Biotreatment of s‐triazine‐containing wastewater in a fluidized bed reactor

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Abstract
Mixed cultures of microorganisms immobilized on sand were used to degrade s-triazine-containing industrial wastewater in a fluidized bed reactor. Immobilized cell concentrations of up to 18 g/L volatile suspended solids could be achieved with the s-triazines as sole nitrogen source for growth and carbon sources added at a CN ratio of about 12. Maximal removal efficiencies of 80% of the s-triazines could be maintained only if (a) the bio-film thickness was limited to avoid oxygen deficiency and (b) the carbon source and complete wastewater (⩽50% v/v in the feed) were supplied continuously at a mean hydraulic residence time of ≥20–25 h.