FORFARANDE FOR BEHANDLING AV AVLOPPSVATTEN

摘要

Wastewater is continuously disinfected by combining the wastewater with sufficient acid to reduce the pH of the wastewater to less than about 4 and with sufficient SO2 that the wastewater has a selected free SO2 content of at least 5 mg/liter. The combined SO2/wastewater is maintained at the selected free SO2 content for at least about 5 minutes. The wastewater can be treated by dissolving SO2 into a first portion of the wastewater and combining the first portion with SO2 dissolved therein with a second portion of the wastewater stream. SO2 can be stripped from the wastewater, and the stripped SO2 can be recycled.