PERFORMANCE OF AN INTEGRATED BIO FILM BAFFLE REACTOR (IBBR) TO TREAT DOMESTIC WASTEWATER

摘要

Eutrophication is becoming more serious because of the excessive emissions of nitrogen and phosphorus. Therefore, removal efficiency of nitrogen and phosphorus should be raised when the removal of organic matter should have good effects for decentralized domestic wastewater. IBBR was used to treat domestic wastewater and the removal efficiencies of COD_(Cr), TP, and TN were investigated by changing some operating parameters. The results indicated that COD_(Cr) removal of IBBR was better. When IBBR operated stably, effluent COD_(Cr) was below 50 mg/L. With the SEM, abundant microorganisms could be observed on Biofilm in the biological reaction units. Due to the role of biological nitrogen and phosphorus removal, when the reflux ratio of nitrification liquid was increased from 100 to 400%, the removal efficiency of TN was increased from below 26 to 50%, and the removal efficiency of TP was increased from below 20 to 50%. After aluminum sulfate was added into the chemically enhanced unit, effluent TP was below 0.5 mg/L. Therefore, the popularization and application prospects of IBBR were good in China's rural areas and other developing countries. It would gain certain environmental benefits.