Kato M T, Rebac S, Lettinga G
Federal University of Pernambuco, Department of Civil Engineering, Recife, Brazil.
Appl Biochem Biotechnol. 1999 Jan;76(1):15-32. doi: 10.1385/abab:76:1:15.
Anaerobic treatment of low-strength brewery wastewater, with influent total chemical oxygen demand (COD) (CODin) concentrations ranging from 550 to 825 mg/L, was investigated in a pilot-scale 225.5-L expanded granular sludge bed (EGSB) reactor. In an experiment in which the temperature was lowered stepwise from 30 to 12 degrees C, the COD removal efficiency decreased from 73 to 35%, at organic loading rates (OLR) of 11-16.5 g COD/L/d. The applied hydraulic retention time (HRT) and liquid upflow velocity (Vup) were 1.2 h and 5.8 m/h, respectively. Under these conditions, the acidified fraction of the CODin varied from 45 to 90%. In addition to the expected drop in reactor performance, problems with sludge retention were also observed. In a subsequent experiment set at 20 degrees C, COD removal efficiencies exceeding 80% were obtained at an OLR up to 12.6 g COD/L/d, with CODin between 630 and 715 mg/L. The values of HRT and Vup applied were 2.1-1.2 h, and 4.4-7.2 m/h, respectively. The acidified fraction of the CODin was above 90%, but sludge washout was not significant. These results indicate that the EGSB potentials can be further explored for the anaerobic treatment of low-strength brewery wastewater, even at lower temperatures.
在一个中试规模的225.5升膨胀颗粒污泥床（EGSB）反应器中，研究了进水总化学需氧量（COD）（CODin）浓度在550至825毫克/升之间的低强度啤酒厂废水的厌氧处理。在一个温度从30摄氏度逐步降至12摄氏度的实验中，在11-16.5克COD/升/天的有机负荷率（OLR）下，COD去除效率从73%降至35%。所应用的水力停留时间（HRT）和液体上流速度（Vup）分别为1.2小时和5.8米/小时。在这些条件下，CODin的酸化部分在45%至90%之间变化。除了反应器性能预期下降外，还观察到污泥保留方面的问题。在随后设定为20摄氏度的实验中，在OLR高达12.6克COD/升/天、CODin在630至715毫克/升之间时，COD去除效率超过80%。所应用的HRT和Vup值分别为2.1-1.2小时和4.4-7.2米/小时。CODin的酸化部分高于90%，但污泥流失并不显著。这些结果表明，即使在较低温度下，EGSB在低强度啤酒厂废水厌氧处理方面的潜力仍可进一步探索。
