JP2003305329A - Method for preventing adhesion of scale and deodorizing column - Google Patents
Method for preventing adhesion of scale and deodorizing columnInfo
- Publication number
- JP2003305329A JP2003305329A JP2002116163A JP2002116163A JP2003305329A JP 2003305329 A JP2003305329 A JP 2003305329A JP 2002116163 A JP2002116163 A JP 2002116163A JP 2002116163 A JP2002116163 A JP 2002116163A JP 2003305329 A JP2003305329 A JP 2003305329A
- Authority
- JP
- Japan
- Prior art keywords
- sulfur
- filler
- compound
- tower
- cleaning solution
- 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
Landscapes
- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
- Treating Waste Gases (AREA)
- Gas Separation By Absorption (AREA)
- Detergent Compositions (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、イオウ系臭気成分
などの臭気成分を含んだ臭気ガスを対象とした脱臭塔の
スケール付着防止方法及び脱臭塔に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deodorizing tower scale adhesion preventing method and a deodorizing tower for odorous gas containing odorous components such as sulfur odorous components.
【０００２】[0002]
【従来の技術】脱臭塔として、たとえば図１に示すよう
な循環式散水方式のものがある。この脱臭塔は、臭気ガ
ス流入口８と脱臭ガス流出口９とを形成した脱臭塔２内
の上部に、脱臭効率を高めるための充填材層３と、充填
材層３に向けて洗浄液４を散水する散水装置５とを備
え、下部に貯水部６を備えており、脱臭塔２の外部に、
貯水部６内の洗浄液４を散水装置５に循環供給する循環
ポンプ７を備えている。2. Description of the Related Art As a deodorizing tower, there is, for example, a circulating sprinkler system as shown in FIG. In this deodorization tower, a filler layer 3 for improving deodorization efficiency and a cleaning liquid 4 toward the filler layer 3 are provided in an upper part of the deodorization tower 2 in which an odorous gas inlet 8 and a deodorant gas outlet 9 are formed. A sprinkler 5 for sprinkling water is provided, and a water storage unit 6 is provided at the lower part.
A circulation pump 7 that circulates the cleaning liquid 4 in the water storage unit 6 to the water sprinkling device 5 is provided.
【０００３】このような脱臭塔において、屎尿処理場で
発生した硫化水素等のイオウ系臭気成分を含んだ臭気ガ
スを脱臭処理する場合には、臭気ガスを塔内に導入して
充填材層３を通過させ、散水装置５によって噴霧された
次亜塩素酸ナトリウムを含む循環する洗浄水４と接触す
ることによって臭気ガス中に含まれるイオウ系臭気成分
を分解している。In such a deodorizing tower, when deodorizing an odorous gas containing a sulfur-based odorous component such as hydrogen sulfide generated in a human waste treatment plant, the odorous gas is introduced into the tower to fill the filler layer 3 Of the sulfur-based odorous component contained in the odorous gas by contact with the circulating cleaning water 4 containing sodium hypochlorite sprayed by the water sprinkling device 5.
