公开(公告)号：US20190091742A1

公开(公告)日：2019-03-28

申请号：US16206759

申请日：2018-11-30

Applicant: QINGDAO TECHNOLOGICAL UNIVERSITY

Inventor： Dalei ZHANG ,  Yuhao ZHAO ,  Yingfei SUN ,  Manqian WANG ,  Xinyu WANG ,  Shuang WANG

IPC: B09C1/08 ,  B09C1/00 ,  C09K17/48

CPC classification number: B09C1/08 ,  B09C1/002 ,  B09C1/10 ,  B09C2101/00 ,  C09K17/48

Abstract: Disclosed is an in-situ detoxification method for a heavily contaminated site by hexavalent chromium. The method includes injecting a chemical reducing agent into a site heavily contaminated with hexavalent chromium, and injecting a chromium soil remediation microbial agent into the site after 0-10 days. The in-situ detoxification method includes: first, in-situ injecting the chemical reducing agent into the soil, preliminarily reducing high-concentration hexavalent chromium such that the hexavalent chromium of high concentration has no toxic effect on the subsequent ecological microbial agent, then in-situ injecting the ecological microbial agent prepared from biogas residue, a carbon source and sulfate into the chromium-containing soil under pressure, and forming a large-scale reducing buffer zone containing sulfate-reducing bacteria and sulfide in a special maintenance manner in the subsurface soil of the site to reduce the hexavalent chromium continuously and effectively.