JP2000210677A - Flocculating method of sludge - Google Patents
Flocculating method of sludgeInfo
- Publication number
- JP2000210677A JP2000210677A JP11316414A JP31641499A JP2000210677A JP 2000210677 A JP2000210677 A JP 2000210677A JP 11316414 A JP11316414 A JP 11316414A JP 31641499 A JP31641499 A JP 31641499A JP 2000210677 A JP2000210677 A JP 2000210677A
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- treated
- calcium
- calcium salt
- gypsum
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は凝集方法、特に、下
水等の難処理汚泥の凝集方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coagulation method, and more particularly to a coagulation method for difficult-to-treat sludge such as sewage.
【０００２】[0002]
【従来の技術】下水処理場では下水流入口の原水を幾槽
もの広大な沈殿槽に導いて、長時間をかけて沈殿処理が
行われ、その過程で凝集剤を用いて強制的に水分と固形
分を分離する処理、あるいはバイオ技術を駆使して、窒
素分の除去、ＢＯＤ，ＣＯＤを低下させる処理がなされ
ている。2. Description of the Related Art In a sewage treatment plant, raw water at a sewage inlet is guided to several large sedimentation tanks, and the sedimentation treatment is performed over a long period of time. A process of separating a solid content or a process of removing nitrogen content and reducing BOD and COD by making full use of biotechnology are performed.
【０００３】更に、家畜の糞尿はそのまま肥料にするこ
とができないため、一旦乾燥させたり、あるいは、発酵
処理をして肥料として使用するようにしている。Further, since manure of livestock cannot be directly used as fertilizer, it is once dried or subjected to a fermentation treatment and used as fertilizer.
【０００４】また、製紙排水には大量のリグニン酸が含
まれており、このリグニン酸が、ヘドロとなって河川の
底に長期に渡って蓄積すると悪臭を放つようになるた
め、有機、あるいは無機の凝集剤を使用して水分と分離
し、上澄み液のみを河川に放流するようになっている。Further, a large amount of lignic acid is contained in papermaking wastewater, and when this lignic acid becomes sludge and accumulates at the bottom of a river for a long period of time, it emits a foul odor, and is therefore organic or inorganic. The coagulant is used to separate from water, and only the supernatant is discharged into the river.
【０００５】このような凝集処理に使用される凝集剤と
しては種々のものが開発されている。例えば無機系では
アルミニウム塩（硫酸アルミニウム、水酸化アルミニウ
ム、アンモニウムミョウバン、カリミョウバン、アルミ
ン酸ナトリウム、ポリ塩化アルミニウム）、鉄塩（塩化
第一鉄、塩化第二鉄、硫酸第一鉄、硫酸第二鉄、ポリ硫
酸第二鉄等）、有機系では、低分子塩、界面活性剤、天
然あるいは合成の高分子物質等が開発され使用されてい
る。Various coagulants have been developed for use in such coagulation treatment. For example, in inorganic systems, aluminum salts (aluminum sulfate, aluminum hydroxide, ammonium alum, potassium alum, sodium aluminate, polyaluminum chloride), iron salts (ferrous chloride, ferric chloride, ferrous sulfate, ferrous sulfate) In the organic system, low molecular salts, surfactants, natural or synthetic high molecular substances, and the like have been developed and used.
【０００６】更に、本願出願人は特公平08-018016 に
て、可溶性のアルミニウム塩とアルカリ金属塩と上
記剤と剤の直接の接触密度を小さくするための第三
物質とよりなる凝集剤を提案し、多大な効果をあげてい
る。Further, the applicant of the present application proposed in Japanese Patent Publication No. 08-018016 a coagulant comprising a soluble aluminum salt and an alkali metal salt and a third substance for reducing the direct contact density between the above-mentioned agent and the agent. And it has a great effect.
【０００７】[0007]
【発明が解決しようとする課題】以上のように種々の凝
集剤が開発され使用されている現状ではあっても、上記
下水、製紙排水等を固液分離することは困難である。ま
た、下水の処理に至っては膨大な面積の沈殿層を必要と
し、処理時間も膨大となっているのが現状である。そし
て、有機凝集剤を大量に使用すると、コストが高くなる
とともに、上記の固液分離の困難性が増大するという問
題があった。。Although various coagulants have been developed and used as described above, it is difficult to carry out solid-liquid separation of the above-mentioned sewage and papermaking wastewater. In addition, sewage treatment requires an enormous area of sedimentation layer, and the treatment time is enormous at present. When a large amount of the organic flocculant is used, there is a problem that the cost is increased and the difficulty of the solid-liquid separation is increased. .
