污水管道生物膜的温度效应研究

为了考察污水管道生物膜的温度效应,研究不同温度条件下的生物膜量、生物膜活性、生物膜厚度、出水水质及出水水质变化率与生物膜量的关系。结果表明,11～13℃时单位生物膜量对COD、TN、TP的降解率分别为0.344、1.06×10-2、0.5×10-2 mg.mg-1.d-1,达到最大值,但生物膜生长缓慢;17～19℃与23～25℃时生物膜综合性能较好,生物膜量、生物膜活性都处于最佳状态,23～25℃时,生物膜干重和生物膜COD可达117、79 mg.L-1,17～19℃时,蛋白质为0.510 mg.mg-1,耗氧率为0.510 mg.mg-1.min-1,多聚糖为0.009 24 mg.mg-1.min-1、0.305 mg.mg-1,并且污水中TP、TN的降解率分别可达62.3%和49.4%;但通过对出水水质的观察,23～25℃时由于生物膜过度生长,导致大量脱落,出水水质混浊。

THE STUDY OF TEMPERATURE EFFECT ON PIPE BIOFILM

In order to investigate the temperature effect of pipe biofilm,we studied biofilm concentration,biofilm activity,biofilm thickness,water quality and the relation between the change rate of water quality and biofilm concentration,respectively.The results showed that when the temperature was 11～13 ℃,the degradation rates of COD,TN and TP were 0.344,1.06×10-2 and 0.5×10-2 mg·mg-1·d-1,which reached the highest,but the biofilm grew slowly.When the temperature was 17～19 ℃ and 23～25 ℃,the comprehensive performance of the biofilm was good,both the biofilm concentration and biofilm activity were at their best,dry weight of biofilm and biofilm COD reached 117 mg·L-1 and 79 mg·L-1 in 23～25 ℃,and in 17～19 ℃,the amount of protein,oxygen consumption and polysaccharide were 0.510 mg·mg-1,0.00924 mg·mg-1·min-1 and 0.305 mg·mg-1,respectively.Moreover,the degradation rate of TP and TN can reach 62.3% and 49.4%.But because of the excessive growth of biofilm in 23～25 ℃,the biofilm shed a lot and the water quality was turbid.