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Cultivation of Biogranules in a Continuous Flow Reactor at Low Dissolved Oxygen
Authors:Yuan-Cai Chen  Che-Jen Lin  Hong-Lei Chen  Shi-Yu Fu  Huai-Yu Zhan
Institution:1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou, 510640, China
2. Department of Civil Engineering, Lamar University, Beaumont, TX, 77710-0024, USA
3. School of Environmental Science & Engineering, South China University of Technology, Guangzhou, 510006, China
Abstract:This study investigated sludge granulation inoculated with various mixtures of aerobic and anaerobic sludge at low dissolved oxygen (DO; 0.3–0.6 mg/l) or aerobic (>2.5 mg/l) conditions in four parallel flow reactor systems. Formation of high-density coupled granules was achieved in the reactor system inoculated with anaerobic and aerobic sludge seeds (1:1 mass ratio) at low DO concentrations, with a mean size of 2.5 mm after only 27 days of cultivation. The highest ratio of protein (PN) to polysaccharide (PS; 3.3) was observed for the coupled sludge compared to granules cultivated under aerobic conditions. The PN/PS ratio correlated well with high hydrophobicity, low sludge volumetric index, and compact granular structure. Activity tests of the specific anaerobic and aerobic biomass confirmed that anaerobes and aerobes coexisted in the same coupled granule. Based on the optical microscopic and SEM observations, the process of coupled granule formation was proposed.
Keywords:
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