科研之友
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摘要
With the discharge standard for nitrate（NO3--N）and Phosphate（PO43--P）become more stringent，the development of nitrate and phosphate removal materials with high efficiency and low-cost has been a hotspot. In this study，two types of pyrrhotites formed by thermally decomposed pyrite and sulfurized hematite can be simultaneously obtained by calcining pyrite and hematite under nitrogen atmosphere at 600 ℃ . Meanwhile，the pyrrhotite-calcite system was developed to treat the simulated wastewater containing nitrate and phosphate. The comparison of simultaneous NO3--N and PO43--P removal efficiency over pyrrhotites，natural pyrrhotite，pyrite，and sulfur were studied. The effects of crystal structures and crystallinity of different pyrrhotites on NO3--N and PO43--P removal were investigated. Moreover，the variations of mineral structure and microbial community were also explored. The results showed that the hexagonal pyrrhotite was the main product of the thermally decomposed pyrite. Meanwhile，the monoclinic pyrrhotite with low crystallinity formed by the sulfurization of hematite displayed excellent NO3--N and PO43--P removal activity（99.8% and 96.8%，respectively）. Results of XRD，SEM，and FE-TEM observation of solid products indicated that pyrrhotite can be effectively utilized by the microbes for denitrification，while the phosphate was mainly removed in the form of FePO4. The microbial community analysis results showed that Thiobacillus and Sulfurimonas were the main functional bacterial genera，in which Thiobacillus was more likely to be enriched in the case of the monoclinic pyrrhotite system. ? 2022 Science Press.
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