鞘藻对沼液中磷的去除机理分析

利用微藻对沼液进行二级处理是一类绿色经济的废水处理方式，具有可观的应用前景。研究测定了鞘藻在处理沼液过程中藻的生长速度、DO和pH变化，并通过同位素示踪法分析了沼液中磷素的去除速率及其途径。结果表明:鞘藻在沼液中Chl-a浓度达到3.35 mg/L，是初始浓度的3.13倍，TP去除率为91.22%。TP去除机理分析表明:沼液中残留的微生物对TP的去除影响小；沼液处于好氧状态，很难形成气态PH₃进入大气；碱性条件下，且存在Ca2+、Mg2+等阳离子的协同作用，约30%的TP通过磷酸盐沉淀去除，约60%的TP通过鞘藻同化去除。综合来看，TP浓度的降低主要是通过鞘藻的生长吸收和磷酸盐沉淀所致，要进一步提高TP的去除率，应降低DO值并保持适宜的N/P。

MECHANISM OF PHOSPHORUS REMOVAL FROM BIOGAS SLURRY BY OEDOGONIUM SP.

It is a kind of green economy wastewater treatment method to use the optimized microalgae for secondary treatment of swine wastewater, which has considerable application prospect. Combining isotope tracer method and path analysis, the phosphorus metabolic and mechanism analysis in biogas slurry by Oedogonium sp. were studied, in order to provide theoretical basis for practical application of Oedogonium sp. in digested wastewater treatment. During the experiment, Chl-a content in the biogas slurry reached 3.35 mg/L, 3.13 times of the initial content, and the TP removal rate was 91.22%. The analysis of TP removal mechanism showed that the microbial residues in the wastewater had little influence on TP removal. It was difficult to form gaseous phosphine from biogas slurry into the atmosphere under aerobic state. About 30% of TP was removed by phosphate precipitation under alkaline condition with the synergistic effect of cation such as Ca2+ and Mg2+. TP decrease was mainly caused by the algal incorporation and phosphate precipitation. About 60% of TP was removed by microalgae assimilation. The DO value should be reduced and the N/P ratio should be maintained for further improving TP removal rate.