Abstract
This article presents the results of a laboratory-scale research focused on the use of alternative coagulants in water treatment. Attention was particularly paid to natural cation coagulants derived from Moringa oleifera seeds and chitin. These two coagulant agents were used in laboratory research for treating real raw water. Several series of laboratory jar tests were performed to identify the effectiveness of the selected coagulants in removing turbidity from water. The results of the experiments show that the efficiency of the process using natural polymers is not as high as that of conventional chemical reagents. A turbidity reduction efficiency of 80-82% was achieved, which is not as impressive as aluminum sulphate. However, it is a certain alternative in cases of secondary product formation (residual Fe and Al) and associated problems. Here it is possible to use a combination of natural and conventional reagents.
Highlights
The introduction of a coagulation process is often required for treating water from surface sources to decrease turbidity and color, as well as the volume of pathogenic organisms
Various coagulant agents are used for the process and the selection of a suitable coagulant depends upon the type of substance removed, as well as the overall water treatment process [1]
Our research focused on the comparison of effectiveness in reducing turbidity after applying three coagulants used in water treatment
Summary
The introduction of a coagulation process is often required for treating water from surface sources to decrease turbidity and color, as well as the volume of pathogenic organisms. The process may be optimized for the removal of natural organic matter (NOM) and heavy metals. Various coagulant agents are used for the process and the selection of a suitable coagulant depends upon the type of substance removed, as well as the overall water treatment process [1]. Inorganic coagulants are metal salts, or possibly in a hydrolyzed polymer form. Organic coagulants are available in many types of substances and create long chains. In recent years, polymer coagulants are used, most often as auxiliary agents used to increase the efficiency of water treatment on the one hand and decrease costs on the other
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