Simultaneous improvements on nutrient and Mg recoveries of microalgal bioremediation for municipal wastewater and nickel laterite ore wastewater

[Display omitted] •Introduction of NLOWW into MW improved microalgal growth and nutrient removal.•High ROS levels due to high Mg2+ inhibited microalgal growth.•Mg2+ from NLOWW was primarily removed by absorption and attachment.•Carbohydrate content was positively related to the Mg2+ loading.•Economi...

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Bibliographic Details
Published in:Bioresource technology 2020-02, Vol.297, p.122517-122517, Article 122517
Main Authors: Chen, Zhipeng, Qiu, Shuang, Amadu, Ayesha Algade, Shen, Yeting, Wang, Lingfeng, Wu, Zhengshuai, Ge, Shijian
Format: Article
Language:English
Subjects:
Biodegradation, Environmental
Biomass
Biomass production
Chlorella
Magnesium
Microalgae
Nickel
Nitrogen
Nutrient removal
Nutrients
Phosphorus
Waste Water
Wastewater
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Summary:[Display omitted] •Introduction of NLOWW into MW improved microalgal growth and nutrient removal.•High ROS levels due to high Mg2+ inhibited microalgal growth.•Mg2+ from NLOWW was primarily removed by absorption and attachment.•Carbohydrate content was positively related to the Mg2+ loading.•Economic model demonstrated techno-economic feasibility. Effects of different mixing ratios between synthetic municipal wastewater (MW) and magnesium (Mg2+)-enriched nickel laterite ore wastewater (NLOWW) on growth of Chlorella sorokiniana (C. sorokiniana), photosynthetic activities, cellular biocomposition, nutrient and Mg2+ removal were investigated in photobioreactors. In the culture without NLOWW, wrinkled cells were observed with low biomass production. The culture mixed with 0.13% NLOWW obtained 1.89-fold higher biomass yield, 3.77-fold enhanced photosynthetic activity (Fv/Fm value), and improved nutrient removal (nitrogen by 102.2%, phosphorus by 39.3%). However, excessive Mg2+ at 100% NLOWW produced highest reactive oxygen species suppressing microalgal growth. The Mg2+ removal capacity increased with NLOWW loading. Moreover, microalgal assimilation primarily contributed to nutrient removal while absorption was the dominant Mg2+ removal pathway. Carbohydrate content in biomass increased with Mg2+ loading. Finally, the approach for MW/NLOWW treatment was demonstrated as economically feasible with revenue of $75.6 per kilogram biomass through a comprehensive economic model.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2019.122517