The efficient fixation of microorganisms on the surface of the carrier is an effective way to improve microbial abundance and reduce sludge yield in the water treatment system. This article commence from the immobilized carrier type, advantages and disadvantages of the soil carriers, the natural mineral carriers, industrial by-product carriers and their replicates. Traditional polymer material carriers as well as new polymer material carriers were introduced. The characteristics of various carriers in wastewater biological treatment and their effects on microbial selectivity and bioactivity we...
