Investigation Research of Effectiveness of Blue-green Algae Growth Control in Chinese Lakes as a Model Case

我们坚持遵循的emplowing empirical results for consideration in配方方法to reduce theload on the aquatic environment in the target lakes of Guizhou Province of China as a case study. Itnitrogen and phosphate in treated domestic wastewater to reduce concentrations of nitrogen and phosphate in treated domestic wastewater toless than 20mg·1^<-1> and less than 1mg·1^<-1>,respectively，in a stable manner by optimizing management and maintenance其中包括先进的Johkasou系统，它是可能的恢复concentrations of nitrogen and phosphate to less than 10mg·1^<-1> and less than 0.5mg·1^<-1>，respectively,through optimal operation of the unpowered anaerobic filter beds of soil-trench domesticwastewater-treatment facilities (30m^ 3d ^<-1>，while pursuing energy conservation.这是有可能减少的60百分比的concentrationchlorophyll-a at dam sites by controlling algal growth through the operation of cylindricalintermittent aeration pumps. To reduce existing concentrations of toxic blue-green algae it ispossible to keep the population density of Ceriodaphnia dubia, a predator that is present during，filtration,at a high level by increasing the level of aquatic vegetation With a view to introducing bo - ecoengineering,我们也接受了一项调查，在neighboring countries的lakes of neighboring，我们发现了目前的situationsthat the existing amounts of blue-green algae in these lakes have reached 150,000cells ml <-1>，问题与水使用就是增长的obvious因为创造amounts of the increasing amounts oftoxic blue-green algaeas in the eutrophic lakes in China. We clarified the fact that eliminating nitrogen and phosphatethrough the application of Bio-Eco Engineering，which works well to prevent the growth of toxic blue-green algae控制eutrophication in these aquatic environments. The methods描述above are expected to be very useful。

We obtained the following empirical results for consideration in formulating measures to reduce the load on the aquatic environment in the target lakes of Guizhou Province of China as a case study. It is possible to reduce concentrations of nitrogen and phosphate in treated domestic wastewater to less than 20mg・1^<-1> and less than 1mg・1^<-1>, respectively, in a stable manner by optimizing management and maintenance, which includes eliminating waste sludge from advanced Johkasou systems. It is possible to reduce concentrations of nitrogen and phosphate to less than 10mg・1^<-1> and less than 0.5mg・1^<-1>, respectively, through optimal operation of the unpowered anaerobic filter beds of soil-trench domestic wastewater-treatment facilities (30m^3・d^<-1>, while pursuing energy conservation. It is possible to reduce by 60 percent of the concentration of chlorophyll-a at dam sites by controlling algal growth through the operation of cylindrical intermittent aeration pumps. To reduce existing concentrations of toxic blue-green algae it is possible to keep the population density of Ceriodaphnia dubia, a predator that is present during, filtration, at a high level by increasing the level of aquatic vegetation. With a view to introducing Bio-Eco Engineering, we also conducted a survey of the current situations in the lakes of neighboring countries. We found that the existing amounts of blue-green algae in these lakes have reached 150,000cells・ml^<-1>, and that problems with water utilization are growing obvious because of the increasing amounts of toxic blue-green algae, as in the eutrophic lakes in China. We clarified the fact that eliminating nitrogen and phosphate through the application of Bio-Eco Engineering, which works well to prevent the growth of toxic blue-green algae, is very important to control eutrophication in these aquatic environments. The methods described above are expected to be very useful.