Influence of treated wastewater reuse on variation of chlorophyll-a in community landscape water body

Treated wastewater provides potential water source for landscape water bodies in a community. However, these water bodies are at risk for developing algal blooms because of high nutrient levels of treated wastewater. Based on the data from water exchange experiment in an artificial landscape water body supplemented by treated wastewater, a eutrophication model was calibrated and validated. The model was furthermore applied to simulate chlorophyll-a variation in landscape water body during the period with continuous water exchange (period-1) and when water exchange was consequently suspended (period-2). Effects of treated wastewater quality and water exchange cycle on algae growth were analyzed. The results indicate that: improvement of treated wastewater quality may reduce the peak concentration of chlorophyll-a; in period-1, the shorter water exchange cycle period is, the lower peak concentration of chlorophyll-a the water body has, and the longer time it needs to reach the peak; in period-2, the concentrations of chlorophyll-a will reach peak again, however, the shorter water exchange cycle in period-1 is, the higher chlorophyll-a peak concentration the water body has, and the longer time it needs to reach the peak. The application of the model can provide support for design and daily maintenance of community landscape water body supplemented by treated wastewater