进水浓度对UASB颗粒污泥形成的影响研究

采用人工葡萄糖配水,在相同的操作条件下,研究了进水浓度对UASB反应器颗粒污泥形成的影响。试验结果表明,9000mg/L COD的高浓度进水能够培养出良好的颗粒污泥,颗粒直径1.0—2.5mm(大多为2.0mm),SVI 16.03 ml/g,沉降性能良好.颗粒化过程在二个多月的试验周期内基本完成。反应器容积负荷达30.8kg COD/m~3·d,COD去除率大于85％.而采用1000mg/L COD的低浓度进水,也能培养出颗粒污泥但过程较慢,颗粒直径较小,约0.5—1.5mm,反应器容积负荷最高为10.2kg COD/m~3·d,COD去除率约75％。本文还就处理实际废水时的操作控制技术进行了分析讨论。

Effect of Influent Strength on Granulation of Sludge in UASB Reactor

Using synthetic glucose wastewater, the effect of influent strength on granulation of sludge in UASB reactor was investigated. Results show that granulation could be well achieved in an operatinal period of 2 months or more, when UASB reactor was directly fed with high strength influent of 9000 mg/L COD. The granular sludge were 1.0-2.5mm (mostly 2.0mm) in diameter, SVI 16.03ml/g. The organic loadings of UASB reactor reached 30.8kg COD/m3. d and COD removal efficiency over 85%. The granular sludge could also be cultivated but the granulation of sludge was found to be comparatively slow and incomplete, when the low strength influent of 1000mg/L COD was fed to the reactor. The size of sludge granule was smaller, in the range of 0.5-1.5mm, and the maximum organic loadings was 10.2 kg COD/m3. d, COD removal efficiency approximately 75%. The relationship be-tween influent strength and granulation of sludge and the practical operation technology forthe tre atment of industrial wastewater with UASB reactor were discussed.