Combining submerged membrane technology with anaerobic and ...

DTN and N-NH 4+ (mg·L-1 )DTN and N-NH 4+ (mg·L-1 )Chapter 3No significant nitrification was observed in either SBR. During period I, nitrificationwas initiated in the F-SBR, but the dissolved oxygen limitation and the OLR increase thattook place on day 111 interrupted this biological process. Nevertheless, ammonia wasoxidised to either nitrite or nitrate in both tertiary filtration chambers, from day 215 onwards(figure 3.6).a240Period IIIIIIIVV2001601208040b02400 50 100 150 200 250 300 350Time (d)Period III III IV V200160120804000 50 100 150 200 250 300 350Time (d)Figure 3.6. Dissolved total nitrogen in the feeding (•) and ammonia concentration in theSBR effluent () and the filtration chamber permeate (▲) in the F-SBR (a) and G-SBR(b) systems.96