pH treatments in continuous cultivation to maximize microalgal production and nutrient removal from anaerobic digestion effluent of aquatic macrophytes

Qian, Jun; Liu, Xin; Ban, Syuhei; Fujiwara, Masaaki; Kodera, Toshimitsu; Akizuki, Shinichi; Toda, Tatsuki

doi:10.1007/s10811-020-02196-z

Cited by 14 publications

(2 citation statements)

References 70 publications

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“…One algal strain used for ADPE remediation was isolated from a local water body surrounding the Nanchang Maiyuan Landfill Plant and named Nanchang University (NCU)-7, which was identified as Chlorella sorokiniana , based on our previous methods ( Li et al, 2022 ). C. sorokiniana has been widely applied in wastewater remediation because it can achieve high biomass production and nutrient removal in mixotrophic cultivation ( León-Vaz et al, 2019 ; Qian et al, 2020 ; Qian et al, 2021 ).…”

Section: Methodsmentioning

confidence: 99%

Enhancing algal growth and nutrient recovery from anaerobic digestion piggery effluent by an integrated pretreatment strategy of ammonia stripping and flocculation

Qian

Song

et al. 2023

Front. Bioeng. Biotechnol.

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Anaerobic digestion piggery effluent (ADPE) with a quite high ammonium (NH4+) concentration and turbidity (dark brown color) generally requires high dilution before microalgae cultivation, owing to its NH4+ toxicity and color inhibition to algal growth. An integrated pretreatment strategy of ammonia stripping and chemical flocculation may be a more practical pretreatment procedure for enhancing algae yield and nutrient recovery from anaerobic digestion piggery effluent. In this study, we determined the optimum pretreatment strategy of anaerobic digestion piggery effluent for subsequent microalgae cultivation and nutrient recovery. The results showed that the integrated anaerobic digestion piggery effluent pretreatment strategy of high-temperature ammonia stripping and chemical flocculation at a mixed dosage of 2 g L−1 polyaluminum chloride (PAC) and 40 mg L−1 cationic polyacrylamide (C-PAM), and 50 mg L−1 ammonium nitrogen (NH4+-N) enrichment provided maximum algal yield (optical density = 1.8) and nutrient removal (95.2%, 98.7%, 99.3%, and 78.5% for the removal efficiencies of total nitrogen, NH4+-N, total phosphorus, and chemical oxygen demand, respectively) from anaerobic digestion piggery effluent. The integrated pretreatment strategy is expected to become a more practical pretreatment procedure for enhancing algae yield and nutrient recovery from anaerobic digestion piggery effluent.

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Section: Methodsmentioning

confidence: 99%

Enhancing algal growth and nutrient recovery from anaerobic digestion piggery effluent by an integrated pretreatment strategy of ammonia stripping and flocculation

Qian

Song

et al. 2023

Front. Bioeng. Biotechnol.

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“…2022, 12, 4741 2 of 16 AD effluent (ADE) from piggery (ADPE), the byproduct of anaerobic microorganism degradation of organics from piggery wastewater, is enriched in high levels of organic and inorganic compounds, heavy metals, antibiotics, and hormones [5]. Microalgae is a group of unicellular organisms with excellent performance in nutrient assimilation and value-added biomass accumulation during growth, widely applied for the treatment of municipal, agricultural, and industrial wastewaters [6][7][8][9][10], including ADPE [11]. For example, Debowski et al [9] reported that a mixed-culture microalgae showed effective biomass production (3 g L −1 ) and high nutrient removal rates in ADE from dairy wastewater, reaching above 90% of organic compound and nutrient removal.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Algal Yield and Nutrient Removal from Anaerobic Digestion Piggery Effluent by an Integrated Process-Optimization Strategy of Fungal Decolorization and Microalgae Cultivation

et al. 2022

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The dark brown anaerobic digestion piggery effluent (ADPE) with a large amount of ammonium generally needs high dilution before microalgae cultivation due to its inhibiting effects on algal growth. Due to the strong decolorization of fungi by degrading organic compounds in wastewater, the process-optimization integrated strategy of fungal decolorization of ADPE and subsequent microalgae cultivation with ammonium-tolerant strain may be a more reliable procedure to reduce the dilution ratio and enhance algal biomass production, and nutrient removal from ADPE. This study determined a suitable fungal strain for ADPE decolorization, which was isolated and screened from a local biogas plant, and identified using 26s rRNA gene sequence analysis. Subsequently, ADPE was pretreated by fungal decolorization to make low-diluted ADPE suitable for the algal growth, and conditions of microalgae cultivation were optimized to achieve maximum algal yield and nutrient removal from the pretreated ADPE. The results showed one promising locally isolated fungal strain, Nanchang University-27, which was selected out of three candidates and identified as Lichtheimia ornata, presenting a high decolorization to ADPE through fungal pretreatment. Five-fold low-diluted ADPE pretreated by L. ornata was the most suitable medium for the algal growth at an initial concentration of ammonium nitrogen of 380 mg L−1 in all dilution treatments. Initial optical density of 0.3 and pH of 9.0 were optimal culture conditions for the algal strain to provide the maximum algal yield (optical density = 2.1) and nutrient removal (88%, 58%, 65%, and 77% for the removal rates of ammonium nitrogen, total nitrogen, total phosphorus, and chemical oxygen demand, respectively) from the pretreated ADPE. This study demonstrated that fungal decolorization and subsequent microalgae cultivation could be a promising approach to algal biomass production and nutrient removal from ADPE.

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Industrial wastewater treatment using floating wetlands: a review

Mao,

Hu,

Deng

et al. 2023

Environ Sci Pollut Res

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pH treatments in continuous cultivation to maximize microalgal production and nutrient removal from anaerobic digestion effluent of aquatic macrophytes

Cited by 14 publications

References 70 publications

Enhancing algal growth and nutrient recovery from anaerobic digestion piggery effluent by an integrated pretreatment strategy of ammonia stripping and flocculation

Enhancing algal growth and nutrient recovery from anaerobic digestion piggery effluent by an integrated pretreatment strategy of ammonia stripping and flocculation

Enhancing Algal Yield and Nutrient Removal from Anaerobic Digestion Piggery Effluent by an Integrated Process-Optimization Strategy of Fungal Decolorization and Microalgae Cultivation

Industrial wastewater treatment using floating wetlands: a review

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