Effect of dilution and operating parameters on ammonia removal from scheduled waste landfill leachate in a lab-scale ammonia stripping reactor
| Autor: | C. M. Hasfalina, A. M. Abdullah, N. M.L. Hanira, C. A. Luqman, Mohd. Rashid |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Central composite design
Stripping (chemistry) 02 engineering and technology 010501 environmental sciences engineering.material Pulp and paper industry 01 natural sciences Dilution Ammonia chemistry.chemical_compound 020401 chemical engineering chemistry Environmental chemistry engineering Response surface methodology Leachate 0204 chemical engineering Turbidity 0105 earth and related environmental sciences Lime |
| Zdroj: | IOP Conference Series: Materials Science and Engineering. 206:012076 |
| ISSN: | 1757-899X 1757-8981 |
| DOI: | 10.1088/1757-899x/206/1/012076 |
| Popis: | A lab-scale ammonia stripping reactor was used to treat raw and diluted (1:1) scheduled waste landfill (SWL) leachate containing ammonia-nitrogen (NH3-N). Operating parameters such as air-liquid ratio, hydrated lime [Ca(OH)2] dosage, types of packing materials and packing heights were investigated with central composite design (CCD) of response surface methodology (RSM) was used to optimize the parameters affecting NH3-N removal from the leachate. The percentage removal on turbidity, colour and phosphate were also evaluated in this study. It was observed that the optimal conditions obtained from desirable response (NH3-N removal) for raw leachate were predicted at air–liquid ratio of 70, Ca(OH)2 dosage of 5 gL-1, packing height of 60 cm and types of packing material was number 3 (non-woven polyester) while for diluted leachate these were 70, 6 gL-1, 60 cm and Type 3 (non-woven polyester), respectively. Quadratic RSM predicted the maximum NH3-N removal to be 78% for raw leachate and 81% for diluted leachate at these optimal conditions concurred with the experiment which successfully removed 76% and 80% of NH3-N, respectively. However, higher removal efficiencies of turbidity (97%), colour (88%) and phosphate (93%) was observed in the treatment with diluted leachate compared to raw leachate merely up to 55%, 34% and 49%, respectively. The finding showed that the difference in the removal of NH3-N in diluted and raw SWL leachate was insignificant. However, turbidity, colour and phosphate showed a significant reduction in the diluted leachate during the treatment. The study suggests that the dilution of SWL leachate does not present a significant effect on the removal of ammonia in the stripping reactor. |
| Databáze: | OpenAIRE |
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