Simple and feasible technique to purify and utilize the drainage water from a peat area in South of Thailand part 1: Laboratory experiment
1996
Nayana Puengpan | Tipawan Inthasothi | Chaiwat Sithibhusaya | Wada, Hidenori (Khon Kaen Univ., Khon Kaen (Thailand). Faculty of Science. Dept. of Chemistry)
Due to the need more land for cultivation some peat land in Narathiwat province, Thailand have been reclaimed by drainage. However, drainage water is unsatisfied by the people for its acid and dark color. The present study is to test the effect of Fe2+ on purification of the drainage water. Water samples of different quatity were collected from 3 different drainage canals from a peat area in Narathiwat province. Two series of each water samples (treated and untreated with Ca(OH)2) were prepared. They were added with varying amounts of ferrous sulfate solution and left overnight. Then, they were measured for optical density. It was found: 1. all the drainage waters were almost completely decolorized if the amount of the ferrous sulfate solution was over a certain critical value, 2. the critical value was one mole of ferrous sulfate per one mole organic carbon of the humic substance, 3. the content of organic carbon of the humic substance could be estimated by color of the drainage water, 4. raising pH of the drainage waters with Ca(OH)2 enhanced the decolorization process without changing the critical value.
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