Changes in microbial populations during co-composting of dewatered sewage sludge with pruning wastes in windrow piles

Nafez, Amir Hossein; Nikaeen, Mahnaz; Hassanzadeh, Akbar; kadkhodaei, safoora

doi:10.13057/biodiv/d211026

Cited by 3 publications

(3 citation statements)

References 27 publications

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“…Biodegradation of organic matter can be assessed using the C/N ratio, which indicates the stabilization of organic fertilizers (Nafez et al, 2020;Nayak et al, 2020;Palaniveloo et al, 2020). Bioconversion of cattle and goat manure, with composting or vermicomposting, resulted in lower C/N ratios compared to baseline levels.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, the C/N ratio observed in the experiments is suitable for composting (< 20) and vermicomposting (< 14), according to MAPA Normative Instruction (Brasil, 2009). A C/N ratio between 12 and 15 at the end of the composting process indicates compost maturity and ideal conditions for fertilization (Onwosi et al, 2017;Nafez et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

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Increased quality of small-scale organic compost with the addition of efficient microorganisms

Panisson

Muscope

Müller

et al. 2021

Rev. Bras. Ciênc. Ambient.

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Substantial quantities solid waste from livestock are potential sources of nutrients for agroecological production on small-scale farms. The processes used to extract these wastes, however, must be capable of eliminating pathogenic microorganisms. We aimed to evaluate composting and vermicomposting processes by inoculating efficient microorganisms at the field scale. We used cattle and sheep manure with the inoculation of efficient microorganisms (EMs) at concentrations of 0, 2, and 4 mL L-1. In vermicomposting experiments, we added Lumbricus rubellus. After the maturation and stabilization phases of the compounds, concentrations of macronutrients, micronutrients, heavy metals, thermotolerant coliforms and Salmonella spp. were measured. We found that composting processes allowed high availability of macronutrients. Vermicomposting, associated with inoculation with 2 mL L-1 EMs, promoted the lowest concentration of thermotolerant coliforms, ensuring greater elimination of pathogens. The compost produced allowed the valuation of waste and use it as a quality organic fertilizer for agroecological production.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Increased quality of small-scale organic compost with the addition of efficient microorganisms

Panisson

Muscope

Müller

et al. 2021

Rev. Bras. Ciênc. Ambient.

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“…These composting plants adopt continuous operation systems that input daily fresh feed and continuously aerate and intermittently mix it. There are many research articles on composting processes published worldwide; however, most of them addressed batch processes (e.g., Chang et al, 2010;Gao et al, 2010;He et al, 2013;Saffari et al, 2016;Zorpas et al, 2017;Manu et al, 2017;Cerda et al, 2018;Jain et al, 2018;Yu et al, 2018;Bian et al, 2019;Meng et al, 2019;Mali et al, 2020;Liu et al, 2020;Zhang et al, 2020;Nafez et al, 2020;Wang et al, 2021;Meena et al, 2021;Assandri et al, 2021). Some studies focused on issues specific to continuous operations such as the concept of organic loading to a reactor (Maruchi et al, 2016) and the aeration conditions calculated based on material balance around a reactor (Matsuda, 2016).…”

Section: Introductionmentioning

confidence: 99%

Characterization of the Microbial Community in A Continuous Garbage Treatment Process

Matsuda¹,

Suherman²,

Yanagihara³

et al. 2021

EER

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Previously, we developed a “static type” garbage treatment system whose performance exceeds that of conventional garbage treatment systems. However, we could not explain the system’s excellent performance especially from a microbial ecosystem’s stand point (Matsuda et al, 2017). Microbial activity causes the decomposition of organic materials in a garbage treatment process. However, we do not know which microbes are effective in garbage decomposition and what relationship exists between the succession of a microbial community and the decomposition of organic materials in a garbage composting process.  This study analyzed the relationship between a continuous operation garbage treatment system’s microbial community and the decomposition of organic matter and evaluated for effective microbes in the same garbage treatment system. Although many research articles have been published on the composting processes throughout the world, most of them employ batch processes and not continuous processes. Conversely, most real-world practical composting plants adopt a continuous operation system in which fresh feed is usually input once a day with continuous aeration and intermittent mixing.  To comprehensively analyze the microbial community, three different approaches were adopted in this study; 1) colony observation, 2) DNA analysis, and 3) the enzymatic activities of each colony. In our experiment, the working volume was 10 L of leaf mold and 40 g/(day L) of garbage (the organic load) was input to the reactor every day at a fixed time. Dog food with 70 % moisture content was used as a model garbage substrate. The reactor’s internal temperature, the total reactor’s weight and the sampled residue’s weight, moisture content and pH were measured before inputting garbage. Additionally, the reactor’s internal temperature was measured six hours later. The internal temperature was about 55 ℃ at the highest without heating. The organic matter decomposition rate was about 50 % and the weight reduction rate was over 90 %, implying successful garbage decomposition was achieved. The microbial composition and the number of the colonies seen on the medium plate changed every day and did not realize a “steady state.” Thus an extremely efficient microbe does not exist. Only eleven microbes were isolated; yet many more microbes must exist in the system but were not counted due to a high dilution rate. From our DNA analysis, the PCR-DGGE profile of the microbial community in the garbage residue showed that bands of isolated colonies were detected in the same positions as the bands of garbage residue, which contained all kinds of microbes. Nine microbes were identified using 16S rRNA genome from eleven isolated ones. The identified microbes were of different bacterial species and their characteristics were examined from the stand point of nutritional property and enzymatic activity.  The garbage decomposition process consists of two steps, solubilization and metabolization. Extracellular enzymes act during solubilization of solid garbage residue, and intracellular enzymes work when water-soluble substances are taken up into bacterial cells and metabolized. Protease and amylase activity were measured to assess extracellular enzymatic activity and dehydrogenase activity was measured to evaluate intracellular enzymatic activity. The enzyme activities of bacterial strains significantly differed by strain. Results from this study suggest complementary microbial activity and that Bordetella trematum, Bacillus cereus, Bacillus subtills subtills and Streptomyces thermocarboxydus effectively decompose garbage.

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Insights of bacterial communities in kitchen and agricultural waste composts for environmental sustainability: a systematic review

Soong,

Chew,

Gew

2024

Int. J. Environ. Sci. Technol.

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Changes in microbial populations during co-composting of dewatered sewage sludge with pruning wastes in windrow piles

Cited by 3 publications

References 27 publications

Increased quality of small-scale organic compost with the addition of efficient microorganisms

Increased quality of small-scale organic compost with the addition of efficient microorganisms

Characterization of the Microbial Community in A Continuous Garbage Treatment Process

Insights of bacterial communities in kitchen and agricultural waste composts for environmental sustainability: a systematic review

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