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Enhancement of anaerobic digestion of waste activated sludge by chemical pretreatment

机译：化学预处理增强厌氧消化活性污泥的能力

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In this study, the effects of alkaline (pH 10) and acidic (pH 2-5) chemical pretreatment on dissolution of organic matters and biochemical methane potential (BMP) at waste activated sludge (WAS). For each pretreatment methods at different temperature (25, 40, 50 and 60 degrees C) and operating time (5, 15, 30, 45 min) are the two factors. In the first step, the feasibility of chemical pretreatment in anaerobic digestion was investigated. Increases in soluble chemical oxygen demand (sCOD)/total chemical oxygen demand (tCOD) were determined in all chemical pretreatments. In the second step, the sCOD/tCOD ratio was used to determine the effects on the pretreatment and BMP assay was used to examine the enhanced anaerobic digestion. The pretreatment study conditions were determined due to the highest sCOD/tCOD ratios. These highest ratios were obtained at different pH values, operational times and temperatures. The highest cumulative BMP values were taken at pH 10, 10 min, 60 degrees C and pH 5, 15 min, 40 degrees C. Under these pretreatment conditions, the cumulative BMP values were 47.7 mL CH4/g VSS and 12.3 mL CH4/g VSS at conditions pH 10, 10 min, 60 degrees C and pH 5, 15 min, 40 degrees C (the control BMP value was extracted). The methane yield values were 43.61% and 12.34% at alkaline acidic conditions (pH 10 and 5). In the pH 2 study results indicated that the cumulative BMP values were 105.1 and 90.5 mL CH4/g VSS for 50-60 degrees C. These values were exactly the same or lower than the control BMP value.
机译：在这项研究中，碱性（pH 10）和酸性（pH 2-5）化学预处理对废料活性污泥（WAS）溶解有机物和生化甲烷潜力（BMP）的影响。对于在不同温度（25、40、50和60摄氏度）和操作时间（5、15、30、45分钟）的每种预处理方法，这是两个因素。第一步，研究了化学预处理在厌氧消化中的可行性。在所有化学预处理中均确定了可溶性化学需氧量（sCOD）/总化学需氧量（tCOD）的增加。第二步，使用sCOD / tCOD比值确定对预处理的影响，并使用BMP分析法检查增强的厌氧消化率。由于最高的sCOD / tCOD比值确定了预处理研究条件。这些最高比率是在不同的pH值，操作时间和温度下获得的。在pH 10、10分钟，60摄氏度和pH 5、15分钟，40摄氏度下获得最高的BMP累积值。在这些预处理条件下，BMP的累积值分别为47.7 mL CH4 / g VSS和12.3 mL CH4 / g VSS在pH 10、10分钟，60摄氏度和pH 5、15分钟，40摄氏度的条件下（提取对照BMP值）。在碱性酸性条件（pH为10和5）下，甲烷的产率值为43.61％和12.34％。在pH 2中，研究结果表明，在50-60摄氏度下，BMP的累积值为105.1和90.5 mL CH4 / g VSS。这些值与对照BMP值完全相同或更低。

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