ZERO LIQUID DISCHARGE PROCESS

Disclosed is a zero discharge process which comprises the following steps: pretreating sulfuric acid wastewater containing a heavy metal component to extract and remove the heavy metal component; preparing gypsum by adding calcium carbonate to the pretreated sulfuric acid wastewater; neutralizing a...

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Bibliographic Details
Main Authors PARK YOUNG MIN, JEONG, MYEONG JIN, KIM, TAEK HOON
Format Patent
LanguageEnglish
Korean
Published 06.12.2019
Subjects
CHEMISTRY
METALLURGY
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Summary:Disclosed is a zero discharge process which comprises the following steps: pretreating sulfuric acid wastewater containing a heavy metal component to extract and remove the heavy metal component; preparing gypsum by adding calcium carbonate to the pretreated sulfuric acid wastewater; neutralizing a processing solution remaining after the gypsum is separated; removing fluorine from the neutralized processing solution; removing chlorine from the fluorine-removed processing solution; and using the chlorine-removed processing solution to clean sulfite gas. 중금속 성분이 포함된 황산 폐수를 전처리하여 상기 중금속 성분을 석출 제거하는 단계; 상기 전처리된 황산 폐수에 탄산칼슘을 투입하여 석고를 제조하는 단계; 상기 석고가 분리되고 남은 공정액을 중화하는 단계; 상기 중화된 공정액으로부터 불소를 제거하는 단계; 상기 불소가 제거된 공정액으로부터 염소를 제거하는 단계; 및 상기 염소가 제거된 공정액을 아황산 가스의 세정에 이용하는 단계;를 포함하는 무방류 공정이 소개된다.
Bibliography:Application Number: KR20180060531