For that sewage sludge through the sewage treatment plant, the commonest sludge involves Key and secondary sludge, where the main sludge is the sludge collected from the main clarifier, plus the secondary sludge will be the surplus-activated sludge (Nielsen and Stefanakis 2020). As to the onsite sanitation system, the sludge https://finebubblediffuser82468.blog-eye.com/28895982/the-smart-trick-of-rotating-disc-filters-that-no-one-is-discussing