A review of sludge pretreatment methods and co-digestion to boost biogas production and energy self-sufficiency in wastewater treatment plants

Volschan, Isaac; Almeida, Ronei de; Cammarota, Magali Christe

doi:10.1016/j.jwpe.2020.101857

Cited by 55 publications

(46 citation statements)

References 157 publications

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“…Pretreatment methods are increasingly often used to improve the technological effectiveness of methane fermentation, as they allow enhancing biodegradability, increase the production of gaseous metabolites of anaerobic bacteria and methane concentration, enable an increase in the load of organic compounds, and reduce the hydraulic retention time in the technological system [ 22 ]. This allows reducing the total volume of the reactors and surface area needed for their location, reduces investment costs, and may lead to an improvement in the energy balance and ultimate economic effect [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Acid Whey Pretreatment Using Ultrasonic Disintegration on the Removal of Organic Compounds and Anaerobic Digestion Efficiency

Kazimierowicz

Zieliński

Bartkowska

et al. 2022

IJERPH

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Acid whey is a by-product of the dairy industry that should be utilized or appropriately neutralized. Anaerobic processes represent a group of prospective methods for whey processing, and a key priority in their development is to improve their technological and economical effectiveness. The present study aimed to determine the effect of ultrasonic disintegration (UD) of acid whey on the course and effectiveness of methane fermentation. The study results demonstrated that extending the UD duration resulted in increased concentrations of dissolved forms of COD and TOC, efficiency of organic matter biodegradation, and CH4 production. The best effects were achieved at 900 s US, including CH4 production of 0.203 ± 0.01 dm3/gCODin. and CH4 content accounting for 70.9 ± 2.8%. Organic compounds were removed with the following efficiencies: COD—78.7 ± 2.1%, TOC—80.2 ± 1.3%, and BOD5—84.1 ± 1.6%. The highest net energy gain of 5.763 Wh was achieved upon UD of 300 s. Extension of UD time had no significant effect on the improvement in the energetic effectiveness of anaerobic digestion. A strong positive correlation was found between COD and TOC concentrations in the dissolved phase and CH4 production yield.

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Section: Introductionmentioning

confidence: 99%

Effect of Acid Whey Pretreatment Using Ultrasonic Disintegration on the Removal of Organic Compounds and Anaerobic Digestion Efficiency

Kazimierowicz

Zieliński

Bartkowska

et al. 2022

IJERPH

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“…The effectiveness of pre-treatment methods is often evaluated by monitoring the changes in dissolved organics levels [ 56 ]. Various metrics can be used, depending on the organic feedstock used, including levels of volatile solids, genetic material, lipids, glucose and biodegradable organic compounds (expressed as biochemical oxygen demand (BOD)) [ 57 , 58 ].…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic Disintegration to Improve Anaerobic Digestion of Microalgae with Hard Cell Walls—Scenedesmus sp. and Pinnularia sp.

Dębowski

Kazimierowicz

Świca

et al. 2022

Plants

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Microalgae are considered to be very promising feedstocks for biomethane production. It has been shown that the structure of microalgal cell walls can be highly detrimental to the anaerobic digestibility of biomass. Therefore, there is a real need to seek ways to eliminate this problem. The aim of the present study was to assess the effect of ultrasonic disintegration of Scenedesmus sp. and Pinnularia sp. microalgal biomass on the performance and energy efficiency of anaerobic digestion. The pretreatment was successful in significantly increasing dissolved COD and TOC in the system. The highest CH4 yields were noted for Scenedesmus sp. sonicated for 150 s and 200 s, which produced 309 ± 13 cm3/gVS and 313 ± 15 cm3/gVS, respectively. The 50 s group performed the best in terms of net energy efficiency at 1.909 ± 0.20 Wh/gVS. Considerably poorer performance was noted for Pinnularia sp., with biomass yields and net energy gains peaking at CH4 250 ± 21 cm3/gVS and 0.943 ± 0.22 Wh/gVS, respectively. Notably, the latter value was inferior to even the non-pretreated biomass (which generated 1.394 ± 0.19 Wh/gVS).

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“…Several pre-treatment techniques, such as electrokinetic and ultrasonication pre-treatments, have been extensively evaluated for the pretreatment of biowastes at a lab-scale level. Many have shown promising results in the biogas yield compared to untreated after AD (Bundhoo and Mohee, 2018;Mirmohamadsadeghi et al, 2021;Volschan et al, 2021). These techniques have varying effects on the biogas yield and changes in biochemical properties of the digestate, depending on the biowastes used and the operation mechanism.…”

Section: Introductionmentioning

confidence: 99%

Effects of electrokinetic and ultrasonication pre-treatment and two-step anaerobic digestion of biowastes on the nitrogen fertiliser value by injection or surface banding to cereal crops

Nyang’au

Møller

Sørensen

2023

Journal of Environmental Management

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A review of sludge pretreatment methods and co-digestion to boost biogas production and energy self-sufficiency in wastewater treatment plants

Cited by 55 publications

References 157 publications

Effect of Acid Whey Pretreatment Using Ultrasonic Disintegration on the Removal of Organic Compounds and Anaerobic Digestion Efficiency

Effect of Acid Whey Pretreatment Using Ultrasonic Disintegration on the Removal of Organic Compounds and Anaerobic Digestion Efficiency

Ultrasonic Disintegration to Improve Anaerobic Digestion of Microalgae with Hard Cell Walls—Scenedesmus sp. and Pinnularia sp.

Effects of electrokinetic and ultrasonication pre-treatment and two-step anaerobic digestion of biowastes on the nitrogen fertiliser value by injection or surface banding to cereal crops

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