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针对腈纶废水生化出水用传统脱氮工艺深度脱氮时碳源不足的问题,采用三级生物膜反应器作为深度处理装置,研究了反应器的启动及进水pH、水力停留时间(HRT)、进水氨氮(NH4+-N)浓度对NH4+-N去除率的影响并确定其最佳运行条件及最佳条件下总氮(TN)的去除效果.结果表明,在HRT为24 h,进水pH为7.8～8.0条件下反应器对NH4+-N和TN的去除效果最佳,平均去除率分别为94.6%和53%;且进水NH4+-N浓度对其去除效果没有明显影响;反应器在不投加有机碳源情况下,对TN有明显去除效果,平均去除率53%,最高去除率达66%,表明三级生物膜反应器深度处理腈纶废水时脱氮效果明显.
Aiming at the problem of insufficient carbon source in the process of biochemical effluent of acrylic fiber wastewater by the traditional denitrification process, the three-stage biofilm reactor was used as the deep treatment device. The effects of reactor start-up and pH, hydraulic retention time (HRT) The effect of NH4 + -N concentration on the NH4 + -N removal efficiency was studied and the optimum operating conditions and total nitrogen (TN) removal efficiency were determined. The results showed that under the conditions of HRT of 24 h, The removal efficiencies of NH4 + -N and TN were the best under the condition of 7.8-8.0, the average removal efficiencies were 94.6% and 53%, respectively. The NH4 + -N concentration had no significant effect on the removal efficiency of the reactor. Under the condition of adding organic carbon source, the removal efficiency of TN was obvious, with an average removal rate of 53% and a maximum removal rate of 66%, indicating that the nitrogen removal efficiency of the tertiary biofilm reactor for deep treatment of acrylic wastewater was significant.