KR100388033B1 - Method for Extracting Hexavalent Chromium from Trivalent Chromium-Containing Wastewater Sludge - Google Patents
Method for Extracting Hexavalent Chromium from Trivalent Chromium-Containing Wastewater Sludge Download PDFInfo
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- KR100388033B1 KR100388033B1 KR10-1998-0056713A KR19980056713A KR100388033B1 KR 100388033 B1 KR100388033 B1 KR 100388033B1 KR 19980056713 A KR19980056713 A KR 19980056713A KR 100388033 B1 KR100388033 B1 KR 100388033B1
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- sludge
- chromium
- hexavalent chromium
- containing wastewater
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- 239000010802 sludge Substances 0.000 title claims abstract description 62
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 239000002351 wastewater Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title abstract description 11
- 239000011651 chromium Substances 0.000 claims abstract description 74
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 48
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 28
- 239000003513 alkali Substances 0.000 claims abstract description 10
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 239000002699 waste material Substances 0.000 claims description 8
- 238000000605 extraction Methods 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 238000006386 neutralization reaction Methods 0.000 claims description 4
- 230000003472 neutralizing effect Effects 0.000 claims description 4
- 235000011121 sodium hydroxide Nutrition 0.000 description 12
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 10
- 239000000243 solution Substances 0.000 description 10
- 239000000292 calcium oxide Substances 0.000 description 5
- 235000012255 calcium oxide Nutrition 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000001056 green pigment Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/26—Treatment of water, waste water, or sewage by extraction
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/80—Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Treatment Of Sludge (AREA)
- Removal Of Specific Substances (AREA)
Abstract
본 발명은 3가 크롬 함유 폐수 슬러지로부터의 6가 크롬 추출 방법에 관한 것으로,The present invention relates to a method for extracting hexavalent chromium from trivalent chromium containing wastewater sludge,
6가크롬함유 폐수에 환원제로서 FeSO4또는 FeCl2를 첨가하여 6가 크롬을 3가 크롬으로 환원처리한 다음, 이를 NaOH 또는 Ca(OH)2의 알칼리를 이용하여 중화처리함으로써 중화 슬러지를 형성하고, 여기에 NaOH를 첨가하여 상기 중화 슬러지를 pH 13이상의 강알칼리성 조건으로 유지하면서 H2O2를 슬러지내에 존재하는 Cr의 몰수 대비 1몰 이상이 되도록 첨가하여 Na2Cr2O7을 형성한 다음 여과하여 형성된 6가 크롬 의 Na2Cr2O7과 슬러지를 분리함으로써 6가 크롬 Na2Cr2O7을 추출해낸다.FeSO 4 or FeCl 2 was added to the hexavalent chromium-containing waste water to reduce the hexavalent chromium to trivalent chromium, and then neutralized with alkali of NaOH or Ca (OH) 2 to form neutralized sludge. In addition, NaOH was added thereto to maintain the neutralized sludge under strong alkaline conditions of pH 13 or higher, so that H 2 O 2 was added at least 1 mole relative to the number of moles of Cr present in the sludge to form Na 2 Cr 2 O 7 . by filtering to remove the hexavalent Cr 2 O 7 as the sludge 2 Na of chromium formed hexavalent chromium produces extract the Na 2 Cr 2 O 7.
상기한 바에 따르면, 3가 크롬 함유 폐수 슬러지에 pH가 13이상인 강알칼리성 조건하에 H2O2를 적정량 첨가함으로써 6가 크롬 용액을 효과적으로 추출해낼 수 있을 뿐만 아니라 슬러지를 효과적으로 재활용함으로써 슬러지의 증량 문제를 해결할 수 있다.According to the above, by adding an appropriate amount of H 2 O 2 to the trivalent chromium-containing wastewater sludge under strong alkaline conditions of pH 13 or higher, the hexavalent chromium solution can be effectively extracted and the sludge can be efficiently recycled to increase the sludge problem. I can solve it.
Description
본 발명은 3가 크롬 함유 폐수 슬러지로부터의 6가 크롬을 추출하는 방법에 관한 것으로, 보다 상세하게는 3가 크롬 함유 폐수 슬러지에 존재하는 Cr(OH)3를 강알칼리성 조건하에 용해시켜 6가 크롬 성분만을 추출해내는 방법에 관한 것이다.The present invention relates to a method for extracting hexavalent chromium from trivalent chromium-containing wastewater sludge, and more particularly, to dissolving Cr (OH) 3 present in trivalent chromium-containing wastewater sludge under strong alkaline conditions. It relates to extracting only the ingredients.
