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首页> 外文期刊>Applied Microbiology and Biotechnology >Photosynthetic aeration in biological wastewater treatment using immobilized microalgae-bacteria symbiosis
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Photosynthetic aeration in biological wastewater treatment using immobilized microalgae-bacteria symbiosis

机译：固定化微藻-细菌共生技术处理生物废水中的光合曝气

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摘要

Chlorella vulgaris encapsulated in alginate beads were added into a bioreactor treating synthetic wastewater using Pseudomonas putida. A symbiotic CO2/O-2 gas exchange was established between the two microorganisms for photosynthetic aeration of wastewater. During batch operation, glucose removal efficiency in the bioreactor improved from 50 % in 12 h without aeration to 100 % in 6 h, when the bioreactor was aerated photosynthetically. During continuous operation, the bioreactor was operated at a low hydraulic retention time of 3.3 h at feed concentrations of 250 and 500 mg/L glucose. The removal efficiency at 500 mg/L increased from 73 % without aeration to 100 % in the presence of immobilized microalgae. The initial microalgae concentration was critical to achieve adequate aeration, and the removal rate increased with increasing microalgae concentration. The highest removal rate of 142 mg/L-h glucose was achieved at an initial microalgae concentration of 190 mg/L. Quantification of microalgae growth in the alginate beads indicated an exponential growth during symbiosis, indicating that the bioreactor performance was limited by oxygen production rates. Under symbiotic conditions, the chlorophyll content of the immobilized microalgae increased by more than 30 %. These results indicate that immobilized microalgae in symbiosis with heterotrophic bacteria are promising in wastewater aeration.
机译：将封装在藻酸盐珠粒中的小球藻添加到使用恶臭假单胞菌处理合成废水的生物反应器中。在两种微生物之间建立了共生的CO2 / O-2气体交换，用于废水的光合曝气。在分批操作期间，当生物反应器进行光合作用充气时，生物反应器中的葡萄糖去除效率从不充气的12小时的50％提高到6小时的100％。在连续运行过程中，生物反应器在250和500 mg / L葡萄糖进料浓度下，在3.3 h的低水力停留时间下运行。在存在固定化微藻的情况下，500 mg / L的去除效率从不充气的73％提高到100％。初始微藻浓度对于获得足够的通气至关重要，清除率随微藻浓度的增加而增加。在初始微藻浓度为190 mg / L时，最高去除速率为142 mg / L-h葡萄糖。藻酸盐珠中微藻生长的定量表明，在共生过程中呈指数增长，表明生物反应器的性能受到制氧率的限制。在共生条件下，固定微藻的叶绿素含量增加了30％以上。这些结果表明，与异养细菌共生的固定化微藻在废水曝气中很有前景。

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