Anaerobic Co-Digestion of Waste Wafers from Confectionery Production with Sewage Sludge

Pilarska, Agnieszka A.

doi:10.15244/pjoes/70897

Cited by 21 publications

(42 citation statements)

References 29 publications

(36 reference statements)

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“…The efficiency of anaerobic digestion of CE is also comparable with that of food waste from restaurants and canteens [57]. The efficiency of biogas production from confectionery waste or stuffed wafers alone was verified and discussed in detail in earlier publications by Pilarska et al (2018 [14,15]. The co-substrate system with waste wafers and waste cheese was tested for the first time.…”

Section: Bacterial Count and Enzymatic Activitymentioning

confidence: 83%

“…There is a good prognosis for the implementation of this solution in industrial production. The analysis and comparison of the earlier results show that dairy waste proved to be a better co-substrate for waste wafers than sewage sludge [14,25]. and α-amylase immobilization [54].…”

Section: Bacterial Count and Enzymatic Activitymentioning

confidence: 89%

“…They were filled with the batch up to 1 L, which was mixed once a day. The bioreactors were located in a water jacket (4) connected to a heater (1), thanks to which the process could be conducted within the set temperature range (mesophilic conditions) [14,34]. The biogas produced in the process flowed (7) to the tanks (8) freely, where it was stored.…”

Section: Anaerobic Digester Setupmentioning

confidence: 99%

“…The physicochemical properties of waste wafers (WF) and digested sewage sludge (inoculum) were characterized in detail by the first author in earlier publications [14,15,25,26]. Generally, WF are characterized by approximately neutral pH, considerable content of total solids (TS) and volatile solids (VS), and a high C/N ratio (see Table 1), which contributes to their high biochemical methane potential (BMP) [15].…”

Section: Physicochemical Properties Of Substratesmentioning

confidence: 99%

“…The concentration of ammonium nitrogen (N-NH 4 + ) and light metals does not exceed the critical values [39] for the stability of anaerobic digestion (AD). On the contrary, it favors the development and activity of methanogenic consortia [14,26]. The main advantage of stabilized sewage sludge is its high buffer capacity due to its considerable alkalinity developed in the raw sewage sludge digestion process, where nitrates were reduced to carbonates and hydrogencarbonates (total denitrification) [43].…”

Section: Physicochemical Properties Of Substratesmentioning

confidence: 99%

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The Use of Lignin as a Microbial Carrier in the Co-Digestion of Cheese and Wafer Waste

et al. 2019

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The aim of the article was to present the effects of lignin grafted with polyvinylpyrrolidone (PVP) as a microbial carrier in anaerobic co-digestion (AcoD) of cheese (CE) and wafer waste (WF). Individual samples of waste cheese and wafers were also tested. The PVP modifier was used to improve the adhesive properties of the carrier surface. Lignin is a natural biopolymer which exhibits all the properties of a good carrier, including nontoxicity, biocompatibility, porosity, and thermal stability. Moreover, the analysis of the zeta potential of lignin and lignin combined with PVP showed their high electrokinetic stability within a wide pH range, that is, 4-11. The AcoD process was conducted under mesophilic conditions in a laboratory by means of anaerobic batch reactors. Monitoring with two standard parameters: pH and the VFA/TA ratio (volatile fatty acids-to-total alkalinity ratio) proved that the process was stable in all the samples tested. The high share of N-NH 4 + in TKN (total Kjeldahl nitrogen), which exceeded 90% for WF+CE and CE at the last phases of the process, proved the effective conversion of nitrogen forms. The microbiological analyses showed that eubacteria proliferated intensively and the dehydrogenase activity increased in the samples containing the carrier, especially in the system with two co-substrates (WF+CE/lignin) and in the waste cheese sample (CE/lignin). The biogas production increased from 1102.00 m 3 Mg −1 VS (volatile solids) to 1257.38 m 3 Mg −1 VS in the WF+CE/lignin sample, and from 881.26 m 3 Mg −1 VS to 989.65 m 3 Mg −1 VS in the CE/lignin sample. The research results showed that the cell immobilization on lignin had very positive effect on the anaerobic digestion process.

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Section: Bacterial Count and Enzymatic Activitymentioning

confidence: 83%

Section: Bacterial Count and Enzymatic Activitymentioning

confidence: 89%

Section: Anaerobic Digester Setupmentioning

confidence: 99%

Section: Physicochemical Properties Of Substratesmentioning

confidence: 99%

Section: Physicochemical Properties Of Substratesmentioning

confidence: 99%

See 3 more Smart Citations

The Use of Lignin as a Microbial Carrier in the Co-Digestion of Cheese and Wafer Waste

et al. 2019

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2-biofuels (H2 and CH4) production from anaerobic digestion of biscuits wastewater: Experimental study and techno-economic analysis

Tawfik

Ali

Danial

et al. 2021

Journal of Water Process Engineering

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Determining the thickness of sludge on the heat exchanger tube inside an anaerobic digester

Hożejowski

Teleszewski

2019

EPJ Web Conf.

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The paper presents a simplified method of determining the thickness of sludge on the walls of the heat exchanger piping in a biogas plant digester. The evaluation of the thickness of a sludge layer is based on the biogas plant operation parameters, including the inlet and outlet temperature of the heat exchanger, mass flow and the geometric characteristics of the heat exchanger and physical parameters of the substrate working inside a fermentation chamber. Measurement of the thickness of the sludge layer on the walls of a heat exchanger is only possible at the time of general cleaning of a digester, which necessitates switching off the biogas plant operation. The paper compares the results of predictions with experimental data of the work of a biogas plant digester located in north-eastern Poland, in Ryboły. The presentation of the obtained numerical results is supplemented by the uncertainty analysis. The significance of undertaking such research lies in its applicational aspects, as during the operation of a biogas plant sludge accumulates on the walls of a digester, which provides additional thermal resistance and reduces the thermal efficiency of the heat exchanger.

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Anaerobic Co-Digestion of Waste Wafers from Confectionery Production with Sewage Sludge

Cited by 21 publications

References 29 publications

The Use of Lignin as a Microbial Carrier in the Co-Digestion of Cheese and Wafer Waste

The Use of Lignin as a Microbial Carrier in the Co-Digestion of Cheese and Wafer Waste

2-biofuels (H2 and CH4) production from anaerobic digestion of biscuits wastewater: Experimental study and techno-economic analysis

Determining the thickness of sludge on the heat exchanger tube inside an anaerobic digester

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