Effect of temperature on onset of nitrification in chloraminated distribution system
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Controlling nitrification is a challenge as the causes of onset of severe nitrification in chloraminated distribution systems are not yet well identified. Biostability concept is recently introduced to define the conditions at which nitrification would onset. At biostable residual, growth rate is balanced by disinfection rate. Growth rate is a function of free ammonia present, maximum growth rate, and coefficients defining the balance are assumed constant. Although maximum growth rate and disinfection rate coefficients are known to vary with temperature, it is yet to be taken into account. Water temperature in distribution systems varies between 6 and 35°C. Optimum temperature for ammonia oxidising bacteria (AOB) is between 25 and 30°C, which makes the variation of growth rate non-exponential beyond 20°C. In this paper, how biostability curve would alter within the full practical range of practical temperature is shown, by analysing the data obtained for a bacterium that behaves similar to AOB found in distribution systems.
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Sarker, Dipok; Sathasivan, Arumugam; Joll, Cynthia; Heitz, Anna (2013)The biostability concept has been successfully used to predict the onset of nitrification in drinking water distribution systems, but in certain cases deficiencies have been observed in the predictions, indicating that ...
Effect of iron corrosion on the fate of dosed copper to inhibit nitrification in chloraminated water distribution systemZhan, Weixi (2011)Nitrification has been acknowledged as one of the major barriers towards efficient chloramination in water supply distribution systems. Many water utilities employing monochloramine as the final disinfectant have been ...
Sarker, D.; Patel, C.; Heitz, Anna; Anwar, Faisal (2018)Maintaining adequate chloramine and overcoming nitrification are major challenges faced by water utilities where chloramine is used as a disinfectant. Laboratory batch experiments were carried out to evaluate the effectiveness ...