Abstract
In this study, magnetite Zn/Al layered double hydroxide (LDH) composite has been synthesized through the chemical co–precipitation method. Raw water samples of Thu Duc and Tan Hiep water plant were also collected and analysed, they were used as the object to investigate dissolved organic compounds (DOC) adsorption capacity of the material. The results of DOC empirical adsorption experiments in raw water samples of Thu Duc and Tan Hiep water plants also show that the adsorption processes reach high efficiencies when the sample solutions are adjusted to pH from 5 to 6. After 21 hours, the adsorbent in column loses its adsorption ability with the corresponding adsorption capacity of 8.12 mg/g.
Highlights
Natural organic matters (NOMs) is a complex mixture derived from the decomposition of plants and animal carcasses
dissolved organic compounds (DOC) concentrations measured in the samples are relatively low, which are 4.48 mg/l for Tan Hiep water plant and 6.18 mg/l for Thu Duc water plant
Because of the small DOC amount, the humic acid content in these samples could not be quantified. This leads to the prediction that the DOC content of samples mainly consists of non – humic substances, organic micronutrients and organic matter from waste sources
Summary
Natural organic matters (NOMs) is a complex mixture derived from the decomposition of plants and animal carcasses. High amount of NOMs reacts with chlorine to form toxic DBPs (THMs, HAAs, HANs) and lower disinfection capacity, and requires more treatment chemicals and materials in order to meet effective results [2]. Facing such challenges, various technologies, such as adsorption, coagulation, electrochemical coagulation, membrane filtration and advanced oxidation processes [3], are focused for the removal of NOMs. Out of all the measurements, adsorption is considered one of the most costeffective and easy-handling methods for pollutants removal in water [4]. Synthetic and hybrid materials are encouraged to be widely researched and applied in water treatment due to its high adsorption capacity, less toxicity and high regeneration ability
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