关键词: 铜矿选冶渣, 硫酸盐还原菌, 嗜酸性亚铁硫杆菌, 生物炭, 生物有效性

Abstract: In order to solve the problem of multiple heavy metal composite pollution in a certain metallurgical slag in Sichuan,biochar solidification microbial experiment and adsorption kinetics experiment were used to study the synergistic effect of biochar and microorganisms on the remediation of multiple heavy metals and the adsorption kinetics behavior of multiple heavy metals on the surface of biochar. Fourier transform infrared spectroscopy ( FTIR) and scanning electron microscopy (SEM) were used to explore the interface mechanism of biochar group enhanced microbial remediation of heavy metals. The results showed that in the anaerobic atmosphere,Sulfate-reducing bacteria ( SBR) and acidophilic thiobacillus ferrooxidans (At. f,pH = 5. 0) were mixed at volume ratio of 3 ∶ 2,the inoculation amount was 20%,the addition amount of biochar was 10%,and after 30 days of solidification,the bioavailability reduction rates of iron,zinc,copper,lead and chromium in the dressing and smelting slag were 98. 37%,90. 32%,90. 81%,96. 52% and 100%,respectively. The adsorption kinetics test showed that the reaction process was chemical reaction. Fourier transform infrared spectroscopy and scanning electron microscopy analysis indicated that heavy metals react with hydroxyl and carboxyl groups on the surface of biochar,solidifying / stabilizing heavy metals such as Zn and Cu in the form of precipitation,reducing their bioavailability.

Key words: copper ore dressing-smelting slag,sulfate reducing bacteria,acidophilic thiobacillus ferrooxidans,biochar,bioavailability