Effects of the functional membrane covering on the gas emissions and bacterial community during aerobic composting

et al. 2022

A lab-scale experiment was conducted to assess effects of the membrane-covered technology and superphosphate on the compost quality and emissions of nitrogen-containing gases during aerobic composting. The results showed that the membrane-covered technology increased the temperature of the compost pile and accelerated degradation of organic matter. The membrane-covered (T1) sample attained a germination index (GI) of 50% and 80%, approximately 2 and 9 d earlier, respectively, relative to the control (CK) sample. However, the application of superphosphate might have an adverse effect on the GI value. The NH3 and N2O emissions during the aerobic composting were decreased by 25.8% and 13.1%, respectively, for the T1 sample compared to the CK sample, while these were reduced correspondingly by 21.3% and 27.2% for the superphosphate addition (T2) sample. Compared with the superphosphate addition, the membrane-covered approach reduced the NH3 emission but not the N2O emission. Thus, the membrane-covered aerobic composting is a potential technology for the adequate utilization of organic waste as a resource.

Section: Fig 1 Nitrogen Cycle During Aerobic Compostingmentioning

confidence: 99%

Effects of the membrane-covered technology and superphosphate on the compost quality and nitrogen-containing gas emissions during aerobic composting

et al. 2022

“…As a new static composting system, a semipermeable membrane-covered composting system is generally covered with a membrane having uniformly distributed pores that prevent the outward diffusion of dust, aerosols, and microorganisms but allow the outward diffusion of micromolecules (Ma et al 2021). The membrane also protects the composting feedstock from the effects of rain, wind, and other weather factors.…”

Section: Introductionmentioning

confidence: 99%

“…Gonzalez et al (2016) demonstrated that a semipermeable membrane-covered aerobic fermentation system could maintain a higher temperature for a longer time, and the composting cycle can be shortened to 30 days. Covering the system with the membrane improved the seed germination index (GI) and was conducive to the degradation of volatile solids (VS) (Ma et al 2021). Through semipermeable membrane-covered fermentation technology, Garcia-González et al (2015) showed that the membrane improved the product quality by absorbing more nitrogen from pig's manure.…”

Section: Introductionmentioning

confidence: 99%

“…The covering of the semipermeable membrane reduces the production and emission of CH4 and NH3 by 22.4% and 18.9%, respectively (Ma et al 2018). However, the membranes with different pore diameters have different emission reducing effects on NH3, CH4, CO2, and N2O (Ma et al 2021). Due to lack of the insulation, the surface layer of the raw materials is greatly affected by the outside temperature in the semipermeable membrane-covered composting system.…”

Section: Introductionmentioning

confidence: 99%

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Effects of combined membrane-covered systems on aerobic composting of strawberry vine and chicken manure

Liang

et al. 2022

A combination of semipermeable membrane-covered composting systems and greenhouses was used to investigate the effects of different insulation systems on the aerobic fermentation of mixed raw materials and changes in the characteristics of fermentation feedstock. The combination of semipermeable membrane-covered and greenhouse systems increased the peak temperature by 6.53 °C, the average fermentation temperature by 28.2%, and extended the duration of the effective high-temperature stage of fermentation (temperature ≥ 50 °C) by 14 days. The decomposition percentage of solid organic matter in the enhanced group was 11.8% higher than that in the normal group, and the fermentation cycle was shortened by 5 days. The duplication provided by using both the semipermeable membrane-covered and greenhouse systems was conducive to the harmless treatment of raw materials, promoted the maturity and efficiency of composting, and reduced the content of biologically toxic substances. This study provides a theoretical basis for improving the efficiency of aerobic fermentation and the safe treatment of solid waste.

“…Different types of organic waste can produce a wide range of VOCs during the fermentation process, due to differences in fermentation materials, processes, and equipment. In addition, microorganisms play an important role in aerobic composting (Ma et al 2021). The microbial community composition can change during composting, as so can the production of odors.…”

Section: Introductionmentioning

confidence: 99%

Volatile organic compounds and dominant bacterial community during aerobic composting of vegetable waste and cow manure co-complexing

Wang

et al. 2022

Vegetable waste was aerobically composed using a trough-type system, and the resulting emitted volatile organic compounds were investigated. In addition, the succession pattern of microorganisms was analyzed. Aerobic fermentation was conducted using a tomato stalk-cow dung mix (a water content of 65% and a carbon-to-nitrogen ratio of 25:1). The emitted volatile organic compounds comprised of 58 kinds of compounds, including 2 sulfur-containing compounds, 3 alcohols, 3 esters, 3 aldehydes, 3 ketones, 6 halogenated hydrocarbons, 18 aromatic hydrocarbons, 17 alkanes, and 3 alkenes. The primary volatile organic compounds produced were methyl sulfide, ethyl acetate, ethanol, and acetaldehyde. Clustering and principal coordinate analysis suggested that the community succession changed throughout the composting process in the odor-producing habitat. High-throughput sequencing revealed that the bacterial community was comprised of Firmicutes, Chloroflexi, Proteobacteria, and Actinobacteria, whereas the dominant flora included Ascomycota, Basidiomycota, and Mucoromycota. These findings could aid in the mitigation of volatile organic compounds and odors during vegetable waste composting as well as contribute to the development of deodorizing bacteria.