Activated sludge systems operated under alkaline conditions remove EDTA. To improve EDTA removal a better understanding of EDTA biodegradation and its intermediates as well as knowledge of kinetic parameters are a prerequisite. Activated sludge appeared to degrade EDTA via ethylenediaminetriacetate (ED3A). The sludge was able to split ED3A into readily biodegradable iminodiacetic acid and iminoacetaldehydeacetate. The maximum growth rate of EDTA-grown sludge was approximately 0.15 days−1. The Km for EDTA and maximum oxidation rate of EDTA-grown sludge were 10 mg/L and 135 mg O2 g−1 SS day−1. Specially cultivated activated sludge degraded EDTA under neutral conditions and was capable of degrading the FeEDTA complex at a low rate. Bioaugmentation of EDTA-grown sludge enabled EDTA removal in a treatment system under neutral conditions.
Biodegradation of EDTA in Pulp and Paper Mill Effluents by Activated Sludge
C. G. van Ginkel, H. Kester, C. A. Stroo, A. M. van Haperen; Biodegradation of EDTA in Pulp and Paper Mill Effluents by Activated Sludge. Water Sci Technol 1 December 1999; 40 (11-12): 259–265. doi: https://doi.org/10.2166/wst.1999.0720
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