Enhanced anaerobic digestion of primary sludge with additives: Performance and mechanisms

Xie, Sihuang; Li, Xuan; Wang, Chengduan; Kulandaivelu, Jagadeeshkumar; Jiang, Guangming

doi:10.1016/j.biortech.2020.123970

Cited by 48 publications

(14 citation statements)

References 45 publications

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“…The even higher methane production for PCAS compared to PAS, and the high productivity of PCS is partially attributed to the additional organic load of the cationic polyelectrolyte. Xie et al [41] also investigated the digestion of primary sludge with additives using BMP tests at SIR equal to 1.5:1 and found that specific methane yields increased from 136 mL/g VS for primary sludge to 146, 151, and 152 mL/g VS for the addition of nano magnetite, graphite powder, and activated carbon powder at optimal dosages, respectively, after 10 days of digestion. These results indicate higher methane production potential when attapulgite is used with PS.…”

Section: Discussionmentioning

confidence: 99%

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Sakaveli

Petala

Tsiridis

et al. 2021

Water

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Processing of the produced primary and secondary sludge during sewage treatment is demanding and requires considerable resources. Most common practices suggest the cotreatment of primary and secondary sludge starting with thickening and anaerobic digestion. The aim of this study is to investigate the anaerobic digestion of the primary sludge only and estimate its impact on sludge treatment and energy recovery. Within this context, the performance of the anaerobic digestion of primary sludge is explored and focused on practices to further enhance the methane production by using additives, e.g., a cationic polyelectrolyte and attapulgite. The results showed that the overall yield in methane production during anaerobic digestion of primary sludge alone was higher than that obtained by the anaerobic digestion of mixed primary and secondary sludge (up to 40%), while the addition of both organic polyelectrolyte and attapulgite enhanced further the production of methane (up to 170%). Attapulgite increased the hydrolysis rate of biosolids and produced relatively stabilized digestate, though of lower dewaterability. Moreover, the results suggest that single digestion of primary sludge may accomplish higher methane production capacities at lower digestors’ volume increasing their overall efficiency and productivity, while the produced digestates are of adequate quality for further utilization mainly in agricultural or energy sectors.

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Section: Discussionmentioning

confidence: 99%

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Sakaveli

Petala

Tsiridis

et al. 2021

Water

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“…The VFAs concentration in the blank group was 2,308 mg/L, while the VFAs concentration in the 16 mesh-, 50 mesh-, 100 mesh-, and 200 mesh-bottles in graphite group arrived to 2,237, 2,154, 1920, 1959, and 1890 mg/l, respectively, which was 3.1%, 6.7%, 16.8%, 15.1%, and 18.1% lower than that in the blank group. Adding graphite can accelerate the consumption of hydrolytic acidification products, thus significantly promoting the methanogenesis process ( Lu C et al, 2020 ; Xie et al, 2020 ). It was reported that the proportion of main products in glucose acidogenesis (acetate, propionate, butyrate, etc) was affected by various operating factors such as pH, temperature, and hydraulic retention time ( Xu et al, 2014 ).…”

Section: Resultsmentioning

confidence: 99%

Effect of activated carbon/graphite on enhancing anaerobic digestion of waste activated sludge

Xie²,

Xin³

et al. 2022

Front. Microbiol.

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The conductive media was capable to enhance anaerobic digestion and promote direct interspecific electron transfer (DIET). In this study, the effects of activated carbon- and graphite-conductive media on promoting anaerobic digestion efficiency of waste activated sludge were experimentally studied. The results show that the 100 mesh-activated carbon group reactor produced a largest biogas yield of 468.2 mL/g VSS, which was 13.8% higher than the blank test. The graphite group reactor with 400-grain size produced a largest biogas yield of 462.9 mL/g VSS, which was 12.5% higher than the blank test. Moreover, the optimal particle size of such two carbon- conductive mediators were optimized for enhancing degradation efficiency of VSS, TCOD, total protein and total polysaccharide of waste sludge. Activated carbon was capable to promote the hydrolytic acidification stage in anaerobic digestion of waste sludge. When the particle size reduced to the optimal particle size, the promoting effect could be strengthened for producing more hydrolytic acidification products for methanogenesis. However, in the graphite group, the methane production is increased by promoting the consumption of hydrolysis and acidification products and is enhanced with the particle size reduction, thus promoting the methanogenesis process, and improving the anaerobic digestion efficiency. Microbial community analysis showed that both activated carbon and graphite cultivated the genera of Methanosaeta, Methanobacterium, Nitrososphaeraceae, which promoted the improvement of methane production through the acetate debris methanogenesis pathway.

