Effect of nitrification duration distribution ratio in N-SBR unit on performance of A2N2 system operation

doi:10.11949/j.issn.0438-1157.20160861

Abstract

Abstract:

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 NH₄⁺-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 PO₄^3--P of 11.5 and 0 mg·L^-1, respectively, and the corresponding average removal efficiency was 75% and 100%, respectively.

Key words: low C/N ratio domestic wastewater, denitrifying phosphorus removal, A₂N₂ system, simultaneous biological nitrogen and phosphorus removal, nitrification duration distribution ratio

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A²/O-SBR单元厌氧1.5 h，缺氧2 h，好氧0.5 h，A²/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A²/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、PO₄^3--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%。

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

CLC Number:

X703.1

WANG Meixiang, ZHAO Weihua, HUANG Yu, PAN Cong, PENG Yongzhen, WANG Shuying. Effect of nitrification duration distribution ratio in N-SBR unit on performance of A₂N₂ system operation[J]. CIESC Journal, 2016, 67(12): 5259-5267.

王梅香, 赵伟华, 黄宇, 潘聪, 彭永臻, 王淑莹. N-SBR单元硝化时间分配比对A₂N₂系统运行性能的影响[J]. 化工学报, 2016, 67(12): 5259-5267.

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Effect of nitrification duration distribution ratio in N-SBR unit on performance of A₂N₂ system operation

N-SBR单元硝化时间分配比对A₂N₂系统运行性能的影响

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