Abstract
Chemical synthetic pharmaceutical wastewater has characteristics of high concentration, high toxicity and poor biodegradability, so it is difficult to directly biodegrade. We used acid modified attapulgite (ATP) supported Fe-Mn-Cu polymetallic oxide as catalyst for multi-phase Fenton-like ultraviolet photocatalytic oxidation (photo-Fenton) treatment with actual chemical synthetic pharmaceutical wastewater as the treatment object. The results showed that at the initial pH of 2.0, light distance of 20 cm, and catalyst dosage and hydrogen peroxide concentration of 10.0 g/L and 0.5 mol/L respectively, the COD removal rate of wastewater reached 65% and BOD5/COD increased to 0.387 when the reaction lasted for 180 min. The results of gas chromatography-mass spectrometry (GC-MS) indicated that Fenton-like reaction with Fe-Mn-Cu@ATP had good catalytic potential and significant synergistic effect, and could remove almost all heterocycle compounds well. 3D-EEM (3D electron microscope) fluorescence spectra showed that the fluorescence intensity decreased significantly during catalytic degradation, and the UV humus-like and fulvic acid were effectively removed. The degradation efficiency of the nanocomposite only decreased by 5.8% after repeated use for 6 cycles. It seems appropriate to use this process as a pre-treatment for actual pharmaceutical wastewater to facilitate further biological treatment.
Highlights
With the rapid development of the pharmaceutical industry, the scale of synthetic pharmaceutical production is expanding, resulting in a large increase in the amount of wastewater generated [1]
The public faces an environmental problem of complex pharmaceutical wastewater components, which causes them to worry about the ecological environmental damage [2]
Combined with the actual situation of chemical synthetic pharmaceutical wastewater, the type and characteristics of wastewater should be studied in depth, and wastewater treatment technology should be continuously improved to meet the development needs of the chemical synthetic pharmaceutical industry [4]
Summary
With the rapid development of the pharmaceutical industry, the scale of synthetic pharmaceutical production is expanding, resulting in a large increase in the amount of wastewater generated [1]. Due to its long production process and the low utilization rate of raw materials, the chemical composition of the wastewater is complex, with high concentration of organic matter, strong toxicity, poor biodegradability and great impact on biochemical treatment. The difficulty of chemical and pharmaceutical wastewater treatment lies in reducing pollutant concentration and improving biodegradability. Traditional treatment technologies, such as adsorption, coagulation and biological treatment, are mainly used, but there are some application problems, such as poor treatment efficiency, high cost, and easy to cause secondary pollution [5]. An economical, effective and eco-friendly technology is needed to mineralize these pollutants into substances that are non-toxic or less toxic
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