Filling in sewage sludge biodrying gaps: Greenhouse gases, volatile organic compounds and odour emissions

González, Daniel; Guerra, Nagore; Colón, Joan; Gabriel, David; Ponsá, Sergio; Sánchez, Antoni

doi:10.1016/j.biortech.2019.121857

Cited by 26 publications

(24 citation statements)

References 35 publications

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“…VOCs (generally organosulfur compounds, nitrogenous compounds, ketones, and terpenes), NH 3 , H 2 S, N 2 O, and CH 4 are the main gases emitted during SSF processes and may be responsible for producing air pollution and bad odors if the proper treatment is not provided (Maulini-Duran et al, 2015). All these gaseous compounds are related to the biological decomposition of organic matter, nitrogen, and sulfur-based compounds (González et al, 2019). Characterizing these emissions is essential to selecting the suitable gas treatment technology type and design, which must be included in the economic and environmental analysis.…”

Section: Process Emissionsmentioning

confidence: 99%

Sophorolipids Production from Oil Cake by Solid-State Fermentation. Inventory for Economic and Environmental Assessment

2021

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Biosurfactants are being proposed as a substitute for surfactants in the framework of a circular economy strategy. Sophorolipids (SL) are a type of biosurfactant produced by yeast that can be produced through submerged or solid-state fermentation (SSF) processes. Even though sophorolipids are being produced at full scale, through submerged fermentations, environmental and technoeconomic information regarding its production through SSF is unavailable. An inventory of data necessary to perform preliminary economic and environmental assessments is presented in this study. Data was obtained from three SSF processes at 22-L reactor volume and from two SSF processes at 100-L reactor volume, using winterization oil cake and molasses as substrates, wheat straw as support material, and Starmerella bombicola as SL producing yeast. The effect of increasing the operation scale was assessed. Besides presenting parameters such as inoculum production, initial mass of substrates, and airflow requirements; process emissions (NH3, Volatile Organic Compounds, N2O, SH2 and CH4) and the biogas potential of the spent fermentation solids were also presented.

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Section: Process Emissionsmentioning

confidence: 99%

Sophorolipids Production from Oil Cake by Solid-State Fermentation. Inventory for Economic and Environmental Assessment

2021

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“…This difference could be due to the particularly low VS consumption associated to their low temperature profiles. In addition, when comparing values reported in sludge co-biodrying studies, the use of co-substrates resulted in higher MC removal ratios in general, but also significantly higher VS consumption values, lowering in these cases the overall BI values (up to 6 kgH2O•kg -1 VS) (Hao et al, 2018;Zhang et al, 2018;González et al, 2019a).…”

Section: Process Performance Assessmentmentioning

confidence: 91%

“…Total Volatile Organic Compounds (tVOC), NH3 and H2S concentration in exhaust gas were measured in situ using a MultiRAE Lite analyser (RAE Systems). The extended sampling method and gas analysis can be found in González et al (2019a).…”

Section: Gas and Odour Emissions: Sampling And Analysismentioning

confidence: 99%

“…These maximum emissions were likely related to anaerobic conditions during the dewatering and shipping of raw materials (Han et al, 2018a). In fact, after adjusting the initial structure, porosity and moisture content of the material, N2O stored in sludge was probably stripped-out by forced aeration (Han et al, 2018a;González et al, 2019a) and was no longer detectable. CH4 emissions have been related to an inadequate mixture structure and insufficient oxygen supply, leading to anaerobic conditions (Maulini-Duran et al, 2013;Yuan et al, 2016).…”

Section: Ghg Emissionsmentioning

confidence: 99%

“…Regarding environmental performance, a lack of information in the literature exists in regards to gaseous emissions during the biodrying process, for both sewage sludge and Municipal Solid Waste (MSW) valorisation (Ragazzi et al, 2011;González et al, 2019a).…”

Section: Introductionmentioning

confidence: 99%

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Biomass fuel production from cellulosic sludge through biodrying: Aeration strategies, quality of end-products, gaseous emissions and techno-economic assessment

et al. 2021

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This study assesses the technological, environmental and economic feasibility of biodrying to valorise cellulosic sludge as a renewable energy source. Specifically, three different aeration strategies were compared in terms of biodrying performance, energetic consumption, gaseous emissions, quality of end-products and technoeconomic analysis. These strategies were based on different combinations of convective drying with biogenic heat produced. Two innovative biodrying performance indicators (Energetic Biodrying Index and Biodrying Performance Index) were proposed to better assess the initial and operational conditions that favour the maximum energy process efficiency and the highest end-product quality. The end-products obtained consistently presented moisture contents below 40% and lower heating values above 9.4 MJ•kg-1.However, the best values achieved were 32.6% and 10.4 MJ•kg-1 for moisture content and lower heating value, respectively. Low N2O and CH4 emissions confirmed the effective aeration of all three strategies carried out, while NH4 and tVOCs were related either to temperature or biological phenomena. A techno-economic analysis proved the economic viability and attractiveness of the biodrying technology for cellulosic sludge in all the strategies applied.

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Hazardous emission from thermal drying of municipal sludge and industrial sludge as well as associated odor pollution

Bao

Wang

2023

J Mater Cycles Waste Manag

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Filling in sewage sludge biodrying gaps: Greenhouse gases, volatile organic compounds and odour emissions

Cited by 26 publications

References 35 publications

Sophorolipids Production from Oil Cake by Solid-State Fermentation. Inventory for Economic and Environmental Assessment

Sophorolipids Production from Oil Cake by Solid-State Fermentation. Inventory for Economic and Environmental Assessment

Biomass fuel production from cellulosic sludge through biodrying: Aeration strategies, quality of end-products, gaseous emissions and techno-economic assessment

Hazardous emission from thermal drying of municipal sludge and industrial sludge as well as associated odor pollution

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