What is meant by flash mixer?
Flash Mixer, Flocculators, Agitators A flash mixer is a chamber that contains mechanical stirrers, which is designed to assure fast, thorough, mixing of lime and alum for the purpose of creating floc. After screening out debris and testing the raw water, water treatment really begins at the flash mix chamber.
What is the primary purpose of flash mixing?
The primary purpose of flash mixing is to rapidly mix and uniformly (evenly) distribute the coagulant chemical throughout the water.
What is flash mixing and slow mixing?
Flash Mixers or Rapid Mixers Mechanism are widely used in all Industrial, water & Waste Water Application for Rapidly and uniformly dispersing Coagulant all over the tank liquid. Usually slow to medium speed impellors are designed for optimum power consumption for maintianing turbulent stage of liquid.
How long does the flash mixing process take?
Flash mixing typically lasts a minute or less. If the water is mixed for less than 30 seconds, the chemicals will not properly mix into the water. On the other hand, if mixing lasts more than 60 seconds, the mixer blades will shear the newly forming floc into small particles. After flash mixing, coagulation occurs.
What is coagulation process in water treatment?
Coagulation is the chemical water treatment process used to remove solids from water, by manipulating electrostatic charges of particles suspended in water. This process introduces small, highly charged molecules into water to destabilize the charges on particles, colloids, or oily materials in suspension.
What are types of mixers used for flocculation in wastewater treatment?
Flocculation Process Using Static MixersBitumen froth.CO2 Mixer.Crude oil metering.Desuperheater.Direct steam heating.Heat Exchanger.Inline static mixer.Inline steam heater.More items...•
What is coagulant and flocculant?
Coagulation and flocculation are two separate processes, used in succession, to overcome the forces stabilising the suspended particles. While coagulation neutralises the charges on the particles, flocculation enables them to bind together, making them bigger, so that they can be more easily separated from the liquid.
What is flocculant for?
Flocculation and coagulation treatment chemicals are used in effluent wastewater water treatment processes for solids removal, water clarification, lime softening, sludge thickening, and solids dewatering.
What is the purpose of aeration in water treatment?
In industrial water conditioning, one of the major objectives of aeration is to remove carbon dioxide. Aeration is also used to oxidize soluble iron and manganese (found in many well waters) to insoluble precipitates. Aeration is often used to reduce the carbon dioxide liberated by a treatment process.
How long is flocculation?
Design contact times for flocculation range from 15 or 20 minutes to an hour or more, and flocculation requires careful attention to the mixing velocity and amount of mix energy. To prevent floc from tearing apart or shearing, the mixing velocity and energy are usually tapered off as the size of floc increases.
What is Clariflocculator in water treatment plant?
Clariflocculator is a combination of flocculation and clarification in a single tank. It has two concentric tanks where inner tank serves as a flocculation basin and the outer tank serves as a clarifier.
What is Jar testing?
A laboratory procedure that simulates coagulation/flocculation with differing chemical doses. The purpose of the procedure is to estimate the minimum coagulant dose required to achieve certain water quality goals.