JPS6068094A - Treatment of waste water from wet gas washing apparatus - Google Patents
Treatment of waste water from wet gas washing apparatusInfo
- Publication number
- JPS6068094A JPS6068094A JP17560083A JP17560083A JPS6068094A JP S6068094 A JPS6068094 A JP S6068094A JP 17560083 A JP17560083 A JP 17560083A JP 17560083 A JP17560083 A JP 17560083A JP S6068094 A JPS6068094 A JP S6068094A
- Authority
- JP
- Japan
- Prior art keywords
- waste water
- wet gas
- heavy metal
- washing apparatus
- liquid separation
- 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.)
- Pending
Links
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、都市ごみ焼却炉からの排ガスを湿式洗浄した
際に排出される湿式ガス洗浄排水中の水銀およびフッ素
を除去する方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for removing mercury and fluorine from wet gas cleaning wastewater discharged when exhaust gas from a municipal waste incinerator is wet cleaned.
従来、湿式ガス洗浄排水中の水銀を除去する方法として
、硫化ソーダと塩化第2鉄を添加する凝集沈殿法が用い
られていた。すなわち第1図に示すように、原水(排水
)を第1急速攪拌凝集槽1に導入し、硫化ソーダ、塩化
第2鉄を添加してpH調整剤にてpHを調整しながら急
速攪拌し、ついで第1緩速攪拌凝集イ■2に導入し、高
分子助剤を添加して緩速攪拌した後、第1沈殿槽6に送
って固液分離し水銀を除去していた。フッ素を除去する
ためには上澄をさらに第2急速攪拌凝集槽4に導入し、
Al塩またはCa塩を添加してpH調整剤にてpHを調
整しながら急速攪拌し、ついで第2緩速攪拌凝集槽5に
導入し、高分子助剤を添加して緩速攪拌した後、第2沈
殿槽6に送って、汚泥と処理水に分離していた。このよ
うに水銀とフッ素を除去するためには2回の固液分離を
必要とする上に、水銀の除去性能に関してもつぎのよう
な問題があった。Conventionally, as a method for removing mercury from wet gas cleaning wastewater, a coagulation-precipitation method in which sodium sulfide and ferric chloride are added has been used. That is, as shown in FIG. 1, raw water (wastewater) is introduced into the first rapid stirring coagulation tank 1, and is rapidly stirred while adding sodium sulfide and ferric chloride and adjusting the pH with a pH adjuster. The mixture was then introduced into the first slow stirring aggregation step (2), a polymer auxiliary agent was added thereto, the mixture was slowly stirred, and then sent to the first settling tank 6 for solid-liquid separation to remove mercury. In order to remove fluorine, the supernatant is further introduced into a second rapid stirring flocculation tank 4,
After adding Al salt or Ca salt and stirring rapidly while adjusting the pH with a pH adjuster, the mixture was then introduced into the second slow stirring aggregation tank 5, and after adding a polymer auxiliary agent and stirring slowly, The sludge was sent to the second settling tank 6 and separated into sludge and treated water. In order to remove mercury and fluorine in this way, solid-liquid separation is required twice, and there are also the following problems regarding the mercury removal performance.
(1)硫化ソーダと反応した水銀は硫化水銀となって固
液分離されるが、硫化水銀は微細なために固液分離操作
が難しく、後段へ水銀がリークし、性能が安定しない。(1) Mercury that reacts with sodium sulfide becomes mercury sulfide and is separated into solid-liquid, but mercury sulfide is so fine that solid-liquid separation is difficult, and mercury leaks to the subsequent stage, resulting in unstable performance.
(2)硫化水素発生のおそれがあり、換気装置強化の必
要がある。(2) There is a risk of hydrogen sulfide generation, and ventilation equipment needs to be strengthened.
(3)除去された水銀は汚泥として搬出されるが、この
汚泥から水銀が溶出する。(3) The removed mercury is carried out as sludge, and mercury is eluted from this sludge.
(4)水銀の排出規制値0.005fnV′β を達成
することは困鑓で、後段に活性炭、イオン交換樹脂、キ
レート樹脂などの処理装置が必要であった。(4) It was difficult to achieve the mercury emission regulation value of 0.005fnV'β, and processing equipment such as activated carbon, ion exchange resin, and chelate resin was required at the subsequent stage.
このように複数の固液分離操作が必要で、運転管理も難
しく、設備費および設置面積も大でコスト高であった。As described above, multiple solid-liquid separation operations are required, operation management is difficult, and equipment costs and installation area are large, resulting in high costs.
