生物载体内孔径对生物膜微型动物多样性与稳定性影响

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Abstract In order to provide the basis for the selection of biological carrier with the best pore size in wastewater treatment production, polyurethane sponges with five kinds of inner-pore diameter (0.6~4.0mm) were used as the biological carriers in this study. The effects of the inner-pore diameter on the species diversity and stability of microfauna were systematically investigated. The results showed that flagellates, sarcodina etc., were the dominant species in the intial and middle periods of reactor operation. Whereas, the swimming and sessile ciliates and rotifers mainly occurred in the later stage. Diversity, stability and other parameters of microfauna in different carrier pore sizes exhibited significantly divergence at three distinct periods. The microfauna in the carrier with small pore size (0.6mm) showed high diversity only during the middle period of reactor operation, while the diversity of microfauna in the carriers of 1.0mm diameter was generally lower. However, the diversity of microfauna in the carriers with larger (3.0mm) and big pore size (4.0mm) fluctuated dramatically during the whole process. The stability of microfauna in the carriers with small (0.6mm) and small-moderate pore size (1.0mm) were superior to the carriers with larger pore in the middle and later periods of reactor operation, but worse in the intial periods of reactor operation. Notably, the stability of big pore bio-carrier (4.0mm)was the most undesirable throughout the reactor process. Compared to other size of bio-carriers, the microfauna community in the bio-carrier with moderate pore (2.0mm) possessed higher species richness and uniformity, resulting in a high and stable diversity (H=2.12, R=1.19, λ=0.16 in the later period). In addition, microfauna community on the moderate-pore bio-carrier emerged the strongest stability (W_H=0.13 in later period) with an excellent efficiency of wastewater treatment. In the biofilm system, the stability index W_H can be used as the index parameter of CODc_r removal efficiency.

Key words： inner-pore diameter microfauna community diversity stability

Received: 04 April 2021

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	Articles by authors
	HU Xiao-bing
	WANG Zhen-zhen
	LIN Rui
	SHEN Yi-jun
	ZHONG Mei-ying
	LI Jing-jing
	CHEN Hong-wei
	ZHOU Jia-ying

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HU Xiao-bing,WANG Zhen-zhen,LIN Rui等. Effect of inner-pore diameter of bio-carrier on community diversity and stability of microfauna in biofilm[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5292-5302.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5292

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