Browsing by Author "Parra Orobio, Brayan Alexis"
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Item Physicochemical, microbiological characterization and phytotoxicity of digestates produced on single-stage and two-stage anaerobic digestion of food waste(2021) Parra Orobio, Brayan Alexis; Rotavisky Sinisterra, María Paula; Pérez Vidal, Andrea; Marmolejo Rebellón, Luis Fernando; Torres Lozada, PatriciaOrganic amendments favor the development of sustainable agriculture by using less chemical fertilizers. In this way, the use of digestates from anaerobic digestion as soil conditioners in agriculture has been gaining interest due to their important N and P nutrient contents, among others. This study evaluated the potential use of digestates from anaerobic reactors treating food waste in single (D1) and two-stages (D2: hydrolytic/acidogenic and D3: acetogenic/methanogenic) configurations. Digestate characteristics and their potential application conditions (100, 50, 25, and 5%) were evaluated using Raphanus sativus as an indicator species. D3 reported the best performance in terms of: (i) better physicochemical, microbiological, and parasitological characteristics, being a class B material, without exceeding the established limits for heavy metals, fecal coliforms (FC < 1000 CFU 100 mL− 1), Salmonella spp. (0 CFU g− 1), and viable helminth eggs (0 HE g− 1); (ii) better stability indicators on D3, followed by D1 (volatile solids/total solids (VS/TS): 0.57 and 0.65, pH: 8.63 and 6.80, respectively), while D2 was the most unstable digestate (VS/TS > 0.87 and acidic pH); and (iii) greater potential for agricultural use, since a 5% dose produced a germination index > 120%, whose effect is associated with the presence of humic and fulvic acids and with N and P concentrations > 1%. In addition, the study reported that volatile fatty acids > 2500 mg L− 1 act as antimicrobial agents, reducing the required pathogen removal pretreatments.Item Potential production of struvite from the anaerobic digestion of food waste: Analysis in one-phase and two-phase configurations(2021) Parra Orobio, Brayan Alexis; Pérez Vidal, Andrea; Torres Lozada, PatriciaAnaerobic digestion (AD) of food waste (FW) has been gaining more interest as it has potential for the production of organic amendments with high struvite content, which is a nutrient of great interest in sustainable agriculture. The effect of AD of FW in one- and two-phase configurations on CH4 production and the potential for struvite formation using digestate was investigated. The two-phase was more efficient as its organic loading rate is 18% higher than that of one-phase configuration. Also, the two-phase yielded a higher CH4 content in biogas (>60%) and a higher organic matter transformation in each of the AD stages (>20%). The digestate complied with the regulatory requirements for the use of organic amendments, thereby being deemed as a Type-B material with a struvite precipitation potential, exceeding 80%, as opposed to the digestate from one-phase configuration, which may represent a revenue of up to US$ 26,505/yr.