JPS6365988A - Harmless treatment of ash collected in electrostatic precipitator by utilizing co2 contained in exhaust gas - Google Patents
Harmless treatment of ash collected in electrostatic precipitator by utilizing co2 contained in exhaust gasInfo
- Publication number
- JPS6365988A JPS6365988A JP61212115A JP21211586A JPS6365988A JP S6365988 A JPS6365988 A JP S6365988A JP 61212115 A JP61212115 A JP 61212115A JP 21211586 A JP21211586 A JP 21211586A JP S6365988 A JPS6365988 A JP S6365988A
- Authority
- JP
- Japan
- Prior art keywords
- ash
- slurry
- exhaust gas
- electrostatic precipitator
- contained
- 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
- 239000012717 electrostatic precipitator Substances 0.000 title claims abstract description 9
- 238000011282 treatment Methods 0.000 title description 6
- 239000002002 slurry Substances 0.000 claims abstract description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 28
- 238000007664 blowing Methods 0.000 claims description 11
- 239000002351 wastewater Substances 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000002956 ash Substances 0.000 abstract description 40
- 239000007788 liquid Substances 0.000 abstract description 16
- 239000010802 sludge Substances 0.000 abstract description 15
- 239000006228 supernatant Substances 0.000 abstract description 11
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 9
- 239000000126 substance Substances 0.000 abstract description 3
- 235000002918 Fraxinus excelsior Nutrition 0.000 abstract 3
- 239000000203 mixture Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000006641 stabilisation Effects 0.000 abstract 1
- 238000011105 stabilization Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 40
- 238000005273 aeration Methods 0.000 description 10
- 238000010828 elution Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000004056 waste incineration Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052745 lead Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010979 pH adjustment Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000011269 treatment regimen Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、排ガス中のＣ０２を利用した電気集塵器灰
（以下、ＥＰ灰と略記する）の無害化処理方法に関し、
さらに詳しくは湿式有害ガス除去プロセスを採用してい
るごみ焼却炉で生じたＥＰ灰の処理方法に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for detoxifying electrostatic precipitator ash (hereinafter abbreviated as EP ash) using CO2 in exhaust gas.
More specifically, the present invention relates to a method for treating EP ash produced in a waste incinerator that employs a wet harmful gas removal process.
従来の技術
従来、排ガス中のＣＯ２を利用したＥＰ灰等の処理技術
としては、乾式有害ガス除去プロセスを採用しているご
み焼却炉において、排ガスによる灰汚水、飛灰等の処理
プロセスとして実用化したのがある。これは、乾式有害
ガス除去プロセスで生じた未反応のＣａ（ＯＨ）２やＣ
ａＱを含むＥＰ灰を灰冷却水槽に受は入れたときに、灰
汚水の閣が上昇し、スラッジからの重金属の溶出やスケ
ーリングの問題が発生したため、排ガス中のＣＯ２を利
用して、灰汚水を中和することを企図したものである。Conventional technology Conventionally, EP ash processing technology using CO2 in exhaust gas has been put into practical use as a process for treating ash wastewater, fly ash, etc. using exhaust gas in garbage incinerators that employ a dry harmful gas removal process. There's something I did. This is caused by unreacted Ca(OH)2 and C generated in the dry harmful gas removal process.
When EP ash containing aQ was received in the ash cooling water tank, the ash sewage level rose, causing problems such as elution of heavy metals from the sludge and scaling. It is intended to neutralize the
しかし有害ガス除去プロセスとして、湿式のプロセスを
採用しているごみの焼Ｕ）炉では、生じたＥＰ灰を排ガ
スで処理する例はまだない。However, in waste incineration furnaces that employ a wet process to remove harmful gases, there is no example yet of treating the generated EP ash with exhaust gas.
この種のＥＰ灰は、未反応のＣａ（ＯＨ）２やＣａＯを
含む上記の灰とはかなり性状を異にし、つぎのような点
を空気曝気する、。This type of EP ash has properties considerably different from the above-mentioned ash containing unreacted Ca(OH)2 and CaO, and the following points are aerated with air.
１、未反応のＣａ （ＯＨ）２やＣａＯを含まない。1. Contains no unreacted Ca(OH)2 or CaO.
