Abstract:This work investigates an innovative process to valorise agricultural digestate by the exploitation of solar energy. Digestate has been located in a lab-scale greenhouse to evaporate the liquid phase. Digestate vapours, rich in ammonia, are sent in a Drechsler trap, filled with 38% w/w sulfuric acid solution, through three solar air fans. A concentration of about 2 M of ammonium sulphate solution was recovered. The remaining dried solid phase, rich in phosphorous compounds, was evaluated as alternative to the … Show more
“… Fig. 9 a The Nijhuis Ammonium Recovery System (amended and redrawn after [ 201 ]); b recovery of nitrogen as ammonium sulfate from the ADDC (conceptualized from [ 202 ]) …”
Section: Solutionsmentioning
confidence: 99%
“…Nitrogen recovery using chemical stripping is an energy-extensive process with high temperature and chemical treatments (NaOH and H 2 SO 4 ) [ 202 ]. Battista et al [ 202 ] in an innovative step performed recovery of nitrogen as ammonium sulfate (~2M, yield under optimized process) from ADDC using solar energy-driven lab-scale greenhouse (Fig. 9b ).…”
Section: Solutionsmentioning
confidence: 99%
“…It can also be amended with the mineral elements [ 35 ] and AIMs to develop value-added products. Additionally, the LFD can also be processed for the recovery of nitrogen; aiding to this, the latest technological developments have been reviewed and discussed [ 87 , 201 , 202 ]. The microalgal biomass harvested from such liquid fractions can also bioaccumulate N, P, and traces of micronutrients as well [ 13 ].…”
Section: Solutionsmentioning
confidence: 99%
“…The recovered digestates can be further exploited as a suitable substrate for the mass multiplication of AIMs, owning to which bioformulations of the broad spectrum will be developed to meet the agriculture requirements. Additionally, the liquid fraction of digestate can also be processed for the recovery of nitrogen; aiding to this, the latest developments such as solar-driven technology [ 202 ], energy-efficient chemical stripping [ 201 ], and nanoparticle-assisted CANON process [ 87 ] have been discussed. The area is much promising and has immense potential to demonstrate multifaceted opportunities of generating greater revenues for the rural community where these resources (CD, BGS, DOCs) are in surplus availability.…”
Section: Review Of Commercial Viability and Economic Estimatesmentioning
Graphical abstract
The residual slurry obtained from the anaerobic digestion (AD) of biogas feed substrates such as livestock dung is known as BGS. BGS is a rich source of nutrients and bioactive compounds having an important role in establishing diverse microbial communities, accelerating nutrient use efficiency, and promoting overall soil and plant health management. However, challenges such as lower C/N transformation rates, ammonia volatilization, high pH, and bulkiness limit their extensive applications.
Here we review the strategies of BGS valorization through microbial and organomineral amendments. Such cohesive approaches can serve dual purposes viz. green organic inputs for sustainable agriculture practices and value addition of biomass waste. The literature survey has been conducted to identify the knowledge gaps and critically analyze the latest technological interventions to upgrade the BGS for potential applications in agriculture fields.
The major points are as follows: (1) Bio/nanotechnology-inspired approaches could serve as a constructive platform for integrating BGS with other organic materials to exploit microbial diversity dynamics through multi-substrate interactions. (2) Advancements in next-generation sequencing (NGS) pave an ideal pathway to study the complex microflora and translate the potential information into bioprospecting of BGS to ameliorate existing bio-fertilizer formulations. (3) Nanoparticles (NPs) have the potential to establish a link between syntrophic bacteria and methanogens through direct interspecies electron transfer and thereby contribute towards improved efficiency of AD. (4) Developments in techniques of nutrient recovery from the BGS facilities’ negative GHGs emissions and energy-efficient models for nitrogen removal. (5) Possibilities of formulating low-cost substrates for mass-multiplication of beneficial microbes, bioprospecting of such microbes to produce bioactive compounds of anti-phytopathogenic activities, and developing BGS-inspired biofertilizer formulations integrating NPs, microbial inoculants, and deoiled seed cakes have been examined.
