Pollutants from fish feeding recycled for microalgae production as sustainable, renewable and valuable products

Nov 16, 2018Environmental science and pollution research international

Using Fish Waste to Grow Microalgae for Sustainable and Valuable Products

AI simplified

Circadian Biology on OpenScience ↗PubMed ↗DOI ↗

Abstract

Microalgae such as Chlorella saccharophila and Nannochloropsis sp. can produce oil content ranging from 10.7 to 13.6%.

Trash fish feeding can leach pollutants like ammonia and phosphate into marine environments.
Recycling wastewater from trash fish feeding could reduce this pollution and facilitate microalgae cultivation.
Microalgae are promising for producing renewable products including feed, biofuel, and industrial materials.
The mean calorific value of microalgae biofuel can reach 5364 Cal/g for Chlorella saccharophila and 6132 Cal/g for Nannochloropsis sp..
Utilizing microalgae for biofuel does not compete with land crops for food production.
De-oiled biomass from microalgae can be converted into sustainable products like bioplastics and bioasphalt.

AI simplified

Trash fish feeding of cage fish can result in marine pollution. Whole and chopped trash fish can leach pollutants such as ammonia, phosphate and protein into surrounding waters. Reduction of pollution can be achieved by recycling the wastewater generated from trash fish feeding for cultivation of microalgae. Microalgae are potent candidates for the production of renewable and sustainable products such as feed and food, health and pharmaceutical, cosmeceutical, industrial products, and biofuel. Two microalgae, Chlorella saccharophila and Nannochloropsis sp., have the potential to produce high amounts of polyunsaturated fatty acids. Furthermore, high oil content ranging from 10.7 to 13.6% is found in Chlorella saccharophila and up to 9.3% for Nannochloropsis sp. Moreover, these microalgae can also be utilized as a biofuel to give a mean calorific value of 5364 Cal/g which is higher than that of wood for Chlorella saccharophila and 6132 Cal/g which is equivalent to that of coal for Nannochloropsis sp. An alternative biofuel derived from microalgae is feasible due to the fact that they do not compete for arable land for cultivation and land crops for feed and food. This study discusses the synergistic coupling of microalgae mass production with wastewater treatment and carbon sequestration potential for mitigation of environmental impacts and a technically viable alternative energy resource. Additionally, the de-oiled biomass byproduct after oil extraction or its whole biomass can be converted into sustainable and renewal industrial products such as bioplastic, biopaint, bioasphalt, and biobuilding components.

Full Text

Full text is available at the source.

View full text (HTML) ↗View full text (PDF) ↗

Pollutants from fish feeding recycled for microalgae production as sustainable, renewable and valuable products

Abstract

Full Text

You found one interesting study. We’ll send the next 7.

what lands in your inbox each week:

Recent issues from the circadian biology brief