球形红杆菌磷耐受能力和除磷特性的研究

通过纯种培养试验,考察了废水生物除磷优势菌球形红杆菌的磷耐受能力和除磷特性。结果表明,球形红杆菌具有较强的磷耐受能力,且磷酸盐含量会对其除磷特性产生一定的影响。缺磷环境会使菌体产生过量摄磷现象;而在高磷环境下,菌体摄磷量的变化趋势与直接转入富磷培养类似:磷酸盐含量为1%时,菌体摄磷量基本未发生变化,当磷酸盐含量达到2%时,由于菌体的生长受到影响,摄磷量略有下降。结果还表明,球形红杆菌在微好氧培养过程中能达到与厌氧—微好氧培养过程相似的除磷效果,从而提示只要废水中存在足够的碳源,即使全部是微好氧过程,该菌也能有效地摄取磷酸盐而达到较好的除磷效果。由此可见,将球形红杆菌应用于高浓度含磷废水的实际处理工艺中前景看好。

Tolerance and Removal Characteristics of Rhodobacter Sphacroides Towards Phosphate

Tolerance and removal characteristics of Rhodobacter sphacroides towards phosphate were studied. The results indicated that the strain had better phosphate tolerance, and the removal characteristics were affected by level of phosphate. Phosphate was taken excessively from culture solution by the strain, which was induced by phosphate starvation culture; while cultured in phosphate-high-media, the strain took phosphate similar to removing to phosphate-sufficient-media. The phosphate uptake remained unchanged in 1%phosphate-high-media; but the phosphate uptake decreased in 2%phosphate-high-media because the growth of the strain was limited. The results also showed that the strain had same effects of phosphate removal in microaerophilic culture and anoxic-microaerophilic culture. It implied that if only carbon source was sufficient, the strain could took phosphate effectively even in microaerophilic culture. The results suggested that Rhodobacter sphacroides be applied to biological phosphate removal process.