Ammonia recovery from anaerobic digestate: State of the art, challenges and prospects

Yang, Dongyuan; Chen, Qiuhong; Li, Rui; Liu, Song; Zhang, Yue; Dai, Xiaohu

doi:10.1016/j.biortech.2022.127957

Cited by 37 publications

(9 citation statements)

References 102 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The recovered nitrogen can be obtained in the form of ammonium sulfate and ammonium bicarbonate or condensed and collected as liquid ammonia. Notably, nitrogen recovery technologies are typically associated with fertilizer production, particularly for obtaining struvite and ammonium sulfate (Yang, et al, 2022a). Given that reintroducing the recovered nitrogen into liquid form (suitable for methanotroph utilization) entails additional costs, direct access to dissolved nitrogen may represent a more viable method for nitrogen recovery.…”

Section: Methanotroph Biotransformation Platformmentioning

confidence: 99%

Methanotroph biotransformation for nutrient recovery: a review of current strategies and future opportunities

Zheng,

Liu,

Khademi

et al. 2024

Biofuel Res. J.

View full text Add to dashboard Cite

The escalating global demand for protein and the imperative to meet sustainable development goals have driven the emergence of biotransformation platforms, with methanotrophs showing significant potential in this field. In this paper, the metabolism, nutritional requirements, cultivation strategies, and bioreactors of methanotrophs are reviewed. Integrating upstream and downstream technologies is also advocated to advance the development of methanotroph biotransformation platforms toward a circular economy model. The advancements in utilizing biogas as a viable carbon source and wastewater as a nitrogen source are discussed, emphasizing the need for detailed quality control and safety assessments to ensure the suitability of single-cell protein as animal feed. In general, by integrating advanced nutrient recovery technologies to define new process routes, methanotroph biotransformation platforms can bring better environmental benefits by reducing carbon emissions and saving resources. Shifting to renewable energy is crucial for achieving environmental sustainability. By using renewable energy to power microbial fermentation, biomass dehydration, and waste recycling, the platform can offset high energy consumption and attain significant market competitiveness with traditional protein sources.

show abstract

Section: Methanotroph Biotransformation Platformmentioning

confidence: 99%

Methanotroph biotransformation for nutrient recovery: a review of current strategies and future opportunities

Zheng,

Liu,

Khademi

et al. 2024

Biofuel Res. J.

View full text Add to dashboard Cite

show abstract

“…In addition, the chemical synthesis of ammonia is a highly energyintensive process [4,5]. Approximately 10% of global energy usage comes from the synthetic ammonia industry, which not only consumes a large amount of fossil fuels but also generates substantial quantities of pollutants and greenhouse gases [6,7]. Besides chemical fertilizer, biological nitrogen xation is another major source of xed nitrogen, which once played an essential role in agricultural production before the emergence of synthetic ammonia industry [8].…”

Section: Introductionmentioning

confidence: 99%

Engineering of a photosynthetic diazotroph as biofertilizer for efficient nitrogen fixation powered by sunlight

Zeng,

Wang,

et al. 2023

Preprint

View full text Add to dashboard Cite

Background Photosynthetic diazotrophs expressing iron-only (Fe-only) nitrogenase can be developed into a promising biofertilizer, as it can accomplish the energy-intensive process of nitrogen fixation by light energy and is independent on the molybdenum availability in the soil. However, the expression of Fe-only nitrogenase in diazotrophs is repressed by the fixed nitrogen of the soil, limiting the efficiency of nitrogen fixation in farmland with low ammonium concentrations that are inadequate for sustainable crop growth. Results We succeeded in constitutively expressing the Fe-only nitrogenase even in the presence of ammonium by controlling the transcription of Fe-only nitrogenase gene cluster (anfHDGK) with the transcriptional activator of Mo nitrogenase (NifA*) in several different ways, indicating that the engineered NifA* strains can be used as promising chassis cells for efficient expression of different types of nitrogenases. When applied as a biofertilizer, the engineered Rhodopseudomonas palustris effectively stimulated rice growth, contributing to the reduced use of chemical fertilizer and the development of sustainable agriculture. Conclusion We developed the engineered R. palustris strains that constitutively express Fe-only nitrogenase in the presence of ammonium for the first time. These R. palustris strains driven by sunlight can be used as efficient nitrogen biofertilizers.

show abstract

“…Easy to operate Nitrogen recovery percentage lower than other methods [33,35,36] Ion exchange And absorption…”

mentioning

confidence: 99%

Ammonia Recovery from Livestock Manure Digestate through an Air-Bubble Stripping Reactor: Evaluation of Performance and Energy Balance

et al. 2023

View full text Add to dashboard Cite

The recovery of livestock manure, rich in nutrients, as fertilizer in agriculture, could pose the risk of an excessive load of nitrogen on the soil. Ammonia stripping is one of the available technologies for reducing the amount of nitrogen in the digestate obtained by the anaerobic digestion of manure. The study investigated the performance and energy consumption of a full-scale ammonia-stripping plant, equipped with a bubble reactor and working without the use of any alkaline reagent under semi-batch conditions. Stripping tests were conducted on the liquid fraction of the digestate, studying the current and optimized operative conditions of the plant. The main variables influencing the process were pH, temperature, airflow, and feed characteristics. In the experimental tests, the pH spontaneously increased to 10, without dosing basifying agents. Higher temperatures favoured the stripping process, the higher tested value being 68 °C. The airflow was kept equal to 15 Nm3 h−1 m−3digestate in the pre-stripping and to 60 Nm3 h−1 m−3digestate in the stripping reactors, during all tests. The energy requirement was completely satisfied by the CHP (combined heat and power) unit fed with the biogas produced by manure digestion. Results showed anaerobic digestion coupled with stripping to be a suitable solution for removing up to 81% of the ammonium with neither external energy input nor reagent dosage.

show abstract

Ammonia recovery from anaerobic digestate: State of the art, challenges and prospects

Cited by 37 publications

References 102 publications

Methanotroph biotransformation for nutrient recovery: a review of current strategies and future opportunities

Methanotroph biotransformation for nutrient recovery: a review of current strategies and future opportunities

Engineering of a photosynthetic diazotroph as biofertilizer for efficient nitrogen fixation powered by sunlight

Ammonia Recovery from Livestock Manure Digestate through an Air-Bubble Stripping Reactor: Evaluation of Performance and Energy Balance

Contact Info

Product

Resources

About