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Implementation of UV-based advanced oxidation processes in algal medium recycling
Wenxuan Wang1, Jun Sha2, Zhiying Lu3
1Center for Microalgal Biotechnology and Biofuels, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; Nicholas School of the Environment, Duke University Marine Laboratory, Beaufort, NC 28516, USA.
The Science of the Total Environment
|April 9, 2018
Summary
Recycling algae culture media is crucial for sustainable bioproducts. UV/peroxydisulfate (PDS) and UV/hydrogen peroxide (H2O2) effectively treat algal organic matter, converting inhibitors into nutrients for improved algae growth.
Area of Science:
- Environmental Science
- Biotechnology
- Chemical Engineering
Background:
- Algal biomass is a sustainable feedstock for bioproducts.
- Algal culture media recycling is essential due to water consumption, economic, and environmental concerns.
- Recycled media can contain inhibitory organic matter requiring pre-treatment.
Purpose of the Study:
- To investigate UV-based advanced oxidation processes (AOPs) for degrading algal organic matter (AOM) in culture media.
- To evaluate the effectiveness of UV, UV/PDS, UV/H2O2, and UV/NH2Cl in treating AOM.
- To assess the impact of treated media on algae growth and identify a sustainable recycling strategy.
Main Methods:
- Direct UV photolysis, UV/peroxydisulfate (PDS), UV/hydrogen peroxide (H2O2), and UV/chloramine (NH2Cl) were employed.
- Specific UV absorbance (SUVA) was measured to assess organic matter changes.
- Fluorescence excitation-emission matrix (EEM) coupled with parallel factor analysis (PARAFAC) analyzed AOM fractions.
- Powder activated carbon (PAC) absorption and algae growth assays were conducted.
Main Results:
- All UV-based AOPs reduced SUVA, indicating AOM degradation.
- UV/PDS and UV/H2O2 treatments degraded significant portions of fulvic-like and humic-like fractions.
- Treated media using UV/PDS and UV/H2O2 removed growth inhibitors and supported algae growth.
- These processes converted inhibitory AOM into a nutrient source for algae.
Conclusions:
- UV/PDS and UV/H2O2 are effective in degrading hydrophobic AOM components.
- These AOPs offer a sustainable approach for algae culture media recycling by utilizing, not just removing, AOM.
- This innovative pre-treatment strategy enhances resource recovery and promotes algae growth in recycled media.
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