Use of biogas biscuit meal EKPO-EB for agricultural biogas plant for substitution of energy crops utilization with organic waste

Abstract A laboratory experiment of two-stage mesophilic, low-dry mass, anaerobic digestion was carried out, focused on verifying the benefit of processing the biscuit meal EKPO-EB instead of triticale silage Agostino (GPS) and corn silage LG3266 in a regular batch for the agricultural biogas station in Pustějov. While anaerobic digestion of ensilages is largely difficult due to the content of lignocellulose, biscuit meal provides a high yield of biogas or methane, respectively, thanks to its high content of simple saccharides and lipids. When the original GPS (or the replacement EKPO-EB, respectively) represented 0.81% of weight of the daily input mixture dose for the first stage, the rise in volumetric methane production was 20% which is significant. The biscuit meal EKPO-EB decomposes almost completely in the first stage. Later, when the EKPO-EB represented 1.63% of weight of the daily input mixture dose for the first stage, the rise in volumetric methane production was 54% in the first stage and 16% in the second stage.

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Nutrient and heavy metal accumulation in municipal organic waste from separate collection during anaerobic digestion in a two-stage laboratory biogas plant

Bioresource Technology ◽

10.1016/j.biortech.2017.05.026 ◽

2017 ◽

Vol 239 ◽

pp. 437-446 ◽

Cited By ~ 10

Author(s):

Christine Knoop ◽

Christina Dornack ◽

Thomas Raab

Keyword(s):

Heavy Metal ◽

Anaerobic Digestion ◽

Organic Waste ◽

Metal Accumulation ◽

Heavy Metal Accumulation ◽

Biogas Plant ◽

Two Stage

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Treatment of corn ethanol distillery wastewater using two-stage anaerobic digestion

Water Science & Technology ◽

10.2166/wst.2016.185 ◽

2016 ◽

Vol 74 (2) ◽

pp. 431-437 ◽

Cited By ~ 6

Author(s):

B. Ráduly ◽

L. Gyenge ◽

Sz. Szilveszter ◽

A. Kedves ◽

S. Crognale

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Oxygen Demand ◽

Continuous Phase ◽

Methane Content ◽

Microbial Consortia ◽

Two Stage ◽

Second Stage ◽

Conversion Rates ◽

Distillery Wastewater

In this study the mesophilic two-stage anaerobic digestion (AD) of corn bioethanol distillery wastewater is investigated in laboratory-scale reactors. Two-stage AD technology separates the different sub-processes of the AD in two distinct reactors, enabling the use of optimal conditions for the different microbial consortia involved in the different process phases, and thus allowing for higher applicable organic loading rates (OLRs), shorter hydraulic retention times (HRTs) and better conversion rates of the organic matter, as well as higher methane content of the produced biogas. In our experiments the reactors have been operated in semi-continuous phase-separated mode. A specific methane production of 1,092 mL/(L·d) has been reached at an OLR of 6.5 g TCOD/(L·d) (TCOD: total chemical oxygen demand) and a total HRT of 21 days (5.7 days in the first-stage, and 15.3 days in the second-stage reactor). Nonetheless the methane concentration in the second-stage reactor was very high (78.9%); the two-stage AD outperformed the reference single-stage AD (conducted at the same reactor loading rate and retention time) by only a small margin in terms of volumetric methane production rate. This makes questionable whether the higher methane content of the biogas counterbalances the added complexity of the two-stage digestion.

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Biochar promotes methane production during anaerobic digestion of organic waste

Environmental Chemistry Letters ◽

10.1007/s10311-021-01251-6 ◽

2021 ◽

Author(s):

Leilei Xiao ◽

Eric Lichtfouse ◽

P. Senthil Kumar ◽

Quan Wang ◽

Fanghua Liu

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Organic Waste

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Two-stage alkaline and acid pretreatment applied to sugarcane bagasse to enrich the cellulosic fraction and improve enzymatic digestibility

Detritus ◽

10.31025/2611-4135/2020.14005 ◽

2020 ◽

pp. 106-113

Author(s):

Longinus Ifeanyi Igbojionu ◽

Cecilia Laluce ◽

Edison Pecoraro

Keyword(s):

Sugarcane Bagasse ◽

Maleic Acid ◽

Ethanol Yield ◽

High Yield ◽

Enzymatic Digestibility ◽

Acid Pretreatment ◽

Two Stage ◽

Second Stage ◽

One Stage ◽

Naoh Pretreatment

Sugarcane bagasse (SB) is made up of cellulose (32-43%), hemicellulose (19-34%) and lignin (14-30%). Due to high recalcitrant nature of SB, pretreatment is required to deconstruct its structure and enrich the cellulosic fraction. A two-stage NaOH and maleic acid pretreatment was applied to SB to enrich its cellulosic fraction. SB used in the present study is composed of cellulose (40.4 wt%), hemicellulose (20.9 wt%), lignin (22.5 wt%) and ash (4.0 wt%). After one-stage NaOH pretreatment, its cellulosic fraction increased to 61.8 wt% and later increased to 80.1 wt% after the second-stage acid pretreatment. Lignin fraction decreased to 3.0 wt% after one-stage NaOH pretreatment and remained unaffected after the acid pretreatment step. Hemicellulose fraction decreased substantially after the second-stage pretreatment with maleic acid. Pretreated SB displayed high crystallinity index and improved enzymatic digestibility. Hydrolysates of pretreated SB contained very low amount of xylose and subsequent fermentation by Saccharomyces cerevisiae -IQAr/45-1 resulted to ethanol level of 8.94 g/L. Maximal ethanol yield of 0.49 g/g (95.8% of theoretical yield) and productivity of 0.28 g/L/h was attained. At the same time, biomass yield and productivity of 0.47 g/g and 0.27 g/L/h respectively were obtained. Two-stage NaOH and maleic acid pretreatment led to ~ two-fold increase in cellulosic fraction and enhanced the enzymatic digestibility of SB up to 70.4%. The resulted enzymatic hydrolysate was efficiently utilized by S. cerevisiae -IQAr/45-1 to produce high yield of ethanol. Thus, optimization of enzymatic hydrolysis at low enzyme loading is expected to further improve the process and reduce cost.

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