Abstract
Aerobic granular sludge has attracted extensive interest of researchers since the 90s due to the advantages of aerobic granules such as good settling ability, high biomass accumulation, being resistant to high loads and being less affected by toxic substances. Studies, however, which have mainly been carried out on synthetic wastewater, cannot fully evaluate the actual ability of aerobic granules. Study on aerobic granular sludge was performed in sequencing batch reactors, using seeding sludge taken from anaerobic sludge and tapioca wastewater as a substrates. After 11 weeks of operation, the granules reached the stable diameter of 2- 3 mm at 3.7 kgCOD/m3.day organic loading rate. At high organic loads, in range of 1.6 - 5 kgCOD/m3.day, granules could treat effectively COD, N, P with performance of 93 – 97%; 65 – 79% and 80 – 95%, respectively.
Highlights
Aerobic granular sludge formation and applying them in practical wastewater treatment was concerned for many years with some advantages as follows: high Stability and flexibility, Low energy requirements, Reduced footprint, Good biomass retention, Reduced investment and operational costs
COD removal efficiency was still higher than 92% (Figure 4) and the sludge volume index (SVI) was lower than 50 mL/g due to a drop of water content in sludge and an increase in biomass density
Aerobic sludge particles can be formed from the initial culture anaerobic sludge without carriers and with the short time for granulation formation
Summary
Aerobic granular sludge formation and applying them in practical wastewater treatment was concerned for many years with some advantages as follows: high Stability and flexibility, Low energy requirements, Reduced footprint, Good biomass retention, Reduced investment and operational costs. Flocculated sludge with low settling velocities is applied and large settling tanks are needed to separate clean effluent from the organisms. Conventional processes need many steps for nitrogen, COD and phosphate removal, with large recycle flows and a high total hydraulic retention time. Surplus sludge from a municipal wastewater plant needs different steps to dewater (e.g. thickening and filterpressing) before it can be processed. To overcome the disadvantages of a conventional wastewater treatment plant, biomass has to be TAÏP CHÍ PHAÙT TRIEÅN KH&CN, TAÄP 16, SOÁ M1- 2013 grown in a compact form, like aerobic granular sludge
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