摘要
采用酸浸?生物法处理铬渣以进行有效的还原解毒.首先分析了铬渣的物相和组成,然后鼓入CO2进行酸浸,再结合硫酸盐还原菌浸取和还原.结果表明,经过生物反应36h后,残渣中水溶性六价铬含量降到了2mg/kg,达到了铬盐工业污染物排放标准GB4280?84的要求.
Chromite ore processing residue （COPR） is a kind of solid waste in the production of chromate by roasting with lime. There exists tremendous threat to environment owing to the oxidation of Cr（VI）. In this work, a treatment scheme was developed using sulfate-reducing bacteria （SRB） as bio-reducing agent after HCI or CO2 was used to acidify the COPR to neutral state. The results showed that the leaching of water combined with CO2 blowing could gain an advantage over HCI leaching. Then SRB and substrates were added to the solid-liquid mixture after the acidifying for bio-reduction. It was found that water soluble Cr（VI） was lowered to 2 mg/kg of waste after 36 h treatment, which is below the GB4280-84 limit of 5 mg/kg.
出处
《过程工程学报》
EI
CAS
CSCD
北大核心
2006年第1期55-58,共4页
The Chinese Journal of Process Engineering
关键词
铬渣
酸浸
二氧化碳
硫酸盐还原菌
生物还原
chromite ore processing residue
acid leaching
carbon dioxide
sulfate reducing bacteria
bio-reduction
