Enhancing anaerobic digestion of food waste through biochemical methane potential assays at different substrate: inoculum ratios

Hobbs, Shakira R.; Landis, Amy E.; Rittmann, Bruce E.; Young, Michelle N.; Parameswaran, Prathap

doi:10.1016/j.wasman.2017.06.029

Cited by 112 publications

(47 citation statements)

References 19 publications

(21 reference statements)

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“…Anaerobic co-digestion (coAD) is an effective way to improve biogas production, due to low capital investment and substantial environmental benefits [10]. Suitable co-substrates are beneficial for FW digestion, because co-substrates can supply micronutrients and alkalinity, dilute toxic chemicals, enhance the synergistic effect of microorganisms, and overcome the disadvantages of FW mono-digestion [11][12][13]. Thus, the optimization of substrate properties of coAD is an important way to improve digestion efficiency and the process performance of FW.…”

Section: Introductionmentioning

confidence: 99%

Chemically Enhanced Primary Sludge as an Anaerobic Co-Digestion Additive for Biogas Production from Food Waste

Kang¹,

Liu²

2019

Processes

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In order to overcome process instability and buffer deficiency in the anaerobic digestion of mono food waste (FW), chemically enhanced primary sludge (CEPS) was selected as a co-substrate for FW treatment. In this study, batch tests were conducted to study the effects of CEPS/FW ratios on anaerobic co-digestion (coAD) performances. Both soluble chemical oxygen demand (SCOD) and protease activity were decreased, with the CEPS/FW mass ratio increasing from 0:5 to 5:0. However, it was also found that the accumulation of volatile fatty acids (VFAs) was eliminated by increasing the CEPS/FW ratio, and that corresponding VFAs concentrations decreased from 13,872.97 to 1789.98 mg chemical oxygen demand per L (mg COD/L). In addition, the maximum value of cumulative biogas yield (446.39 mL per g volatile solids removal (mL/g VSs removal )) was observed at a CEPS/FW ratio of 4:1, and that the tendency of coenzyme F420 activity was similar to biogas production. The mechanism analysis indicated that Fe-based CEPS relived the VFAs accumulation caused by FW, and Fe(III) induced by Fe-based CEPS enhanced the activity of F420. Therefore, the addition of Fe-based CEPS provided an alternative method for FW treatment.Chemically enhanced primary sedimentation (CEPS) is produced during the chemically enhanced primary treatment process of wastewater treatment plants (WWTPs) using an Fe/Al-based coagulant addition that contains a large amount of polymeric sludge rich in Fe/Al. As described by Lin [14], ferric chloride (FeCl 3 ) (10-12 mg Fe/L of dosage) was used to enhance the primary wastewater treatment of the Stonecutters Island Sewage Treatment Works in Hong Kong, and a large number of Fe-based CEPS sludge was produced. Fe is an essential trace metal for anaerobic microorganisms that participates in the synthesis of some important metalloenzymes in methanogenesis [15]. It has been demonstrated that addition of ferric chloride could disinhibit excessive volatile fatty acids [16] and enhance biogas production by enriching Coprothermobacter for protein fermentation and Methanosarcina for methanogenesis from the perspective of microorganisms [17]. It has been proposed that the introduction of FeCl 3 might contribute to a reduction of VFAs content and protect methanogenesis from the accumulation of volatile acids. Thus, the effects of Fe-based CEPS on VFAs reduction and methanogenesis during the coAD of FW need to be studied deeply.This study intends to explore coAD performance of FW and Fe-based CEPS from the perspective of organic matter degradation, while simultaneously investigating the relationship between biogas production and Fe-based CEPS content under mesophilic digestion. Different mixing ratios of the CEPS and FW were conducted to study the typical substances involved in the coAD process, including organic substrate solubilization, VFAs variation, and biogas production. Meanwhile, representative enzyme activities associated with AD were monitored to analyze process stability of biogas production. Materials and Methods Substrat...

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Section: Introductionmentioning

confidence: 99%

Chemically Enhanced Primary Sludge as an Anaerobic Co-Digestion Additive for Biogas Production from Food Waste

Kang¹,

Liu²

2019

Processes

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“…Moreover, high concentrations of trace elements of Ni (35.2 mg/kg) and Mo (15.4 mg/kg) in the inoculum improved methane yield (140.7 mL CH 4 · gVS -1 ) and hydrolysis constant (>0.18d -1 ) and presented short lag-phase (<1day) in the AD [10]. Feed/inoculum (F/I) ratio as the predominant factor affecting AD was set tests by Li et al [11] And Hobbs et al [12]. Li et al performed batch tests to estimate the effects of waste cooking oil content (33-53%) and feed/inoculum (F/I) ratios (0.5-1.2) on biogas/methane yield.…”

Section: Parameters Optimizationmentioning

confidence: 99%

“…The optimum EE/VS and F/I ratios for the AD of FW are 43% and 0.70. Hobbs et al [12] used Anaerobic digester sludge (ADS) as the inoculum and obtained the highest CH 4 -COD recovery at the 1.42 ratio: 90% of the initial TCOD from FW followed by ratios 0.42 and 3.0 at 69% and 57%, giving the best balance of high methane yield with a short lag time [12].…”

