Photo-catalytic reactor and detention pond integration: a novel technique for surface water quality enhancement via nano-TiO2

Xiaobing Chen, Saeed Rad, Gan Lei, Dai Junfeng, Asfandyar Shahab, Shaohong You, Kaihua Bai, Mohd Raihan Taha

Research output: Contribution to journalArticle

Abstract

Integration possibility and performance of a fixed-bed photo-catalytic reactor, merged with a detention pond, were examined at scale model. The focus of this study is to overcome the key issues of the conventional detention ponds and provide an enhanced surface water quality via nano-TiO2 as a novel hybrid technology. Photo-degradation of detained water nutrients in newly designed fixed-bed reactor pond (FRP) was studied to observe the impacts of heterogeneous reactions under ultraviolet irradiation. Immobilization of nano-titanium dioxide as catalyst, covering the FRP internal surface, was practiced for comparison and control. Rutile with anatase forms of TiO2 nano-powder (P25) was replaced in cement (white cement as well as Portland) at three dosages (30, 10, and 3%) for optimization purpose. Biodegradable pollutant elimination capability of FRP underpinned by the results for lower nitrate (16%), orthophosphate (25%), and COD (18%) in 2 days retention time, comparatively. Within 21 days, detaining time 26%, 58%. and 47% higher elimination was achieved, respectively. Improved catalyst surface area to reactor volume as well as an optimized retention time, based on streamflow pollution level, were achieved via splitting the FRP into two parts using a divider. FRP inlet was equipped with a flow switcher to capture and detain the first flush from the stormwater separately, while the balance is directed to the second part with a different required holding period. The divider walls were coated with cement-based nano-TiO2 and it also retrofitted applying filter media inside, for sediment-bound pollutant omission which the technique emerged with a greater TSS removal potency of up to 43%.

Original languageEnglish
Article number568
JournalEnvironmental Earth Sciences
Volume78
Issue number18
DOIs
Publication statusPublished - 1 Sep 2019

Fingerprint

Ponds
Surface waters
Water quality
surface water
water quality
pond
cement
catalysts
Titanium dioxide
methodology
Cements
pollutants
catalyst
titanium dioxide
biodegradability
Catalysts
stormwater
anatase
photolysis
orthophosphates

Keywords

  • First flush
  • Heterogeneous photo-catalytic
  • Nano-titanium dioxide
  • Quality enhancement
  • Reactor
  • Surface water
  • Wet detention pond

ASJC Scopus subject areas

  • Global and Planetary Change
  • Environmental Chemistry
  • Water Science and Technology
  • Soil Science
  • Pollution
  • Geology
  • Earth-Surface Processes

Cite this

Photo-catalytic reactor and detention pond integration : a novel technique for surface water quality enhancement via nano-TiO2. / Chen, Xiaobing; Rad, Saeed; Lei, Gan; Junfeng, Dai; Shahab, Asfandyar; You, Shaohong; Bai, Kaihua; Taha, Mohd Raihan.

In: Environmental Earth Sciences, Vol. 78, No. 18, 568, 01.09.2019.

Research output: Contribution to journalArticle

Chen, Xiaobing ; Rad, Saeed ; Lei, Gan ; Junfeng, Dai ; Shahab, Asfandyar ; You, Shaohong ; Bai, Kaihua ; Taha, Mohd Raihan. / Photo-catalytic reactor and detention pond integration : a novel technique for surface water quality enhancement via nano-TiO2. In: Environmental Earth Sciences. 2019 ; Vol. 78, No. 18.
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