Development of a treatment system for molasses wastewater: the effects of cation inhibition on the anaerobic degradation process.
This study evaluated the process performance of a novel treatment system consisting of an acidification reactor, an upflow staged sludge bed (USSB) reactor, an upflow anaerobic sludge blanket reactor, and an aerobic trickling filter for the treatment of a high-strength molasses wastewater with a chemical oxygen demand (COD) of up to 120,000mg/L. The USSB operating at 35°C was capable of achieving an organic loading rate of 11kgCOD/m(3) day with a methane recovery of 62.4% at an influent COD of 120,000mg/L. The final effluent COD was 4520mg/L. The system was effective with regard to nitrification and sulfur removal. Fifty percent inhibition of the bacterial activity of the retained sludge by the cations was determined at 8gK/L for sucrose degradation, 16gK/L for sulfate reduction, and 12gK/L or 9gNa/L for acetoclastic methane production. Cation inhibition of anaerobic degradation reduced the process performance of the USSB.
Center for Regional Environmental Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
Takashi
T
Onodera
Shinya
S
Sase
Pairaya
P
Choeisai
Wilasinee
W
Yoochatchaval
Haruhiko
H
Sumino
Takashi
T
Yamaguchi
Yoshitaka
Y
Ebie
Kaiqin
K
Xu
Noriko
N
Tomioka
Motoyuki
M
Mizuochi
Kazuaki
K
Syutsubo
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D061249:Batch Cell Culture Techniques / Q000295:instrumentation*; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D002412:Cations; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005525:Food-Processing Industry; D008697:Methane / Q000302:isolation & purification / Q000378:metabolism*; D008965:Molasses / Q000382:microbiology*; D062065:Wastewater / Q000382:microbiology*; D014874:Water Pollutants, Chemical; D018508:Water Purification / Q000295:instrumentation*
D002412:Cations; D008697:Methane; D062065:Wastewater; D014874:Water Pollutants, Chemical