【０００８】一方、下水や家畜の糞尿に含まれる窒素分
を除去する方法は、上記のように従来ではバイオ処理し
か無かったが、この場合上記の膨大な面積の処理槽を必
要とし、結果として処理に非常に時間を要する欠点があ
った。また、ＢＯＤ、ＣＯＤを必要な基準にまで下げる
処理もバイオ処理によるより方法しか無く、上記窒素分
の除去と同様に膨大な処理時間を必要としていた。On the other hand, the conventional method for removing nitrogen contained in sewage and livestock excrement has only been biotreatment as described above, but in this case, a large-sized treatment tank as described above is required. There was a disadvantage that the processing required a very long time. In addition, there is only a method of lowering the BOD and COD to a necessary standard by a bio-processing, and an enormous processing time is required in the same manner as the above-described removal of nitrogen.
【０００９】本発明は上記従来の事情に鑑みて提案され
たものであって、無機剤のみを用いて迅速な凝集効果を
発揮し、しかも、従来技術では水と固形分の分離が不可
能な難処理液の処理も可能な凝集方法を提供し、更に、
バイオ処理を用いないで全窒素、全リン、ＣＯＤ等を著
しく小さくすることができる凝集方法を提供することを
目的とする。The present invention has been proposed in view of the above-mentioned conventional circumstances, and exhibits a rapid coagulation effect using only an inorganic agent. In addition, the prior art cannot separate water and solid components. Provide a coagulation method capable of treating difficult-to-treat liquids,
It is an object of the present invention to provide a coagulation method capable of remarkably reducing total nitrogen, total phosphorus, COD, and the like without using biotreatment.
【００１０】[0010]
【課題を解決するための手段】本発明は上記目的を達成
するために、被処理液に対してカルシウム塩、具体的に
は石膏または乳酸カルシウムを添加して攪拌した後、凝
集剤を添加するようにしている。According to the present invention, in order to achieve the above object, a calcium salt, specifically, gypsum or calcium lactate is added to a liquid to be treated, stirred, and then a coagulant is added. Like that.
【００１１】カルシウムは水溶液中の陰イオンと結びつ
きやすく、以下に説明する実験結果からも明らかなよう
に、特に硝酸イオンや燐酸イオンの形で被処理液中に存
在する窒素分やリンを除去するのに絶大の効果がある
他、タンニン酸、リグニン酸等窒素や燐を含まない物質
とも結合してこれを除去する効果がある。ただし、カル
シウムを組成とする化合物は一般に水に溶けにくく、水
酸化カルシウムで0,1 ％前後、炭酸カルシウムではほと
んど零に近い。これに比べて天然石膏は２〜３％、化学
石膏は８％前後の溶解度を持っており本発明の目的に適
合し、溶解度の高い化学石膏の方が好ましい。カルシウ
ム塩としてはこれらの他に乳酸カルシウムも使用可能で
ある。Calcium easily binds to anions in an aqueous solution and, as is clear from the experimental results described below, removes nitrogen and phosphorus present in the liquid to be treated, particularly in the form of nitrate ions and phosphate ions. In addition to its tremendous effect, it also has the effect of removing and binding to substances that do not contain nitrogen or phosphorus, such as tannic acid and lignic acid. However, compounds having a composition of calcium are generally hardly soluble in water, and are about 0.1% in calcium hydroxide and almost zero in calcium carbonate. Natural gypsum has a solubility of about 2% to 3%, and chemical gypsum has a solubility of about 8%, which is suitable for the purpose of the present invention. In addition to these, calcium lactate can also be used as the calcium salt.
【００１２】添加される石膏（カルシウム）の量は被処
理液に含まれる硝酸イオンや燐酸イオンあるいはタンニ
ン酸、リグニン酸の量によって決定されるが、下記の実
験のように、被処理液が下水の原水の場合でも、被処理
液１０００ｃｃに対して1g〜5g程度であった。The amount of gypsum (calcium) to be added is determined by the amount of nitrate ion or phosphate ion, tannic acid, or lignic acid contained in the liquid to be treated. In the case of raw water, the amount was about 1 g to 5 g per 1000 cc of the liquid to be treated.
【００１３】上記のように石膏を添加した後に、凝集処
理が行われる。この凝集処理に使用される凝集剤として
はどのような凝集剤を使用しても構わないが、本願出願
人は以下の実験で使用するように、セメントと石灰の混
合品に硫酸アルミニウム水容液を組み合わせることによ
って効果を上げている。更に、上記のような無機の凝集
剤に加えて、高分子凝集剤を極微量使用すると更に凝集
効果を上げることができる。After the gypsum is added as described above, a coagulation treatment is performed. As the coagulant used in this coagulation treatment, any coagulant may be used. However, as used in the following experiment, the applicant of the present invention added an aqueous solution of aluminum sulfate to a mixture of cement and lime. The effect is raised by combining. Further, when a very small amount of a polymer coagulant is used in addition to the inorganic coagulant as described above, the coagulation effect can be further enhanced.
