Effect of Fe/B on the simultaneous removal efficiency of nitrogen and phosphorus by bamboo-based coupled system
A bamboo-based coupled system was constructed using iron shavings and bamboo fibers to enhance the simultaneous removal of nitrogen and phosphorus from wastewater with low carbon to nitrogen ratio(C/N).A continuous flow device was used to construct five sets of coupled systems with different iron shavings/bamboo fiber mass ratios(Fe/B).The effect of Fe/B on the nitrogen and phosphorus removal efficiency of the bamboo-based coupled system was investigated.The coupled system was operated continuously for 113 d under the average TN of 31.32 mg/L,average C/N of 1.16,average TP of 2.02 mg/L,and the hydraulic retention time(HRT)reduced from 16 h to 8 h.The results showed that when Fe/B≤0.500,the nitrogen and phosphorus removal efficiency was positively correlated with Fe/B;when Fe/B was 0.500,the nitrogen and phosphorus removal efficiency was the highest,and the effluent TN and TP could reach the standard of class Ⅳ of"Quality standards for surface water"(GB 3838-2002);when Fe/B＞0.500,the nitrogen and phosphorus removal efficiency was slightly reduced;the total iron in the effluent of the coupled system was low overall,and the fluctuation of the total iron was the largest when Fe/B was 0.250;when Fe/B≤0.500,iron shavings could significantly promote the growth of nitrogen and phosphorus removal functional bacteria,including denitrifying phosphorus-removing bacteria;when Fe/B＞0.500,the relative abundance of functional bacteria for nitrogen and phosphorus removal decreased significantly,and the structure of bacterial colony also changed significantly.
simultaneous removal of nitrogen and phosphorusiron shavingsbamboo-based coupled systemdenitrifying phosphorus-removing bacteria
NETL
NSTL
万方数据
