Effect of HRT, SRT and temperature on the performance of activated sludge reactors treating bleached kraft mill effluent

Evaluation of physicochemical parameters influencing bulking episodes in a municipal wastewater treatment plant

“…This mean value coincides with that value proposed for the WWTP design (3,020 mg/l), and it is the typical design parameter for the activated-sludge process called "conventional plug flow" [1]. [8] found a mean value of 1,675 ± 191 mg/l for MLVSS on activated-sludge reactors treating kraft pulping effluent. Wang et al [9] have reported a MLSS of 7,800 mg/L in an aerobic granular sludge cultivated in a sequencing batch reactor.…”

Modern Applied Science, Vol. 2, No. 5, September 2008, all in one file

“…The removal ranges for COD at HRTs of 36 hours and 24 hours were 50-80% and 50-66%, respectively. As was previously observed by the study of Barr et al (1996), the removal of COD was found to decrease with the decreasing of the HRT. It was also observed that at the initial stage of the study (approximately within the first 20 days), the COD removal was higher even though the biomass concentration was below 2000 mgL -1 .…”

Removal of Adsorbable Organic Halides (AOX) from Recycled Pulp and Paper (P&P) Mill Effluent Using Granular Activated Carbon–Sequencing Batch Biofilm Reactor (GAC-SBBR)

“…The longer HRT would mean a much longer period for the microbe to react with chlorophenol in the reactor thus giving rise to more biomass in order to continue with the biodegradation process. Barr et al (1996) had also confirmed the earlier presumption that an increased HRT could improve AOXs removal and decreasing HRTs would result in a decrease in the toxicity removal. It is thus indicated that as the HRT decreases, a greater proportion of the more recalcitrant compounds will resist to biodegradation.…”