本発明は上記の諸点に鑑みなされたもので、都市ごみ焼
却炉の湿式ガス洗浄排水に、重金属固定剤および硫酸バ
ンドなどのアルミニウム化合物を添加し攪拌混合すると
ともに、pH調整剤を添加してpHを中性付近に調整し
、ついで高分子助剤を添加し攪拌混合した後、固液分離
を行うことにより、一度の固液分離で水銀とフッ素を同
時に除去することができ、しかも運転が容易で、設備費
、設置面積も小さく経済的な湿式ガス洗浄排水の処理方
法を提供せんとするものである。The present invention was made in view of the above points, and includes adding a heavy metal fixative and an aluminum compound such as sulfuric acid to wet gas cleaning wastewater from a municipal waste incinerator, stirring and mixing the same, and adding a pH adjuster to adjust the pH. By adjusting the liquid to around neutrality, then adding a polymeric auxiliary agent, stirring and mixing, and then performing solid-liquid separation, mercury and fluorine can be removed at the same time with one solid-liquid separation, and it is easy to operate. The present invention aims to provide an economical method for treating wet gas cleaning wastewater with small equipment costs and small installation area.
以下、本発明の構成を図面に基づいて説明する。Hereinafter, the configuration of the present invention will be explained based on the drawings.
第2図は本発明の方法を実施する装置の一例を示してい
る。湿式ガス洗浄排水(原水)を急速攪拌凝集槽7に導
入、苛性ソーダ、重金属固定剤、アルミニウム化合物を
添加し攪拌混合する。pHは6〜8、望ましくは6.5
〜7.5になるように調整する。重金属固定剤としては
、イオウ分を含むキレート基を有する液体キレート樹脂
を使用する。FIG. 2 shows an example of an apparatus for carrying out the method of the invention. Wet gas cleaning wastewater (raw water) is introduced into a rapid stirring coagulation tank 7, and caustic soda, a heavy metal fixative, and an aluminum compound are added and mixed with stirring. pH is 6-8, preferably 6.5
Adjust so that it becomes ~7.5. As the heavy metal fixing agent, a liquid chelate resin having a chelate group containing sulfur is used.
ついでこの排水を緩速攪拌凝集槽8に流入させ、高分子
助剤を添加して緩速攪拌した後、沈殿槽9に送って汚泥
と処理水に分離する。Next, this wastewater flows into a slow agitation flocculating tank 8, where a polymeric auxiliary agent is added and slowly stirred, and then sent to a settling tank 9 where it is separated into sludge and treated water.
本発明の方法によれば、一度の固液分離で水銀、フッ素
の放流規制値0.005 mf/I!、、15’q/j
2 ヲ(−れぞれ満足することができ、また硫化水素発
生のおそれはなく安全であり、汚泥からの水銀の溶出が
ないなとの効果を奏する。According to the method of the present invention, the discharge regulation value of mercury and fluorine is 0.005 mf/I in one solid-liquid separation! ,,15'q/j
2 (-) It is possible to satisfy each of these requirements, and it is safe with no risk of hydrogen sulfide generation, and has the effect that mercury does not elute from the sludge.
つぎに本発明の実施例について説明する。Next, embodiments of the present invention will be described.
実施例
下記の水質の都市ごみ焼却炉の湿式ガス洗浄排水を使用
し、第2図に示すフローにしたがって実験した。EXAMPLE An experiment was conducted according to the flow shown in FIG. 2 using wet gas cleaning wastewater from a municipal waste incinerator having the following water quality.
フッ素 20〜507nf/Il−平均26.5fn9
/ft水銀 1〜2Vβ 平均 1.4巧/2溶解塩分
22%
鉄 2.8〜130fng/fi 平均46.8q/4
2鉛 0.01〜0.46 Ml/It 平均 0.2
3q/nこの排水を急速攪拌凝集槽にて重金属固定剤(
液体キレート剤)と硫酸バンドを添加し、同時に苛性ソ
ーダにてpHを7に調整した。重金属固定剤の添加率は
10ppm、硫酸バンドの添加率は500pl)m 、
1000 ppm 、 2000 ppmの3種とし
た。急速攪拌時間は約10分間、攪拌機の回転数は35
0rpmであった。さらに緩速攪拌凝集槽にて高分子助
剤を3 ppm添加し、攪拌機の回転数36 rpmで
10分間攪拌を行った。ついで沈殿槽にて固液分離を行
い、上澄水の水質分析を行った。結果は下表の如くであ
った。Fluorine 20-507nf/Il - average 26.5fn9
/ft Mercury 1-2Vβ Average 1.4 q/2 Dissolved salt 22% Iron 2.8-130 fng/fi Average 46.8q/4
2 Lead 0.01-0.46 Ml/It average 0.2
3q/n This wastewater is treated with a heavy metal fixative (
A liquid chelating agent) and sulfuric acid were added, and at the same time the pH was adjusted to 7 with caustic soda. The addition rate of heavy metal fixative is 10 ppm, the addition rate of sulfuric acid band is 500 pl)m,
There were three types: 1000 ppm and 2000 ppm. The rapid stirring time is approximately 10 minutes, and the rotation speed of the stirrer is 35.