２、水に対する溶解率が比較的大きく、溶解スラリーは
多くの場合弱酸性を示す。2. The dissolution rate in water is relatively high, and the dissolved slurry often exhibits weak acidity.
３、有害重金属類の含有率が大きい。3. The content of harmful heavy metals is high.
本発明名らは、湿式有害ガス除去プロセスにおいて生じ
るＥＰ灰の減容化および安定化を全図し、建設コストお
よび運転コストを節減することができるとともに、運転
管理を容易ならしめることができる方法として、排ガス
中のＣＯ２を利用する方法が有効であることを見出し、
この発明を完成するに至った。The present inventors have provided a method that completely reduces and stabilizes the volume of EP ash produced in the wet harmful gas removal process, reduces construction costs and operating costs, and facilitates operational management. We discovered that a method that utilizes CO2 in exhaust gas is effective.
This invention was completed.
発明の描成
この発明による排ガス中のＣＯ２を利用したＥＰ灰の無
害化処理方法は、湿式有害ガス除去プロセスを採用して
いるごみ焼部炉で生じた電気集ｎ器灰を、排ガス中のＣ
Ｏ２で処理することを空気曝気する、。DESCRIPTION OF THE INVENTION The method of detoxifying EP ash using CO2 in exhaust gas according to the present invention converts electric concentrator ash generated in a waste incineration furnace that employs a wet harmful gas removal process into exhaust gas. C
Air aeration, treatment with O2.
この発明によるＥＰ灰の無害化を有効に行なうためには
、排ガス中のＧ Ｏ２による電気集塵器灰の処理の前に
、回状を灰汚水等のアルカリ水に溶解し、必要に応じて
アルカリ剤を添加し、得られたスラリーの閣をアルカリ
性に調整しておくとよい。In order to effectively detoxify EP ash according to this invention, before the electrostatic precipitator ash is treated with GO2 in the exhaust gas, the circular is dissolved in alkaline water such as ash wastewater, and if necessary, It is advisable to adjust the resulting slurry to be alkaline by adding an alkaline agent.
また生じたスラッジの安定化および上澄液中の重金属濃
度の低減化を行なうためには、スラリーにＣＯ２含有排
ガスを吹込んだ後、スラリーを空気曝気するとよい。Furthermore, in order to stabilize the generated sludge and reduce the concentration of heavy metals in the supernatant, it is preferable to aerate the slurry with air after blowing CO2-containing exhaust gas into the slurry.
ＥＰ灰を水またはアルカリ水に溶解した後、得られたス
ラリーにＣＯ２ガスを吹込んだり、空気曝気を行なった
りした後、スラリーを固液分離して、上澄水とスラッジ
に分離し、それぞれ充金属濃度測定および溶出テストを
行なった。After dissolving EP ash in water or alkaline water, blowing CO2 gas into the resulting slurry or performing air aeration, the slurry is solid-liquid separated into supernatant water and sludge, each of which is charged. Metal concentration measurements and elution tests were conducted.
ＥＰ灰の処理パターンは下記の６通りである。There are six treatment patterns for EP ash:
ａ）ＥＰ灰８０ｇを２／の水に溶かし、得られたスラリ
ーを３０分間撹拌する。a) Dissolve 80 g of EP ash in 2/2 water and stir the resulting slurry for 30 minutes.
ｂ） ａ）の後、スラリーにＣＯ２ガスを０．５１／
分で閣が安定するまで吹込む（液温は３５℃に保つ）。b) After a), add CO2 gas to the slurry at a rate of 0.51/
Blow in for several minutes until the liquid becomes stable (keep the liquid temperature at 35℃).
ｃ）ＥＰ灰８０ｇを２１の水に溶かし、得られたスラリ
ーにＮａ○１」を添加してスラリーのは１を１２に調整
しながら３０分間撹拌する。c) Dissolve 80 g of EP ash in 21 g of water, add Na○1 to the resulting slurry, and stir for 30 minutes while adjusting the slurry from 1 to 12.