6가 크롬 함유 폐액을 처리하는 기술로서는 여러 가지가 보고되고 있지만, 현재 대부분은 NaHSO3또는 Na2S2O3등의 환원제를 이용하여 6가 크롬 폐액을 환원처리한 다음 생석회를 이용하여 중화처리하고 이때 발생되는 슬러지는 매립하고 있다.Various techniques have been reported for treating hexavalent chromium-containing waste liquor, but most of them are currently reduced by using a reducing agent such as NaHSO 3 or Na 2 S 2 O 3 , and then neutralized by using quicklime. The sludge produced at this time is landfilled.
또한 약품비를 절감하기 위하여 6가 크롬 폐액의 환원처리용 환원제로서 FeSO4,FeCl2등의 폐산을 이용하여 환원시킨 다음, 환원처리된 폐액을 가성소다 또는 생석회등의 알칼리를 이용하여 중화처리하고 이때 발생된 슬러지 역시 시멘트와 고형화시켜 매립하고 있는 실정이다.In addition, in order to reduce the chemical cost, the reducing agent for reducing the hexavalent chromium waste solution is reduced using waste acid such as FeSO 4 and FeCl 2, and the reduced waste solution is neutralized with alkali such as caustic soda or quicklime. The sludge generated is also solidified with cement and landfilled.
그러나 상기 방법들은 중화슬러지의 증량 문제를 초래하며 폐기처리시 심각한 환경 문제를 야기시킬 수 있다. 따라서 상기와 같이 발생된 슬러지의 적절한 재활용이 요구되고 있다.However, these methods lead to problems with the increase of neutralized sludge and can cause serious environmental problems during disposal. Therefore, proper recycling of the sludge generated as above is required.
이에 본 발명의 목적은 3가 크롬 함유 폐수 슬러지에 강알칼리성 조건하에 H2O2를 첨가함으로써 6가 크롬을 추출해내는 방법을 제공하려는데 있다.Accordingly, an object of the present invention is to provide a method for extracting hexavalent chromium by adding H 2 O 2 to a trivalent chromium-containing wastewater sludge under strong alkaline conditions.
본 발명의 다른 목적은 3가 크롬 함유 폐수 슬러지를 슬러지 증량 문제가 없이 재활용하는 방법을 제공하는 것이다.Another object of the present invention is to provide a process for recycling trivalent chromium-containing wastewater sludge without the problem of sludge increase.
본 발명에 의하면,According to the invention,
(a)6가크롬함유 폐수에 환원제로서 FeSO4또는 FeCl2를 첨가하여 6가 크롬을 3가 크롬으로 환원처리한 다음, 이를 NaOH 또는 Ca(OH)2의 알칼리를 이용하여 중화처리함으로써 중화 슬러지를 형성하는 단계;(a) Neutralizing sludge by adding FeSO 4 or FeCl 2 as reducing agent to the hexavalent chromium-containing wastewater, reducing hexavalent chromium to trivalent chromium, and neutralizing it with alkali of NaOH or Ca (OH) 2 . Forming a;
(b)NaOH를 첨가하여 상기 중화 슬러지를 pH 13이상의 강알칼리성 조건으로 유지하면서, 중화슬러지에 H2O2를 슬러지내에 존재하는 Cr의 몰수 대비 1몰 이상이 되도록 첨가하여 Na2Cr2O7을 형성하는 단계; 및(b) by adding NaOH to maintain the neutralized sludge under strong alkaline conditions of pH 13 or higher, adding H 2 O 2 to the neutralized sludge to be at least 1 mole relative to the number of moles of Cr present in the sludge, thereby reducing Na 2 Cr 2 O 7 Forming a; And
(c)그후 여과하여 형성된 6가 크롬의 Na2Cr2O7과 슬러지를 분리함으로써 Na2Cr2O7을 추출하는 단계;로 이루어지는 폐산으로 환원 및 중화시켜 얻어진 3가 크롬 함유 폐수 슬러지로부터 6가 크롬을 추출하는 방법이 제공된다.(c) extracting Na 2 Cr 2 O 7 by separating the sludge and Na 2 Cr 2 O 7 of the hexavalent chromium formed by filtration. 6 from the trivalent chromium-containing wastewater sludge obtained by reduction and neutralization with waste acid. A method of extracting chromium is provided.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명에서는 3가 크롬 함유 폐수 슬러지내에 존재하는 Cr(OH)3를 강알칼리성 조건하에 용해시키고, 이와 같이 용해된 Cr(OH)3를 H2O2를 이용하여 6가 크롬 상태로 산화시킴으로써 6가 크롬액만을 추출하는 것이다.In the present invention, Cr (OH) 3 present in the trivalent chromium-containing wastewater sludge is dissolved under strong alkaline conditions, and the thus-dissolved Cr (OH) 3 is oxidized to hexavalent chromium state using H 2 O 2 . It is to extract only chromium liquid.
