Assessing of channel roughness and temperature variations on Parkand Abad WWPT's wastewater quality using numerical modeling

Nowadays, problems and barriers to supply adequate water and also environmental issues have caused wastewater treatment (WWT) to be considered a high priority. In light of high costs of WWT, using natural capacities to reduce pollution could be potentially significant. In this study, the impact of varying temperature and channel roughness have been investigated on the wastewater quality parameters using the QUAL2K(Q2K) Numerical Model. The results show, as temperature increases, the reduction rate of Biochemical Oxygen Demand (BOD) is more than the Chemical Oxygen Demand (COD) and , nitrate concentration increases. This numerical assessment indicates that the purification rate is too great as temperature rises above 30°C. Also the results indicate that by increasing channel roughness, BOD and COD have descending trends and Ammonium and Phosphorus have ascending trends. According to the obtained results, nitrate (NO3) has decreasing trend when the Manning Roughness Coefficient (n) is higher than 0.04 along the channel, but is reduced when “n” is less than 0.04.