Integrated anaerobic digestion and algae cultivation for energy recovery and nutrient supply from post-hydrothermal liquefaction wastewater

Yang, Libin; Si, Buchun; Tan, Xuanping; Chu, Huaqiang; Zhou, Xuefei; Zhang, Yuanhui; Zhang, Yalei; Zhao, Fangchao

doi:10.1016/j.biortech.2018.06.083

Cited by 66 publications

(22 citation statements)

References 29 publications

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“…Results showed that Chlorella vulgaris CPCC 90 was able to grow and utilize nutrients from 10% diluted anaerobically digested CM. Any higher concentration of CM leachate showed an inhibitory effect on algal growth as reported previously [ 34 ]. The growth of Chlorella vulgaris CPCC 90 was estimated by using two methods: hemocytometer and plate reader.…”

Section: Resultssupporting

confidence: 83%

Coupling of Microalgae Cultivation with Anaerobic Digestion of Poultry Wastes: Toward Sustainable Value Added Bioproducts

et al. 2021

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Third generation biofuels and high-value bioproducts produced from microalgal biomass have been considered promising long-term sustainable alternatives for energy and/or food production, potentially decreasing greenhouse gas emissions. Microalgae as a source of biofuels have been widely studied for bioethanol/biodiesel/biogas production. However, critical research is needed in order to increase the efficiency of microalgae production from high-N agri-waste, not only for biofuels but also for bio-based products, and thus enhance its commercial viability. The growth in the poultry industry has led to increased chicken manure (CM), which are rich in ammonia, phosphate, potassium, and other trace elements. These constituents could be used as nutrients for growing microalgae. In this research, a two-stage (liquid–solid) anaerobic digester treating CM at 20 ± 1 °C was performed, and liquid digestate (leachate) obtained after the digestion process was used as a substrate to grow the microalgal strain Chlorella vulgaris CPCC 90. Considering the high-N content (NH3-N: 5314 mg/L; TKN: 6197 mg/L) in liquid digestate, different dilutions were made, using distilled water to obtain viz. 10%, 30%, 50%, 70%, 90%, and 100% of the digestate concentrations for the microalgae cultivation. Preliminary results showed that Chlorella vulgaris CPCC 90 was able to grow and utilize nutrients from a 10% diluted CM digestate. Future research is underway to enhance microalgal growth at higher digestate concentrations and to optimize the use of microalgae/microalgae-bacteria consortia for better adaptation to high-N content wastes. An AD-microalgae coupling scenario has been proposed for the circulation bioeconomy framework.

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Section: Resultssupporting

confidence: 83%

Coupling of Microalgae Cultivation with Anaerobic Digestion of Poultry Wastes: Toward Sustainable Value Added Bioproducts

et al. 2021

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“…Although CS had the lowest adsorption capacity of 64.94 mg.g − 1 and had lowest BET (63.08 m 2 /g), it resulted in higher methane yield and higher residual COD (23%) as compared with GAC. Previous studies considered that the adsorption capacity of GAC was important in the enhancement of methane yield of HTLWW [11,13,31]. However, the present study showed adsorption might not be necessarily related with the enhancement of methane yield.…”

Section: A M Totalcod Residualcod Methanecodcontrasting

confidence: 75%

“…For instance, GAC, which has high adsorption capacity for organics, was used in AD to enhance the methane yield. It was noticed the methane yield was increased by 28-67 % from different HTLWW with the addition of GAC [2,8,13]. The previous studies mainly thought GAC could adsorb toxic organics in HTLWW, and therefore, resulted in increased methane yield.…”

Section: Introductionmentioning

confidence: 96%

Hydrochar promoted anaerobic digestion of hydrothermal liquefaction wastewater: Focusing on the organic degradation and microbial community

Usman

Shi

Ren

et al. 2020

Chemical Engineering Journal

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“…Pathogens, genetic material, and pharmaceuticals present in the feedstock should be destroyed by the high temperatures and pressures [7,8], while passing on plant nutrients like nitrogen, potassium, and phosphorus [9]. These are reasons why PHWW has been used to produce algae [10][11][12], but the potential to use this wastewater for food production has yet to be deeply investigated in the literature. Currently, the only research done on PHWW has been with growing rice [13].…”

Section: Introductionmentioning

confidence: 99%

Treatment of Post-Hydrothermal Liquefaction Wastewater (PHWW) for Heavy Metals, Nutrients, and Indicator Pathogens

Jesse

Davidson

2019

Water

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Recycling post-hydrothermal liquefaction wastewater (PHWW) may allow the use of nutrients in the aqueous phase that may otherwise go unused. PHWW is an attractive option for use as fertilizer in systems like crop production. However, there are potential contaminants in the PHWW that may inhibit crop growth or pose a food safety risk. This study investigated the concentrations of heavy metals and nutrients in the PHWW, as well as the presence of indicator pathogens. In addition, four different water treatment methods were used: (1) dilution of raw PHWW, (2) sand filtration after dilution, (3) sand and carbon filtration after dilution, and (4) reverse osmosis after dilution. Our results indicate that the concentrations of cadmium, lead, and arsenic in raw PHWW were well below the maximum recommended concentrations set by the US Environmental Protection Agency (US EPA) for Water Reuse. In addition, the treatment methods in this study achieved percent removals ranging from 82–100% for cadmium, 99–100% for mercury, 75–99.5% for lead, and 71–99% for arsenic. Nitrogen in raw PHWW was predominantly in the total N form, preventing it from being accessible to plants. After nitrification was induced, the concentration of NO3 + NO2 increased by 1.75 mg/L in the untreated 5% PHWW mixture, but remained unchanged or decreased for all other treatments and mixtures. There were no E. coli or coliform colonies detected in the raw PHWW, or in any PHWW mixtures. All PHWW mixtures with and without treatment are within US EPA guidelines for metals for irrigation water reuse. However, fertilizer supplementation may be required for PHWW to be suitable for crop production, as the low concentrations of NO3 + NO2 may prove challenging for growing crops.

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Integrated anaerobic digestion and algae cultivation for energy recovery and nutrient supply from post-hydrothermal liquefaction wastewater

Cited by 66 publications

References 29 publications

Coupling of Microalgae Cultivation with Anaerobic Digestion of Poultry Wastes: Toward Sustainable Value Added Bioproducts

Coupling of Microalgae Cultivation with Anaerobic Digestion of Poultry Wastes: Toward Sustainable Value Added Bioproducts

Hydrochar promoted anaerobic digestion of hydrothermal liquefaction wastewater: Focusing on the organic degradation and microbial community

Treatment of Post-Hydrothermal Liquefaction Wastewater (PHWW) for Heavy Metals, Nutrients, and Indicator Pathogens

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