Enhanced treatment efficiency of an anaerobic sequencing batch reactor (ASBR) for cassava stillage with high solids content(ENVIRONMENTAL BIOTECHNOLOGY)

概要

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Cassava stillage is a high strength organic wastewater with high suspended solids (SS) content. The efficiency of cassava stillage treatment using an anaerobic sequencing batch reactor (ASBR) was significantly enhanced by discharging settled sludge to maintain a lower sludge concentration (about 30g/L) in the reactor. Three hydraulic retention times (HRTs), namely 10d, 7.5d, 5d, were evaluated at this condition. The study demonstrated that at an HRT of 5d and an organic loading rate (OLR) of 11.3kg COD/(m^3d), the total chemical oxygen demand (TCOD) and soluble COD (SCOD) removal efficiency can still be maintained at above 80%. The settleability of digested cassava stillage was improved significantly, and thus only a small amount of settled sludge needed to be discharged to maintain the sludge concentration in the reactor. Furthermore, the performance of ASBR operated at low and high sludge concentration (about 79.5g/L without sludge discharged) was evaluated at an HRT of 5d. The TCOD removal efficiency and SS in the effluent were 61% and 21.9g/L respectively at high sludge concentration, while the values were 85.1% and 2.4g/L at low sludge concentration. Therefore, low sludge concentration is recommended for ASBR treating cassava stillage at an HRT 5d due to lower TCOD and SS in the effluent, which could facilitate post-treatment.
社団法人日本生物工学会の論文