It was 0 rpm. Further, 3 ppm of a polymer auxiliary agent was added in a slow stirring coagulation tank, and stirring was performed for 10 minutes at a stirrer rotation speed of 36 rpm. Solid-liquid separation was then performed in a settling tank, and the quality of the supernatant water was analyzed. The results were as shown in the table below.
(以下余白)
破
ト
G・
−
表から、本発明の方法によれば単一の固液分離のみで、
フッ素と水銀を排出規準以下にまで除去することが可能
であることがわかる。また鉄、鉛などの重金属を除去す
ることも可能である。(Left below) Breaking G・- From the table, it can be seen that according to the method of the present invention, only a single solid-liquid separation is required.
It can be seen that it is possible to remove fluorine and mercury to levels below the emission standards. It is also possible to remove heavy metals such as iron and lead.
第1図は従来の湿式ガス洗浄排水処理装置の70−シー
ト、第2図は本発明の方法を実施する湿式ガス洗浄排水
処理装置の一例を示すフローシートである。FIG. 1 is a 70-sheet of a conventional wet gas cleaning wastewater treatment apparatus, and FIG. 2 is a flow sheet showing an example of a wet gas cleaning wastewater treatment apparatus implementing the method of the present invention.
Claims (1)
剤および硫酸バンドなどのアルミニウム化合物を添加し
攪拌混合するとともに、pH調整剤を添加してpHを中
性付近に調整し、ついで高分子助剤を添加し攪拌混合し
た後、固液分離を行って排水中の水銀とフッ素を除去す
ることを特徴とする湿式ガス洗浄排水の処理方法。1 Add heavy metal fixatives and aluminum compounds such as sulfuric acid to wet gas cleaning wastewater from municipal waste incinerators, stir and mix, add a pH adjuster to adjust the pH to around neutrality, and then add polymer additives. A method for treating wet gas cleaning wastewater, which is characterized by adding a chemical agent and stirring and mixing, and then performing solid-liquid separation to remove mercury and fluorine from the wastewater.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17560083A JPS6068094A (en) | 1983-09-21 | 1983-09-21 | Treatment of waste water from wet gas washing apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17560083A JPS6068094A (en) | 1983-09-21 | 1983-09-21 | Treatment of waste water from wet gas washing apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6068094A true JPS6068094A (en) | 1985-04-18 |
Family
ID=15998920
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17560083A Pending JPS6068094A (en) | 1983-09-21 | 1983-09-21 | Treatment of waste water from wet gas washing apparatus |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6068094A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01176493A (en) * | 1987-12-28 | 1989-07-12 | Osaka City | Treatment of waste water from incineration plant |
EP1166851A1 (en) * | 2000-06-30 | 2002-01-02 | Nippon Shokubai Co., Ltd. | Method of removing heavy metals from waste gases |
JP2014091115A (en) * | 2012-11-07 | 2014-05-19 | Swing Corp | Method and device of treating heavy metal-containing waste fluid |
CN106219806A (en) * | 2016-08-17 | 2016-12-14 | 广东先导稀材股份有限公司 | A kind of processing method of heavy metal wastewater thereby |
CN106348415A (en) * | 2016-10-09 | 2017-01-25 | 东莞市台腾环保材料科技有限公司 | QCL-T complexing breaking agent and preparation method thereof |
-
1983
- 1983-09-21 JP JP17560083A patent/JPS6068094A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01176493A (en) * | 1987-12-28 | 1989-07-12 | Osaka City | Treatment of waste water from incineration plant |
JPH0445237B2 (en) * | 1987-12-28 | 1992-07-24 | Osaka City | |
EP1166851A1 (en) * | 2000-06-30 | 2002-01-02 | Nippon Shokubai Co., Ltd. | Method of removing heavy metals from waste gases |
US6638432B2 (en) | 2000-06-30 | 2003-10-28 | Nippon Shokubai Co., Ltd. | Method of treating waste liquid |
JP2014091115A (en) * | 2012-11-07 | 2014-05-19 | Swing Corp | Method and device of treating heavy metal-containing waste fluid |
CN106219806A (en) * | 2016-08-17 | 2016-12-14 | 广东先导稀材股份有限公司 | A kind of processing method of heavy metal wastewater thereby |
CN106348415A (en) * | 2016-10-09 | 2017-01-25 | 东莞市台腾环保材料科技有限公司 | QCL-T complexing breaking agent and preparation method thereof |
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