Development of a new process for detoxification of digested sewage sludge

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Simultaneous removal of nonylphenol and heavy metals from anaerobically digested sewage sludge was investigated using an advanced oxidation process at pH 2. Nonylphenol in aqueous solution was degraded in the presence of both H_2O_2 and Fe ion, which will be due to the formation of hydroxyl radicals through Fenton's reaction. Degradation rate of nonylphenol was much greater in the presence of Fe(II) ion than Fe(III) ion. The content of nonylphenol in the sewage sludge was significantly decreased by addition of both H_2O_2 and Fe ion, although no decrease in nonylphenol occurred in the presence of either H_2O_2 or Fe ion. More than 80% of Cd, Cu, Mn and Zn were eluted from the sludge by addition of both H_2O_2 and Fe ion. Acidification of the sludge eluted 70% of P, whereas addition of Fe ion more than 0.82g/l decreased the release of P below 15%.1 From these results, it was found that nonylphenol and heavy metals could be simultaneously removed without phosphorus loss from anaerobically digested sewage sludge using the Fenton process.