Wastewater treatment engineering of ECO-WASTE mainly refers to rural domestic wastewater treatment, urban fecal treatment, softened water treatment, reuse of recycled water, seawater desalination, industrial wastewater treatment as well as wastewater treatment in special industries such as slaughters, breeding, hospitals and landfill leachate. With technological innovation, ECO-WASTE applies no-sludge biological fluidized bed technique, heterogeneous photocatalysis pre-treatment technique, energetic particle strong oxidization technique, HASR high-efficient anaerobic technique, BOBM high-efficient aerobiotic technique and membrane separation technique in different water treatment fields.