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The effect of oxygen concentration on simultaneous sewage sludge digestion and metal leaching (SSDML) process was studied in 30 l reactors. Sewage sludge from Black Lake (Quebec) wastewater treatment plant was used. Concentrations of 1, 2, 3, 5 and 7 mg/l of oxygen were maintained successively in each of the reactor experiments. The increase in the DO concentration from 2 to 7 mg/l in the sludge resulted...
Effluent recirculation was investigated in a vertical flow reed bed system treating an agricultural wastewater. A comparison was made for the efficacy of this system before and after recirculation was adopted. Recirculation considerably improved the removal of BOD 5 , COD, suspended solids (SS) and NH 4 -N. The most significant improvement was made for NH 4 -N, and nitrification...
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