Abstract
Shortage of water, energy, and bioresources in the world has led to the exploration of new technologies that achieve resource recovery from wastewater, which has become a new sustainable trend. Photosynthetic non-sulfur bacteria (PNSB), the most ancient photo microorganism, not only treats different wastewater types, but also generates PNSB cells, which are non-toxic bioresources and containing many value-added products. These bioresources can be used as raw materials in the agricultural, food, and medical industries. Therefore, PNSB or PNSB-based wastewater resource recovery technology can be simultaneously used to treat wastewater and produce useful bioresources. Compared with traditional wastewater treatment, this technology can reduce CO2 emissions, promote the N recovery ratio and prevent residual sludge disposal or generation. After being developed for over half a century, PNSB wastewater resource recovery technology is currently extended towards industrial applications. Here, this technology is comprehensively introduced in terms of (1) PNSB characteristics and metabolism; (2) PNSB wastewater treatment and bioresource recovery efficiency; (3) the relative factors influencing the performance of this technology, including light, oxygen, strains, wastewater types, hydraulic retention time, on wastewater treatment, and resource production; (4) PNSB value-added bioresources and their generation from wastewater; (5) the scale-up history of PNSB technology; (6) Finally, the future perspectives and challenges of this technology were also analysed and summarised.
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Acknowledgements
This work is supported by National Scientific Foundation of China (Grant Nos. 52070067 and 518611255103) and Open Project of Key Laboratory of Environmental Biotechnology, CAS (Grant No. kf2020013).
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HL, writing and editing the draft. Drawing Figures, calculating, analyzing and summarizing the data of wastewater treatment and biomass production. GZ, providing financial support, revising the draft and providing the guidelines of the draft. SH, summarizing the data of value added products of PNSB from wastewater treatment processing and making table 3. RZ, summarizing the data of value added products of PNSB from wastewater treatment processing. DZ, providing market and application analysis.
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Lu, H., Zhang, G., He, S. et al. Purple non-sulfur bacteria technology: a promising and potential approach for wastewater treatment and bioresources recovery. World J Microbiol Biotechnol 37, 161 (2021). https://doi.org/10.1007/s11274-021-03133-z
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DOI: https://doi.org/10.1007/s11274-021-03133-z