不同诱导模式下CAST工艺的亚硝酸盐型反硝化除磷能力

发布时间：2019-06-20 21:47

【摘要】：实验采用改良型CAST工艺,考察了不同诱导模式下系统的除磷脱氮性能.结果表明,在缺氧条件下投加亚硝酸盐对系统反硝化除磷性能的抑制作用较大,投加量为5 mg·L~(-1)时系统除磷性能变差.相比较,好氧投加亚硝酸盐的CAST系统更稳定,当亚硝酸盐投加浓度为5、10、15 mg·L~(-1)时各工况初期除磷性能均有小幅波动,但分别经过10、6、34 d驯化后,除磷率迅速回升并稳定在95%以上,出水磷浓度均小于0.5 mg·L~(-1);投加量为20 mg·L~(-1)时工艺除磷性能急速恶化,但污泥的亚硝酸盐型缺氧吸磷能力是驯化前的10.4倍,说明投加一定浓度亚硝酸盐导致的除磷性能恶化可以解除,且长期投加有利于富集以NO_2~-为电子受体的反硝化聚磷菌.实验还发现,好氧投加一定浓度亚硝酸盐系统污泥沉降性能良好且污泥浓度不断降低,这对污泥减量具有一定指导意义.
[Abstract]:The phosphorus and nitrogen removal performance of the system under different induction modes was investigated by improved CAST process. The results showed that under anoxic condition, the phosphorus removal performance of denitrification system was greatly inhibited by adding nitrite, and the phosphorus removal performance of the system became worse when the dosage was 5 mg 路L ~ (- 1). Compared with the CAST system, the CAST system with aerobic addition of nitrite was more stable. When the concentration of nitrite was 5, 10, 15 mg 路L ~ (- 1), the phosphorus removal performance fluctuated slightly at the beginning of each working condition, but after 10 mg 路L ~ (- 1) acclimation for 34 days, the phosphorus removal rate increased rapidly and stabilized above 95%, and the phosphorus concentration in effluent was less than 0.5 mg 路L ~ (- 1). The phosphorus removal performance of the process deteriorated rapidly when the dosage was 20 mg 路L ~ (- 1), but the nitrate anoxic phosphorus absorption ability of sludge was 10.4 times as much as that before domestication, which indicated that the deterioration of phosphorus removal performance caused by adding a certain concentration of nitrate could be relieved, and long-term addition was beneficial to enrich denitrifying phosphorus accumulating bacteria with NO_2~- as electron receptor. It is also found that the sludge sedimentation performance is good and the sludge concentration is decreasing in the system of aerobic adding a certain concentration of nitrite, which has certain guiding significance for sludge reduction.
【作者单位】：兰州交通大学环境与市政工程学院;
【基金】：国家自然科学基金项目(51168027,51668033) 甘肃省大学生创新创业训练计划项目(201610732009)
【分类号】：X703

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