Anaerobic digestion of whey permeate: impact of feedstock ratio and organic loading rate in batch and semi-continuous systems

Heliyon, Год журнала: 2025, Номер 11(4), С. e42395 - e42395

Опубликована: Фев. 1, 2025

Anaerobic digestion (AD) plants have been facing significant challenges in maintaining a stable long-time operation when utilizing whey permeate as feedstock. In this study, we investigated the AD performance of under batch and semi-continuous stirred tank reactor (s-CSTR) systems to optimize process. Biochemical methane potential (BMP) tests were initially performed reactors assess substrate operating at different inoculum ratios (ISRs) pH values mesophilic temperatures. The kinetic parameters from best system assessed be used guideline for s-CSTR operational set ups. highest yield 653.64 ± 12.16 NLCH4kgVS -1 was observed ISR 2, initial 7.5 37 °C incubation system. However, condition applied determine organic loading rate (OLR) hydraulic retention times (HRT) s-CSTRs, resulted failure. s-CSTRs then operated OLR 2.5 4 gVSL-1d-1 with 30 d HRT 150 effect feeding regimes towards overall performance. CH4 production declined 3 HRTs all before stabilizing rest experiment. decline correlated volatile solids degradation, fatty acids microbial composition. Initially, acetogenic bacteria (e.g., Trichococcus Sedimentibacter) dominated digestate which shifted propionic acid producing Actinomyces Acidipropionibacterium) over course d. A change archaeal abundance also where abundant Methanosarcina finally substituted by Methanobacterium. population our suggests shift methanogenesis pathway, directly affects

Язык: Английский

---

Alleviation of propionic acid inhibition and enhancement of methane production in anaerobic digestion by micronano-bubble water supplementation

Bioresource Technology, Год журнала: 2025, Номер unknown, С. 132425 - 132425

Опубликована: Март 1, 2025

Язык: Английский

---

Anaerobic treatment of refractory industrial organic wastewater: A review of bioenergy recovery and low-carbon nitrogen removal toward carbon neutrality

Journal of Water Process Engineering, Год журнала: 2025, Номер 72, С. 107515 - 107515

Опубликована: Март 23, 2025

Язык: Английский

---

New insights of polyacrylamide on volatile fatty acid accumulation: Sludge crushing mechanism and microbial community function

Bioresource Technology, Год журнала: 2025, Номер 427, С. 132386 - 132386

Опубликована: Март 12, 2025

Язык: Английский

---

Alkaline Pre-Fermentation Promotes Anaerobic Digestion of Enhanced Membrane Coagulation (EMC) Sludge: Performance and Microbial Community Response

Water, Год журнала: 2024, Номер 16(14), С. 2057 - 2057

Опубликована: Июль 20, 2024

Concentrating organic matter in sludge and converting it into methane through anaerobic bioconversion can improve resource recovery from domestic wastewater. Enhanced membrane coagulation (EMC) is highly efficient at concentrating matter, but residual coagulants (aluminum salts) obstruct by blocking microbial access. Limited research exists on evaluating EMC performance addressing coagulant inhibition. This study proposes alkaline pre-fermentation to break down HO-Al-P backbones coagulated flocs, thereby improving hydrolysis acid production for digestion. Among the tested conditions (pH 9, pH 10, 11), 11 released most (4710.0 mg/L SCOD), 20.4 times higher than without treatment. At 11, phosphate (61 PO43−–P) (2728.1 mg COD/L, with nearly 50% acetic acid) peaked, resulting superior volatile solids removal (65.2%) (185.8 mL/g VS) during Alkaline favored alkali-tolerant bacteria such as Firmicutes Actinobacteria, especially while neutrophilic Proteobacteria were suppressed. Trichococcus Bifidobacterium, known producers, dominated under all conditions, their abundance increasing levels. Anaerobic digestion enriched fermentative like Chloroflexi Synergistota (e.g., Thermovirga), high reactors. Methanothrix, an acetoclastic methanogen, became dominant methanogenic archaeon, indicating that primarily followed methanogenesis pathway. Our findings demonstrate significantly enhances efficiency of recovery.

Язык: Английский

---

Targeted volatile fatty acid production based on lactate platform in mixed culture fermentation: Insights into carbon conversion and microbial metabolic traits

Bioresource Technology, Год журнала: 2024, Номер unknown, С. 131835 - 131835

Опубликована: Ноя. 1, 2024

Язык: Английский

---