Clean Style Recovery and Utilization of Residual Nutrients in Effluents From Biohydrogen Production: In Situ Immobilization Based on Sodium Alginate

Frontiers in Bioengineering and Biotechnology - Tập 10
Fuke Ai1,2, Yang Zhang2, Xiaoni Fan2, Yameng Li2, Haorui Zhang1,2, Yinggang Jiao2, Quanguo Zhang2, Cheng Yong1, Jinfei Zhao3, Francesco Petracchini4, Valerio Paolini4, Zhiping Zhang2
1Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, China
2Key Laboratory of New Materials and Facilities for Rural Renewable Energy, MOA of China, Henan Agricultural University, Zhengzhou, China
3Key Laboratory of Modern Agricultural Engineering of Xinjiang Higher Education Institutions, Alar, China
4National Research Council of Italy- Institute of Atmospheric Pollution Research, Rome, Italy

Tóm tắt

Clean- and high-value recovery and reuse of the residue of biohydrogen production (biohydrogen slurry) is an urgent problem to be solved. In this study, sodium alginate (SA) gel was used to concentrate nutrients quickly in situ from biohydrogen slurry, which was prepared into gel microspheres (GMs), just like “capsule.” The immobilization and release efficiency of conventional and reverse spherification were investigated. Better immobilization and release efficiency were detected under the conventional spherification method. The effect of GM sizes and concentrations of SA and calcium chloride (CaCl2) was further studied in terms of sphericity factor, nutrient release, yield, encapsulation efficiency, and loading capacity. The best immobilization effect was obtained with a 1.6-mm syringe needle, 3.0 wt% SA, and 6 wt% CaCl2, in which the sphericity factor, nitrogen release, yield, nitrogen encapsulation efficiency, and nitrogen loading capacity reached to 0.047, 96.20, 77.68, 38.37, and 0.0476%, respectively. This process not only avoids environmental pollution from biohydrogen slurry but also uses them at a high value as a fertilizer to nourish the soil. The feasibility of “slurry capsule” preparation will realize the clean recovery and reuse of biohydrogen slurry, which provides a new idea for ecological protection and carbon neutral goals and has important significance for sustainable development.

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Frontiers in Bioengineering and Biotechnology

Tập 10

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