SBR法处理模拟淀粉废水的工艺条件研究

Study on Starch Synthetic Wastewater Treatment by SBR Process

采用序批式活性污泥法(SBR)处理模拟淀粉废水,研究缺氧时间、曝气时间、温度、进水负荷对处理效果的影响.结果表明,SBR法在室温下就能高效地处理淀粉废水.对于淀粉浓度≤1.0g·L-1、CODcr≤1115mg·L-1的废水,单用完全曝气SBR法就能得到很好的去除效果;随着浓度增大,则需要设置缺氧段,以促进淀粉被水解酸化成小分子有机酸,但缺氧段的设置对CODcr的去除不明显,曝气反应对CODcr的去除起主导作用.缺氧段的长短应由废水性质来决定.用SBR法处理淀粉废水具有较好抗负荷冲击能力和系统稳定性,在进水淀粉浓度高达6.0g·L-1、CODcr达6690mg·L-1时,淀粉去除率为97.3%,CODcr去除率为94.0%,经过1个多月的运行,废水中淀粉去除率和CODcr去除率均保持稳定.

The effects of anoxia time, aeration time, temperature and the organic load on the treatment of starch wastewater in SBR reactor were investigated by using synthetic starch wastewater. It is shown that starch wastewater could be efficiently treated at room temperature. Aerobic phase alone was sufficient for starch removal when starch concentration and CODc_r were less than 1.0 g·L^(-1), 1 150 mg·L^(-1), respectively. When increasing the organic load, anoxic phase was required to degrade most of the starch into organic acid. It was also found that CODc_r was hardly removed by the anoxic biodegradation, whereas CODc_r was mostly eliminated in aerobic phase. Moreover, SBR process seemed more insensitive to load fluctuation. Starch and CODc_r removal efficiency achieved 97.3% and 94.5%, respectively, when starch concentration in influent reached 6.0 g·L^(-1) (CODc_r: 6 690 mg·L^(-1)). Both the starch and CODc_r removal efficiency kept stable during over-one-month operation.