浮萍净化与资源化利用沼液初步研究

Initial Study on Purification and Resource Utilization of the Biogas Slurry by Duckweed

[目的]初步研究浮萍净化和资源化利用沼液的可行性。[方法]以紫背浮萍和青萍为研究对象,在不同稀释倍数的沼液中培养,研究浮萍对沼液中氮、磷和COD的净化去除能力和沼液浓度对其生长的影响。[结果]紫背浮萍在稀释10倍的沼液中、青萍在稀释15倍的沼液中生长及对氮、磷的净化效果最好。紫背浮萍在稀释20倍的沼液中、青萍在稀释15倍的沼液中生长及对COD的净化效果最好。此外,浮萍能够有效抑制藻类的生长。[结论]该研究为浮萍净化沼液同时生产鱼类饵料等实现资源化利用提供科学依据。

[ Objective ] The research aimed to study feasibility for purification and resource utilization of the biogas slurry by duckweed. [ Method ] Lemma polyrhiza L. and Lemma minor L. as study objects, cultivating in biogas slurry at different dilution times, purification ca- pacities of the duckweed on N, P and COD in biogas slurry and influence of the biogas slurry concentration on its growth were studied. [ Re- sult] L. polyrhiza in diluted 10-fold biogas slurry and L. minor in diluted 15-fold biogas slurry had the best growth and purification effect on N and P. L. polyrhiza in diluted 20-fold biogas slurry and L. minor in diluted 15-fold biogas slurry had the best purification effect on COD. In addition, duckweed could effectively inhibit algae growth. [ Conclusion] The research provided scientific basis for purifying biogas slurry and producin~ fishes bait by duckweed.