Microbial removal of heavy metals from agricultural and marine industrial wastes in a sequential and mixed cultivation

研究了微生物去除农业和海洋工业废物中重金属，特别是镉的效果。在连续和混合培养的蛋白水解微生物和硫酸盐-导出细菌的菌株在提取物中的每一个废物，重金属，如镉几乎完全从提取物中除去的金属硫化物沉淀。这些结果表明，农业和海洋工业废弃物中的重金属主要以结合态存在于金属硫蛋白等重金属结合蛋白中，并通过水解微生物分泌的蛋白酶转化为游离态。硫酸盐还原菌产生的硫化氢和游离态的重金属可以形成金属硫化物沉淀。提供免费膳食准备。还检查了饲料。

Microbial removal of heavy metals, especially cadmium, from agricultural and marine industrial wastes were examined. During sequential and mixed cultivation of proteolytic microbes and a strain of sulfate-educing bacteria in an extracts of each waste, heavy metals like cadmium were removed almost completely from the extract as the metal-sulfide precipitate. Whereas a ant amounts of heavy metals remained in the extract after the cultivation of proteolytic microbes or the sulfate-reducing bacterium alone.These results suggested that heavy metals in agricultural and marine industrial wastes would be present as bound-state with heavy-metal-binding protein such as metallothionein and they would be transformed to the free-state by protease secreted by proteolytic microbes. And then metal-sulfide precipitates could be formed with the free-state of heavy metals and hydrogen sulfide produced by the sulfate-reducing bacterium. Availability of meal-free preparations as. feed were also examined.