Publications by authors named "Sun-A An"
This study was to enhance the nitrogen removal efficiency in the sequencing batch reactor (SBR) process by adding sulfur-based carriers. The nitrogen removal efficiency of the control group was compared with that of the experimental group through a two-series operation of SBR1 without carrier and SBR2 with the carrier under the condition of no external carbon source. A total nitrogen (T-N) removal efficiency of 6.
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- The study examined how chlorine, a common cleaning agent, affects the deterioration of polyamide thin film composite membranes used in reverse osmosis and nanofiltration processes under different conditions.
- Exposure to varying levels of chlorine (1000 to 10,000 ppm h) and temperatures (10 °C to 30 °C) resulted in a decrease in filtration performance while increasing membrane permeability.
- Techniques like ATR-FTIR and scanning electron microscopy analyzed the chemical and physical changes in the membranes, leading to insights about degradation and potential impacts on their operational lifespan.
In this study, four sulphur-based carriers (C1-C4) which have different mass ratio of sodium silicate to carrier from 30% to 50% (C1-C3) and the existence of water (C4) were prepared in order to evaluate the effect of the different physical properties on denitrification in sulphur-based autotrophic processes. While the apparent density and the compressive strength decreased as the proportion of sodium silicate increased and water was added in the carriers, the average pore size and the porosity increased from 0.43 to 3.
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