본 발명의 단계(a)에서는 먼저 6가크롬함유 폐수에 6가 크롬 폐액의 환원처리용 환원제로서 FeSO4,FeCl2등의 폐산을 이용하여 6가 크롬을 3가 크롬으로 환원처리한다. 이를 반응식으로 나타내면 다음과 같다:In step (a) of the present invention, hexavalent chromium is reduced to trivalent chromium using waste acid such as FeSO 4 and FeCl 2 as a reducing agent for reducing hexavalent chromium waste liquid in hexavalent chromium-containing wastewater. This is represented by the scheme:
이와 같이 환원처리된 폐액을 가성소다 또는 생석회등의 알칼리를 이용하여 중화처리를 실시하면 슬러지를 생성하게 된다. 이때 알칼리로서 가성소다를 이용하여 중화처리하는 경우에는 Cr(OH)3와 Fe(OH)3가 혼재된 슬러지가 생성되게 되며, 생석회를 이용하여 중화처리하는 경우에는 Cr(OH)3, Fe(OH)3및 CaSO4등이 혼재된 슬러지가 생성된다.The sludge is neutralized by using an alkali, such as caustic soda or quicklime, to produce sludge. At this time, when neutralization is performed using caustic soda as alkali, sludge mixed with Cr (OH) 3 and Fe (OH) 3 is formed. When neutralization is performed using quicklime, Cr (OH) 3 and Fe ( Sludge mixed with OH) 3 and CaSO 4 is produced.
단계(b)에서는 상기 중화슬러지에 NaOH를 첨가하여 슬러지를 pH13이상의 강알칼리성 조건으로 유지한다.In step (b), NaOH is added to the neutralized sludge to maintain the sludge under strong alkaline conditions of pH 13 or above.
중화 슬러지내에 존재하는 Cr(OH)3는 pH13이상의 강알칼리 영역에서는 Cr(OH)4 -의 형태로 용해하는 성질이 있으며, 일단 용해시킨 다음 산화시키면 6가 크롬의 형태로 크롬을 추출해낼 수 있다. 만약 상기 pH를 13미만으로 유지시키게 되면, 불순물중 처리하고자 하는 Cr(OH)3가 용해되지 않으므로 이러한 상승 효과를 기대하기 어렵다.Cr (OH) 3 present in the neutralized sludge has the property of dissolving in the form of Cr (OH) 4 − in the strong alkali region above pH 13, and once dissolved and then oxidized, chromium can be extracted in the form of hexavalent chromium. If the pH is maintained at less than 13, it is difficult to expect such a synergistic effect because Cr (OH) 3 to be treated in impurities is not dissolved.
또한 슬러지내에 Cr(OH)3와 함께 혼재하는 Fe(OH)3및 CaSO4등은 강알칼리 영역에서도 용해되지 않고 염의 형태로 잔존하기 때문에 Cr(OH)3가 일으키는 반응에 참여하지는 못하고 불순물로서 잔류하게 된다.In addition, Fe (OH) 3 and CaSO 4 mixed together with Cr (OH) 3 in the sludge do not dissolve even in the strong alkali region and remain in the form of salt, so they do not participate in the reaction caused by Cr (OH) 3 and remain as impurities. do.
상기 중화슬러지를 pH13이상의 강알칼리성 조건으로 유지시킴과 동시에 H2O2를 슬러지내에 존재하는 Cr의 몰수 대비 1몰 이상이 되도록 첨가한다.The neutralized sludge is maintained at a strongly alkaline condition of pH 13 or higher, and at the same time, H 2 O 2 is added so as to be at least 1 mol relative to the number of moles of Cr present in the sludge.
사용하는 H2O2의 첨가량이 폐수 슬러지중 Cr(OH)3의 몰비를 기준으로 H2O2의 몰비가 1미만이 되도록 사용되면, Cr을 산화하는 반응 자체가 줄어들어 Na2Cr2O7생성량이 감소되므로 바람직하지 않다.If the content of H 2 O 2 used used so that the waste water sludge of the Cr (OH), based on the molar ratio of 3 is less than a molar ratio of H 2 O 2 1, by reducing the reaction itself for the oxidation of Cr Na 2 Cr 2 O 7 It is not preferable because the production amount is reduced.
