Pine sawdust as algal biofilm biocarrier for wastewater treatment and algae-based byproducts production

Zhang, Qi; Wang, Lin; Yu, Zhigang; Zhou, Ting; Gu, Zhiqiang; Huang, Qiaoyun; Xiao, Bo; Zhou, Wenguang; Ruan, Roger; Liu, Yuhuan

doi:10.1016/j.jclepro.2020.120449

Cited by 36 publications

(6 citation statements)

References 45 publications

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“…By using internal illumination to supply light to microalgae the surface area of the biofilm is whatever it is designed to be and the limitation is the cost of optical surfaces, cost of electricity, harvesting and processing biomass. Biofilms are well documented to be more resistant to environmental contaminants, and antibiotics, than planktonic microbial cells [ 34 , 75 ]. Accordingly, maintaining a diverse microalgae/bacterial population, growing as biofilm, will improve the stability of the wastewater treatment process.…”

Section: Why Are Biofilms Better Than Planktonic Cells (A More Detailed Discussion)?mentioning

confidence: 99%

Shining a Light on Wastewater Treatment with Microalgae

Kilbane

2022

Arab J Sci Eng

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Microalgae can produce biofuels, nutriceuticals, pigments and many other products, but commercialization has been limited by the cost of growing, harvesting and processing algal biomass. Nutrients, chiefly nitrogen and phosphorus, are a key cost for growing microalgae, but these nutrients are present in abundance in municipal wastewater where they pose environmental problems if not removed. This is not a traditional review article; rather, it is a fact-based set of suggestions that will have to be investigated by scientists and engineers. It is suggested that if microalgae were grown as biofilms rather than as planktonic cells, and if internal illumination rather than external illumination were employed, then the use of microalgae may provide useful improvements to the wastewater treatment process. The use of microalgae to remove nutrients from wastewater has been demonstrated, but has not yet been widely implemented due to cost, and because microalgae derived from wastewater treatment has not yet been demonstrated as a commercial source for value-added products. Future facilities are likely to be called Municipal Resource Recovery Facilities as wastewater will increasingly be viewed as a resource for water, biofuels, fertilizer, monitoring public health and value-added products. Advances in photonics will accelerate this transition.

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Section: Why Are Biofilms Better Than Planktonic Cells (A More Detailed Discussion)?mentioning

confidence: 99%

Shining a Light on Wastewater Treatment with Microalgae

Kilbane

2022

Arab J Sci Eng

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“…Meanwhile, the decrease of the HRT could lead to the increased nutrient loading rate of the system. Furthermore, increased nutrient loading rates could further enhance the nutrients uptake of microalgal cell [15,32], which might contribute to the increased nutrients removal rates of the system (Figure 5c,d). However, increased nutrient loading rate also increased the nutrients concentrations in the system, leading to a higher salinity as well as inhibitor (NH 4 + -N, NH 3 , etc.)…”

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confidence: 99%

Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

et al. 2020

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Fresh pig urine is unsuitable for microalgae cultivation due to its high concentrations of NH4+-N, high pH and insufficient magnesium. In this study, fresh pig urine was pretreated by dilution, pH adjustment, and magnesium addition in order to polish wastewater and produce microalgae biomass. Chlorella vulgaris was cultured in an in-house-designed light-receiving-plate (LRP)-enhanced raceway pond to treat the pretreated pig urine in both batch and continuous mode under outdoor conditions. NH4+-N and TP in wastewater were detected, and the growth of C. vulgaris was evaluated by chlorophyll fluorescence activity as well as biomass production. Results indicated that an 8-fold dilution, pH adjusted to 6.0 and MgSO4·7H2O dosage of 0.1 mg·L−1 would be optimal for the pig urine pretreatment. C. vulgaris could stably accumulate biomass in the LRP-enhanced raceway pond when cultured by both BG11 medium and the pretreated pig urine. About 1.72 g·m−2·day−1 of microalgal biomass could be produced and 98.20% of NH4+-N and 68.48% of TP could be removed during batch treatment. Hydraulic retention time of 7-9d would be optimal for both efficient nutrient removal and microalgal biomass production during continuous treatment.

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“…Plexiglass, poly(vinyl chloride)), 15 natural polymers (e.g. cotton, cork), 16 lignocellulosic materials (pine sawdust, rice husk) 17 and some others that have been modified using ultraviolet laser micromachining 18 . There is a trend in the literature that shows that hydrophobic materials perform better without this being the rule and without having given a clear answer about the selectivity of microalgae 16,19 .…”

Section: Introductionmentioning

confidence: 99%

Chlorococcum sp. biofilm growth on biochar from olive kernels solid support

Tsavatopoulou

Vakros

Manariotis

2023

J of Chemical Tech & Biotech

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BACKGROUND: Biofilm is a complex community of microorganisms including microalgae, bacteria and protozoa, which are adhered to a surface. The purpose of an integrated microalgal processing system is the production of biofuels, biomass and other valuable bioproducts as well as wastewater remediation. Biochar is a carbon-rich and porous substrate, capable of adsorbing nutrients.RESULTS: In this study, biochar produced from olive kernels pyrolyzed at 400 °C was tested as a solid support candidate for adhering Chlorococcum sp. cultures. The substrate used was BG-11 with 1/3 nitrates and BG-11 without nitrates and phosphates. After 15 days of cultivation, the biomass attached to biofilm was measured, while different parameters were determined in the liquid. Among the different concentrations of biochar used, the culture containing 1 g L −1 biochar gave the best performance, resulting in 1.28 and 1.24 g microalgae g −1 biochar in the presence and absence of nitrates, respectively. CONCLUSION: The cultures containing BG-11 without nitrogen and phosphorus showed leaching of nutrients in the liquid of the reactor. The present findings provide an alternative use of biochar, enhancing the growth of microalgae, and thus encouraging its use as supporting material in bioreactors.

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Pine sawdust as algal biofilm biocarrier for wastewater treatment and algae-based byproducts production

Cited by 36 publications

References 45 publications

Shining a Light on Wastewater Treatment with Microalgae

Shining a Light on Wastewater Treatment with Microalgae

Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

Chlorococcum sp. biofilm growth on biochar from olive kernels solid support

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