ｄ） ｃ）＋１７）ｌ、スラリーにＣｏ２ガスを０，
５１／分でＤＨが安定するまで吹込む（液温は３５℃に
保つ）。d) c) +17)l, Co2 gas added to slurry 0,
Blow at a rate of 51/min until DH is stabilized (liquid temperature maintained at 35°C).
０）Ｃ）の後、スラリーにＣＯ２ガスを０．５１／分で
ｐＨが安定するまで吹込む（液温は３５℃に保つ）。0) After C), blow CO2 gas into the slurry at a rate of 0.51/min until the pH is stabilized (liquid temperature is maintained at 35°C).
ｆ） ｅ）の後、スラリーに空気を０．５１／分でｐ
Ｈが安定するまで吹込む。f) After e), pump air into the slurry at 0.51/min p.
Blow in until H becomes stable.
また、各処理侵のスラリーを１時間静置した後、上澄液
をＮα５Ａの濾紙で濾過し、重金属分析を行ない、残っ
たスラッジを８０〜９０℃で含水率が６０％程度になる
まで乾燥し、溶出テストを行なった。測定項目と測定方
法は以下の通りである。In addition, after allowing the slurry of each treatment to stand for 1 hour, the supernatant liquid was filtered through Nα5A filter paper, heavy metal analysis was performed, and the remaining sludge was dried at 80 to 90°C until the moisture content was approximately 60%. Then, an elution test was conducted. The measurement items and measurement methods are as follows.
・ｐＨ・・・ＪＩＳ ＫＯ１０２ガラス電極法、・ｒ
”ｂ・・・ＪＩＳ ＫＯ１０２原子吸光法、・Ｃｄ・
・・ＪＩＳ ＫＯ１０２原子吸光法、−Ｚｎ−ＪＩＳ
ＫＯ１０２原子吸光法、・■−■・・・環境庁告示
第５９号 原子吸光法、・含水率・・・
下水試験方法、・溶出テスト・・・ 環境庁告示
第１３号。・pH...JIS KO102 glass electrode method, ・r
"b...JIS KO102 atomic absorption method, Cd.
・・JIS KO102 atomic absorption method, -Zn-JIS
KO102 Atomic absorption method,・■−■・・・Environmental Agency Notification No. 59 Atomic absorption method,・Water content...
Sewage test method, elution test...Environmental Agency Notification No. 13.
測定結果を表１に示す。またＣ Ｏ２ガス吹込みによる
ｐｉｌの変化を第２図に示し、ＣＯ２ガス吹込み後の空
気曝気によるｐＨ変化を第３図に示す。The measurement results are shown in Table 1. Further, FIG. 2 shows the change in pile due to CO2 gas injection, and FIG. 3 shows the pH change due to air aeration after CO2 gas injection.
（以下余白） 表１、第１図および第２図からつぎのことがわかる。(Margin below) The following can be seen from Table 1, FIGS. 1 and 2.
（１） スラリーのｐ１１調整とＣＯ２ガス吹込みの
効果
■ｐｂ・・・スラリーがアルカリ性であるとぎは、一旦
溶出したＰｂ２＋がＣＯ２吹込みによって炭酸塩化され
、上澄液中の濃度が低減される。またスラッジの安定化
が図らける。スラリーが酸性であるときは、ｐｂは炭酸
塩化しにくい。(1) Effects of slurry p11 adjustment and CO2 gas injection■ pb...If the slurry is alkaline, once eluted Pb2+ is carbonated by CO2 injection, reducing its concentration in the supernatant liquid. . In addition, the sludge can be stabilized. When the slurry is acidic, pb is less likely to carbonate.
■Ｃｄ・・・スラリーをアルカリ性にすると、Ｃｄは水
酸化物となって安定するが、ＣＯ２ガス吹込みによって
スラリーのｐＨが低下するにつれて大間のＣｄ”＃溶出
する。しかし溶出テスト結果から、ＣＯ２ガスによって
不安定なものは抽出され、スラッジの安定化が図られて
いるものと思われる。■Cd... When the slurry is made alkaline, Cd becomes hydroxide and stabilizes, but as the pH of the slurry decreases by blowing CO2 gas, Oma's Cd''# elutes. However, from the elution test results, CO2 It seems that the gas extracts unstable substances and stabilizes the sludge.
