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为了探讨废水浓度对青萍(Lemna minor)净化能力、生物质和能量积累能力的影响,以猪场养殖废水为供试废水,分析了在不同废水浓度下青萍对废水中总氮(TN)、氨氮和总磷(TP)的净化能力,青萍的生长情况,以及青萍中碳(C)、氮(N)、磷(P)元素含量和热值的变化情况。研究表明,青萍在1%浓度的废水中表现出最高的污染物净化能力。虽然青萍的C、N、P含量和热值均随废水浓度的增加而增加,但是由于相对增长率以1%的废水中生长的青萍最高,青萍的最高生产力、C和能量的固定能力均出现在1%废水浓度培养的青萍中,其次是5%废水浓度培养的青萍。多项式回归分析表明,可以使青萍获得最大C和能量固定能力的废水浓度为3.4%,对应的氨氮浓度为26 mg/L,TP浓度为3.4 mg/L。研究结果为进一步优化高生物质生产、高污染物去除率的养殖废水-浮萍培养体系提供了一定的基础。
In order to investigate the effect of wastewater concentration on Lemna minor purification ability, biomass and energy accumulation capacity, using farm wastewater as test wastewater, , The purifying ability of ammonia nitrogen and total phosphorus (TP), the growth of Qingping and the content of carbon (C), nitrogen (N), phosphorus (P) Studies have shown that Qing Ping showed the highest pollutant purifying ability in 1% concentration wastewater. Although C, N and P contents and caloric values of Qingping increased with the increase of wastewater concentration, the highest productivity of Cingjing and the fixed C and energy were obtained due to the highest relative growth rate of Qingping with 1% The abilities were all appeared in Qingping cultivated in 1% wastewater concentration, followed by Qingping cultivated in 5% wastewater concentration. Polynomial regression analysis showed that the concentration of wastewater that led to the maximum C and energy fixation capacity of Qingjian was 3.4%, the corresponding ammonia nitrogen concentration was 26 mg / L and the TP concentration was 3.4 mg / L. The results provide a basis for further optimization of culture wastewater-duckweed culture system with high biomass production and high pollutant removal rate.