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J Korean Soc Environ Eng > Volume 41(9); 2019 > Article
J Korean Soc Environ Eng 2019;41(9): 483-493. doi: https://doi.org/10.4491/KSEE.2019.41.9.483
산성토양 개량을 위한 레드머드 및 바이오차의 적용과 이화학적 특성 연구
신동, 조영태, 박성재, 박정훈
전남대학교 환경에너지공학과
Acidic Soil Improvement and Physicochemical Characteristics Using Red-mud and Biochar
Dong Shin, Young-Tae Jo, Seong-Jae Park, Jeong-Hun Park
Department of Environment and Energy Engineering, Chonnam National University
Corresponding author  Jeong-Hun Park ,Tel: 062-530-1855, Fax: 062-530-1859, Email: parkjeo1@chonnam.ac.kr
Received: July 22, 2019;  Revised: September 3, 2019;  Accepted: September 9, 2019.  Published online: September 30, 2019.
ABSTRACT
Objectives:
Total waste that is generated in South Korea per land area is ranked in fourth among OECD countries. Therefore, the importance of resource circulation through waste recycling should be emphasized. Red mud, one of the industrial wastes, is a by-product of the aluminum smelting process and is generated about 30 million tons per year.
Method:
Red mud is high in iron content and has a red color and strong alkalinity. Rice husk, a by-product of agricultural production, can be made into biochar through pyrolysis process and it also has alkalinity. By using red mud and biochar as soil amendment, experiment was conducted. The purpose of the experiment is to improve the quality of the acidic soil and find the growth-characteristics (length, width, weight, dry weight) through pot experiment.
Results and Discussion:
The acid soil with a pH level of 4.84 was increased to pH 7.14 after adding the amendment. The CEC of the soil with 7.56 cmolc/kg was increased to 9.80 cmolc/kg. Pot experiment showed better results of growth-characteristics in treatment than control. The analysis of heavy metals showed below standard level in both control and treatment.
Conclusion:
Therefore, the pot experiment showed that red mud and biochar could be used to improve acid soil effectively.
Key Words: Red Mud, Biochar, Soil Improvement, Amendment, Acidic Soil
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