상기한 바와 같이, 슬러지의 pH를 조절하는데 NaOH를 사용함과 동시에 산화제로서 H2O2를 사용하여야만 하기식 2에 기재한 바와 같이 6가 크롬 용액인 Na2Cr2O7를 제조할 수 있다:As described above, the use of NaOH to adjust the pH of the sludge and the use of H 2 O 2 as the oxidizing agent can produce Na 2 Cr 2 O 7 as a hexavalent chromium solution as described in Equation 2 below:
본 발명의 단계(c)에서는 여과 공정을 거쳐 Na2Cr2O7과 슬러지를 분리함으로써 Na2Cr2O7만을 추출해낸다.In step (c) of the present invention, only Na 2 Cr 2 O 7 is extracted by separating Na 2 Cr 2 O 7 and sludge through a filtration process.
즉 Cr(OH)3와 함께 폐수 슬러지내에는 Fe(OH)3와 CaSO4등의 성분이 강알칼리 영역에서 반응하지 않고 잔존하므로, 여과 공정을 거치면 이와 같은 성분들은 슬러지로 제거되고 얻고자 하는 6가 크롬 용액인 Na2Cr2O7만이 추출되게 된다.In other words, Fe (OH) 3 and CaSO 4 remain in the waste water sludge together with Cr (OH) 3 without reacting in the strong alkali region. Only Na 2 Cr 2 O 7 , a chromium solution, is extracted.
이와 같이 추출된 Na2Cr2O7은 도금용액제조시 출발 원료 혹은 크롬 산화물의 녹색 안료와 같은 크롬 성분 함유 제품을 제조하는데 있어 출발 원료로서 사용된 다.The extracted Na 2 Cr 2 O 7 is used as a starting material in the manufacture of chromium-containing products such as starting materials in the production of plating solutions or green pigments of chromium oxide.
이하, 실시예를 통하여 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
<실시예><Example>
크롬 도금 공정에서 발생한 6가 크롬 함유 폐수를 FeSO4로 환원처리하고 생석회로 중화처리하여 생성된 철 및 크롬 혼합 슬러지로부터 Cr 함량을 측정한 결과 10중량%였다.Cr content of the hexavalent chromium-containing wastewater generated in the chromium plating process was reduced with FeSO 4 and neutralized with quicklime.
상기 슬러지에 pH를 NaOH를 이용하여 pH13으로 유지시킨 다음, 여기에 폐수 슬러지중 Cr(OH)3의 몰비를 기준으로 H2O2를 1몰비로 첨가하여 반응시켰다.The pH of the sludge was maintained at pH 13 using NaOH, and then reacted with H 2 O 2 in a molar ratio based on the molar ratio of Cr (OH) 3 in the wastewater sludge.
반응 용액내에 잔류하는 슬러지는 여과하여 제거한 다음, 얻어진 6가 크롬 화합물의 수율로부터 얻어진 크롬 추출율은 중화 슬러지내 존재하는 Cr함량 대비 90중량%였다.After the sludge remaining in the reaction solution was filtered off, the chromium extraction rate obtained from the yield of the obtained hexavalent chromium compound was 90% by weight relative to the Cr content present in the neutralized sludge.
즉 본 실시예에 기재된 조건에 의하면, 슬러지중 크롬을 최대한 용해시킬 수 있으며 일단 용해된 크롬은 6가 크롬 용액으로 전환시켜 추출해낼 수 있었다.In other words, according to the conditions described in this example, chromium in the sludge can be dissolved to the maximum, and once dissolved, chromium can be converted into a hexavalent chromium solution and extracted.
<비교예 1>Comparative Example 1
HH 22 OO 22 의 첨가량이 크롬 추출율에 미치는 영향Effect of Addition of Chloride on Chromium Extraction Rate
폐수 슬러지중 Cr(OH)3의 몰비를 기준으로 H2O2를 0.5몰비로 첨가한 것을 제외하고는 실시예와 동일한 방법을 반복하였다. 그 결과 얻어진 크롬 추출율은 중화 슬러지내 존재하는 Cr 함량 대비 35중량%였다.The same method as in Example was repeated except that H 2 O 2 was added at a molar ratio of 0.5 based on the molar ratio of Cr (OH) 3 in the wastewater sludge. The resulting chromium extraction rate was 35% by weight relative to the Cr content present in the neutralized sludge.
