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Biodegradation of s-triazine herbicides at low concentrations in surface waters

Biodegradation of s-triazine herbicides at low concentrations in surface waters

Water Research. 28(11): 2289-2296

Fourteen bacterial strains were isolated from industrial waste (SL) agricultural soil (S), surface water (B) or water treatment filter material (WT) following enrichment in a minimal salts medium (MSM) containing 5-10 mg l-1 of both atrazine and simazine. Biodegradation by the isolates of 1 mu-g l-1 of atrazine and 1 mu-g l-1 simazine in 100 ml MSM or reservoir surface water was assessed by comparison with non-inoculated controls. Extraction with dichloromethane recovered 100 +- 5% of both s-triazines in non-inoculated MSM and reservoir surface water. Recovery was not reduced by adsorption of the s-triazines to bacteria, and no abiotic degradation occurred over the incubation periods. Isolate S4 degraded 20 +- 7% of the atrazine and isolates S7 and S8 degraded 40 +- 12% of the simazine in MSM after 7 d at 30 degree C. Decreasing the NH-4NO-3-N in the MSM from 35 mg l-1 to 1 mg l-1 stimulated biodegradation of atrazine by a fourth isolate (SL3). At 10 degree C isolates BI, SL2, S4 and S6 each biodegraded 20 +- 1% of the atrazine and isolate SL2 biodegraded 30 +- 7% of the simazine in surface water after 15 d. No biodegradation occurred in MSM at 10 degree C. Granular activated carbon (GAC, 1 g l-1) was added to surface water (10 mu-g l-1 atrazine and 10 mu-g l-1 simazine) which adsorbed 9.7 mu g g-1 s-triazine and provided sites for bacterial attachment. Recovery of adsorbed s-triazines (1, 10 and 40 mu-g l-1) by Soxhlet extraction of non-inoculated GAC was 97 +- 1.5%. Inoculation of s-triazine-degraders into surface water containing GAC reduced the solution concentration (0.3 mu-g l-1 atrazine and 0.3 mu-g l-1 simazine) by up to 86 +- 18% (S8) after incubation for 15 d at 10 degree C. Biodegradation of 25 mu-g l-1 atrazine and 28 mu-g l-1 simazine in surface water amended with 0.5 g l-1 GAC and inoculated with isolate WT1 was 50 +- 4% (atrazine) and 38 +- 4% (simazine) after 21 d at 10 degree C. Biodegradation by WT1 attached to 0.5 g GAC in surface water (0.5 mu-g l-1 atrazine and 6 mu-g l-1 simazine) was increased from zero atrazine and 23 +- 7.6% simazine to 40 +- 5.3% atrazine and 71 +- 5.6% simazine following transfer of bioaugmented GAC into fresh surface water. Inoculation of GAC filters with selected strains has potential as a biotreatment for surface water containing s-triazine herbicides.

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Accession: 008227935

Download citation: RISBibTeXText

DOI: 10.1016/0043-1354(94)90044-2

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