PROCESS FOR INCREASING ACTIVITY OF NITRIFICATION MICROORGANISM IN ACTIVE SLUDGE BY IN-SITU PREPARATION AND ADDITION OF IRON HYDROXIDE

摘要

Provided is a process for increasing the activity of a nitrification microorganism in an active sludge by in-situ preparation and addition of iron hydroxide, comprising a culturing stage for a nitrification microorganism and a long-term activity-maintaining stage, wherein the culturing stage is for increasing the activity of the nitrification microorganism by in-situ preparation and addition of ultra fine particles of iron hydroxide at a mass concentration of 10% in an active sludge system facility, the in-situ preparation being achieved by chemically reacting iron trichloride solution at a mass concentration of 15% and with a 2.6% sodium hydrogen carbonate solution under mixing and stirring in a centrifugal pump, and the long-term activity-maintaining stage involving adding a chemical reagent of an iron salt directly to the active sludge mixture solution, in order to supplement the iron element lost by discharging the remaining sludge. The process improves low temperature resistance of a biological denitrogenation system.