Aragonite undersaturation in Gwangyang Bay,South Korea: Effects of fresh water input     

Dongseon Kim  Eun-Jin Yang  Seung Ho Baek  Kyung-Hee Kim  Jin-Hyun Jeong  Young-Ok Kim 《Ocean Science Journal》2014,49(3):223-230

Dissolved inorganic carbon (DIC) and alkalinity were precisely measured for surface and bottom waters in Gwangyang Bay, Korea, during the four seasons to assess seasonal variations of aragonite saturation state (Ω_arag). Both the surface and bottom waters were undersaturated with respect to aragonite during summer but were supersaturated during the other seasons. The summertime undersaturation of the surface waters with respect to aragonite may have been a result of the dilution effect caused by higher seasonal river runoff. In the bottom waters, the average DIC concentration increased by 40.6 μmol kg^?1 from spring to summer, while the average alkalinity decreased by 74.7 μeq kg^?1. As a result, the alkalinity/DIC ratio decreased from 1.07 in spring to 1.01 in summer and pH also decreased from 7.91 to 7.48, which resulted in the summertime undersaturation of the bottom waters.  相似文献   

Treatment of synthetic acid mine drainage using rice wine waste as a carbon source     

Gyoung-Man Kim  Dae-Hoon Kim  Jung-Seock Kang  Hwanjo Baek 《Environmental Earth Sciences》2014,71(10):4603-4609

Spent mushroom compost (SMC) is commonly used as a carbon source for passive treatment systems in South Korea; however, it has some drawbacks, such as sulfate release from itself. Consequently, investigations to identify effective substitutes for SMC are necessary. In this study, batch experiments were conducted for 27 days to evaluate the efficiency of rice wine waste (RWW) for reducing sulfate and removing dissolved metals within synthetic acid mine drainage (AMD). The results showed that RWW could be more suitable than SMC, which even released sulfate in the early stage of the experiment, for sulfate reduction by sulfate-reducing bacteria. Both materials produced similar results with respect to the removal of dissolved metals, such as Fe and Al. Furthermore, a mixture of SMC and RWW showed the greatest efficiency in sulfate removal. Overall, both RWW and the mixed carbon source showed comparable performance to SMC, which indicated that RWW had a great potential for use as a carbon source for AMD treatment.  相似文献