Recovery of volatile fatty acids from fermentation of sewage sludge in municipal wastewater treatment plants

Longo, Stefano B.; Katsou, Evina; Malamis, Simos; Frison, Nicola; Renzi, D.; Fatone, Francesco

doi:10.1016/j.biortech.2014.09.107

Cited by 71 publications

(40 citation statements)

References 22 publications

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“…An average VFAs concentration of 9.8 g/L was achieved from the excess sewage sludge at a yield of 0.38 gVFA/g VS added (533 mgCOD/g VS added ), which is higher than the yield reported for uncontrolled pH systems and is comparable with systems with pH control. Longo et al [18] reported a VFAs yield of 252 mg COD/g VS added for the system without any pH control and 398 mg COD/g VS added for the system with pH control at 10 using caustic soda. Moreover, the composition of VFAs produced by this iMBR is well suited for the denitrification process.…”

Section: Vfas Production Using Immersed Membrane Bioreactormentioning

confidence: 99%

“…Moreover, the mixture of VFAs can be used directly as a carbon source for the denitrification process without downstream purification demands. Many studies have tested the effectiveness of VFAs as a carbon source for the denitrification process [13][14][15][16][17][18]. In this regard, VFAs higher denitrification rates have been reported compared to methanol.…”

Section: Introductionmentioning

confidence: 99%

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MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

et al. 2020

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The significant amount of excess sewage sludge (ESS) generated on a daily basis by wastewater treatment plants (WWTPs) is mainly subjected to biogas production, as for other organic waste streams such as food waste slurry (FWS). However, these organic wastes can be further valorized by production of volatile fatty acids (VFAs) that have various applications such as the application as an external carbon source for the denitrification stage at a WWTP. In this study, an immersed membrane bioreactor set-up was proposed for the stable production and in situ recovery of clarified VFAs from ESS and FWS. The VFAs yields from ESS and FWS reached 0.38 and 0.34 gVFA/gVSadded, respectively, during a three-month operation period without pH control. The average flux during the stable VFAs production phase with the ESS was 5.53 L/m2/h while 16.18 L/m2/h was attained with FWS. Moreover, minimal flux deterioration was observed even during operation at maximum suspended solids concentration of 32 g/L, implying that the membrane bioreactors could potentially guarantee the required volumetric productivities. In addition, the techno-economic assessment of retrofitting the membrane-assisted VFAs production process in an actual WWTP estimated savings of up to 140 €/h for replacing 300 kg/h of methanol with VFAs.

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Section: Vfas Production Using Immersed Membrane Bioreactormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

et al. 2020

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“…Recent studies utilised various reactor types (e.g., batch, continuous, microwave, fluidized bed and horizontal furnace), operating conditions (e.g., temperature, time, power and catalyst) and fuel (e.g., primary, digested, wet sludge and blends) for optimising pyrolytic product distribution and their quality as seen in Table 4 which summarises results from past studies. The bio-oil yield from sewage sludge pyrolysis ranges from 14-57.5 wt% [95][96][97][98][99][100][101][102][103][104][105]. Pokorna et al [105] reported a maximum bio-oil yield of 57.5 wt% with water content as low as 10 wt% when flash pyrolysis was conducted at 500 • C in a lab-scale semi-continuous reactor.…”

Section: Pyrolysismentioning

confidence: 99%

A Review of Sludge-to-Energy Recovery Methods

et al. 2018

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The increasing volume of sewage sludge from wastewater treatment facilities is becoming a prominent concern globally. The disposal of this sludge is particularly challenging and poses severe environmental hazards due to the high content of organic, toxic and heavy metal pollutants among its constituents. This study presents a simple review of four sewage to energy recovery routes (anaerobic digestion, combustion, pyrolysis and gasification) with emphasis on recent developments in research, as well as benefits and limitations of the technology for ensuring cost and environmentally viable sewage to energy pathway. This study focusses on the review of various commercially viable sludge conversion processes and technologies used for energy recovery from sewage sludge. This was done via in-depth process descriptions gathered from literatures and simplified schematic depiction of such energy recovery processes when utilised for sludge. Specifically, the impact of fuel properties and its effect on the recovery process were discussed to indicate the current challenges and recent scientific research undertaken to resolve these challenges and improve the operational, environmental and cost competitiveness of these technologies.

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“…Furthermore, it decreases sludge production by 30% and carbon dioxide emissions by 20% . Significant cost savings can further arise when fermented sewage sludge is supplied as carbon source to accomplish the denitrification process (Mayer et al 2009;Ji & Chen, 2010;Longo et al 2015). The NOB can be inhibited by maintaining a high free ammonia (FA) concentration (FA > 1 mgNH 3 ⋅ L −1 ) or high free nitrous acid (FNA > 0.02 mgHNO 2 -N L −1 ) concentration in the biological reactor Vadivelu et al 2007;.…”

Section: Innovative Bioprocesses In the Mainstream And Sidestreammentioning

confidence: 99%

“…According to the pilot-scale results, the best parameters for the alkaline fermentation of sewage sludge, the solid-liquid separation and the via-nitrite nutrients removal were found out (Longo et al 2015). The production of SCVFA by alkaline fermentation has proved to be highly dependent on pH and temperature.…”

Section: Scena System Integrated In Conventional Treatment Of Sementioning

confidence: 99%

Sewage Treatment Plants

2015

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Recovery of volatile fatty acids from fermentation of sewage sludge in municipal wastewater treatment plants

Cited by 71 publications

References 22 publications

MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

MBR-Assisted VFAs Production from Excess Sewage Sludge and Food Waste Slurry for Sustainable Wastewater Treatment

A Review of Sludge-to-Energy Recovery Methods

Sewage Treatment Plants

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