环境因子对红胞藻JZB-2降解海水中对二甲苯的影响

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Abstract In previous study, Rhodomonas sp. JZB-2, a Cryptophyta microalga, was isolated and tested to be capable of rapid biodegradation of PX in seawater. In order to optimize the suitable conditions for this alga used for the bioremediation of PX in contaminated sea areas, the effects of four environmental factors (seawater pH, temperature, salinity and light intensity) on the microalgal growth and the efficiency of PX degradation were studied. The results showed that each factor significantly affected the microalgal growth and PX degradation. The microalga grew fastest at pH between 7.0 and 8.5, but the highest degradation ratio occurred at pH 7.0. This microalga could growth well at salinity ranging from 14 to 35, and the maximum value of PX degradation rate appeared at the salinity of 35. A range of temperature from 20 to 30℃ was suitable for the microalgal growth, and the degradation ratio of PX peaked at 30℃. A special effect tendency was found for the light intensity. This microalga grew fast under the light intensity of 200~400μmol/(m²·s), however, the maximum degradation rate of PX occurred at 800 μmol/(m²·s). Interestingly, the microalga could not grow under dark condition but still degraded PX rapidly, which was beneficial to its usage in the spill accident sea area on rainy days or at night. This study provided a basis for the rational usage of JZB-2 to degrade PX in the contaminated sea areas.

Key words： environmental factors microalgae seawater para-xylene (PX) biodegradation

Received: 15 June 2022

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X55

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	YAO Yu
	LI Hao
	MENG Fan-ping

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YAO Yu,LI Hao,MENG Fan-ping. Effects of environmental factors on the degradation of paraxylene in seawater by Rhodomonas sp. JZB-2[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 181-189.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/181

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