Ultrafiltration concentrated biogas slurry can reduce the organic pollution of groundwater in fertigation

Zeng, Weishen; Qiu, Jinrong; Wang, Dehan; Wu, Z.; He, Lintong

doi:10.1016/j.scitotenv.2021.151294

Cited by 29 publications

(9 citation statements)

References 33 publications

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“…In biogas slurry concentration technology, membrane separation technology has become an ideal choice for biogas slurry concentration due to its cost-effective and convenient operation and no change in composition characteristics. Ultrafiltration, nanofiltration and reverse osmosis technology are the main technologies [ 5 , 9 , 10 ]. The concentrated liquid has the characteristics of unchanged nutrients, small volume, high concentration, easy transportation and storage, etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Critical Operation and Cleaning Parameters on Performances and Economic Benefits of Biogas Slurry Concentration by Forward Osmosis Membrane

Zhang

et al. 2023

Membranes

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Forward osmosis membrane technology (FO) shows potential application prospects in biogas slurry concentration, which is conducive to promoting the sustainable development of biogas projects. However, at present, the key influencing factors of membrane concentration using FO are not well understood. Therefore, this study analyzed the influence of draw solution concentration, pH, temperature and cross-flow velocity on the concentration efficiency of FO membrane, and optimized the operation parameters of FO membrane. The results showed that the concentration effect of the NaCl draw solution at pH 5 or 9 was better than that at pH 7. The order of factor influencing the water flux was as follows: draw liquid concentration > cross-flow velocity > operating temperature. The optimal combination obtained by orthogonal analysis was under 45 °C, with a cross-flow velocity of 1 L/min and the use of 1.5 mol/L NaCl as draw solution. The results of the membrane cleaning implied that the recovery rate of the fouled membrane after acid–base cleaning is significantly higher (88%) than other cleaning solutions. This research offers a scientific reference for applying positive osmosis technology to re-utilize biogas slurry resources.

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Section: Introductionmentioning

confidence: 99%

Effects of Critical Operation and Cleaning Parameters on Performances and Economic Benefits of Biogas Slurry Concentration by Forward Osmosis Membrane

Zhang

et al. 2023

Membranes

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“…The long-term adsorption of hydrophobic organic pollutants in soil and sediments can lead to severe soil and groundwater pollution problems. [2][3][4] Thus the development of remediation technologies for organic pollutant-contaminated soils has become a signicant global research hotspot.…”

Section: Introductionmentioning

confidence: 99%

Research progress of bio-slurry remediation technology for organic contaminated soil

et al. 2023

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“…The process and composition of biohydrogen slurry and biogas slurry are similar. It has been reported that biogas slurry could be used as a liquid fertilizer to irrigate land, which can significantly promote nitrogen absorption by plants, increase crop yield, and improve soil structure ( Zeng et al, 2022 ). But there are no reports about the utilization of biohydrogen slurry; instead, many researchers focused on the optimization and enhancement of the hydrogen production process ( Zhu et al, 2021 ).…”

Section: Introductionmentioning

confidence: 99%

Clean Style Recovery and Utilization of Residual Nutrients in Effluents From Biohydrogen Production: In Situ Immobilization Based on Sodium Alginate

Zhang

Fan

et al. 2022

Front. Bioeng. Biotechnol.

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Clean- and high-value recovery and reuse of the residue of biohydrogen production (biohydrogen slurry) is an urgent problem to be solved. In this study, sodium alginate (SA) gel was used to concentrate nutrients quickly in situ from biohydrogen slurry, which was prepared into gel microspheres (GMs), just like “capsule.” The immobilization and release efficiency of conventional and reverse spherification were investigated. Better immobilization and release efficiency were detected under the conventional spherification method. The effect of GM sizes and concentrations of SA and calcium chloride (CaCl2) was further studied in terms of sphericity factor, nutrient release, yield, encapsulation efficiency, and loading capacity. The best immobilization effect was obtained with a 1.6-mm syringe needle, 3.0 wt% SA, and 6 wt% CaCl2, in which the sphericity factor, nitrogen release, yield, nitrogen encapsulation efficiency, and nitrogen loading capacity reached to 0.047, 96.20, 77.68, 38.37, and 0.0476%, respectively. This process not only avoids environmental pollution from biohydrogen slurry but also uses them at a high value as a fertilizer to nourish the soil. The feasibility of “slurry capsule” preparation will realize the clean recovery and reuse of biohydrogen slurry, which provides a new idea for ecological protection and carbon neutral goals and has important significance for sustainable development.

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Ultrafiltration concentrated biogas slurry can reduce the organic pollution of groundwater in fertigation

Cited by 29 publications

References 33 publications

Effects of Critical Operation and Cleaning Parameters on Performances and Economic Benefits of Biogas Slurry Concentration by Forward Osmosis Membrane

Effects of Critical Operation and Cleaning Parameters on Performances and Economic Benefits of Biogas Slurry Concentration by Forward Osmosis Membrane

Research progress of bio-slurry remediation technology for organic contaminated soil

Clean Style Recovery and Utilization of Residual Nutrients in Effluents From Biohydrogen Production: In Situ Immobilization Based on Sodium Alginate

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