Tertiary Treatment of Secondary Effluent by Dissolved Air Flotation and Filtration (Sandfloat (Trade Name)) System

摘要

An innovative Sandfloat system has been designed and developed for tertiary treatment of municipal secondary effluent. The new process system consists of two important unit processes: dissolved air flotation and filtration. This report introduces the Sandfloat plant's special engineering features, technology status, process performance, process limitations, chemical requirements residual generation, design criteria, process reliability, environmental impact, etc. Based on the reliable source of technical data from the U.S. Environmental Protection Agency, the treatment efficiency of flotation/filtration system for removal of BOD, COC, TOC, TSS, oil and grease, total phosphorus, phenols, cyanides, various toxic heavy metals, toxic organics, etc. are compiled and documented. In addition to tertiary treatment of municipal effluent, Sandfloat plant can also be used for municipal water treatment, industrial water treatment, industrial waste treatment, pretreatment of reverse osmosis influent, pretreatment of carbon adsorption influent, etc. A full scale 1.1 MGD Sandfloat plant serving 6500 residents in the Town of Lenox, MA, USA is also introduced.