As the core technology of the vertical water treatment complex, it addresses the pain points of traditional biochemical pools: "extensive land occupation (occupying 10%-20% of the space of traditional pools), high energy consumption, single process, and environmental pollution". Through vertical space utilization, it saves 80%-90% of land. It supports free switching between AAO (anaerobic-anoxic-aerobic, full nitrification and denitrification) and AOA (anaerobic-aerobic-anoxic, short-cut nitrification + anaerobic ammonia oxidation) processes. The AOA process can reduce oxygen consumption by 62.5%, organic carbon source addition by 100%, and CO emissions by 20%, significantly saving energy and reducing carbon. The entire system uses steel tanks (complying with GB 50341-2014 and GB50128-2014 standards), with shot blasting rust removal up to Sa2.5 level + 400-micron polymer coating for anti-corrosion. It operates in closed negative pressure (equipped with 4-5 stage air purification system, odorless emission), eliminating environmental pollution. It can also recover sewage heat energy (sewage source heat pump for heating and cooling) and sludge biomass energy, promoting sewage plants from "energy-consuming units" to "energy output centers", perfectly adapting to urban and park scenarios with tight land and high low-carbon requirement