Anaerobic on-site black water and kitchen waste treatment using UASB-septic tanks at low temperatures

• Published in: Water Science & Technology Vol. 54; no. 2; pp. 143 - 149
• Main Authors: Luostarinen, S, Rintala, J
• Format: Journal Article Conference Proceeding
• Language: English
• Published: England IWA Publishing 01.01.2006
• Subjects: Aeration; Anaerobic Digestion; Anaerobic processes; Anaerobic treatment; Anaerobiosis; Biofilms; Bioreactors; Blackwater; Chemical oxygen demand; Denitrification; Effluents; Environmental Restoration and Remediation; Environmental science; Low temperature; Nitrogen; Nitrogen removal; Removal; Septic tanks; Sewage; Sludge; Tanks; Temperature; Upflow anaerobic sludge blanket reactors; Waste treatment; Water tanks; Water treatment
• ISBN: 1843395797; 9781843395799
• ISSN: 0273-1223; 1996-9732
• DOI: 10.2166/wst.2006.497

Anaerobic on-site treatment of black water (BW) and a mixture of black water and kitchen waste (BWKW) was studied in a two-phased upflow anaerobic sludge blanket septic tank (UASBst) at 10-20 degrees C. The processes were fed either continuously or discontinuously (twice per weekday). Moreover, BWKW was post-treated for nitrogen removal in an intermittently aerated moving bed biofilm reactor (MBBR) at 20 degrees C. Removal of total chemical oxygen demand (COD1) was efficient at minimum 90% with all three UASBst at all temperatures. Removal of dissolved COD (CODdis) was also high at approx. 70% with continuously fed BW and discontinuously fed BWKW, while with discontinuous BW feeding it was 20%. Temperature decrease had little effect on COD removals, though the need for phase 2 increased with decreasing temperature, especially with BWKW. Post-treatment of BWKW in MBBR resulted in approx. 50% nitrogen removal, but suffered from lack of carbon for denitrification. With carbon addition, removal of ca. 83% was achieved.