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در نگاه آمایشی پایداری محیط زیست و بازگشت به طبیعت اهمیت خواهد یافت

Impact assessment of treating
wastewater on the physiochemical variables
of environment: a case of Kermanshah
wastewater treatment plant in Iran
Siamak Baharvand
1*
and Mohammad Reza Mansouri Daneshvar
2
Abstract
Background: The 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
efuent 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 diferent
locations into KWTP and along the Qarasou River in diferent time intervals of April and July 2017 to assess the efect
of treated waters on the environment water quality. As well, an integrated environmental change index (ΔYi
) was
defned to assess the degree of changes and impacts in the current status.
Results: The analyses indicated that the values of total suspended solids (TSS), nitrate (NO
3
), phosphorous (P),
biological oxygen demand (BOD), and chemical oxygen demand (COD) overall decreased by treatment process at
efuent water compared with raw sewage amounts. Contrarily, amounts of acidity and dissolved oxygen (DO) slightly
increased in efuent 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 diferent time intervals,
indicating the lowest degree of environmental changes and higher efciency of treating wastewater in KWTP.
Conclusions: The results concluded the efciency for the removal TSS, NO3
, BOD, and COD is estimated 80–92% during the water purifcation process in KWTP as an acceptable efciency. Finally, it can be mentioned that the activated
sludge process of KWTP has not any risky impacts on Qarasou River and the whole environment.
Keywords: Urban sewage, Treatment plant, Physicochemical variables, Kermanshah wastewater treatment plant
(KWTP)

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