Hydrolyzed polyacrylamide-containing wastewater treatment using ozone reactor-upflow anaerobic sludge blanket reactor-aerobic biofilm reactor multistage treatment system

Tianwen Song; Shanshan Li; Zichao Yin; Mutai Bao; Jinren Lu; Yang Li

doi:10.1016/j.envpol.2020.116111

Hydrolyzed polyacrylamide-containing wastewater treatment using ozone reactor-upflow anaerobic sludge blanket reactor-aerobic biofilm reactor multistage treatment system

Environ Pollut. 2021 Jan 15:269:116111. doi: 10.1016/j.envpol.2020.116111. Epub 2020 Nov 21.

Authors

Tianwen Song¹, Shanshan Li², Zichao Yin², Mutai Bao³, Jinren Lu⁴, Yang Li⁵

Affiliations

¹ Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, China; College of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao, 266033, China.
² Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
³ Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, China. Electronic address: mtbao@ouc.edu.cn.
⁴ College of Chemistry & Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
⁵ Frontiers Science Center for Deep Ocean Multispheres and Earth System, And Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; China Petrochemical Corporation (Sinopec Group), Beijing, 100728, China.

PMID: 33290953
DOI: 10.1016/j.envpol.2020.116111

Abstract

Polymer flooding is one of the most important enhanced oil recovery techniques. However, a large amount of hydrolyzed polyacrylamide (HPAM)-containing wastewater is produced in the process of polymer flooding, and this poses a potential threat to the environment. In this study, the treatment of HPAM-containing wastewater was analyzed in an ozonic-anaerobic-aerobic multistage treatment process involving an ozone reactor (OR), an upflow anaerobic sludge blanket reactor (UASBR), and an aerobic biofilm reactor (ABR). At an HPAM concentration of 500 mg L^-1 and an ozone dose of 25 g O₃/g TOC, the HPAM removal rate reached 85.06%. With fracturing of the carbon chain, high-molecular-weight HPAM was degraded into low-molecular-weight compounds. Microbial communities in bioreactors were investigated via high-throughput sequencing, which revealed that norank_c_Bacteroidetes_vadinHA17, norank_f_Cytophagaceae, and Meiothermus were the dominant bacterial groups, and that Methanobacterium, norank_c_WCHA1-57, and Methanosaeta were the key archaeal genera. To the best of our knowledge, this is the first study in which HPAM-containing wastewater is treated using an ozonic-anaerobic-aerobic multistage treatment system. The ideal degradation performance and the presence of keystone microorganisms confirmed that the multistage treatment process is feasible for treatment of HPAM-containing wastewater.

Keywords: Biodegradation; Functional enzyme; Functional microorganism; Hydrolyzed polyacrylamide; Ozonation.

MeSH terms

Acrylic Resins
Anaerobiosis
Biodegradation, Environmental
Biofilms
Bioreactors
Ozone*
Sewage
Waste Disposal, Fluid
Wastewater
Water Purification*

Substances

Acrylic Resins
Sewage
Waste Water
Ozone
polyacrylamide