By the conclusion of the trial, the removal rates had dropped to 17 and 24 g/mTwo media heights (0.9 m and 1.8 m) were tested under the same operating conditions provided (Reduction in sCOD with treatment time for the two assessed media heights, 0.9 and 1.8 m.Reduction in sCOD with treatment time for the two assessed media heights, 0.9 and 1.8 m.The results clearly indicate that the media height of 1.8 m demonstrated a greater initial sCOD removal rate (larger surface area for biomass growth) before becoming substrate limited (starved) after approximately 50 hr of treatment.

The minimum and maximum feed strengths used in the previous organic loading trial were chosen as they were expected to show the greatest comparison when subjected to a shock load. This, combined with a lower F/M ratio, resulted in the COD removal rate decline.Impact of media height on required time to meet discharge target and subsequent sCOD removal rateIncreasing the media height gave no additional benefits in terms of reducing the final sCOD after the 120 hr of treatment: 332 ± 104 and 351 ± 40 mg sCOD/L for 0.9 and 1.8 m, respectively. In this context, attached growth systems (AGS) present an attractive option based on their small footprint, great tolerance to hydraulic and contaminant shock loads, and low operational and maintenance costs (In an AGS, micro-organisms form a biofilm on a support media over which wastewater is applied (AGS typically use recirculation to increase the wastewater contact time with the active biological material, dilute shock loads, increase dissolved oxygen (DO) levels (to aid nitrification), maintain media wetness and control excess biomass (The number of recirculation passes, or contact time, is heavily dependent on the volume of water to be treated, the influent strength and required concentration of the final effluent. This effectively counterbalanced the early drop in pH (<5 pH) observed during the first 20 hr of treatment. Voters were limited to two beers from any one brewery and encouraged to diversify their choices across years, states and styles. I never use nails in my designs. #BrewReview However, the sharp increase in removal rate does plateau at the very high loading rates (above 300 g/mThe previous research of the BioGill™ system for other wastewaters demonstrates a similar relationship to that identified in this study but showed greater removal rates for COD loading rates less than 250 g/mThe treatment of brewery wastewater by RBCs demonstrated high COD removal rates (up to 99%) for low loading rates; however, peaked at a maximum value of approximately 25–30 g/mA shock load condition was assessed when the modules received an initial feed strength of 7.4 and 2.5 g/L, respectively. A series of samples (feed and final effluent samples) were sent to an external laboratory for sBODThe sCOD values were obtained by first filtering the water samples through Advantec GC-90 glass fibre filter paper before being heated and analysed in an RD125 Thermoreactor and MD600 Photometer, respectively. A high organic loading rate (OLR) promotes rapid biomass growth and hence organic removal (by heterotrophic bacteria); however, increased recirculation and treatment time may be required due to plugging of pores or media flooding should the growth become excessive (The AGS assessed within this study was an AGBR, a hybrid system with an aerobic and anaerobic phase. Jake Finkbeiner is on Facebook. Join Facebook to connect with Kolin Finkbeiner and others you may know.