Effect of carbon-rich-waste addition as co-substrate on the performance and stability of anaerobic digestion of abattoir wastewater without agitation

Abstract

Multiple wastes' co-digestion is one of the alternatives for improved anaerobic digestion (AD) process of industrial and municipal wastes. The present work investigated the influence of fruit-vegetable solid waste (FVW) addition as a co-substrate on the performance of AD of abattoir wastewater (AWW). The co-digestion was done at a lab-scalebased experiment under mesophilic condition using a two-phase anaerobic sequencing batch reactor without agitation. It was tested at different mixing ratios (100%AWW; 75%AWW:25%FVW; 50%AWW:50%FVW; 25%AWW:75%FVW; 100%FVW) with the intention of looking for the best mixing ratio with the best performance. It was fed on a semicontinuous basis and operated for 18 days (d) total retention time (HRT): 3 days for the acidogenesis reactor and 15 days for methanogenesis reactor. The addition of FVW enhanced biogas yield and VS removal by 70.26% and 57.11%, respectively, at optimum mixing ratio. Moreover, to some extent improvement of AD process stability verified by the decreased TVFA:TAlk ratio and free ammonia nitrogen was observed upon progressive addition of FVW. Finally, this co-digestion process should further be studied for its performance at different HRTs with agitation.

Optimization of operating parameters for biogas production using two-phase bench-scale anaerobic digestion of slaughterhouse wastewater: Focus on methanogenic step

“…As ORP is used to define the environment of biochemical reactions and the ORP obtained favors the methane reducing bacteria and inhibitory to sulfate-reducing bacteria which is in agreement by the finding reported by Duangmanee ( 2009 ). The negative ORP values indicate that reduced substances like methane and ammonia are produced from the degradation of the wastewater (Hailu et al 2020 ). The negative value of ORP in the present study also shows the working condition, i.e., anaerobic type and an indicator of methane production possibility as also demonstrated by Vongvichiankul et al ( 2017 ).…”

“…The biogas produced is comparable with the result reported by Demirer and Chen (2004) and Sindhu and Meera (2012) in the treatment and biogas production from the same feedstock. Moreover, increasing OLR can reduce the contact period of methanogenic bacteria consortia and feed-stock (Hailu et al 2020). Increasing the OLR/decreasing HRT up to a certain level increases the biogas production but further increase can decreases/do not affect biogas production (Hailu, Asfaw, and Tegaye 2020;Demirer and Chen 2004;Worku and Leta 2017;Berhe and Leta 2018;Kavitha and Murugesan 2007).…”

“…Moreover, increasing OLR can reduce the contact period of methanogenic bacteria consortia and feed-stock (Hailu et al 2020). Increasing the OLR/decreasing HRT up to a certain level increases the biogas production but further increase can decreases/do not affect biogas production (Hailu, Asfaw, and Tegaye 2020;Demirer and Chen 2004;Worku and Leta 2017;Berhe and Leta 2018;Kavitha and Murugesan 2007). The biogas production rate was computed with VS reduced in the process.…”

Microalgae and co-culture for polishing pollutants of anaerobically treated agro-processing industry wastewater: the case of slaughterhouse

“…In developing countries, more than ninety percent of the agro-processing industries discharge partially treated or untreated effluents recklessly into the environment. The effluents from the agro-processing industries as well as anaerobic digestion (AD) effluents are known for their high organic matter, nutrients, and other pollutants that are unsafe to the receiving water bodies or environment (Zemene Worku and Seyom Leta 2017 ; Ashekuzzaman et al 2019 ; Bustillo-Lecompte and Mehrvar 2015 ; Hailu et al 2020 ; Yirgu et al 2020 ; K. Praveen et al 2018 ; Leta et al 2003 ), directing post-treatment process requirement to minimize or remove organic matters as organic and inorganic forms of phosphorus and nitrogen of the effluents (De Nardi et al 2011 ; Chevalier et al 2000 ; Dawana and Kassa 2020 ; Tsegaye and Leta 2022 ). If directly released, it results in eutrophication of the receiving water bodies and other environmental risks associated with greenhouse gas emissions from ammonia volatilization, groundwater nitrogen contamination, or pollution, and also affects human health via the food chain (Akar and Tunali 2005 ; Carey and Migliaccio 2009 ; Fornarelli, Bahri, and Moheimani 2017 ).…”

Feeding controls H2S production in situ in high solid anaerobic digestion

“…Anaerobic digestion (AD) can transform organic matter into energy and organic fertilizer, thereby achieving a reduction in waste and resource recovery that is of minimal environmental harm (Wafi et al 2019 ; Adrover et al 2020 ). Given these advantages, this technology has been widely used globally (Li et al 2014 ; Hailu et al 2020 ). AD is the main technology used within the treatment of animal manure (Tayibi et al 2021 ; Wu et al 2022 ).…”