The impact of compaction, moisture content, particle size and type of bulking agent on initial physical properties of sludge-bulking agent mixtures before composting

Huet, Joachim; Druilhe, Céline; Trémier, Anne; Benoist, Jean-Claude; Debenest, Gérald

doi:10.1016/j.biortech.2012.03.031

Cited by 74 publications

(38 citation statements)

References 24 publications

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“…Physical parameters such as water content, bulk density, porosity and permeability have been measured in static (Agnew and Leonard, 2003;Richard et al, 2004;Schaub-Szabo and Leonard, 1999) and dynamic (Huet et al, 2012) conditions. Agnew and Leonard (2003) have reported porosity values for solid cow manure ranging between 90% and 92% and solid particle dry densities between 1200 and 1800 kg m À3 .…”

Section: Introductionmentioning

confidence: 99%

Assessment of percolation through a solid leach bed in dry batch anaerobic digestion processes

Shewani

Horgue²,

Pommier³

et al. 2015

Bioresource Technology

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This work aimed at assessing water percolation through a solid cow manure leach bed in dry batch AD processes. A laboratory-scale percolation column and an experimental methodology were set up. Water behaviour was modelled by a double porosity medium approach. An experimental procedure was proposed to determine the main hydrodynamic parameters of the multiphase flow model: the porosity, the permeability and the term for water exchange from macro- to micro-porosity. Micro- and macro-porosity values ranged from 0.42 to 0.70 m(3) m(-3) and 0.18 to 0.50 m(3) m(-3). Intrinsic permeability values for solid cow manure ranged from 5.55·10(-11) to 4.75·10(-9) m(2). The term for water exchange was computed using a 2nd order model. The CFD tool developed was used to simulate successive percolation and drainage operations. These results will be used to design leachate recirculation strategies and predict biogas production in full-scale dry AD batch processes.

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Section: Introductionmentioning

confidence: 99%

Assessment of percolation through a solid leach bed in dry batch anaerobic digestion processes

Shewani

Horgue²,

Pommier³

et al. 2015

Bioresource Technology

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“…Thus, the organic materials were potentially more biodegradable in R3 and R4, which contained corncobs and sunflower stalks Garcia et al, 1992). During composting, the FAS level is important for determining the amount and flow of air and to increase the oxygen distribution in the compost mass (Huet et al, 2012;Jolanun and Towprayoon, 2010;Lu et al, 2001;Kulcu and Yaldiz, 2007). Haug (1993) stated that the minimum FAS value to supply enough oxygen should be between 20% and 30%, regardless of the type of waste or the technology used.…”

Section: Temperaturementioning

confidence: 99%

“…These materials may be used as regulatory BAs to balance the moisture contents of the sludge and increase its porosity to permit airflow. In addition, these materials may be used to balance the C/N ratio and provide additional carbon for improve the microbial activity (Diaz et al, 1993;Haug, 1993;Iranzo et al, 2004;Tremier et al, 2005;Mohajer et al, 2009;Huet et al 2012). Supplementation of bulking agents can also provide optimum free air space (FAS) and void dispersion in composting (Iqbal et al, 2010), which permit adequate water and gas exchange between gas and solid phases, and prevent excessive compaction of the composting materials (Kulcu and Yaldiz, 2007).…”

Section: Introductionmentioning

confidence: 99%

Composting of wastewater treatment sludge with different bulking agents

Uçaroğlu

Alkan

2015

Journal of the Air & Waste Management Association

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The main objectives of this study were to investigate the compostability of wastewater treatment sludge (WTS) containing different bulking agents (BAs) and to determine the most efficient BA. Four different compost trials consisting of mixtures of wheat straw (WS), plane leaf (PL), corncob (CC) and sunflower stalk (SS) with WTS were performed in laboratory reactors. In all experiments, a mixture of 60% WTS and 40% BA (wet basis) was used. The temperature, dry matter (DM), organic matter (OM), pH, electrical conductivity (EC) and C/N ratio were monitored during the composting process. Evaluation of the operational parameters showed that the highest organic matter degradation (i.e. 37.6%), loss of dry matter (i.e. 29.6%) and temperature (i.e. 64°C) were achieved for the WTS-CC mixtures. Results also showed that the WTS-SS mixture was also successful in terms of these operational parameters. Use of bulking agents for the treatment of wastewater treatment sludge in composting process is an important issue with regards to process efficiency, economy and disposal of agricultural waste. Corncob and sunflower stalk that were previously not used for the composting of WTS from food industry were shown to be highly successful BA materials in this study.Implications: The compostability of wastewater treatment sludge from the food industry with different bulking agents was studied. Wheat straw, plane leaf, corncob, and sunflower stalk were used as bulking agents. The required microbial stabilization and degree of mineralization were achieved with corncobs and sunflower stalks. PAPER HISTORY

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“…The moisture content (MC) is a key parameter in composting because water is the medium in which the nutrients required for microbial activity are dissolved and transported [2], and the MC can affect the air-filled porosity and thermal conductivity of the waste material [3]. A low MC is unfavorable for microbial growth in composting, and a high MC can suppress the mass transfer of air.…”

Section: Introductionmentioning

confidence: 99%

Effect of C/N on Water State during Composting of Kitchen Waste and Vegetable Waste Mixture

Liu

Yang

et al. 2017

Journal of Chemistry

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The objective of this study was to evaluate the effects of the C/N ratio on the water state changes during the composting of kitchen waste (KW) and vegetable waste (VW) mixtures. The C/N ratios in KW and VW were 50.70 and 27.07, respectively, and the VW was added to the KW to amend the C/N ratio. Five composting treatments were used, R1 with 0% KW, R2 with 25% KW, R3 with 50% KW, R4 with 75% KW, and R5 with 100% KW, and the initial C/N ratios increased in the order R1 < R2 < R3 < R4 < R5. As the composting process progressed, the capillary water (CW) and multi-molecular-layer water (MMLW) were changed into entrapped water (EW), and a high C/N ratio could delay the changes in the water state. The percentage of EW and CW significantly positively correlated with the C/N ratio during the composting of KW. The composting process performed better in treatments R2 and R3 than in the other treatments, and it was found that treatments R2 and R3 each had a lag phase of around 4 d until the water states started to change.

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The impact of compaction, moisture content, particle size and type of bulking agent on initial physical properties of sludge-bulking agent mixtures before composting

Cited by 74 publications

References 24 publications

Assessment of percolation through a solid leach bed in dry batch anaerobic digestion processes

Assessment of percolation through a solid leach bed in dry batch anaerobic digestion processes

Composting of wastewater treatment sludge with different bulking agents

Effect of C/N on Water State during Composting of Kitchen Waste and Vegetable Waste Mixture

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