Wastewater from the coal chemical industry contains large amounts of refractory organic compounds that pose a serious threat to the environment. This paper proposes a pre-treatment method based on gamma irradiation to improve the biodegradation characteristics of coal chemical industry wastewater. Samples containing phenol, hydroquinone, p-cresol, and quinoline were irradiated using 60Co gamma source at an absorbed dose of 20 kGy. The results showed that the chemical oxygen demand slightly decreased with increasing absorbed dose, whereas the BOD5/COD ratio increased from 0.044 to 0.310, indicating a significant enhancement in biodegradability induced by gamma irradiation. Anaerobic digestion tests showed that the cumulative gas production for wastewater samples with initial concentrations of 40, 60, and 80 mg/L increased by 161.78%, 64.07%, and 35.51%, respectively, at 20 kGy, compared to that for the unirradiated samples. The ultraviolet spectrum analysis and infrared spectrum analysis results showed that the concentrations of aldehyde and ketone small molecule organics increased, and there were more biodegradable organic substances in the wastewater samples after irradiation. Microbial colony analysis revealed beneficial changes in the methanogenic archaea during the Anaerobic digestion (AD) process and increased the stability of the anaerobic fermentation system.

中文翻译：

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电离辐照对合成煤化工废水生物降解特性的影响


煤化工废水中含有大量难降解有机化合物，对环境构成严重威胁。本文提出了一种基于伽马辐照的预处理方法，以改善煤化工废水的生物降解特性。使用 60Co γ 源以 20 kGy 的吸收剂量照射含有苯酚、对苯二酚、对甲酚和喹啉的样品。结果表明，随着吸收剂量的增加，化学需氧量略有降低，而 BOD5/COD 比率从 0.044 增加到 0.310，表明伽马辐照诱导的生物降解性显着增强。厌氧消化试验表明，初始浓度为 40 、 60 和 80 mg/L 的废水样品在 20 kGy 时，与未辐照样品相比，累积产气量分别增加了 161.78%、64.07% 和 35.51%。紫外光谱分析和红外光谱分析结果表明，辐照后废水样品中醛和酮类小分子有机物浓度增加，且可生物降解有机物较多。微生物菌落分析揭示了厌氧消化 （AD） 过程中产甲烷古菌的有益变化，并增加了厌氧发酵系统的稳定性。