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Fe

Hankun Yang1, Lei Xu1, Yujuan Li2

  • 1State Key Laboratory of Environmental Aquatic Chemistry, Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.

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|June 9, 2023
PubMed
Summary
This summary is machine-generated.

A novel iron oxide modified activated carbon in a biological slow filtration reactor (BSFR) significantly improved refractory dissolved organic matter removal by 90%. This enhanced BSFR process also reduced disinfection byproduct formation in reused water treatment.

Keywords:
Biological slow filtrationDissolved organic matterFeNCIron oxidesReused water

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Materials Science

Background:

  • Biological slow filtration reactors (BSFRs) show moderate effectiveness in removing refractory dissolved organic matter (DOM) from reused water.
  • Conventional activated carbon (AC) in BSFRs has limitations in treating complex water matrices like landscape water mixed with landfill leachate.

Purpose of the Study:

  • To compare the performance of a novel iron oxide (FexO)/FeNC modified activated carbon (FexO@AC) packed BSFR against a conventional AC-BSFR.
  • To evaluate the efficiency of FexO@AC in removing refractory DOM and reducing disinfection byproduct formation.

Main Methods:

  • Bench-scale experiments using parallel operated BSFRs.
  • Feed water consisted of a mixture of landscape water and concentrated landfill leachate.
  • Comparison of FexO@AC-BSFR and AC-BSFR under identical hydraulic retention time (HRT) and temperature conditions for 30 weeks.

Main Results:

  • The FexO@AC-BSFR achieved a 90% refractory DOM removal rate at 10h HRT, significantly outperforming the AC-BSFR's 70% removal.
  • The FexO@AC-BSFR substantially reduced the formation potential of trihalomethanes and haloacetic acids.
  • FexO/FeNC modification enhanced AC media conductivity and oxygen reduction reaction (ORR) efficiency, accelerating anaerobic digestion.

Conclusions:

  • The FexO@AC-BSFR offers a superior solution for refractory DOM removal in reused water treatment.
  • The enhanced ORR and conductivity of FexO@AC facilitate anaerobic digestion, leading to improved water quality.
  • This novel material modification presents a promising advancement in wastewater treatment technologies.