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Formulation of a liquid organic fertilizer from Chlorella sp. Grown in dairy effluent

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dc.contributor.author De Silva, A.H.A.T.E.
dc.contributor.author Gnanavelrajah, N.
dc.contributor.author Ketheesan, B.
dc.contributor.author Kajeevan, K.
dc.contributor.author Rivenderan, M.
dc.date.accessioned 2024-03-12T02:47:54Z
dc.date.available 2024-03-12T02:47:54Z
dc.date.issued 2024
dc.identifier.uri http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/10210
dc.description.abstract The necessity for natural or biological fertilizers instead of synthetic fertilizers arises from the growing demand for food and awareness of environmental pollution due to inorganic fertilizers. In order to increase crop productivity and create healthy plants, microalgae have emerged as a potential source of bio stimulants and biofertilizers in agriculture. Chlorella sp. has been identified as a potential bio-fertilizer. This study investigated the formulation of a liquid organic fertilizer (LOF) by using Chlorella sp. grown in dairy industry wastewater according to the Sri Lanka Standards Institution (SLSI) standards for LOF. The Chlorella sp. was cultivated in dairy waste water in a raceway reactor for 14 days continuously with constant light intensity and constant mixing to optimize the algal growth. The nutrient content of dry biomass of Chlorella sp. grown in dairy industry effluent was 5% nitrogen, 2.33% phosphorous and 2.68% potassium. The nutrient content of formulated Chlorella liquid organic fertilizer was 1% nitrogen (N), 0.58% phosphorous (P) and 0.67% potassium (K). pH and EC were 7.4 and 9.8 ds/m respectively. The trace metal content in the formulated LOF was 0.0047 ppm chromium (Cr) and 0.0023 ppm arsenic (As). Cadmium (Cd) and lead (Pb) were not detected. According to SLSI standards, the LOF should contain 6.0 – 8.5 pH, 20.0 ds/m EC (maximum), 1% total nitrogen, 0.5% total phosphorous, 0.5% total potassium in minimum, and 0.5 ppm chromium. Also, heavy metal concentration of LOF should be 0.5 ppm arsenic, 0.5 ppm cadmium and 1.0 ppm lead in maximum concentration. The formulated LOF using Chlorella sp. grown in dairy wastewater fulfilled the chemical requirements and trace metal requirements of SLSI recommendations. This study highlights the feasibility of formulating a liquid organic fertilizer using Chlorella sp. cultivated in dairy wastewater, aligning with the requirements outlined by SLSI standards. en_US
dc.language.iso en en_US
dc.publisher Eastern University, Sri Lanka en_US
dc.subject Biofertilizer en_US
dc.subject Chlorella sp en_US
dc.subject Dairy industry en_US
dc.subject Liquid organic fertilizer en_US
dc.subject Sri Lanka Standards Institution en_US
dc.subject Waste water en_US
dc.title Formulation of a liquid organic fertilizer from Chlorella sp. Grown in dairy effluent en_US
dc.type Article en_US


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