Synergistic Impact of Nanoscale Zero-Valent Iron in Anaerobic Co-digestion Treatment and Biogas Upgrading from the Organic Fraction of Municipal Solid Waste-Activated Sludge

Al Rabadi, Said Jereis; Al bkoor Alrawashdeh, Khalideh; Alawamleh, Heba; Al-Samrraie, La’aly A.; Al-Tabbal, Jalal A.

doi:10.1007/s12649-023-02251-z

Cited by 3 publications

(2 citation statements)

References 53 publications

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“…It is also more economical and does not require additional treatment. Previous studies have extensively studied the use of zero-valent iron in wastewater treatment, showcasing its effectiveness in treating difficult wastewater, such as that contaminated with arsenic, phenol, dyes, and nitrate-eutrophicated water [8,15,16]. In recent years, nanometer zero-valent iron (nZVI) has gained attention due to its finer particle size, larger specific surface area, higher reactivity, and easy oxidization.…”

Section: Introductionmentioning

confidence: 99%

“…Despite these drawbacks, the iron reduction method remains a popular choice as it does not have any specific environ-mental requirements other than pH regulation. Currently, there are several improvement measures that have been proposed, suggesting that using zero-valent iron with auxiliary methods to remove nitrate from water is an emerging research area [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Water Purification Using Active Charcoal with Microbes and Chelated Iron Soaked into Its Micropores

Xu,

Cai,

Kong

et al. 2023

Sustainability

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Urbanization in China has led to a significant increase in surface water pollution, posing a threat to the health and safety of residents and hindering sustainable economic development. Individual traditional methods have been used to purify polluted water, including the use of bamboo-derived activated charcoal, microbial material, and zero-valent iron. However, these methods have been found to have certain limitations. This study investigates the effects of an activated charcoal material combined with beneficial microbes and chelated nano-iron in removing nitrates. The experiments were conducted at various scales, including a bench-scale study, and studies of a small river, sewage plant tailwater, and artificially constructed wetlands. The microbes used included Bacillus spp., Lactobacillus spp., and yeasts. During the fermentation process, nano-scale iron powder was added, resulting in the formation of bivalent iron ions under anaerobic conditions. These ions were subsequently chelated by organic acids. Bamboo-derived activated charcoal was then soaked in the fermented liquid, allowing the microbes, chelated iron ions, and organic acids to infiltrate the pores of the activated charcoal. This activated charcoal material, containing microbes and chelated iron ions, demonstrated effective nitrate removal in laboratory experiments and sewage plant tailwater treatment, and water purification in wetlands and rivers. It is important to note that this research solely focused on the removal of nitrates, and further studies are required to confirm its effectiveness in other aspects of water purification.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water Purification Using Active Charcoal with Microbes and Chelated Iron Soaked into Its Micropores

Xu,

Cai,

Kong

et al. 2023

Sustainability

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Phosphorus and bioenergy recovery from anaerobic co-digestion of food waste and corn residues with digested sludge: effect of HRT and pre-treatment methods

