反硝化细菌修复城市黑臭河道底泥实验研究

实验室条件下,以南宁市朝阳溪黑臭底泥和水体为研究对象,采用投加反硝化细菌制剂的底泥生物修复方法,探索反硝化细菌投加量对底泥修复效果的影响。结果表明:对比4组不同反硝化细菌投加量的实验,当反硝化细菌投加量为0.5 g/m3时,6周后,底泥厚度降低了3.43 cm,有机质降解率为13.6%,生物降解能力(G值)增长280.8%,表层氧化层接近0.7 cm,各指标25 d后基本趋于稳定,对底泥的修复效果较佳。当反硝化细菌投加量为0.25 g/m3时,6周后,上覆水COD、NH3-N、TN和TP的去除率分别为76.5%、94.4%、87.8%和79.4%,水质有较大改善。

EXPERIMENTAL STUDY ON REMEDIATION OF SEDIMENTS IN URBAN BLACK-ODOROUS RIVERS BY DENITRIFYING BACTERIA

The effects of denitrifying bacteria dosage on the bioremediation of sediments were explored． The sediments，as well as water samples，taken from Chaoyang Creek in Nanning with four different dosages of denitrifying bacteria were studied under laboratory conditions． The results showed that the dosage of denitrifying bacteria at 0. 5 g /m3 had better bioremediation effect of sediments than other three dosages after 6 weeks，the sediment thickness decreased 3. 43 cm，removal efficiency of organic matters was 13. 6%，growth rate of G was 280. 8%，the oxide layer was about 0. 7 cm，every indexes achieved stability after 25 days． The dosage of denitrifying bacteria at 0. 25 g /m3 was better than others to improve water quality，the removal rates of COD，NH3－N，TN and TP in overlying water reached 76. 5%，94. 4%，87. 8% and 79. 4% respectively after 6 weeks．