lisäpaintuminen

Lisäpaintuminen refers to the process of secondary sedimentation in water treatment. It follows the primary sedimentation stage, where larger suspended solids are removed. Lisäpaintuminen aims to further reduce the concentration of finer suspended particles that may have escaped the initial sedimentation. This stage is crucial for improving the clarity and quality of the water before it undergoes further treatment processes such as filtration or disinfection.

In lisäpaintuminen, water flows through a sedimentation tank, similar to primary sedimentation, but often designed to optimize the settling of smaller particles. Factors like longer retention times and specific tank geometries can enhance the effectiveness of this secondary settling process. The suspended solids that settle out during lisäpaintuminen form a sludge, which is then removed for further processing. This sludge typically contains a higher proportion of organic matter compared to the sludge from primary sedimentation.

The efficiency of lisäpaintuminen is influenced by various parameters including water flow rate, temperature, and the physical and chemical characteristics of the suspended solids. Sometimes, chemical coagulants or flocculants are added to promote the aggregation of fine particles into larger, more easily settleable flocs. This chemical assistance significantly improves the performance of the secondary sedimentation stage. Lisäpaintuminen is an important step in many wastewater treatment plants and can also be applied in drinking water treatment to achieve higher levels of purification.