Search results for "Resource recovery from wastewater"

showing 3 items of 3 documents

Effect of organic loading rate on the production of Polyhydroxyalkanoates from sewage sludge

2023

The aim of this work was to study the effect of organic loading rate on the production of Polyhydroxyalkanoates (PHA) from sewage sludge. Synthesis of PHA using sewage sludge as platform was achieved in this work. Three pilot-scale selection-sequencing batch reactors (S-SBR) were used for obtaining a culture able to accumulate PHA following a strategy of aerobic dynamic feeding (ADF) at different volumetric organic-loading-rate (vOLR): 1.3, 1.8 and 0.8 g COD L-1 d-1 for S-SBR 1, S-SBR 2 and S-SBR 3, respectively. Decreasing the vOLR enhanced the general performance of the process as for organic matter removal (from 99.2% ± 0.3% in S-SBR-3 to 92 ± 2 in S-SBR-2) while the opposite trend was r…

HistoryEnvironmental EngineeringPolymers and PlasticsSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleGeneral MedicineBusiness and International ManagementManagement Monitoring Policy and LawWaste Management and DisposalIndustrial and Manufacturing EngineeringAerobic dynamic feeding Polyhydroxyalkanoates Resource recovery from wastewater Selection Sequencing batch reactor Sewage sludge
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Influence of volatile solids and pH for the production of volatile fatty acids: batch fermentation tests using sewage sludge

2021

The aim of this work was to study the effect of volatile suspended solid (VSS) and pH on volatile fatty acids (VFA) production from waste activated sludge (WAS) fermentation by means of batch tests. The final goal was to gain insights to enhance VFA stream quality, with the novelty of using WAS with high sludge retention time. Results revealed that the optimum conditions to maximize VFAs and minimize nutrients and non-VFA sCOD are a VSS concentration of 5.9 g/L and initial pH adjustment to pH 10. The WAS bacterial community structures were analysed according to Next Generation Sequencing (NGS) of 16S rDNA amplicons. The results revealed changes of bacterial phyla abundance in comparison wit…

Environmental EngineeringCircular economyBatch fermentation0207 environmental engineeringBioengineering02 engineering and technology010501 environmental sciences01 natural sciencesBioreactorsNutrientVolatile fatty acidsResource recovery from wastewater020701 environmental engineeringWaste Management and Disposal0105 earth and related environmental sciencesSuspended solidsSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleBacteriaSewageRenewable Energy Sustainability and the EnvironmentChemistryGeneral MedicineHydrogen-Ion ConcentrationOther Quantitative Biology (q-bio.OT)Fatty Acids VolatilePulp and paper industry6. Clean waterQuantitative Biology - Other Quantitative BiologyActivated sludgeFOS: Biological sciencesFermentationFermentationBacterial communityRetention timeSludge
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Sewage sludge acidogenic fermentation for organic resource recovery towards carbon neutrality: an experimental survey testing the headspace influence

2022

Volatile fatty acids (VFAs) produced by acidogenic digestion of sewage sludge are very interesting bio-products which can contribute to carbon neutrality of wastewater treatment plants. Studies on the production of VFAs from sewage sludge from fermenters with membrane are limited. In view of above, VFAs from a fermenter pilot plant equipped with a membrane bioreactor and fed with real sewage sludge has been monitored. The effect of headspace volume (HdV) on VFA production was studied for the first time to elucidate the optimal operation conditions. Specifically, three fermenter HdV values (namely, 20, 40 and 60% of the total volume) have been investigated. Results revealed that the HdV of 2…

Environmental EngineeringSewageSettore ICAR/03 - Ingegneria Sanitaria-AmbientaleRenewable Energy Sustainability and the EnvironmentBioengineeringGeneral MedicineHydrogen-Ion ConcentrationFatty Acids VolatileCarbonBioreactorsFermentationAnaerobic digestion Headspace effects Resource recovery from wastewater Sewage sludge Volatile fatty acidsWaste Management and DisposalAcids
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