Performance of double-layer biofilter packed with coal fly ash ceramic granules in treating highly polluted river water

Zhaoqian Jing, Yu You Li, Shiwei Cao, Yuyu Liu

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

To improve trickling filters' denitrification efficiency, a biofilter with a trickling upper layer and a submerged lower layer was developed and applied in treating highly polluted river water. It was packed with porous coal fly ash ceramic granules. Its start-up characteristics, influence of hydraulic loading rates (HLR), carbon/nitrogen (C/N) ratio and filter depth on pollutants removal were investigated. The results indicated this biofilter was started quickly in 16days with river sediment as inoculum. Alternating nitrification and denitrification were achieved when water flowed downwards. COD and nitrogen were mainly removed in the upper layer and the lower layer, respectively. With HLR of 4.0-5.0m3/(m2d), chemical oxygen demand (COD), ammonium (NH4+-N) and total nitrogen (TN) in the effluent were below 50, 5 and 15mg/L, respectively. This biofilter removed more than 80% of COD, 85% of NH4+-N and 60% of TN with C/N ratios ranging from 6 to 10.

Original languageEnglish
Pages (from-to)212-217
Number of pages6
JournalBioresource Technology
Volume120
DOIs
Publication statusPublished - 2012 Sep 1

Keywords

  • Biofilter
  • Ceramic granule
  • Coal fly ash
  • Denitrification
  • Double-layer

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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