Heavy metal control in microalgae cultivation with power plant flue gas entering into raceway pond
- PDF / 498,022 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 43 Downloads / 191 Views
ENVIRONMENTAL TOXICOLOGY AND BIOGEOCHEMISTRY OF ECOSYSTEMS
Heavy metal control in microalgae cultivation with power plant flue gas entering into raceway pond Jing Sun 1,2 & Jun Cheng 2 & Zongbo Yang 2 & Junhu Zhou 2 Received: 10 December 2019 / Accepted: 24 February 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The heavy metal sources of large-scale raceway pond microalgae cultivation with flue gas were investigated to reduce heavy metal contents in microalgae during cultivation. The microalgae were cultivated with power plant flue gas (as C source) and circulating cooling seawater (added with N and P nutrients) for 6 days. The Pb, Cd, Hg, and As contents in microalgae were 0.91, 0.22, 0.08, and 0.28 ppm, respectively, which are nearly within the available national standard for food-grade microalgae. The heavy metal contents in microalgae with two membrane materials, namely, elastic polyethylene and random copolymer polypropylene, barely increased. The Hg, As, and Pb contents in microalgae cells cultivated with pure CO2 were 16.67%, 69.23%, and 70.33% that of cells cultivated with CO2 from flue gas. The Pb, As, and Hg contents in cells cultivated with fresh water were reduced by 38.46%, 15.38%, and 37.50%, respectively, compared with those cultivated with seawater. The heavy metal contents in microalgae were further reduced and controlled. Keywords Microalgae . Heavy metal . Raceway ponds
Introduction The prevention and remediation of heavy metal pollution have become a major research issue in recent years (Kim et al. 2013). The treatment of heavy metal–polluted water bodies via algal biosorption process has many advantages (Dekhil et al. 2011). Microalgae biomass can produce high valueadded products and achieve high economic benefits (Maity et al. 2014). However, the concentration of heavy metals in water enriched with microalgae cells is high, resulting in overproof heavy metal contents in algae cells. The four heavy metals in microalgae biomass with a specified limit content in the international standard are Pb, Cd, Hg, and As. Responsible Editor: Philippe Garrigues Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11356-020-08220-6) contains supplementary material, which is available to authorized users. * Jun Cheng [email protected] 1
Ningbo University of Finance & Economics, Ningbo, People’s Republic of China
2
Zhejiang University, Hangzhou, People’s Republic of China
Ibrahim (2011) studied the adsorption of heavy metal ions from water by using red algae. When the contact time of algae and heavy metal ions was 60 min, algal concentration was 10 g/L, the pH value was 5, and the maximum available metal ion adsorption capacity was 105.2 mg/g. Zhou et al. (2017) studied the performance characteristics of Cd2+ adsorption in water by living microalgae. The adsorption of Cd2+ by Scenedesmus quadricauda was high, whereas that by Spirulina platensis was low even though it exhibited strong affinity toward Cd2+. However, the adsorption of
Data Loading...
