Practice of integrated system of biofilter and constructed wetland in highly polluted surface water treatment

Zhaoqian Jing, Rui He, Yong Hu, Qigui Niu, Shiwei Cao, Yu You Li

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

To find an appropriate process for highly polluted surface water, an integrated system with a double-layer biofilter and a constructed wetland was developed. In the biofilter packed with carbon-rich ceramic granules, alternation of nitrification and denitrification was realized resulting in prominent TN (total nitrogen) removal. The constructed wetland was designed in subsurface flow mode with 0.15m depth filled with calcium-rich ceramic granules, which improved phosphorus removal greatly. COD (chemical oxygen demand), TN, NH4+-N and TP (total phosphorus) in the final effluent were mostly below 30, 15, 5 and 0.5mg/L, respectively. The overall phosphorus removal rate in the constructed wetland reached 158.9g/m2year, in which granules' interception and plants' uptake respectively contributed 74.7% and 25.3%. After one year's operation, the calcium content on the surface of the granules in the constructed wetland decreased obviously, whereas phosphorus content increased greatly.

Original languageEnglish
Pages (from-to)462-469
Number of pages8
JournalEcological Engineering
Volume75
DOIs
Publication statusPublished - 2015 Feb 1

Keywords

  • Biofilter
  • Ceramic granule
  • Constructed wetland
  • Denitrification
  • Phosphorus removal

ASJC Scopus subject areas

  • Environmental Engineering
  • Nature and Landscape Conservation
  • Management, Monitoring, Policy and Law

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