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The Effects of Glycine on Breakpoint Chlorination and Chlorine Dosage Control Methods for Chlorination and Chloramination Processes in Drinking Water

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Abstract

Chlorine is the most commonly used chemical for water and wastewater disinfection worldwide, and it reacts with both ammonia and dissolved organic nitrogen. Using the salicylate spectrophotometric method, effects of glycine on the classic breakpoint chlorination are studied using glycine as a surrogate for dissolved organic nitrogen. The results show that the shape of the breakpoint chlorination curve with glycine was analogous to that of water without glycine. Increasing the glycine concentration moves the chlorination breakpoint curve to the right, demonstrating that more chlorine must be added to replace the chlorine consumed by glycine and yield the desired residual active chlorine concentration. At the peak of the chlorination breakpoint curve, both NH2Cl and mono-chlorinated organic chloramine reach their maximum. The Cl2/N ratio of the peak is linearly related to the glycine concentration, and our calculations indicate that the maximum of mono-chlorinated organic chloramine formation by glycine chlorination occurs at a stoichiometric ratio of 1:1; the same as that for chlorinating ammonia to NH2Cl. The distribution of NH2Cl and organic chloramines is controlled by [Gly]/[NH3-N]. At the breakpoint, ammonia and glycine are completely oxidized by chlorine, which leads to chlorine depletion. The stoichiometric ratio for the complete oxidation of glycine was 3:1, larger than that for complete oxidation of ammonia (2:1). For the different stoichiometric ratio in reaction of oxidation of ammonia and glycine, the sum of ammonia and glycine cannot be used as a chlorine dosage control parameter. The chlorine control method involving ammonia and glycine for chlorine and chloramination process is established.

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Acknowledgments

This study was supported by the National Science Foundation of China (NSFC) Award No. 50908074 and the Fundamental Research Funds for the Central Universities Award No. 2009B17314.

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Authors and Affiliations

  1. Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education & College of Environment, Hohai University, No.1 Xikang Road, Nanjing, 210098, China

    Tao Hui, Xu Feng, Chen Wei, Sun Min, Chen Liang & Feng Bo

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  1. Tao Hui
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  2. Xu Feng
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  3. Chen Wei
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  4. Sun Min
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  5. Chen Liang
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  6. Feng Bo
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Correspondence to Tao Hui.

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Hui, T., Feng, X., Wei, C. et al. The Effects of Glycine on Breakpoint Chlorination and Chlorine Dosage Control Methods for Chlorination and Chloramination Processes in Drinking Water. Water Air Soil Pollut 224, 1686 (2013). https://doi.org/10.1007/s11270-013-1686-y

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