- Thesis topic: Recovery of Cerium from Industrial Waste Incinerator Ash using Liquid to Liquid Extraction

- Doi: https://doi.org/10.6840/cycu202100908

- Abstract: 

      Ammonia, a colorless gas with a distinct odor, is a building-block chemical that is used in the production of many everyday products. It occurs naturally in the environment, including the air, soil, and water, as well as in plants and animals, including humans, and widely used in industries and commerce. The presence of ammonium ions is one of the main concerns for human health and the environment. Recovery of ammonia from wastewater is a solution to both problems because it allows us to remove ammonia from wastewater and safely discharge it into the environment while also recovering ammonia as a raw material for industrial processes. For the recovery of ammonia, DCMD was used for the treatment of high ammonia content wastewater. The separation media were PTFE+PP, with seven parameters including pH 9-13, feed concentration 100- 10000 ppm, feed temperature 25-65℃, feed flow rate 1-3 L/min and receiver concentration 0-60000 ppm and receiver flow rate was 1-3 L/min to discuss the influence of ammonia separation factor (St), mass transfer coefficient (Kov), average ammonia flux (J), removal efficiency, and recovery ratio respectively. Testing demonstrated that the effect of different parameters on ammonia separation factor (St), feed pH, and feed concentration are the most important factors with the influence of 50.4% and 12.8% separately. For mass transfer coefficient (Kov), the most important factors are feed pH and feed concentration, too. With the influence of 53.7% and 25.6% separately, The removal rate of ammonia with real wastewater is 96 percent and the recovery rate is 88 percent in 16 hours immediately and increasing the concentration of ammonia more than 1%. 
        Keywords: Ammonia, Recovery, Removal, DCMD