General Introduction The compact unit reactor adopts the standard container as its main body , which is convenient for transportation. The treatment capacity of one unit is 50-200m3/day. We specially developed this system according to the characteristics of urban and rural domestic wastewater, the general industrial waste water and black smelly river course. The wastewater treatment technology AO + MBBR and AO + MBR are adopted to achieve high treatment efficiency and stable effluent quality. The effluent quality can meet "ClassⅠ A / B standard Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002) or Class IV Standard of Environmental Quality Standards for Surface Water (GB3838-2002).