A study on using fireclay as a biomass carrier in an activated sludge system |
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Authors: | Tilaki Ramazan Ali Dianati |
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Institution: | (1) Department of Environmental Health, Faculty of Health, Mazandaran University of Medical Sciences, Km 18 Khazar Abad Road, Sari, Iran |
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Abstract: | By adding a biomass carrier to an activated sludge system, the biomass concentration will increase, and subsequently the organic
removal efficiency will be enhanced. In this study, the possibility of using excess sludge from ceramic and tile manufacturing
plants as a biomass carrier was investigated. The aim of this study was to determine the effect of using fireclay as a biomass
carrier on biomass concentration, organic removal and nitrification efficiency in an activated sludge system. Experiments
were conducted by using a bench scale activated sludge system operating in batch and continuous modes. Artificial simulated
wastewater was made by using recirculated water in a ceramic manufactutring plant. In the continuous mode, hydraulic detention
time in the aeration reactor was 8 and 22 h. In the batch mode, aeration time was 8 and 16 h. Fireclay doses were 500, 1,400
and 2,250 mg l−1, and were added to the reactors in each experiment separately. The reactor with added fireclay was called a Hybrid Biological
Reactor (HBR). A reactor without added fireclay was used as a control. Efficiency parameters such as COD, MLVSS and nitrate
were measured in the control and HBR reactors according to standard methods. The average concentration of biomass in the HBR
reactor was greater than in the control reactor. The total biomass concentration in the HBR reactor (2.25 g l−1 fireclay) in the continuous mode was 3,000 mg l−1 and in the batch mode was 2,400 mg l−1. The attached biomass concentration in the HBR reactor (2.25 g l−1 fireclay) in the continuous mode was 1,500 mg l−1 and in the batch mode was 980 mg l−1. Efficiency for COD removal in the HBR and control reactor was 95 and 55%, respectively. In the HBR reactor, nitrification
was enhanced, and the concentration of nitrate was increased by 80%. By increasing the fireclay dose, total and attached biomass
was increased. By adding fireclay as a biomass carrier, the efficiency of an activated sludge system to treat wastewater from
ceramic manufacturing plants was increased. |
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