Valorization of biogas production through disintegration of waste activated sludge using visible light ZnO-ZnS/Ag2O-Ag2S photocatalyst

Anjum, Muzammil; Kumar, Rajeev; Al-Talhi, Hasan A.; Mohamed, Saleh A.; Barakat, M.A.

doi:10.1016/j.psep.2018.08.022

Cited by 19 publications

(2 citation statements)

References 48 publications

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“…The lowest COD removal (31%) was observed in CM1 and CM4 in case of untreated maize crop residues which is even lower than catering waste alone (control) where COD removal of 46% was found. The improved COD degradation with pre-treated maize crop residue was due to the fact that pretreatment provides more organics in solubilized form (sCOD) and thus more available to anaerobic bacteria (Anjum et al, 2018). Overall, these results showed that use of pre-treated crop residues is more promising with catering waste co-digestion where optimum mixing ration was found at 40% maize crop residue with 60% catering waste and labeled as TCM3.…”

Section: Anatical Methodsmentioning

confidence: 85%

Anaerobic Co-digestion of Catering and Agro-Industrial Waste: A Step Forward Toward Waste Biorefinery

2018

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In the present study, a biorefinery system is proposed using catering and agro industrial waste for biogas and low phytotoxic digestate. Anaerobic co-digestion of catering waste with partially pre-treated (microwave 800 J/g/min + steam 121 • C 40 min) maize crop residues was conducted under different composition (20-50%) of feedstock. The results showed that the biogas production was increased by 2.03 times in co-digestion experiment (40% partially pre-treated maize crop residue + 60% catering waste: TCM3) as compared to catering waste alone (control). The increment in accumulative methane 116.7 m 3 t −1 was recorded in TCM3 which is due to improvement in biodegradation under co-digestion process. The post digestion byproduct (residual digestate) was evaluated for its phytotoxicity which is supplied with aerobic post treatment. The post treatment has improved the digestate quality by decreasing VS/TS ratio from 259 to 173 g/L and slightly increase the pH from 7.29 to 8.32. Seed germination assay showed that the germination percentage (G%), germination index (GI) and vigor index (VI) were relatively higher with post treated digesate as compared to untreated digestate. In the germination test using wheat seeds, the post treated digestate (5% sol. extract) achieved higher values of GI and VI (46 and 609) whereas in untreated , values for these indices were 14 and 62, respectively. Overall the findings of the present study identify the significance co-digestion based waste biorefinery, in order to development of value added bio-products such as biogas and biofertilizers.

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Section: Anatical Methodsmentioning

confidence: 85%

Anaerobic Co-digestion of Catering and Agro-Industrial Waste: A Step Forward Toward Waste Biorefinery

2018

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“…185 As a nano photocatalyst, ZnO–ZnS/Ag 2 O–Ag 2 S decomposes waste-activated sludge and increases methane production by 54% through anaerobic digestion. 186 We cannot help but ask whether QDs as photocatalysts can achieve methanogenesis. Another study told us the answer that Rhodopseudomonas palustris hybridized with CdS QDs without significant damage, and its biomethanation performance was improved by about 79% compared to bare cells.…”

Section: Environmental Health Risks Of Qdsmentioning

confidence: 99%