Selenium recovery from kiln powder of cement manufacturing by chemical leaching and bioreduction.
Selenium recovery from kiln powder of cement manufacturing by chemical leaching and bioreduction.
复制标题
通过化学浸出和生物还原从水泥生产窑粉中回收硒。
DOI：
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发表时间：
2015
影响因子：
2.7
通讯作者：
M. Ike
中科院分区：
文献类型：
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作者：
S. Soda;Ai Hasegawa;M. Kuroda;A. Hanada;Mitsuo Yamashita;M. Ike
提出了采用化学浸出-细菌还原沉淀法回收水泥生产副产窑粉中硒的新工艺。窑粉料浆浓度为10 w/v%， Na2CO3浓度为0.25 M，温度为28℃，产生含硒量约为30 mg-Se/L的废水。将废水稀释4倍，调至pH 8.0作为生物还原预处理。stutzeri假单胞菌NT-I能够将硒酸盐和亚硒酸盐还原为不溶性元素硒，当添加乳酸或甘油时，可从含硒5 mg-Se/L的预处理废水中回收约90%的硒。处理后的废水中硒含量较低，约为日本规定的出水浓度0.1 mg-Se/L。
A novel process by using chemical leaching followed by bacterial reductive precipitation was proposed for selenium recovery from kiln powder as a byproduct of cement manufacturing. The kiln powder at a slurry concentration of 10 w/v% with 0.25 M Na2CO3 at 28°C produced wastewater containing about 30 mg-Se/L selenium. The wastewater was diluted four-fold and adjusted to pH 8.0 as preconditioning for bioreduction. A bacterial strain Pseudomonas stutzeri NT-I, capable of reducing selenate and selenite into insoluble elemental selenium, could recover about 90% selenium from the preconditioned wastewater containing selenium of 5 mg-Se/L when supplemented with lactate or glycerol. The selenium concentrations in the treated wastewater were low around the regulated effluent concentration of 0.1 mg-Se/L in Japan.