BEHAVIOR OF NITROGEN DURING LIQUEFACTION OF DEWATERED SEWAGE-SLUDGE

The behaviour of nitrogen compounds during the liquefaction of dewater ed sewage sludge was examined. After liquefaction (at 150-350 degrees C), the product mixture was separated into oil A (water-soluble). oil B (water-insoluble), aqueous phase and solid residue. Partition of nit rogen to oil occurred at > 150 degrees C. Above 150 degrees C, 60% of the nitrogen in the sewage sludge was transferred to the aqueous phase . Solubilization and decomposition of the nitrogen compounds were prom oted at 150 degrees C. The distribution of nitrogen to oil B obtained by liquefaction at 300 degrees C was 9%, whereas that to oil A was 11% . (C) 1997 Elsevier Science Ltd.