3AMBR工艺处理城市污水节能降耗的中试实验

为探索 MBR 污水厂切实可行的节能途径，构建了处理规模为1 m3·h-1的3AMBR（anoxic-anaerobic-anoxic membrane bio-reactor）工艺中试实验系统，以曝气量、回流比及进水方式等参数为研究对象，优选了4套方案，进行了超过200 d的现场实验。实验期间，各方案出水水质良好，优化方案的脱氮效率提高明显。当减少曝气，使好氧池在低溶氧（DO-1）状态下运行，仍可保证系统出水的稳定达标排放；提高膜池液向好氧池的回流，使膜池的富余溶解氧得到了利用，达到了部分或完全替代曝气的效果，且获得了更好的脱氮能力；多点进水（比例为2∶2∶1）降低了系统前端的污染负荷，合理分配了碳源，使系统对含氮污染物等的去除能力提高，虽然总体能耗无显著变化，但处理能力的增强明显提升了能效。

Pilot test of 3AMBR in municipal sewage treatment based on energy consumption and energy saving

In order to study practical methods for achieving energy savings in sewage treatment plants employing membrane bio-reactor (MBR) technology, the treatment of urban sewage in an anoxic-anaerobic-anoxic membrane bio-reactor (3AMBR) was studied in a pilot plant with a treatment capacity of 1 m3·h-1. Four typical operation processes were selected for detailed analyses of important operation conditions such as aeration, reflux ratios, and step feeding. Results showed that all of the schemes could achieve excellent water quality, and after reforming the system, the removal of nitrogen was significantly improved. By reducing the concentrations of dissolved oxygen (DO -1) in the aerobic tank, this ensured the effluent standard and stability of water quality. The flow from the membrane tank to the aerobic tank was improved to make full use of the high DO in the membrane tank mixed liquor; the results showed that oxygen in the refluxed liquid could partially or completely replace the need for aeration, and this change also resulted in better removal of nitrogen. Setting up step feeding (at a ratio of 2:2:1) improved denitrification in the rear anaerobic tank. At the same time, reasonable distribution of carbon sources was achieved in line with quality requirements when the use of aeration was decreased. Energy consumption of the overall system did not change significantly with these modifications; thus, we were able to enhance the system's processing capacity while significantly increasing the energy efficiency.