Performance evaluation of biosimulator for treating domestic wastewater using activated sludge treatment system

Abstract

This research investigation was aimed at demonstrating the performance evaluation of pilot activated sludge treatment system (biosimulator; model MF-114). An intensive analytical program was followed for evaluating the performance efficiency of the biosimulator by maintaining the dissolved oxygen (DO) concentration at 4.0 mg/L throughout the study period. Biosimulator performance was evaluated after every 2 hours and analyzed for pH, DO, COD, ammonia-nitrogen (NH 3 -N), nitrite-nitrogen (NO 2 -N) and nitrate-nitrogen (NO 3 -N). In all ten experimental replicates were performed and the mean figures are taken for discussion. Although no significant variation in the pH was observed during the study period but the mean pH values of the samples during the treatment process gradually increased and it ranged from 6.81-7.52. The removal of COD was found to be in direct relationship with retention time and the mean COD of the raw wastewater samples ranged from 164-1160 mg/L whereas it got reduced considerably during the treatment process and the mean removal efficiency was found to be 86%. The COD and NO 2 -N removal efficiency was better than NH 3 -N and NO 3 -N this is considered to be satisfactory especially with respect to organic loading and retention time. Similarly, the mean NH 3 -N values of wastewater after 29 hours of treatment were found to be fluctuating between 14.52-20.54 mg/L whereas the mean NO 3 -N level of the raw wastewater ranged from 0.106-0.279 mg/L. The overall conditions were very much favorable even at high organic loading and minimum retention time. It is therefore concluded that the system is practically feasible for the treatment of wastewater containing high content of organic matter. @JASEM

Experimental Comparison between Moving Bed Biofilm Reactor (MBBR) and Conventional Activated Sludge (CAS) for River Purification Treatment Plant

“…Results show that residual AN in CAS was still very high due to decreased nitrification activity which is responsible for converting AN to Nitrate (NO3-N). In CAS, the presence of high organic load which could not be degraded completely by the microorganisms may also decrease the AN reduction [13] 7.00 The results in this study depicted prominent performance for MBBR in most constituents removal compared to CAS. Application of biofilm carriers in the MBBR reactor increased the population of autotrophic microorganisms which have an important role in nitrification, denitrification and biological constituent removal.…”

“…From Day One, DO level has shown satisfactory result with a minimum level of 5.90 mg/L. At the initial state, it is important to make sure that DO level is more than 2.0 to 4.0 mg/L [7], [12], [13].…”

Water Quality Assessment Klang River Water Treatment Plants

“…pH is crucial for monitoring the purification activities in the surface water. Hydrolysis process of organic compounds by biological degradation and rate of collision of sediment aggregated process is highly dependent on pH [17]- [19].Most of the pH result at the outlet point is considerable achieve the target Class II B except for July 2015 (Class III) as shown in Fig 2. The temperature of effluent varies from 19.0 to 28.5 C as depicted in Fig 3. The effluent COD for most of the month is according to the standard range gazette by INWQS Class IIB (Fig 4) which is permitted to be within COD 10-205 mg/L [20]. COD can be useful in pinpointing toxic condition and presence of biological resistant substances.…”