考虑到填埋仍然是对抗固体废物最常用的方法之一,应采用有效的方法处理产生的渗滤液,由于其顽强的性质。在这项工作中,通过引入7.8m3的混凝/絮凝/沉淀(C/F/S)单元和100m2的超滤(UF)膜来有效处理垃圾渗滤液,对由两个并行操作的SBR(每个350m3)和两个串联操作的活性炭(AC)塔(每个3m3)组成的全尺寸系统进行了改造。原始渗滤液的特点是COD和NH4-N浓度高,即,分别为3095±706mg/L和1054±141mg/L,BOD/COD比为0.22,某些重金属的浓度很高。在该改造的多级处理系统中,渗滤液处理的总COD去除率为89.84%,通过生物治疗,C/F,UF,和AC贡献46.31%,4.68%,15.98%,对总有机物含量的去除率为22.87%。改造后的方案实现了总的NH4+-N和TKN去除率分别为92.03%和91.75%,主要归因于有效硝化社区的活动。色数(CN)减少了26.96%,10.29%,15.94%,活性污泥后的5.39%,C/F,UF,和交流吸附过程,对应于总体下降58.91%。关于重金属去除,所有检查的元素,除了Ni,即,废水作为,Cd,Co,Cr,Cu,Hg,Mg,Mn,还有Pb,低于国家当局为限制或不限制灌溉设定的立法限制。最后,总运营费用(OPEX)估计为72,687欧元/年或6.64欧元/立方米。
Considering that landfilling still remains among the most commonly used methods for the confrontation of solid wastes, effective methods should be applied to treat the leachate generated, due to its recalcitrant nature. In this work, a full-scale system consisting of two SBRs operating in parallel (350 m3 each) and two activated carbon (AC) columns operating in series (3 m3 each) was retrofitted by introducing a coagulation/flocculation/sedimentation (C/F/S) unit of 7.8 m3 and an ultrafiltration (UF) membrane of 100 m2 to effectively treat landfill leachate. The raw leachate was characterized by high COD and NH4+-N concentration, i.e., 3095 ± 706 mg/L and 1054 ± 141 mg/L respectively, a BOD/COD ratio of 0.22, and high concentrations of certain heavy metals. Leachate processing in this retrofitted multistage treatment system resulted in total COD removal efficiency of 89.84%, with biological treatment, C/F, UF, and AC contributing 46.31%, 4.68%, 15.98%, and 22.87% to the overall organic content removal. The retrofitted scheme achieved an overall NH4+-N and TKN removal of 92.03% and 91.75% respectively, attributed mostly to the activity of an effective nitrifying community. Color number (CN) was reduced by 26.96%, 10.29%, 15.94%, and 5.39% after the activated sludge, the C/F, the UF, and the AC adsorption process respectively, corresponding to a 58.91% overall decrease. Regarding heavy metal removal, all elements examined, apart from Ni, i.e., effluent As, Cd, Co, Cr, Cu, Hg, Mg, Mn, and Pb, were below the legislative limits set by the national authorities for restricted or unrestricted irrigation. Lastly, total operating expenses (OPEX) were estimated as equal to 72,687 €/year or 6.64 €/m3.