Sähkökoagulaatio

Sähkökoagulaatio, also known as electrocoagulation, is a water treatment process that uses electricity to remove contaminants from water. The process involves passing an electric current through the water, which causes metal electrodes, typically aluminum or iron, to corrode. These corroding electrodes release metal ions into the water, which then act as coagulants. These metal ions neutralize the negative charges of suspended particles, allowing them to aggregate into larger flocs. These flocs can then be more easily removed through sedimentation or filtration.

Electrocoagulation is effective in removing a wide range of contaminants, including suspended solids, heavy metals, oils, greases, and certain dissolved organic compounds. It is often used in industrial wastewater treatment, as well as in the treatment of drinking water. The process is known for its efficiency, relatively low operating costs, and its ability to handle fluctuating influent characteristics. It can also be effective in treating water with high salinity.

The equipment for electrocoagulation typically consists of an electrolytic cell containing sacrificial electrodes, a power supply, and a system for removing the treated water and settled sludge. The effectiveness of the process depends on several factors, including the type of electrodes used, current density, reaction time, and the initial characteristics of the water being treated. Compared to traditional chemical coagulation methods, electrocoagulation often produces less sludge and can be more environmentally friendly due to the avoidance of chemical additives.