Document Detail

Feed-forward dose control of wastewater chlorination using on-line pH and ORP titration.
MedLine Citation:
PMID:  15268964     Owner:  NLM     Status:  MEDLINE    
In this study, a simple automatic pH-ORP titration device was developed for identifying the various ammonia concentrations and chlorine dose requirements for wastewater chlorination by identifying the peaks in the ORP-slope profiles and knees/valleys in the pH profiles. In addition, breakpoint chlorination experiments have shown that the ORP values at the monochloramine humps and breakpoints are linearly correlated with the ammonia concentrations. Therefore, a feed-forward control strategy, based on the chlorine/ammonia weight ratio (Cl/N), is proposed in this paper, to control the chlorine doses for a continuous wastewater chlorination experiment in a laboratory-scale reactor. The result of this continuous wastewater chlorination experiment has shown that the pH-ORP titration was able to precisely determine the variations of ammonia concentrations in the chlorination influent. Under this control strategy, effective and stable disinfection efficiencies in terms of total coliform count were obtained.
Ruey-Fang Yu
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chemosphere     Volume:  56     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2004 Sep 
Date Detail:
Created Date:  2004-07-22     Completed Date:  2004-11-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  973-80     Citation Subset:  IM    
Department of Safety, Health and Environmental Engineering, National United University, Miao-Li 360, Taiwan, ROC.
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MeSH Terms
Ammonia / chemistry
Chlorine / chemistry*
Enterobacteriaceae / metabolism
Hydrogen-Ion Concentration
Titrimetry / methods
Waste Disposal, Fluid / methods*
Water Purification / instrumentation,  methods*
Reg. No./Substance:
7664-41-7/Ammonia; 7782-50-5/Chlorine

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