活性炭池中桡足类浮游动物滋生的影响因素

Influencing Factors for Excess Propagation of Copepod Zooplankton in an Activated Carbon Filter

以水温、光照条件等环境因素对桡足类的摄食行为和作用关系进行研究.结果表明,10～30℃时,桡足类浮游动物的清滤率和滤食率均保持在较高的水平,宽广的摄食温度范围有利于其在活性炭池中滋生繁殖;在全黑暗和光照周期12 h、光照强度700 lx条件下,桡足类的摄食强度出现高峰,而光强升高则会抑制水蚤的摄食行为;活性炭池中炭附细菌对桡足类饵料的贡献率超过自由细菌5倍以上,水蚤的摄食主要集中在小于10μm的粒径范围,占饵料总量的90%以上.控制活性炭池的光照条件和改善进水水质降低炭层中的微生物水平,均有利于抑制水蚤类浮游动物的滋生.

The excess propagation of Copepod zooplankton in an activated carbon （GAC） filter causes potential danger to the drinking water security. The feeding activity of Copepod is analyzed by investigating influencing factors including water temperature and light intensity in the GAC filter. Experimental results show that the filtering and grazing rates remain high in Copepod feeding when the water temperature is 10 -30 ~C. The abroad range of the feeding temperature is in favor of the excess propagation of Copepods in the GAC filter. The maximum feeding rate of Copepods occurs under the conditions such as complete dark or light intensity of 700 lx and light period of 12 h. The increasing light intensity has a negative influence on the feeding activity of Copepods. The number of bacteria attached to GAC particles is five times higher than that of free bacteria in Copepod food composition. The size of food is mainly less than 10 p^m, accounting for 90% of total food. It is feasible to control the excess propagation of Copepods by optimizing the light condition and improving the influent water quality to reduce the number of bacteria in the GAC filter.