2022
DOI: 10.1371/journal.pone.0272013
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Chemical and microbial characterization of sugarcane mill mud for soil applications

Abstract: Sugarcane mill mud/filter cake is an activated sludge-like byproduct from the clarifier of a raw sugar production factory, where cane juice is heated to ≈90°C for 1–2 hr, after the removal of bagasse. Mill mud is enriched with organic carbon, nitrogen, and nutrient minerals; no prior report utilized 16S rRNA gene sequencing to characterize the microbial composition. Mill mud could be applied to agricultural fields as biofertilizer to replace or supplement chemical fertilizers, and as bio-stimulant to replenish… Show more

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Cited by 9 publications
(8 citation statements)
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“…In Fig 4A , mill mud-amended soil (2 wt% mill mud, red circle as 3 biological replicates) is separated from mill mud before soil application (purple) and soil samples without mill mud (blue and green). Based on the heat map ( Fig 4B ), the factory mill mud (before greenhouse experiments) was dominated by Firmicutes phylum (Clostridiaceae to Leuconostocaceae in uppermost rows) that survived the elevated temperatures (90°C for 1–2 h) during the raw sugar production process, as described previously [ 10 ]. In addition, Fig 4B shows lower levels of Proteobacteria from the family Pseuomonadaceae (that includes known plant pathogens [ 36 ]) in mill mud and mill mud-amended soil (2% MM) than the fertilized or control soils.…”
Section: Resultsmentioning
confidence: 99%
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“…In Fig 4A , mill mud-amended soil (2 wt% mill mud, red circle as 3 biological replicates) is separated from mill mud before soil application (purple) and soil samples without mill mud (blue and green). Based on the heat map ( Fig 4B ), the factory mill mud (before greenhouse experiments) was dominated by Firmicutes phylum (Clostridiaceae to Leuconostocaceae in uppermost rows) that survived the elevated temperatures (90°C for 1–2 h) during the raw sugar production process, as described previously [ 10 ]. In addition, Fig 4B shows lower levels of Proteobacteria from the family Pseuomonadaceae (that includes known plant pathogens [ 36 ]) in mill mud and mill mud-amended soil (2% MM) than the fertilized or control soils.…”
Section: Resultsmentioning
confidence: 99%
“…Fresh sugarcane mill mud was collected directly from the heated conveyor belt press filter of a commercial sugarcane processing factory in Louisiana during the 2021 harvest season. This sample is equivalent to “Mud-LA2” (from previous harvest season) in our previous report [ 10 ], where its chemical and microbial properties were described in detail. Air-drying, freezing, and other pretreatments could change the intact microbial community of biomass samples [ 20 , 21 ].…”
Section: Methodsmentioning
confidence: 99%
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“…Amplicon-based sequencing has wide-ranging applications in the food industry, from plant-microbiome interactions, animal health, food safety, and production of fermented foods ( 18 ). While a few studies have applied amplicon sequencing to sugarcanes in fields ( 19 21 ), bioethanol refineries ( 22 ), and more recently filter mud and bagasse ( 23 ), this study profiled the microbes present in crusher juices, mixed juices, and biofilm samples from raw sugar factories, to focus on the microbes which are most closely involved in postharvest deterioration of sugarcane juice. Additionally, the NCBI RefSeq database ( 24 ) was leveraged to estimate the likelihood for the identified bacterial taxa to contribute to dextran and levan EPS production.…”
Section: Introductionmentioning
confidence: 99%