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Acid treatment is widely utilized for manipulating tight sedimentary rock tanks, and just how acid influences the microstructure and mechanical property of tight limestone needs much deeper understanding. Tight sedimentary rock cores from Middle Ordovician Yijianfang Formation in Tarim Basin, China, were accumulated to conduct acid coreflooding tests, replicating acid-- rock response procedure between limited sedimentary rock and gelled acid or crosslinked acid. Acid could hardly permeate deep into the core examples with constantly high pumping pressure as much as 8 MPa, revealing that acid-- rock response mainly happened on the rock inlet surface. Gelled acid could permeate into the entire rock inlet surface area and the dimension of dissolved pores and corrosion fractures evidently enlarged as acid concentration increased, comparable with the monotonically reducing pattern of surface area hardness and Young's modulus.
Source link: https://doi.org/10.1007/s00603-021-02650-5
Aims/hypothesis Pohang Tertiary mudstone presents the concern of acid rock water drainage. This research study evaluated the capability of a blended slag to neutralize Pohang Tertiary mudstone's acid rock drainage. The XRF evaluation and the XRD analysis on the mixed slag were conducted to measure the CaO content, which suggests the capacity of the combined slag as an acid-neutralizing agent. Outcomes According to the analysis results on the Pohang Tertiary mudstone examples, the total sulfur content was high, which shows a high danger of acid rock drainage generation. There were small inconsistencies between the samples, in general, the mudstone showed a high acid rock water drainage generation capability. The XRF analysis of blended slag results revealed high amounts of CaO content. The neutralization capacity of the blended slag on Pohang Tertiary mudstone was figured out by the relationship in between maximum prospective acidity and acid neutralization capability.
Source link: https://doi.org/10.1186/s40703-020-00131-2
The metal content and sulfuric acid in this ecosystem originate from the volcanic scene and not from the item of pyrite oxidation. Based on the evaluation of 16S rRNA genetics amplicons, we report the microbial community framework in the immaculate San Cayetano Costa Rican VARD environment. San Cayetano was discovered to be dominated by microorganisms included in the geochemical cycling of nitrogen, sulfur, and iron; nevertheless, the identification and wealth of the species transformed with the oxygen content along the river course. Thermoplasmatales archaea carefully pertaining to environmental phylotypes found in other ARD niches were observed throughout the entire ecosystem. On the whole, our research study shows the differences and resemblances in the diversity and circulation of the microbial areas in between an ARD and a VARD system at the source and along the oxygen gradient that establishes on the course of the river.
Source link: https://doi.org/10.1007/s00248-020-01530-9
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