Abstract
The printing and dyeing wastewater produced by different dyes, as well as different printing and dyeing processes, have different components. These wastewater have high toxicity, high organic concentration, and deep chromaticity. Ozone catalytic oxidation is a very promising technical method for wastewater treatment. In this paper, Mn/Mg/Ce ternary catalyst was prepared, and the ozone catalytic oxidation treatment of actual and simulated printing and dyeing wastewater was performed to study the performance of four different carrier catalysts, namely, molecular sieve (MS), silica gel (SG), attapulgite (ATP), and nano alumina (Al2O3), by simulated dynamic test. The effects of reaction time, pH, and catalyst dosage on methyl orange degradation were studied. The results showed that under the optimum treatment conditions (120 min, pH 11, and 12.5 g/L catalyst dosage), the degradation rate of methyl orange reached 96% and the removal rate of the chemical oxygen demand of printing and dyeing wastewater reached 48.7%. This study shows that the treatment effect of ozone catalytic oxidation on printing and dyeing wastewater is remarkably improved after catalyst addition. This study provides a new choice of ozone catalyst for the degradation of printing and dyeing wastewaters in the future.
Highlights
Printing and dyeing wastewater often have high toxicity, high chromaticity, many organic pollutants, and difficult degradation
The characteristic peak at 550 cm−1 belongs to MnO2; the characteristic peaks at 3,712, 1,465, and 435 cm−1 belong to MgO; and the characteristic peaks at 1,464, 723, and 441 cm−1 belong to CeO2
The Fourier transform infrared (FTIR) images of the carriers and catalysts showed that the target element was successfully loaded on the carrier
Summary
Printing and dyeing wastewater often have high toxicity, high chromaticity, many organic pollutants, and difficult degradation. As an efficient and clean advanced oxidation technology, ozone uses the large number of strong oxidizing free radicals produced in the reaction process to oxidize organic matter in water to achieve water purification. The application of ozone catalytic oxidation technology in printing and dyeing wastewater has gradually matured (Takahashi et al, 2012; Mirilă et al, 2020; Tabrizi et al, 2011). The problems of this technology include low oxygen oxidation efficiency and low utilization rate.
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