スラリーが酸性であるときは、Ｃｄは水酸化物になりに
くい。When the slurry is acidic, Cd is less likely to become a hydroxide.
■Ｚｎ・・・スラリーをアルカリ性にするだけではＺｎ
は安定しないが、ＣＯ２ガス吹込みによる効果はＣｄと
ほぼ同様である。■Zn... Simply making the slurry alkaline is not enough to remove Zn.
Although it is not stable, the effect of CO2 gas injection is almost the same as that of Cd.
（２） 空気曝気による効果
スラリーのｐｌ（調整後、ＣＯ２ガス吹込みによってス
ラッジの安定化が図られることが判明したが、上澄液の
重金属濃度はｐｂ以外は低減されていない。そこでＣＯ
２吹込み後さらに空気曝気を行ない、過剰に溶は込んで
いるＣ Ｏ２ガスを追出しく脱炭酸化）、スラリーのｐ
Ｈを弱アルカリ性に調整すると、上澄液中のＰｂ、 Ｃ
ｄ、 Ｚｎはいずれも低減されることを確認した。同様
に、スラッジの溶出テストでも安定した結果が１！１ら
れている。なお、この操作はスケーリング防止にも役立
つ。(2) Effect of air aeration Sludge PL (After adjustment, it was found that the sludge was stabilized by blowing CO2 gas, but the heavy metal concentration in the supernatant liquid was not reduced except for PB.
2 After blowing, air aeration is performed to remove excess CO2 gas (decarbonation), and reduce the pH of the slurry.
When H is adjusted to be slightly alkaline, Pb and C in the supernatant
It was confirmed that both d and Zn were reduced. Similarly, the sludge elution test also gave stable results of 1:1. Note that this operation also helps prevent scaling.
（３）その他
第２図および第３図に示すように、本プロセスでは、Ｃ
Ｏ２ガスを過剰に吹込んでもａｌｌは６゜５以下には下
がらず、その後空気を過剰に吹込んでもｐＨは８．３を
越えることはなかった。したがってここではｐＨ調整を
行なう必要がなく、運転管理が容易になると思われる。(3) Others As shown in Figures 2 and 3, in this process, C
Even when excessive O2 gas was blown in, all did not fall below 6°5, and even after that, even when air was blown in excessively, the pH did not exceed 8.3. Therefore, there is no need to perform pH adjustment here, and operation management is thought to be easier.
また、スケーリングの発生は認められなかった。Further, no occurrence of scaling was observed.
以上のことから、Ｅ Ｐ灰の処理は第４図のような操作
で行なうことになる。なお、ＥＰ灰ススラリ−アルカリ
で単純にｐＩ＋＝８．３に調整しただけでは、上澄液の
水質は、Ｐｂ６ 、６１１９／ ／ 。Based on the above, the treatment of EP ash will be carried out as shown in Figure 4. In addition, if the EP ash slurry was simply adjusted to pI+=8.3 with alkali, the water quality of the supernatant liquid would be Pb6, 6119//.
Ｃｄ９．１ｒｙ／Ｉ、Ｚｎ１６．９ｍ９／ｌであり、ス
ラッジの溶出テスト結果は、Ｐｂ１．５′／Ｉ）９／１
１Ｃｄ４．１ｙｔｙ／（／ （含水率６３．０％）であ
った。Cd9.1ry/I, Zn16.9m9/l, and the sludge elution test results are Pb1.5'/I)9/1
1Cd4.1yty/(/ (water content 63.0%)).
この点でもＣＯ２吹込みによるＥＰ灰の処理が効を奏し
ていることがわかる。It can be seen that treatment of EP ash by CO2 injection is effective in this respect as well.
発明の効果
この発明のＥＰ灰無害化処理方法では、湿式有害ガス除
去プロセスを採用しているごみ焼却炉で生じる電気集塵
器法を、排ガス中のＣＯ２で処理するので、つぎの効果
が奏される。Effects of the Invention In the EP ash detoxification treatment method of the present invention, the electrostatic precipitator method generated in a garbage incinerator that employs a wet harmful gas removal process is treated with CO2 in the exhaust gas, so the following effects are achieved. be done.
