生物慢滤系统对再生水中氮磷降解的试验研究

Experiment on degradation of nitrogen and phosphorous in reclaimed water by biological slow filter

利用生物慢滤系统中菌-藻共生的特点,对用于景观补水的再生水中氮磷进行有效的去除,可有效预防由于再生水中氮磷营养盐浓度较高而引发的景观水体富营养化问题。通过生物慢滤系统净化再生水的试验研究表明,生物慢滤系统在保持上覆水深为80cm、滤层厚度为80cm、滤速为0.1m/h的条件下,对水体中总氮、氨氮、硝酸盐氮、总磷和高锰酸盐指数平均去除率分别为57.55%、50.16%、46.37%、66.32%和47.04%,叶绿素a的去除率可达95.75%;经生物慢滤系统处理后的再生水在景观储存过程中藻类的生长缓慢,叶绿素a含量始终维持在较低水平,氮磷含量较低且趋于稳定。经生物慢滤池处理的再生水用于景观水体的补充水源,可减少富营养化的发生频率。

Using bacteria-algal symbiosis characteristics of biological slow filtration system and the effective removal of nitrogen and phosphorus in reuse water for landscape replenishment can effectively prevent the problems of eutrophication of landscape water body result from the high nutrient concentration of nitrogen and phosphorus in water. The experimental of reclaimed water purification by biological slow filter system showed that when biological slow filter system keep the conditions of overlying water depth of 80 cm,filter layer thickness of 80 cm,filtration rate of 0. 1m / h,the average removal rate of total nitrogen,ammonia nitrogen,nitrate nitrogen and potassium permanganate index in water is 57. 55%,50. 16%,46. 37%,66. 32% and 47. 04% respectively,the removal rate of chlorophyll a is up to 95. 75%. After the reuse water is treated by biological slow filter system,the growth of algae is slow and the content of chlorophyll a maintains at a low level during the process of landscape storage,and the content of nitrogen and phosphorus is low and stabilizing. The reclaimed water which is treated by biological slow filter system can be used as the replenishment source of landscape water so as to reduce the frequency of eutrophication.