Anaerobic co-digestion of three organic wastes under mesophilic conditions: lab-scale and pilot-scale studies
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Anaerobic co‑digestion of three organic wastes under mesophilic conditions: lab‑scale and pilot‑scale studies Lamis Yousra Shahrazed Khelifa Zouaghi1 · Hayet Djelal2 · Zineb Salem1 Received: 22 December 2019 / Accepted: 24 September 2020 © Springer Nature B.V. 2020
Abstract An investigation on the efficiency and compatibility of anaerobic co-digestion of three substrates: food wastes (FW), chicken manure (CM) and digested sludge (DS) was carried out. Mixtures of two and three co-substrates in batch experiments were conducted in 0.5-L bioreactors during 8 days under mesophilic conditions. Parameters analysis such as pH, volatile fatty acids, free ammonia (NH3), total solids (TS) and total volatile solids (TVS) was used to explain the behavior of each substrate and their mixtures. For the anaerobic digestion of two co-substrates (CM/DS with 30/70 ratio), total biogas production was equal to 2.5 L and was greater than the volume obtained for the same ratio of FW with DS. The three co-substrates (FW/CM/DS) digestion with (20/10/70) ratio showed best performances for total volatile solids (TVS) reduction and process stability. On the pilot bioreactor, a ratio of (20/5/75) was used for (FW/CM/DS) anaerobic digestion. After 50 days retention time, the biogas production reached 413.85 L/g TVSadd with TS and TVS reduction of 79 and 87% respectively. Keywords Food wastes · Chicken manure · Digested sludge · Mesophilic conditions · Anaerobic co-digestion · Pilot scale
* Lamis Yousra Shahrazed Khelifa Zouaghi [email protected] Hayet Djelal [email protected] Zineb Salem [email protected] 1
Laboratory of Industrial Process Engineering Sciences, University of Sciences and Technology Houari Boumediene, Bab‑Ezzouar 16111, Algiers, Algeria
2
Unilassalle-Ecole Des métiers de L’environnement, Campus de Ker Lann, Bruz, 35170 Rennes, France
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1 Introduction Algeria is the largest country in Africa, located in the northwest of the continent. It is considered as a developing country on the economic and environmental plan. From 2020, the Algerian population will be about 44.3 million, of which 71.1% live in urban area (ONS 2019). The waste generation is estimated to 1.2 kg/cap/year, with a collection rate of 80%, and the municipal solid wastes (MSW) production is about 10.9 M tones/ year (Kehila 2014). Algerian waste management policy has shifted from uncontrolled landfilling to technical landfilling due to its low cost compared to the other treatment processes. However, this method has many disadvantages such as infiltration of leachate into groundwater, the use of large land areas to ensure the burial of large waste streams and the emission of toxic gases. In the near future, Algeria intends to follow the world movement and adhere to a circular economy within the framework of a national strategy of integrated waste management, in order to establish an action program covering the whole cycle from production to transformation. Anaerobic digestion techn
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