【０００４】散水を行うに際しては、図示したように、
貯水部６内の循環用の洗浄液４に水酸化ナトリウムなど
のアルカリ剤（苛性ソーダ溶液１１）を併せて添加し、
散水する洗浄液をアルカリ性に維持するとともに、貯水
部６に補給水を供給して、塩濃度を一定値よりも低く維
持し、臭気成分の分解によって発生するイオウや硫黄化
合物のスケール付着を防止するようにしている。また、
カルシウムスケールの付着を防止するため、ポリアクリ
ル酸やポリマレイン酸を洗浄液に添加することもでき
る。連続操作のためには蒸発などにより液量が減少した
ときには補給水１３を供給し、また過剰なときには排水
１４として出す。もしスケールが多量に付着すれば、圧
力損失の増加を招き、やがては運転不能に陥ることとな
る。When performing watering, as shown in the figure,
An alkaline agent (caustic soda solution 11) such as sodium hydroxide is also added to the circulating cleaning liquid 4 in the water storage unit 6,
While keeping the sprinkling cleaning solution alkaline and supplying make-up water to the water reservoir 6 to keep the salt concentration below a certain value, to prevent the scale adhesion of sulfur and sulfur compounds generated by decomposition of odorous components. I have to. Also,
In order to prevent the adhesion of calcium scale, polyacrylic acid or polymaleic acid can be added to the cleaning liquid. For continuous operation, makeup water 13 is supplied when the amount of liquid decreases due to evaporation or the like, and drainage 14 is supplied when the amount is excessive. If a large amount of scale adheres, it will cause an increase in pressure loss and eventually lead to an inoperability.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、このよ
うな設備では循環水のｐＨが高いため、スケール防止剤
として一般に用いられるポリアクリル酸やポリマレイン
酸を添加しても十分な効果が得られず、定期的な洗浄作
業が必要であった。加えて、これらのスケール防止剤
は、次亜塩素酸によって酸化分解を受けたり、イオウ等
によって吸着されることがあり、短期的な効果を得る場
合でも３００ｍｇ／リットルをこえる高い添加量が必要
であった。これを改善する目的で、ビス（ポリ−２−カ
ルボキシエチル）ホスフィン酸等の適用も提案されてい
るが、長期にわたって安定した効果を得るためには、依
然高い添加量が必要であった。However, in such equipment, since the pH of the circulating water is high, addition of polyacrylic acid or polymaleic acid, which is generally used as a scale inhibitor, does not provide a sufficient effect. Regular cleaning work was required. In addition, these scale inhibitors may be oxidatively decomposed by hypochlorous acid or adsorbed by sulfur and the like, and even if a short-term effect is obtained, a high addition amount exceeding 300 mg / liter is required. there were. For the purpose of improving this, application of bis (poly-2-carboxyethyl) phosphinic acid or the like has been proposed, but a high addition amount was still required to obtain a stable effect for a long period of time.
【０００６】本発明は上記問題を解決するもので、循環
式散水方式若しくは一過式散水方式の脱臭塔において、
次亜塩素酸ナトリウムを用いる場合に問題となる、イオ
ウ、硫黄化合物およびカルシウム化合物の充填材への付
着を防止する方法を提供することを目的とするものであ
る。The present invention solves the above-mentioned problems, and in a deodorization tower of a circulation type sprinkler system or a transient type sprinkler system,
It is an object of the present invention to provide a method for preventing sulfur, sulfur compounds and calcium compounds from adhering to a filler, which is a problem when using sodium hypochlorite.
【０００７】[0007]
【課題を解決するための手段】本発明は、以下の手段に
より前記課題を解決した。
（１）次亜塩素酸ナトリウムを含有する洗浄液を用いる
散水方式の脱臭塔において、洗浄液に下記化学式（１）
で示される化合物を散水中に添加することにより、イオ
ウ、硫黄化合物及びカルシウム化合物が充填材に付着す
ることを防止することを特徴とするスケール付着防止方
法。The present invention has solved the above-mentioned problems by the following means. (1) In a water sprinkling type deodorizing tower using a cleaning solution containing sodium hypochlorite, the cleaning solution has the following chemical formula (1)
A method for preventing scale adhesion, which comprises preventing the sulfur, the sulfur compound and the calcium compound from adhering to the filler by adding the compound shown in (4) into the water.
【０００８】[0008]
【化３】 [Chemical 3]
【０００９】式中、Ｘ＝ＯＨ又は繰り返し重合単位、
Ｙ＝Ｈ，ＳＯ4又はＨＰＯ−Ｎａ、
Ｚ＝ＣＯＮＨＣ（ＣＨ3）2ＣＨ2ＳＯ3Ｎａ又はＫ、
ｎ＋ｍ＝５〜５０
（２）ポリアクリル酸及びその共重合物、並びにポリマ
レイン酸及びその共重合物のうちの少なくとも１つを１
ｍｇ／リットル以上を併せて洗浄液に添加することを特
徴とする前記（１）記載のスケール付着防止方法。In the formula, X = OH or repeating polymerized units, Y = H, SO 4 or HPO-Na, Z = CONHC (CH 3 ) 2 CH 2 SO 3 Na or K, n + m = 5 to 50 (2) Poly At least one of acrylic acid and its copolymer, and polymaleic acid and its copolymer
The method for preventing scale adhesion according to (1) above, wherein mg / liter or more is also added together to the cleaning liquid.
