Environmental Science
4 years ago

Boosting wastewater treatment efficiency with longer retention times in activated sludge

Study of Performance of Completely Mixed Activated Sludge Process with Varying Hydraulic Retention Time (HRT) and Solid Retention Time (SRT) Using Lab-scale Plant
Bijay Thapa, Nawa Raj Khatiwada, Anish Ghimire, Bikash Adhikari, Rabin Malla

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Shorter retention time boosts organic and nutrient removal in wastewater treatment.

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The study looked at how changing the time wastewater stays in a treatment plant affects its performance. By using a small-scale plant, they found that longer times led to better removal of pollutants like COD and TKN. For example, with a longer time in the plant, COD removal increased from 12.9% to 88.4%, and TKN removal increased from 10.8% to 72.1%. This shows that increasing the time wastewater spends in the treatment plant improves its cleaning efficiency.