Aqueous silica removal from agricultural drainage water and reverse osmosis concentrate by brackish water diatoms in semi-batch photobioreactors
Aqueous silica removal from agricultural drainage water and reverse osmosis concentrate by brackish water diatoms in semi-batch photobioreactors
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半间歇式光生物反应器中微咸水硅藻去除农业排水和反渗透浓缩水中的水二氧化硅
DOI：
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发表时间：
2017
影响因子：
3.3
通讯作者：
M. A. Anderson
中科院分区：
文献类型：
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作者：
K. Ikehata;Yuanyuan Zhao;N. Maleky;Andrew T. Komor;M. A. Anderson
开发了一种利用天然硅藻进行水和废水处理（特别是水回用和海水淡化）的新型水性二氧化硅去除工艺。含总二氧化硅 39 mg L−1 和总溶解固体 10 g L−1 的咸水农业排水被用作二氧化硅同化硅藻的来源。将排出的水在 500 mL 和 7.5 L 光生物反应器中在 27 ± 2 °C 下静态孵育，并使用两个 13 W 紧凑型荧光灯泡作为光源进行连续照明。 10 天后，褐藻生物量变得明显，二氧化硅开始去除。随着藻类生物量的积累，二氧化硅的去除加速。在第四个半间歇循环中，超过 95% 的钼酸盐活性二氧化硅在 28 小时内被去除。还证实了非反应性二氧化硅的去除。还测试了来自先进水回收设施的高二氧化硅浓度 (>120 mg L−1) 的反渗透浓缩液样品。 6 天内去除了超过 75% 的二氧化硅。显微镜分析揭示了光生物反应器中存在 Pseudostaurosira、Nitzschia 和 Halamphora 物种。据我们所知，这是第一份关于在水处理中使用硅藻去除水相二氧化硅的报告。
A novel aqueous silica removal process using naturally occurring diatoms for water and wastewater treatment, in particular water reuse and desalination, was developed. Brackish agricultural drainage water containing 39 mg L−1 of total silica and 10 g L−1 of total dissolved solids was used as a source of silica-assimilating diatoms. The drainage water was statically incubated in 500-mL and 7.5-L photobioreactors at 27 ± 2 °C under continuous illumination using two 13-W compact fluorescent light bulbs as a light source. After 10 days, brown algal biomass became noticeable and silica removal started to occur. Silica removal accelerated as algal biomass accumulated. In the fourth semi-batch cycle, more than 95 % of molybdate reactive silica was removed within 28 h. Removal of nonreactive silica was also confirmed. Reverse osmosis concentrate samples from advanced water reclamation facilities with high silica concentration (>120 mg L−1) were also tested. More than 75 % of silica was removed within 6 days. Microscopic analysis revealed the presence of Pseudostaurosira, Nitzschia, and Halamphora species in the photobioreactors. To the best of our knowledge, this is the first report on the use of diatoms for aqueous silica removal in water treatment.