生物炭-海藻酸钠联合固定化小球藻去除水中的氨氮

Removal of ammonia nitrogen by biochar-alginate-jointly immobilized Chlorella Vulgaris

以海藻酸钠为包埋材料,生物炭为添加剂,固定小球藻,制得生物炭-海藻酸钠联合固定化小球藻胶球,并将其用于水中氨氮的去除。实验结果表明:生物炭-海藻酸钠联合固定化小球藻具有生物炭吸附和小球藻吸收协同作用,促进了小球藻的生长和水中氨氮的去除,且氨氮的去除率随着胶球加入量和胶球粒径的增加而提高。生物炭-海藻酸钠联合固定化小球藻胶球制备最优方案为:生物炭浓度为0.26 g·L^-1、海藻酸钠质量分数为1.8%、胶球中藻细胞密度为3.0×10^6个·mL^-1、CaCl2质量分数为1%;胶球重复使用一次的氨氮去除率可达66.87%。生物炭促进了固定化微藻对高浓度氨氮废水的资源化利用。

Chlorella Vulgaris was immobilized in the embedding material of sodium alginate beads with additive of biochar, this biochar-alginate-jointly immobilized C. Vulgaris was used to remove ammonia nitrogen from water. The results showed that this biochar-alginate-jointly immobilized C. Vulgaris exerted the synergistic effects of biochar adsorption and C. Vulgaris uptake, and promoted C. Vulgaris growth of and ammonia nitrogen removal. The removal rate of ammonia nitrogen increased with the increase of the addition amount and diameter of biochar-alginate-jointly immobilized C. Vulgaris beads. The optimum conditions for preparation of the beads were as follows: biochar concentration of 0.26 g·L^-1, sodium alginate mass fraction of 1.8%, C. Vulgaris density embedded in beads of 3.0×10^6 cells·mL^-1 and CaCl2 mass fraction of 1%, and ammonia nitrogen removal rate of recycled beads could reach 66.87%. Biochar promoted the resource utilization of high concentration ammonia nitrogen wastewater by immobilized microalgae.