Influence of microwave-assisted pyrolysis parameters and additives on phosphorus speciation and transformation in phosphorus-enriched biochar derived from municipal sewage sludge
Influence of microwave-assisted pyrolysis parameters and additives on phosphorus speciation and transformation in phosphorus-enriched biochar derived from municipal sewage sludge
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微波辅助热解参数和添加剂对城市污泥富磷生物炭中磷形态和转化的影响
DOI：
10.1016/j.jclepro.2020.125550
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发表时间：
2021-03
影响因子：
11.1
通讯作者：
Rundong Li
中科院分区：
文献类型：
--
作者：
Zhenquan Fang;Feifei Liu;Yanlong Li;Bingshuo Li;Tianhua Yang;Rundong Li
城市污泥中富含磷，利用微波辅助热解（MWAP）将其转化为富磷生物炭，可以实现城市污泥的高效处理和磷的循环利用。这符合废物管理和“清洁生产”的可持续发展概念。目前，利用MWAP从城市污水污泥中回收磷的基础知识还很缺乏。在这项研究中，MWAP参数（温度，功率和停留时间）和添加剂对富磷生物炭的性质和磷的迁移和转化的影响进行了研究。的pH值，比表面积，和总磷的增加，随着温度和功率的增加，而更大的停留时间促进非磷灰石无机磷（NAIP）转化为磷灰石无机磷（AP）。CaO促进了NAIP向AP的转化，而MgCl 2促进了AP向NAIP的转化。同时添加CaO和MgCl 2导致了拮抗作用，其中CaO占主导地位，表明磷的原始组分更倾向于与CaO结合联合收割机。在500-600 °C的温度和150分钟的停留时间下，磷回收是最佳的。添加9%CaO或6%CaO +6%MgCl2均能有效地将污泥中的磷转化为AP。在此条件下，富磷生物炭中的AP含量是未添加添加剂生物炭的1.4倍。我们的研究强调了MWAP在关闭磷循环和从复杂材料（如城市污水污泥）中生产肥料方面的潜力。
Municipal sewage sludge is rich in phosphorus, the conversion of which into phosphorus-enriched biochar via microwave-assisted pyrolysis (MWAP) can realize the efficient treatment of municipal sewage sludge and the recycling of phosphorus. This follows the concepts of the sustainable development of waste management and “cleaner production”. At present, fundamental knowledge is lacking on the use of MWAP to recover phosphorus from municipal sewage sludge. In this study, the effect of MWAP parameters (temperature, power, and residence time) and additives on the properties of phosphorus-enriched biochar and the migration and transformation of phosphorus were investigated. The pH, surface area, and total phosphorous increased with increasing temperature and power, whereas a greater residence time promoted the conversion of non-apatite inorganic phosphorus (NAIP) into apatite inorganic phosphorous (AP). CaO addition promoted the conversion of NAIP into AP, whereas MgCl2promoted the conversion of AP into NAIP. The simultaneous addition of CaO and MgCl2led to antagonism, with CaO being dominant, demonstrating that the original phosphorus components prefer to combine with CaO. Phosphorus recovery was optimal at temperatures 500–600 °C and a residence time of 150 min. The addition of 9% CaO or 6% CaO +6% MgCl2was sufficient to convert sewage sludge into phosphorus into AP. Under such conditions, AP contents in phosphorus-enriched biochar increased 1.4 times compared to that of additive-free biochar. Our study highlights the potential of MWAP for closing the phosphorus cycle and for producing fertilizers from complex materials, such as municipal sewage sludge.
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影响因子：
12.8
作者：
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