JPH01104400A - Treatment of sludge containing heavy metal - Google Patents
Treatment of sludge containing heavy metalInfo
- Publication number
- JPH01104400A JPH01104400A JP25878587A JP25878587A JPH01104400A JP H01104400 A JPH01104400 A JP H01104400A JP 25878587 A JP25878587 A JP 25878587A JP 25878587 A JP25878587 A JP 25878587A JP H01104400 A JPH01104400 A JP H01104400A
- Authority
- JP
- Japan
- Prior art keywords
- sludge
- heavy metal
- mineral acid
- harmful
- added
- 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
- 239000010802 sludge Substances 0.000 title claims abstract description 38
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 claims abstract description 15
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 12
- 239000011707 mineral Substances 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 11
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052793 cadmium Inorganic materials 0.000 claims abstract description 8
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 8
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052753 mercury Inorganic materials 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract 2
- 238000009877 rendering Methods 0.000 claims 1
- 150000003839 salts Chemical class 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract description 6
- 239000013522 chelant Substances 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000003472 neutralizing effect Effects 0.000 abstract 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000004065 wastewater treatment Methods 0.000 description 4
- 238000004090 dissolution Methods 0.000 description 3
- 238000010828 elution Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- AOJJSUZBOXZQNB-VTZDEGQISA-N 4'-epidoxorubicin Chemical compound O([C@H]1C[C@@](O)(CC=2C(O)=C3C(=O)C=4C=CC=C(C=4C(=O)C3=C(O)C=21)OC)C(=O)CO)[C@H]1C[C@H](N)[C@@H](O)[C@H](C)O1 AOJJSUZBOXZQNB-VTZDEGQISA-N 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 238000001784 detoxification Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000004679 hydroxides Chemical class 0.000 description 1
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical class Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 1
- 238000010169 landfilling Methods 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、都市とみ、廃棄物等の焼却炉廃水処理工程か
らでる汚泥の無害化の方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for detoxifying sludge produced from an incinerator wastewater treatment process for municipal waste, waste, etc.
都市とみ、廃棄物等の焼却炉廃水処理工程からでる汚泥
には、水銀、カドミウム、鉛、などの有害重金属が含ま
れている。The sludge produced from the incinerator wastewater treatment process for municipal waste contains toxic heavy metals such as mercury, cadmium, and lead.
すなわち、廃水中に含まれるこれら重金属を不溶化して
汚泥として廃水から分離したものであり９重金属が濃縮
されている。ところが、この様な有害重金属を含む汚泥
の有効な処分方法は確立されておらず１通常はこの汚泥
を脱水し溶出試験によって埋立基準値を満たす事を確認
したものを埋立処分している。従って、これら有害重金
属は多量に含まれたま一理立されており、長期間に亘っ
て埋立地滲出水中に溶は出し。That is, these heavy metals contained in wastewater are insolubilized and separated from the wastewater as sludge, and nine heavy metals are concentrated. However, an effective method for disposing of sludge containing such toxic heavy metals has not been established.1 Usually, this sludge is dehydrated and, after elution tests are conducted, the sludge is disposed of in a landfill after it has been confirmed that it satisfies the landfill standards. Therefore, it is believed that these toxic heavy metals are contained in large amounts and are leached into the leachate from landfills over a long period of time.
埋立地周辺を汚染することになる。This will contaminate the area around the landfill.
本発明は、この様な有害重金属を含む汚泥を埋立に支障
ない様にするための無害化の方法を提供するものである
。The present invention provides a method for making sludge containing such harmful heavy metals harmless so that it will not be a hindrance to landfilling.
最も簡単な無害化の方法は、汚泥に鉱酸を加えてこれら
の有害重金属のみを溶解し、不溶物と固液分離すれば良
い。しかし、汚泥中には。The simplest method for detoxifying the sludge is to dissolve only these harmful heavy metals by adding mineral acid to the sludge, and then separate the sludge from insoluble matter into solid and liquid. However, in the sludge.
廃水中に含まれている有機物や、廃水処理工程で加えら
れた液体キレート剤などの有機物が入っており、このた
め鉱酸を加えても汚泥中の重金属は一部しか溶解せず、
従って２本法は実用に供し得なかった。The sludge contains organic substances such as organic substances contained in wastewater and liquid chelating agents added during the wastewater treatment process, so even if mineral acids are added, only a portion of the heavy metals in the sludge are dissolved.
