Synergistic pretreatment of CaO and freezing/thawing to enhance volatile fatty acids recycling and dewaterability of waste activated sludge via anaerobic fermentation

She, Yuecheng; Wei, Wenxuan; Ai, Xiaohuan; Hong, Ji-Hyung; Xin, Xiaodong

doi:10.1016/j.chemosphere.2021.130939

Cited by 26 publications

(5 citation statements)

References 43 publications

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“…The total VFAs was 2391 mg COD L −1 on this day in the 200 mmol per kg VSS test, which was about 64% higher than the control (1457 mg COD L −1 ). This performance was similar to the VFAs production involving other pretreatments previously [ 34 , 35 ]. Apparently, the pretreatment significantly improved the VFAs production performance.…”

Section: Resultssupporting

confidence: 87%

Enhancing volatile fatty acids production from waste activated sludge: The role of pretreatment by N,N-bis(carboxymethyl)-l-glutamate (GLDA)

Liu,

Li,

et al. 2024

Environmental Science and Ecotechnology

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Section: Resultssupporting

confidence: 87%

Enhancing volatile fatty acids production from waste activated sludge: The role of pretreatment by N,N-bis(carboxymethyl)-l-glutamate (GLDA)

Liu,

Li,

et al. 2024

Environmental Science and Ecotechnology

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“…From the genus assignment results, the Bacteroides exhibited a higher proportion than other genera in A1 chamber on day 30 (Figure 5A), this was probably due to its enrichment could promote the degradation of glucose (Wang et al, 2021a). Notably, the Bacteroides was not observed on day 190, with greater abundances of Macellibacteroides, Trichococcus, and paraclostridium were observed in A1 chamber, their existences have been confirmed could help to degrade the organic matters (Yan et al, 2020;She et al, 2021;He et al, 2022). The changes in the microbial community within the A1 chamber may be attributed to changes in the influent conditions and environmental factors.…”

Section: Evolution Of the Microbial Communitymentioning

confidence: 95%

An efficient anoxic/aerobic/aerobic/anoxic process for domestic sewage treatment: From feasibility to application

et al. 2022

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In this paper, the anoxic/aerobic/aerobic/anoxic (AOOA) process was proposed using fixed biofilms in a continuous plug-flow multi-chamber reactor, and no sludge reflux operation was performed during the 190 days of operation. The reactor volume ratio of 1.5:2:1.5:1 (A/O/O/A) with the dissolved oxygen (DO) concentration of 2 mg L−1 in the aerobic zone was the optimal condition for reactor operation. According to the results obtained from the treatment of real domestic sewage, when the hydraulic retention time (HRT) was 6 h, the effluent of the reactor could meet the discharge standard even in cold conditions (13°C). Specifically, the elemental-sulfur-based autotrophic denitrification (ESAD) process contributed the most to the removal of total inorganic nitrogen (TIN) in the reactor. In addition, the use of vibration method was helpful in removing excess sludge from the biofilms of the reactor. Overall, the AOOA process is an efficient and convenient method for treating domestic sewage.

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“…The concentration and composition of VFAs were measured by Tianmei GC7980 (Shanghai, China) and flame ionization detector. The chromatographic conditions were as follows: injector temperature of 250°C, column temperature of 240°C, oven temperature increased to 170°C with a gradient of 20°C for 2 min, carrier gas of N 2 (50 ml/min) and H 2 (55 ml/min; She et al, 2021 ). The surface morphology of WAS attached to activated carbon and graphite before and after anaerobic digestion was obtained by a Field Emission Scanning Electron Microscopy (ZEISS, Germany).…”

Section: Methodsmentioning

confidence: 99%

“…The surface morphology of WAS attached to activated carbon and graphite before and after anaerobic digestion was obtained by a Field Emission Scanning Electron Microscopy (ZEISS, Germany). As previously mentioned ( She et al, 2021 ), the digestate samples were collected after sedimentation. The microbial community was measured by Illumina Miseq sequencing technique, following the procedures of DNA extraction, polymerase chain reaction (PCR), quantitative mixing and Miseq sequencing.…”

Section: Methodsmentioning

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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Synergistic pretreatment of CaO and freezing/thawing to enhance volatile fatty acids recycling and dewaterability of waste activated sludge via anaerobic fermentation

Cited by 26 publications

References 43 publications

Enhancing volatile fatty acids production from waste activated sludge: The role of pretreatment by N,N-bis(carboxymethyl)-l-glutamate (GLDA)

Enhancing volatile fatty acids production from waste activated sludge: The role of pretreatment by N,N-bis(carboxymethyl)-l-glutamate (GLDA)

An efficient anoxic/aerobic/aerobic/anoxic process for domestic sewage treatment: From feasibility to application

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

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