中试ANAMMOX-ASBR处理火电厂脱硫脱硝尾液的抑制及恢复特性

Suppression and Recovery Characteristics of Pilot-scale ANAMMOX-ASBR System Treating Desulfurization and Denitrification Tailings from Thermal Power Plant

采用中试ASBR (530 L),接种氧化沟工艺的兼氧段污泥,考察了厌氧氨氧化(anaerobic ammonium oxidation,ANAMMOX)的启动及其与反硝化耦合处理实际火电厂脱硫脱硝尾液的抑制和恢复特性.结果表明,温度35℃±1℃、反应时间为20 h,可180 d实现ANAMMOX的成功启动;活性稳定阶段,总氮(TN)去除率和去除负荷分别达91. 1%和0. 3kg·(m^3·d)^(-1).处理脱硫脱硝尾液的中试ANAMMOX-ASBR在活性抑制阶段,可采用去除抑制因素并降低进水基质浓度方式,实现其活性的恢复(93 d).此外,采用逐步增加脱硫脱硝尾液投加比例(30%、70%、100%)的方式,可实现中试ASBR内ANAMMOX与反硝化耦合,使得系统出水TN去除率和COD浓度分别稳定在约92%和88. 5 mg·L^(-1).修正的Logistic模型更加适合描述ANAMMOX受脱硫脱硝尾液冲击后的NRR恢复过程,得到的NRR恢复延迟时间λ为17. 777个周期,R^2为0. 929 48.

A pilot-scale anaerobic sequencing batch reactor（ ASBR,working volume 530 L）,inoculated with oxygen-segmented sludge in an oxidation ditch process,was developed to investigate the start-up of anaerobic ammonium oxidation（ ANAMMOX） and its combination with denitrification for deep-level nitrogen removal from desulfurization and denitrification tailings of a thermal power plant.The results showed that,under conditions with a temperature of（ 35 ± 1） ℃ and reaction time of 20 h,ANAMMOX was successfully started up after 180 days. During the stable operations phase,total nitrogen（ TN） removal rate and removal efficiency reached 91. 1%and 0. 3 kg·（ m^3·d）^-1,respectively. During the activity suppression stage of the ANAMMOX-ASBR treating real desulfurization and denitrification tailings,the recovery of its activity could be achieved in 93 days by removing inhibitory factors（ Cl^-concentration） and reducing the concentration of influent substrate. In addition, by gradually increasing the addition ratio of desulfurization and denitrification tails（ 30%,70%,and 100%）,the coupling of ANAMMOX and denitrification was achieved in the ASBR to ensure stable effluent TN removal rate and COD concentrations below 92% and 88. 5 mg·L^-1,respectively. The modified logistic model was more suitable for the NRR recovery process after ANAMMOX was impacted by desulfurization and denitrification tailings. The NRR recovery delay time λ was 17. 777 cycles,the and R^2 was 0. 929 48.