Tianjin Key Laboratory of Biomass Waste Utilization, School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China.
Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310023, China.
Int J Environ Res Public Health. 2022 Feb 28;19(5):2818. doi: 10.3390/ijerph19052818.
Large amounts of sewage sludge (SS) and wetland plant wastes are generated in the wastewater treatment system worldwide. The conversion of these solid wastes into biochar through co-pyrolysis could be a promising resource utilization scheme. In this study, biochar was prepared by co-pyrolysis of SS and reed (, RD) using a modified muffle furnace device under different temperatures (300, 500, and 700 °C) and with different mixing ratios (25, 50, and 75 wt.% RD). The physicochemical properties of biochar and the transformation behaviors of phosphorus (P) and heavy metals during the co-pyrolysis process were studied. Compared with single SS pyrolysis, the biochar derived from SS-RD co-pyrolysis had lower yield and ash content, higher pH, C content, and aromatic structure. The addition of RD could reduce the total P content of biochar and promote the transformation from non-apatite inorganic phosphorus (NAIP) to apatite phosphorus (AP). In addition, co-pyrolysis also reduced the content and toxicity of heavy metals in biochar. Therefore, co-pyrolysis could be a promising strategy to achieve the simultaneous treatment of SS and RD, as well as the production of value-added biochar.
在全球范围内的废水处理系统中，会产生大量的污水污泥（SS）和湿地植物废物。通过共热解将这些固体废物转化为生物炭可能是一种有前途的资源利用方案。本研究采用改良马弗炉装置，在不同温度（300、500 和 700°C）和不同混合比（25、50 和 75wt.%RD）下，通过 SS 和芦苇（RD）的共热解制备生物炭。研究了生物炭的物理化学性质以及磷（P）和重金属在共热解过程中的转化行为。与 SS 单一组分热解相比，SS-RD 共热解生物炭的产率和灰分含量较低，pH 值、C 含量和芳香结构较高。RD 的添加可以降低生物炭中总磷的含量，并促进非磷灰石无机磷（NAIP）向磷灰石磷（AP）的转化。此外，共热解还降低了生物炭中重金属的含量和毒性。因此，共热解可能是一种很有前途的策略，可以同时处理 SS 和 RD，并生产有价值的生物炭。
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