A new mixing–oxygenating technology for water quality improvement of urban water source and its implication in a reservoir

Effects of rainfall patterns on water quality in a stratified reservoir subject to eutrophication: Implications for management

“…A waterlifting aerator was installed at S1 in 2012 to improve the water quality. The WLA can increase the concentration of DO in the hypolimnion by two methods: by directly oxygenating the lower water layer with the aid of the aeration chamber and by weakening the stratification by mixing the lower and upper layers of water, thus increasing the DO concentration in the lower-layer water (Cong et al, 2009). The WLA operation began on September 17, 2012.…”

“…This cycle perpetuated the mixing of the upper and lower water layers and led to a gradual increase in the water temperature in the hypolimnion, which weakened the stratification and induced early mixing in the autumn (Huang et al, 2014c). The mixing function of the WLAs could also prevent the reverse thermal stratification in winter by preventing the freezing of the surface water around the WLAs (Cong et al, 2009). The WLAs were primarily used in the summer stratified reservoir o destroy water stratification, increase the dissolved oxygen in the lower water layer, inhibit the release of pollutants from the bottom sediments, and restrain algal growth, thus improving water quality.…”

Abundance and diversity of sulfate-reducing bacteria in the sediment of the Zhou Cun drinking water reservoir in Eastern China

“…The RDA results might provide insights on how to control the SRB abundance and improve the water quality of the Zhou Cun drinking water reservoir. Comparatively, waterlifting and aeration technology for in situ restoration of water quality has been applied successfully to a reservoir in northern China (Cong et al, 2009). Under the mixing and aeration conditions used, the thermal stratification structure was disturbed and the concentration of dissolved oxygen (DO) was raised by 2-3 mg/L, which led to a reduced release of ammonia-N and P from the sediments into the water.…”

Study of the application of the water-lifting aerators to improve the water quality of a stratified, eutrophicated reservoir

“…In this research, two water-lifting aerators (WLAs) made of fiber reinforced polypropylene (FRPP) were installed in a stratified eutrophicated reservoir to improve the water quality. The WLA is a new type of artificial mixing equipment that has two major functions: mixing the lower and the upper water layers and directly oxygenating the lower water layer (Cong et al, 2010(Cong et al, , 2011(Cong et al, , 2009. We aimed to investigate the mixing and oxygenation capacity of this technique for controlling the algae bloom and the release of internal pollutants as well as the broader impacts on reservoir water quality.…”