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以蕹菜(Ipomoea aquatica)为材料,采用改进的常规耗竭法,对氨氮、硝酸盐氮和无机磷的吸收动力学特性进行了研究。通过室内静态实验测定了蕹菜对富营养化水体的氮磷去除效率。用Michaelis-Menten方程来描述蕹菜对氨氮、硝酸盐氮和无机磷的吸收速率与溶液浓度的相互关系。结果表明:蕹菜对氨氮、硝酸盐氮和无机磷的最大吸收常数Vmax为23.59、2.88和1.52μmol/(g FW.h),亲和力常数Km为1.90、10.94和0.97μmol/L,可见蕹菜对氨氮的吸收速率和亲和力均高于硝酸盐氮,对无机磷的吸收速率较小;蕹菜对富营养化水体总氮、氨氮、总磷和有机磷的去除率分别为38.13%、44.85%、63.77%和53.95%;蕹菜对受试水体表现了良好的适应性和净化能力。
Taking Ipomoea aquatica as material, the absorption kinetics of ammonia nitrogen, nitrate nitrogen and inorganic phosphorus were studied by the improved routine depletion method. Nitrogen and phosphorus removal efficiency of Eutrophicated water was determined by indoor static experiment. The Michaelis-Menten equation is used to describe the relationship between the rate of absorption of ammonia nitrogen, nitrate nitrogen and inorganic phosphorus and the concentration of solution in water spinach. The results showed that the maximum absorption constants Vmax of ammonia nitrogen, nitrate nitrogen and inorganic phosphorus were 23.59,2.88 and 1.52μmol / (g FW.h) respectively, and the affinity constants Km were 1.90,10.94 and 0.97μmol / L, The absorption rate and affinity of ammonia nitrogen were higher than that of nitrate nitrogen, and the absorption rate of inorganic phosphorus was small. The removal rates of total nitrogen, ammonia nitrogen, total phosphorus and organic phosphorus in eutrophic water were 38.13%, 44.85% , 63.77% and 53.95%, respectively. The water cabbage exhibited good adaptability and purification ability to the tested water.