Study on dynamic sorption characteristics of modified biochars for ammonium in biogas slurry

Ding, Jingtao; Shen, Yujun; Ma, Yanru; Meng, Haibo; Cheng, Hongsheng; Zhang, Xi; Wang, Jian; Zhang, Pengyue

doi:10.25165/j.ijabe.20201301.4697

Cited by 4 publications

(3 citation statements)

References 22 publications

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“…The labile carbon supplied by the digestate, glycerol and straw provided a carbon source for these quick growing fungi from both the digestate and the soil. Meanwhile biochar, being able to sorb carbon and nutrients (Mukherjee et al, 2016;Ding et al, 2020), may have reduced the availability of these compounds, which may be a reason that digestate with biochar did not result in a change in the community composition compared to the soil only control. The merging of groups after 3 months is consistent with decreases in abundance of quick growing microorganisms as they exhaust their labile carbon supply (Meidute et al, 2008), shifting the community to a composition similar to the control soil.…”

Section: Discussionmentioning

confidence: 99%

Immobilisation of anaerobic digestate supplied nitrogen into soil microbial biomass is dependent on lability of high organic carbon materials additives

van Midden,

Harris,

Shaw

et al. 2024

Front. Sustain. Food Syst.

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Anaerobic digestate is a nutrient rich slurry by-product derived from biogas production, often used as a fertiliser due to its high nitrogen content. However, nitrogen losses from its application can lead to environmental pollution. In a laboratory experiment, the addition of high organic carbon materials to digestate-amended soil as a potential means to stimulate microbial immobilisation of digestate supplied nitrogen was investigated. Soil was incubated in pots for 5 months with digestate (equivalent to 250 kgN ha−1). The impact of adding carbon into the digestate (equivalent to 540 kgC ha−1) as either glycerol, straw, woodchip, or biochar on soil microbial and chemical parameters was quantified. Glycerol amended soils had significantly higher microbial biomass compared to digestate alone during the first month and at 30 days after application had a 4x higher on average microbial N. The digestate + straw treatment resulted in a 2.5x significantly greater nitrogen immobilisation compared to digestate alone after 3 months of incubation. The digestate + woodchip had a 2× higher mean microbial N after 5 months, whilst the biochar amendment did not stimulate significant nitrogen immobilisation at any time. These results suggest that mixing a labile to moderately labile organic carbon amendment, such as straw, with digestate has the greatest potential to reduce nitrogen losses following digestate application through microbial immobilisation.

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Section: Discussionmentioning

confidence: 99%

Immobilisation of anaerobic digestate supplied nitrogen into soil microbial biomass is dependent on lability of high organic carbon materials additives

van Midden,

Harris,

Shaw

et al. 2024

Front. Sustain. Food Syst.

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“…The development of the biogas industry through anaerobic digestion has already solved some of the problems in the treatment of livestock and poultry manure, and simultaneously alleviated the demand for energy [4,5] . However, the improper treatment of biogas residue may affect the normal operation of biogas projects, and cause secondary pollution either [6,7] . The biogas residue, used as a basal fertilizer returning to the field has become an important and main treatment means [8] .…”

Section: Introduction mentioning

confidence: 99%

Investigation of distribution uniformity of distributor for biogas slurry application based on CFD analysis

Chen

et al. 2023

International Journal of Agricultural and Biological Engineering

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A horizontal distributor for biogas slurry application was proposed to explore the distribution performance through CFD analysis and verified by field test. The rheological properties of biogas slurry were analyzed at first, and key parameters were obtained for the next simulation. The effects of distribution modes, inlet direction, and outlets number on the velocity distribution of flow field and mass flow rate of the horizonal distributor were investigated by CFD simulations. Results of rheological properties indicated that biogas slurry was a non-Newtonian fluid and exhibited shear-thinning behavior. It can be well described by power-law model. The simulation results showed that the geometry of rotor, especially the block numbers was the main factor that determining the fluid movement and trajectory of distribution and output. The mode rotor 1 with two blocks reached the lowest variable coefficient of mass flow rate (4.49%), indicating a higher degree of uniformity. The upward inlet direction would obtain less dead zone, and the distributor with an even outlets number would possess more uniform distribution and less dead zone. The field test of the distributor with rotor 1, upward inlet direction, and 24 outlets has been carried on to verify the simulation results, the variable coefficient of mass flow was 13.06%, which was slightly higher than the simulation (9.23%), but it still within the range of requirement (<15%). The proposed model and the findings of this work are of guiding significance for the study of the utilization technology and equipment of liquid biogas residue.

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“…Nevertheless, the proliferation of biogas plants has led to an increase in the production of biogas slurry, posing a challenge for its harmless resource treatment [ 2 ]. Biogas slurry, a by-product of anaerobic fermentation, contains various biologically active substances, including nitrogen, phosphorus, potassium, amino acids, trace elements, organic acids and humic acids [ 3 ]. Discharging untreated biogas slurry into water causes environmental pollution and wastes valuable nitrogen and phosphorus resources [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption characteristics and mechanism of ammonia nitrogen and phosphate from biogas slurry by Ca2+-modified soybean straw biochar

Wu,

Ye,

Wang

et al. 2023

PLoS ONE

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The utilization of biogas slurry is critical for the sustainable development of animal husbandry. Biomass carbon adsorption is a feasible method for the recycling of nutrients from biogas slurry. However, research on the co-adsorption of ammonia nitrogen and phosphate is scarce. Herein, soybean straw was utilized as the raw material to prepare Ca2+-modified biochar (CaSSB), which was investigated for its ammonia nitrogen and phosphate adsorption mechanisms. Compared with natural biochar (SSB), CaSSB possesses a high H/C ratio, larger surface area, high porosity and various functional groups. Ca2+-modified soybean straw biochar exhibited excellent adsorption performance for NH4+–N (103.18 mg/g) and PO43−−P (9.75 mg/g) at pH = 6, using an adsorbent dosage of 2 g/L. The experimental adsorption data of ammonia nitrogen by CaSSB corresponded to pseudo-second-order kinetics and the Langmuir isotherm model, suggesting that the adsorption process was homogeneous and that electrostatic attraction might be the primary adsorption mechanism. Meanwhile, the adsorption of phosphate conformed to pseudo-second-order kinetics and the Langmuir–Freundlich model, whose mechanism might be attributed to ligand exchange and chemical precipitation. These results reveal the potential of CaSSBs as a cost-effective, efficient adsorbent for the recovery of ammonium and phosphate from biogas slurry.

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Study on dynamic sorption characteristics of modified biochars for ammonium in biogas slurry

Cited by 4 publications

References 22 publications

Immobilisation of anaerobic digestate supplied nitrogen into soil microbial biomass is dependent on lability of high organic carbon materials additives

Immobilisation of anaerobic digestate supplied nitrogen into soil microbial biomass is dependent on lability of high organic carbon materials additives

Investigation of distribution uniformity of distributor for biogas slurry application based on CFD analysis

Adsorption characteristics and mechanism of ammonia nitrogen and phosphate from biogas slurry by Ca2+-modified soybean straw biochar

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