Removal of algae by silver carp combined with conventional drinking water treatment processes
鲢鱼联合常规水处理工艺除藻特性

Silver carp were introduced into the pre-sedimentation tank in a water plant with the aim to remove algae. The algal species and amount in the samples from the raw water and the main treatment processes were determined. The results showed that Microcystis flos-aquae could be removed effectively by silver carp, but single cell green algae could not be effectively filtered and digested, so single cell green algae had greater growth potential while the amount and proportion of Microcystis flos-aquae decreased in the pre-sedimentation tank. Chlorophyll a was observably oxidized by chlorine in the prechlorination step. The rodshaped algae were effectively removed in coagulation and sedimentation processes while algae with many prominences hindered the effectiveness of the coagulation and sedimentation processes. A small quantity of algae of smaller size or with spiny prominences could penetrate the filtering layers. When Microcystis was the dominant species in raw water, algae could be well removed by silver carp combined with conventional drinking water treatment processes.