Recognition on characteristics and applicability of typical modes for manure &amp; sewage management in pig farming: A case study in Hebei, China

Shi, Boyang; Wang, Shu; Jiao, Jian; Yin, Changbin

doi:10.1016/j.wasman.2022.05.018

Cited by 12 publications

(1 citation statement)

References 61 publications

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“…Presently, the predominant focus lies on the environmental assessment of large-scale farms, potentially neglecting the environmental impact posed by their small and mediumsized counterparts. Research indicates that many small and medium-sized pig farms encounter challenges in adopting cutting-edge treatment technologies and equipment due to financial constraints [75]. Consequently, a prevalent practice involves directly returning manure to fields for treatment.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Solid–Liquid Separation and Its Environmental Impact on Manure Treatment in Scaled Pig Farms—Evidence Based on Life Cycle Assessment

Zhang,

Bo,

et al. 2023

Agriculture

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Recently, there has been a significant focus on the issue of pollution caused by livestock and poultry rearing, which is recognized as a prominent contributor to nonpoint source pollution in the agricultural sector. This study employed the life cycle assessment (LCA) methodology to evaluate the environmental impact of several pig manure processing scenarios with the aim of determining the appropriate solid–liquid separation tool for large-scale pig farms. The findings indicate that the utilization of a screw extruder for solid–liquid separation in Scenario 2 has a lower environmental impact. In contrast to Scenario 1, Scenario 2 exhibits reduced environmental potential in the areas of global warming, human toxicity, acidification, and eutrophication. Specifically, the global warming, human toxicity, acidification, and eutrophication impacts decreased by 56%, 81%, 83%, and 273%, respectively, due to the implementation of solid–liquid separation. The type of solid–liquid separation equipment used during the processing of swine manure, as well as the subsequent treatment, have a significant impact on environmental emissions. Compared to Scenario 2, Scenario 3, which utilizes a centrifugal microfilter for solid–liquid separation, exhibits a lower environmental impact in terms of human toxicity, resulting in a reduction of 0.736 kg DCB-eq. In general, solid–liquid separation is a viable and environmentally friendly method for the disposal of waste from large-scale pig farms. The adoption of this method is highly recommended. During its implementation, careful consideration should be given to factors such as separation efficiency and pollution emissions. It is crucial to select appropriate equipment for solid–liquid separation to effectively process the waste.

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Section: Conclusion and Discussionmentioning

confidence: 99%