Ca-Si-Al元素比例对水热过程中生活垃圾焚烧飞灰中铝硅酸盐矿物形成和多环芳烃解毒的影响,Energy & Fuels

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Ca-Si-Al元素比例对水热过程中生活垃圾焚烧飞灰中铝硅酸盐矿物形成和多环芳烃解毒的影响
Energy & Fuels ( IF 5.2 ) Pub Date : 2021-05-17 , DOI: 10.1021/acs.energyfuels.1c00072
Dezhi Shi ₁ , Haihang Tong ₁ , Mengying Lv ₁ , Hanbo Zhang ₁ , Hailin Wang ₁ , Ling Luo ₂ , Jingyuan Ma ₁ , Cailing Ma ₁ , Dan Luo ₁ , Xuhuan Zhao ₁ , Zhiyong Han ₃

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城市固体废物焚烧过程中产生的飞灰 (FA) 含有危险的多环芳烃 (PAH)。水热处理 (HT) 是一种很有前途的有机化合物降解技术，被用于该研究中 FA 中多环芳烃的水热解毒。由于不同水平的 Ca/(Si + Al) 和 Al/(Si + Al) 摩尔比通过调整 SiO ₂和 Al ₂ O ₃添加到 FA 中，形成了不同种类的铝硅酸盐矿物，并且在 HT 产品中观察到不同的 PAHs 解毒效率。对于在较低 (0.17) 和中等 (0.51) Al/(Si + Al) 比率水平下形成的铝硅酸盐矿物，获得了雪硅钙石，并且随着 Ca/(Si + Al) 比率水平的降低而增强。在 0.71 的较高 Al/(Al + Si) 比值水平下，即使 FA-30-3 的 Ca/(Si + Al) 比值 (1.01) 低且在雪硅钙石形成的合适范围内，也不能完全合成雪硅钙石（ 0.67–1.20）。与Ca/(Si+Al)比相比，Al/(Si+Al)比不仅影响雪硅钙石的合成，而且对多环芳烃浓度去除率和多环芳烃去除率的影响更为显着。多环芳烃的毒性等效质量 (TEQ)。由于无法在 0.71 的较高 Al/(Al + Si) 比率水平下合成雪硅钙石，因此观察到 PAH 的解毒效率最弱。当在 FA-30-1 中有效合成雪硅钙石时，其 Ca/(Al + Si) 和 Al/(Al + Si) 比值都在适合雪硅钙石形成的范围内 [Ca/(Al + Si) 比值 = 0.67–1.20 和 Al/(Al + Si) 比 = 0–0.22]，实现了 PAH 的最佳解毒效率。在 HT 过程中受 Ca-Si-Al 元素比例影响的雪硅钙石的形成对 FA 中多环芳烃的解毒有积极的影响。为考察形成的矿物质含量与多环芳烃解毒效率之间的关系而进行的回归分析结果表明，雪钙石的形成有助于促进多环芳烃的解毒，但水铝石的存在降低了解毒效果。与Ca/(Si+Al)比相比，Al/(Si+Al)比对雪钙石和水铝钙石的形成影响更为显着。

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Effect of Ca–Si–Al Element Proportion on the Formation of Aluminosilicate Minerals and Detoxification of PAHs in Fly Ash from MSW Incineration during the Hydrothermal Process

Fly ash (FA) produced during municipal solid waste incineration contains hazardous polycyclic aromatic hydrocarbons (PAHs). Hydrothermal treatment (HT), a promising technology for the degradation of organic compounds, was applied in this study for hydrothermal detoxification of PAHs in FA. Due to different levels of Ca/(Si + Al) and Al/(Si + Al) molar ratios achieved by adjusting the SiO₂ and Al₂O₃ added to FA, different kinds of aluminosilicate minerals were formed and different detoxification efficiencies of PAHs were observed in HT products. For aluminosilicate minerals formed at lower (0.17) and moderate (0.51) Al/(Si + Al) ratio levels, tobermorite was obtained and it enhanced with the decrease of Ca/(Si + Al) ratio levels. At higher Al/(Al + Si) ratio levels of 0.71, tobermorite cannot be synthesized completely even when the Ca/(Si + Al) ratio for FA-30-3 (1.01) was low and in the suitable range for tobermorite formation (0.67–1.20). Compared with the Ca/(Si + Al) ratio, the Al/(Si + Al) ratio not only affected the synthesis of tobermorite but also had much more significant influence on both the removal percentage of the concentration of PAHs and the removal percentage of the toxicity equivalent quality (TEQ) of PAHs. Attributing to the fact that tobermorite cannot be synthesized at higher Al/(Al + Si) ratio levels of 0.71, the weakest detoxification efficiency of PAHs was observed. When tobermorite was effectively synthesized in FA-30-1, for which both the Ca/(Al + Si) and Al/(Al + Si) ratios were in the suitable range for tobermorite formation [Ca/(Al + Si) ratio = 0.67–1.20 and Al/(Al + Si) ratio = 0–0.22], the best detoxification efficiency of PAHs was achieved. The formation of tobermorite affected by the Ca–Si–Al element proportion during the HT process has a positive effect on the detoxification of PAHs in FA. The results of regression analysis performed for investigating the relationship between the content of minerals formed and the detoxification efficiency of PAHs showed that the formation of tobermorite is helpful to promote the detoxification of PAHs but the existence of hydrocalumite reduced the detoxification. Compared with the Ca/(Si + Al) ratio, the Al/(Si + Al) ratio has more significant influence on the formation of tobermorite and hydrocalumite.

更新日期：2021-06-03

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