Development of methodology for the optimal operation of soil aquifer treatment systems

Zongwu Tang, Guihua Li, Larry Mays, Peter Fox

Research output: Contribution to journalConference article

11 Scopus citations

Abstract

Soil aquifer treatment (SAT) systems are used for reclamation of sewage effluent by groundwater recharge. Increasing demand on water supplies has stimulated the production or planning of many SAT systems that will use reclaimed wastewater for groundwater recharge. These systems are comprised of a series of infiltration basins. The design and operation of soil aquifer treatment systems presently relies primarily upon judgment and experience. This research effort is developing a methodology for determining the optimal operation of SAT systems that is based upon mathematically describing the problem as a discrete-time optimal control problem. The resulting mathematical problem is a large-scale nonlinear programming problem. Solution of the problem is being accomplished by interfacing a nonlinear programming optimizer, which is solved by a differential dynamic programming algorithm, with a simulator that describes the infiltration process, unsaturated flow, effects of surface clogging and biological clogging, biological removal of nitrogen and organics. Major efforts are devoted to numerical performance of the optimization model solution, and development of the simulator. Initial results of interfacing the optimizer with the simulator without water quality concern show high convergence rate. The operation pattern determined by this method is reasonable. This new methodology will be a tool for engineers to evaluate choices regarding the potential of the design and operation of SAT systems.

Original languageEnglish (US)
Pages (from-to)433-442
Number of pages10
JournalWater Science and Technology
Volume33
Issue number10-11
DOIs
StatePublished - Jan 1 1996
EventProceedings of the 1995 IAWQ 2nd International Symposium on Wastewater Reclamation and Reuse - Iraklio, Greece
Duration: Oct 17 1995Oct 20 1995

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Keywords

  • Clogging
  • Differential dynamic programming
  • Infiltration
  • Nitrogen removal
  • Optimization
  • Organics removal
  • Simulation
  • Soil aquifer treatment system
  • Unsaturated flow

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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