||Recycling for important task to environmental protection, to reduce dissolved metal rewinded into the process of the conversion of the Basic Oxygen Furance slag (BOF slag) quantity, BOF slag of blast furnace to produce iron water transportation to converter, converter to produce liquid add lime as raw materials such as fertilizer, to remove impurities in the molten iron to form a liquid steel, the byproduct produced by this process, by releasing the elements of the BOF slag, can promote the growth of algae, fixation, at the same time can be used as algae can make converter recycling, stable Marine ecology, improve productivity, and after Carbonated BOF slag (CBOS) have modification can reduce the BOF slag collapse and maintain stability.|
The purpose of this experiment is to determine the presence of CBOS, carbon dioxide (CO2) supplement, or sodium bicarbonate (NaHCO3) for the cultivation of Sargassum duplicatum in order to understand the interactive effects of the carbonate rock of converter and supplementary carbon source for Sargassum duplicatum growth.
The results indicate that BOF slag can help the growth of macroalga effectively, which is an example of the development of the recycling of BOF slag for marine ecology. In terms of relative growth, the presence of CBOS helps the growth of S. duplicatum. Carbon dioxide supplementation was effective in the growth of S. duplicatum in the presence of CBOS. However, the growth of S. duplicatum for carbon dioxide alone was low, possibly due to restriction of the amount of carbon dioxide by the use of pH controller to pH 7.8. However, when both CBOS and carbon dioxide are added together, the growth of S. duplicatum was significantly facilitated. In the other group, compared to S. duplicatum without any supplements, the addition of sodium bicarbonate alone was helpful for S. duplicatum growth, which was similar to CBOS alone treatment. But, the S. duplicatum growth of CBOS supplemented with sodium bicarbonate was lower than CBOS alone, and also lower than bicarbonate alone. It reflects that the interaction of CBOS and bicarbonate was negative for S. duplicatum growth.
Compared with CBOS-free group, the metal contents in CBOS treatment were similar, indicating that CBOS will not release extra heavy metals for the absorption S. duplicatum. On the contrary, S. duplicatum treated with sodium bicarbonate alone contained high potassium (K) and calcium (Ca), both of which were harmless elements. Therefore, CBOS does not cause heavy metal accumulation in S. duplicatum.
Carbon and nitrogen element are related to the growth of S. duplicatum. Among all treatments, the presence of bicarbonate in CBOS group, S. duplicatum showed low carbon and nitrogen contents. It reflects that low S. duplicatum growth ability of the treatment of CBOS and bicarbonate supplement.
In conclusion, CBOS helps S. duplicatum grow, while carbon dioxide supplementation with CBOS can largely increase S. duplicatum growth, but bicarbonate upplementation with CBOS showed inhibitory effect on S. duplicatum growth.