Glyphosate degradation by immobilized bacteria: field studies with industrial wastewater effluent

Article Abstract:

The efficacy of immobilized bacteria in removing glyphosate from wastewater effluent was investigated in a field study at the John Manville Corp pilot plant. Results show that microbes with glyphosate-degrading activity can remove up to 50 mg ofglyphosate per liter. This capability depends on a nitrogen and non-glyphosate carbon source and a controlled pH. Further studies show that microbe recovery has a lag time of five days following glyphosate loading and three days following dormancy. These suggest that immobilized bacteria is potentially useful as an alternative method of industrial wastewater treatment.

Biodegradation, Glyphosate

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Death of the Escherichia coli K-12 strain W3110 in soil and water

Article Abstract:

The death of Escherichia coli K-12 strain decreases the plate count of W3110 in non sterile soil and water conditions as compared to sterile conditions. The death is due to a temperature dependent starvation induced phenomena rather than the cells passing into a viable but nonculturable (VBNC) state. However, the E. coli cells may pass through a transient VBNC state before dying. There is a decrease in plate count of E. coli at a temperature of 37 degrees celsius (C) in sterile fresh water, and 20 and 37 degrees C in sterile artificial sea water.

Analysis, Cell death, Escherichia coli, Water, Soils, Soil analysis, Water analysis

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A novel porous nylon biocarrier for immobilized bacteria

Article Abstract:

A highly porous nylon biocarrier that supports immobilized bacteria in bioreactors used to treat liquid wastes has been developed from nylon 6,6 using glass fiber for reinforcement. Microbes colonize all the accessible pores of width up to 3.9 mm, specially those that are in the 100-1,200 micron range. A bench-scale packed-bed reactor attains a removal rate of 5.95 kg of p-nitrophenol (PNP) /cubic meter/day, for wastes with a PNP content of 1,200 mg/liter. The complete mixing of the biocarrier with air injection removes excess surface biomass.

Observations, Nylon

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