Uygur Ahmet, Kargi Fikret
Department of Environmental Engineering, Dokuz Eylul University, Buca, Izmir, Turkey.
J Environ Manage. 2004 May;71(1):9-14. doi: 10.1016/j.jenvman.2004.01.002.
Biological treatment of landfill leachate usually results in low nutrient removals because of high chemical oxygen demand (COD), high ammonium-N content and the presence of toxic compounds such as heavy metals. Landfill leachate with high COD content was pre-treated by coagulation-flocculation with lime followed by air stripping of ammonia at pH=12. Nutrient removal from pre-treated leachate was carried out using a lab-scale sequencing batch reactor (SBR). Three different operations consisting of different numbers of steps were tested and their performances were compared. These operations were the three-step anaerobic (An)/anoxic (Ax)/oxic (Ox); the four-step (An/Ox/Ax/Ox), and the five-step (An/Ax/Ox/Ax/Ox) operations with total residence time of seven hours each. Experiments were carried out using three consecutive operations with a total cycle time of 21 h at a constant sludge age of 10 days. The lowest effluent nutrient levels were realized by using the five-step operation which resulted in effluent COD, NH4-N and PO4-P contents of 1,400, 107 and 65 mg l(-1), respectively, at the end of 21 h. Addition of domestic wastewater (1/1, v/v) and powdered activated carbon (PAC, 1 g l(-1)) to the pre-treated leachate improved nutrient removals in the five-step SBR operation, resulting in 75% COD, 44% NH4-N and 44% PO4-P removals after 21 hours of operation.
由于化学需氧量（COD）高、铵态氮含量高以及存在重金属等有毒化合物，垃圾渗滤液的生物处理通常导致营养物去除率较低。对高COD含量的垃圾渗滤液先进行石灰混凝絮凝预处理，然后在pH = 12的条件下进行氨汽提。使用实验室规模的序批式反应器（SBR）对预处理后的渗滤液进行营养物去除。测试了由不同步数组成的三种不同运行方式，并比较了它们的性能。这些运行方式分别是三步厌氧（An）/缺氧（Ax）/好氧（Ox）；四步（An/Ox/Ax/Ox），以及五步（An/Ax/Ox/Ax/Ox）运行方式，每种运行方式的总停留时间均为7小时。实验采用三个连续的运行周期，总循环时间为21小时，污泥龄恒定为10天。通过五步运行方式实现了最低的出水营养物水平，在21小时结束时，出水的COD、NH4-N和PO4-P含量分别为1400、107和65 mg l(-1)。向预处理后的渗滤液中添加生活污水（1/1，v/v）和粉末活性炭（PAC，1 g l(-1)）可提高五步SBR运行方式中的营养物去除率，运行21小时后，COD、NH4-N和PO4-P的去除率分别达到75%、44%和44%。
