水力停留时间对自然曝气生物滤床净化效能的影响

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Abstract

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.

Key words： hydraulic retention time natural aeration biofilter biofilm

Received: 25 April 2013

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	Articles by authors
	ZHU Wen-jun
	YANG Yang
	QIAO Yong-min
	TAO Ran
	CHEN Ying-ting

Cite this article:

ZHU Wen-jun,YANG Yang,QIAO Yong-min, et al. Effect of hydraulic retention time on the purification performance of natural-aeration biofilter[J]. , 2013, 32(2): 224-229.

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http://www.ecolsci.com/EN/ OR http://www.ecolsci.com/EN/Y2013/V32/I2/224

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