Resource recovery in line with energy generation at an agro-food industry

doi:10.1007/s11783-024-1914-2

Front. Environ. Sci. Eng.

2024, Vol. 18

Issue (12) : 154 https://doi.org/10.1007/s11783-024-1914-2

Resource recovery in line with energy generation at an agro-food industry

Busem Urediler, Seferhan Yilmaz, Özlem Karahan Özgün, Cigdem Yangin-Gomec(

)

Department of Environmental Engineering, Istanbul Technical University, Istanbul 34469, Türkiye

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Abstract

The aim of this study is to investigate the anaerobic treatability and generation of potential valuable by-products of agro-food industry wastewaters where bulgur production is carried out. Among the agro-food products, bulgur which is a wheat product (Triticum spp.) and rich in fibers, is one of the ancient foods of Anatolia. The most critical issue in bulgur production is high energy and water consumption for cooking where wheat starch gelatinizes and results in a considerable amount of high strength wastewater. In the raw bulgur wastewater sample, 81% of total chemical oxygen demand (tCOD) was in soluble form which was readily fermentable and acidic by nature. Batch anaerobic study results indicated almost complete tCOD removal (99%) which decreased from 7820 to100 mg/L. The cumulative methane yield was determined as 275 mL/g tCOD_fed. Hence, for such industrial wastewaters with high level of organic pollution, anaerobic biotechnology stands out as one of the most effective treatment options. Fermented bulgur wastewater was also tested for the production of polyhydroxyalkanoates (PHAs). It was determined that 37% of the tCOD could be recovered as PHAs without hindering the biogas generation. In this context, it was shown that PHAs and biogas production could be simultaneously achievable with a smart organic carbon utilization strategy which will also contribute to reduce energy requirement and carbon footprint of the industrial bulgur production process as well as create environmentally friendly solutions through resource recovery.

Keywords Biogas Bulgur production Energy Polyhydroxyalkanoates Resource recovery

Corresponding Author(s): Cigdem Yangin-Gomec

Issue Date: 29 October 2024

Cite this article:

Busem Urediler,Seferhan Yilmaz,Özlem Karahan Özgün, et al. Resource recovery in line with energy generation at an agro-food industry[J]. Front. Environ. Sci. Eng., 2024, 18(12): 154.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-024-1914-2
https://academic.hep.com.cn/fese/EN/Y2024/V18/I12/154

Tab.1 Initial substrate characteristics^a) in the batch set

Fig.1 Profiles of (a) COD; (b) pH and alkalinity during anaerobic batch study.

Fig.2 Composition of VFAs at different fermentation periods.

Fig.3 Biogas profile during anaerobic batch study.

Fig.4 OUR responses of fermented bulgur wastewater samples after (a) 2, 4, 7, and (b) 9, 10, and 14 d of fermentation compared with the OUR response of acetate.

Fig.5 (a) OUR, COD and VFA monitoring results of respirometric test for sample (t = 7 d) (b) All VFA monitoring results obtained in the respirometric tests.

Fig.6 Monitoring results for COD utilized and PHA generated for fermented bulgur wastewaters with different anaerobic treatment periods and fraction of tCOD stored as PHA.

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