Modelling the effect of salt from road runoff on nitrification of a wastewater treatment plant

IF 1.6 Q3 WATER RESOURCES Water Practice and Technology Pub Date : 2023-04-17 DOI:10.2166/wpt.2023.059
N. Jovanović, Sandra Breu, H. Plihal, Guenter Langergraber
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Abstract

Salt (NaCl) that is being dispersed on the roads to prevent the formation of ice and snow can have positive and negative effects on nitrification rates in wastewater treatment plants (WWTPs). Based on experimental data, a numerical model has been derived to describe these effects. The numerical model has been successfully implemented in the SIMBA# simulation software and tested on a real case study, the Freistadt WWTP, located in Upper Austria. A number of parameters impacting nitrification have been investigated: inflow salt concentration, duration of the salt loading, temperature during salt loading, and increasing volumetric inflow to the WWTP during salt loading events. Simulation results revealed that salt concentration lower than 1 g NaCl/l brought improvement in nitrification rates. However, when this threshold was exceeded, inhibition of nitrification occurred. Furthermore, prolonged salt dosing exposure times brought amplification of both positive and negative effects on removal rates. Results show that salt concentration and salt load have the biggest impacts on nitrification.
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模拟道路径流中的盐分对污水处理厂硝化作用的影响
分散在道路上以防止冰雪形成的盐(NaCl)会对废水处理厂(WWTP)的硝化率产生积极和消极的影响。基于实验数据,推导出了描述这些影响的数值模型。该数值模型已在SIMBA#模拟软件中成功实现,并在位于上奥地利的Freistadt污水处理厂的实际案例研究中进行了测试。已经研究了影响硝化作用的许多参数:进水盐浓度、盐负荷持续时间、盐负荷期间的温度,以及在盐负荷事件期间增加污水处理厂的体积进水量。模拟结果表明,盐浓度低于1g NaCl/l可提高硝化速率。然而,当超过该阈值时,硝化作用发生抑制。此外,延长盐剂量暴露时间会对去除率产生积极和消极的影响。结果表明,盐浓度和盐负荷对硝化作用的影响最大。
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来源期刊
CiteScore
2.30
自引率
6.20%
发文量
136
审稿时长
14 weeks
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