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Key Factors to Lime Slurry Usage in Water Treatment Processes

LIME SLURRY USAGE FOR WATER TREATMENT PROCESSES FACTORS TO CONSIDER What is Lime? Not to be confused with the lime you find in your local produce store, Lime is a commonly used chemical for wastewater treatment and can be slaked when water is added and turned into slurry. The use of lime in its various forms has been steadily on the rise. Today lime is the most important chemical used throughout the world for pollution control. It is, therefore, imperative that handling and processing lime be well understood by all those who use this chemical. The Lime used in the water treatment industry is referred to as either quicklime (CaO) or hydrated lime (Ca(OH)², which is hydrated in

August 1, 2017 No Comments

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

April 7, 2016 No Comments

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”.

March 21, 2016 No Comments

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

December 28, 2015 No Comments

Water Treatment

Measuring Water Quality From Outer Space

USING SATELLITES to measure water quality A team of international researchers has recently demonstrated that water quality can be assessed from outer space. Researchers from the University of Leicester, the Hungarian Academy of Science and industrial partners published in Elsevier, have successfully used satellite technology to visualize pollution levels otherwise invisible to the human eye through ‘Superhero vision’. While these methods have previously been used for seas and oceans, they are not readily available for lakes, especially shallow lakes with complex optical environments defined by a mix of different natural substances in the water. The study focused on Lake Balaton, which is Central Europe’s largest lake and a popular tourist spot. The lake’s “very shallow depth means that Balaton is a unique system, as both a habitat

May 14, 2015 No Comments

Mixing 101

Mixing 101: Optimal Tank Design

UNDERSTANDING HOW TANK DESIGN AFFECTS MIXING Apart from the actual mixer, the design of the mixing tank is the single most important factor in producing a successful result in any process. In order to allow optimal performance from a mixer’s impeller, it is essential to create an environment that supports both correct impeller positioning and appropriate liquid coverage of the impeller. Incorrect positioning negatively affects the performance of a mixer, the quality of a product, and may even be detrimental to the performance life of the mixer drive. When looking at tank designs, vertical cylindrical, and square or rectangular tanks are most common. In the process of selecting the optimal tank design for an application there are certain rules of

March 10, 2015 4 Comments

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mixing matters blog

Industrial Mixing topics from your mixing experts