【００１０】（３）次亜塩素酸ナトリウムを含有する洗
浄液を用いる散水方式の脱臭塔において、塔内に充填材
が充填され、充填材層の上方に下記化学式（１）で示さ
れる化合物を散水中に添加した洗浄液を散布する散水装
置を設置した、イオウ、硫黄化合物及びカルシウム化合
物が充填材に付着することを防止することを特徴とする
脱臭塔。(3) In a water sprinkling type deodorizing tower using a cleaning solution containing sodium hypochlorite, a packing material is filled in the tower, and a compound represented by the following chemical formula (1) is sprinkled above the packing material layer. A deodorization tower equipped with a sprinkler for spraying the cleaning liquid added therein, which prevents sulfur, sulfur compounds and calcium compounds from adhering to the filler.
【００１１】[0011]
【化４】 [Chemical 4]
【００１２】式中、Ｘ＝ＯＨ又は繰り返し重合単位、 Ｙ＝Ｈ，ＳＯ4又はＨＰＯ−Ｎａ、 Ｚ＝ＣＯＮＨＣ（ＣＨ3）2ＣＨ2ＳＯ3Ｎａ又はＫ、 ｎ＋ｍ＝５〜５０In the formula, X = OH or repeating polymer units, Y = H, SO 4 or HPO-Na, Z = CONHC (CH 3 ) 2 CH 2 SO 3 Na or K, n + m = 5 to 50
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施の形態を説明
するが、本発明はこれに限定されない。本発明は、循環
式散水方式若しくは一過式散水方式の脱臭塔において、
次亜塩素酸ナトリウムを用いる場合に問題となる、イオ
ウ、硫黄化合物およびカルシウム化合物の充填材への付
着を防止する方法に関する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described, but the present invention is not limited thereto. The present invention, in a deodorizing tower of a circulation type watering system or a transient type watering system,
The present invention relates to a method for preventing the adhesion of sulfur, sulfur compounds and calcium compounds to a filler, which is a problem when using sodium hypochlorite.
【００１４】本発明におけるスケール付着防止方法で
は、化学式（１）で示される化合物を散水中に１〜３０
０ｍｇ／リットルとなるように添加する。それにより、
イオウ、硫黄化合物及びカルシウム化合物が充填材に付
着することを効果的に防止することができる。また、ポ
リアクリル酸及びその共重合物、ポリマレイン酸及びそ
の共重合物のうちの少なくとも一つを１ｍｇ／リットル
以上を化学式（１）で示される化合物と洗浄液に併せて
添加することが好ましい。In the method for preventing scale adhesion in the present invention, the compound represented by the chemical formula (1) is sprinkled in water in an amount of 1 to 30.
Add so that it becomes 0 mg / liter. Thereby,
It is possible to effectively prevent sulfur, sulfur compounds and calcium compounds from adhering to the filler. Further, it is preferable to add at least 1 mg / liter of polyacrylic acid and its copolymer, polymaleic acid and its copolymer together with the compound represented by the chemical formula (1) and the cleaning solution.
【００１５】化学式（１）で示される化合物の具体例と
しては、化学式（２）で示されるホスホノカルボン酸を
挙げることができる。Specific examples of the compound represented by the chemical formula (1) include phosphonocarboxylic acid represented by the chemical formula (2).
