The role of itchy microorganisms in sewage treatment

At present, the method of aerobic microorganism treating sewage is activated sludge method. Complex microorganisms in activated sludge and organic nutrients in wastewater form a complex food chain. Heterobacteria and saprophytic fungi are the first to undertake the task of purification, and bacteria, especially spherical bacteria, play the most critical role. Activated sludge with excellent operation is a bacterial micelle composed of spherical bacteria with filamentous bacteria as the skeleton. With the normal operation of activated sludge, bacteria multiply and begin to grow protozoa, which are the primary predators of bacteria. Common protozoa in activated sludge are flagellates, meat caterpillars, ciliates and tube jellyfish. When activated sludge matures, fixed ciliates and species are dominant; Metazoa are secondary predators of bacteria, such as rotifers and nematodes, which only appear when dissolved oxygen is sufficient, so when metazoa appear, it shows that the water quality is improving.