DIVERSITY OF IRON MINERALS AND THEIR ADSORPTION TO Cd IN FERROUS OXIDATION AND DENITRIFICATION BIOFILM REACTOR

SU Chang; LI Ying-fen; YAN Xing; CHONG Yun-xiao

doi:10.13205/j.hjgc.202005014

Volume 38 Issue 5

Aug. 2020

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SU Chang, LI Ying-fen, YAN Xing, CHONG Yun-xiao. DIVERSITY OF IRON MINERALS AND THEIR ADSORPTION TO Cd IN FERROUS OXIDATION AND DENITRIFICATION BIOFILM REACTOR[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(5): 76-83. doi: 10.13205/j.hjgc.202005014

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SU Chang, LI Ying-fen, YAN Xing, CHONG Yun-xiao. DIVERSITY OF IRON MINERALS AND THEIR ADSORPTION TO Cd IN FERROUS OXIDATION AND DENITRIFICATION BIOFILM REACTOR[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(5): 76-83. doi: 10.13205/j.hjgc.202005014

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DIVERSITY OF IRON MINERALS AND THEIR ADSORPTION TO Cd IN FERROUS OXIDATION AND DENITRIFICATION BIOFILM REACTOR

doi: 10.13205/j.hjgc.202005014

1. College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China;
2. Jiangmen City Ecological Environment Bureau, Jiangmen 529000, China;
3. Guangzhou Water Purification Company Limited, Guangzhou 510627, China

Received Date: 2019-06-03

Abstract

Abstract

Nitrate-dependent anaerobic ferrous iron oxidation refers to the biomineralization process coupled with ferrous oxidation and nitrate nitrogen reduction, which not only has the effect of denitrification on sewage, but also can obtain a series of iron minerals with strong adsorption and removal ability for multi pollutants. In this study, we constructed a continuous flow biofilm reactor based on this process for wastewater denitrification treatment, and analyzed the characteristics of particulate matters generated internally after three months of operation and their adsorption effect on cadmium (Cd). The results showed that the granules in different positions of the reactor contain different iron minerals, the bottom and middle particles were dominated by siderite, and the top particles were dominated by goethite. These particles had a large specific surface area and a variety of organic functional groups for adsorption, and strong adsorption capacity for Cd²⁺ in water. The adsorption removal rate of different positions of the reactor was in sequence of effluent>top>middle>bottom, all above 84%. The kinetic and thermodynamic equations complied well with the pseudo second-order model and Freundlich isotherms model, respectively.
- nitrate-dependent anaerobic ferrous iron oxidation,
- iron mineral,
- continuous flow,
- cadmium,
- adsorption characteristics

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References(43)

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