Anaerobic codigestion of livestock manure and agro-industrial waste in a CSTR reactor: Operational aspects, digestate characteristics, and microbial community dynamics

IF 9 1区工程技术 Q1 ENERGY & FUELS

Renewable Energy Pub Date : 2024-11-17 DOI:10.1016/j.renene.2024.121865

Cristina Harumi Enokida , Deisi Cristina Tapparo , Fabiane Goldschmidt Antes , Ricardo Luis Radis Steinmetz , Flaviane Eva Magrini , Igor Vinicius Machado Sophiatti , Suelen Paesi , Airton Kunz

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Abstract

Anaerobic codigestion of animal manure and agro-industrial waste offers an efficient alternative to monodigestion, due to the synergy between different substrates. This study investigated the digestion of five types of waste: swine manure, cattle manure, poultry hatchery waste, bone and protein waste, and dissolved air flotation sludge. Biochemical Methane Potential tests and a codigestion trial in a CSTR reactor were conducted, with increases in organic loading rate (OLR). The genera Clostridium_sensu_stricto_1 and DTU014, belonging to the phylum Firmicutes, predominated in the codigestion. The archaeal community was dominated by Methanosaeta and Methanosarcina. Genes encoding enzymes related to acetoclastic methanogenesis were predicted to be more abundant in the initial phases, demonstrating that despite fluctuations in physicochemical parameters an adaptation process occurred. The results showed that in an OLR of 3.67 kg_VSadd m⁻³_reactor d⁻¹ exhibited the best performance, with a methane yield of 521 L_NCH4 kg_VSadd d⁻¹ and a methane productivity of 1.91 L_NCH4 L_reactor⁻¹ d⁻¹. Digestate analysis revealed an increase in nutrient concentration, particularly nitrogen, indicating its potential as a biofertilizer. This study confirms the feasibility of anaerobic codigestion for optimizing biogas production and utilizing waste with different characteristics, promoting a sustainable and circular economy approach for the agro-industrial and livestock waste management.

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在 CSTR 反应器中对牲畜粪便和农用工业废物进行厌氧联合消化：运行方面、消化物特性和微生物群落动力学

由于不同基质之间的协同作用，动物粪便和农用工业废物的厌氧联合消化是单一消化的有效替代方法。本研究调查了五种废物的消化情况：猪粪、牛粪、家禽孵化场废物、骨和蛋白质废物以及溶气气浮污泥。在 CSTR 反应器中进行了生化甲烷潜能值测试和协同消化试验，并提高了有机负荷率（OLR）。属于真菌门的梭状芽孢杆菌属（Clostridium_sensu_stricto_1）和 DTU014 属在协同消化中占主导地位。古细菌群落以 Methanosaeta 和 Methanosarcina 为主。据预测，编码与乙酰甲烷生成相关的酶的基因在初始阶段更为丰富，这表明尽管理化参数存在波动，但仍发生了适应过程。结果表明，在 OLR 为 3.67 kgVSadd m-3reactor d-1 的条件下，甲烷产量为 521 LNCH4 kgVSadd d-1，甲烷生产率为 1.91 LNCH4 Lreactor-1 d-1，表现最佳。沼渣分析表明，养分（尤其是氮）浓度有所增加，这表明沼渣具有作为生物肥料的潜力。这项研究证实了厌氧混合消化法在优化沼气生产和利用不同特性废物方面的可行性，促进了农用工业和畜牧业废物管理的可持续和循环经济方法。

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来源期刊

Renewable Energy 工程技术-能源与燃料

CiteScore

18.40

自引率

9.20%

发文量

1955

审稿时长

6.6 months

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