酸化液对反硝化速率的影响研究

Study on Effect of Hydrolysate on Denitrification Rate

采用序批式试验研究了酸化液对反硝化的影响。在温度为21～23℃的条件下,进行了4个不同工况的试验,分别为不投加酸化液及酸化液投加量为10、20和30 mg/L(以TOC计)。研究表明,酸化液能显著提高反硝化菌的反硝化速率,酸化液投加量越大,第一阶段的平均反硝化速率和平均耗碳速率也越大。酸化液投加量为30 mg/L时,其第一阶段的平均反硝化速率为0.367mgNO 3--N/(mgVSS.d),是不投加酸化液工况的1.83倍;平均耗碳速率为0.713 mgTOC/(mgVSS.d),是不投加酸化液工况的2倍。酸化液中的有机碳可以分为易被反硝化菌利用和难被反硝化菌利用两部分,酸化液的投加量越大,易被反硝化菌利用的有机碳含量越多,以酸化液投加量为30 mg/L的工况为例,可被反硝化菌利用的有机碳含量为75.7%。

The effect of hydrolysate on the denitrification rate was studied in a sequencing batch reactor. Four series of tests using hydrolysate dosages of 0, 10, 20 and 30 mg/L （calculated as TOC） were conducted at 21 to 23 ℃. The results show that the hydrolysate can significantly improve denitrification rate of denitrifiers. The average denitrification rate and carbon consumption rate are increased with the increase of hydrolysate dosage in the first denitrifieation stage. When the hydrolysate dosage is 30 mg/L, the average denitrification rate in the first stage is 0. 367 mgNO3^- -N/（ mgVSS · d）, being 1.83 times of that without hydrolysate dosage, and the average carbon consumption rate is 0. 713 mgTOC/ （ mgVSS · d）, being twice of that without hydrolysate dosage. Organic carbon in the hydrolysate can be divided into two parts which are easily and hardly used by denitrifiers, and the higher the hydrolysate dosage is, the greater the easily uptaken organic carbon content is. When the hydrolysate dosage is 30 mg/L, the organic carbon which can be used by denitrifiers is 75.7%.