Removal of Sodium from Seawater Medium Using Photosynthetic Bacteria

• 作者: Kei Sasaki Ken Sasaki Kenji Takeno Yuichiro Hosokawa
• 来源期刊: 农业化学和环境(英文)
• 学科: 医学
• 关键词: Removal of SODIUM Marine PHOTOSYNTHETIC BACTERIA Desalinization REPLACEMENT Culture Liquid FERTILIZER
• 年，卷（期）: 2017,（3）
• 页码范围: 133-143
• 页数: 11页
• 分类号: R73

摘要

The removal of sodium (Na) from seawater using two photosynthetic bacteria was investigated using Rhodobacter sphaeroides SSI (SSI) and Rhodovulum sp. which is a marine photosynthetic bacterium. Both Rhodovulum sp. and acclimated SSI were shown to grow well in a 3% NaCl supplemented glutamate-malate medium. The maximum rate of Na removal was 39.3% by SSI and 64.9% by Rhodovulum sp. after two days cultivation under static light conditions. However, Na was re-released back into the medium after two to three days. When a nutrient-supplemented seawater medium (3.3% NaCl, 13.10 gNa/l) was used, the maximum Na removal rates were 30.3% (9.05 gNa/l) by SSI and 48.9% (6.69 gNa/l) by Rhodovulum sp., under static light conditions. Similar growth and Na removal rates were found under aerobic dark cultivation. In this case, no re-release of Na was observed with either bacterium. Two stages culturing was conducted first, with Rhodovulum sp. and then with SSI replacement. The Na concentration was reduced to 0.79 gNa/l (94.0% removal) after cultivation for eight days under aerobic darkconditions. The supernatant was applied successfully as a liquid fertilizer in the cultivation of Japanese radish.