Energy Balance of a Biodrying Process for Organic Wastes of High Moisture Content: A Review

He, Pinjing; Zhao, Ling; Zheng, Wei; Wu, Duo; Shao, Liming

doi:10.1080/07373937.2012.693143

Cited by 68 publications

(24 citation statements)

References 63 publications

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“…Moreover, in the interest of sustainable and green economic practices, various types of waste heat obtained from boiler steam and flue gas have been appropriated for secondary resource utilisation by the Chinese government in recent years and are already used widely for the drying of sewage sludge in most Chinese cities [17,27].…”

Section: Introductionmentioning

confidence: 99%

Effects of thermal pretreatment on acidification phase during two-phase batch anaerobic digestion of kitchen waste

Jin

2015

Renewable Energy

130

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a b s t r a c tThe effect of thermal pretreatment (55e160 C) on the degradation characteristics of kitchen waste during anaerobic fermentation at medium temperature was investigated. The breakdown of both organics and inorganics and the enhancement of biogas production in batch tests caused by thermal pretreatment during subsequent anaerobic fermentation were examined. Considering the effect of the acidification products and ammonia nitrogen in the acidification phase on subsequent biogas production, the influencing factors and related characteristics of various fermentation types were investigated. The results indicate that thermal pretreatment cannot only promote the anaerobic degradability of KW and the biogas production from KW but can also reduce the retention time necessary for anaerobic acidification by five days. At 50e70 C and 140e160 C, the biogas production and organic removal rates of the subsequent anaerobic digestion process decreased slightly, whereas at 90 and 120 C, superior results were achieved during digestion.

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Section: Introductionmentioning

confidence: 99%

Effects of thermal pretreatment on acidification phase during two-phase batch anaerobic digestion of kitchen waste

Jin

2015

Renewable Energy

130

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“…Additionally, bio-heat production is accompanied by water generation, which results from microbial metabolism and may impact the drying efficiency (Cai et al, 2012). Although biodrying is a process that primarily results from the metabolic activities microorganisms (He et al, 2013), few studies have combined the study of water removal with investigations of bacterial communities during bio-drying.…”

Section: Introductionmentioning

confidence: 99%

Bacterial communities and their association with the bio-drying of sewage sludge

et al. 2016

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a b s t r a c tBio-drying is a technology that aims to remove water from a material using the microbial heat originating from organic matter degradation. However, the evolution of bacterial communities that are associated with the drying process has not been researched systematically. This study was performed to investigate the variations of bacterial communities and the relationships among bacterial communities, water evaporation, water generation, and organic matter degradation during the bio-drying of sewage sludge. High-throughput pyrosequencing was used to analyze the bacterial communities, while water evaporation and water generation were determined based on an in situ water vapor monitoring device. The values of water evaporation, water generation, and volatile solids degradation were 412.9 g kg À1 sewage sludge bio-drying material (SSBM), 65.0 g kg À1 SSBM, and 70.2 g kg À1 SSBM, respectively.Rarefaction curves and diversity indices showed that bacterial diversity plummeted after the temperature of the bio-drying pile dramatically increased on d 2, which coincided with a remarkable increase of water evaporation on d 2. Bacterial diversity increased when the pile cooled. During the thermophilic phase, in which Acinetobacter and Bacillus were the dominant genera, the rates of water evaporation, water generation, and VS degradation peaked. These results implied that the elevated temperature reshaped the bacterial communities, which played a key role in water evaporation, and the high temperature also contributed to the effective elimination of pathogens.

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“…Biodried material can be considered as a solid recovered fuel-like product, leading to a better respirometric index (Rada and Ragazzi, 2014). The SSBM moisture content is not efficiently decreased during the initial sewage sludge biodrying phase; however, after the self-heating of the biodrying pile, the SSBM moisture content can be significantly reduced (He et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

“…The major difference of biodrying from composting is that the major purpose of composting relates to biological stability and maturity, while the one of biodrying is to achieve the highest water removal in a short duration (Rada et al, 2009). Researchers have analyzed the energy balance of a biodrying process (He et al, 2013). The kinetics of volatile solids biodegradation and the simultaneous effect of initial moisture content and airflow rate on biodrying performance have been studied (Huiliñir and Villegas, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…However, thermal dryers using external energy have been used for sludge dewatering, which do not rely on microbial produced heat, leading to high costs (Kurt et al, 2015). Compared to thermal drying, no extra heat is required for biodrying (He et al, 2013). Biodrying, an alternative way to treat biomass waste, is an economical and energy-saving method that removes water from waste material using the microbial heat originating from organic matter degradation, which is based on a process similar to composting (Winkler et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Structure modification and extracellular polymeric substances conversion during sewage sludge biodrying process

Cai

Krafft

Chen

et al. 2016

Bioresource Technology

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Energy Balance of a Biodrying Process for Organic Wastes of High Moisture Content: A Review

Cited by 68 publications

References 63 publications

Effects of thermal pretreatment on acidification phase during two-phase batch anaerobic digestion of kitchen waste

Effects of thermal pretreatment on acidification phase during two-phase batch anaerobic digestion of kitchen waste

Bacterial communities and their association with the bio-drying of sewage sludge

Structure modification and extracellular polymeric substances conversion during sewage sludge biodrying process

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