Low temperature process to recover impaired waters

Veera Gnaneswar Gude, Nagamany Nirmalakhandan, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


A low temperature process based on physical principles of gravity and barometric head was developed for efficient recovery of potable water from impaired waters. An example of impaired water demonstrated in this study is secondary effluent from the local wastewater treatment plant. This paper illustrates two different configurations by which impaired waters could be processed; one using direct solar energy; and another using a low grade heat source. These configurations demonstrate the feasibility of utilizing renewable energy sources and waste process heat to drive the water recovery process making it an environment-friendly and cleaner approach. Experimental studies showed that the process was able to achieve the following reductions of key water quality parameters: total dissolved solids from 935 mg/L to 18 mg/L (>98%); total suspended solids from 5.1 mg/L to 0.15 mg/L (>97%); nitrates from 2.4 mg/L to < 0.1 mg/L (>95%); ammonia from 26.1 mg/L to < 0.5 mg/L (>98%); and coliform from 77 to ~0 mg/L (100%). The effect of process parameters such as heat source temperature, flow rate, and evaporation temperatures on the process performance is presented.

Original languageEnglish (US)
Pages (from-to)281-290
Number of pages10
JournalDesalination and Water Treatment
Issue number1-3
StatePublished - Aug 2010
Externally publishedYes


  • Desalination
  • Effluent
  • Impaired waters
  • Low temperature process
  • Wastewater
  • Water treatment

ASJC Scopus subject areas

  • Water Science and Technology
  • Ocean Engineering
  • Pollution


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