不同营养水平下悬浮细菌数量对生物粘泥性质的影响

Impact of suspended bacteria on properties of biofouling at different nutrient levels

循环水系统中的微生物有悬浮态和附着态,悬浮细菌的存在对附着态生物粘泥的生长及特性有明显影响。通过向模拟循环冷却水系统中投加不同数量初始悬浮细菌,考察在营养水平不同的情况下,悬浮细菌数量对生物粘泥化学组成和脱氢酶活性的影响。结果表明,营养水平不同,初始悬浮细菌数量对生物粘泥的化学组成和脱氢酶活性的影响程度不同;在不同营养水平下,应分别控制初始悬浮细菌数量。贫营养下,初始悬浮细菌数量应控制在6×105个/mL左右;中营养下,初始悬浮细菌数量应控制在1×105～2.6×105个/mL之间;富营养下,初始悬浮细菌数量应控制在0.11×105～2.6×105个/mL之间最不利于生物粘泥的生长。

The concentration of suspended bacteria can affect the development of attached biofouling in circulating cooling water system.Through a series of single factor experiments,the influences of suspended bacteria on biofouling composition and dehydrogenase activity were investigated at different nutrient levels.Different variation trends of the biofouling characteristics were observed with the increases of suspended bacteria concentrations,respectively.The results showed that the biofouling contents were reduced to the lowest level with suspended bacteria concentration of 6×105cfu/mL at poor nutrition,1×105 cfu / mL to 2.6×105 cfu/mL at middling nutrition and 0.11×105 cfu/ mL to 2.6×105 cfu/mL at eutrophic nutrition.