（＋）ＥＰ灰の溶解には、灰汚水等のアルカリ性廃液を
利用することができる。(+) To dissolve EP ash, alkaline waste liquid such as ash wastewater can be used.
（２） ＣＯ２源として排ガスを利用し、スラッジの
安定化を図ることができ、スケーリングのおそれもない
。(2) Sludge can be stabilized by using exhaust gas as a CO2 source, and there is no risk of scaling.
（３） 凝集剤等を添加することなく、上澄液中の重
金属を大幅に低減することができ、廃水処理設備への負
荷が軽減される。(3) Heavy metals in the supernatant liquid can be significantly reduced without adding a coagulant or the like, reducing the load on wastewater treatment equipment.
（４） 排ガス吹込みおよび空気曝気においては、ス
ラリーのｐＨを調整する必要がなく、運転管理が容易で
ある。(4) In exhaust gas blowing and air aeration, there is no need to adjust the pH of the slurry, and operation management is easy.
こうしてこの発明の方法によれば、建設コストおよび運
転コストを節減し、かつ容易な運転管理で、ＥＰ灰の減
容化および安定化を果たすことができる。Thus, according to the method of the present invention, the volume of EP ash can be reduced and stabilized with reduced construction costs and operating costs, and easy operation management.
実 施 例 つぎにこの発明の実施例について具体的に説明する。Example Next, embodiments of the present invention will be specifically described.
第１図を参照して、ＥＰ灰溶解Ｉｆｌ！（１）に４３い
てＥＰ灰を灰汚水等に溶解してスラリーを形成し、ＥＰ
灰を減容化させる。またつきの排ガス吹込み槽（２）に
おける排ガスによるＥＰ灰の無害化の効果を有効ならし
めるために、必要に応じてＥＰ灰溶解槽（１）にアルカ
リ剤を添加し、スラリーのｐＨをアルカリ性に調整して
おく。Referring to FIG. 1, EP ash dissolution Ifl! In step (1), EP ash is dissolved in ash wastewater, etc. to form a slurry, and EP
Reduces the volume of ash. In order to make the effect of detoxifying EP ash by the exhaust gas in the exhaust gas blowing tank (2) effective, an alkaline agent is added to the EP ash dissolving tank (1) as needed to make the pH of the slurry alkaline. Adjust it.
つぎに溶解スラリーをＥＰ灰溶解層（１）から排ガス吹
込み層（２）に移し、ここでスラリーにＧ Ｏ２含有排
ガスを吹込む。これによってＥＰ灰中の重金属を炭酸塩
化したり、不安定な物質を一旦溶出させる。なお、排ガ
スを過剰に吹込んでもｐＨ値は約６．５以下には低下し
ない。The dissolved slurry is then transferred from the EP ash dissolution layer (1) to the exhaust gas blowing layer (2), where the slurry is blown with GO2-containing exhaust gas. This carbonates heavy metals in the EP ash and temporarily elutes unstable substances. Note that even if exhaust gas is blown in excessively, the pH value does not fall below about 6.5.
つぎにスラリーを排ガス吹込み槽（２）から曝気槽（３
）に移し、スラリーを空気曝気する。これによってスラ
リーに過剰に溶は込んだＣＯ２をスラリーから追出し、
ｐＨを弱アルカリ性に調整して、スラリー中のスラッジ
の安定化および上澄液中の重金属濃度の低減化を図る。Next, the slurry is transferred from the exhaust gas blowing tank (2) to the aeration tank (3).
) and aerate the slurry. By this, the excessively dissolved CO2 in the slurry is expelled from the slurry,
The pH is adjusted to be slightly alkaline to stabilize the sludge in the slurry and reduce the heavy metal concentration in the supernatant.
またこの空気曝気はスケーリングの防止にも役立つ。This air aeration also helps prevent scaling.
なお、空気を過剰に吹込んでもｐｌｌは約８．３以上に
は上らない。Note that even if air is blown in excessively, pll does not rise above about 8.3.
最後に、スラリーを曝気槽（３）から固液分館槽（４）
へ移し、ここで上澄液とスラッジに分離する。Finally, the slurry is transferred from the aeration tank (3) to the solid-liquid branch tank (4).
