Anaerobic on-site treatment of kitchen waste in combination with black water in UASB-septic tanks at low temperatures.
Anaerobic on-site treatment of a mixture of black water and kitchen waste (BWKW) was studied using two-phased upflow anaerobic sludge blanket (UASB) septic tanks at the low temperatures of 20 and 10 degrees C. Black water (BW) was also treated alone as reference. The two-phased UASB-septic tanks removed over 95% of total suspended solids (TSS) and 90% of total chemical oxygen demand (COD(t)) from both BWKW (effluent COD(t) 171-199mg/l) and BW (effluent COD(t) 92-100mg/l). Also, little dissolved COD (COD(dis)) was left in the final effluents (BW 48-70mg/l; BWKW 110-113mg/l). Part of total nitrogen (N(tot)) was removed (BW 18% and BWKW 40%) and especially at 20 degrees C ammonification was efficient. A two-phased process was required to obtain the high removals with BWKW at 10 degrees C, while with BW a single-phased process may have sufficed even at 10 degrees C. BWKW also produced more methane than BW alone. Sludge in phases 1 of BW and BWKW treatment was not completely stabilised after 198d of operation.
Luostarinen
S
S
University of Jyväskylä, Department of Biological and Environmental Science, P.O. Box 35, 40014 University of Jyväskylä, Finland. sari.luostarinen@bytl.jyu.fi
Rintala
J
J
D000693:Anaerobiosis; D005735:Garbage; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009584:Nitrogen / Q000302:isolation & purification / Q000378:metabolism; D012722:Sewage; D013696:Temperature; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water; D018508:Water Purification / Q000379:methods*
D012722:Sewage; D014867:Water; D009584:Nitrogen