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https://ptsldigital.ukm.my/jspui/handle/123456789/578489| Title: | Ammonia nitrogen adsorption using spent mushroom substrate biochar (SMSB) |
| Authors: | Siti Fatimah Halim (UITM) Soon Kong Yong (UITM) Chia Chay Tay (UITM) |
| Keywords: | Activated carbon Ammonia Ammonium Charcoal Nutrient Sewage wastewater |
| Issue Date: | Jul-2017 |
| Description: | The objective of this study is to elucidate sorption mechanism of ammonia-N by Spent Mushroom Substrate Biochar (SMSB), produced from pyrolysis process of Spent Mushroom Substrate (SMS) at 550°C for two hours. Surface functional group, ash contents, and elemental compositions were analysed using Boehm titration, furnace and Inductively Coupled Plasma-Optical Emission Spectroscopy (ICPOES) respectively. Sorption parameters (i.e., sorbent dosage, input ammonia-N concentration, and contact time) were optimised, and the sorption data were analysed using kinetic models (i.e., pseudo-first-order and pseudo-second-order), and isotherm models (i.e., Langmuir, Freundlich, and Dubinin-Radushkevich (D-R)). The surface of SMSB consists of carboxylic (0.3 mmol/g), phenolic (0.5 mmol/g), and basic functional groups (0.2 mmol/g). Sorption of ammonia-N was best described by the pseudo-second-order kinetic model and the Dubinin-Radushkevich (D-R) isotherm model. The D-R sorption capacity for SMSB was 12.6 mg/g, and correlates well with the amount of acid functional groups (i.e., carboxylic and phenolic groups) in SMSB (i.e., 14.4 mg/g). The low Freundlich constant (n = 0.754), and low D-R mean free energy per mol of the adsorbate (E = 4.4 kJ/mol) indicates a physical sorption process, and ammonia-N binds with acid functional groups through weak forces. The result shows great potential of SMSB for removing ammonia-N in wastewater. |
| News Source: | Pertanika Journals |
| ISSN: | 0128-7680 |
| Volume: | 25 |
| Pages: | 9-20 |
| Publisher: | Universiti Putra Malaysia Press |
| Appears in Collections: | Journal Content Pages/ Kandungan Halaman Jurnal |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_115967+Source01+Source010.PDF | 413.83 kB | Adobe PDF |  View/Open |
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