Treatment of a slaughterhouse wastewater: effect of internal recycle rate on chemical oxygen demand, total Kjeldahl nitrogen and total phosphorus removal

• Published in: Environmental technology 2011-11, Vol.32 (15), p.1755-1759
• Main Authors: Fongsatitkul, P, Wareham, D. G, Elefsiniotis, P, Charoensuk, P
• Format: Article
• Language: English
• Subjects: Abattoirs; Applied sciences; Biological Oxygen Demand Analysis; carbon; Chemical engineering; chemical oxygen demand; dissolved oxygen; environmental technology; Exact sciences and technology; General purification processes; Hydrogen-Ion Concentration; Industrial Waste; nitrogen; Nitrogen - analysis; nitrogen and phosphorus removal; nitrogen content; phosphorus; Phosphorus - analysis; Pollution; Reactors; recycling; slaughterhouse wastewater; slaughterhouses; Waste Disposal, Fluid - methods; wastewater; Wastewaters; Water Purification - methods; Water treatment and pollution
• ISSN: 1479-487X; 0959-3330; 1479-487X
• DOI: 10.1080/09593330.2011.555421

This study investigated the ability of an anaerobic/anoxic/oxic (A²/O) system to treat a slaughterhouse wastewater. The system employed two identical continuous-flow reactors (10 l total liquid volume each) running in parallel with the main operational variable, being the internal recycle (IR) rate. The chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN) and total phosphorus (TP) performance was evaluated as the IR flowrate was increased from a Q of 15 l d⁻¹ to 4Q at a system hydraulic retention time of 16 h and a solids retention time of 10 d. The COD:TKN and COD:TP ratios were 8.2:1 and 54:1, which supported both nitrogen and phosphorus removal. For all IR multiples of Q, the COD removal was in excess of 90%. The TKN removal showed a modest improvement (a 4–5% increase, depending on the dissolved oxygen (DO)) as the IR doubled from Q to 2Q, but no further increase was observed at the 4Q IR rate. The TP removal reached its optimum (around 85%–89% (again depending on the DO)) at the 2Q rate.