炼油废水对凤眼莲根系微型动物种类、数量和生物量的影响

用凤眼莲净化炼油废水,其根系的生物种类很丰富,成为一个亚生态系统,其中微型动物有20种,轮虫3种,线虫、枝角类等4种.优势种群为沟钟虫、转轮虫和盘状鞍甲轮虫,它们各占总量的18.5％、17.5％和34.5％.炼油废水在氧化塘中滞留期越长,根系微型动物种类和数量越多.从废水的进口到出口凤眼莲根系微型动物总的数最呈增加趋势,最高数量为1.91×10~7个/m~2.对照塘除具有自氧作用的裸藻外,水体中几乎无微型动物.废水滞留期的延长对进、出口凤眼莲根系上好氧和兼性好氧微生物数量的影响不大.

Influence of Wastewater from Oil Refinery on Species and Biomass of Microzoon in Rootzone of Waterhyacinth

There are lots of biological species in rootzone of waterhyacinth, which can purify wastewater from oil refinery. Rootzone of waterhyacinth is an ecological subsystem. There are 20 microzoon species including 13 protozoa, 3 rotifer and 4 others. The main species are Vorlicella convallaria, Rotaria rotatoria and Lepadella patella with precentages of 18.5%, 17.5% and 34.5%, respectively. The longer retention time of the wastewater is in the oxidation pond, the more species and the bigger population of microzoon in rootzone of waterhyacinth. The total biomass increases along with wastewater flow. The maximum value of the population is 1.91×10⁷ ind /m². There is no microzoon except Englena which is an autotrophic organism in control pond. Increase of retention time of wastewater is beneficial to biomass of microzoon and has no effect on the content of aerobic and facultative aerobic microbes in oxidation pond.