“… Fig. 9 a The Nijhuis Ammonium Recovery System (amended and redrawn after [ 201 ]); b recovery of nitrogen as ammonium sulfate from the ADDC (conceptualized from [ 202 ]) …”
Section: Solutionsmentioning
confidence: 99%
“…Nitrogen recovery using chemical stripping is an energy-extensive process with high temperature and chemical treatments (NaOH and H 2 SO 4 ) [ 202 ]. Battista et al [ 202 ] in an innovative step performed recovery of nitrogen as ammonium sulfate (~2M, yield under optimized process) from ADDC using solar energy-driven lab-scale greenhouse (Fig. 9b ).…”
Section: Solutionsmentioning
confidence: 99%
“…It can also be amended with the mineral elements [ 35 ] and AIMs to develop value-added products. Additionally, the LFD can also be processed for the recovery of nitrogen; aiding to this, the latest technological developments have been reviewed and discussed [ 87 , 201 , 202 ]. The microalgal biomass harvested from such liquid fractions can also bioaccumulate N, P, and traces of micronutrients as well [ 13 ].…”
Section: Solutionsmentioning
confidence: 99%
“…The recovered digestates can be further exploited as a suitable substrate for the mass multiplication of AIMs, owning to which bioformulations of the broad spectrum will be developed to meet the agriculture requirements. Additionally, the liquid fraction of digestate can also be processed for the recovery of nitrogen; aiding to this, the latest developments such as solar-driven technology [ 202 ], energy-efficient chemical stripping [ 201 ], and nanoparticle-assisted CANON process [ 87 ] have been discussed. The area is much promising and has immense potential to demonstrate multifaceted opportunities of generating greater revenues for the rural community where these resources (CD, BGS, DOCs) are in surplus availability.…”
Section: Review Of Commercial Viability and Economic Estimatesmentioning
Graphical abstract
The residual slurry obtained from the anaerobic digestion (AD) of biogas feed substrates such as livestock dung is known as BGS. BGS is a rich source of nutrients and bioactive compounds having an important role in establishing diverse microbial communities, accelerating nutrient use efficiency, and promoting overall soil and plant health management. However, challenges such as lower C/N transformation rates, ammonia volatilization, high pH, and bulkiness limit their extensive applications.
Here we review the strategies of BGS valorization through microbial and organomineral amendments. Such cohesive approaches can serve dual purposes viz. green organic inputs for sustainable agriculture practices and value addition of biomass waste. The literature survey has been conducted to identify the knowledge gaps and critically analyze the latest technological interventions to upgrade the BGS for potential applications in agriculture fields.
The major points are as follows: (1) Bio/nanotechnology-inspired approaches could serve as a constructive platform for integrating BGS with other organic materials to exploit microbial diversity dynamics through multi-substrate interactions. (2) Advancements in next-generation sequencing (NGS) pave an ideal pathway to study the complex microflora and translate the potential information into bioprospecting of BGS to ameliorate existing bio-fertilizer formulations. (3) Nanoparticles (NPs) have the potential to establish a link between syntrophic bacteria and methanogens through direct interspecies electron transfer and thereby contribute towards improved efficiency of AD. (4) Developments in techniques of nutrient recovery from the BGS facilities’ negative GHGs emissions and energy-efficient models for nitrogen removal. (5) Possibilities of formulating low-cost substrates for mass-multiplication of beneficial microbes, bioprospecting of such microbes to produce bioactive compounds of anti-phytopathogenic activities, and developing BGS-inspired biofertilizer formulations integrating NPs, microbial inoculants, and deoiled seed cakes have been examined.
“…Nitrogen and phosphorus recovery from LF is also practiced through struvite precipitation and ammonia stripping [15]. Although many authors confirmed a high fertilizer value of struvite and ammonium sulphate [16][17][18], the recovery methods have limited practical application. This results from the fact that the alkaline effluent remaining after these processes is characterized by considerable salinity.…”
Biogas production in waste-to-energy plants will support the decarbonization of the energy sector and enhance the EU’s energy transformation efforts. Digestates (DG) formed during the anaerobic digestion of organic wastes contain large amounts of nutrients. Their use for plant fertilization allows for diversifying and increasing the economic efficiency of farming activities. However, to avoid regional production surpluses, processing technologies allowing the acquisition of products that can be transported over long distances are required. This study therefore aimed at determining the effect of applied methods of DG treatment on the chemical composition of the resulting products and their effect on the yields and chemical composition of plants. The following digestate-based products (DGBPs) were tested: two different digestates (DGs), their liquid (LF) and solid fractions (SF) and pellets from DGs (PDG), and pellets form SFs (PSF). Results from the experiment show that during SF/LF separation of DGs, >80% of nitrogen and 87% of potassium flows to LFs, whereas >60% of phosphorus and 70% of magnesium flows to SFs. The highest yields were obtained using untreated DGs and LFs. The application of DGs and LFs was not associated with a leaching of nutrients to the environment (apparent nutrients recovery from these products exceeded 100%). Pelletized DG and SF forms can be used as slow-release fertilizer, although their production leads to significant nitrogen losses (>95%) by ammonia volatilization.
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