Mineral processing residue use as substrate in a modular engineered wetland for wastewater treatment

Zheng Yuan, Shasha Fu, Xinfa Xu, Laura Wendling

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Safeguarding the water quality of Poyang Lake, China's largest freshwater lake, is essential for long-term regional water resource sustainability. The use of locally-available mineral processing residues as reactive substrate in engineered wetlands may provide a cost-effective treatment alternative for mixed agricultural and domestic wastewaters entering Poyang Lake. In this study, Chinese iron- and steel-making slags and a titanium mineral processing residue with high nutrient removal capacity were identified in laboratory experiments. A pilot-scale modular wetland system consisting of free water surface, and vertical and horizontal subsurface flow units, all planted with locally-available vegetation, was constructed at the Poyang Lake Modelling Experiment and Research Base in Jiangxi Province. Assessment of nutrient removal efficiency and effluent water quality was undertaken to inform upscaling and optimization of the modular unit process wetland design. The pilot-scale wetland system removed 55% of inorganic N in influent wastewater and was particularly effective in P attenuation, removing 81% of total P. The environmentally-acceptable pH of wetland system effluents, along with low concentrations of dissolved metals and the absence of potential for either N- or Si-limitation, indicated that the modular wetland system examined was potentially suitable for treatment of mixed wastewater entering Poyang Lake. The use of the selected mineral processing residues as reactive substrate in engineered wetland systems enhanced pollutant removal processes in the modular engineered wetland system, effectively attenuating pollutants in mixed wastewater.
Original languageEnglish
Pages (from-to)523-547
Number of pages25
JournalEnvironmental Processes
Volume4
Issue number3
DOIs
Publication statusPublished - 1 Sep 2017
MoE publication typeA1 Journal article-refereed

Fingerprint

Ore treatment
Wetlands
mineral processing
Waste Water
Wastewater treatment
Minerals
wetland
Lakes
substrate
Substrates
Wastewater
lake
wastewater
Water Quality
Nutrients
Water quality
Effluents
effluent
Water Resources
water quality

Keywords

  • nitrogen
  • phosphorus
  • eutrophication
  • dissolved organic carbon
  • wastewater treatment
  • constructed wetland

Cite this

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title = "Mineral processing residue use as substrate in a modular engineered wetland for wastewater treatment",
abstract = "Safeguarding the water quality of Poyang Lake, China's largest freshwater lake, is essential for long-term regional water resource sustainability. The use of locally-available mineral processing residues as reactive substrate in engineered wetlands may provide a cost-effective treatment alternative for mixed agricultural and domestic wastewaters entering Poyang Lake. In this study, Chinese iron- and steel-making slags and a titanium mineral processing residue with high nutrient removal capacity were identified in laboratory experiments. A pilot-scale modular wetland system consisting of free water surface, and vertical and horizontal subsurface flow units, all planted with locally-available vegetation, was constructed at the Poyang Lake Modelling Experiment and Research Base in Jiangxi Province. Assessment of nutrient removal efficiency and effluent water quality was undertaken to inform upscaling and optimization of the modular unit process wetland design. The pilot-scale wetland system removed 55{\%} of inorganic N in influent wastewater and was particularly effective in P attenuation, removing 81{\%} of total P. The environmentally-acceptable pH of wetland system effluents, along with low concentrations of dissolved metals and the absence of potential for either N- or Si-limitation, indicated that the modular wetland system examined was potentially suitable for treatment of mixed wastewater entering Poyang Lake. The use of the selected mineral processing residues as reactive substrate in engineered wetland systems enhanced pollutant removal processes in the modular engineered wetland system, effectively attenuating pollutants in mixed wastewater.",
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Mineral processing residue use as substrate in a modular engineered wetland for wastewater treatment. / Yuan, Zheng; Fu, Shasha; Xu, Xinfa; Wendling, Laura.

In: Environmental Processes, Vol. 4, No. 3, 01.09.2017, p. 523-547.

Research output: Contribution to journalArticleScientificpeer-review

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