Effect of feed to inoculum ratios on biogas yields of food and green wastes

Liu, Guangqing; Zhang, Ruihong; El‐Mashad, Hamed M.; Dong, Renjie

doi:10.1016/j.biortech.2009.03.081

Cited by 222 publications

(105 citation statements)

References 16 publications

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“…Fairly similar final biogas yields were found at F/Ms of 2.0 and 3.2 but biogas yield was decreased by 16% at F/M ratio of 4.9. Liu, et al (2009) reported similar biogas yield for F/M ratio between 1.6 to 4.0 but the biogas yield was greatly reduced when the F/M ratio increased to 5.0. The methane yield was almost constant at F/M ratio of 2.0 and 3.2 but it decreased by 11% when F/M ratio increased from 3.2 to 4.9 during 30 days digestion time (Table 4).…”

Section: Effect Of F/m Ratio On Gas Yield From Mixture Of Ccwj and Smmentioning

confidence: 85%

Anaerobic Digestion Treatment for the Mixture of Chinese Cabbage Waste Juice and Swine Manure

Kafle¹,

Kim²,

Shin³

2012

Journal of Biosystems Engineering

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Purpose:The objective of this study was to investigate the feasibility of anaerobic digestion of Chinese cabbage waste juice (CCWJ) and swine manure(SM). Methods: The anaerobic digestion test was conducted under batch and continuous conditions at mesophilic temperature (36-38℃). The batch test was divided into Experiment I and II. In the Experiment I, biogas potential and production rate of CCWJ was evaluated. In Experiment II the effect of F/M ratio (2.0, 3.2, 4.9) at mixture ratio of 25:75(CCWJ: SM, % vol. basis) on biogas yield was studied. Results: CCWJ produced biogas and methane yield of 929 and 700 mL/g VS added respectively. The biogas yield from the mixture of CCWJ and SM was almost same at F/M ratio of 2.0 and 3.2 but dropped by 14% when F/M ratio increased from 3.2 to 4.9. In continuous test the mixture of CCWJ and SM (25:75, % vol. basis) produced biogas yield of 352 mL/g VS added which is around 11% higher compared to biogas yield from SM alone. Addition to biogas yield digester performance was also improved with co-digestion of CCWJ with SM. Conclusions:The results showed that the anaerobic digestion of CCWJ with SM could be promising for improving both the biogas yield and digester performance at mesophilic temperature.

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Section: Effect Of F/m Ratio On Gas Yield From Mixture Of Ccwj and Smmentioning

confidence: 85%

Anaerobic Digestion Treatment for the Mixture of Chinese Cabbage Waste Juice and Swine Manure

Kafle¹,

Kim²,

Shin³

2012

Journal of Biosystems Engineering

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“…This inverse relation might be due to the low methanogenic activity and/or number of methogens in the digesters, which produce excess VFA during the acidogenic step. High concentrations of VFA could inhibit methanogenesis (Liu et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…In experiments that examined the mixture of food waste and swine manure (R7-R12), each digester contained the same amount of inoculum (20 mL). The F/I ratio of the reactor was expressed as the amount of feedstock (food waste) VS per amount of inoculum VS (Liu et al, 2009). The experimental design is shown in Table 2.…”

Section: Batch Digester and Experimental Proceduresmentioning

confidence: 99%

Methane Production Potential of Food Waste and Food Waste Mixture with Swine Manure in Anaerobic Digestion

Islam¹,

Park²,

Yoon³

2012

Journal of Biosystems Engineering

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Purpose: Methane production potential in aerobic digestion was assessed according to feed to inoculum (F/I) ratio for food waste only, and mixing ratio of two materials for food waste and swine manure to give a basic data for the design of anaerobic digestion system. Methods: Anaerbic digestion test was performed using a lab scale batch reactor at 35 o C for six different feed to inoculum (F/I) ratios (0.50, 0.72, 1.14, 1.50, 2.14 and 3.41), three food waste to swine manure ratios (100:0, 60:40 and 40:60) with two different loading concentrations (10g VS/L and 30g VS/L). Results: For food waste only, the highest biogas yield of 1008 mL/gVS was obtained at 0.50 of F/I. For the co-digestion of food waste and swine manure mixture, the highest biogas yield of 1148 mL/gVS was obtained at a mixing ratio of 40:60 with loading concentration of 10g VS/L. Conclusions: F/I ratio for the food waste only, mixing ratio of food waste and swine manure, and co-substrate loading rate affected the biogas production rate. For the low loading rate, there was not so much difference according to the mixing ratio of food waste and swine manure, but for the high loading rate higher biogas yield was acquired for the co-digestion of food waste and swine manure than for the food waste alone (mixing ratio, 100:0).

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“…[19] which conducts research biogas production from raw materials corncob yielding the largest biogas in the ratio F/I 2.43 and TS content of 22%. [21] Research with the raw materials of food waste and grass with SS-AD method. [13] Research on biogas with rice straw raw materials have also been carried out, which aims to determine the effect of type of inoculum to the production of biogas, but in these studies using meode L-AD and did not evaluate the effect of the ratio F/I, TS content and physical pretreatment effect on the production of biogas.…”

Section: Introductionmentioning

confidence: 99%

The effect of enzymatic pretreatment and c/n ratio to biogas production from rice husk waste during solid state anaerobic digestion (SS-AD)

Nugraha

Matin

2017

MATEC Web Conf.

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Abstract. Rice husk is one of agricultural waste generated from the mill is potential to be converted to biogas. Otherwise, biogas production facing problem due to the high lignin content. This research is objected to study the effect of enzymatic pretreatment and C/N ratio to biogas production from rice husk by solid state anaerobic digestion (SS-AD). The laboratory scale-anaerobic digestions was used in this work. It is operated in batch system and with room temperature. Total solid (TS) was set 21%. Enzymatic pretreatment was conducted using lignase enzyme. Carbon to Nitrogen (C/N) ratio was varied from 20, 25, 30, and 35. The C/N ratio is varied by adding some quantity of technical urea to the substrate. Biogas formed was measured using water displacement method in every two days. The result showed that enzymatic pretreatment could increase biogas production from 30 to 55 %. The highest biogas production was obtained at C/N ratio 35. Specific biogas production on C/N ratio of 20, 25, 30, and 35 were respectively 12.0, 12.6, 13.5 and 18.2 ml/gr TS. The volumetric loading resulted by SS-AD was higher than liquid anaerobic digestion (L-AD). The further research need to conduct for optimization the enzyme concentration and C/N ratio.

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Effect of feed to inoculum ratios on biogas yields of food and green wastes

Cited by 222 publications

References 16 publications

Anaerobic Digestion Treatment for the Mixture of Chinese Cabbage Waste Juice and Swine Manure

Anaerobic Digestion Treatment for the Mixture of Chinese Cabbage Waste Juice and Swine Manure

Methane Production Potential of Food Waste and Food Waste Mixture with Swine Manure in Anaerobic Digestion

The effect of enzymatic pretreatment and c/n ratio to biogas production from rice husk waste during solid state anaerobic digestion (SS-AD)

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