Effect of microaerophilic treatment on swine wastewater (SWW) treatment: Engineering and microbiological aspects

Oliveira, Maurício Guimarães de; Mourão, José Marcos Marques; Silva, Francisco Schiavon Souza; Santos, André Bezerra dos; Pereira, Erlon Lopes

doi:10.1016/j.jenvman.2021.113598

Cited by 5 publications

(1 citation statement)

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“…To reduce the negative impacts of SW, some physico-chemical methods have been adopted to recover organics and nutrients [6,7]. In addition, various microbial treatment systems such as aerobic, anaerobic, and even ecological systems were designed and applied into practice [8][9][10]. However, the high energy input and low pollutant removal efficiency of these methods are not suitable for SW treatment.…”

Section: Introductionmentioning

confidence: 99%

Pollutant Removal and Energy Recovery from Swine Wastewater Using Anaerobic Membrane Bioreactor: A Comparative Study with Up-Flow Anaerobic Sludge Blanket

Tang

Zeng

et al. 2022

Water

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Due to its high content of organics and nutrients, swine wastewater has become one of the main environment pollution sources. Exploring high-efficient technologies for swine wastewater treatment is urgent and becoming a hot topic in the recent years. The present study introduces anaerobic membrane bioreactor (AnMBR) for efficient treatment of swine wastewater, compared with up-flow anaerobic sludge blanket (UASB) as a traditional system. Pollutant removal performance, methanogenic properties, and microbial community structures were investigated in both reactors. Results showed that by intercepting particulate organics, AnMBR achieved stable and much higher chemical oxygen demand (COD) removal rate (approximately 90%) than UASB (around 60%). Due to higher methanogenic activity of anaerobic sludge, methane yield of AnMBR (0.23 L/g-COD) was higher than that of UASB. Microbial community structure analysis showed enrichment of functional bacteria that can remove refractory organic matter in the AnMBR, which promoted the organics conversion processes. In addition, obvious accumulation of acetotrophic and hydrotrophic methanogens in AnMBR system was recorded, which could broaden the organic matter degradation pathways and the methanogenesis processes, ensuring a higher methane yield. Through energy balance analysis, results concluded that the net energy recovery efficiency of AnMBR was higher than that of UASB system, indicating that applying AnMBR for livestock wastewater treatment could not only efficiently remove pollutants, but also significantly enhance the energy recovery.

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