A purification tank is a small domestic wastewater treatment unit.Originating from Japan, it is used for the treatment of dispersed domestic wastewater or similar effluents. Pre-treatment is conducted through sedimentation separation tanks to remove heavier particles and suspended solids, enhancing the biodegradability of the wastewater; the pre-filtering tanks are filled with media, where anaerobic biofilms on the media remove soluble organic matter; the aeration tanks combine aeration, high filtration rate, suspended solids retention, and regular backwashing. The overflow weir of the sedimentation tank is equipped with a disinfection device, which provides disinfection treatment for the effluent. 

Scope of Treatment: Sewage treatment for scenic spots and historical areas; wastewater treatment for drinking water sources and ecological protection zones. Reuse of recycled water in hotels, inns, and similar establishments.