盐度变化对SBBR和SBR中含氨氮废水的处理影响

针对含氨氮高盐废水,研究了逐步提高盐度(以Cl-离子浓度计)对内循坏SBBR和SBR中硝化和反硝化作用的影响,以及当盐度降为0后的恢复过程.结果表明,在内循坏SBBR和SBR中,随着盐度的逐步提高,亚硝化过程都会受到影响,当盐度<1.0×104mg.L-1时,SBBR中的氨氮降解速率小于SBR,从1.5×104mg.L-1开始SBBR中的氨氮降解速率大于SBR,当盐度提高为4.0×104mg.L-1时,两者的亚硝化过程都受到极大抑制;SBBR在盐度为1.5×104mg.L-1时即持续有NO2--N累积,而在SBR中,当盐度提高为2.5×104mg.L-1时,反应周期末才开始持续有大量的NO2--N累积;在SBBR中,当盐度低于1.5×104mg.L-1时,TN去除率达到60%左右,当盐度>3.0×104mg.L-1时,同步硝化反硝化过程受到较大抑制.

Effects of Salinity Variation on the Treatment Wastewater Containing Ammonia in the SBBR and SBR

According to nitrogen-containing wastewater, effects of salinity variation on nitrification and denitrification in internal circulation sequencing batch biofilm reactor (SBBR) and sequencing batch reactor (SBR), and the process of recovery as decreased salinity were investigated. The results show that nitrosation process is effected in internal circulation SBBR and SBR as the increase of salinity, and as the salinity is less than 1.0 × 10~4 mg·L~(-1), the speed of ammonia-oxidize is quicker in the SBR than in the SBBR, but the state is opposite as the salinity beyond 1.5 × 10~4 mg·L~(-1) . As the salinity increased to 4.0 × 10~4 mg·L~(-1), the process of ammonia-oxidize was restrained strongly both in SBBR and SBR. The nitrite accumulation is attained continually as the salinity at 1.5 × 10~4 mg·L~(-1) and 2.5 × 10~4 mg·L~(-1) in the SBBR and SBR respectively. In the SBBR, the removal rate of TN was about 60% as the salinity was less than 1.5 × 10~4 mg·L~(-1), and the SND was restrained strongly as the salinity beyond 3.0 × 10~4 mg·L~(-1).