Department of Civil and Environmental Engineering, University of Utah, Salt Lake City, UT 84112, USA.
Department of Civil, Environmental and Construction Engineering, University of Central Florida, Orlando, FL 32816, USA.
Waste Manag. 2020 Feb 1;102:420-431. doi: 10.1016/j.wasman.2019.10.048. Epub 2019 Nov 14.
This manuscript presents an integrated management scheme for leachate which employed struvite precipitation to recover ammonia nitrogen and phosphorus, aerobic granular sludge process for carbon oxidation (in the form of BOD and sCOD) and single stage anaerobic ammonia oxidation (ANAMMOX) for nitrogen management. The influent fed to the integrated treatment scheme was a mixture of anaerobic digester centrate and real leachate in 4:1 ratio. Almost 77% recovery of phosphorus and 25% removal of NH-N were accomplished through struvite precipitation at an optimum pH of 9. High pH contributed to free ammonia loss during struvite precipitation experiments. In the aerobic granular sludge reactor overall, BOD, COD and NH-N removal percentages were 74%, 45% and 35% and in the PN/A reactor, overall 35% removal of total inorganic nitrogen (TIN) was observed. More than 80% BOD removal was recorded in the granular reactor with soluble COD (sCOD) removal fluctuating between 28 and 57% depending on the operational phase. High-throughput amplicon sequencing of 16S rRNA gene targeting V4 region revealed a dominance of phylum Planctomycetes, in the PN/A reactor system. Presence of Rhodobacteraceae, Xanthomonadaceae, Flavobacteriaceae in the granular biomass confirmed the defined redox zones inside mature granules indicating simultaneous removal of nitrogen (N) and organics in aerobic granular sludge technology. Exposing the synthetically cultured aerobic granules directly to the mixture of leachate and centrate unveiled an alteration in physical characteristics of granules; however, reactor operational data and microbial community analysis ascertain the effectiveness of the treatment scheme treating two urban waste-streams.
本文提出了一种综合的渗滤液处理方案，采用鸟粪石沉淀回收氨氮和磷，好氧颗粒污泥工艺进行碳氧化（以 BOD 和 sCOD 的形式）和单级厌氧氨氧化（ANAMMOX）进行氮管理。该综合处理方案的进水为厌氧消化液浓缩液和实际渗滤液以 4:1 的比例混合。通过在最佳 pH 值 9 下进行鸟粪石沉淀，实现了近 77%的磷回收和 25%的 NH-N 去除。在鸟粪石沉淀实验中，高 pH 值导致游离氨损失。在好氧颗粒污泥反应器中，BOD、COD 和 NH-N 的去除率分别为 74%、45%和 35%，而在 PN/A 反应器中，总无机氮（TIN）的去除率总体为 35%。在颗粒反应器中，BOD 去除率超过 80%，可溶性 COD（sCOD）去除率在 28%至 57%之间波动，具体取决于操作阶段。针对 V4 区的 16S rRNA 基因的高通量扩增子测序结果显示，在 PN/A 反应器系统中，优势菌门为浮霉菌门。颗粒生物量中 Rhodobacteraceae、Xanthomonadaceae 和 Flavobacteriaceae 的存在证实了成熟颗粒内存在明确的氧化还原区，表明好氧颗粒污泥技术可同时去除氮（N）和有机物。将合成培养的好氧颗粒直接暴露于渗滤液和浓缩液混合物中，会改变颗粒的物理特性；然而，反应器运行数据和微生物群落分析证实了该处理方案处理两种城市废水的有效性。
