Anaerobic on-site treatment of black water and dairy parlour wastewater in UASB-septic tanks at low temperatures.
Anaerobic on-site treatment of synthetic black water (BW) and dairy parlour wastewater (DPWW) was studied in two-phased upflow anaerobic sludge blanket (UASB)-septic tanks at low temperatures (10-20 degrees C). At all temperatures, total chemical oxygen demand (COD(t)) removal was above 90% with BW and above 80% with DPWW and removal of total suspended solids (TSS) above 90% with both wastewaters. Moreover, dissolved COD (COD(dis)) removal was approx. 70% with both wastewaters indicating good biological activity of the sludges. With BW, a single-phased reactor was found sufficient for good COD removals, while with DPWW, a two-phased process was required. Temperature optimum of reactor sludges was still 35 degrees C after long (398d) operation. Most of the nutrients from BW were removed with TSS, while with DPWW nutrient removal was low. In conclusion, UASB-septic tank was found feasible for (pre)treatment of BW and DPWW at low temperatures.
Luostarinen
Sari A
SA
Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FIN-40014, Finland. sari.luostarinen@bytl.jyu.fi
Rintala
Jukka A
JA
D001421:Bacteria, Anaerobic / Q000378:metabolism*; D019149:Bioreactors; D003612:Dairying; D005160:Facility Design and Construction; D010100:Oxygen / Q000737:chemistry / Q000378:metabolism; D012722:Sewage / Q000737:chemistry / Q000382:microbiology*; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D014867:Water; D018508:Water Purification / Q000379:methods*
D012722:Sewage; D014867:Water; D010100:Oxygen