Treatment of dairy waste by anaerobic co-digestion with sewage sludge

Pilarska, Agnieszka A.; Pilarski, Krzysztof; Witaszek, Kamil; Waliszewska, Hanna; Zborowska, Magdalena; Waliszewska, Bogusława; Kolasiński, Marek; Szwarc-Rzepka, Karolina

doi:10.1515/eces-2016-0007

Cited by 23 publications

(54 citation statements)

References 33 publications

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“…The propionic acid maintained at the level of 2-6 % in all bioreactors, apart from pH 6 where it shared approximately 10 % of the total volatile fatty acids. This acid, in the acidogenic phase, is decomposed into CH 3 COOH, CO 2 and H 2 [28]. Caproic acid in the samples with the pH unregulated, pH 7 and 8 were practically undetectable (< 1 %) but at pH 6 represented more than 7 %.…”

Section: Resultsmentioning

confidence: 97%

Effect of pH on the Production of Volatile Fatty Acids in Dark Fermentation Process of Organic Waste

Grzelak

Ślężak

Krzystek

et al. 2018

Ecological Chemistry and Engineering S

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The aim of this study was to investigate the effect of pH on the dark fermentation process of kitchen waste by specifying the composition of the volatile fatty acids (VFA), H2 and by drawing the carbon balance. Studies were carried out in 8 dm 3 batch bioreactor in mesophilic conditions. The kitchen waste from the city of Lodz were used as a substrate. Based on the study, it was observed that most of the VFA was produced during the first two days of the process, while in the following days the production was diminished. The highest production of VFA (19.5 g/dm 3 ) was obtained in the bioreactor, where the pH was 7 and 8. Analyzing the produced VFA it was observed that mostly the acetic and butyric acid had been produced. Most of acetic acid (over 70 %) was obtained in fermenter with pH 7 and 8. In contrast, most of the butyric acid (over 40 %) was in the bioreactor with a pH of 6. Production of H2 was in the range from 4.29 to 26.5 dm 3 , wherein the largest amount of H2 was created in the bioreactor with a pH of 6.

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Section: Resultsmentioning

confidence: 97%

Effect of pH on the Production of Volatile Fatty Acids in Dark Fermentation Process of Organic Waste

Grzelak

Ślężak

Krzystek

et al. 2018

Ecological Chemistry and Engineering S

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“…Their composition is different from that of amino acids because most proteins have other types of molecules attached to the amino acid radicals -typically sugars or organic compounds. To simplify the chemical reactions (Eqs (11)- (14)) illustrating the degradation of the complex compound, the present authors used the form: n-protein-C-NH 2 SP (Pilarska et al, 2016).…”

Section: Resultsmentioning

confidence: 99%

“…Hydrolysis leads to the degradation of the biopolymer to amino acids (C x H y O z N a S b ) and phosphate radicals P (11) (Clayden et al, 2001;Pilarska et al, 2016). In the acidogenic phase, the amino acids decompose to form less complex organic compounds -as in the degradation of the biopolymers described before (carbohydrates and fat), as well as NH 3 and H 2 S (Eq.…”

Section: Resultsmentioning

confidence: 99%

Utilization of vegetable dumplings waste from industrial production by anaerobic digestion

Pilarska¹,

Pilarski²,

Ryniecki³

et al. 2017

International Agrophysics

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A b s t r a c t. This paper provides the analysis of results of biogas and methane yield for vegetable dumplings waste: dough with fat, vegetable waste, and sludge from the clarifier. Anaerobic digestion of food waste used in the experiments was stable after combining the substrates with a digested pulp composed of maize silage and liquid manure (as inoculum), at suitable ratios. The study was carried out in a laboratory scale using anaerobic batch reactors, at controlled (mesophilic) temperature and pH conditions. The authors present the chemical reactions accompanying biodegradation of the substrates and indicate the chemical compounds which may lead to acidification during the anaerobic digestion. An anaerobic digestion process carried out with the use of a dough-and-fat mixture provided the highest biogas and methane yields.

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“…According to literature reports, the AD process is most typically applied to food waste from restaurants [6][7], either individually or after mixing it with other substrates. Moreover, experiments are carried out with food waste arising in the food processing industry such as sugar beet pulp [8], molasses [9], cheese whey [10], fat [11], coffee waste [12], fruit and vegetable waste [13], and dumpling waste [14]. Those with the use of waste arising in confectionery production are carried only very rarely, even though the material -which is usually highly concentrated and rich in carbohydrates -is a promising substrate for the production of biogas, including methane.…”

Section: Introductionmentioning

confidence: 99%

“…Sewage sludge is one more example of organic waste, used as a substrate for making biogas [7,8,[10][11][12][13][14][15][17][18][19][20]. Among biological methods, which include also aerobic digestion and composting, anaerobic digestion is perceived to be the most environmentally friendly and cost-effective method for neutralization and disposal of sewage sludge [1].…”

Section: Introductionmentioning

confidence: 99%

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

Pilarska

2018

Pol. J. Environ. Stud.

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Food waste (FW) is generated in high volumes and is a serious threat to the environment if utilized improperly or left without control. Conventional methods of FW disposal include combustion, landfi lling, aerobic composting, partial recycling, and other ones. Anaerobic digestion (AD) is the most environmentally friendly of all the methods as it is benefi cial to the populace, and food waste is a suitable material for biogas production.Confectionery waste has rarely been utilized by anaerobic digestion (AD) so far. In this paper, the use of waste wafers (WF) in co-digestion with sewage sludge (SS) is proposed for the fi rst time. Annual volumes of production of WW and SS are expressed in hundreds and thousands of tons, respectively. The materials are generated in high amounts and on an ongoing basis, which is a very important factor regarding potential biogas plant investment projects. The objective of this paper was to analyze the AD process of the test substrates in terms of process stability and biogas capacity. The studies have shown that both the waste wafers as the individual material and with sewage sludge (as the co-substrate) are suitable feedstocks for biogas production. The experiments were carried out for the individual material and for a system with a cosubstrate in the form of raw sewage sludge (SS). In both cases, a digested sewage sludge was used as the inoculum. The studies were performed in a laboratory scale using anaerobic batch reactors under controlled (mesophilic) temperature and pH conditions. The highest yields of biogas and methane were obtained for waste wafers (980. ), than for the wafers (WF). The differences in biogas production for the samples were primarily connected with the substrates' composition, including with the content of readily degradable organic compounds and C/N ratio. The combination of waste wafers with raw sewage sludge has appeared to be benefi cial, as evidenced by the results of microbiological and biochemical analyses. The sample WF_SS was

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Treatment of dairy waste by anaerobic co-digestion with sewage sludge

Cited by 23 publications

References 33 publications

Effect of pH on the Production of Volatile Fatty Acids in Dark Fermentation Process of Organic Waste

Effect of pH on the Production of Volatile Fatty Acids in Dark Fermentation Process of Organic Waste

Utilization of vegetable dumplings waste from industrial production by anaerobic digestion

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

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