B. Heidari; M.H Mehdi Nejad; A.A. Najafpour; A. Zafarzadeh; H. Elahi
Abstract
Background & Objective: The issues of environmental engineering , due to its technical , environmental, social and economic factors are complicated. So, it is difficult to determine which variables are more effective. The purpose of this study was to investigate the effective variables by using ...
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Background & Objective: The issues of environmental engineering , due to its technical , environmental, social and economic factors are complicated. So, it is difficult to determine which variables are more effective. The purpose of this study was to investigate the effective variables by using AHP and choose the best method of wastewater treatment (Soleimani Village). Materials & Methods: This is a descriptive study with applying approach. By using AHP is the preferred choices were determined. This method was evaluated by using software Expert Choice. In this regard, after considering the factors affecting or affected by, 3 criteria and 15 sub-criteria, and then the analytic hierarchy process were used. Then, the wastewater treatment processes were prioritized. The processes are constructed wetland systems, rotating biological discs, extended aeration with floating Media and activated sludge. They were based on technical criteria, economic, efficient of treatment process, sub- criteria, weighting and prioritization. Results:The results showed that weight scores of constructed wetland, rotary biological disc, extended aeration with floating Media and activated sludge were 0.36, 0.28, 0.2 and 0.15, respectively. Therefore, the treatment of choice in rural areas was constructed wetland treatment. Conclusions: The results show economic criteria are more effective to make the final decision. By the way, the technical criteria were also considered (e.g., ease of operation and construction, etc.) It can be concluded that the wetland method is the best alternative for Soleimani village.
Mahdi Sadeghi; Bay Abotaleb; Naser Bay; Nafiseh Soflaie; Mohammad Hadi Mehdinejad; Morteza Mallah
Abstract
Background & Objective: water, urban, industrial and agricultural centers are usually held near rivers. Surface water sources over other sources of water pollution are more at risk. The goal of this study was to evaluate the quality of the Zaringol River and the impact of agricultural drainage water ...
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Background & Objective: water, urban, industrial and agricultural centers are usually held near rivers. Surface water sources over other sources of water pollution are more at risk. The goal of this study was to evaluate the quality of the Zaringol River and the impact of agricultural drainage water was designed and implemented. Materials & Methods: In regard to agricultural activity around the Zaringol river stations studied and the samples from agricultural drainage water and streams in summer and autumn period specified were taken. NSF WQI index parameters including 9 parameter dissolved oxygen, fecal coliform, pH, BOD, temperature, phosphate, nitrate, turbidity, total dissolved solids, which were measured by using standard methods. Results: The results from the study showed that the index based on NSF WQI for all stations were between 54 to 61. Agricultural water drainage WQI index is between 45-37 that according to the index is poor quality. Conclusion: According to the NSF WQI index indicated that water quality in the river is moderate. But agricultural drainage water quality is bad and affects the quality of river water. Due to the relatively high levels of water quality in the middle class of nutrients, especially nitrates, coliform presence of E.coli that drainage water from agricultural and recreational activities in the upstream station is monitored.