矿石粒度与矿浆浓度对混合菌溶解低品位磷矿粉的影响

研究了不同矿石粒度和矿浆浓度下, 来源于根际土壤的混合菌对两种低品位磷矿粉的溶解作用。结果表明, 该混合菌能有效溶解低品位磷矿粉, 并释放出其中的可溶性磷。当矿石粒度和矿浆浓度分别为150 μm和1%时, 混合菌对两种低品位磷矿粉的溶解效果最好。相同反应条件下, 矿物组分不同, 混合菌对磷矿粉的溶解效果不一样。相关性分析结果表明, 培养液中混合菌的生物量与溶磷量之间呈较强正相关, 而pH值和溶磷量之间呈一般负相关。

Effects of Particle Size and Pulp Density on Biosolubilization of Low-grade Rock Phosphate by Mixed Bacteria

The effects of particle size and pulp density on the biosolubilization of two different low-grade rock phosphates by mixed bacteria were investigated. The results show that mixed bacteria from plant rhizospheric soils could efficiently solubilize the low-grade rock phosphate and release the soluble phosphate. The optimal particle size and pulp density were 150 μm and 1%, respectively. However, phosphate-solubilizing capacity of the mixed bacteria varied with the two different mineral compositions under the same condition. The correlation analyses show a significant positive correlation between biomass and phosphate content, while a negative correlation between pH and phosphate content.