A comparison of different pilot constructed clarifiers with the purpose of achieving the optimum condition in turbidity removal at water treatment plants in Tehran

Abstract

Clarifying is one of the most crucial stages in water treatment at water treatment plants. Determining the type of the clarifier in water treatment plants and using it efficiently is necessary. In this study, a pilot is designed and constructed in which the pulsator, the superpulsator and the accelerator are simulated. For each system, turbidity removal efficiency for different influent turbidities and flow rates were studied and the optimum condition was obtained. The results showed that the superpulsator has a superior performance compared to the pulsator, and the pulsator has a superior performance compared to the accelerator and these differences are more sensible at higher flow rates. Also, the best condition for achieving the highest efficiency for the pulsator and the superpulsator is determined to be at flow rate 3 lit/min for an initial turbidity of 2,500 NTU with alum as the coagulant and the highest efficiency for the accelerator is determined to be at flow rate 3 lit/min for an initial turbidity of 2,500 NTU with ferric chloride as the coagulant. Comparing the turbidity removal efficiency shows that for 67% of the cases, ferric chloride has a better performance as the coagulant compared to alum and increasing the influent turbidity leads to an increase in the removal efficiency. Furthermore, three water treatment plants located in Tehran were studied and their characteristics were compared and suggestions were made to enhance their qualities.

Performance assessment of pulsating floc blanket clarifiers and conventional clariflocculators in pilot‐scale models

“…Thus, a pilot‐scale plant based on upflow pulsating floc blanket technology was designed and fabricated with a capacity to treat about 8,000 liters per day (LPD) at Malaviya National Institute of Technology Jaipur, India. Learning from other previous attempts to construct prototypes (Khezri et al, 2012; Mirbagheri et al, 2017), depiction and control of the behavior of fluid elements was focused upon instead. Also, as literature pertaining to comparative analysis of water treatment technologies at pilot scale is sparse, thus another pilot plant based on conventional upflow clariflocculation technology was designed for same capacity and run in parallel with equivalent influent conditions.…”