satisfying the nutrient balance criteria for activated sludge process
to sustain aerobic metabolic activities. This implies that anaerobically
digested POME is suitable for activated sludge process without
the additional cost of adding nutrients into the system.
During the start-up period, it should be noted that there was
neither any addition of activated sludge into the SBR nor sludge
wastage from the system after the SBR was seeded. Throughout the
acclimatizing phase, the MLVSS concentration demonstrated
a steady rise from 4300 to 11,700 mg/L as shown in Fig. 1 a. The rise
in MLVSS concentration reflects the active growth of bacteria which
indicates the success of start-up. The bacteria consumed organic
matters and multiplied to form new cells. Fig. 1b illustrates the
percentages of COD and TSS removal during the start-up period. As
the feed COD increased stepwise, the removal efficiency of both
COD and TSS decreased gradually. However, both removal
percentages were relatively high albeit decreasing i.e. 91.7e97.7%
and 97.3e99.3%, respectively. On the other hand, the COD and TSS
removal efficiencies started to increase from the 20th day. This
signifies the microorganism were gradually adapting to the
increasingly high COD concentration of the influent. For most
industrial wastewaters, an acclimation period is necessary to
gradually expose the microbial community to potentially inhibitory
or toxic organic compounds. This allows the development of
appropriate enzyme producing genes that are essential to induce
biodegradation (Metcalf and Eddy, 2003). In this study, acclimation
was considered complete since the effluent COD and effluent TSS
were relatively constant after 28 days.
satisfying the nutrient balance criteria for activated sludge processto sustain aerobic metabolic activities. This implies that anaerobicallydigested POME is suitable for activated sludge process withoutthe additional cost of adding nutrients into the system.During the start-up period, it should be noted that there wasneither any addition of activated sludge into the SBR nor sludgewastage from the system after the SBR was seeded. Throughout theacclimatizing phase, the MLVSS concentration demonstrateda steady rise from 4300 to 11,700 mg/L as shown in Fig. 1 a. The risein MLVSS concentration reflects the active growth of bacteria whichindicates the success of start-up. The bacteria consumed organicmatters and multiplied to form new cells. Fig. 1b illustrates thepercentages of COD and TSS removal during the start-up period. Asthe feed COD increased stepwise, the removal efficiency of bothCOD and TSS decreased gradually. However, both removalpercentages were relatively high albeit decreasing i.e. 91.7e97.7%and 97.3e99.3%, respectively. On the other hand, the COD and TSSremoval efficiencies started to increase from the 20th day. Thissignifies the microorganism were gradually adapting to theincreasingly high COD concentration of the influent. For mostindustrial wastewaters, an acclimation period is necessary togradually expose the microbial community to potentially inhibitoryor toxic organic compounds. This allows the development ofappropriate enzyme producing genes that are essential to induce
biodegradation (Metcalf and Eddy, 2003). In this study, acclimation
was considered complete since the effluent COD and effluent TSS
were relatively constant after 28 days.
การแปล กรุณารอสักครู่..