【００１６】[0016]
【化５】 [Chemical 5]
【００１７】式中、Ｙ＝Ｈ、 Ｚ＝ＣＯＮＨＣ（ＣＨ3）2ＣＨ2ＳＯ3Ｎａ、 ｎ＋ｍ＝１０〜２５の混合物Where Y = H, Z = CONHC (CH 3 ) 2 CH 2 SO 3 Na, n + m = 10-25 mixture
【００１８】この添加量が１ｍｇ／リットル未満の場合
にはスケール付着防止効果が不十分となり、３００ｍｇ
／リットルを超えると発泡が激しくなったり、自身の分
解生成物がスケールの原因となるので好ましくない。最
も好ましいのは、１０〜２００ｍｇ／リットルの範囲で
ある。ポリアクリル酸及びその共重合物、又はポリマレ
イン酸及びその共重合物のうちの少なくとも一つを１ｍ
ｇ／リットル以上を化学式（１）で示される化合物と併
せて添加することは、スケール付着防止効果を高めるた
めに好ましい。しかし、１ｍｇ／リットル以下では十分
な効果は得られたいため、通常５〜１５０ｍｇ／リット
ルの範囲で添加することが最も好ましい。If the amount added is less than 1 mg / liter, the effect of preventing scale adhesion will be insufficient, resulting in 300 mg.
If it exceeds / liter, foaming becomes severe, and the decomposition product of itself causes scale, which is not preferable. Most preferred is the range of 10-200 mg / liter. 1 m of at least one of polyacrylic acid and its copolymer, or polymaleic acid and its copolymer
It is preferable to add g / liter or more together with the compound represented by the chemical formula (1) in order to enhance the scale adhesion preventing effect. However, since it is not desired to obtain a sufficient effect at 1 mg / liter or less, it is usually most preferable to add it in the range of 5 to 150 mg / liter.
【００１９】[0019]
【実施例】以下に本発明の実施例を示す。ただし、本発
明はこれらの実施例により何等制限されるものでない。EXAMPLES Examples of the present invention will be shown below. However, the present invention is not limited to these examples.
【００２０】実施例１
硫化水素等のイオウ系臭気成分を高濃度（Ｈ2Ｓ ５０
ｐｐｍ）に含んだ臭気ガスを脱臭塔内に導入して充填材
として円筒形テラレット（大きさ２０ｍｍ）を高さ５ｍ
充填した充填材層を通過させ、散水装置によって噴霧さ
れた次亜塩素酸ナトリウム１０００ｍｇ／リットルを含
む洗浄液と接触することによって臭気成分を分解してい
る脱臭塔の循環する洗浄液に、化学式（２）で示される
ホスホノカルボン酸を０．１〜５００ｍｇ／リットル添
加し、充填材付着物の経時変化を観察した。結果は第１
表に示すとおりである。９０日後の付着量が１０（ｍｇ
／ｃｍ2）以下であれば良好、１８０日後の付着量が１
０（ｍｇ／ｃｍ2）以下で極めて良好と判断される。な
お、付着量は、充填材の表面積当たりの量で求めた。Example 1 Sulfur-based odorous components such as hydrogen sulfide were highly concentrated (H 2 S 50
The odorous gas contained in (ppm) is introduced into the deodorization tower, and a cylindrical terraret (size 20 mm) is used as a filler at a height of 5 m.
The cleaning liquid circulating in the deodorizing tower, which decomposes odorous components by passing through the filled packing material layer and contacting with the cleaning liquid containing 1000 mg / liter of sodium hypochlorite sprayed by the water sprinkler, is represented by the chemical formula (2). 0.1 to 500 mg / liter of the phosphonocarboxylic acid represented by was added and the change with time of the adhered material of the filler was observed. The result is first
As shown in the table. Adhesion amount after 90 days is 10 (mg
/ Cm 2 ) or less is good, and the adhesion amount after 180 days is 1
It is judged to be extremely good at 0 (mg / cm 2 ) or less. The amount of adhesion was determined by the amount per surface area of the filler.
