Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, PR China.
Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou 510006, PR China.
J Hazard Mater. 2022 Aug 5;435:129087. doi: 10.1016/j.jhazmat.2022.129087. Epub 2022 May 6.
It is urgent to remove polycyclic aromatic hydrocarbons (PAHs) from textile dyeing sludge (TDS) before its final deposal due to their recalcitrant nature and generation of toxic byproducts during TDS treatment. In this study, an electrochemical Fe-activated peroxymonosulfate (PMS) oxidation process for removing 16 priority PAHs from real TDS was firstly investigated. The results showed that the removal efficiency of the ∑16PAHs in TDS was positively correlated to the concentration of Fe released from sacrificial iron anode and the concentration of electroregenerated Fe in the cathode by the reduction of Fe within the applied voltage range of 3-7 V, but a higher voltage of 10 V did not lead to further improvement in ∑16PAHs removal due to the radical scavenging reaction resulted from the excessive accumulation of Fe. 64.7% and 16.1% of the ∑16PAHs were removed in the anodic and cathodic chamber under the optimum reaction conditions of 400 mg/g PMS/VSS, pH 3 and applied voltage 7 V, respectively. low-ring PAHs were preferentially degraded compared to high-ring PAHs. The O⋅Hplayed a major role while SOhad a minor role in PAHs degradation in TDS. The intracellular PAHs released from cracked sludge cells were found to undergo further degradation under free radical attack.
由于纺织染料污泥 (TDS) 中多环芳烃 (PAHs) 的顽固性及其在 TDS 处理过程中产生有毒副产物，因此在最终处置之前必须将其去除。在这项研究中，首次研究了电化学 Fe 激活过一硫酸盐 (PMS) 氧化工艺，用于去除实际 TDS 中的 16 种优先 PAHs。结果表明，∑16PAHs 在 TDS 中的去除效率与从牺牲铁阳极释放的 Fe 浓度和通过施加电压范围内的还原在阴极中电再生的 Fe 浓度呈正相关3-7 V，但由于 Fe 的过度积累导致自由基清除反应，较高的 10 V 电压不会进一步提高∑16PAHs 的去除效率。在最佳反应条件下，即 400 mg/g PMS/VSS、pH 3 和 7 V 施加电压下，阳极和阴极室中分别去除了∑16PAHs 的 64.7%和 16.1%。与高环 PAHs 相比，低环 PAHs 优先降解。在 TDS 中，O⋅H 在 PAHs 降解中起主要作用，而 SOh 作用较小。从破裂污泥细胞中释放的细胞内 PAHs 在自由基攻击下被发现进一步降解。
