CO2 흡수 및 Struvite 결정화에 Jet Loop Reactor의 적용 연구구

Abstract

Part 1 To investigate the performance of a jet loop reactor with the two-fluid swirl nozzle (TSN), CO2 absorption experiments in an alkaline solution were performed. The experimental results obtained in the reactor were compared with those in a jet loop reactor with the two-fluid conventional nozzle (TCN). In the study, the neutralization time of alkaline solution and the CO2utilization were used as the indice for a comparison of the reactor performance. Due to the swirling flow, the neutralization times of alkaline solutions by CO2inthereactorwiththe TSN were shortened compared with those in the reactor with the TCN. Also, the instantaneous and / or overall CO2removal efficiencies in the reactor with the TSN were higher than those in the reactor with the TCN at the same liquid circulation flow rate. part 2 The characteristics of phosphorus removal from the wastewater containing high concentrations of PO4 3- and NH4 + by struvite formation in a jet loop reactor was investigated. By adding air into the jet loop reactor, the initial pH of the wastewater(pH=7.2) was gradually increased to 8.0 due to the CO2 stripping. As a result, the amount of caustic chemicals added to maintain a desired level of operational pH of 8.5 could be reduced. The molar ratio of Mg:P in the wastewater used was always below 1. Therefore, the magnesium concentration was the limiting factor for struvite formation. To find the effective magnesium source, MgCl2, MgSO4, MgO, MgO+MgCl2, and MgO+MgSO4 were used as a magnesium source. Among these chemicals, MgO+MgSO4 was the most effective in saving the operational cost. Throughout the experiments, a high percentage (89%) of phosphorus removal was achieved when MgCl2 was used as an Mg source. The removal efficiencies of phosphorus in the jet loop reactor with aeration were higher than those in the reactor without aeration.