Abstract
waterborne coatings have become the development trend of the coating industry because of their less use of organic solvents and good environmental protection performance. However, the wastewater produced in the production process of waterborne coatings has become a difficult pollution source. Based on this, this paper uses coagulation sedimentation method and Fenton oxidation method to treat waterborne coating wastewater. Taking the COD of treated wastewater as the research index, this paper studies various factors affecting the treatment effect of coagulation sedimentation and Fenton oxidation. Through single factor analysis, the results show that the best dosage of PFS and PAM is PFS: 8 g/L and PAM: 0.8 g/L; In Fenton oxidation, the dosage of H2O2 is 9.98mL/L, the dosage of FeSO4 · 7H2O is n (Fe2+): n (H2O2) = 1:6, pH is 2, and the dosage times are 2.
Highlights
The water-based coating takes water as the dispersion medium
Taking the waterborne coating wastewater produced by a waterborne coating production company in Guangdong as the research object, this paper discusses the treatment conditions of waterborne coating wastewater by coagulation sedimentation method and Fenton oxidation method
Take several 100 mLwater samples into the beaker, add 8 g/L PFS and 0.6 g/L PAM respectively for coagulation test, and conduct the experiment by selecting the stirring strategy of fast stirring for 1 min and slow stirring for 1.5 min, and set the sedimentation time as 1h. 2.3 Fenton oxidation method H2O2 dosage, FeSO4ꞏ7H2O dosage, pH value and dosing times are selected as the control conditions
Summary
The water-based coating takes water as the dispersion medium. During the construction and subsequent drying process, the water volatilizes and returns to nature in a gas state, which will not harm the human body and the environment. In the production process, waterbased coatings will produce a large amount of wastewater with high chroma, turbidity and COD content [3,4]. The washing solution of batching tank is the wastewater after the dilution of the original coating sample solution, so its chroma, turbidity and COD content are large. At present, aiming at the basically known pollution sources and types of water-based coating wastewater, the methods for treating this kind of organic wastewater at home and abroad mainly include incineration method, coagulation sedimentation method, chemical oxidation method, electrolysis method, biological method and combined method [6]. Taking the waterborne coating wastewater produced by a waterborne coating production company in Guangdong as the research object, this paper discusses the treatment conditions of waterborne coating wastewater by coagulation sedimentation method and Fenton oxidation method. Taking the COD removal rate as the screening index, various factors were compared and analyzed and the optimization conditions were studied
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