Nutrient removal from piggery wastewater by Desmodesmus sp.CHX1 and its cultivation conditions optimization

Abstract

Combination of microalgae cultivation and piggery wastewater treatment has become a hot topic in recent years. Nutrient removal from aerated piggery wastewater (APW) by Desmodesmus sp. CHX1 and the optimization of cultivation conditions were investigated in this study. Results indicated that Desmodesmus sp. CHX1 showed an efficient growth in APW, with specific growth rate of 0.26-0.56 d. The biomass yield based on nutrient consumption was 9.65 g biomass/g NH-N and 209.15 g biomass/g total phosphorus (TP) respectively. Desmodesmus sp. CHX1 performed well in nutrient removal from APW, with ammonium nitrogen (NH-N) and TP removal efficiency (RE) of 78.46% and 91.66% respectively after 7 days of culture. Nutrient removal process fitted the pseudo-first-order kinetic equations well, with removal rate (RR) constant of 0.24 d for NH-N and 0.28 d for TP. The optimum conditions for nutrient removal from APW by Desmodesmus sp. CHX1 were light intensity of 150 μmol photons m s in the photoperiod for 24 h when the temperature was set at 35°C with alga cell inoculation concentration of 30%. The removal efficiencies of NH-N and TP were 88.26% and 95.06% respectively under the optimal conditions after 7 days of culture. Our results can be a good reference for enhancement of microalga production and the nutrient RE and further extend the application of the large-scale piggery wastewater treatment under a controlled environment.

Towards high-quality biodiesel production from microalgae using original and anaerobically-digested livestock wastewater

“…The average removal rates of NH 4 + -N were 1.76-7.92 mg/L/d in OPE, which were clearly higher than those (1.61-4.84 mg/L/d) from the DPE (Table S2). The removal rates achieved in this study agreed with previous studies (2.2-20 mg/L/d) of using other microalgae species for piggery wastewater treatment (Luo et al, 2019). Throughout the experiment, TN removal efficiencies were 42%, 80%, and 89% in 5%, 10% and 20%…”

Hydrothermal carbonization of microalgae for phosphorus recycling from wastewater to crop-soil systems as slow-release fertilizers

“…With the development of "Enhanced biological P removal", microalgae-based techniques are attracting increased attention because of the luxury uptake of P by microalgae, accumulating P up to 2-4% of their cell dry weight (Cabanelas et al, 2013;Santos and Pires, 2018;Luo et al, 2019). The cost of wastewater treatment must be counterbalanced with efficacy of P removal and production of microalgal biomass, which further produces a significant economic benefit to society (Prasad et al, 2014;Solovchenko et al, 2019).…”

“…Microalgae are capable of absorbing inorganic P in excess through storage within their cells in the form of polyphosphate granules (Delgadillo-Mirquez et al, 2016) (Solovchenko et al, 2019). Previous studies reported that microalgae can accumulate large quantities of P (up to 2-4% of their cell dry weight), and thus have potential to be applied as fertilizer after appropriate processing (Cabanelas et al, 2013;Santos and Pires, 2018;Luo et al, 2019). Therefore, reclaiming P from wastewater streams with microalgal cultures is a sustainable and environmental-friendly solution to the shortage of phosphate rock.…”

A Review on Eco-Restoration of Rivers with Special Focus on Industrial Wastewater Treatment

“…The presence of essential nutrients like carbon, nitrogen and phosphorus makes wastewater a suitable medium for microalgae cultivation (Luo et al, 2018). Nitrogen is important for microalgae growth as it aids formation of proteins, enzymes, ATP/ADP etc.…”