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The research article discusses the use of orange peel as a low-cost adsorbent for removing methyl orange dye from water solutions. The study found that increasing contact time, adsorbent dose, and decreasing particle size led to higher removal of the dye. However, increasing the initial concentration of the dye decreased the removal percentage. The Langmuir isotherm model was found to best fit the experimental data. Overall, orange peel was found to be an effective and affordable adsorbent for water treatment. Another article by Li et al. explores the use of sludge-based activated carbon for removing dyes from water, highlighting its potential as a sustainable and cost-effective solution. [Extracted from the article]

This study focused on the comparative analyses between the alum synthesized from aluminum can and natural coagulant synthesized from watermelon seed in water treatment. It also involved the identification of phytochemical groups of watermelon seed cake. The two different synthesized coagulants were used in jar test analysis; the result obtained showed a good elimination of turbidity and suspended solid particles. The pH of the natural coagulant of the treated water falls within the range of 6.9 to 7.2. Alkaloid tannins, saponin, anthracene and flavonoid were found present in the watermelon seed cake. Moreover, the result from the research showed that both the natural coagulant synthesized from watermelon seed and the one synthesized from aluminum cans could be used as good flocculant in surface water treatment. [ABSTRACT FROM AUTHOR]