35 / 2023-12-23 09:24:45

Operation Assessment of Sequencing Batch Reactor Using Suspended and Granular Biomass by Treating Tannery Wastewater

operation assessment,sequencing batch reactor,tannery wastewater

The tanneries generate an effluent that is characterized mainly by high organic load, high conductivity and the presence of heavy metals such as chromium. The objective of this study is the evaluation of the operation of two reactors by sequential batches (SBR), the first used suspended biomass and the second used granular biomass, both for the elimination of organic matter and nitrogen from effluent of the same tannery. For evaluating the operation of both reactors in the removal of organic matter and nutrients in effluent, the following stages were carried out: a) information collection, b) data processing and c) obtaining results. It was concluded that the rate of COD removal  in an SBR for cycle lengths of 6, 12 and 24 hours using biomass suspended under aerobic conditions was smaller than the rate of COD removal performed by the granular biomass. NH₄ ⁺ -N was removed with an efficiency varying between 90 and 97% for a cycle time of 12 hours achieving the total removal of NH₄ ⁺ -N for cycle times estimated between 12.39 and 13.25 hours. Based on the results through which the performance of SBR reactors  was compared, the following conclusions can be derived:1. COD removal rate in an SBR for cycle durations of 6, 12 and 24 hours using suspended biomass under aerobic conditions was smaller than the removal rate of granular biomass under aerobic conditions and a combination of 25% anaerobic and 75% aerobic for cycle duration times of 24 and 6 hours. 2. COD removal profile within the SBR cycle for cycle durations of 6, 12 and 24 hours allowed to assume that the minimum point of COD in the influent to the SBR was occurring when the removal of carbonated organic matter was completed. and a slight increase in COD was occurring due to the production of nitrogenated products such as ammonium and nitrite as a consequence of the synthesis of biodegradable organic matter. 3. The removal rate of the ammonium nitrogenous form (NH4+-N) and total Kjendhal nitrogen (NTK) in an SBR for cycle durations of 12 hours using suspended biomass in the carbonated organic matter removal (aeration) and Conventional nitrification-denitrification (CND) applying slow (L), fast (R), and staged (E) filling times showed that the removal gradient of suspended biomass under fast filling times conditions was slightly higher in the condition slow and staged filling than in the fast filling condition.