Abstract
Some natural organic compounds (NOC) such as aromatic compounds can trigger the formation of disinfection by-products (DBPs). In chlorination (disinfectant) process resultant water quality depletes. Some safe alternative oxidants are needed for cleaning water pollutants. KMnO4 had shown better oxidation results, especially for reducing aromatic and non-aromatic organic compounds present in water. The aim of this study was to analyze the effect of KMnO4 and Ca(OCl)2 oxidants on the concentration of high and low molecular weight organic matter including aromatic compounds in the water sample. In this experiment, artificial organic compounds, namely sinapic acid (high molecular weight aromatic compound) and resorcinol (low molecular weight aromatic compound) were used to identify the characteristic of organic matter under different molecular weights. Sinapic acid and resorcinol were oxidized by using KMnO4 and Ca(OCl)2 with a minimum contact time of 60 minutes. Samples were analyzed for aromatic contents and total organic carbon (TOC) before and after completion of the experiment by using UV-Vis spectrophotometer at 254 nm wavelength (UV254). It has been observed that both oxidants increased TOC concentration. Ca(OCl)2 produces a higher percentage of organic matter degradation by-products (DBPs) such as chloroform (CHCl3) a highly toxic compound than KMnO4. Since Ca(OCl)2 has a higher oxidation potential than KMnO4. It has been observed that KMnO4 is a safer oxidant than Ca(OCl)2 as potassium permanganate produces less amount of DBPs.
Highlights
Some natural organic matter (NOM) are present in water bodies in abundant amount
The results found that total organic carbon (TOC) increased, it indicates that the non-aromatic organic matter was present in more quantity in treated samples as compared to the untreated samples of sinapic acid
This study revealed that increasing TOC was in accordance with increasing CHCl3 concentration
Summary
Some natural organic matter (NOM) are present in water bodies in abundant amount. These organic compounds are a mixture of different kinds of organic matter. It is necessary to think about the use of alternative oxidants or materials to eliminate NOM of water, such as (O3) ozone, ClO2, and KMnO4 (Hidayah et al 2017). Such Oxidation treatment improves water quality and reduces biological growth. The synthetic organic materials having low matter in terms of TOC by UV-Visible spectrophotometer at molecular weights were selected for experimental purposes. 254 nm, and concentration of disinfection by-products i.e
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