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摘要
Compared with Fenton advanced oxidation process for pulping and papermaking wastewater treatment, the PS acid-free advanced oxidation process has many advantages of stable reagents, no need to adjust initial pH and so on. Based on the operation data of PS acid-free advanced oxidation process treating the biochemical effluent from a pulp and paper factory, the relationships between the dosage of the chemicals (sodium persulfate, ferrous sulfate, sodium hydroxide and polyaluminium chloride) and water flow, influent load and COD removal amount were systematically analyzed. Continuous running data showed that the average COD of influent was 116 mg·L?1, while the average COD of effluent was 47 mg·L?1 which was stable below 60 mg·L?1. The average dosages of sodium persulfate, ferrous sulfate, sodium hydroxide and polyaluminum chloride were 0.06, 0.12, 0.09 and 0.095 kg·m?3 (as unit volume of wastewater), respectively. Besides, the molar ratio of ferrous sulfate to sodium persulfate was mainly between 2.0 and 3.0. The characteristics of dissolved organic matter (DOM) were characterized by fingerprinting methods such as UV-vis spectroscopy, three-dimensional fluorescence and GC-MS. The results showed that the proportions of substances with medium and small molecular weights in DOM increased. Persistent aromatic pollutants and humic acids were effectively degraded during the treatment. The water quality was greatly improved after the advanced treatment. With the reduced operating costs and simplified operation process, the PS acid-free advanced oxidation process can ensure that the effluent meets the discharge requirements. The systematic process analysis of PS acid-free advanced oxidation technology could provide technical support and theoretical reference for the application of advanced oxidation technology in wastewater treatment. ? 2021, Editorial Department of JCEE. All right reserved.
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