
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