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START-UP OF A NEW MULTI-POINT INFLUENT A2/O PROCESS TO REMOVE NITROGEN AND PHOSPHORUS IN WASTEWATER WITH LOW CARBON TO NITROGEN RATIO
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摘要: 针对解决传统A2/O工艺处理低C/N污水中的一些不足以及在脱氮除磷中效率低的问题，提出1种新型分点进水改良A2/O工艺，采用污泥接种启动方法，在无外加碳源情况下，以实际生活污水为处理对象，重点对挂膜启动过程进行分析研究。结果显示：分点进水改良A2/O工艺，在好氧池悬浮填料填充率为30%，ρ（DO）为1.5~3.0 mg/L，污泥浓度为2.5~3.0 g/L运行条件下，21 d可完成系统启动，对COD、NH4+-N、TN、TP去除率分别为90.08%、91.31%、61.67%和87.31%。分点进水改良A2/O工艺可以克服传统A2/O工艺在脱氮除磷过程中碳源的限制，在系统快速挂膜启动同时，能够对氮、磷有着较高的处理效果，出水水质稳定达到GB 18918-2002《城镇污水处理厂污染物排放标准》一级A标准。Abstract: Aiming at solving the problems of the traditional A2/O process in treating wastewater with low C/N ratio and its low efficiency in nitrogen and phosphorus removal, a new multi-point-influent improvement A2/O process was proposed, and started with sludge inoculation. In the case of no additional carbon source, the actual domestic wastewater was used, and analysis on the start-up process of the membrane was conducted. The results showed that when the A2/O process was improved by sub-water feed, the filling rate of the suspended filler in the aerobic tank was 30%, and the DO was 1.5~3.0 mg/L, the start-up was completed in 21 days. Then the removal rates of COD, NH4+-N, TN and TP were 90.08%, 91.31% and 61.67% and 81.37%, respectively. This improved A2/O process by sub-water feed can overcome the limitation of carbon source shortage in the process of nitrogen and phosphorus removal. This new process realized the fast start-up and showed a higher treatment effect on nitrogen and phosphorus, and the water quality reached the Grade A standard of the Pollutant Discharge Standard for Urban Wastewater Treatment Plants (GB 18918-2002).
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