Effect of ultrasonic and ozonation pretreatment on methane production potential of raw molasses wastewater

Mischopoulou, Magdalini; Naidis, Panagiotis; Kalamaras, Sotirios D.; Κωτσόπουλος, Θωμάς; Samaras, P.

doi:10.1016/j.renene.2015.11.060

Cited by 41 publications

(14 citation statements)

References 24 publications

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“…These figures are quite promising, considering challenges that incur from the organic carbon removal in the downstream treatment units. Pre-ozonation, UV-irradiation, UV/H 2 O 2 and Fenton-oxidation as a possible pretreatment steps (which are expensive too) has shown < 20 % -35 % of COD removal and that too under longer contact time (25 minutes) than usual (Muhammad et al, 2008;Mischopoulou et al, 2016) [42,43].…”

Section: Scale-up Fbbr and Comparative Scenarios In Dwtp Applicationmentioning

confidence: 99%

Novel fluidized-bed biofilm reactor for concomitant removal of microcystin-LR and organics

Kumar

Hegde

Brar

et al. 2019

Chemical Engineering Journal

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Fluidized bed biofilm reactor (FBBR) was evaluated for the removal of microcystin-LR (MC-LR) from drinking water-sludge (0.3 % w/v). Biofilm formed inside the solid media carriers (biocarriers) were studied for the MC-LR degradation in FBBRs via known MC-LR degraders: Arthrobacter ramosus (reactor A: RA) and Bacillus sp. (reactor B: RB), along with the heterogeneous bacterial community (HBC) present in the sedimentation-unit sludge as a background matrix. Their ability to form biofilm inside the immobilized biocarriers was periodically quantified for over 300 days to determine the duration of mature biofilm growth, sloughing event and then re-maturation. The bioreactor performance was mainly evaluated in 2 terms of MC-LR, nitrate, nitrite, ammonia removal, and soluble-chemical oxygen demand (s-COD) removal. Biological degradation of MC-LR showed significant role over the physical adsorption, as the removal efficiency increased by around 30 % and 26 % for RA and RB respectively, as compared to the control bioreactor RD (without any bacterial cells) and an increase by over 15 % and 11 % when compared to reactor RC (contained only HBC). Mass spectra analysis for RA, RB, and RC strengthen the possibility of a toxic-free degradation mechanism. Overall, RA showed the best MC-LR removal efficiency of around 93.7 %, which comprised no MC-LR in the supernatant phase and around 3 µg/L in the sludge-mixture phase. Toxicity assessment of biodegraded sample (using bioindicator) further revealed the toxic-free nature by RA with more than 80 % removal for ammonia, nitrate, and nitrite. Scale-up of laboratory scale FBBR (2 L) is also proposed to handle 200 m 3 of feed water per day based on a similar volumetric mass transfer coefficient (kLa) to study the feasible process economics.

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Section: Scale-up Fbbr and Comparative Scenarios In Dwtp Applicationmentioning

confidence: 99%

Novel fluidized-bed biofilm reactor for concomitant removal of microcystin-LR and organics

Kumar

Hegde

Brar

et al. 2019

Chemical Engineering Journal

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“…47 To our knowledge, the ultrasound contributes to the improvement of the ozone transfer performance. 48 As observed in Fig. 8(a) and Table 8, it was demonstrated that increasing the ultrasonic power (from 1000 to 2000 W) has a positive effect on the dissolved ozone concentration.…”

Section: Effects Of Operating Parameters On the Ozone Mass Transfermentioning

confidence: 59%

The enhancement of ozone–liquid mass transfer performance in a PTFE hollow fiber membrane contactor using ultrasound as a catalyzer

et al. 2021

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“…They found that using a low-frequency US enhanced both biogas production by about 20% and methane content in biogas. In other studies [23], US was used to support methane production from raw molasses wastewater; 441.6 L CH4/kg VS was obtained. The results demonstrated that US may be a suitable solution for treating this kind of wastewater.…”

Section: Biogas Yield and Its Compositionmentioning

confidence: 99%

Evaluation of Anaerobic Digestion of Dairy Wastewater in an Innovative Multi-Section Horizontal Flow Reactor

et al. 2020

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The aim of this study was the performance evaluation of anaerobic digestion of dairy wastewater in a multi-section horizontal flow reactor (HFAR) equipped with microwave and ultrasonic generators to stimulate biochemical processes. The effects of increasing organic loading rate (OLR) ranging from 1.0 g chemical oxygen demand (COD)/L·d to 4.0 g COD/L·d on treatment performance, biogas production, and percentage of methane yield were determined. The highest organic compounds removals (about 85% as COD and total organic carbon—TOC) were obtained at OLR of 1.0–2.0 g COD/L·d. The highest biogas yield of 0.33 ± 0.03 L/g COD removed and methane content in biogas of 68.1 ± 5.8% were recorded at OLR of 1.0 g COD/L·d, while at OLR of 2.0 g COD/L·d it was 0.31 ± 0.02 L/COD removed and 66.3 ± 5.7%, respectively. Increasing of the OLR led to a reduction in biogas productivity as well as a decrease in methane content in biogas. The best technological effects were recorded in series with an operating mode of ultrasonic generators of 2 min work/28 min break. More intensive sonication reduced the efficiency of anaerobic digestion of dairy wastewater as well as biogas production. A low nutrient removal efficiency was observed in all tested series of the experiment, which ranged from 2.04 ± 0.38 to 4.59 ± 0.68% for phosphorus and from 9.67 ± 3.36 to 20.36 ± 0.32% for nitrogen. The effects obtained in the study (referring to the efficiency of wastewater treatment, biogas production, as well as to the results of economic analysis) proved that the HFAR can be competitive to existing industrial technologies for food wastewater treatment.

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Effect of ultrasonic and ozonation pretreatment on methane production potential of raw molasses wastewater

Cited by 41 publications

References 24 publications

Novel fluidized-bed biofilm reactor for concomitant removal of microcystin-LR and organics

Novel fluidized-bed biofilm reactor for concomitant removal of microcystin-LR and organics

The enhancement of ozone–liquid mass transfer performance in a PTFE hollow fiber membrane contactor using ultrasound as a catalyzer

Evaluation of Anaerobic Digestion of Dairy Wastewater in an Innovative Multi-Section Horizontal Flow Reactor

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