酵母菌处理系统中氮缺乏引起的污泥膨胀控制

Bulking Controls Induced by Nitrogen Insufficiency in Yeast System

研究了酵母菌处理色拉油加工废水系统中投加氮源对处理效果的影响及对污泥膨胀的恢复作用 .批量实验结果表明 :①添加氮源有助于提高去除效果 ,碳氮比 (COD/N)为 5 0 /1～ 2 0 /1的条件下 ,油去除率最高 ,达 90 %以上 ;②添加氮源能够改善污泥沉降性 ,COD/N比为 5 0 /1、2 0 /1时污泥沉降性明显优于 1 0 0 /1、2 0 0 /1和不加氮的条件 .连续试验中按COD/N为 2 0 /1添加氮源 ,污泥体积指数 (SVI)稳定在 1 0 0～ 2 0 0 ,油和COD去除率分别达95 %和 90 %以上 .

The effect of nitrogen addition to salad oil manufacturing wastewater system was studied. The results of batch experiments demonstrated: ①addition of nitrogen was helpful to improve oil removal, and the oil removal rate was above 90% when COD/N value was between 50/1 and 20/1; ② addition of nitrogen improved the sludge settleability, which was much better under COD/N value of 50/1 and 20/1. In the continuous experiment, the value of slude volume index(SVI) was between 100 and 200, and the removal rates of oil and COD were above 95% and 90%, respectively when the COD/N ratio was kept at value of 20/1. Nitrogen addition to salad oil manufacturing wastewater system is an effective method for preventing or controlling sludge bulking.