Abstract
BackgroundThe most critical step to control sewage pollution and recycle of wastewater is to establish sewage treatment plants and to monitor their performance. This research aims to assess the environmental impacts of effluent waters, treated by Kermanshah wastewater treatment plant (KWTP), on some physicochemical variables of the adjacent river named as Qarasou River, northwestern Iran. Several water samples were collected from different locations into KWTP and along the Qarasou River in different time intervals of April and July 2017 to assess the effect of treated waters on the environment water quality. As well, an integrated environmental change index (ΔYi) was defined to assess the degree of changes and impacts in the current status.ResultsThe analyses indicated that the values of total suspended solids (TSS), nitrate (NO3), phosphorous (P), biological oxygen demand (BOD), and chemical oxygen demand (COD) overall decreased by treatment process at effluent water compared with raw sewage amounts. Contrarily, amounts of acidity and dissolved oxygen (DO) slightly increased in effluent water due to the aeration processes during the treatment process. The environmental change index (ΔYi) was estimated between 0.04 and 0.88 with an average of 0.28 for all variables in different time intervals, indicating the lowest degree of environmental changes and higher efficiency of treating wastewater in KWTP.ConclusionsThe results concluded the efficiency for the removal TSS, NO3, BOD, and COD is estimated 80–92% during the water purification process in KWTP as an acceptable efficiency. Finally, it can be mentioned that the activated sludge process of KWTP has not any risky impacts on Qarasou River and the whole environment.
Highlights
Wastewater can be produced by more than 80% of the total consumed water in urbanized areas (Metcalf 2003)
This research aims to study the environmental effects of Kermanshah wastewater treatment plant (KWTP) on the adjacent river named as Qarasou River
Most solid suspended solids can be separated from water by filtration so the suspended solids in a water sample can be estimated by water filtering, drying the remaining mass, and filtering to a constant weight at a temperature of 104 °C and determining the remaining mass on the filter
Summary
Wastewater can be produced by more than 80% of the total consumed water in urbanized areas (Metcalf 2003). Consideration of treated wastewater, as a valuable source of recycling water for various consumptions, Nowadays, the wastewater treatment plant gives rise to an environmental impact due to its energy reserve, chemical compounds, and emissions to the atmosphere and sludge production (Hospido et al 2004). Discharging of the mentioned large volume of effluents waters to receiving sources and the surrounding environment has been produced a destructive environmental impact (Kobya et al 2006). This research aims to assess the environmental impacts of effluent waters, treated by Kermanshah wastewater treatment plant (KWTP), on some physicochemical variables of the adjacent river named as Qarasou River, northwestern Iran. Several water samples were collected from different locations into KWTP and along the Qarasou River in different time intervals of April and July 2017 to assess the effect of treated waters on the environment water quality. An integrated environmental change index (ΔYi) was defined to assess the degree of changes and impacts in the current status
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