NITROGEN CHANGES BY THE ALGAE AND BACTERIA IN THE FRESH WATER AND SEAWATER -EFFECT OF LIGHT INTENSITY ON NITROGEN CHANGES-

为了估计藻类与硝化细菌共存条件下水体自净研究中氮的变化，采用连续搅拌槽式反应器进行了室内实验。特别地，研究了光照强度对淡水和海水中硝化和/或同化的影响。NH_4Cl作为反应器的唯一氮源。将一组5个氯乙烯硬板制成的反应器放置在水套罐中，水套罐中温度保持在25℃。每个反应器的容积为5升，总面积为1341 cm^2。在每个反应器的壁上都安装了一些小的氯乙烯硬板来评估附着的生物质。反应器以100转/分的转速用小叶轮适度混合，反应器水面全天分别用10000勒克斯、5000勒克斯、2500勒克斯、900勒克斯和80勒克斯的荧光灯照射。各反应器的流型均为完全混合型流动特征。每次实际水力滞留时间为16小时。结论1。在淡水系统中，反应器pH值较低。随着海水比例的增加，反应器的pH值也随之升高。随着光强的增大，反应器的pH值也随之增大。2. 在淡水系统和海水系统中，SS、COD和叶绿素浓度均随光强的增加而增加，这是由于藻类的活性。3. 海藻和硝化细菌的活性在海水系统中高于淡水系统。

To estimate the changes of nitrogen for studies of self-purification of water under the coexistence of algae and nitrifying bacteria, laboratory experiments were carried out using a continuous stirred tank reacter. Particularly, the effect of light intensity on nitrification and/or assimilation was studied in fresh water and seawater. NH_4Cl was fed as the only source of nitrogen to the reacter. One sets of five reactors made of vinyl chloride hard plate were placed in a water jacket tank in which the temperature was maintained at 25ﾟC. The volume and total area of each reactor were 5 liters and 1341 cm^2, respectively. A number of small vinyl chloride hard plates were mounted on each reactor's wall to evaluate the attached biomass. The reactor was mixed moderately with a small impeller at 100 rpm and the water surface of the reactor was illuminated all day long with fluorescent lamps with 10000 lux, 5000 lux, 2500 lux, 900 lux and 80 lux, respectively, at the water surface. The flow pattern of each reactor was completemixing type flow characteristics. Each real hydraulic retention time was 16 hour.CONCLUSIONS 1. In the fresh water system, pH value of the reactors were low. pH value of the reactors become higher as the percentage of sea water higher. pH value of reactors become higher as the light intensity become higher. 2. In fresh water system and sea-water system, SS, COD and chlorophylla concentration increased as light intensity increased because of algae activity. 3. Activity of algae and nitrifying bacteria is greater in sea-water system than in fresh water system.