Abstract
The existing methods for simultaneous treatment of wastewater containing high concentrations of chemical oxygen demand (COD) and boron are too cumbersome and require a relatively long treatment time. The traditional oxidation method is easy to cause a large amount of sludge and other secondary pollution. Therefore, in this research, the wastewater was oxidized by the self-synthesized manganese-iron oxide catalytic support. This oxidation and adsorption combined method significantly increased the efficiency of wastewater treatment, reduced the treatment time and the replacement frequency of consumables. The efficiency in degradation of high-concentration COD (25,250 mg/L) was more than 90%, which could be reached within 40 min, while that of boron (500 mg/L) could reach above 95% within 20 min. After optimization of the parameters (daily treatment capacity: 5CMD) was combined to treat high-concentration wastewater containing high concentrations of COD (14,700 mg/L) and boron (486 mg/L), with treatment efficiency approaching 100% within 20 min. As proved by the research results, after being treated by the new manganese-iron oxide catalytic support and activated carbon, the wastewater has reached the emission standard and can be discharged directly. This combined method provides a new way for the treatment of wastewater containing high concentrations of COD and boron.
Highlights
A self-built support, automation module and self-synthe being in combination with manganese-iron activated carbon underwent a reduction in the treatmentwere load so that its treatmenttreatment efficiency was forwastew manganese-iron support used foreffective the practical ofmaintained industrial to 180 days and its high treatment efficiency was restored after reproduction
To treat wastewater containing a high concentration of chemical oxygen demand (COD) and boron, this method is more convenient and easier to use compared with chemical precipitation, adsorption, and coagulation methods which require many cumbersome steps and longtime [32,33,34]
Over a review of the latest boron removal technologies based on catalytic oxidation and adsorption, it is confirmed that the technology proposed in this paper is applicable to the treatment of complex wastewater containing a high concentration of COD and boron
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Most of the wastewater containing high concentrations of COD and boron discharged into the environment by human activities is relevant to agricultural and industrial development. Chemical precipitation is a simple and cost-effective method [20,21] commonly used in industry to remove high-concentration pollutants in water. The Fenton reaction involves several reactions which can be described by Equations (1)–(6): Fe2+ + H2 O2 → ·OH + OH− + Fe3+ This method may cause precipitation which requires iron sludge, resulting in secondary pollution. To solve this problem, there have been extensive researches on the application of iron oxide as a catalyst in the oxidation of organic compounds. The material developed in this research can be used for the long term, without secondary pollution, which greatly improves the efficiency and convenience in the treatment of wastewater
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