Some Issues by Algae on Water Supply in Tropical Country

水源水质原水浊度通常高于50 NTU，雨季超过150 NTU。原水的平均浊度为80 NTU左右，原水的pH值为7.3 ~ 7.7。9月份原水电导率最低，为200 μ s/cm; 2月份原水电导率最高，为350 μ s/cm。平均电导率为270 μ s/cm，含有较厚的可溶性物质。河流中的藻类作为大都市地区水源的湄南河中藻类的优势种是小环藻属，直链藻，硅藻，颤藻属，裸藻，小球藻属，Clotieriopsis sp.，和栅藻属Scenedesmus sp.每100 ml藻细胞最多可达数千个。藻类种类占总藻类的70%以上，是影响过滤器堵塞的种类.因此，毫不奇怪，过滤器堵塞问题立即成为实际问题。藻类的可处理性藻类的去除率约为60% 关于我们 平均而言，尽管对浊度的去除率达到98%，但有时低于40%。在面积为18 km^2、平均深度为1.8 m的泰国帕瑶湖中，至少所有由藻类引起的问题都将在未来发生，尽管影响问题的藻类的存在并不意味着同时发生阻塞。现在泰国人没有直接饮用自来水的习惯。自来水中的气味、有毒物质、可溶性铝和THM问题可能与泰国人民和自来水厂无关。然而，混凝堵塞和砂滤器堵塞与水处理工艺和系统有着深刻的关系，在泰国的河流和湖泊等水源中，观察到了与藻类引起的一些问题密切相关的种类。泰国自来水厂将出现严重问题。泰国的藻类检测工作应该继续下去，这不仅是为了保持水源的水质，也是为了更好地运行净水工艺和系统。少

Water Quality of Water SourceRaw water turbidity is always higher than 50 NTU and is over than 150 NTU in rainy season. Average turbidity of raw water is around 80 NTU.The pH values of raw water are 7.3 to 7.7. The conductivity of raw water in September is the lowest, 200 mu s/cm and is the highest, 350 mu s/cm in February. The average conductivity is 270 mu s/cm and the thick soluble matter is contained.Algae in RiverThe predominant species of the kind of algae in Chao Phya river as water source for metropolitan area are Cyclotella sp., Melosira sp., Diatom, Oscillatoria sp., Euglena sp., Chiorella sp., Clotieriopsis sp., Clasteriom sp. and Scenedesmus sp.. The total cell number of algae is thousands on average per 100 ml on maximum number. The species over the 70 % of total algae is the kind of affecting the filter clogging. It, therefore, comes as no surprise that the filter clogging problem becomes actual issue at once.Treatability of AlgaeThe removal rate for algae is around 60 % … More on average and is sometimes lower than 40 % in spite of getting high removal rate, 98 % for turbidity. It will be estimated to occur the some issues in distribution and service pipelines.Algae in LakesIn Payao lake, which has 18 km^2 in area and 1.8 m in average depth, in Thailand, at least all problems caused by algae will be occurred in the future though the existence of algae which affect the problem does not the occurrence of obstruction on same time. Now Thai people have no usage to drink tap water directly. Odour, toxic substances, soluble aluminium and THM problem in tap water may be no relation for Thai people and waterworks. However, coagulation blocking and sand filter clogging is deeply related to water treatment process and system.In the water source such as river and lake in Thailand, the kind of species closely related to some issues caused by algae are observed. It will be occurred serious problem on waterworks in Thailand. The examination of algae in Thailand should be continued for not only the maintenance of water quality of water source but also for better operation of water purification process and system. Less