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Abstract
Poultry litter extract (PLE) was treated using a microbial consortium dominated by the filamentous cyanobacterium Leptolyngbya sp. in synergy with heterotrophic microorganisms of the poultry waste. Laboratory- and pilot-scale experiments were conducted under aerobic conditions using suspended and attached growth photobioreactors. Different dilutions of the extract were performed, leading to different initial pollutant (nitrogen, phosphorus, dissolved chemical oxygen demand (d-COD), total sugars) concentrations. Significant nutrient removal rates, biomass productivity, and maximum lipid production were determined for all the systems examined. Higher d-COD, nitrogen, phosphorus, and total sugars removal were recorded in the attached growth reactors in both laboratory- (up to 94.0%, 88.2%, 97.4%, and 79.3%, respectively) and pilot-scale experiments (up to 82.0%, 69.4%, 81.0%, and 83.8%, respectively). High total biomass productivities were also recorded in the pilot-scale attached growth experiments (up to 335.3 mg L−1d−1). The produced biomass contained up to 19.6% lipids (w/w) on a dry weight basis, while the saturated and monounsaturated fatty acids accounted for more than 70% of the total fatty acids, indicating a potential biodiesel production system. We conclude that the processing systems developed in this work can efficiently treat PLE and simultaneously produce lipids suitable as feedstock in the biodiesel manufacture.
Highlights
The poultry industry generates large amounts of poultry litter (PL) rich in organic and inorganic nutrients such as carbon, nitrogen, phosphorus, potassium and calcium [1,2]
PL can be used as a rich nutrient source for microalgae/cyanobacteria cultivation, while the produced biomass can serve as a biofuel feedstock [4]
A microbial consortium obtained from the secondary treatment tank of the municipal wastewater treatment plant of Agrinio city was used as inoculum for PL extract (PLE) treatment
Summary
The poultry industry generates large amounts of poultry litter (PL) rich in organic and inorganic nutrients such as carbon, nitrogen (mainly in the form of NH4+), phosphorus, potassium and calcium [1,2]. Specific wastes can be a suitable growth medium for microalgal cultivation as they provide abundant biomass at low cost, without requiring additional nutrient input [24]. Attached cultivation systems can offer several advantages over conventional cultivation techniques in which microalgae are suspended in liquid medium, including higher biomass productivity, higher wastewater treatment efficiency, better light availability, and easier harvesting [26,28]. A Leptolyngbya-based microbial consortium (isolated from wastewater) was applied to treat PLE and simultaneously produce biodiesel using laboratory- and pilot-scale photobioreactors. Laboratory- and pilot-scale experiments were conducted in suspended and attached growth systems to study their ability to remove organic load and nutrients in different photobioreactors at various operating conditions and simultaneously producing lipids for biodiesel. Nutrient removal efficiency, and lipid content were determined and the Leptolyngbya-based microbial community was analyzed microscopically
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