Ferreiro N, Soto M
Dept. of Química Física e Enxeñeria Química I, University of A Coruña, A Zapateira s/n, 15071 A Coruña, Galiza, Spain.
Water Sci Technol. 2003;47(12):239-46.
Anaerobic hydrolysis of primary sludge from urban wastewater treatment was first studied as part of anaerobic sludge stabilisation and later as a process for readily biodegradable matter (volatile fatty acids) production in order to improve biological nutrient removal. Furthermore, hydrolysis was found to be the rate limiting step in both single- or two-step anaerobic treatment of domestic wastewater. However, the influence on the process of several factors such as sludge concentration and temperature is still barely understood, as are kinetic aspects. The aim of this work was to study the influence of sludge concentration and temperature on the hydrolytic and acidogenic conversion of primary sludge and to determine the hydrolysis kinetic coefficients at different temperatures. Specific VFA production varied from 0.17 to 0.34 gVFA(COD)/gVSS of raw primary sludge, depending mainly on the assay sludge concentration and, to a lesser extent, on the process temperature. The first-order hydrolysis constants were 0.038, 0.095 and 0.169 d(-1) for 10, 20 and 35 degrees C, respectively.
城市污水处理中初次沉淀污泥的厌氧水解最初是作为厌氧污泥稳定化的一部分进行研究的，后来作为一种生产易生物降解物质（挥发性脂肪酸）的工艺来研究，目的是改善生物营养物去除效果。此外，水解被发现是生活污水单步或两步厌氧处理中的限速步骤。然而，污泥浓度和温度等几个因素对该过程的影响以及动力学方面仍然知之甚少。这项工作的目的是研究污泥浓度和温度对初次沉淀污泥水解和产酸转化的影响，并确定不同温度下的水解动力学系数。特定挥发性脂肪酸的产量在每克原始初次沉淀污泥0.17至0.34克挥发性脂肪酸（化学需氧量）之间变化，主要取决于试验污泥浓度，在较小程度上取决于工艺温度。10℃、20℃和35℃时的一级水解常数分别为0.038、0.095和0.169 d(-1)。
