Composting potential of the solid fraction of digested pulp produced by a biogas plant

Czekała, Wojciech; Dach, Jacek; Dong, Renjie; Janczak, Damian; Malińska, Krystyna; Jóźwiakowski, Krzysztof; Smurzyńska, Anna; Cieślik, Marta

doi:10.1016/j.biosystemseng.2017.05.003

Cited by 53 publications

(34 citation statements)

References 22 publications

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“…While the initial temperature of composted mixtures was low (because of the low temperature of sewage sludge collected from an open storage facility during wintertime), all the materials had passed by with very fast growth temperatures ( Figure 1). In all the chambers, the temperature reached or exceeded 70 • C. High temperature (over 60 • C) for at least two days will annihilate most pathogens [52]. It should be noted, however, that the highest temperatures were only attained after several days.…”

Section: Resultsmentioning

confidence: 90%

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Heat Energy and Gas Emissions during Composting of Sewage Sludge

et al. 2019

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The composting of sewage sludge and maize straw mixtures was investigated in this study. The aim was to analyze the influence of different proportions of sewage sludge and maize straw in the mixtures on composting process dynamics (expressed by heat production) and gas emissions. The results showed that all examined mixtures reached a strong thermophilic phase of composting; however, the lowest dynamic of temperature growth was observed in the case of the biggest sewage sludge content (60% of sewage sludge in the composting mixture). The ammonia concentration inside bioreactor chambers was directly related to the content of sewage sludge in the composted mixture. Excessive contents of sewage sludge had a considerable effect on very low C/N ratios and high losses through ammonia emissions. Tests were carried out in reactors with a capacity of 160 dm3 under controlled conditions. All mixtures were aerated by the average air-flow of about 2.5 dm3∙min−1, i.e., the minimum air-flow that allows a temperature of about 70 °C to be reached and a sufficiently long thermophilic phase, which ensures proper composting.

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Section: Resultsmentioning

confidence: 90%

“…In all the chambers, the temperature reached or exceeded 70 °C. High temperature (over 60 °C) for at least two days will annihilate most pathogens [52]. It should be noted, however, that the highest temperatures were only attained after several days.…”

Section: Resultsmentioning

confidence: 99%

Heat Energy and Gas Emissions during Composting of Sewage Sludge

et al. 2019

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“…Supplementary materials perform various functions at the initial stage of composting such as providing structure (referred to as bulking agents) or amending the composition of composting mixtures (referred as amendments). Different types of straw or woody biomass -that are often used in composting -are becoming less available for composting due to increasing number of other applications, and also the increase in price [3]. Therefore, there is a need for alternative supplementary materials that can be used in the process of composting.…”

Section: Introductionmentioning

confidence: 99%

Spent Mushroom Substrate as a Supplementary Material for Sewage Sludge Composting Mixtures

Malińska

Czekała

Janczak

et al. 2018

Eng. Prot. Environ.

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Zużyte podłoże popieczarkowe jako materiał pomocniczy do przygotowywania mieszanek kompostowych z osadów ściekowych Spent mushroom substrate (SMS) is a byproduct from mushroom production. On average, it shows low content of organic matter but contains relatively high quantity of nitrogen (2.4%). SMS could be recycled as a soil amendment or could be an alternative for peat. Some studies indicate that SMS could be used as a supplementary material in composting of various biodegradable waste and municipal sewage sludge (SS). In composting, spent mushroom substrate could function as a bulking agent and provide structure in composting piles. The overall goal of this study was to determine whether SMS can be used as a supplementary material for preparation of composting mixtures of sewage sludge and could allow the achievement of the recommended values of moisture content (50÷60%), C/N ratio (25-35:1) and air-filled porosity (at least 75%) in the final composting mixtures. Due to high moisture content, low C/N ratio and lack of structure municipal sewage sludge cannot be composted alone. The addition of a supplementary material to municipal sewage sludge should provide adequate structure (for maintaining optimal air-filled porosity in a composting pile), moisture content and C/N ratio in the composting mixtures. The investigated SMS showed lower moisture content, organic matter, C/N ratio and mechanical strength in comparison to typical supplementary materials used in composting of sewage sludge (e.g. wheat straw or woodchips). The addition of SMS to SS (up to the ratio of SS:SMS 1:6) did not allow the achievement of the recommended values of moisture content, C/N ratio and air-filled porosity within a 2 m composting pile. Therefore, the investigated spent mushroom substrate cannot be considered a suitable bulking agent for preparation of municipal sewage sludge composting mixtures. However, SMS could be used for composting of other biodegradable waste which shows lower moisture content, higher C/N and better structure or for composting of sewage sludge together with lower quantities of other supplementary materials such as wheat straw.

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“…Straw is the most popular substrate for composting with SL. In the study [8] the research on composting SF as monosubstrate was carried out. The addition of sewage sludge in own research allowed to achieve higher temperatures ( fig.…”

Section: Gaseous Emission Changesmentioning

confidence: 99%

“…Composting and anaerobic digestion (AD) can be mentioned as part of the biological conversion process [8,9]. Composting is a controlled process of aerobic decomposition of organic matter with microorganisms, carried out in prisms or reactors [10].…”

Section: Introductionmentioning

confidence: 99%

Composting of sewage sludge with solid fraction of digested pulp from agricultural biogas plant

et al. 2018

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Abstract. Sewage sludge management is an important element of environmental protection. Composting and anaerobic digestion are the biological conversion methods for sewage sludge management. Mass and volume reduction is a result of a properly composted process. Solid fraction of digested pulp can be use as co-substrate, because it is good structural material. The aim of the study was to determine the possibility of composting sewage sludge with a solid fraction of digestate. The compost mix consisted of 25 kilograms of sewage sludge and 20 kilograms solid fraction of digestate in fresh mass. The experiment was carried out in laboratory conditions. Bioreactors of 165 dm 3 volume were used. The experiment included two stages. Stage I took place in bioreactors and lasted until the cooling phase of the compost was complete. Stage II included compost maturation for a period of eight months (to 287 day of composting). The reduction of mass obtained at the end of Stage I amounted 30.2%. At the end of Stage II, it was 86.7% relative to the initial weight of the compost. The maximum value of temperature was 75.1ºC. Studies have shown that sludge with a solid fraction of digestate can be a suitable substrate for composting with sewage sludge.Abbreviations AD -anaerobic digestion DM -dry matter FM -fresh matter MM -mineral matter OM -organic matter in Total Solids SF -solid fraction of digested pulp SL -sewage sludge

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Composting potential of the solid fraction of digested pulp produced by a biogas plant

Cited by 53 publications

References 22 publications

Heat Energy and Gas Emissions during Composting of Sewage Sludge

Heat Energy and Gas Emissions during Composting of Sewage Sludge

Spent Mushroom Substrate as a Supplementary Material for Sewage Sludge Composting Mixtures

Composting of sewage sludge with solid fraction of digested pulp from agricultural biogas plant

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