Anaerobic co-digestion of poultry droppings and briquetted wheat straw at mesophilic and thermophilic conditions: Influence of alkali pretreatment. (December 2018)

• Record Type: Journal Article
• Authors: Rahman, Md. Anisur; Møller, Henrik Bjarne; Saha, Chayan Kumer; Alam, Md. Monjurul; Wahid, Radziah; Feng, Lu
• Is Part Of: Renewable energy. Volume 128(2018)Part A
• Page Start: 241
• Page End: 249
• Publication Date: 2018-12
• Subjects: Poultry droppings -- Briquetted wheat straw -- Thermophilic -- Mesophilic -- KOH additive -- Biomethane; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2018.05.076
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: Anaerobic co-digestion of poultry droppings (PD) and briquetted wheat straw (BWS) with alkali additive in the form of KOH (BWSadd ) or without any additive (BWSraw ) was conducted using continuously stirred tank reactors (CSTRs) under both mesophilic (35 °C) and thermophilic (53 °C) conditions. The aims of the study were to compare 1) co-digestion of PD and BWS versus mono-digestion of PD; 2) co-digestion of PD and BWS with or without additives; and 3) mesophilic and thermophilic anaerobic digestion (AD). Co-digestion of PD and BWS was superior to mono-digestion of PD in terms of gas production. Co-digestion of PD with BWSadd at thermophilic temperatures resulted in a higher methane volumetric yield per kg substrate compared to mesophilic conditions. With and without additive, co-digestion with BWS produced 8% and 11% higher yields at thermophilic conditions than at mesophilic conditions. Co-digestion of PD with BWSadd resulted in, respectively, 14% and 27% more methane produced at mesophilic and thermophilic conditions over mono-digestion of PD. When mono-digesting PD, the mesophilic temperature was superior to the thermophilic since methane yield was higher in the mesophilic temperature regime. Highlights: Mesophilic mono-digestion of poultry dropping (PD) is superior to thermophilic. Thermophilic co-digestion of PD with straw works better than mesophilic. Pre-treatment of straw with 2%w/w KOH promotes hydrolysis rate and methane yield.