A pilot scale study on synergistic effects of co-digestion of pig manure and grass silage

Xie, Sihuang; Lawlor, Peadar G.; Fröst, Peter; Dennehy, Conor; Hu, Zhenhu; Zhan, Xinmin

doi:10.1016/j.ibiod.2017.07.005

Cited by 34 publications

(14 citation statements)

References 49 publications

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“…Thus, it can be concluded that co‐digestion contributes to pH regulation and avoids problems of inhibition associated with acidification which appears using pear waste as a single‐substrate (Arhoun et al, 2013). The SMP obtained in the present work was close to those obtained for mono‐digestion and co‐digestion of pig slurry with grass silage (average values of 154 and 251 L kgVS −1 , respectively) (Xie et al, 2017).…”

Section: Resultssupporting

confidence: 85%

Effect of pretreatment and co‐substrate addition on biogas production from pig slurry

Arhoun

García

Villén-Guzmán

et al. 2021

Water & Environment J

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The anaerobic digestion of pig slurry samples collected from different points of a farm and raw pig slurry pretreated by centrifugation and decantation was first studied. The specific methane production of raw pig slurry and after centrifugation and decantation pretreatment was 158, 24 and 42.34 L kgVS−1, respectively. Second, the anaerobic digestion of the mixture of raw pig slurry and decanted solid fraction at different organic loading rate (1.364–3.41 gVS·L−1·d−1) results in a specific methane production of 249 ± 37·L kgVS −1. The concentration of ammonium ion in the digester increased to 2500 mg L−1 without inhibition. Lastly, the co‐digestion of pear waste and raw pig slurry was also analysed, which enhanced the specific methane production (243 L kgVS−1). This work deals with the integral management of pig slurry and points out the possibility of revalorization of other wastes in the same digester.

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Section: Resultssupporting

confidence: 85%

Effect of pretreatment and co‐substrate addition on biogas production from pig slurry

Arhoun

García

Villén-Guzmán

et al. 2021

Water & Environment J

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“…Finally, the most notable of these features was the biogas yield. Xie et al [48] conducted a similar pilot-scale test of a continuous stirred tank reactor (CSTR), and they detected 251 mL CH 4 g −1 •VS −1 at an organic load rate of 1.74 kg VS m −3 •d −1 with a hydraulic retention time of 30 days. The methane yields obtained from the PM and CM co-digestion systems of this study were 276 L kg −1 •TS −1 and 267 L kg −1 •TS −1 , respectively, which are relatively higher.…”

Section: Biogas Yieldmentioning

confidence: 99%

Application of Rumen Microorganisms for Enhancing Biogas Production of Corn Straw and Livestock Manure in a Pilot-Scale Anaerobic Digestion System: Performance and Microbial Community Analysis

2018

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This study aimed to assess the feasibility of rumen microorganisms inoculated in a modified pilot-scale system for enhancing biogas production of (1) solely corn straw (CS) and (2) CS with livestock manure under different solid contents and mixture ratios. The biogas liquid was proven to pretreat CS at this scale. The digestion system was started up within 32 days at a retention time of 20 days. The rumen culture was found to have a positive response to the impact on temperature and pH. The optimal solid content of CS was detected to be 3%, resulting in a stable biogas yield of 395 L kg −1 •total solid (TS) −1. A higher biogas yield of 400 L kg −1 •TS −1-420 L kg −1 •TS −1 was achieved at a solid content of 10% organic loading rate (OLR, 4.42 kg volatile solid (VS) m −3 •d −1) in co-digestion systems with CS and livestock manure. The methane content could be maintained at about 60%. Hydrogenotrophic methanogens were dominated by Methanobacterium in the solely CS digestion system, and two methanogenetic pathways, including hydrogenotrophic and acetoclastic methanogens by Methanosarcina and Methanobacterium, co-occurred for methane production during the co-digestion of CS with pig manure (PM). This study indicates that rumen microbes could be utilized in a pilot-scale digestion system and that they greatly promoted the biogas yield.

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“…Astals et al [24] reported an increase in the methane yield of microalgae from 0.163 to 0.245 m 3 CH4 kg -1VS (volatile solids) by applying the co-digestion with swine manure [27] reached 0.187 m 3 CH4 kg -1 VS in pig manure digestion, compared to 0.388m 3 CH4 kg -1 VS in pig manure and food waste co-digestion, in the ratio 17:83, respectively. This increase is due to overcoming ammonia inhibition which is sometimes a feature in digestion of pure manure and optimizing the carbon to nitrogen (C/N) ratio in the feedstock for the AD [28]. Although the C/N ratio is widely used to explain the synergies that occur during anaerobic co-digestion, specific microbes from pig manure, macro and micronutrients, and alkalinity can be also linked [29].…”

Section: Biodigester Feeding -Organic Load In Terms Of Volatile Solidsmentioning

confidence: 99%

Insights to improve covered lagoon biodigesters through by-products recovery in pig farms

Almeida

Oliveira

Sousa

et al. 2021

Environmental Research and Technology

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Pig farming activity has an important role in the Brazilian economy and generates effluents with a high polluting potential. The covered lagoon biodigester is a simple and suitable alternative for the treatment of swine manure. This work aimed to propose improvements to the pig effluent treatment system composed by covered lagoon biodigesters. Therefore, a survey of a typical plant configuration of pig effluent treatment was accomplished and alternatives were suggested in order to get a greater energy sustainability in farms through resource recovery. The proposed interventions were based on studies of scientific papers, technical equipment manuals, technical research and consultation with professionals of the field. Th e op timization of the systems operation considers some criteria, such as: (i) need for solids removal; (ii) organic loading; (iii) operation temperature; (iv) effluent recirculation; and (v) biogas energy recovery. Firstly, a typical scenario was identified without any improvements, in which the biogas is sent to flares without energy recovery. Subsequently, systems improvement insights were proposed, mainly regarding effluent heating through a solar heating system or by recovering the thermal energy from biogas and biogas recovering. The treatment optimization would increase the efficiency of organic matter re moval and bi ogas production, as well as el ectric energy production and reduction in greenhouse gases emissions. The use of tools such as Life Cycle Analysis (LCA) can favor decision making and comparing proposed alternatives.

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A pilot scale study on synergistic effects of co-digestion of pig manure and grass silage

Abstract: A pilot scale study on synergistic effects of co-digestion of pig A pilot scale study on synergistic effects of co-digestion of pig manure and grass silage

Cited by 34 publications

References 49 publications

Effect of pretreatment and co‐substrate addition on biogas production from pig slurry

Effect of pretreatment and co‐substrate addition on biogas production from pig slurry

Application of Rumen Microorganisms for Enhancing Biogas Production of Corn Straw and Livestock Manure in a Pilot-Scale Anaerobic Digestion System: Performance and Microbial Community Analysis

Insights to improve covered lagoon biodigesters through by-products recovery in pig farms

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