Publication Date: 2018.
Poultry manure (PM) can contain ammonium and ammonia nitrogen, which may inhibit the anaerobic process. The aim of this work was to evaluate the performance of anaerobic digestion of PM co-digested with fruit and vegetable waste. Two semi-continuous bench scale (19L) stirred tank reactors were used. The operating conditions were: 34.5 °C, 2 gVS/L.d (organic load rate), 28 d of hydraulic retention time and 100 revolutions per m (1 h × 3 times by day) for the agitation. The reactors were fed PM and a mixture of PM and fruit and vegetable waste (FVW) at equal proportions (based on wet weight). The performance of the anaerobic process was assessed through biogas and methane yields, reduction of organic matter, release of nitrogen compounds and the monitoring of stability indicators (pH, volatile fatty acids (VFA), total (TA) and partial (PA) alkalinity). Moreover, the digestate quality was evaluated to determine potential risk and benefits from its application as biofertilizer. Toxicity was assessed using Daphnia magna immobilization tests. Results showed that biogas and methane yields from PM-FVW were 31% and 32% higher than PM alone, respectively. Values of organic matter, pH, alpha (PA/TA) and VFA revealed that stability was approached in PM and PM-FVW. The co-digestion of PM with FVW led to the highest methane and biogas yields, lower FAN and TAN concentrations, and a better digestate quality compared to mono-digestion of this manure.
Instituto de Microbiología y Zoología Agrícola
Author affiliation: Bres, Patricia Alina. INTA. Instituto de Microbiología y Zoología Agrícola; Argentina
Author affiliation: Beily, María Eugenia. INTA. Instituto de Microbiología y Zoología Agrícola; Argentina
Author affiliation: Young, Brian Jonathan. INTA. Instituto de Microbiología y Zoología Agrícola; Argentina
Author affiliation: Gasulla, Javier. INTA. Instituto de Microbiología y Zoología Agrícola; Argentina
Author affiliation: Butti, Mariano. INTA. Instituto de Ingeniería Rural; Argentina
Author affiliation: Crespo, Diana Elvira. INTA. Instituto de Microbiología y Zoología Agrícola; Argentina
Author affiliation: Candal, Roberto. Universidad Nacional de San Martín (UNSAM). Instituto de Investigación e Ingeniería Ambiental; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Author affiliation: Komilis, Dimitrios. Democritus University of Thrace. Department of Environmental Engineering; Grecia
Repository: INTA Digital (INTA). Instituto Nacional de Tecnología Agropecuaria