移动床生物膜反应器处理废水的特性研究

以氧吸收速率(Rou)为指标,研究了移动床生物膜反应器内两相污泥中自养菌和异养菌的生物活性.分别测定了不同温度和不同负荷下,反应区内悬浮相和附着相污泥的Rou.结果表明:温度为5 ℃时,自养菌的硝化活性为18 ℃时的60%左右;附着相微生物的硝化能力较悬浮相微生物低20%～30%;该反应器具有良好的抗低温和负荷冲击的能力.该反应器内2个反应区中附着相和悬浮相污泥的生物活性为:反应区Ⅱ悬浮相>反应区Ⅰ悬浮相>反应区Ⅱ附着相>反应区Ⅰ附着相.反应区Ⅰ,Ⅱ的反硝化速率分别为0.44和0.63 mg/(g·h),说明后者污泥的反硝化活性好于前者.试验结果还表明,在反应器内NO2--N的积累量非常低. 

Characteristics of Sewage Treatment by Moving-Bed Biofilm Reactor

The bio-activity of activated sludge in the moving-bed biofilm reactor was investigated using oxygen uptake rate (R_ ou ) as an indicator. The R_ ou of both attached-and suspended-growth sludge was determined under different temperature and loading rates. The experimental results indicated that at the temperature of 5 ℃, the nitrification activity was about 60% of that at 18 ℃. The nitrification activity of attached sludge was 20%～30% lower in comparison with suspended sludge. The bio-activity of suspended-and attached-sludge in two reaction zones was in following order: suspended-Ⅱ>suspended-Ⅰ>attached-Ⅱ>attached-Ⅰ. The denitrification rate of sludge in zone Ⅰ and zone Ⅱ was 0.44 and 0.63 mg/(g·h), respectively, which revealed that the denitrification activity of sludge-Ⅱ was higher compared with sludge-Ⅰ, the results also indicated that the accumulation of nitrite was very low.