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DAF system 2
Industrial Mixing

Coagulation and Flocculation Process and Mixing Essentials

Coagulation & Flocculation PROCESS MIXING ESSENTIALS Wastewater has particulate matter which must to be removed before further treatment and clarification, these particles (colloids) are negatively charged. Such particles are very minute and take a very long time to settle.  The help increase the time for these particles to settle from a weeks or hours to a few minutes the coagulation process has to be applied early in the water treatment stage. Generally the coagulation stage happens after the Ph adjustment stage, where the water is adjusted to be more alkaline, so that additives like aluminum sulphate or ferric sulphate (trivalent coagulants) can be effective for coagulation and flocculation process. Coagulation Process The objective is to create microfloc from particulate matter,

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Quality Mixing
Mixer Configuration

Agitator Design for Wastewater Clarification – Part 2

Clarification on Flocculation In our previous article, Agitator Design for Wastewater Clarification Part 1, we looked at how to optimize a mixer for the unit process of coagulation. In wastewater treatment, coagulation is normally followed by flocculation. While coagulation is used to destabilize and agglomerate suspended waste particles, flocculation brings the colloids out of suspension in the form of floc, and allows the particles to be more readily removed from the water stream. In this article, we will examine the process of flocculation, the flocculator mixer, and how mixer parameters change to achieve the desired result. Flocculation Following the coagulation of destabilized microscopic particles in wastewater, the process of flocculation encourages the newly formed micro-floc to stick together, making even larger clumps

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Mixing in water treatment
Mixer Configuration

Agitator Design for Wastewater Clarification – Part 1

Clarification on Coagulation Clarification of water using coagulating agents has been practiced since ancient times. The use of alum as a coagulant dates back to the Romans around 77 AD, and by 1757, England was using alum for coagulation in municipal water treatment. This clarification process remains essential in various water treatment disciplines today. In the modern water treatment plant, the use of coagulants to treat wastewater are better understood, which has led to significant optimization of process equipment and chemistry. Coagulation and flocculation are two common unit processes that are designed to remove very small particulate matter by forcing them to clump or stick together so that they will settle out and be removed from the wastewater as “sludge”.

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P4 Pitch Impeller Flow Pattern
Mixer Configuration

Flash Mixing with a Rapid Mixer

Flash Mixing in Water Treatment The water treatment process truly begins with a very brief turn in a flash mixing chamber. After screening out debris and testing raw water, chemicals that encourage coagulation are added to the water stream. The mixture is agitated quickly and thoroughly in a process called flash mixing. The chemicals introduced into the water stream will attract any very fine particles, such as silt, that will not readily settle or filter out and make them clump together. These larger, heavier formations are called floc, which are much easier to remove from the water. Flocculation Preparation In the case of the flocculation process, the rapid mixer is specifically designed to disperse polymers so they enhance flocculation by optimizing

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Polymer Activation
Dynamix Products

Optimizing Polymer Mixing in Water and Wastewater Treatment

Optimizing Polymer Mixing in Water and Wastewater Treatment A major concern in water and wastewater treatment processes is identifying the most effective and efficient way to remove solid particles and other materials found in the liquid stream. The most effective method of eliminating unwanted contaminants is through the use of polymers in a sludge-creating process. Polymers are used to coagulate suspended solids and produce large curds of solid materials (floc) which are more easily removed from the water treatment stream. Polymers are available in a variety of forms and concentrations and are supplied as either dry powders or concentrated liquids.  Each variation presents unique challenges when sizing mixers. Dry Polymers: Polymers supplied in powder form must be wetted out which

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Wastewater Mixers in Water Treatment
Mixer Configuration

Selecting Wastewater Mixers for Wastewater Treatment – Part 1

Selecting Wastewater Mixers for Wastewater Treatment – Part 1 Wastewater Mixers for Optimal Chemical Preparation Chemical preparation in wastewater and water treatment directly impacts many downstream processes. Let’s take a look at several common chemicals used and some key factors that influence their preparation and the selection of wastewater mixers. Lime Slurry Preparation When preparing lime slurries for controlling pH, uniformity is critical. Why? Because lime solids must reach/stay in suspension if they are to serve their purpose in downstream processes. For this reason, it’s essential that wastewater and water treatment facilities have lime slurry mixers that can efficiently and effectively make up/maintain uniform slurries. In order to successfully suspend/re-suspend solids, a mixer needs to create a flow pattern that involves the entire

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