The presence of petroleum hydrocarbon components (PHCs) in biological oily sludge increases the toxicity of the sludge and makes dewatering even more difficult. In this study, an atmospheric pressure plasma jet (APPJ) technology was used for treating biological oily sludge. The results showed that under specific conditions—a sludge/water ratio of 1:100, a discharge power of 440 W, and a 60-min treatment—the degradation rate of PHCs reached 36.3 %. APPJ can convert larger molecule PHCs and extracellular polymeric substances, thereby reducing the particle size and viscosity of the sludge. Meanwhile, the sludge volume was reduced and the sludge dewatering efficiency was improved. The hydroxyl radical and superoxide radical generated by APPJ were the main active species involved in the degradation process. This work provides a novel strategy for the reduction of biological oily sludge and the synergistic removal of PHCs along with the sludge.

中文翻译：

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常压等离子射流提高生物含油污泥中的脱水性能并有效降解石油烃


生物含油污泥中石油烃成分 （PHC） 的存在增加了污泥的毒性，使脱水变得更加困难。在本研究中，常压等离子体射流 （APPJ） 技术用于处理生物油性污泥。结果表明，在特定条件下（污泥/水比为 1：100，放电功率为 440 W，处理 60 min），PHCs 的降解率达到 36.3 %。APPJ 可以转化较大分子的 PHC 和细胞外聚合物物质，从而减小污泥的粒径和粘度。同时，污泥量减少，污泥脱水效率提高。APPJ 生成的羟基自由基和超氧自由基是参与降解过程的主要活性物质。这项工作为减少生物含油污泥和协同去除 PHCs 与污泥提供了一种新的策略。