Water washing can effectively remove Na, K, and Cl in biomass, which can cause fouling, slagging, and corrosion during thermal conversion process of biomass fuels. However, it is necessary to dispose the leachates appropriately after water washing. Characterization of organic matters in leachates should be performed first, which is beneficial to find an effective way to dispose the leachate. In this study, four biomass materials are washed with the deionized water at 30°C, 60°C, and 90°C. The release of toluene and styrene is studied. The results show that yields of organic matters for corn stalk and wheat straw are the highest relatively, of which the eventual values are 8% and 15%, respectively. Less toluene and styrene are released at 30–60°C than that at 90°C for wheat straw. But the release of toluene and styrene in rice hull leachate shows the opposite trend. The concentration of styrene in leachates reaches a minimum value at 60°C. The corresponding values are 0.017 mg L⁻¹ for wheat straw and 0.15 mg L⁻¹ for rice hull. But none is detected in corn stalk and sorghum stalk leachates. In addition, variations of toluene and styrene concentrations are obviously different with different washing temperatures.

中文翻译：

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生物质水洗过程中苯释放的研究

水洗可有效去除生物质中的Na，K和Cl，在生物质燃料的热转化过程中会引起结垢，结渣和腐蚀。但是，有必要在水洗后适当地处理渗滤液。首先应对渗滤液中的有机物进行表征，这有助于找到一种有效的方法来处理渗滤液。在这项研究中，四种生物质材料分别在30°C，60°C和90°C下用去离子水洗涤。研究了甲苯和苯乙烯的释放。结果表明，玉米秸秆和小麦秸秆的有机物产量最高，最终分别为8％和15％。在30–60°C下释放的甲苯和苯乙烯比在90°C下释放的小麦秸秆少。但是甲苯和苯乙烯在稻壳浸出液中的释放显示出相反的趋势。浸出液中苯乙烯的浓度在60°C达到最小值。相应的值为0.017 mg L^-1用于小麦秸秆和0.15毫克的L ^-1为稻壳。但在玉米秸秆和高粱秸秆浸出液中均未检出。此外，不同洗涤温度下甲苯和苯乙烯浓度的变化也明显不同。