کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4435554 | 1620220 | 2016 | 8 صفحه PDF | دانلود رایگان |
• Cement stabilisation is combined with bioaugmentation for drill cuttings treatment.
• The technique can handle hydrocarbons and metals in drill cuttings simultaneously.
• The importance of the type versus quantity of bacteria for biodegradation is shown.
• The source and level of nutrients are vital to biodegradation by embedded microbes.
• Bioaugmenting granulated cement-stabilised monoliths increases contaminant losses.
Petroleum drill cuttings are usually treated by techniques suitable for particular contaminant groups. The significance of this study consists in the development of a treatment technology that can simultaneously handle the hydrocarbon and metal constituents of drill cuttings. Bioaugmentation is combined with stabilisation/solidification (S/S), within S/S monoliths and in granulated S/S monoliths. Portland cement was used for S/S treatment at 30% binder dosage. Bioaugmentation treatment involved two bacterial densities of a mixed culture bio-preparation. The effects of inclusion of compost, fertiliser and activated carbon were also evaluated. After 28 days, the combined S/S and bioaugmentation treatments recorded up to 15% higher total petroleum hydrocarbon (TPH) loss than control S/S treatment without bioaugmentation. Embedding fertiliser, activated carbon and higher bacterial density within S/S monoliths resulted in the highest (99%) TPH reduction but higher concentrations of metals. The addition of compost and lower bacterial density to granulated S/S monoliths led to similar (98%) TPH degradation and lower amounts of metals. The results suggest that with better mixture optimisation, combining S/S and bioaugmentation could engender more sustainable treatment of drill cuttings.
Journal: Applied Geochemistry - Volume 71, August 2016, Pages 1–8