Engineering application of pulping and papermaking wastewater advanced treatment by PS acid-free advanced oxidation process
YANG Shou1,, WAN Jinquan1,2,3,,, MA Yongwen1,2, WANG Yan1,2, WAN Yongjie1, YE Gang3 1.College of Environment and Energy, South China University of Technology, Guangzhou 510006, China 2.Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, Guangzhou 510641, China 3.Sino-Singapore International Joint Research Institute, Guangzhou 510006, China
Abstract: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. Key words:pulping and papermaking wastewater/ PS acid-free advanced oxidation process/ advanced treatment/ dissolved organic matters.
图1制浆造纸废水处理流程图 Figure1.Flow chart of pulping and papermaking wastewater treatment
图7PS无酸高级氧化工艺紫外光谱及DOM分子质量所占比例分析 Figure7.Analysis of the proportion of UV spectra and molecular weight during the PS acid-free advanced oxidation process
TOCZY?OWSKA-MAMI?SKA R. Limits and perspectives of pulp and paper industry wastewater treatment: A review[J]. Renewable and Sustainable Energy Reviews, 2017, 78: 764-772. doi: 10.1016/j.rser.2017.05.021
[2]
CHANDRA R, SINGH R. Decolourisation and detoxification of rayon grade pulp paper mill effluent by mixed bacterial culture isolated from pulp paper mill effluent polluted site[J]. Biochemical Engineering Journal, 2012, 61: 49-58. doi: 10.1016/j.bej.2011.12.004
[3]
SINGH A K, CHANDRA R. Pollutants released from the pulp paper industry: Aquatic toxicity and their health hazards[J]. Aquatic Toxicology, 2019, 211: 202-216. doi: 10.1016/j.aquatox.2019.04.007
[4]
KAMALI M, GAMEIRO T, COSTA M E V, et al. Anaerobic digestion of pulp and paper mill wastes: An overview of the developments and improvement opportunities[J]. Chemical Engineering Journal, 2016, 298: 162-182. doi: 10.1016/j.cej.2016.03.119
[5]
KLIDI N, PROIETTO F, VICARI F, et al. Electrochemical treatment of paper mill wastewater by electro-Fenton process[J]. Journal of Electroanalytical Chemistry, 2019, 841: 166-171. doi: 10.1016/j.jelechem.2019.04.022
[6]
WAC?AWEK S, LUTZE H V, GRüBEL K, et al. Chemistry of persulfates in water and wastewater treatment: A review[J]. Chemical Engineering Journal, 2017, 330: 44-62. doi: 10.1016/j.cej.2017.07.132
GHANBARI F, MORADI M. Application of peroxymonosulfate and its activation methods for degradation of environmental organic pollutants: Review[J]. Chemical Engineering Journal, 2017, 310: 41-62. doi: 10.1016/j.cej.2016.10.064
[9]
CHI H, WAN J, MA Y, et al. Ferrous metal-organic frameworks with stronger coordinatively unsaturated metal sites for persulfate activation to effectively degrade dibutyl phthalate in wastewater[J]. Journal of Hazardous Materials, 2019, 377: 163-171. doi: 10.1016/j.jhazmat.2019.05.081
[10]
MAZHAR S, DITTA A, BULGARIU L, et al. Sequential treatment of paper and pulp industrial wastewater: Prediction of water quality parameters by Mamdani fuzzy logic model and phytotoxicity assessment[J]. Chemosphere, 2019, 227: 256-268. doi: 10.1016/j.chemosphere.2019.04.022
LUO T, WAN J, MA Y, et al. Sulfamethoxazole degradation by an Fe(Ⅱ)-activated persulfate process: insight into the reactive sites, product identification and degradation pathways[J]. Environmental Science: Processes & Impacts, 2019, 21: 1560-1569.
[13]
MOSADDEGHI M R, SHARIATI F P, YAZDI S A V, et al. Application of response surface methodology (RSM) for optimizing coagulation process of paper recycling wastewater using Ocimum basilicum[J]. Environmental Technology, 2018, 41: 100-108.
WEISHAAR J L, AIKEN G R, BERGAMASCHI B A, et al. Evaluation of specific ultraviolet absorbance as an indicator of the chemical composition and reactivity of dissolved organic carbon[J]. Environmental Science & Technology, 2003, 37(20): 4702-4708.
[16]
WANG K, LI W, GONG X, et al. Spectral study of dissolved organic matter in biosolid during the composting process using inorganic bulking agent: UV-vis, GPC, FTIR and EEM[J]. International Biodeterioration & Biodegradation, 2013, 85: 617-623.
[17]
NI B, FANG F, XIE W, et al. Characterization of extracellular polymeric substances produced by mixed microorganisms in activated sludge with gel-permeating chromatography, excitation-emission matrix fluorescence spectroscopy measurement and kinetic modeling[J]. Water Research, 2009, 43(5): 1350-1358. doi: 10.1016/j.watres.2008.12.004
[18]
HE M, SHI Y, LIN C. Characterization of humic acids extracted from the sediments of the various rivers and lakes in China[J]. Journal of Environmental Sciences, 2008, 20(11): 1294-1299. doi: 10.1016/S1001-0742(08)62224-X
COBLE P G. Characterization of marine and terrestrial DOM in seawater using excitation-emission matrix spectroscopy[J]. Marine Chemistry, 1996, 51(4): 325-346. doi: 10.1016/0304-4203(95)00062-3
1.College of Environment and Energy, South China University of Technology, Guangzhou 510006, China 2.Guangdong Plant Fiber High-Valued Cleaning Utilization Engineering Technology Research Center, Guangzhou 510641, China 3.Sino-Singapore International Joint Research Institute, Guangzhou 510006, China Received Date: 2020-02-20 Accepted Date: 2020-05-06 Available Online: 2021-01-13 Keywords:pulping and papermaking wastewater/ PS acid-free advanced oxidation process/ advanced treatment/ dissolved organic matters Abstract: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.