School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China; Jiangsu Collaborative Innovation Center of Water Treatment Technology and Material, Suzhou 215011, China.
School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China.
Bioresour Technol. 2019 Jun;282:125-132. doi: 10.1016/j.biortech.2019.03.004. Epub 2019 Mar 1.
This study investigated the reactions among CO, PO, NH, Mg, and Ca, under different CO concentration and Mg/Ca ratio, and conducted sludge anaerobic digestion (AD) with silicate addition to achieve in-situ CO sequestration and nutrients removal. High CO concentration facilitated the formation of MgNHPO, and Mg/Ca ratio of 1:1 achieved best CO, PO, and NH removal in simulated anaerobic digestate. Supplementation of 40 g/L magnesium silicate combined with 20 g/L wollastonite decreased CO content in biogas from 28.2% to 19.0%, and removed PO and NH by 61.8% and 21.2%, respectively, in AD. Simultaneous in-situ CO sequestration and nutrients removal was achieved by directed precipitation of PO, NH, and CO with silicate released Mg and Ca, to form MgNHPO and CaCO. Meanwhile, methane production was improved by 51.2% with silicate supplementation. This study provides an attractive measure for CO and nutrients removal as well as methane production enhancement of sludge AD.
本研究探讨了 CO、PO、NH、Mg 和 Ca 在不同 CO 浓度和 Mg/Ca 比下的反应，通过添加硅酸盐进行污泥厌氧消化（AD），以实现原位 CO 固存和养分去除。高 CO 浓度有利于 MgNHPO 的形成，而 Mg/Ca 比为 1:1 时，在模拟厌氧消化物中实现了最佳的 CO、PO 和 NH 去除。添加 40g/L 硅酸镁和 20g/L 硅灰石，将沼气中的 CO 含量从 28.2%降低至 19.0%，分别去除 61.8%和 21.2%的 PO 和 NH。通过硅酸盐释放的 Mg 和 Ca 定向沉淀 PO、NH 和 CO，形成 MgNHPO 和 CaCO，实现了原位 CO 固存和养分去除。同时，添加硅酸盐后甲烷产量提高了 51.2%。本研究为污泥 AD 的 CO 和养分去除以及甲烷产量提高提供了一种有吸引力的措施。
