城市内河生物修复及其对底泥氮素转化影响的实验研究

对在城市内河底泥有机质与有机氮含量高的特殊环境下进行水体修复的可行性与修复方法进行了探讨.富含高有机氮的城市内河底泥是氮素的重要释放源,采用向水体曝气可以有效地促使总氮与NH3-N的降解,与未曝气相比,10 d后曝气条件下二者的去除率分别达到81%和92%;此时再以土著水生植物进行修复可以显著地提高水体修复的效果、稳定性与修复成功率,并使总氮、NH3-N维持在1 ms/L和0.5 ms/L以下.但应避免城市内河有效光辐射的减少对水体修复影响.

Experimental study on bioremediation of city river and its effects on transformation of nitrogen in sediments

The feasibility and procedures of bioremediation in city river with special high concentration of org-N and org-C in sediments were studied.The most important source of the N-release is the decomposition of org-N. Aeration of river water can promote degradation of TN and NH₃-N.Comparing with river water which is not aerated,the removal rates of TN and NH₃-N can reach 81% and 92% in aerated water.At this point bioremediation with indigenous aquatic plants can get good results and high success rate.The concentration of TN and NH₃-N can keep lying below 1 mg/L and 0.5 mg/L.The reduction of effective optical radiation must be avoided in bioremediation.