Ağdağ Osman Nuri, Sponza Delia Teresa
Engineering Faculty, Environmental Engineering Department, Dokuz Eylül University, Tinaztepe-Izmir, Turkey.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2004;39(11-12):2955-72. doi: 10.1081/ese-200034316.
In this study, the effects of intermittent aeration on the anaerobic treatment of domestic solid waste and leachate characteristics were investigated in three simulated landfill anaerobic bioreactors. All of the reactors were operated with leachate recirculation and recirculation rate was 300 mL/d. All the reactors were loaded with solid waste having different operational mode. The first reactor was operated with recirculation (control-no aeration). The second reactor was aerated three days in a week during 1 h (Run 1) and the last reactor was aerated one day in a week during 1 h (Run 2). pH, chemical oxygen demand (COD), volatile fatty acids (VFA), ammonium nitrogen (NH4-N), nitrate nitrogen (NO3-N) concentrations, total, and methane gas productions in the leachate samples were regularly monitored. 96, 85, and 97% COD and 86, 77, and 93% VFA removals were obtained, in the leachate samples of the control, R1 and R2 reactors, respectively, after 79 days of anaerobic incubation. The TN, TP and NH4-N concentrations in MSW reduced to 4300, 1100, and 160 mg/g from 11,100, 2450, and 630 mg/g in R1 reactor by day 79. The values of pH were 6.98, 6.76, and 7.98, respectively, after anaerobic incubation, respectively in the aforementioned reactors. It was observed that the aeration decreased the methane percentage and the quantity in the simulated bioreactor. The maximum cumulative methane gas production was recorded as 11.2, 0.9, and 3.6 L in control, R1 and R2 reactors, respectively, at the end of 79 days. A BOD5/COD ratio of 0.23 achieved in the R2 reactor indicated the better MSW stabilization resulting in a high rate than that of R1 and control reactors. It was observed that the aerated reactor one day in a week during one hour (R2) reduced the COD and VFA concentrations in leachate samples. The aerated reactor three days in a week during 1 h (R1) reduced the waste quantity, the organic content of the solid waste. The final leachate quantities of aerated runs were lower than that of control reactor operated under strictly anaerobic conditions.
在本研究中，在三个模拟垃圾填埋厌氧生物反应器中研究了间歇曝气对生活垃圾厌氧处理及渗滤液特性的影响。所有反应器均采用渗滤液循环运行，循环速率为300 mL/d。所有反应器均装填有不同运行模式的固体废物。第一个反应器采用循环运行（对照——不曝气）。第二个反应器每周曝气三天，每次曝气1小时（运行1），最后一个反应器每周曝气一天，每次曝气1小时（运行2）。定期监测渗滤液样品中的pH值、化学需氧量（COD）、挥发性脂肪酸（VFA）、铵态氮（NH4-N）、硝态氮（NO3-N）浓度、总量以及甲烷气体产量。经过79天的厌氧培养后，对照、R1和R2反应器的渗滤液样品中COD去除率分别达到96%、85%和97%，VFA去除率分别达到86%、77%和93%。到第79天，R1反应器中生活垃圾的总氮（TN）、总磷（TP）和铵态氮（NH4-N）浓度从11100、2450和630 mg/g降至4300、1100和160 mg/g。上述反应器厌氧培养后的pH值分别为6.98、6.76和7.98。观察到曝气降低了模拟生物反应器中甲烷的百分比和产量。在79天结束时，对照、R1和R2反应器的最大累积甲烷气体产量分别记录为11.2、0.9和3.6 L。R2反应器中达到的BOD5/COD比值为0.23，表明生活垃圾的稳定化程度更高，速率高于R1和对照反应器。观察到每周曝气一天、每次曝气1小时的反应器（R2）降低了渗滤液样品中的COD和VFA浓度。每周曝气三天、每次曝气1小时的反应器（R1）减少了废物量，即固体废物的有机含量。曝气运行的最终渗滤液量低于在严格厌氧条件下运行的对照反应器。
