The public sewage (PS) and night soil mixed with johkasou sludge (JO) have similar chemical compositions; however. the concentrations of organic matter and nitrogen compounds were different. We investigated the microbial community of the rotating biological contactor (RBC) units treating PS and JO. in which the RBC was submerged in the mixed liquor of activated sludge. https://halohealthcarers.shop/product-category/walkers/