즉 처리하고자 하는 폐수 슬러지를 NaOH를 이용하여 pH가 13이 되도록 유지한 다음 폐수 슬러지중 Cr(OH)3의 몰비를 기준으로 H2O2를 0.5몰비로 첨가한 경우에는 슬러지중 Cr(OH)3는 충분히 용해시킬 수 있으나, 첨가하는 H2O2의 양이 부족하므로 용해된 Cr(OH)3를 산화시키기에 바람직하지 않음을 알 수 있다.That is, if the wastewater sludge to be treated is maintained at pH 13 using NaOH and then H 2 O 2 is added at a 0.5 molar ratio based on the molar ratio of Cr (OH) 3 in the wastewater sludge, Cr (OH) in the sludge 3 can be sufficiently dissolved, but since the amount of H 2 O 2 added is insufficient, it can be seen that it is not preferable to oxidize dissolved Cr (OH) 3 .
<비교예 2>Comparative Example 2
알칼리 용액의 pH가 크롬 추출율에 미치는 영향Effect of pH of Alkaline Solution on Chromium Extraction Rate
pH가 10인 가성소다 용액을 사용한 것을 제외하고는 실시예와 동일한 방법을 반복하였다. 그 결과 얻어진 크롬 추출율은 중화 슬러지내 존재하는 Cr 함량 대비 80중량%였다.The same procedure as in Example was repeated except that caustic soda solution having a pH of 10 was used. The resulting chromium extraction rate was 80% by weight relative to the Cr content present in the neutralized sludge.
즉 처리하고자 하는 폐수 슬러지를 NaOH를 이용하여 pH가 10이 되도록 유지한 다음 폐수 슬러지중 Cr(OH)3의 몰비를 기준으로 H2O2를 1몰비로 첨가한 경우에는 Cr(OH)3가 일단 용해되면 H2O2를 사용하여 모두 6가 크롬 용액으로 산화시킬 수 있으나, 여기서는 슬러지로 부터 Cr(OH)3를 충분히 용해시킬 수 없으므로 바람직하지 않음을 알 수 있다.In other words, if the wastewater sludge to be treated is kept at a pH of 10 using NaOH and then H 2 O 2 is added at a molar ratio of Cr (OH) 3 in the wastewater sludge, Cr (OH) 3 is Once dissolved, all can be oxidized to a hexavalent chromium solution using H 2 O 2 , but it can be seen that it is not preferable because Cr (OH) 3 cannot be sufficiently dissolved from the sludge.
상기한 바에 따르면, 3가 크롬 함유 폐수 슬러지에 pH가 13이상인 강알칼리 조건하에 H2O2를 적정량 첨가함으로써 6가 크롬 용액을 효과적으로 추출해낼 수 있을 뿐만 아니라 슬러지를 효과적으로 재활용함으로써 슬러지의 증량 문제를 해결할 수 있다.According to the above, by adding an appropriate amount of H 2 O 2 to the trivalent chromium-containing wastewater sludge under strong alkali conditions of pH 13 or more, the hexavalent chromium solution can be effectively extracted, and the sludge is effectively recycled to solve the problem of increasing sludge. Can be.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150700A (en) * | 1984-08-18 | 1986-03-12 | Kawasaki Steel Corp | Treatment of waste solution |
| JPS61234998A (en) * | 1985-04-09 | 1986-10-20 | Kurita Water Ind Ltd | Treatment of waste water containing chromium |
| JPH05228478A (en) * | 1992-02-17 | 1993-09-07 | Nisshin Steel Co Ltd | Process to make harmless waste liquid containing hexavalent chromium |
| KR970074673A (en) * | 1996-05-16 | 1997-12-10 | 김종진 | METHOD AND APPARATUS FOR TREATING METHODS |
| KR20000039859A (en) * | 1998-12-16 | 2000-07-05 | 이구택 | Preparation method chromic acid using cr6+ containing waste solution |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6150700A (en) * | 1984-08-18 | 1986-03-12 | Kawasaki Steel Corp | Treatment of waste solution |
| JPS61234998A (en) * | 1985-04-09 | 1986-10-20 | Kurita Water Ind Ltd | Treatment of waste water containing chromium |
| JPH05228478A (en) * | 1992-02-17 | 1993-09-07 | Nisshin Steel Co Ltd | Process to make harmless waste liquid containing hexavalent chromium |
| KR970074673A (en) * | 1996-05-16 | 1997-12-10 | 김종진 | METHOD AND APPARATUS FOR TREATING METHODS |
| KR20000039859A (en) * | 1998-12-16 | 2000-07-05 | 이구택 | Preparation method chromic acid using cr6+ containing waste solution |
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