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Original Articles

Microencapsulation of Bacillus megaterium NCT-2 and its effect on remediation of secondary salinization soil

, , , , , , & show all
Pages 134-143 | Received 24 Jun 2019, Accepted 06 Dec 2019, Published online: 06 Jan 2020
 

Abstract

Aim: To prolong the shelf life of Bacillus megaterium NCT-2 by preparing microcapsules through spray drying, and evaluate their efficiency in secondary salinisation soil remediation.

Methods: The wall material and spray drying conditions were optimised. Morphological characteristics of microcapsule were measured, and soil remediation effects were tested under field conditions.

Results: A relatively higher survival rate of B. megaterium microcapsule was obtained with 1:1 of chitosan/maltodextrin (w/w) when spray drying was performed at 150.0 °C, with the feed flow rates of 800 mL h−1 and 1000 mL h−1, respectively. The span value of 0.93 ± 0.01 was obtained under above conditions. Microcapsule survival rate was 64.09 ± 0.12% after 6 months of storage. Moreover, microcapsule successfully decreased NO3 and EC value in strongly saline soil by 46.5 ± 1.48% and 45.2 ± 1.51%, respectively.

Conclusion: Bacillus megaterium NCT-2 microcapsules have application potential in the remediation of secondary salinisation soil.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This research was supported by the National Key Research and Development Programme [2016YFD0800803], the National Nature Science Foundations of China [31702003], Young Elite Scientists Sponsorship Programme by CAST [2017QNRC001], Sponsored by “Chenguang Program” supported by Shanghai Education Development Foundation and Shanghai Municipal Education Commission [17CG07], Project funded by China Postdoctoral Science Foundation [2019M651505] and Yunnan expert workstation [2017IC071].

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