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| Study on oil-spilled water treated by bio-modification of corn stalks |
| Received:August 29, 2017 Revised:October 17, 2017 |
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| KeyWord:corn stalk;wastewater;sorption;oil;modification |
| Author Name | Affiliation | E-mail | | PENG Dan | School of Traffic & Environment, Shenzhen Institute of Information Technology, Shenzhen 518172, China | | | DANG Zhi | School of Environment and Energy, South China University of Technology, Guangzhou 510006, China | | | ZHENG Liu-chun | School of Chemistry and Environment, South China Normal University, Guangzhou 510006, China | lczhengscnu1@163.com |
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| Abstract: |
| Oil-spilled wastewater has resulted in many environmental and ecological problems all over the world. In this work, we have developed a new biotechnological procedure by using solid state fermentation and enzymes to produce a biodegradable oil-sorbent from corn stalk. After treatment with 100 U·g-1 cellulase for 6 h at 45℃, the obtained cellulose-modified corn stalk exhibited high sorption capacity of oils. Aspergillus niger was used for the solid-state fermentation of corn stalk, and the maximum oil sorption could be achieved after 6 days modification, with a solid-liquid ratio of 1:3, and a modification temperature of 30℃. SEM was used to characterize the morphology and structural characteristics of the modified and unmodified corn stalks, along with XRD and BET for analyzing changes in crystallinity and surface area. Batch sorption experiments were conducted to investigate the effects of sorbent dose(0.1~0.5 g) and initial oil amount(5~30 g) on the oil sorption capacity. Sorption kinetics was also studied using different kinetic models. The results showed that the sorption of crude oil on modified corn stalk reached equilibrium at 60 min, and the sorption kinetics could be well described by the pseudo-second-order model. The results also indicated that the modification of corn stalk using solid state fermentation and enzyme is an efficient means of producing environment-friendly oil sorbents. |
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