Lau Yen-Yie, Wong Yee-Shian, Ong Soon-An, Lutpi Nabilah Aminah, Sam Sung-Ting, Teng Tjoon-Tow, Eng Kim-Mun
Faculty of Civil Engineering Technology, Universiti Malaysia Perlis, 02600, Arau, Perlis, Malaysia.
Water Research and Environmental Sustainability Growth, Centre of Excellence (WAREG), Universiti Malaysia Perlis (UniMAP), Arau, Perlis, Malaysia.
Bioprocess Biosyst Eng. 2023 Mar;46(3):359-371. doi: 10.1007/s00449-022-02743-7. Epub 2022 Jul 7.
The under-treated wastewater, especially remaining carcinogenic aromatic compounds in wastewater discharge has been expansively reported, wherein the efficiency of conventional wastewater treatment is identified as the primary contributor source. Herein, the advancement of wastewater treatments has drawn much attention in recent years. In the current study, combined sequential and hybridized treatment of thermolysis and coagulation-flocculation provides a novel advancement for environmental emerging pollutant (EP) prescription. This research is mainly demonstrating the mitigation efficiency and degradation pathway of pararosaniline (PRA) hybridized and combined sequential wastewater treatment. Notably, PRA degradation dominantly via a linkage of reaction: thermal cleavage, deamination, silication and diazene reduction. Thermolysis acts as an initiator for the PRA decomposition through thermally induced bond dissociation energy (BDE) for molecular fragmentation whilst coagulation-flocculation facilitates the formation of organo-bridged silsesquioxane as the final degradation product. Different from conventional treatment, the hybridized treatment showed excellent synergistic degradability by removing 99% PRA and its EPs, followed by combined sequential treatment method with 86% reduction. Comprehensive degradation pathway breakdown of carcinogenic and hardly degradable aromatic compounds provides a new insight for wastewater treatment whereby aniline and benzene are entirely undetectable in effluent. The degradation intermediates, reaction derivatives and end products were affirmed by gas chromatography-mass spectrometry, Fourier transform infrared spectroscopy and ultraviolet-visible spectrophotometry (GC-MS, FTIR and UV-Vis). This finding provides valuable guidance in establishing efficient integrated multiple-step wastewater treatments.
未经充分处理的废水，尤其是排放废水中残留的致癌芳香族化合物，已有大量报道，其中传统废水处理效率被认为是主要污染源。近年来，废水处理技术的进步备受关注。在本研究中，热解与混凝 - 絮凝的联合序批式和混合处理为环境新兴污染物（EP）的处理提供了新进展。本研究主要展示了副蔷薇苯胺（PRA）混合及联合序批式废水处理的缓解效率和降解途径。值得注意的是，PRA的降解主要通过一系列反应：热裂解、脱氨基、硅化和重氮还原。热解通过热诱导键解离能（BDE）引发PRA分解，实现分子碎片化，而混凝 - 絮凝则促进形成有机桥连倍半硅氧烷作为最终降解产物。与传统处理不同，混合处理表现出优异的协同降解性，可去除99%的PRA及其EP，其次是联合序批式处理方法，去除率达86%。对致癌且难降解芳香族化合物的综合降解途径分析为废水处理提供了新视角，使出水完全检测不到苯胺和苯。通过气相色谱 - 质谱联用、傅里叶变换红外光谱和紫外 - 可见分光光度法（GC - MS、FTIR和UV - Vis）确定了降解中间体、反应衍生物和最终产物。这一发现为建立高效的集成多步废水处理提供了有价值的指导。
