摘要
以低C/N实际生活污水为处理对象,重点考察了N-SBR单元硝化时间分配比对A2N2系统运行性能的影响。在A_2/O-SBR单元厌氧1.5 h,缺氧2 h,好氧0.5 h,A^2/O-SBR和N-SBR单元的曝气量分别恒定在100、120 L·h^(-1)的条件下,将硝化时间分配比分别设定为5:1、4:1、3.5:1、3:1、7:1、8:1进行试验。结果表明,系统在A^2/O-SBR单元可实现碳源的高效利用,有机物的去除受硝化时间分配比影响不大;为保证系统良好的硝化和反硝化除磷性能,一次硝化时间必须≥3.5 h;在总曝气时间一定的条件下,适当增加一次硝化时间,更有利于提高系统TN去除率;适当增加二次硝化时间,可以降低出水4NH-N+浓度,使出水达标排放。当硝化时间分配比为4:1时,系统脱氮除磷效果最好。TN、34PO-P-平均出水浓度分别为11.5、0 mg·L^(-1),平均去除率分别为75%、100%。
A novel A2N2 system was developed to deal with low C/N domestic wastewater. The operating performance under different nitrification duration distribution ratio in N-SBR unit was investigated. The experiment was conducted as follows： under the condition of A2/O-SBR unit anaerobic was set as 1.5 h, anoxic 2 h, aerobic 0.5 h and the aeration flow rate of A2/O-SBR and N-SBR units was 100 and 120 L·h（-1）, respectively, and then the nitrification time distribution ratios were set as 5：1, 4：1, 3.5：1, 3：1, 7：1 and 8：1 to determine the optimal operation parameter. The results indicated that the efficient utilization of carbon sources was achieved in the A2/O-SBR unit, while the nitrification duration distribution ratio had little impact on the removal of organic substances. In order to ensure a better nitrification and denitrification and phosphorus removal performance, the first nitrification duration time must be ≥3.5 h. Under the condition of total nitrification time was unchanged, an appropriate increase in the first nitrification time would greatly improve the system TN removal. An appropriate increase in the secondary nitrification time can reduce the effluent 4NH-N＋ concentration to meet the first A discharge standard in China（GB 18918—2002）. When nitrification time allocation ratio was 4：1, the system achieved the optimal nitrogen and phosphorus removal performance with average effluent concentrations of TN and PO_4（3-）-P of 11.5 and 0 mg·L（-1）, respectively, and the corresponding average removal efficiency was 75% and 100%, respectively.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2016年第12期5259-5267,共9页
CIESC Journal
基金
国家自然科学基金项目(51578014)
北京市教委资助项目
关键词
低C/N生活污水
反硝化除磷
A2N2系统
同步脱氮除磷
硝化时间分配比
low C/N ratio domestic wastewater
denitrifying phosphorus removal
A2N2 system
simultaneous biological nitrogen and phosphorus removal
nitrification duration distribution ratio
