Dokumen tersebut membahas berbagai metode pengolahan limbah cair secara biologis, mulai dari pengolahan primer (pengendapan), sekunder (aktivasi lumpur), hingga tersier (pengolahan lanjutan) menggunakan berbagai teknologi seperti kolam aktivasi, filter biologis, dan aplikasi lahan basah. Dokumen ini juga menjelaskan bahwa pengolahan limbah cair secara biologis bertujuan menghilangkan bahan organik terlar
32. Activated Sludge Mixed Liquor Air Secondary clarifier w/w Waste Activated Sludge (WAS) Return Activated Sludge (RAS) Treated w/w Discharge to River or Land Application
t d = approximately 6 - 8 hr Long rectangular aeration basins Air is injected near bottom of aeration tanks through system of diffusers Controlled by wasting a portion of microorganisms
Facultative zone: aerobic during day (photosynthesis occurs) anaerobic at night (respiration) Rely on wind action for reaeration wastewater enters from bottom