There is an increasing need for landfill leachate pretreatment prior to discharge to wastewater treatment plants due to increasingly stringent sewer discharge limits. Lab-scale tests have shown that the anaerobic biological processes can effectively remove chemical oxygen demand and dissolved organic carbon from landfill leachate. Our work expands the knowledge in anaerobic leachate pretreatment by systematically studying the conversion of carbon and nitrogen species, particularly their recalcitrant fractions in a submerged anaerobic biofilm reactor using real-world leachate from a typical young municipal solid waste landfill. After reaching steady state, the reactor removed 41.7% of the fulvic acids (i.e., 1290 mg C/L). While compounds with a low degree of oxidation (O:C < 0.2) and compounds with a low degree of saturation (H:C < 1) were removed, compounds that were more oxidized (O:C > 0.2) and more saturated (H:C > 1) were produced. At steady state, 98% of recalcitrant dissolved organic nitrogen (i.e., rDON = 222 mg N/L) was removed. Compared to the DON in the raw leachate, the produced DON in the pre-treated leachate were more oxidized (O:C > 0.35) and more bioavailable (N:C > 0.07). The submerged anaerobic biofilm reactor may be an efficient leachate pretreatment method if rDON removal is needed.

由于日益严格的下水道排放限制，越来越需要在将垃圾填埋场渗滤液预处理后再排放到废水处理厂。实验室规模的测试表明，厌氧生物过程可以有效地去除垃圾填埋场渗滤液中的化学需氧量和溶解的有机碳。我们的工作通过使用来自典型年轻市政固体垃圾填埋场的实际渗滤液，系统地研究淹没式厌氧生物膜反应器中的碳和氮物种，特别是其难降解级分的转化，扩展了厌氧渗滤液预处理的知识。达到稳态后，反应器除去了41.7％的黄腐酸（即1290 mg C / L）。去除了氧化度低的化合物（O：C <0.2）和饱和度低的化合物（H：C <1）时，氧化程度更高的化合物（O：C> 0.2）和饱和度更高的化合物（H ：C> 1）。在稳定状态下，去除了98％顽固的溶解性有机氮（即rDON = 222 mg N / L）。与原始渗滤液中的DON相比，经过预处理的渗滤液中产生的DON的氧化程度更高（O：C> 0.35），生物利用度更高（N：C> 0.07）。如果需要去除rDON，则浸没式厌氧生物膜反应器可能是一种有效的渗滤液预处理方法。