Response of a continuous biomethanation process to transient organic shock loads under controlled and uncontrolled pH conditions

Kim, Jaai; Lee, Changsoo

doi:10.1016/j.watres.2015.01.015

Cited by 37 publications

(10 citation statements)

References 30 publications

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“…Our data given in Fig. show that an increase in the volume load was accompanied by a rapid decrease of the pH as it has been reported by others as well . This pH change was also reflected by a reduction in the surface charge of the digester sludge samples (Fig.…”

Section: Discussionsupporting

confidence: 87%

Comparative evaluation of sludge surface charge as an indicator of process fluctuations in a biogas reactor

Winde

Berghoff

Schories

et al. 2018

Engineering in Life Sciences

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The current political situation imposes high demands on the economic feasibility of biogas plants. High prizes for biogas substrates and a trend to reduced feed‐in tariffs generated an increasing need to optimize substrate exploitation and operation conditions. This includes a comprehensive and reliable biogas process monitoring. For that purpose a number of different process monitoring methods like CH4 production rate, FOS/TAC (ratio of organic acid/total inorganic carbon alkalinity), pH or (auto)fluorescence are successfully applied. This paper will evaluate whether the surface charge — a parameter, which has not been in use so far — might also be suitable for biogas process monitoring. Since it is known that the surface charge is correlated with the adherence and floc formation capability of microbial cells, a change in surface charge might also reflect a change in the biogas process efficiency, or vice versa. To test this hypothesis, samples for the investigations were taken from a continuously stirred laboratory‐scale tank biogas reactor with continuously increased substrate load. The impact of the load change was measured with both, surface charge and a number of more established monitoring parameters as given above. It was found that the “surface charge” reflected well short‐term process changes (within hours) caused by an increasing substrate load in the reactor, though the highest short‐term monitoring sensitivity was obtained with the “FOS/TAC” monitoring. Different from other monitoring parameters like CH4, pH, or FOS/TAC the value of the parameter “surface charge” decreased with every feeding, eventually indicating a continuous deterioration of the biogas process conditions. Surface charge might therefore be of particular use as a complementary tool especially for the long‐term monitoring of biogas process conditions.

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Section: Discussionsupporting

confidence: 87%

Comparative evaluation of sludge surface charge as an indicator of process fluctuations in a biogas reactor

Winde

Berghoff

Schories

et al. 2018

Engineering in Life Sciences

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“…PM showed a remarkably higher VFA concentration than FW and CM (over five-fold), with acetate, propionate, and butyrate (9.3, 5.2, and 7.8 g COD/kg, respectively) as the major VFA components ( Table 1 ). A high VFA concentration can disturb the balance between acid-forming and acid-consuming reactions and thus inhibit methanogenesis [ 33 , 34 ]. PM also contained a significantly higher level of toxic free ammonia nitrogen than the other substrates (>3-fold), consistent with the literature [ 35 , 36 ].…”

Section: Resultsmentioning

confidence: 99%

Treatment of Cattle Manure by Anaerobic Co-Digestion with Food Waste and Pig Manure: Methane Yield and Synergistic Effect

Baek

Kim

et al. 2020

IJERPH

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The management of cattle manure (CM) has become increasingly challenging because its production continues to rise, while the regulations on manure management have become increasingly stringent. In Korea, most farms produce CM as a dry mixture with lignocellulosic bedding materials (mainly sawdust), making it impractical to treat CM by anaerobic digestion. To address this problem, this study examined whether anaerobic co-digestion with food waste (FW) and pig manure (PM) could be an effective approach for the treatment of CM. The batch anaerobic digestion tests at different CM: FW: PM mixing ratios showed that more methane was produced as the FW fraction increased, and as the CM fraction decreased. The response surface models describing how the substrate mixing ratio affects the methane yield and synergistic effect (methane yield basis) were successfully generated. The models proved that the methane yield and synergistic effect respond differently to changes in the substrate mixing ratio. The maximum 30-day methane yield was predicted at 100% FW, whereas the maximum 30-day synergy index was estimated for the mixture of 47% CM, 6% FW, and 47% PM (total solids basis). The synergy index model showed that CM, FW, and PM could be co-digested without a substantial loss of their methane potential at any mixing ratio (30-day synergy index, 0.89–1.22), and that a possible antagonistic effect could be avoided by keeping the FW proportion less than 50%. The results suggest that co-digestion with PM and FW could be flexibly applied for the treatment and valorization of CM in existing anaerobic digestion plants treating FW and PM.

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“…Total DNA was extracted from the microalgal culture samples using an automated nucleic acid extractor (ExiProgen, Bioneer) as previously described 24 . Denaturing gradient gel electrophoresis (DGGE) analysis was performed with the prepared DNA samples to look at the microbial community structures.…”

Section: Methodsmentioning

confidence: 99%

Nutrient removal and microalgal biomass production from different anaerobic digestion effluents with Chlorella species

Kim

Lee

2019

Sci Rep

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Potential of microalgal cultivation as an alternative approach to the treatment of anaerobic digestion (AD) effluents was examined using two representative Chlorella species, Chlorella vulgaris (CV) and Chlorella protothecoides (CP). Both species effectively removed NH 4 + -N from the AD effluents from four digesters treating different wastes under different operating conditions. In all experimental cultures on the AD effluents, NH 4 + -N (initial concentration, 40 mg/L) was completely removed within 10 days without residual NO 3 − -N or NO 2 − -N in batch mode. Compared to CP, CV showed greater biomass and lipid yields (advantageous for biodiesel production), regardless of the media used. Prolonged nitrogen starvation significantly increased the lipid accumulation in all cultures on the AD effluents, and the effect was more pronounced in the CV than in the CP cultures. On the other hand, compared to CV, CP showed significantly faster settling (advantageous for biomass harvesting) in all media. Our results suggest that the Chlorella cultivation on AD effluents under non-sterile, mixed-culture conditions may provide a viable way to manage and valorize the problematic effluents. Diverse bacteria derived from the AD effluents co-existed and presumably interacted with the Chlorella species in the cultures.

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Response of a continuous biomethanation process to transient organic shock loads under controlled and uncontrolled pH conditions

Cited by 37 publications

References 30 publications

Comparative evaluation of sludge surface charge as an indicator of process fluctuations in a biogas reactor

Comparative evaluation of sludge surface charge as an indicator of process fluctuations in a biogas reactor

Treatment of Cattle Manure by Anaerobic Co-Digestion with Food Waste and Pig Manure: Methane Yield and Synergistic Effect

Nutrient removal and microalgal biomass production from different anaerobic digestion effluents with Chlorella species

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