Some Issues by Algae on Water Supply in Tropical Country

水源水质原水浊度始终大于50 NTU，雨季浊度大于150 NTU。原水的平均浊度约为80 NTU。原水的pH值为7.3 ~ 7.7。9月原水电导率最低，为200亩s/cm， 2月最高，为350亩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。都市区水源朝溪河的优势藻类有Cyclotella sp.、Melosira sp.、Diatom、Oscillatoria sp.、Euglena sp.、Chiorella sp.、clotiiopsis sp.、Clasteriom sp.和Scenedesmus sp.。藻类细胞总数平均每100毫升最多可达数千个。超过总数70%的藻类是影响过滤器堵塞的种类。因此，过滤器堵塞问题立即成为实际问题也就不足为奇了。藻类的可处理性：对藻类的去除率平均在60%左右，有时甚至低于40%，尽管有很高的去除率，浊度达到98%。预计在分配和服务管道中会出现一些问题。在泰国的Payao湖，面积为18 km^2，平均深度为1.8 m，尽管藻类的存在影响问题的同时不会发生阻碍，但至少所有由藻类引起的问题都会在未来发生。现在泰国人已经没有直接饮用自来水的习惯了。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。混凝堵塞和砂滤堵塞与水处理工艺和系统有着密切的关系。在泰国的河流和湖泊等水源中，观察到与藻类引起的一些问题密切相关的种类。泰国的自来水厂将会出现严重的问题。为了维护水源水质，也为了更好地运行净水工艺和系统，应继续对泰国的藻类进行检测。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