HUHao,MARong,WUSi,et al.Treatment of High-salinity Food Processing Wastewater by Salt-tolerant Microalgae for Fatty Acid Production[J].China Water & Wastewater,2026,42(7):86-92.
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Treatment of High-salinity Food Processing Wastewater by Salt-tolerant Microalgae for Fatty Acid Production

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第42卷 Number: 第7期 Page: 86-92 Column: Date of publication: 2026-04-01
Author(s):
HU　Hao1; 2;  MA　Rong1;  WU　Si1;  WU　Banglei1;  LI　Zhenghao3;  LI　Zhengang4;  HUANG　Xianhuai1; 2
（1. School of Environmental and Energy Engineering， Anhui Jianzhu University， Hefei 230601 China； 2. Anhui Provincial Key Laboratory of Environmental Pollution Control and Resource Reuse， Hefei 230601， China； 3. Department of Environmental Science and Engineering， University of Science and Technology of China， Hefei 230026， China； 4. Fuyang City Water Supply Co. Ltd.， Fuyang 236069， China）
Keywords:
salt-tolerant microalgae;  high-salinity food processing wastewater;  fatty acid;  sodium lactate;  resource recovery
Abstract:
The application of salt-tolerant microalgae for the treatment of high-salinity food processing wastewater coupled with fatty acid production holds significant promise. However, the performance of different salt-tolerant microalgae species in the resource-oriented treatment of such wastewater varies considerably. This study investigated the growth performance, pollutants removal efficiency, and fatty acid production potential of three microalgae species—Nannochloropsis oceanica, Phaeodactylum tricornutum, and Isochrysis galbana—under varying concentrations of sodium lactate. The results showed that all three microalgae exhibited optimal growth at a sodium lactate concentration of 2.540 g/L, with Phaeodactylum tricornutum achieving the highest biomass (1.59 g/L). Phaeodactylum tricornutumdemonstrated the most efficient pollutant removal, achieving ammonia nitrogen and nitrate nitrogen removal rates of 79% and 99%, respectively, by the second day of cultivation, with final removal rates reaching 72% and 99%, respectively. The removal rates for both PO43--P and sodium lactate reached 100% by the end of the experiment. The fatty acid contents of Nannochloropsis oceanica and Phaeodactylum tricornutum were 37.31% and 36.85% of cell dry weight, with unsaturated fatty acids accounting for 54% and 48% of the total fatty acids, respectively. Collectively, these findings indicate that Phaeodactylum tricornutum exhibits superior performance in pollutants removal and resource recovery from high?salinity food processing wastewater, providing a foundation for the application of resource-oriented treatment technologies for high-salinity wastewater.
Last Update: 2026-04-01