Tujuan utama kajian ini adalah menilai peratusan penyingkiran kekeruhan, besi dan warna dari air bawah tanah dengan menggunakan karbon teraktif dan tanah liat kaolin yang diubahsuai (sintetik zeolite) sebagai media. Kecekapan jerapan diselidik oleh siri ujikaji jerapan batch, serta ujikaji kolum. Pertama sekali, tanah liat kaolin diubahsuai menjadi zeolite melalui proses sintesis untuk meningkatkan kapasiti jerapan sebelum digunakan sebagai media untuk merawat air bawah tanah. Kecekapan penyingkiran antara media tidak dirawat dan pra-rawatan oleh Asid Hidroklorik (HCl) dan Kalium Hidroksida (KOH) dibandingkan. Saiz zarah yang digunakan untuk karbon teraktif dan sintetik zeolite adalah 1.18 mm-2.0 mm. Kadar alir malar iaitu 2 mL/min terhadap waktu tindak balas yang berbeza digunakan untuk mengetahui kecekapan proses jerapan. Keputusan kajian batch menunjukkan peratusan penyingkiran maksimum iaitu 99.07% kekeruhan, 100% besi and 55.88% warna telah disingkirkan oleh urutan karbon teraktif dan sintetik zeolite pada dos optimum iaitu 7.5 g pada 100 mL air bawah tanah. Perbandingan antara media yang tidak dirawat dan media prarawat menunjukkan media pra-rawat mempunyai kecekapan penyingkiran yang lebih baik di mana 99.96% kekeruhan, 100% besi dan 97.06% warna telah disingkirkan oleh. Manakala, hasil kajian kolum menunjukkan kecekapan jerapan terbaik ditemui pada masa tindak balas optimum iaitu 6 jam dengan kecekapan penyingkiran maksimum iaitu 99.95% kekeruhan, 100% besi dan 97.06% warna telah disingkirkan oleh siri karbon teraktif dan sintetik zeolite. Oleh itu, dapat disimpulkan bahawa penggunaan karbon teraktif dan sintetik zeolite sebagai media penapisan telah menunjukkan kecekapan jerapan yang sangat efektif dalam menyingkirkan kekeruhan, besi dan warna dari air bawah tanah.
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The main objective of this study is to evaluate the percentage removal of turbidity, iron and colour in groundwater by using activated carbon and modified kaolin clay (zeolite synthetic) as a media. The adsorption efficiency was investigated by a series of batch adsorption experiments, as well as column experiments. Kaolin clay was first modified into zeolite through the synthesis process to improve their adsorption capacity before it was used as a media to treat the groundwater. The removal efficiency between the untreated and pretreated media by Hydrochloric Acid (HCl) and Potassium Hydroxide (KOH) was also compared. The particle size used for both activated carbon and zeolite synthetic was 1.18 mm- 2.0 mm. A constant flow rate of 2 mL/min against different contact times was applied to investigate the efficiency of the adsorption process. The results of batch studies shows that the maximum removal percentage of 99.07% of turbidity, 100% of iron (Fe) and 55.88% of colour was removed by sequence of activated carbon and zeolite synthetic at optimum adsorbent dosage of 7.5 g per 100 mL of groundwater. A comparison between untreated and pretreated media shows that the pretreated media has better removal efficiency where 99.96% of turbidity, completely 100% of iron and 97.06% of colour was removed. While, the results of the column studies indicated that the best adsorption efficiency was found at the optimum contact time of 6 hours with the maximum removal efficiency of 99.95% of turbidity, 100% of iron and 97.06% of colour was removed by the series of activated carbon and zeolite synthetic. Therefore, it can be concluded that the use of activated carbon and zeolite synthetic as a filtering media results in a very effective adsorption efficiency in removing turbidity, iron and colour from groundwater.
Groundwater treatment using activated carbon and modified kaolin clay_Rohana Abdullah_A9_2011_NI