ARSENIC REMOVAL IN GROUNDWATER BY INTEGRATED OZONATION AND ADSORPTION BY ACTIVATED CARBON AND ZEOLITE
Arsenic is highly toxic that long-term exposure to inorganic arsenic, especially through drinking water and food, can lead to chronic arsenic poisoning. There are several case studies reported regarding the problem of arsenic contamination in Indonesia. Therefore, it is essential to do research on t...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/32892 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Arsenic is highly toxic that long-term exposure to inorganic arsenic, especially through drinking water and food, can lead to chronic arsenic poisoning. There are several case studies reported regarding the problem of arsenic contamination in Indonesia. Therefore, it is essential to do research on the arsenic removal in water as an effort to prevent public health problems. In this study, we investigated the effectiveness of arsenic removal from groundwater with a hybrid process integrating oxidation with ozone and adsorption with activated carbon and zeolite in a 2 L volume batch reactor. Artificial ground water was used in this study, using sodium arsenite (NaAsO2) as an As (III) source. The experiment shows that the arsenic adsorption efficiency in integrated ozonation-adsorption process is higher than individual adsorption process and is achieved in a shorter time. For individual adsorption process, either with GAC or zeolite, both reached maximum removal in 2 hours. For integrated ozonation-adsorption process, adsorption efficiency reached maximum removal in 1 hour. Maximum removal for integrated ozonation-adsorption process with ozone dose 10.1 mg/minute is 99.97% for both cases of ozone-GAC and ozone-zeolite, with adsorbent doses are 10 g/L and 7.5 g/L respectively. Total arsenic concentration in solution reached <0.001 mg/L in 1 hour for both cases of ozone-GAC and ozone-zeolite with adsorbent dose 10 g/L and 7.5 g/L respectively, which is in accordance with Indonesia’s drinking water standard. Arsenic adsorption by GAC is more suitable to be modeled by Langmuir isotherm model, meanwhile ozone-GAC, zeolite, and ozone-zeolite processes are more suitable to be modeled by Freundlich isotherm model. Arsenic adsorption processes by GAC, zeolite, ozone-GAC, and ozone-zeolite are compatible with pseudo first order kinetic. |
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