Çataklı Tercan, Erguder Tuba Hande
Department of Environmental Engineering, Middle East Technical University, 06800, Ankara, Turkey.
Biodegradation. 2024 Dec 2;36(1):10. doi: 10.1007/s10532-024-10105-1.
This study focused on a new approach for valorization of both ground tire rubber (GTR) and nitrate-containing wastewater via simultaneous devulcanization and denitrification. Initially, sulfur-based autotrophic denitrifiers were successfully enriched from three different seed sludge sources, biological nutrient removal (BNR) sludge, anaerobic digester sludge and BNR sludge of a leather organized industrial zone WWTP. Average nitrate removal efficiencies were 96-98%. Biological devulcanization (biodevulcanization) of GTR was later investigated with these enriched cultures. Results revealed that biodevulcanization was only achieved with the culture enriched from BNR sludge of the leather organized industrial zone WWTP, as 3.9% sulfur removal (desulfurization efficiency). Metal sulfate precipitation was speculated to cause an underestimation of the desulfurization ratio. Fourier-transform infrared spectroscopy (FTIR) results demonstrated a decrease in the intensity of the C-S bonds and an increase in intensity of S-O bonds in treated GTR samples. This was attributed to the oxidation of sulfidic crosslinks, i.e. verification of biodevulcanization. This study indicated that simultaneous biodevulcanization and denitrification could be a promising process for valorization of both GTR and nitrate-containing wastewater which in turn would support circular economy and sustainable development.
本研究聚焦于一种通过同步脱硫和反硝化实现废轮胎胶粉（GTR）和含硝酸盐废水资源化利用的新方法。最初，从三种不同的种子污泥来源成功富集了基于硫的自养反硝化菌，即生物营养物去除（BNR）污泥、厌氧消化池污泥以及一个皮革产业园区污水处理厂的BNR污泥。平均硝酸盐去除效率为96% - 98%。随后用这些富集培养物研究了GTR的生物脱硫（生物降解硫化）。结果表明，仅用皮革产业园区污水处理厂的BNR污泥富集的培养物实现了生物脱硫，脱硫率为3.9%。推测金属硫酸盐沉淀导致脱硫率被低估。傅里叶变换红外光谱（FTIR）结果表明，处理后的GTR样品中C - S键强度降低，S - O键强度增加。这归因于硫化交联键的氧化，即生物脱硫得到证实。本研究表明，同步生物脱硫和反硝化可能是一种很有前景的GTR和含硝酸盐废水资源化利用工艺，这反过来将支持循环经济和可持续发展。
