water and its treatment engineering chemistry notes

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Maintaining the correct pH level in cooling tower water is vital for preventing corrosion and scaling. Typical pH adjusters include acids (such as sulfuric acid) and bases (like sodium hydroxide). Regular monitoring and adjustment of pH levels help ensure that the water remains in the optimal range (generally between 6.5 and 8.5), thus enhancing the effectiveness of other treatment chemicals and the overall system performance.


Types of Water Treatment Chemicals


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Flocculants are used in conjunction with coagulants to enhance the aggregation of particles into larger clusters (flocs) that can be easily removed. Some commonly used flocculants include synthetic polymers such as polyacrylamide. The addition of flocculants helps improve the efficiency of the sedimentation process, leading to clearer water and reducing the burden on subsequent filtration stages.


2. Chemical Methods Chemical treatment is one of the most widely used approaches. Sodium hypochlorite, hydrogen peroxide, and chlorine dioxide have been utilized for the oxidation of cyanide to less harmful compounds, such as cyanate or carbon dioxide. The advantages of chemical methods include their quick reaction times and capability to treat high concentrations of cyanide. However, careful management of reaction conditions is essential to avoid the formation of toxic byproducts.


 

 

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