【００１４】尚、上記石膏添加の後、凝集処理の前、あ
るいは、凝集処理の後の何れかの段階で、次亜塩素酸ソ
ーダ等の脱臭剤を添加すると、被処理液の匂いを消すこ
とが可能となる。[0014] If a deodorant such as sodium hypochlorite is added at any stage after the addition of the gypsum, before the coagulation treatment, or after the coagulation treatment, the odor of the liquid to be treated is eliminated. Becomes possible.
【００１５】[0015]
【実施例】（実施例１）北海道三笠市の下水道水放流口
（下水場への下水の取り入れ口）より得られる原水に対
して以下の処理をした。EXAMPLES (Example 1) The following treatment was performed on raw water obtained from a sewerage water discharge port (intake port of sewage into a sewage plant) in Mikasa City, Hokkaido.
【００１６】先ず、原水１０００ｃｃに対して、石膏３
ｇを添加し、攪拌した後、次亜塩素酸ソーダの３０％溶
液を２０ｇ添加した。その後凝集処理として、セメント
５０％と消石灰５０％の凝集助剤を加え、次いで、濃度
３０％の硫酸アルミニウム溶液を６．３ｇおよび、カチ
オン系の高分子凝集剤の０．１％水溶液を２０ｇ添加し
て攪拌した。First, plaster 3 is applied to 1000 cc of raw water.
g, and after stirring, 20 g of a 30% solution of sodium hypochlorite was added. Thereafter, as a coagulation treatment, a coagulation aid of 50% cement and 50% slaked lime was added, and then 6.3 g of a 30% aluminum sulfate solution and 20 g of a 0.1% aqueous solution of a cationic polymer coagulant were added. And stirred.
【００１７】これによって、１５秒から３０秒で固形分
が沈降するので、濾紙で固形分を除去した処理水を分析
すると、下記の表１に示すような結果が得られ、しかも
この処理水は透明であった。As a result, the solids settle out in 15 to 30 seconds. When the treated water from which the solids have been removed by filter paper is analyzed, the results shown in Table 1 below are obtained. It was transparent.
【００１８】[0018]
【表１】 [Table 1]
【００１９】上記表１によると、ＣＯＤ，全窒素、全リ
ンとも著しく減少していることが理解できる。According to Table 1 above, it can be understood that COD, total nitrogen and total phosphorus are all significantly reduced.
【００２０】（実施例２）北海道栗山町の下水道流入口
の原水を上記同様処理した結果を下記の表２に記述す
る。Example 2 The results of treating the raw water at the inlet of the sewer in Kuriyama-cho, Hokkaido, in the same manner as described above are shown in Table 2 below.
【００２１】[0021]
【表２】 [Table 2]
【００２２】原水のＣＯＤ、全窒素量、全燐とも実施例
１より高いため、処理水のそれらも高くなっている。Since COD, total nitrogen content and total phosphorus in raw water are higher than those in Example 1, those in treated water are also higher.
【００２３】（実施例３）愛知県Ｗ団地の下水道流入口
の原水を上記同様処理した結果を下記の表３に記述す
る。(Example 3) The results of treating the raw water at the sewage inlet of the W complex in Aichi prefecture in the same manner as described above are shown in Table 3 below.
【００２４】[0024]
【表３】 [Table 3]
【００２５】これも実施例２と同様、原水のＣＯＤ、全
窒素量、全燐とも実施例１より高いため、処理水のそれ
らも高くなっている。As in Example 2, the COD, the total nitrogen content, and the total phosphorus in the raw water are higher than those in Example 1, so that those in the treated water are also higher.
【００２６】（実施例４）千葉県手賀沼湖の汚泥から分
離した原水を上記同様処理した結果を下記の表４に記述
する。(Example 4) The results of treating raw water separated from sludge from Lake Teganuma in Chiba Prefecture in the same manner as described above are described in Table 4 below.
【００２７】[0027]
【表４】 [Table 4]
【００２８】（実施例５）高砂市伊保下水処理場の原水
を上記同様処理した結果を下記の表５に記述する。(Example 5) The results of treating raw water at the Iho sewage treatment plant in Takasago City in the same manner as above are described in Table 5 below.
【００２９】[0029]
【表５】 [Table 5]
【００３０】（実施例６）同様に添加する石膏の量を原
水１０００ｃｃに対して３ｇとした場合の、北海道下川
町の下水処理の例を表６に示す。(Example 6) Table 6 shows an example of sewage treatment in Shimokawa town, Hokkaido, in the case where the amount of gypsum to be added was 3 g per 1,000 cc of raw water.
