The transformation of typical heavy metals during the process for magnetic harvesting and subsequent liquefaction in ethanol of microalgae

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts Pub Date : 2024-10-22 DOI:10.1016/j.algal.2024.103766

Luqiu Lin , Jianhui Zeng , Chuxuan Zhang , Zhengkang Peng , Xun Gong

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Abstract

This study reports the transformation of three typical heavy metals (As(III), Hg(II), and Pb(II)) during the process for magnetic harvesting and subsequent liquefaction in ethanol of microalgae. The magnetic harvesting process of Chlorella Vulgaris (CV) was simulated using a co-precipitation method, achieving the highest magnetic harvesting ratio of 98.95 % at a pH of 8 and an iron-algae ratio of 0.4 g/g. Then the magnetically harvested CV was subjected to liquefaction in ethanol to explore the speciation and migration of As(III), Hg(II), and Pb(II). The environmental risk assessment of above three heavy metals in the bio-oil and biochar was assessed according to the Risk Assessment Code (RAC). Hg(II) and Pb(II) were found to be effectively stabilized and immobilized in the biochar, while As(III) exhibited a propensity to migrate into the bio-oil and existed mostly in the dangerous speciation such as fraction associated with Fe and Mn oxides and fraction bound to organic matter. It reflects a high environmental risk and necessitates a pre-removal treatment.

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微藻磁力收割和随后乙醇液化过程中典型重金属的转化

本研究报告了三种典型重金属（As(III)、Hg(II)和Pb(II)）在微藻磁性收获和乙醇液化过程中的转化。采用共沉淀法模拟了小球藻（CV）的磁性收获过程，在 pH 值为 8 和铁藻比为 0.4 g/g 的条件下，最高磁性收获率达到 98.95%。然后，将磁性收获的 CV 在乙醇中进行液化，以探究 As(III)、Hg(II) 和 Pb(II) 的种类和迁移情况。根据风险评估准则（RAC）对生物油和生物炭中的上述三种重金属进行了环境风险评估。结果发现，汞（II）和铅（II）在生物炭中得到了有效的稳定和固定，而砷（III）则表现出迁移到生物油中的倾向，并主要以危险的形态存在，如与铁和锰氧化物相关的部分以及与有机物结合的部分。这反映了较高的环境风险，需要进行预去除处理。

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来源期刊

Algal Research-Biomass Biofuels and Bioproducts BIOTECHNOLOGY & APPLIED MICROBIOLOGY-

CiteScore

9.40

自引率

7.80%

发文量

332

期刊介绍： Algal Research is an international phycology journal covering all areas of emerging technologies in algae biology, biomass production, cultivation, harvesting, extraction, bioproducts, biorefinery, engineering, and econometrics. Algae is defined to include cyanobacteria, microalgae, and protists and symbionts of interest in biotechnology. The journal publishes original research and reviews for the following scope: algal biology, including but not exclusive to: phylogeny, biodiversity, molecular traits, metabolic regulation, and genetic engineering, algal cultivation, e.g. phototrophic systems, heterotrophic systems, and mixotrophic systems, algal harvesting and extraction systems, biotechnology to convert algal biomass and components into biofuels and bioproducts, e.g., nutraceuticals, pharmaceuticals, animal feed, plastics, etc. algal products and their economic assessment