再生水条件下灌水器内生物膜生长对流量的影响

Effects of Growth of Biofilm to Emitters Flow in Emitter of Reclaimed Wastewater Irrigation

选用生物泳动床、生物滤池两种污水处理工艺下的再生水进行滴灌试验,研究灌水器内生物膜的生长情况。结果表明:灌水器内的生物膜经历附着期、生长期和成熟期,在成熟期达到动态平衡状态;灌水器进水口处的生物膜附着快、生长速度快,生物膜最厚。脱落的生物膜沉积于流道内或出水口,体现流量的变化。灌水器的平均流量变化落后于生物膜的生长变化;当生物膜到达成熟期时,生物膜反复脱落生长,是灌水器堵塞的高风险期,表现为灌水器的平均流量持续下降。系统运行184 h后,可采用加酸、加氯等措施冲洗滴灌灌水器。

Wastewater irrigation test under biological swimming bed and biological filter was done to study biofilm growth situation in emitters. Results showed that biofilm growth experienced three periods of attachment period, growth period and maturity period, and biofilm was at a dynamic equilibrium state in maturity period. Biofilm was attached fast, growth fast and was the thickest on the inlet of emitters. Detached biofilm deposited on the inside flow or the outlet, which was embodied on the flow changes. The average flow changes of emitter lagged growth change of biofilom. When biofilm reached maturity period, it was detached repeatedly to grow, and this was high-risk period of emitter clogging when the average flow of emitter was declining. After 184 h, acid and chlorine can be added to flush emitter.