厌氧-好氧组合工艺处理垃圾渗滤液短程硝化的二次启动

THE SECOND STARTUP OF THE SHORT-CUT NITRIFICATION OF LANDFILL LEACHATE BY THE ANAEROBIC-AEROBIC PROCESS

采用"两级UASB-A/O"组合工艺处理实际高氨氮城市生活垃圾渗滤液,对反应器二次启动的方法和影响因素进行了分析与考察。试验结果表明,通过逐步提高两级UASB的有机负荷,并创造有利于厌氧消化的温度、pH、碱度和VFA等条件,在较短的时间内使得两级UASB内颗粒污泥的SS、VSS、VSS/SS、沉降速率和平均粒径呈阶段性增加,生物活性得到迅速恢复;以FA为主要控制因素,创造适宜的温度、pH、碱度和DO等其它条件,并辅以过程控制,使得A/O系统中的NO2--N累积率从启动初期的19.4%上升到90%的短程硝化并得以稳定维持。兼顾两类生化系统使其达到相互协调而且优势互补的状态,6周内即完成反应器的启动,在平均进水NH4+-N、TN质量浓度和COD分别为2 315、2 422、12 800 mg.L-1的条件下,去除率分别可达99%、87%、92%,能同时实现有机物和氮的高效深度去除。

A system consisting of a two-stage UASB and anoxic-oxic reactor was used to enhance COD and nitrogen removal from landfill leaehate, focusing on methods and influencing factors of the second startup of the reactor. The results showed that： the SS, VSS, VSS / SS, settlement rate and the average particle size of the granular sludge in the two UASB rise periodically and the activity was resumed in a relatively short term through gradually in.creasing the organic loading and creating conducive conditions for anaerobic digestion such as temperature, pH, alkalinity, VFA and so on.NO2-N acGumulation rate from the initial 19.4% increases to 90% in A/O system and remains stable with FA as the main controlling factor, and creating an appropriate temperature, pH, alkalinity, DO, and other conditions. By means of creating conditions to make the anaerobic and aerobic biological systems reach coordination and complementarity the reactor startup is completed in 6 weeks. COD and nitrogen was removed simultaneously and effectively by the biological system, the average removal efficiency of NH4＋-N, TN and COD are up to 99%, 87%, 92%, respectively. When the average influent NH4＋-N, TN concentrations and COD were 2 315 mg.L-4, 2 422 mg.L-1 and 12 800 mg.L-1.