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“…In sample A1 the principals phyla found from Bacteria order was: (∼25%) Bacteroidota , (∼15%) Cloacimonadota , (∼50%) Firmicutes and (∼2%) Spirochaetota . Microorganisms of the phylum Bacteroidota, Cloacimonadota , and Spirochaetota are generally found in mesophilic processes and are bacteria responsible for the fermentative and hydrolytic steps of AD (Xie et al, 2020; Zhang et al, 2021). The presence of these three phyla in the A1 sample and the absence of them in the A2 sample indicates how temperature influenced the change in the bacterial community since the A1 inoculum comes from a mesophilic process.…”

Section: Resultsmentioning

confidence: 99%

Fe₃O₄nanoparticles to optimize the co-digestion of vinasse, filter cake, and deacetylation liquor: operational aspects and microbiological routes

Volpi

Mockaitis

Bruant

et al. 2022

Preprint

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The co-digestion of residues from the sugarcane industry has already proven to be a highly attractive process for biogas production through anaerobic digestion (AD). The use of residues such as vinasse (1G) filter cake (1G) and deacetylation liquor (2G) in operation in a continuous CSTR reactor showed a possibility of integration of 1G and 2G ethanol biorefineries through AD in previous work by our research group. The use of nanoparticles (NP) is a favorable way to optimize AD processes, as these additives serve as a means of introducing nutrients into the process in a more assertive way from the point of view of distribution and interaction with microorganisms. In this context, the present work proposed the optimization of the co-digestion of vinasse, filter cake, and deacetylation liquor in a continuous reactor through the addition of Fe3O4 NP, by the purpose of comparison results with the operation of the same substrates and the same condition but without NP. Initially, tests were carried out in batches with different concentrations of NPs, to evaluate the best concentration to be added in the continuous reactor. A concentration of 5 mg L-1 was chosen, and it was added to each increase in organic rate load (ORL) used in the process. CH4 production reached maximum values of 2.8 ± 0.1 NLCH4 gVS-1 and organic matter removal 71 ± 0.9%, in phase VI, with ORL of 5.5 gVS L-1 day-1. This production was 90% higher than the reactor co-digestion operation without the presence of NP. Furthermore, according to the results of pH, alkalinity, it can be concluded that the methanogenesis stabilized at 60 days of operation, being 30 days before when there was no NP added. The development of AD was stable, with low variations in the oxidation-reduction potential (ORP) and with stable organic acid (OA) concentrations, indicating the possibility of route propionic acid to produce CH4. The main methanogenic Archeae found was Methanoculleus, indicating that the predominant metabolic route was that of syntrophic acetate oxidation (SAO) coupled with hydrogenotrophic methanogenesis. The use of Fe3O4 NP managed to improve the AD operation of residues from the 1G2G ethanol production industry and did not modify the microbial community present, only stimulated their growth.

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Enhanced anaerobic digestion of primary sludge with additives: Performance and mechanisms

Cited by 48 publications

References 45 publications

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Effect of activated carbon/graphite on enhancing anaerobic digestion of waste activated sludge

Fe₃O₄nanoparticles to optimize the co-digestion of vinasse, filter cake, and deacetylation liquor: operational aspects and microbiological routes

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Enhanced anaerobic digestion of primary sludge with additives: Performance and mechanisms

Cited by 48 publications

References 45 publications

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Enhanced Mesophilic Anaerobic Digestion of Primary Sewage Sludge

Effect of activated carbon/graphite on enhancing anaerobic digestion of waste activated sludge

Fe3O4nanoparticles to optimize the co-digestion of vinasse, filter cake, and deacetylation liquor: operational aspects and microbiological routes

Contact Info

Product

Resources

About

Fe₃O₄nanoparticles to optimize the co-digestion of vinasse, filter cake, and deacetylation liquor: operational aspects and microbiological routes