The liquid is then separated into supernatant liquid and sludge.
第１図はこの発明の実施例を示すフローチャート、第２
図はＣＯ２ガス吹込み時間とｐｌｌとの関係を示すグラ
フ、第３図は空気をＪ気時間とｐＨとの関係を示すグラ
フ、第４図は実験プロセスと閣との関係を示すグラフで
ある。
（１）・・・ＥＰ灰溶解槽、（２）・・・排ガス吹込み
槽、（３）・・・曝気槽、（４）・・・固液分離槽。
以上FIG. 1 is a flowchart showing an embodiment of the invention, and FIG.
Figure 3 is a graph showing the relationship between CO2 gas injection time and pll, Figure 3 is a graph showing the relationship between air flow time and pH, and Figure 4 is a graph showing the relationship between the experimental process and cabinet. . (1)...EP ash dissolution tank, (2)...exhaust gas blowing tank, (3)...aeration tank, (4)...solid-liquid separation tank. that's all
Claims (3)
却炉で生じた電気集塵器灰を、排ガス中のＣＯ＿２で処
理することを特徴とする、電気集塵器灰の無害化処理方
法。(1) A method for detoxifying electrostatic precipitator ash, which is characterized by treating electrostatic precipitator ash produced in a garbage incinerator that employs a wet harmful gas removal process with CO_2 in exhaust gas.
前に、同灰を灰汚水等のアルカリ水に溶解し、必要に応
じてアルカリ剤を添加し、得られたスラリーのｐＨをア
ルカリ性に調整しておく、特許請求の範囲第１項記載の
方法。(2) Before treating the electrostatic precipitator ash with CO_2 in the exhaust gas, dissolve the ash in alkaline water such as ash wastewater, add an alkaline agent as necessary, and adjust the pH of the resulting slurry to alkaline. The method according to claim 1, wherein the method is adjusted to:
ラリーを空気曝気する、特許請求の範囲第２項記載の方
法。(3) The method according to claim 2, wherein the slurry is aerated with air after blowing CO_2-containing exhaust gas into the slurry.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61212115A JPS6365988A (en) | 1986-09-08 | 1986-09-08 | Harmless treatment of ash collected in electrostatic precipitator by utilizing co2 contained in exhaust gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61212115A JPS6365988A (en) | 1986-09-08 | 1986-09-08 | Harmless treatment of ash collected in electrostatic precipitator by utilizing co2 contained in exhaust gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6365988A true JPS6365988A (en) | 1988-03-24 |
Family
ID=16617123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61212115A Pending JPS6365988A (en) | 1986-09-08 | 1986-09-08 | Harmless treatment of ash collected in electrostatic precipitator by utilizing co2 contained in exhaust gas |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6365988A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994012444A1 (en) * | 1992-11-23 | 1994-06-09 | Tauw Milieu B.V. | Method for the treatment of incineration residues and the use thereof as adsorption agent |
| WO1997030757A1 (en) * | 1996-02-23 | 1997-08-28 | B.C. Research, Inc. | Treatment process for contaminated waste |
| FR2762219A1 (en) * | 1997-04-17 | 1998-10-23 | Screg | Waste incineration process where the slag reacts with the residual gas |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57204296A (en) * | 1981-06-08 | 1982-12-14 | Mitsubishi Heavy Ind Ltd | Treatment of coal ash |
-
1986
- 1986-09-08 JP JP61212115A patent/JPS6365988A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57204296A (en) * | 1981-06-08 | 1982-12-14 | Mitsubishi Heavy Ind Ltd | Treatment of coal ash |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1994012444A1 (en) * | 1992-11-23 | 1994-06-09 | Tauw Milieu B.V. | Method for the treatment of incineration residues and the use thereof as adsorption agent |
| WO1997030757A1 (en) * | 1996-02-23 | 1997-08-28 | B.C. Research, Inc. | Treatment process for contaminated waste |
| FR2762219A1 (en) * | 1997-04-17 | 1998-10-23 | Screg | Waste incineration process where the slag reacts with the residual gas |
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