Os sistemas de processo de lodos ativados (ASP) usam eletricidade para soprar ar em esgoto bruto e instável. Isso esmaga os sólidos para desenvolver uma "sopa" biológica. A aeração permite que as bactérias que ocorrem naturalmente nos resíduos digeram qualquer conteúdo orgânico, reduzindo o nível geral de poluentes. As estações de tratamento de esgoto ASP não têm uma câmara de assentamento primária, o que significa esvaziamento menos frequente e menos odores indesejados.
Once the sewage has been aerated for long enough, excess liquid is discharged into a clarification chamber, where live bacteria settle to the bottom. Dead bacteria rise to the top, leaving clean water in the middle – which can then be discharged safely into either a watercourse, drainage field or soakaway.
FILTROS DE AERAÇÃO SUBMERSOS
In a submerged aeration filter, a primary settlement chamber holds solid material. This is where anaerobic digestion by bacteria takes place. Clarified water then passes into a second chamber containing a submerged media – and here, the water is treated to remove dissolved constituents by aerobic bacteria, supported by diffused air. This process ensures that full treatment is achieved before the material flows to a final settlement chamber. The final, treated wastewater is discharged to the drainage field, watercourse or soakaway.