【００２１】[0021]
【表１】 [Table 1]
【００２２】第１表に示すとおり、化学式（２）で示さ
れる化合物を洗浄液中に１〜３００ｍｇ／リットル添加
することにより、１８０日後でもスケール付着を効果的
に防止することができる。As shown in Table 1, by adding 1 to 300 mg / liter of the compound represented by the chemical formula (2) to the cleaning liquid, scale adhesion can be effectively prevented even after 180 days.
【００２３】実施例２
実施例１と同条件の脱臭塔において、次亜塩素酸ナトリ
ウムを実施例１と同量含有する循環洗浄液に、化学式
（２）で示されるホスホノカルボン酸を１０及び２００
ｍｇ／リットルと、とポリアクリル酸０．５〜２００ｍ
ｇ／リットルを添加し、充填材付着物の経時変化を観察
した。結果は第２表に示すとおりである。Example 2 In a deodorizing tower under the same conditions as in Example 1, 10 and 200 of the phosphonocarboxylic acid represented by the chemical formula (2) was added to the circulating cleaning solution containing the same amount of sodium hypochlorite as in Example 1.
mg / liter, and polyacrylic acid 0.5-200 m
g / l was added, and the change with time of the deposits on the filler was observed. The results are shown in Table 2.
【００２４】第２表に示すとおり、化学式（２）で示さ
れる化合物の添加とともに、ポリアクリル酸及びその化
合物、若しくはポリマレイン酸及びその共重合物を１ｍ
ｇ／リットル以上散水中に併せて添加することにより、
スケール付着を顕著に防止することができる。As shown in Table 2, with addition of the compound represented by the chemical formula (2), polyacrylic acid and its compound, or polymaleic acid and its copolymer were added to 1 m.
By adding more than g / l in sprinkling water,
It is possible to remarkably prevent scale adhesion.
【００２５】[0025]
【表２】 [Table 2]
【００２６】[0026]
【発明の効果】本発明によれば、化学式（１）で示され
る化合物を洗浄液中に１〜３００ｍｇ／リットルとなる
ように添加することで、イオウ、硫黄化合物およびカル
シウム化合物が充填材に付着することを防止し、充填材
層の圧損上昇を防止して、安定した脱臭運転を達成でき
る。According to the present invention, the compound represented by the chemical formula (1) is added to the cleaning solution at a concentration of 1 to 300 mg / liter, whereby the sulfur, the sulfur compound and the calcium compound adhere to the filler. It is possible to prevent this from happening and to prevent the pressure loss of the filler layer from rising, so that stable deodorizing operation can be achieved.
【図１】循環式散水方式の脱臭塔を説明する概略説明図
である。FIG. 1 is a schematic explanatory diagram illustrating a deodorizing tower of a circulation type sprinkler system.
１ 臭気ガス ２ 脱臭塔 ３ 充填材層 ４ 洗浄液 ５ 散水装置 ６ 貯水部 ７ 循環ポンプ ８ 臭気ガス流入口 ９ 脱臭ガス流出口 １０ 脱臭ガス １１ 苛性ソーダ溶液 １２ 次亜塩素酸ソーダ溶液 １３ 補給水 １４ 排水 1 Odor gas 2 deodorization tower 3 Filler layer 4 cleaning liquid 5 Sprinkler 6 water storage 7 Circulation pump 8 Odor gas inlet 9 Deodorizing gas outlet 10 Deodorizing gas 11 caustic soda solution 12 Sodium hypochlorite solution 13 Make-up water 14 drainage
