Effect of hydraulic retention time on the purification performance of natural-aeration biofilter
ZHU Wen-jun, YANG Yang*, QIAO Yong-min, TAO Ran, CHEN Ying-ting
1. Research Center of Hydrobiology, College of Life Science and Technology, Jinan University, Guangzhou 510632, China; 2. Engineering Research Center of Tropical and Subtropical Aquatic Ecological Engineering, Ministry of Education, Guangzhou 510632, China
Through the use of a natural aeration biofilter for the treatment of eutrophic water bodies, the effects of HRT on the remove efficiency of natural aeration biofilter and relevant remove mechanism were studied. The results showed that a higher removal efficiency of pollutants was found on the HRT of 9.6 min, and the remove loads of TN, NH4+-N, COD and Chl a were 1.08, 1.30, 3.36 and 26.02 g/m-2·d-1, respectively. With the decrease of HRT, the proportion of heterotrophic bacteria increased from 7.0% to 98.4%, but the proportion of autotrophic bacteria decreased from 93.0% to 1.6%. The biofilm and mycelium structure also increased with the decrease of HRT. In addition, an empirical formula between HRT and HLR was also achieved, which could provide theoretical reference for the design and operation of similar biofilter.
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