Khaita,

Chinwetkitvanich,

Polprasert

et al. 2024

Clean Techn Environ Policy

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Organic wastes from the human ecosystem including food waste (FW), agricultural waste and digested sludge (DS) from wastewater treatment can be utilized as valuable materials in anaerobic co-digestion (AcoD) for the dual purpose of bioenergy production and phosphorus (P) recovery through a chemical precipitation process. In this study, AcoD using FW and corn residues (CS) with DS for simultaneous sustainable phosphate release and biogas production were investigated. Different hydraulic retention times (HRT) of 10, 20, and 30 days were investigated, and FW was grinded, while CS pre-treatment methods including physical (FWCS), chemical (FWCS-Chem), and thermal (FWCS-Temp) were considered. The substrates of FW and CS compositions were conducted with a total organic loading of 6 g volatile solids (VS)/L/d (5 FW/1 CS) with a carbon-to-nitrogen ratio (C/N) of 24. The results indicate that FWCS-Chem showed the highest cumulative biogas production simultaneously with P release at HRT 20 days with 7279 L/m3 and 29.67%, respectively. Moreover, the effluent from all digesters exhibited a Mg/P ratio above 1, suitable for struvite precipitation without an external Mg source. Accordingly, FW, FWCS, and FWCS-Chem achieved P recovery rates of 63.64%, 69.75%, and 70.19% at 20-day HRT, with corresponding P contents in solids of 9.45, 9.43, and 8.29%, respectively. These values are comparable to commercial phosphate fertilizer containing 8.80% P. Moreover, incinerating the precipitating solids offers high-quality P concentrations in solids of up to 15.52, 16.32, and 16.31%, respectively. Hence, 20-day HRT was found to be the optimal condition for FW, CS, and DS for anaerobic co-digestion, resulting in the highest biogas production, P release, and maximum financial return for P recovery. Graphical abstract Phosphorus and bioenergy recovery from anaerobic co-digestion of food waste and corn residues with digested sludge.

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Correlation between kinetic parameters, reactor performance, and biogas and methane potential of co-digestion and mono-digestion of active sludge and olive mill wastewater

Al bkoor Alrawashdeh,

Al-Sameraie,

Al Bsoul

et al. 2024

International Journal of Low-Carbon Technologies

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Anaerobic co-digestion(AcoD) of active sludge (AS) and olive mill wastewater (OMW) is becoming an increasingly recognized alternative to manage waste and generate renewable energy. A kinetic study of the performance of biochemical methane potential (BMP) and continuous stirred tank reactors (CSTR) bioreactors was conducted to identify critical parameters influencing. Substrates of 100%OMW, 100%AS, 25:75%, 75:25%, and 50:50 were utilized in the BMP and CSTR digesters. To identify the optimum mixing, BMP tests were conducted under three different operating conditions: no mixing (NM), low-continuous mixing intensity (LM) of 25 rpm, and high continuous mixing intensity (HM) of 60 rpm. CSTR with an optimum mixing regime is utilized to identify the optimum substrate. In particular, the removal efficiency of volatile solids (VSs), total chemical oxygen demand (TCOD), and the production of biogas and methane (CH4) were investigated to specify the performance of the anaerobic digestion (AD) process. The results revealed that the optimum mixing regime is LM with BMP tests. Also, the maximum performance in CSTR-ML was achieved by 75:25 AS:OMW, 0.339 Nm3/kg VS of biogas, 69.89% of CH4, and a removal efficiency of 87.12% of VS and 79.23% of TCOD. For BMP tests, the biogas and CH4 yield production kinetics were best fitted by the modified Gompertz models: mono-digestion and co-digestion 75:25 and 50:50 of AS:OMW, while the best-fit model for co-digestion 25:75 was achieved by the transfer model. The production kinetics were well described by modified Gompertz models in CSTR tests. These results point to the possibility of optimizing digester systems on a wide scale using the outputs that have been observed. Novelty statement. This research work provides novel insights into the performance of the digester under diverse mixing conditions and varying co-substrate concentrations of AS:OMW and presents the best model to predicate the biogas and CH4 at various operation conditions.

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Synergistic Impact of Nanoscale Zero-Valent Iron in Anaerobic Co-digestion Treatment and Biogas Upgrading from the Organic Fraction of Municipal Solid Waste-Activated Sludge

Cited by 3 publications

References 53 publications

Water Purification Using Active Charcoal with Microbes and Chelated Iron Soaked into Its Micropores

Water Purification Using Active Charcoal with Microbes and Chelated Iron Soaked into Its Micropores

Phosphorus and bioenergy recovery from anaerobic co-digestion of food waste and corn residues with digested sludge: effect of HRT and pre-treatment methods

Correlation between kinetic parameters, reactor performance, and biogas and methane potential of co-digestion and mono-digestion of active sludge and olive mill wastewater

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