Influence of aeration rate and biodegradability fractionation on composting kinetics

Guardia, A. de; Petiot, C.; Rogeau, Didier

doi:10.1016/j.wasman.2006.10.019

Cited by 71 publications

(29 citation statements)

References 21 publications

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“…The composting of sludge and BA was studied using three pilot reactors (Figure 1) simulating the active phase of the composting process (De Guardia et al, 2008). Each reactor consisted of an airtight 300 L stainless steel cylindrical chamber with an inside diameter of 0.7 m and a length of 0.8 m. A 50 mm layer of polyurethane insulated the reacting chamber and limited heat losses.…”

Section: Composting Reactor and Monitoring Instrumentsmentioning

confidence: 99%

Effect of initial physical characteristics on sludge compost performance

Trémier¹,

Teglia²,

Barrington³

2009

Bioresource Technology

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To develop an active microbial activity quickly developing stabilizing thermophilic temperatures during the composting of wastewater sludge, the bulking agent (BA) plays a major role in establishing the recipe structure, exposed particle surface area and porosity. To optimize the biodegradation of a sludge compost recipe, the objective of this paper was to study the effect and interaction of initial moisture content (MC) and BA particle size distribution. Three 300 L insulated laboratory composters were used to treat two series of ten (10) recipes with different combinations of MC and BA particle size distribution. Using a BA to wastewater sludge dry mass ratio of 1/ 6, the ten (10) recipes were repeated using two BA, residues recycled from a commercial sludge composting plant and crushed wood pallets. Each four week trial monitored O 2 uptake, temperature, compost consolidation and airflow distribution. The Central Composite Factor Design method produced a model from the results estimating the impact of a wider range of MC and BA particles size distribution. The MC directly affected the total O 2 uptake and therefore organic matter biodegradation. The BA particle size distribution influenced compost consolidation with a MC crossed effect. Both BA particle size distribution and MC influenced compost airflow dispersion. Composting was optimized using the BA consisting of recycled green waste residues with particle size of 20 to 30 mm and a 55 % MC. The predictive models suggested the need for further optimization of sludge and wood residue composting recipe.

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Section: Composting Reactor and Monitoring Instrumentsmentioning

confidence: 99%

Effect of initial physical characteristics on sludge compost performance

Trémier¹,

Teglia²,

Barrington³

2009

Bioresource Technology

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“…Airflow is one variable easily controlled in laboratory reactors to alter oxygen availability. Multiple studies on degradation of organic matter have shown that aeration rate significantly affects self-heating profiles and rates of degradation, with low airflows reducing total organic matter decomposition by up to 20 % compared to respective high flow tests [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Influence of Airflow on Laboratory Storage of High Moisture Corn Stover

et al. 2014

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Storing high moisture biomass for bioenergy use is a reality in many areas of the country where wet harvest conditions and environmental factors prevent dry storage from being feasible. Aerobic storage of high moisture biomass leads to microbial degradation and self-heating, but oxygen limitation can aid in material preservation. To understand the influence of oxygen presence on high moisture biomass (50 %, wet basis), three airflow rates were tested on corn stover stored in laboratory reactors. Temperature, carbon dioxide production, dry matter loss, chemical composition, fungal abundance, pH, and organic acids were used to monitor the effects of airflow on storage conditions. The results of this work indicate that oxygen availability impacts both the duration of self-heating and the severity of dry matter loss. High airflow systems experienced the greatest initial rates of loss but a shortened microbially active period that limited total dry matter loss (19 %). Intermediate airflow had improved preservation in short-term storage compared to high airflow systems but accumulated the greatest dry matter loss over time (up to 27 %) as a result of an extended microbially active period. Low airflow systems displayed the best performance with the lowest rates of loss and total loss (10 %) in storage at 50 days. Total structural sugar levels of the stored material were preserved, although glucan enrichment and xylan loss were documented in the high and intermediate flow conditions. By understanding the role of oxygen availability on biomass storage performance, the requirements for high moisture storage solutions may begin to be experimentally defined.

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“…Petric and Selimbašić [18] studied the effects of airflow rates on the substrate temperature and organic matter conversion. Guardia et al [19,20] studied influence of different aeration rates (0.03-0.28 L/min kg DM) on composting kinetics and nitrogen dynamics. Gao et al [21] investigated composting of chicken manure and sawdust at aeration rates of 0.3, 0.5, and 0.7 L/min kg organic matter.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Effect of Aeration Rate on Composting of Vegetable–Fruit Wastes

Arslan

Ünlü

Topal

2011

CLEAN Soil Air Water

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In this study, it was aimed to determine the effect of various aeration rates on composting to supply the optimum aeration rate for a successful and economic composting. For this aim, vegetable-fruit wastes (VFW) were composted at various aeration rates (0.37, 0.49, 0.62, 0.74, 0.86, and 0.99 L/min kg VS) and moisture, temperature, pH, electrical conductivity, C/N, and cellulose were investigated. Moistures of the reactor that had the highest aeration were generally lower than those of the others. Reactor that had the lowest aeration reached thermophilic phase earlier than the others and stayed more days. This situation was opposite for the reactor that had the highest aeration. pH variations with aeration rates were not significant. Although electrical conductivity did not differ significantly with aeration rates, at the beginning of the thermophilic phase it generally increased with the increase in aeration. The highest C/N reduction was observed in the reactor that had an aeration of 0.62 L/min kg VS. The final cellulose contents were close to each other. It could be said that aeration rates used were efficient on composting of VFW. Taking the C/N into account which is the parameter of the indicator of the stabilization in composting, it could be said that the optimum aeration rate for forced aerobic composting of VFW was 0.62 L/min kg VS.

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Influence of aeration rate and biodegradability fractionation on composting kinetics

Cited by 71 publications

References 21 publications

Effect of initial physical characteristics on sludge compost performance

Effect of initial physical characteristics on sludge compost performance

Influence of Airflow on Laboratory Storage of High Moisture Corn Stover

Determination of the Effect of Aeration Rate on Composting of Vegetable–Fruit Wastes

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