Đánh giá kinh tế-kỹ thuật về việc nuôi trồng vi tảo trong một photobioreactor dạng ống để sản xuất thực phẩm trong khí hậu lục địa ẩm

Springer Science and Business Media LLC - Tập 23 - Trang 1475-1492 - 2021
S. Schade1, T. Meier1
1Institute for Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg, Halle (Saale), Germany

Tóm tắt

Cá, nguồn chính cho axit béo thiết yếu n-3 eicosapentaenoic acid (EPA) và docosahexaenoic acid (DHA), không thể đáp ứng nhu cầu toàn cầu cho những chất dinh dưỡng quan trọng này, dẫn đến một khoảng trống cung ứng hiện tại lên tới 1.1 triệu tấn EPA + DHA mỗi năm. Việc khai thác thêm nguồn cá tự nhiên liên quan đến thiệt hại lớn cho hệ sinh thái. Vi tảo dầu là nguồn tự nhiên cho EPA và DHA và có thể góp phần vào việc thu hẹp khoảng trống này. Việc nuôi trồng trong các photobioreactor (PBR) ở khí hậu 'lạnh' cho thấy vi tảo so với cá nuôi trồng đều có những lợi thế nhất định. Nghiên cứu hiện tại đánh giá tiềm năng kinh tế của vi tảo cho thực phẩm trong mô hình hệ thống như vậy. Đánh giá kinh tế-kỹ thuật được thực hiện trên cơ sở mô hình hệ thống động cho việc nuôi trồng Nannochloropsis sp. ở quy mô công nghiệp tại miền trung Đức trong khoảng thời gian 30 năm. Giá trị hiện tại ròng (NPV) và tỷ suất hoàn vốn (ROI) đã được xác định cho một số kịch bản trong đó các thông số kỹ thuật và kinh tế khác nhau. Xét đến kích thước của PBR được xem xét, việc nuôi trồng Nannochloropsis sp. tạo ra một NPV dương là 4.5 triệu euro sau 30 năm, tương ứng với một ROI hàng năm là 1.87%. Phân tích độ nhạy tổng thể tạo ra các ROI hàng năm trong khoảng từ 1.12 đến 2.47%. Chi phí lớn bao gồm cơ sở hạ tầng PBR, chi phí bảo trì và lao động. Một mùa vụ kéo dài thêm bốn tuần đã làm cho NPV vượt trội gần một phần ba (32%). Việc tăng giá bán lên 15% đã dẫn đến NPV cao hơn 47%. So với cá hồi Đại Tây Dương (Salmo salar) được nuôi trong ao, chất lượng EPA từ Nannochloropsis sp. đã giúp giảm khoảng một nửa chi phí nuôi trồng (− 44 đến − 60%). Trong nghiên cứu này, chúng tôi có thể chứng minh rằng vi tảo từ việc nuôi trồng tự dưỡng ánh sáng không chỉ có tiềm năng cung cấp chất dinh dưỡng thiết yếu cho con người, mà còn là một khoản đầu tư hấp dẫn, ngay cả trong khí hậu 'lạnh' nơi việc nuôi trồng không thể diễn ra quanh năm.

Từ khóa

#vi tảo #axit béo thiết yếu #eicosapentaenoic acid #docosahexaenoic acid #đánh giá kinh tế-kỹ thuật #photobioreactor #nuôi trồng thủy sản #khí hậu lục địa ẩm

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