EFFECTS OF DIFFERENT DOSING METHODS OF SLOW-RELEASE OXYGEN COMPOSITE MATERIALS ON THE MIGRATION OF POLLUTANTS AT THE SEDIMENT-WATER INTERFACE

GUO Peng-fei; DONG Zi-yi; WANG Ying; FU Jun; WANG Jing-gang; LIU Xian-jing

doi:10.13205/j.hjgc.202105001

Volume 39 Issue 5

Jan. 2022

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GUO Peng-fei, DONG Zi-yi, WANG Ying, FU Jun, WANG Jing-gang, LIU Xian-jing. EFFECTS OF DIFFERENT DOSING METHODS OF SLOW-RELEASE OXYGEN COMPOSITE MATERIALS ON THE MIGRATION OF POLLUTANTS AT THE SEDIMENT-WATER INTERFACE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 1-8. doi: 10.13205/j.hjgc.202105001

Citation:

GUO Peng-fei, DONG Zi-yi, WANG Ying, FU Jun, WANG Jing-gang, LIU Xian-jing. EFFECTS OF DIFFERENT DOSING METHODS OF SLOW-RELEASE OXYGEN COMPOSITE MATERIALS ON THE MIGRATION OF POLLUTANTS AT THE SEDIMENT-WATER INTERFACE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 1-8. doi: 10.13205/j.hjgc.202105001

Citation:

GUO Peng-fei, DONG Zi-yi, WANG Ying, FU Jun, WANG Jing-gang, LIU Xian-jing. EFFECTS OF DIFFERENT DOSING METHODS OF SLOW-RELEASE OXYGEN COMPOSITE MATERIALS ON THE MIGRATION OF POLLUTANTS AT THE SEDIMENT-WATER INTERFACE[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 1-8. doi: 10.13205/j.hjgc.202105001

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EFFECTS OF DIFFERENT DOSING METHODS OF SLOW-RELEASE OXYGEN COMPOSITE MATERIALS ON THE MIGRATION OF POLLUTANTS AT THE SEDIMENT-WATER INTERFACE

doi: 10.13205/j.hjgc.202105001

1. College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. College of Environment, Beijing Normal University, Beijing 100048, China;
3. Sino-Japan Friendship Centre for Environmental Protection, Beijing 100029, China

Received Date: 2020-07-24
Available Online: 2022-01-17

Abstract

Abstract

In order to improve the lake sediment-water interface habitat, a slow-release oxygen material that can supply oxygen in situ and reduce the release of endogenous nitrogen was developed. The slow-release oxygen material prepared with CaO₂:white clay:cement=2:1:1 (mass ratio) had good oxygen release and pH buffering capability. The simulation experiment compared the effects of different dosing methods of slow-release oxygen materials (surface dosing and in-mud dosing) on the release of oxygen and the release of pollutants in the sediments. The results showed that:1) the DO concentration and pH value of the overlying water were significantly increased by surface dosing, and in-mud dosing could maintain the pH value within 7.5, while the DO concentration increased slowly, prolonging the oxygen release period; 2) slow-release oxygen materials had a significant inhibitory effect on release of NH₄⁺-N in the sediment, and surface dosing was significantly effective than in-mud dosing. Taking the blank group as the reference, after 31 days of static culture, the inhibition rate of NH₄⁺-N by adding slow-release oxygen material into the mud was 53.4%, and that of the surface dosing was 81.1%. Adding oxygen-releasing materials increased the level of DO in the overlying water and promoted the growth of nitrifying bacteria, thereby inhibiting the release of NH₄⁺-N; 3) slow-release oxygen materials were beneficial to microorganisms growth which promoted the humification of microorganisms, thereby slightly promoted the release of terrestrial-like humic acids in the sediments, while slightly inhibited the release of tyrosine-like proteins; 4) slow-release oxygen materials could promote the conversion of Fe/Al-P to Ca-P in the sediment which slightly inhibited the release of DIP, but the release of DOC and arsenic and chromium in the sediment increased slightly, due to the increase of pH.
- oxygen release material,
- oxygen profile,
- nitrogen and phosphorus release,
- DOM,
- heavy metals,
- graded phosphorus

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References(26)

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