4.6 Article

Synergistic Effects of Calcium Peroxide and Fe3O4@BC Composites on AVS Removal, Phosphorus and Chromium Release in Sediments

Journal

WATER
Volume 14, Issue 10, Pages -

Publisher

MDPI
DOI: 10.3390/w14101626

Keywords

black odorous sediment; Fe3O4@BC composites; calcium peroxide; pollutant; microorganisms

Funding

  1. Major Scientific and Technological Special Program of Sichuan Province, China [2018SZDZX0027]
  2. Key Research and Development Program of Sichuan Province, China [2019-YF09-00081-SN]
  3. Strategic Cooperation Project of Sichuan University [2020CDLZ-6]
  4. Strategic Cooperation Project of Luzhou City, Sichuan Province, China [2020CDLZ-6]

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The study successfully treated urban sediment pollution by preparing Fe3O4@BC composites and using CP. The method showed significant effects in removing AVS, phosphorus, and heavy metal pollution, while also promoting the growth of beneficial microorganisms and inhibiting the proliferation of harmful ones.
Black odorous sediment pollution in urban areas has received widespread attention, especially pollution caused by acidified volatile sulfide (AVS), phosphorus and heavy metals. In this study, an Fe3O4@BC composite was fabricated by the coprecipitate method of Fe3O4 and biochar (BC) and was mixed with calcium peroxide (CP) for sediment pollution treatment. The results showed that the AVS removal rate could reach 52.8% in the CP+Fe3O4@BC system and -18.1% in the control group on the 25th day. AVS was removed in the following three ways: AVS could be oxidized with oxygen produced by CP; H2O2 produced from CP also could be activated by Fe2+ to generate hydroxyl radicals that have strong oxidation properties to oxidize AVS; AVS could also be removed by bacterial denitrification. As for phosphorus, total phosphorus (TP) content in overlying water remained at 0.1 mg/L after CP and Fe3O4@BC were added. This is due to the conversion of NH4Cl-P and Fe/Al-P into Ca-P in sediments, which inhibited the release of phosphorus. Simultaneously, the release and migration of heavy metal chromium (Cr) were slowed, as demonstrated by the results (the acid extractable and reducible states of Cr in the sediment decreased to 0.58% and 0.97%, respectively). In addition, the results of the high-throughput genetic test showed the total number of microorganisms greatly increased in the CP+Fe3O4@BC group. The abundance of Sulfurovum increased while that of sulphate-reducing bacteria (SRBs) was inhibited. Furthermore, the abundance of denitrifying bacteria (Dechlorominas, Acinetobacter and Flavobacterium) was increased. In brief, our study showed the synergistic effect of Fe3O4@BC composites and CP had a remarkable effect on the urban sediment treatment, which provides a new way to remove sediment pollution.

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