Response of cattle manure anaerobic digestion to zinc oxide nanoparticles: Methane production, microbial community, and functions

Soil Management in Sustainable Agriculture: Analytical Approach for the Ammonia Removal From the Diary Manure

“…According to the chromatographic results, CO2 (85%) and 3.4% H2 are formed due to organic matter degradation in dairy manure, whereas no indications of methane (CH4) generation were observed during both the first and second stages of hydrolysis. Our findings support (Abendroth et al, 2015;Bayrakdar et al, 2017;Niu et al, 2014;Qi et al, 2021;Zejak et al, 2022) by demonstrating that methanogenic processes are hindered during manure hydrolysis and that the quantity of COD5 excreted may be insignificant. Our findings also demonstrate that an acceptable quantity of organic ammonia conversion from nitrogenous substances takes three to seven days.…”

Response behavior of antibiotic resistance genes to zinc oxide nanoparticles in cattle manure thermophilic anaerobic digestion process: A metagenomic analysis

“…However, it has been previously reported that microbes that take part in the AD process, such as bacteria belonging to genera Acinetobacter, Enterococcus, and Pseudoxanthomonas as potential hosts, can develop antibiotic resistance and these mechanisms are encoded in ARGs (Flores-Orozco et al, 2020;Franco et al, 2009). In addition, the aforementioned ARGs hosts have been detected in livestock wastes in our previous study (Qi et al, 2021) and it is well known that high microbial density can be conducive to ARGs' propagation (Franco et al, 2009). Many studies have demonstrated that behavior of ARGs' can vary in AD process due to both the operational conditions of the digestion process, and the presence of exogenous substrates, such as feed additives (Baker-Austin et al, 2006;Sun et al, 2016).…”

“…AD experiments were carried out in an automatic methane potential test system II (AMPTS II) (Bioprocess Control, Sweden) equipped with serum bottles. Experimental conditions of temperature (55 °C), TS of 6% (mass ratio), and initial pH of 10, as determined in our previous study (Qi et al, 2021), were kept constant in all cases. Two AD experimental groups consisting of cattle manure spiked with ZnO NPs at concentrations of 0 and 5 mg/g TS (marked as G0 and G1, respectively) were set up.…”

“…The initial cattle manure sample in the control group (G0) was marked as Ori. The ZnO NPs concentration (5 mg/g total solid) was determined in our previous study based on the AD performance and literature data (Qi et al, 2021). The working volume of each reactor was 400 ± 10 mL.…”

Enhancement of Anaerobic Digestion with Nanomaterials: A Mini Review

“…Cu and Fe oxides Biogas and methane increase Batch, iron and copper NPs were synthesized by hydrothermal treatment of corn straw [16] Co ferrate Biogas and methane increase Batch, NP addition enhanced H 2 /CO 2 methanogenesis pathway. Excess NPs revealed negative effects [17] Cu and Fe oxides Biogas and methane increase Batch, review of microbial mechanisms [18] Fe zero-valent Biogas increase and methane enrichment Continuous, increase in the biodegradability of fibers due to the presence of NPs [19] Zn oxide Biogas and methane increase Batch, inhibition observed at high ZnO NPs concentrations [20] Fe zero-valent Methane enrichment Continuous, increase in the methane content of biogas, under both thermophilic and mesophilic conditions [12] Ti and Fe oxides Biogas and methane increase Semicontinuous, NPs and salts boosted methane production for lignocellulosic materials [21] Fe zero-valent Methane enrichment Semicontinuous, the increase in the oxidation state of NPs seemed to be related to the loss of effect over time [11] Ti oxide Biogas increase and fast hydrolysis and acidogenesis Batch, hydrolysis and acidogenesis rates have been enhanced due to the addition of NPs [22] Fe oxide Biogas increase and inhibition of H 2 S production Batch, high rate of H 2 S production decrease (from 50 to 80%) [23] Fe zero-valent Methane increase and better stability Batch, NPs promoted the acidogenesis-acetogenesis without acidification [24] Table 2. Examples of studies using other nanomaterials and their effect on anaerobic digestion.…”