【００３１】[0031]
【表６】 [Table 6]
【００３２】（実施例７）同様に添加する石膏の量を原
水１０００ｃｃに対して５ｇとした場合の、北海道下川
町の下水処理の例を表７に示す。(Example 7) Table 7 shows an example of sewage treatment in Shimokawa-cho, Hokkaido, in the case where the amount of gypsum added was 5 g per 1,000 cc of raw water.
【００３３】[0033]
【表７】 [Table 7]
【００３４】石膏の量を増やすと、原水のＣＯＤ，全窒
素、全燐が増えても、処理水のそれらは実施例２より低
くなっている。 （実施例８）熊本県菊地郡旭志村の「本山養豚場」より
採取した豚糞の混じった豚尿の原水に対して上記実施例
１の処理と同じ処理を行ったところ、処理前の全窒素が
５３０ｍｇであったものが、処理後は１５０ｍｇに減少
した(JIS K0102 45.2 に準拠) 。すなわち、窒素分を著
しく減少させることができ、しかも、原水は黒茶色に濁
った色をしていたが、処理後は透明な濾過水を得ること
ができた。When the amount of gypsum is increased, even though the COD, total nitrogen and total phosphorus of the raw water are increased, those of the treated water are lower than those in Example 2. Example 8 The same treatment as in Example 1 was performed on the raw water of swine urine mixed with pig dung collected from “Honyama Pig Farm” in Asahi-shi Village, Kikuchi-gun, Kumamoto Prefecture. Nitrogen was 530 mg, but decreased to 150 mg after treatment (based on JIS K0102 45.2). That is, the nitrogen content could be remarkably reduced, and the raw water had a black-brown turbid color, but after the treatment, clear filtered water could be obtained.
【００３５】[0035]
【発明の効果】以上説明したように本発明は凝集前の石
膏を添加するのみの簡単な手順で、被処理液の水質を著
しく向上せることができる効果がある。As described above, according to the present invention, the water quality of the liquid to be treated can be remarkably improved by a simple procedure in which only the gypsum before aggregation is added.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０２Ｆ 11/14 Ｃ０２Ｆ 11/14 Ｅ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C02F 11/14 C02F 11/14 E
Claims (4)
た後、凝集剤を添加することを特徴とするとする汚泥の
凝集方法。1. A method for flocculating sludge, comprising adding a flocculant after adding a calcium salt to a liquid to be treated.
１に記載の汚泥の凝集方法。2. The method for coagulating sludge according to claim 1, wherein said calcium salt is gypsum.
る、請求項１に記載の汚泥の凝集方法。3. The method for coagulating sludge according to claim 1, wherein said calcium salt is calcium lactate.
臭剤を添加する、請求項１に記載の汚泥の凝集方法。4. The method for coagulating sludge according to claim 1, wherein a deodorant is added after the addition of the calcium salt and the coagulant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31641499A JP4259700B2 (en) | 1998-11-19 | 1999-11-08 | Sludge aggregation method and water treatment method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32926398 | 1998-11-19 | ||
| JP10-329263 | 1998-11-19 | ||
| JP31641499A JP4259700B2 (en) | 1998-11-19 | 1999-11-08 | Sludge aggregation method and water treatment method |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JP2000210677A true JP2000210677A (en) | 2000-08-02 |
| JP2000210677A5 JP2000210677A5 (en) | 2008-01-31 |
| JP4259700B2 JP4259700B2 (en) | 2009-04-30 |
Family
ID=26568650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31641499A Expired - Fee Related JP4259700B2 (en) | 1998-11-19 | 1999-11-08 | Sludge aggregation method and water treatment method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4259700B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002079004A (en) * | 2000-09-07 | 2002-03-19 | Yoshiro Wakimura | Aggregation method |
| JP2002079261A (en) * | 2000-09-07 | 2002-03-19 | Yoshiro Wakimura | Flocculation method |
| JP2004358392A (en) * | 2003-06-05 | 2004-12-24 | Kurita Water Ind Ltd | Sludge treatment agent and sludge treatment method |
-
1999
- 1999-11-08 JP JP31641499A patent/JP4259700B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002079004A (en) * | 2000-09-07 | 2002-03-19 | Yoshiro Wakimura | Aggregation method |
| JP2002079261A (en) * | 2000-09-07 | 2002-03-19 | Yoshiro Wakimura | Flocculation method |
| JP2004358392A (en) * | 2003-06-05 | 2004-12-24 | Kurita Water Ind Ltd | Sludge treatment agent and sludge treatment method |
| JP4707012B2 (en) * | 2003-06-05 | 2011-06-22 | 栗田工業株式会社 | Sludge malodor control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4259700B2 (en) | 2009-04-30 |
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Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20061103 |
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