TY - JOUR
T1 - Rare earth real wastewater treatment by pilot scale using new concept continuous treatment process
AU - Lee, Yonghyeon
AU - Ren, Yangmin
AU - Cui, Mingcan
AU - Ma, Junjun
AU - Han, Zhengchang
AU - Kwon, Ohhun
AU - Ko, Juin
AU - Khim, Jeehyeong
N1 - Funding Information:
This work was supported by the Korean Mine Reclamation Corporation (MIREC) project (Q 2010111 ) and Korean Ministry of the Environment as a Subsurface Environment Management (SEM) project (N0 2019002480001 ) and the Nanjing Science and Technology Program - International Co-operation in Industrial Technology Research and Development (NSTP) project (No. 201911003 ).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/9
Y1 - 2021/9
N2 - Rare earth (RE) containing radioactive species and a variety of toxic pollutants The treatment of real wastewater is very important for environmental protection. In this study, a new concept of continuous process consisting of precipitation, adsorption, and oxidation was developed without the use of chemicals. In the sedimentation step, waste oyster shell(WOS) and a PE tube diffuser(PE250) containing Na2S (PECa/S), PECa/S were prepared, which were used to precipitate heavy metals with a removal efficiency of 97% or more. In the adsorption step, fluorine (F), arsenic (As), and thorium (Th) were precipitated and removed when heavy metals were removed using coal mine drainage sludge (CMDS) and an adsorbent (PUCMDS) made of polyurethane (PU). Running a semi and pilot scale continuous process using PECa/S, PUCMDS and O3/HC systems resulted in a semi and pilot scale operating period of 120 and 62 days, and 60.26, 797.84, 46.94, 78.62 g, and 7.120 kg and 266.35, 42556.8, 191.95, 3108.43 g and 629.84 kg for As, F, Th, Pb and CODcr has been removed respectively. In addition, the removal efficiencies of As, F, Th, Pb and CODcr were 99.75, 99.98, 93.60, 99.99, and 88.82%, respectively, when treating real RE wastewater using the pilot scale system. Without the use of agitated reactors and regulators, the new concept of continuous process can effectively treat RE real wastewater, and the quality of the process outlet has met the pollutant limits recommended by EPA and China for irrigation.
AB - Rare earth (RE) containing radioactive species and a variety of toxic pollutants The treatment of real wastewater is very important for environmental protection. In this study, a new concept of continuous process consisting of precipitation, adsorption, and oxidation was developed without the use of chemicals. In the sedimentation step, waste oyster shell(WOS) and a PE tube diffuser(PE250) containing Na2S (PECa/S), PECa/S were prepared, which were used to precipitate heavy metals with a removal efficiency of 97% or more. In the adsorption step, fluorine (F), arsenic (As), and thorium (Th) were precipitated and removed when heavy metals were removed using coal mine drainage sludge (CMDS) and an adsorbent (PUCMDS) made of polyurethane (PU). Running a semi and pilot scale continuous process using PECa/S, PUCMDS and O3/HC systems resulted in a semi and pilot scale operating period of 120 and 62 days, and 60.26, 797.84, 46.94, 78.62 g, and 7.120 kg and 266.35, 42556.8, 191.95, 3108.43 g and 629.84 kg for As, F, Th, Pb and CODcr has been removed respectively. In addition, the removal efficiencies of As, F, Th, Pb and CODcr were 99.75, 99.98, 93.60, 99.99, and 88.82%, respectively, when treating real RE wastewater using the pilot scale system. Without the use of agitated reactors and regulators, the new concept of continuous process can effectively treat RE real wastewater, and the quality of the process outlet has met the pollutant limits recommended by EPA and China for irrigation.
KW - Heavy metal
KW - Organic compounds
KW - Ozone and hydrodynamic cavitation oxidation
KW - Precipitation and adsorption
KW - Radioactive
KW - Rare earth wastewater
UR - http://www.scopus.com/inward/record.url?scp=85104062106&partnerID=8YFLogxK
U2 - 10.1016/j.chemosphere.2021.130523
DO - 10.1016/j.chemosphere.2021.130523
M3 - Article
AN - SCOPUS:85104062106
VL - 279
JO - Chemosphere
JF - Chemosphere
SN - 0045-6535
M1 - 130523
ER -