西安建筑科技大学学报(自然科学版)

以西安市某再生水厂出水为水源,通过模拟景观水体中藻生物膜的生长,探索水体固相介质接触面藻生物膜的滋生、时空变化及组成特征.试验结果表明,不同时间和不同位置藻生物膜中的藻数量、藻种分布及物质组成存在明显差异.单位面积藻生物膜中的碳氮磷含量、藻数量、EPS含量及铁锰含量随时间逐渐增加,在试验运行第65天时达到最大值,然后随脱落降低; 试验过程中,中层藻生物膜中的TCOD、TN和TP的平均含量、藻数量、EPS含量均明显高于上层和下层的对应值,藻生物膜的这种层间差异可能主要与光照有关.总之,粘附于固相介质表面的藻生物膜,可吸收利用再生水中的营养物、吸附富集再生水中的铁锰等金属离子,一定程度上可缓解再生水补给的景观水体富营养化和重金属污染问题,但需通过主动控制的方式以避免其引起水体景观效应降低的负面影响.

This study explored the growth, temporal and spatial variation and composition characteristics of algae biofilm on the surface of solid medium formed in a simulated landscape water supplied with reclaimed water. Results showed that an obvious difference existed in the algae number, algae species distribution and the composition in the algae biofilm at different time and location. The number of algae, EPS content, carbon, nitrogen, phosphorus content, iron and manganese content in the algae biofilm of per unit area increased gradually with time to the maximum value on the 65th day, and then decreased due to sloughing. In addition, during the experiment, the average content of TCOD, TN and TP, algae number and EPS in the algae biofilm of the middle layer was significantly higher than that in the upper layer and lower layer, which may be attributed to illumination factor. In brief, the algae biofilm formed in the landscape water can absorb and enrich the nutrients and some heavy metals from the reclaimed water, which may alleviate the eutrophication and heavy metal pollution when the landscape water was supplied with the reclaimed water to a certain extent. However, some proactive measures should be taken to control the negative effect to landscape of algae biofilm when the reclaimed water is adopted.

引言
1 材料与方法
2 结果
3 讨论
4 结论

表1 试验期间补给水源(再生水)水质<br/>Tab.1 Water quality parameters of the simulated landscape water during the experiment

表1 试验期间补给水源(再生水)水质
Tab.1 Water quality parameters of the simulated landscape water during the experiment

图1 单位面积藻生物膜量历时变化及其碳氮磷含量时空变化<br/>Fig.1 Time course of algae biofilm biomass and spatio-temporal variations of carbon, nitrogen and phosphorus content in per unit area

图1 单位面积藻生物膜量历时变化及其碳氮磷含量时空变化
Fig.1 Time course of algae biofilm biomass and spatio-temporal variations of carbon, nitrogen and phosphorus content in per unit area

图2 藻生物膜中藻种类、数量及藻密度历时变化<br/>Fig.2 Time course of algae species, number and density in algae biofilm

图2 藻生物膜中藻种类、数量及藻密度历时变化
Fig.2 Time course of algae species, number and density in algae biofilm

图3 单位面积藻生物膜EPS的历时变化及其不同组分的时空变化<br/>Fig.3 Time course of EPS in algae biofilm in per unit area and the temporal and spatial variations of its components

图3 单位面积藻生物膜EPS的历时变化及其不同组分的时空变化
Fig.3 Time course of EPS in algae biofilm in per unit area and the temporal and spatial variations of its components

图4 不同位置单位面积藻生物膜中铁锰历时变化<br/>Fig.4 Time course of iron and manganese in algae biofilm of per unit area at different locations

图4 不同位置单位面积藻生物膜中铁锰历时变化
Fig.4 Time course of iron and manganese in algae biofilm of per unit area at different locations

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备注

引言

1 材料与方法

2 结果

3 讨论

4 结论

期刊信息