Section: Parameters Optimizationmentioning

confidence: 99%

Latest research progress on food waste management: a comprehensive review

Zhu

Gao

Duan

2018

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract.Since a large amount of food supplying is provided as a basic line measuring increasing residents' life standard, food waste has become progressively numeral considerable. Much attention has been drawn to this problem. This work gave an overview on latest researches about anaerobic digestion, composting, generalized management and other developments on management of food waste. Different technologies were introduced and evaluated. Further views on future research in such a field were proposed. IntroductionFood waste (FW) is composed of household food waste, food-processing waste, canteen and restaurant waste, which is one of the components of municipal solid waste [1]. The accumulation of FW cannot be neglected because of tremendous environmental and sanitary problems with it. FW amount is estimated to quickly increase from 2.78 billion tons to 4.16 billion tons in Asian countries by 2025[1]. About 1.3billion tons of food, fully one-third of all food produced is lost along the food supply chain every year [7]. While economy is still accelerated, FW grows larger at the same time. However, it is significant to see that FW management also takes an important role in the renewable energy and sustainable development for values like Biomethane potential(BMP) of FW. With rising attention being moved on this field, technologies developments for this have been made continually.Anaerobic digestion (AD) has always been the hot research trend for its relatively costeffectiveness, renewable energy production and waste treatment of high-moisture and energy-rich material [2]. During AD process, biomass and organic fraction of municipal solid waste (OFMSW) can be converted into combustible biogas (mainly methane, and other gases like hydrogen and hydrogen sulfide) [2]. Parameters such as methane yield and volatile solids reduction or so were used to assess experiment performance. In order to enhance methane generation performance, various aspects of AD were researched. Additive supplementation, operational alternations, parameters optimization and microbial actions have been discussed by researchers. In addition to AD, composting, co-pyrolysis and other FW managements pathways also have been conducted to research results. At the same time, investigations and sorting systems were made for governments to implement better decisions on FW management. This paper aims to critically give an overview on latest research progress and novel developments of FW management in 2018. Further views on future research needs in such a field were proposed simultaneously.

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“…This inoculum is frequently sourced from anaerobic digesters that are actively producing biomethane, hence it consists of microorganisms that have adapted to the AD environment. 14,15 Numerous studies have been conducted on the influence of substrate/inoculum ratio [16][17][18] and inoculum source on biogas yield. 17,[19][20][21] However the availability of an inoculum for the AD process is not always ascertained.…”

Section: Introductionmentioning

confidence: 99%

New insights into the metagenomic link between pre‐treatment method, addition of an inoculum and biomethane yield during anaerobic digestion of water hyacinth (Eichhornia crassipes)

Roopnarain

Nkuna

Ndaba

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Water hyacinth (Eichhornia crassipes) is a fast growing water weed that threatens the aquatic ecosystem and human activities, hence control of the plant is essential. One such control approach is to harvest and utilize hyacinth as a substrate for anaerobic digestion (AD). Various factors influence AD performance, including substrate pre‐treatment and microbial community composition, amongst others. This study was aimed at establishing the link between method of substrate pre‐treatment, microbial diversity, inoculum addition and biogas yield during AD of hyacinth. RESULTS The addition of an inoculum resulted in microbial community stability and early biomethane production of up to 0.4 L irrespective of pre‐treatment method. However, cultures that lacked inoculum showed distinct microbial community structure variation in response to pre‐treatment method, and minimal early biomethane production (up to 0.1 L). Biogas produced by cultures lacking inoculum was initially mostly composed of carbon dioxide (up to 100% of total biogas), but as digestion proceeded, an increase in biomethane production was observed (up to 60% of total biogas), which correlated with the shift in microbial community structure and increased microbial diversity. This indicates the presence of biogas‐producing microorganisms associated with the collected hyacinth. Canonical correspondence analysis proved that dynamic changes in microbial community structure and biogas yield were strongly correlative. CONCLUSION This study proves that hyacinth pre‐treatment influences microbial community structure and concomitant biogas yield in the absence of an inoculum. The addition of an inoculum aids in stability of microbial community structure and biogas yield irrespective of method of hyacinth pre‐treatment. © 2019 Society of Chemical Industry

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Enhancing anaerobic digestion of food waste through biochemical methane potential assays at different substrate: inoculum ratios

Cited by 112 publications

References 19 publications

Chemically Enhanced Primary Sludge as an Anaerobic Co-Digestion Additive for Biogas Production from Food Waste

Chemically Enhanced Primary Sludge as an Anaerobic Co-Digestion Additive for Biogas Production from Food Waste

Latest research progress on food waste management: a comprehensive review

New insights into the metagenomic link between pre‐treatment method, addition of an inoculum and biomethane yield during anaerobic digestion of water hyacinth (Eichhornia crassipes)

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