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In situ treatment of metalworking wastewater by chemical addition-dissolved air flotation coupled with UV H2O2 ZnO

机译：化学加溶-气浮结合UVH2O2和ZnO原位处理金属加工废水

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The hybrid treatment techniques have been proven that could be a proper solution to the metalworking fluid (MWF) wastewaters disposal challenge. Hence, this investigation was conducted aim to the assessment of chemical addition-dissolved air floatation (CA-DAF) unit followed with a heterogeneous photocatalytic (PC) process as UV/H O /ZnO to treat MWF wastewater produced in one of the central industrial estates in the Middle East. The CA-DAF unit was implemented as trial and errors and had an appropriate efficiency. However, the environmental discharge standards were not achieved only by this unit, so that, a PC process considered for this purpose in a pilot-scale reactor. And also, Chemical oxygen demand (COD), total petroleum hydrocarbons (TPHs) were considered as physicochemical parameters to analyze the applied photochemical reaction throughout the concentrations of ZnO and H O , and pH value as variables of the study. The ideal and optimized conditions were observed at pH 10, 600 mg l of ZnO, and 13.11 g l of H O via 99.87% and 97.9% reduction rates in total COD and TPH, respectively. These removal rates were obtained for this integrated strategy under the optimized reaction. By evaluating the synergistic effect, it was found that UV/ZnO could be a predominant reaction in this process. The organic and intermediates analysis appeared 78.46% reduction for all detected organic matters. Besides, PC generation of bis phthalate, mono phthalate, benzene, and benzoic acid to 2,6-bis (1,1-dimethylethyl)-4-mthyl phenol was the reason of the residual phenolic compound concentration in the reaction solution with low removal rate. The kinetic study showed that this reaction could be well fitted with the pseudo-first-order kinetic model by equal with 0.973 and 0.988 in turn for COD and TPH. The expenditures to treat 1 m of the CA-DAF was estimated at 5.335 us$ via cost analysis. Finally, the collected findings indicate that CA-DAF integrated with UV/H O /ZnO can be an efficient approach in the MWF wastes disposal or treatment for reuse.
机译：混合处理技术已被证明可以很好地解决金属加工液（MWF）废水处理难题。因此，本研究旨在评估化学加成溶解气浮（CA-DAF）单元，然后采用非均相光催化（PC）工艺作为UV / HO / ZnO处理中央工业区之一产生的MWF废水。在中东。 CA-DAF部门是作为试错法实施的，具有适当的效率。然而，仅通过该装置不能达到环境排放标准，因此，在中试规模的反应器中为此目的考虑了PC法。并且，化学需氧量（COD），总石油烃（TPHs）被视为理化参数，以分析整个ZnO和H O的浓度和pH值作为应用变量的应用光化学反应。在pH 10、600 mg l的ZnO和13.11 g l的H O上观察到了理想和优化的条件，总COD和TPH的减少率分别为99.87％和97.9％。这些去除率是在优化的反应条件下获得的。通过评估协同作用，发现UV / ZnO可能是该过程中的主要反应。对于所有检测到的有机物，有机物和中间体分析显示减少了78.46％。此外，双邻苯二甲酸酯，单邻苯二甲酸酯，苯和苯甲酸的PC生成为2,6-双（1,1-二甲基乙基）-4-甲基苯酚是反应溶液中残留酚类化合物浓度低，去除率低的原因。率。动力学研究表明该反应可以很好地拟合拟一阶动力学模型，对于COD和TPH分别等于0.973和0.988。通过成本分析，治疗1 m CA-DAF的支出估计为5.335美元。最后，收集到的结果表明，将CA-DAF与UV / H O / ZnO集成在一起可以成为MWF废物处理或再利用的有效方法。

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