During the critical period of "seven downs and eight ups" flood control, Dalian suffered from complicated weather intertwined with high temperature and heavy rain, and the water quality safety faced multiple tests. It was learned from the Municipal Water Affairs Group that in the face of the main risks and challenges in the flood season, the group acted quickly to build a full-chain guarantee system from the "source" to the "leader" and build a water quality safety barrier in the flood season.

In the source prevention and control link, precise policies are implemented to reduce external input. Complete the investigation of pollution sources in the Biliu River and Yingna River reservoir basins to provide scientific basis for treatment. Before the flood season, 883 people were organized to carry out large-scale warehouse clearance and 1,103 cubic meters of garbage were cleaned up, effectively reducing the risk of endogenous pollution. In terms of monitoring and early warning, we weave a dense sensing network. A full-chain monitoring network of "water source-storage river-water plant" has been built, with a total of 26 new monitoring points added. Since June, the detection frequency of key indicators at water intakes has been encrypted to once a week, dynamically capturing changes in algae, turbidity, manganese and other indicators.

In view of the risk of algal bloom, we will play a "combination boxing" of scientific governance. By strengthening biological regulation and emergency treatment with professional cyanobacteria salvage teams; Use rainwater resources to discharge high algae water on the surface, build a 1,500-square-meter ecological floating bed, and install a water pumping aeration device at the water intake to inhibit algae growth; The water plant has added powdered activated carbon and new chemical dosing equipment to enhance the removal effect of odor and color. In addition, through the compilation of the Technical Report on Reservoir Sediment Survey, full-chain measures such as delineating protected areas at water intakes, adding water pumping aeration devices, and activating potassium permanganate delivery devices in water plants, we can effectively deal with the manganese content that may be caused by heavy rainfall exceeds the standard. Faced with high turbidity, each water plant intensively monitored, accurately adjusted the dosage of coagulants, coagulants, etc., and increased the frequency of sludge discharge from sedimentation tanks to ensure water quality. The Municipal Water Group makes every effort to ensure the safety of citizens' drinking water through the whole chain water quality safety guarantee system.