Evaluation of sediment solidification ability using in situ microbial functions in Ichkeul Lake, Tunisia
Evaluation of sediment solidification ability using in situ microbial functions in Ichkeul Lake, Tunisia
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利用原位微生物功能评价突尼斯 Ichkeul 湖沉积物固化能力
DOI：
10.1007/s41207-016-0003-8
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Taichi Tebakari
中科院分区：
文献类型：
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作者：
Toshiro Hata; Mitsuteru Irie; Atsushi Kawachi; Taichi Tebakari
开发生态系统的好处在全球范围内都在争论。突尼斯伊奇凯尔湖世界自然遗产地的水资源管理产生了有害影响。这些担忧增加了人们对天然矿物生产的兴趣。方解石等天然矿物是由原位微生物产生的，被归类为建筑材料。它们被认为是一种可行的替代新资源。本研究的重点是伊奇库尔湖沉积物的物理和生物特性，以及从这些沉积物中的原位微生物中析出方解石的潜力。野外调查的结果主要集中在分布在湖东部的高盐度水生植物(Ruppia Cirrhosa)。这些结果表明，在旱季，廷加海峡周围地区的盐度有所增加。用便携式X射线荧光法(XRF)测定元素含量。伊奇库尔湖沉积物中的钙含量高于日本标准样品。这表明微生物碳酸盐沉淀法适用于伊奇库尔湖。研究了方解石沉淀工艺，如尿素酶产生菌的加速培养等。预培养试验的重点是提高原位细菌的尿素酶活性。研究了利用产尿素酶细菌提高方解石沉淀率所导致的沉淀物固化。所有来自伊奇库尔湖的沉积物样品都能够沉淀方解石。野外调查和室内试验结果表明，在高盐度条件下，经过1个月的养殖期后，朱敏河河口附近地区方解石的沉降率有所提高。
The merit of exploiting ecosystems is debated globally. There have been harmful effects due to water resource management of the world natural heritage site at Lake Ichkeul, Tunisia. These concerns have increased the interest in the production of natural minerals. Natural minerals, such as calcite, are produced from in situ microorganisms and are categorized as construction materials. They are considered to be a viable alternative new resource. This study focused on the physical and biological properties of sediments from Ichkeul Lake and the potential of calcite precipitation from in situ microorganisms in these sediments. The results of field investigations focused on high-salinity aquatic plants (Ruppia cirrhosa) that were distributed in the eastern portion of the lake. These results show that the area around the Tinja channel had increased salinity in the dry season. The element contents were measured with portable X-ray fluorescence (XRF). Ichkeul Lake sediments had higher calcium content than standard Japanese samples. This suggests that microbial carbonate precipitation is applicable to Ichkeul Lake. Calcite precipitation techniques, such as acceleration of urease-producing bacteria, were studied. Pre-cultivation tests focused on increasing urease activity rates from in situ bacteria. Solidification of sediment resulting from enhanced calcite precipitation rates through use of urease-producing bacteria was examined. All of the sediment samples from Ichkeul Lake were able to precipitate calcite. The results of the field investigation and laboratory tests indicated that the area around the mouth of the Joumine River showed an enhanced calcite precipitation rate after a cultivation period of 1 month under high-salinity conditions.