活性污泥微生物对苯胺废水的降解研究

Study on Degradation of Aniline by Activated Sludge Microorganism

利用序批式反应器(SBR)对活性污泥进行培养和驯化,分别取未经驯化和经盐驯化后的活性污泥,通过批量实验研究了两种污泥中微生物对苯胺的降解效果。SBR运行结果表明,活性污泥经过驯化适应了10gNaCl/L后,取得较高的COD、NH_4^+-N和TN的去除率,分别为86.5%、97.6%和96.4%。批量实验结果表明,苯胺降解速率随初始苯胺浓度的升高逐渐增加,且苯胺降解速率在未驯化污泥无盐条件下高于盐驯化污泥加盐条件,分别为2.63~21.31和2.06~12.08mg/(gVSS×h);未投加苯胺时,COD和NH_4^+-N的降解速率是投加苯胺时的5.2~19.3和2.5~4.2倍,且未驯化污泥无盐条件下COD和NH_4^+-N的降解速率是盐驯化污泥加盐条件的2.4和1.5倍;投加苯胺后,COD的降解速率随苯胺浓度的升高逐渐增加;实验结束时,未驯化污泥无盐条件下只存在NO-3-N,而盐驯化污泥加盐条件下同时存在NO-2-N和NO-3-N。

Sequencing batch reactor(SBR)was used to cultivate and acclimate activated sludge,unacclimated and salt acclimated sludge were taken out from the reactor to study the degradation effect of microorganisms on aniline by batch experiments.The results showed that after the sludge acclimated to 10 g NaCl/L,removal efficiencies of COD,NH+4-N and TN were 86.5%,97.6%and 96.4%in the SBR,respectively.The results in batch experiments showed that the degradation rate of aniline increased gradually with the increase of initial concentration of aniline.In the test with unacclimated sludge and without salt,the degradation rate of aniline was higher than that in the test with salt acclimated sludge under saline conditions.In the test without aniline addition,degradation rates of COD and NH+4-N were much higher compared to the condition of adding aniline.The degradation rates of both COD and NH+4-Nwithunacclimated sludge and without salt was significantly higher than that with acclimated sludge and with salt.When adding aniline,the COD degradation rate increased gradually with the increase of the concentration of aniline.At the end of experiments,both NO-2-N and NO-3-N were found in acclimated sludge under saline conditions,however,only NO-3-N was detected in the test with unacclimated sludge.