An anoxic/oxic submerged constructed wetlands process for wastewater treatment: Modeling, simulation and evaluation

Wei Kang Qi, Yi Ling Guo, Lin Meng Su, Michael Norton, Yu Qin, Yu You Li

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

An innovative anoxic/oxic (A/O) constructed wetlands (CWs) system was applied to remove the nutrient substrate in wastewater, and mathematical modeling for organic degradation, nitrification and denitrification in this system was then developed. A sensitivity analysis was performed for the parameters and operating conditions, and found that the treatment efficiency is affected by the organic loading rate, temperature, and recycling rate. Furthermore, actual measurements were used for calibration of the model. Its parameters were determined by fitting experimental data under various conditions, and the predictions of the simulation correlate well with the experimental observations. These model and simulation techniques were applied to evaluate and design the A/O wetland system. The results indicate that the removal rates of COD and nitrogen are above 95% and 50%, respectively. The flow rate does not affect the removal rate of the substrates, and a higher influent COD or lower ammonia concentration results in a better efficiency in the purification rate. The nitrogen removal rate could be improved by optimizing the interaction between the recycle rate and the influent ammonia.

Original languageEnglish
Pages (from-to)206-215
Number of pages10
JournalEcological Engineering
Volume67
DOIs
Publication statusPublished - 2014 Jun

Keywords

  • Anoxic-aerobic
  • Constructed wetland
  • Model
  • Simulation

ASJC Scopus subject areas

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

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