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Electrocoagulation as an Effective Method to Reduce Microplastic Waste in Water
Summary
Scientists tested a water treatment method called electrocoagulation (using a mild electric current to clump and remove particles) to see if it could pull tiny plastic bits, called microplastics, out of tap water. At the best setting they tried, it removed 71% of microplastics, but other power levels barely worked at all, and the results weren't statistically reliable — meaning this method shows promise but isn't a proven fix yet. Since microplastics in drinking water are a growing health concern, this research is an early step toward finding better ways to filter them out before they reach your glass.
Microplastics are small plastic particles (<5 mm) that originate from two main sources: primary, such as microbes in cosmetics, and secondary, resulting from the degradation of large plastics through physical abrasion or photodegradation. Filtration is a common method for inhibiting the spread of microplastics, while electrocoagulation has not been widely used. This study aims to evaluate the effectiveness of electrocoagulation using aluminum electrodes in separating microplastics from tap water. The experiment was conducted in a 1 L beaker containing 100 pieces of plastic string as a source of microplastics, with varying voltages of 16, 20, 24, and 28 V and treatment times of 60 and 90 minutes. Based on the analysis results, the electrocoagulation method was able to separate microplastics from water up to 71% at 16 V for 75 minutes. However, at other voltage treatments (20 V, 24 V, and 28 V), the efficiency of microplastic separation was recorded as less than 15%. Statistical analysis using a factorial randomized design yielded p-values of 0.08 for the time factor, 0.19 for the voltage factor, and 0.39 for the interaction between the two, indicating no significant effect of any of the treatments. These findings indicate that while electrocoagulation has the potential to separate microplastics, its effectiveness is highly dependent on the appropriate combination of parameters.