along the length of the reactor. Trend for average total and volatile solids (TS and VS) removal was similar to TCOD and SCOD removal with initial removal efficiency of 30% (TS removal) and 35% (VS removal) respectively in C1 (Fig. 2c and d). TS and VS removal effi- ciencies doubled in C2 and stabilized thereafter in the remaining chambers at 76% and 89% respectively (Table 1).