Abstract

Immobilized microalga Chlorella sp. Wu-G23 (G23) was entrapped inside a polymer matrix or appended on the surface of a strong solid carrier. Alginates then formed a microalgae/polymeric matrix granule within the cross-linking solution. The textile wastewater bioremediation technology using immobilized G23 in textile wastewater effectively removed chemical oxygen demand (COD), ammonium nitrogen (NH₄⁺-N) and color after 7 days of cultivation. Batch model results show that the optimal cultivation parameters for simultaneously removing textile wastewater pollutants and accumulating lipids were initial pH 10 with extra urea 1 g/L and K₂HPO₄ 8 mg/L added without aeration. A bioreactor cultivated the immobilized G23 at hydraulic retention time of 48 h with continuously fed textile wastewater for 440 h. Peak removal efficiencies of NH₄⁺-N 80.2%, COD 70.8% and color 77.9% with fatty acid methyl esters 10% were achieved. The color removal occurred through the biosorption mechanism using nonviable suspended and immobilized microalgae biomass. The NH₄⁺-N and COD could be degraded in the cell-free, nonviable microalgae because the microorganism in the textile wastewater could utilize them as a nutrient source.

Graphic abstract

中文翻译：

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固定化小球藻对纺织品废水的生物修复。Wu-G23具有连续文化

摘要

固定化微藻小球藻藻。Wu-G23（G23）被截留在聚合物基质内部或附着在坚固的固体载体表面。然后藻酸盐在交联溶液中形成微藻/聚合物基质颗粒。培养7天后，在纺织品废水中使用固定化G23的纺织品废水生物修复技术有效去除了化学需氧量（COD），铵态氮（NH ₄ ⁺ -N）和色素。批处理模型结果表明，同时去除纺织品废水污染物和积累脂质的最佳培养参数为初始pH 10，额外尿素1 g / L和K ₂ HPO ₄添加8 mg / L，不充气。生物反应器在48 h的水力停留时间下，用连续进料的纺织废水培养440 h来固定化的G23。使用10％的脂肪酸​​甲酯可获得NH ₄ ⁺ -N 80.2％，COD 70.8％和色度77.9％的峰去除效率。通过使用不可行的悬浮和固定化微藻生物质的生物吸附机制进行了脱色。NH ₄ ⁺ -N和COD可以在无细胞，无生命的微藻中降解，因为纺织废水中的微生物可以利用它们作为营养源。

图形摘要