Enhanced production of biohydrogen from dairy waste activated sludge pre-treated using multi hydrolytic garbage enzyme complex and ultrasound-optimization

Arun, C.; Sivashanmugam, P.

doi:10.1016/j.enconman.2018.02.095

Cited by 40 publications

(5 citation statements)

References 37 publications

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“…were the dominant microflora in the fermented substrate. Arun and Sivashanmugam [ 49 ] also confirmed the positive effects of ultrasonication pre-treatment on dark fermentation. A 10 mL/g VS increase in the yield of hydrogen was observed in ultrasound pre-treated dairy waste as compared with untreated waste.…”

Section: Ultrasound-assisted Production Of Bio-energy Products From F...mentioning

confidence: 83%

Ultrasonic Processing of Food Waste to Generate Value-Added Products

Yao

Narale

et al. 2022

Foods

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Ultrasonic processing has a great potential to transform waste from the food and agriculture industry into value-added products. In this review article, we discuss the use of ultrasound for the valorisation of food and agricultural waste. Ultrasonic processing is considered a green technology as compared to the conventional chemical extraction/processing methods. The influence of ultrasound pre-treatment on the soluble chemical oxygen demand (SCOD), particle size, and cell wall content of food waste is first discussed. The use of ultrasonic processing to produce/extract bioactives such as oil, polyphenolic, polysaccharides, fatty acids, organic acids, protein, lipids, and enzymes is highlighted. Moreover, ultrasonic processing in bioenergy production from food waste such as green methane, hydrogen, biodiesel, and ethanol through anaerobic digestion is also reviewed. The conversion of waste oils into biofuels with the use of ultrasound is presented. The latest developments and future prospective on the use of ultrasound in developing energy-efficient methods to convert food and agricultural waste into value-added products are summarised.

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Section: Ultrasound-assisted Production Of Bio-energy Products From F...mentioning

confidence: 83%

Ultrasonic Processing of Food Waste to Generate Value-Added Products

Yao

Narale

et al. 2022

Foods

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“…In some processing plants, mixing of DPS generated from aerobic biological wastewater treatment and DAF processes occurs before land application or further disposal processing. A few of the examined plants have anaerobic digesters (AD) that produced The values are collected from peer reviewed articles where data were given in form of range, mean, or median values (1: Arun and Sivashanmugam, 2018;2: Ashekuzzaman et al, 2019a;3: Ashekuzzaman et al, 2021b;4: Carta-Escobar et al, 2004;5: Carvalho et al, 2013;6: Demirel et al, 2005;7: Ferreira et al, 2021;8: Frac et al, 2012;9: Gayathri et al, 2015;10: Gogoi et al, 2021;11: Sommer et al, 2013;12: Rani et al, 2012;13: Yadav et al, 2009). AD sludge.…”

Section: Wastewater Volumes and Contentsmentioning

confidence: 99%

Systematic Review of Dairy Processing Sludge and Secondary STRUBIAS Products Used in Agriculture

Khomenko

Shi

et al. 2021

Front. Sustain. Food Syst.

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Worldwide dairy processing plants produce high volumes of dairy processing sludge (DPS), which can be converted into secondary derivatives such as struvite, biochar and ash (collectively termed STRUBIAS). All of these products have high fertilizer equivalent values (FEV), but future certification as phosphorus (P)-fertilizers in the European Union will mean they need to adhere to new technical regulations for fertilizing materials i.e., content limits pertaining to heavy metals (Cd, Cu, Hg, Ni, Pb, and Zn), synthetic organic compounds and pathogens. This systematic review presents the current state of knowledge about these bio-based fertilizers and identifies knowledge gaps. In addition, a review and calculation of greenhouse gas emissions from a range of concept dairy sludge management and production systems for STRUBIAS products [i.e., biochar from pyrolysis and hydrochar from hydrothermal carbonization (HTC)] is presented. Results from the initial review showed that DPS composition depends on product type and treatment processes at a given processing plant, which leads to varied nutrient, heavy metal and carbon contents. These products are all typically high in nutrients and carbon, but low in heavy metals. Further work needs to concentrate on examining their pathogenic microorganism and emerging contaminant contents, in addition to conducting an economic assessment of production and end-user costs related to chemical fertilizer equivalents. With respect to STRUBIAS products, contaminants not present in the raw DPS may need further treatment before being land applied in agriculture e.g., heated producing ashes, hydrochar, or biochar. An examination of these products from an environmental perspective shows that their water quality footprint could be minimized using application rates based on P incorporation of these products into nutrient management planning and application by incorporation into the soil. Results from the concept system showed that elimination of methane emissions was possible, along with a reduction in nitrous oxide. Less carbon (C) is transferred to agricultural fields where DPS is processed into biochar and hydrochar, but due to high recalcitrance, the C in this form is retained much longer in the soil, and therefore STRUBIAS products represent a more stable and long-term option to increase soil C stocks and sequestration.

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“…In another study involving a biochemical methane potential (BMP) assay, sonication was found to increase biogas production further at low food-to-microorganism (F/M) ratios (Braguglia et al 2012b). Arun and Sivashanmugam (2018) stated that sonication at 0.6 W/mL increased the solubilization of organics. Yet, these studies have focused on biogas yields and improvements on digestion while generally disregarding whether the energy used for pretreatment could be regained afterwards.…”

Section: Introductionmentioning

confidence: 99%

Effects of anaerobic digestion enhanced by ultrasound pretreatment on the fuel properties of municipal sludge

Çelebi

Aksoy

Sanin

2020

Environ Sci Pollut Res

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In this study, effects of ultrasound pretreatment on combustion characteristics and elemental composition of municipal sludge were examined for energy-based evaluation of sludge pretreatment. Waste activated sludge (WAS) from a municipal wastewater treatment plant was pretreated with ultrasound at varying durations and was subjected to anaerobic digestion in a biochemical methane potential (BMP) assay. Changes in gas production rates, calorific value (CV), elemental compositions, and ash contents of sludge samples were examined to assess the effects of pretreatment and digestion. Sonication at 0.73 W/mL enhanced gas production by 28%. Moreover, volatile solids (VS) and chemical oxygen demand (COD) removals increased from 41 to 45% and 33 to 37%, respectively. Following anaerobic digestion, CVs of samples decreased by about 18%. Sonicated samples exhibited a higher decrease. In order to quantify the change in overall energy content, total solids (TS) reduction was also taken into account. Loss was magnified as both CVand the amount of TS that would provide the overall energy were reduced. This loss was 38% for the control group and 41% for the 15 min sonicated sludge. Digestion decreased the C content of sludge by about 20% and H content by 50% due to biogas production. Ash content increased relatively as some of the combustible solids were lost due to digestion. Experimental results indicate that if sludge is to be combusted, digestion with or without ultrasound pretreatment may be disadvantageous if the aim is to maximize energy gain from sludge.

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Enhanced production of biohydrogen from dairy waste activated sludge pre-treated using multi hydrolytic garbage enzyme complex and ultrasound-optimization

Cited by 40 publications

References 37 publications

Ultrasonic Processing of Food Waste to Generate Value-Added Products

Ultrasonic Processing of Food Waste to Generate Value-Added Products

Systematic Review of Dairy Processing Sludge and Secondary STRUBIAS Products Used in Agriculture

Effects of anaerobic digestion enhanced by ultrasound pretreatment on the fuel properties of municipal sludge

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