The decentralized bioreactor is a promising process for landfill leachate (LL) treatment, however, it is often confronted with various forms of shock loadings. To explore the robustness of bioreactors to the long-lasting substrate shocks, a long-term study of over 90 days was carried out to investigate the effects of nitrogen (mainly ammonium nitrogen, NH₄-N) and organic (in terms of chemical oxygen demand, COD) shock loading on an engineered zeolite-based biofilter with alternative soil-mixed block (SMB) (EZS-biofilter) for treating matured LL. The low-, mid-, and high-strength intensity of matured LL was theoretical defined mainly according to the content of total nitrogen (TN) and COD. The experiment proved that the EZS-biofilter could effectively absorb the substrate shocks in a range of 104, 408, and 1357 mg/L as TN and 178, 590, and 1050 mg/L as COD, corresponding to the low-, medium-, and high-strength LL, respectively. A modified sensitivity index reflected that the nitrogen shock loadings exerted much more predominant influence than COD shock due to the great variation of nitrification/denitrification. The provided information in this study are beneficial for the practical engineered operation of biofilters for treating matured LL.

分散式生物反应器是处理垃圾渗滤液（LL）的有前途的方法，但是，它经常面临各种形式的冲击负荷。为了探索生物反应器对持久底物冲击的耐用性，进行了90天以上的长期研究，以研究氮素（主要是铵态氮，NH ₄-N）和有机（就化学需氧量而言，COD）的冲击负荷作用在基于工程沸石的生物滤池上，该滤池具有替代的土壤混合块（SMB）（EZS生物滤池），用于处理成熟的LL。理论上主要根据总氮（TN）和化学需氧量（COD）的含量来定义成熟LL的低，中和高强度强度。实验证明，EZS生物滤池可有效吸收底物的TN（分别为TN，104、408和1357 mg / L，COD为178、590和1050 mg / L），对应于低，中，高浓度。 ，和高强度LL。修改后的灵敏度指数反映出，由于硝化/反硝化的巨大变化，氮气冲击负荷比COD冲击具有更大的影响力。