Therefore, the two methods could not be put to practical use.
本発明は、この鉱酸による有害重金属の溶解を容易にな
し得る前処理方法を提供するものである。The present invention provides a pretreatment method that can easily dissolve harmful heavy metals using mineral acids.
汚泥中の重金属は、水酸化物、有機重金属化合物などの
形になってお９．特にキレート化合物の形になったもの
は安定で、鉱酸を加えても溶解し難い。そこで、この安
定な化合物であるキレート化合物を形成する機能を１次
亜塩素酸及び／又は次亜塩素酸塩類を加えることによっ
て、阻害し得ることを見出した。Heavy metals in sludge are in the form of hydroxides, organic heavy metal compounds, etc.9. In particular, compounds in the form of chelate compounds are stable and difficult to dissolve even when mineral acids are added. Therefore, it has been found that the function of forming a chelate compound, which is a stable compound, can be inhibited by adding primary hypochlorous acid and/or hypochlorites.
次亜塩素酸の酸化作用によって、有機物の一部が酸化さ
れキレート形成能を失うものと推定される。It is presumed that due to the oxidizing action of hypochlorous acid, some organic substances are oxidized and lose their chelate-forming ability.
第１図は本発明に基く汚泥無害化処理方法の一実施例で
ある。この例に於ては前処理ｌ、溶解槽２．固液分離装
置３によって構成されている。FIG. 1 shows an embodiment of the sludge detoxification treatment method according to the present invention. In this example, pretreatment 1, dissolution tank 2. It is composed of a solid-liquid separator 3.
水銀、カドミウム、鉛などの有害重金属を含有する汚泥
４は、前処理槽１に入り、ここで次亜塩素酸５が加えら
れて、攪拌、混合されこの間に有機物の一部が酸化され
キレート化合物形成能が阻害される。この様な処理を受
けた前処理汚泥６は次いで溶解槽２に入り、鉱酸７が加
えられてＰＨ２〜３に調整されて攪拌混合され。Sludge 4 containing harmful heavy metals such as mercury, cadmium, and lead enters the pretreatment tank 1, where hypochlorous acid 5 is added and stirred and mixed, during which time some of the organic matter is oxidized and converted to chelate compounds. The ability to form is inhibited. The pretreated sludge 6 that has undergone such treatment then enters the dissolution tank 2, where mineral acid 7 is added to adjust the pH to 2 to 3, and the mixture is stirred and mixed.
この間に水銀、カドミウム、鉛などの有害重金属は溶解
する。そして、この重金属溶解汚泥８は固液分離装置３
に送られ、ここで重金属除去汚泥９と重金属溶解液１０
とに分離される。重金属除去汚泥９は、埋立処分が可能
となり、又。During this time, harmful heavy metals such as mercury, cadmium, and lead are dissolved. This heavy metal dissolved sludge 8 is then transferred to the solid-liquid separator 3.
Here, heavy metal removed sludge 9 and heavy metal solution 10
It is separated into The heavy metal removed sludge 9 can be disposed of in a landfill.
重金属溶解液１０は中和処理、或は吸着処理その他の°
方法によって重金属を回収、再利用する事が可能となる
。The heavy metal solution 10 is subjected to neutralization treatment, adsorption treatment, or other
The method makes it possible to recover and reuse heavy metals.
次に本発明の実施例を示す。Next, examples of the present invention will be shown.
実験例
ごみ焼却炉廃水処理工程から発生した汚泥（重金属含有
量、水銀ａｏｏ ｍｖ’（１、カドミウム２ ｍｉｎ
、鉛５ｏｍＶ／ｇ ）に対し、硫酸を加えてｐＨ２，５
に調整し、 １０分間攪拌を行った後遠心分離し、上澄
液をｆｆ１５ ＡＦｉ紙にて濾過した炉液の分析を行っ
たところ、各重金属の溶出率は。Experimental example Sludge generated from waste incinerator wastewater treatment process (heavy metal content, mercury aoo mv' (1, cadmium 2 min)
, lead 5omV/g), add sulfuric acid to pH 2.5.
After stirring for 10 minutes and centrifuging, the supernatant liquid was filtered through ff15 AFi paper and analyzed.The elution rate of each heavy metal was as follows.
