State Key Laboratory of Environmental Criteria and Risk Assessment, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China.
J Environ Manage. 2023 Jan 15;326(Pt A):116781. doi: 10.1016/j.jenvman.2022.116781. Epub 2022 Nov 14.
Hydrothermal carbonization (HTC) is a promising carbon-neutral technology for converting sewage sludge (SS) and agricultural waste into energy. However, HTC-generated aqueous phase (AP) impedes the development of the former. This study investigated the potential of SS with rice husk (RH) and wheat straw (WS) co-HTC to form hydrochar and AP as substitutes for fuel and chemical fertilizer, respectively. Compared with single SS hydrochar, the yield of co-HTC-based hydrochar and higher heating value significantly increased by 10.9%-21.6% and 4.2%-182.7%, reaching a maximum of 72.6% and 14.7 MJ/kg, respectively. Co-HTC improves the safe handling, storage and transportation, and combustion performance of hydrochar. The total nitrogen concentration in AP-SS was 2575 mg/L, accounting for 67.7% of that found in SS. Co-HTC decreased and increased the amine and phenolic components of AP, respectively. AP-SS-RH and AP-SS-WS significantly increased pakchoi dry weight by 45.5% and 49.4%, respectively, compared with AP-SS. The results of the hydroponic experiments with AP instead of chemical fertilizers revealed that AP-SS did not reduce pakchoi dry weight by replacing <20% chemical fertilizers. However, AP-SS-RH or AP-SS-WS replaced 60% chemical fertilizers. Therefore, the co-HTC of SS and agricultural waste increased the AP substitution of chemical fertilizer from 20% to 60%. These findings suggest that the co-HTC of agricultural waste with SS is a promising technology for converting SS into renewable resource products for fuels and N-rich liquid fertilizer while significantly improving fuel and fertilizer quality.
水热碳化（HTC）是一种很有前途的碳中和技术，可将污水污泥（SS）和农业废物转化为能源。然而，HTC 产生的水相会阻碍前者的发展。本研究调查了 SS 与稻壳（RH）和麦秆（WS）共 HTC 形成水热炭和水相（AP）分别作为燃料和化肥替代品的潜力。与单一 SS 水热炭相比，共 HTC 基水热炭的产率和高位热值分别显著增加了 10.9%-21.6%和 4.2%-182.7%，达到了 72.6%和 14.7 MJ/kg 的最大值。共 HTC 提高了水热炭的安全处理、储存和运输以及燃烧性能。AP-SS 中的总氮浓度为 2575 mg/L，占 SS 中总氮浓度的 67.7%。共 HTC 降低和增加了 AP 中的胺和酚成分。与 AP-SS 相比，AP-SS-RH 和 AP-SS-WS 分别显著提高了小白菜干重 45.5%和 49.4%。用 AP 代替化肥进行水培实验的结果表明，AP-SS 没有通过替代 <20%的化肥来降低小白菜的干重。然而，AP-SS-RH 或 AP-SS-WS 替代了 60%的化肥。因此，SS 和农业废物的共 HTC 将 AP 替代化肥的比例从 20%提高到了 60%。这些发现表明，农业废物与 SS 的共 HTC 是将 SS 转化为可再生资源产品的有前途的技术，可用于燃料和富氮液体肥料，同时显著提高燃料和肥料的质量。
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