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 5/14 Ｃ０２Ｆ 5/14 Ｃ Ｃ０８Ｆ 220/06 Ｃ０８Ｆ 220/06 220/58 220/58 Ｃ１１Ｄ 7/26 Ｃ１１Ｄ 7/26 7/36 7/36 7/54 7/54 // Ｂ０１Ｄ 53/38 Ｂ０１Ｄ 53/34 １１６Ｃ 53/77 Ｆターム(参考） 4C080 AA07 BB02 CC03 CC04 CC13 HH03 KK06 LL03 MM01 NN26 QQ01 4D002 AB02 AC10 BA02 CA01 CA07 DA02 DA18 DA37 DA70 HA05 4D020 AA09 BA01 BA07 BB03 CB08 CB25 CC18 4H003 DA09 DA12 EB23 EB30 EB32 EE08 FA07 FA27 4J100 AJ02P AM21Q BA56Q CA04 CA27 JA15 Front page continuation (51) Int.Cl. 7 identification code FI theme code (reference) C02F 5/14 C02F 5/14 C C08F 220/06 C08F 220/06 220/58 220/58 C11D 7/26 C11D 7 / 26 7/36 7/36 7/54 7/54 // B01D 53/38 B01D 53/34 116C 53/77 F term (reference) 4C080 AA07 BB02 CC03 CC04 CC13 HH03 KK06 LL03 MM01 NN26 QQ01 4D002 AB02 AC10 BA02 CA01 CA07 DA02 DA18 DA37 DA70 HA05 4D020 AA09 BA01 BA07 BB03 CB08 CB25 CC18 4H003 DA09 DA12 EB23 EB30 EB32 EE08 FA07 FA27 4J100 AJ02P AM21Q BA56Q CA04 CA27 JA15
Claims (3)
を用いる散水方式の脱臭塔において、洗浄液に下記化学
式（１）で示される化合物を散水中に添加することによ
り、イオウ、硫黄化合物及びカルシウム化合物が充填材
に付着することを防止することを特徴とするスケール付
着防止方法。 【化１】 式中、Ｘ＝ＯＨ又は繰り返し重合単位、 Ｙ＝Ｈ，ＳＯ4又はＨＰＯ−Ｎａ、 Ｚ＝ＣＯＮＨＣ（ＣＨ3）2ＣＨ2ＳＯ3Ｎａ又はＫ、 ｎ＋ｍ＝５〜５０1. In a water sprinkling type deodorizing tower using a cleaning solution containing sodium hypochlorite, a compound represented by the following chemical formula (1) is added to the cleaning solution to add sulfur, a sulfur compound and a calcium compound. A method for preventing scale from adhering, characterized in that it is prevented from adhering to the filler. [Chemical 1] Wherein, X = OH or repeating polymerized units, Y = H, SO 4 or HPO-Na, Z = CONHC ( CH 3) 2 CH 2 SO 3 Na or K, n + m = 5~50
にポリマレイン酸及びその共重合物のうちの少なくとも
１つを１ｍｇ／リットル以上を併せて洗浄液に添加する
ことを特徴とする請求項１記載のスケール付着防止方
法。2. The cleaning solution according to claim 1, wherein at least one of polyacrylic acid and a copolymer thereof, and polymaleic acid and a copolymer thereof is added in an amount of 1 mg / liter or more. Scale adhesion prevention method.
を用いる散水方式の脱臭塔において、塔内に充填材が充
填され、充填材層の上方に下記化学式（１）で示される
化合物を散水中に添加した洗浄液を散布する散水装置を
設置した、イオウ、硫黄化合物及びカルシウム化合物が
充填材に付着することを防止することを特徴とする脱臭
塔。 【化２】 式中、Ｘ＝ＯＨ又は繰り返し重合単位、 Ｙ＝Ｈ，ＳＯ4又はＨＰＯ−Ｎａ、 Ｚ＝ＣＯＮＨＣ（ＣＨ3）2ＣＨ2ＳＯ3Ｎａ又はＫ、 ｎ＋ｍ＝５〜５０3. A sprinkler-type deodorization tower using a cleaning solution containing sodium hypochlorite, wherein the tower is filled with a packing material, and a compound represented by the following chemical formula (1) is sprinkled over the packing material layer. A deodorization tower equipped with a water sprinkler for spraying the cleaning liquid added to the column, which prevents sulfur, sulfur compounds and calcium compounds from adhering to the filler. [Chemical 2] Wherein, X = OH or repeating polymerized units, Y = H, SO 4 or HPO-Na, Z = CONHC ( CH 3) 2 CH 2 SO 3 Na or K, n + m = 5~50
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