公开(公告)号：EP2559667A4

公开(公告)日：2013-11-20

申请号：EP11759612

申请日：2011-03-25

Applicant: CHIYODA CORP

Inventor： KAWAMURA KAZUSHIGE ,  OGI SATOSHI ,  SHINOHARA MASAYO

IPC: B01D61/02 ,  C02F1/20 ,  C02F1/44 ,  C02F1/52 ,  C02F1/58 ,  C02F1/66 ,  C02F1/70 ,  C02F1/72 ,  C02F3/12 ,  C02F3/28 ,  C02F3/30 ,  C02F9/00 ,  C02F101/10 ,  C02F101/14 ,  C02F101/16 ,  C02F101/18 ,  C02F101/30 ,  C02F103/18

CPC classification number: C02F9/00 ,  B01D61/025 ,  B01D61/04 ,  B01D2311/04 ,  B01D2311/103 ,  B01D2311/12 ,  B01D2311/18 ,  B01D2311/2626 ,  B01D2311/2634 ,  B01D2311/2642 ,  B01D2311/2665 ,  B01D2311/2688 ,  B01D2315/06 ,  C02F1/20 ,  C02F1/5236 ,  C02F1/66 ,  C02F1/72 ,  C02F3/12 ,  C02F3/28 ,  C02F3/30 ,  C02F2001/5218 ,  C02F2101/101 ,  C02F2101/106 ,  C02F2101/14 ,  C02F2101/16 ,  C02F2101/18 ,  C02F2101/30 ,  C02F2103/18 ,  Y02W10/15 ,  B01D2311/2661

Abstract: Disclosed herein are a treatment method and a treatment system which are capable of inexpensively, efficiently, and safely treating wastewater discharged from a gasification plant in large amounts and containing two or more persistent substances. The method for treating wastewater discharged by wet-cleaning of gas obtained by partial oxidation of fossil fuel includes: a free cyanide removal step 2 in which free cyanides contained in the wastewater are removed by acidifying and aerating the wastewater; a biological treatment step 3 in which the wastewater that has been treated in the free cyanide removal step 2 is biologically treated; and a decomposition treatment step 4 in which COD components contained in the wastewater that has been treated in the biological treatment step 3 are decomposed. The decomposition treatment step 4 is preferably performed by an advanced oxidation treatment means, and may include the step of crystallizing calcium sulfate by adding a calcium-based alkaline agent to the wastewater.