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Sonakya, V.; Raizada, Neena; Kalia, Vipin Chandra

doi:10.1023/a:1011664912970

Cited by 65 publications

(12 citation statements)

References 7 publications

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“…3 The discharge of greenhouse gases (GHGs) into the atmosphere is expected to have signicant impact on the environment, human health and the economy. 7,8 The operating cost of treatment of highorganic industrial wastewater is less by anaerobic digestion than by aerobic composting. 4 The pre-consumer organic waste can be used to produce garbage enzymes by fermentation.…”

Section: Introductionmentioning

confidence: 99%

Solubilization of waste activated sludge using a garbage enzyme produced from different pre-consumer organic waste

Arun

Sivashanmugam

2015

RSC Adv.

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The conversion of pre-consumer solid waste into value added products, and utilisation of this for the treatment of activated sludge into a reusable form without having toxic effects on the environment, is much more in focus in the present day. In the present work, different types of garbage enzyme were produced from preconsumer waste (pineapple, cauliflower, orange, tomato, and mango dregs) and the characteristics of each garbage enzyme produced were investigated. Sludge solubilization was performed with different types of garbage enzyme at different pH and time. When the treatment time increased from 48-60 hours, a higher reduction of VSS (Volatile Suspended Solids), TSS (Total Suspended Solids) and also a higher increase of the solubility of COD (Chemical Oxygen Demand), TKN (Total Kjeldhal Nitrogen) and TP (Total Phosphorus) were obtained for all types of garbage enzyme at pH 7. The pineapple and orange garbage enzyme showed a higher reduction % of VSS and TSS of nearly 20-25% and also increased % solubilization of COD, TKN and TP by nearly 20-25%, 15-20% and 9-11% respectively in treated WAS (Waste Activated Sludge) compared with other garbage enzymes. This significant result showed that a garbage enzyme solution has the capability to solubilize complex (insoluble organic) compounds to soluble organic compounds, which can be subsequently treated by anaerobic microbes to produce methane or hydrogen.

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Section: Introductionmentioning

confidence: 99%

Solubilization of waste activated sludge using a garbage enzyme produced from different pre-consumer organic waste

Arun

Sivashanmugam

2015

RSC Adv.

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“…And such bacteria are present in small numbers in natural populations. The other issue is the fact that H 2 produced by one set of bacteria is immediately quenched by methanogens, such that there is little or no net evolution of H 2 [15]. In the present study, bacteria with high relative enzyme efficiencies were mixed in equal proportions.…”

Section: Discussionmentioning

confidence: 94%

“…Sterilization of biowaste to get rid of contaminating bacteria is a costly proposal. Attempts to produce H 2 from un-sterile wastes have been successful to some extent [6,[15][16][17]. The need is to look for a robust set of organisms, which can survive under harsh conditions and produce H 2 and CH 4 .…”

Section: Introductionmentioning

confidence: 99%

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Ecobiotechnological Strategy to Enhance Efficiency of Bioconversion of Wastes into Hydrogen and Methane

et al. 2014

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Vegetable wastes (VW) and food wastes (FW) are generated in large quantities by municipal markets, restaurants and hotels. Waste slurries (250 ml) in 300 ml BOD bottles, containing 3, 5 and 7 % total solids (TS) were hydrolyzed with bacterial mixtures composed of: Bacillus, Acinetobacter, Exiguobacterium, Pseudomonas, Stenotrophomonas and Sphingobacterium species. Each of these bacteria had high activities for the hydrolytic enzymes: amylase, protease and lipase. Hydrolysate of biowaste slurries were subjected to defined mixture of H 2 producers and culture enriched for methanogens. The impact of hydrolysis of VW and FW was observed as 2.6-and 2.8-fold enhancement in H 2 yield, respectively. Direct biomethanation of hydrolysates of VW and FW resulted in 3.0-and 1.15-fold improvement in CH 4 yield, respectively. A positive effect of hydrolysis was also observed with biomethanation of effluent of H 2 production stage, to the extent of 1.2-and 3.5-fold with FW and VW, respectively. The effective H 2 yields were 17 and 85 l/kg TS fed, whereas effective CH 4 yields were 61.7 and 63.3 l/kg TS fed, from VW and FW, respectively. This ecobiotechnological strategy can help to improve the conversion efficiency of biowastes to biofuels.

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“…The same positive effect of enzymes on methane yields was also found in our previous work with hydrothermally pretreated spruce [52], and in some other studies in the literature. For example, Sonakya et al [53] used wheat grain and treated it with Tizyme Trizyme? (a mixture of cellulase, α-amylase, and protease) prior the anaerobic digestion, which improved the methane yield by 7%-14%.…”

Section: Effect Of Pretreatment Time On Methane Yieldmentioning

confidence: 99%

High-Titer Methane from Organosolv-Pretreated Spruce and Birch

et al. 2017

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Abstract:The negative impact of fossil fuels and the increased demand for renewable energy sources has led to the use of novel raw material sources. Lignocellulosic biomass could serve as a possible raw material for anaerobic digestion and production of biogas. This work is aimed at using forest biomass, both softwood (spruce) and hardwood (birch), as a raw material for anaerobic digestion. We examined the effect of different operational conditions for the organosolv pretreatment (ethanol content, duration of treatment, and addition of acid catalyst) on the methane yield. In addition, we investigated the effect of addition of cellulolytic enzymes during the digestion. We found that inclusion of an acid catalyst during organosolv pretreatment improved the yields from spruce, but it did not affect the yields from birch. Shorter duration of treatment was advantageous with both materials. Methane yields from spruce were higher with lower ethanol content whereas higher ethanol content was more beneficial for birch. The highest yields obtained were 185 mL CH 4 /g VS from spruce and 259.9 mL CH 4 /g VS from birch. Addition of cellulolytic enzymes improved these yields to 266.6 mL CH 4 /g VS and 284.2 mL CH 4 /g VS, respectively.

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Cited by 65 publications

References 7 publications

Solubilization of waste activated sludge using a garbage enzyme produced from different pre-consumer organic waste

Solubilization of waste activated sludge using a garbage enzyme produced from different pre-consumer organic waste

Ecobiotechnological Strategy to Enhance Efficiency of Bioconversion of Wastes into Hydrogen and Methane

High-Titer Methane from Organosolv-Pretreated Spruce and Birch

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