Rapid Mixing is the process of combining a very quick coagulant, such as FeCl3, in potable water treatment tanks where a large to extremely large volume of dirty water is flowing. Top entry mixers using axial flow impellers are a preferred mixing method.

The main objective of the designed rapid mix tank was to provide a functional atmosphere for coagulation to occur and destabilize the arsenic charges in the groundwater so the arsenic can be easily settled out when they proceed to the flocculation

promotes larger flocs by reducing mixing and sheer. Small dense flocs combine into larger flocs. The compartments are often separated with a baffle. number of paddles on each paddle wheel having a common horizontal shaft. Tapered energy flocculation in baffled channels generally is achieved by varying the spacing of the baffles. That is;

Coagulation is an essential component in water treatment operations. Evaluation and optimization of the coagulation/rapid mixing step of the water treatment process includes a variety of aspects. Optimal coagulant dosages are critical to proper floc formation and filter performance.

The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mg/L. The theoretical mean hydraulic detention time of the tank will be 1 minute. Determine the following: a. The quantity of alum needed on a daily basis in kg/d b. The dimensions of the tank in meters for a tank with equal length, width, and depth c.

The flash (or rapid) mixing and coagulation stages consist in adding chemicals to raw water to foster coagulation while attracting particles that doesn’t settle or cannot be filtered.

Jun 30, 2023 · Rapid mixing increases shear stress, which damages particles and reduces their efficiency in removing contaminants from water. To avoid these problems, it is important to use the right amount of mixing energy and to carefully monitor the process.

Oct 5, 2024 · Design a conventional vertical-shaft rapid mix tank unit for uniformly dispersing coagulant in 10 MLD of settled raw water as per design parameters given below: Detention time (t): 20 – 60 s Ratio of tank height (H) to diameter (D): (1:1 to 1:3)

Flash/Rapid Mixer Tank: 40 Seconds Design Basis: Maximum Flow 2.6 MGD (million gallons per 24 hours day) The key or prime factor of the designing a flash mixer is to defining the maximum and typical flow rate.

Rapid or Flash mixing is the process by which a coagulant is rapidly and uniformly dispersed through the mass of water. This process usually occurs in a small basin immediately preceding or at the head of the coagulation basin.