Cultivation of Brackish Water Microalgae for Pig Manure Liquid Digestate Recycling

Yung-Cheng Chang, Yen-Ju Pan, Tzu-Hsuan Huang, Ting-Hsun Hsiao, Liang-Yu Wei and Te-Hua Hsu ()
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Yung-Cheng Chang: Department of Aquaculture, National Taiwan Ocean University, Keelung 20224, Taiwan
Yen-Ju Pan: Department of Aquaculture, National Taiwan Ocean University, Keelung 20224, Taiwan
Tzu-Hsuan Huang: Livestock Management Division, Livestock Research Institute, Ministry of Agriculture, Tainan 71246, Taiwan
Ting-Hsun Hsiao: Livestock Management Division, Livestock Research Institute, Ministry of Agriculture, Tainan 71246, Taiwan
Liang-Yu Wei: Department of Environmental Biology and Fisheries Science, National Taiwan Ocean University, Keelung 20224, Taiwan
Te-Hua Hsu: Department of Aquaculture, National Taiwan Ocean University, Keelung 20224, Taiwan

Sustainability, 2023, vol. 15, issue 23, 1-14

Abstract: Sustainability and recycling of agricultural and animal husbandry waste are important. Pig manure contains relatively high concentrations of organic matter, such as nitrate-nitrogen, ammonia nitrogen, and phosphate, and a direct discharge can cause environmental pollution. This study successfully culturing four brackish water microalgae, including Tetraselmis chuii , Isochrysis galbana , Chlorella vulgaris , and Proteomonas sulcata, by using a diluted digestate solution of pig manure (NH 3 concentration is lower than 10 mg/L). These microalgae can reach their highest cell concentration within 3–7 days of cultivation. The small microalgae, C. vulgaris and I. galbana , reached a cell density of 2.5 × 10 7 and 1.5 × 10 7 , respectively, whereas lower cell densities were documented for large microalgae T. chuii (1.4 × 10 6 ) and P. sulcata (1.6 × 10 6 ). Our findings highlight the feasibility of sustainable treatment of animal manure using brackish water microalgae. These results provide opportunities to reduce freshwater usage and environmental pollutions, and support microalgae production for further aquaculture application.

Keywords: aquaculture; sustainability; algae; seawater; live feed (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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