水銀０．０１％、カドミウム３０％、鉛５０％であった
。The contents were 0.01% mercury, 30% cadmium, and 50% lead.
これに対し、同汚泥に次亜塩素酸ソーダを同汚泥の（Ｘ
）Ｄ値の３倍当量を加えて１時間常温で攪拌した後、前
と同様に硫酸を加えて以下同じ操作を行ったところ、各
重金属の溶出率はいずれも９９％以上となった。On the other hand, sodium hypochlorite was added to the same sludge (X
) After adding 3 times the equivalent of the D value and stirring at room temperature for 1 hour, sulfuric acid was added in the same manner as before and the same operation was performed, and the elution rate of each heavy metal was 99% or more.
本発明によれば、従来は困難であった水銀。 According to the present invention, mercury, which has been difficult in the past.
カドミウム、鉛の有害重金属と有機物を共合する汚泥か
ら該重金属を鉱酸によって溶解させる事が、容易に行な
える様になり、汚泥の無害化処理が実用化可能となる。It is now possible to easily dissolve heavy metals from sludge in which harmful heavy metals such as cadmium and lead are combined with organic matter using mineral acids, and it becomes possible to put the sludge to harmless treatment into practical use.
第１図は本発明の一実施例としての系統説明図である。
ｌ・・・前処理槽、２・・・溶解槽、３・・・固液分離
装置、４・・・汚泥、５・・・次亜塩素酸、６・・・前
処理汚泥、７・・・鉱酸、８・・・重金属溶解汚泥、９
・・・重金属除去汚泥、１０・・・重金属溶解液。FIG. 1 is an explanatory diagram of a system as an embodiment of the present invention. l...Pretreatment tank, 2...Dissolution tank, 3...Solid-liquid separator, 4...Sludge, 5...Hypochlorous acid, 6...Pretreatment sludge, 7...・Mineral acid, 8...Heavy metal dissolved sludge, 9
...Heavy metal removed sludge, 10...Heavy metal solution.
Claims (1)
重金属を溶解し固液分離によって汚泥を無害化する方法
に於て、鉱酸添加前に、次亜塩素酸又は、次亜塩素酸塩
類の少なくとも一方を汚泥に添加する事を特徴とする重
金属含有汚泥の処理方法。In the method of adding mineral acid to sludge containing mercury, cadmium, and lead to dissolve the heavy metals and rendering the sludge harmless through solid-liquid separation, hypochlorous acid or hypochlorous acid is added before adding mineral acid. A method for treating sludge containing heavy metals, characterized by adding at least one of salts to the sludge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25878587A JPH01104400A (en) | 1987-10-14 | 1987-10-14 | Treatment of sludge containing heavy metal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25878587A JPH01104400A (en) | 1987-10-14 | 1987-10-14 | Treatment of sludge containing heavy metal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01104400A true JPH01104400A (en) | 1989-04-21 |
Family
ID=17325040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25878587A Pending JPH01104400A (en) | 1987-10-14 | 1987-10-14 | Treatment of sludge containing heavy metal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01104400A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2236749A (en) * | 1988-06-23 | 1991-04-17 | Antonio Maria Celi | Removing metals from sludge or soll |
| JPH06315698A (en) * | 1990-10-31 | 1994-11-15 | Green Environment Syst Ltd | How to detoxify sewage sludge |
| KR20020093732A (en) * | 2002-11-21 | 2002-12-16 | 조경제 | The method of heavy metal extraction from sludge with acid treatment and heavy metal removal |
| CN107585984A (en) * | 2017-10-30 | 2018-01-16 | 江苏和合环保集团有限公司 | A kind of composite sludge curing agent |
-
1987
- 1987-10-14 JP JP25878587A patent/JPH01104400A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2236749A (en) * | 1988-06-23 | 1991-04-17 | Antonio Maria Celi | Removing metals from sludge or soll |
| JPH06315698A (en) * | 1990-10-31 | 1994-11-15 | Green Environment Syst Ltd | How to detoxify sewage sludge |
| KR20020093732A (en) * | 2002-11-21 | 2002-12-16 | 조경제 | The method of heavy metal extraction from sludge with acid treatment and heavy metal removal |
| CN107585984A (en) * | 2017-10-30 | 2018-01-16 | 江苏和合环保集团有限公司 | A kind of composite sludge curing agent |
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