Industry cases - Municipal water supply

—— Fluctuations and risks behind flowing water bodies, the first line of defense for industrial and civil water supply

Surface water is the most widely used type of water resource, widely used in urban water supply, industrial water use and agricultural irrigation. However, with the intensification of human activities, the problem of surface water pollution has become increasingly complicated, with strong water quality volatility, diverse causes of pollution, and increased difficulty in treatment. To ensure its safety and stability as a water supply source, it is necessary to rely on systematic governance and highly adapted water treatment technologies.
Typical water quality characteristics of surface water:
Various sources of pollution and large fluctuations: Surface water is affected by industrial emissions, agricultural runoff, domestic sewage, etc., and the seasonal and regional differences in water quality are significant, posing a challenge to system stability.
Turbidity and algae problems are prominent: turbidity can be as high as 100–500 NTU during rainfall or algal blooms, and the proliferation of blue algae and green algae can easily cause odors and toxic byproducts, seriously affecting the quality of the effluent.
High content of organic matter and microorganisms: COD is mostly 20–80 mg/L, BOD₅ is 5–20 mg/L, and total coliform bacteria is often above 10,000–50,000 CFU/L, with obvious biological contamination risks.
Increased problems of heavy metal and pesticide residues: In some river basins, arsenic, lead, mercury and chlorinated organic matter can be detected in surface water, requiring special deep treatment.
Restricted by water source protection area policies: Most surface water sources are strictly regulated by laws and regulations, which puts higher requirements on the drainage stability and water quality traceability of the treatment system.