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2: Clarification mechanism of coagulant

Chemical coagulation is a process in which chemical agents (coagulants) are added to water treatment to make colloidal dispersion system destabilize and agglomerate. In the coagulation process, small suspended particles and colloidal impurities are aggregated into larger solid particles to separate particulate impurities from water, which is called coagulation clarification.

After adding coagulant into water, colloidal particles and other small particles can be polymerized into larger flocs through the comprehensive action of mixing, coagulation and flocculation. The whole process of coagulation and flocculation is called coagulation.

(1) Destabilization and condensation of colloids

Adding electrolyte to water can compress the electric double layer and destabilize the colloid. The main mechanism is that the electric double layer of colloidal particles in water is compressed or neutralized by adding aluminum salt or iron salt coagulant. The coagulant and raw water are mixed rapidly and evenly, and a series of chemical reactions are produced to destabilize. This process takes a short time, generally about 1 min. Some cationic polymers can also play a role in the destabilization and condensation of colloids in water. These polymers have a long chain structure and positive charge in water. Their destabilization and condensation of colloids in water is due to the interaction of van der Waals force adsorption and electrostatic attraction.

(2) Flocculation and formation of floc (alum)

The particle size of the initial flocculate formed by colloid destabilization and coagulation in water is generally more than 1 m. at this time, Brownian motion can no longer push them to collide and form larger particles. In order to make the initial flocs collide with each other to form large flocs, it is necessary to input additional energy into the water to produce a velocity gradient. Sometimes it is necessary to add organic polymer flocculant into water, and the adsorption bridging effect of long chain molecules of flocculant is used to improve the probability of collision and adhesion. Flocculation efficiency usually increases with the increase of flocculate concentration and flocculation time.

Compared with polyaluminum chloride, polyaluminum chloride has the advantages of high density, fast settling speed and wide pH adaptability; the coagulation effect is less affected by temperature than that of polyaluminum sulfate; however, when adding ferric salt, it should be noted that when the equipment is not in normal operation, the iron ions will make the effluent color, and may pollute the subsequent desalination equipment.

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  • De veelzijdigheid van heavy-duty gelaste staafroosters is een ander belangrijk aspect. Ze kunnen op maat worden gemaakt om te voldoen aan specifieke eisen en afmetingen van een project. Dit maakt ze geschikt voor een breed scala aan toepassingen, van industriële en commerciële gebouwen tot openbare infrastructuur zoals bruggen en voetgangerspaden. Bovendien zijn ze beschikbaar in verschillende afwerkingen, zoals gegalvaniseerd of gepoedercoat, wat extra bescherming biedt tegen omgevingsfactoren.


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  • Before embarking on the search for reputable suppliers, it is crucial to understand why quality shale shaker screens are so important. The primary function of these screens is to remove solid particles, such as cuttings and formation solids, from the drilling fluid. This process is vital for maintaining the fluid's rheological properties, which directly impact drilling efficiency and cost-effectiveness.

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  • スチールグレーチングのサイズ選びは、単なる寸法だけではなく、使用環境や目的に応じた幅広い考慮が必要です。適切なサイズと仕様を選ぶことで、安全で効率的な使用が可能になります。


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  • Rejillas de Acero Mild de Alta Resistencia


  • In summary, the weight of bar grating per square foot is a key consideration when planning various applications across multiple industries. By taking into account the material type, thickness, and design specifications, professionals can make informed decisions that enhance safety, efficiency, and performance in their projects.


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  • Gradini in Griglia Metallica Sicurezza e Stile per le Scale


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  • トレンチドレイングレートは、環境保護の観点からも重要です。適切な排水は、河川や湖沼への過剰な雨水流出を減少させ、水質を保つ助けとなります。都市の雨水管理は、持続可能な開発に欠かせない要素であり、トレンチドレインはその中心的な役割を果たしています。


  • Was sind Rinneneinlaufschächte?


  • A durabilidade é uma marca registrada dos gratings de aço de alta resistência. Eles apresentam resistência à corrosão, especialmente quando tratados com revestimentos especiais, como galvanização a quente. Isso garante que os gratings mantenham sua integridade estrutural ao longo do tempo, mesmo em condições adversas, como exposições a produtos químicos ou ambientes úmidos.


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  • The Importance of Pool Trench Drain Covers


  • Resistenza alla Corrosione


  • Le Prix des Grilles Métalliques Un Aperçu


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  • 2. Lätt att rengöra Eftersom golvristor är designade för att fånga smuts och avfall är de också relativt lätta att rengöra. Många modeller kan enkelt tas bort och diskas, vilket gör dem till en praktisk lösning för livsmedelsindustrin och liknande miljöer.


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  • スムースバーグレーティングは、光学的なデバイスや実験において重要な役割を果たす光学素子です。特に、波長分離、反射、散乱などの光の振る舞いを制御するために使用されます。これらのグレーティングは、特に光の波長が異なる成分を効率よく分離するため、様々な科学技術の分野で非常に重要です。


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