Anaerobic purification of brewery wastewater in biofilm reactors with and without a methanation cascade
1994; Pergamon Press; Volume: 30; Issue: 12 Linguagem: Inglês
10.2166/wst.1994.0639
ISSN1996-9732
AutoresErnst A. Stadlbauer, L. N. Oey, Bernd Weber, K.M.B. Jansen, R. Weidle, H. Löhr, W. Ohme, Gary L. Doll,
Tópico(s)Odor and Emission Control Technologies
ResumoA laboratory scale anaerobic treatment process for brewery wastewater has been investigated. It utilised a continuously stirred tank (CST) acidification reactor (11.3 1) plus an anaerobic treatment system which consisted of either a downflow stationary fixed film (DSFF) reactor (20.7 1) or a DSFF reactor in series with a floc (FLOC) or sludge blanket reactor (20.8 1). At the same residence time the combination of DSFF and FLOC reactor performed better than a single methane digester. Using low and high strength wastewater, degradation yields of 80-90% were obtained at total loading rates BR,COD up to 10 kg COD m−3 × d and a residence time t less than one day. Mean values of methane yield were 0.31 m3STP kg-1 COD or 2.91 m3STP m−3 × d. Inert support media investigated consisted of inorganic materials such as porous Kerapor 1000 and glass sponge (Siran) with macro- and micropores or polyurethane foam (Filtren TR 30) with an open net structure. In all cases SEM showed appropriate surface characteristics for microbial attachment. After 4 months of operation biofilm thickness on inorganic support media was 0.4-0.9 mm at a superficial linear velocity (SLV) of 10-5 mm min−1. Under these conditions biofilm on Filtren TR 30 was noticeably thicker (up to 2 mm). Concerning metal contamination of biofilm on Filtren TR 30, Al, Fe and Zn showed elevated levels above 2000 ppm.
Referência(s)