K+强化高盐环境下厌氧氨氧化脱氮效能

针对含盐废水生物脱氮效能较低的问题,采用厌氧序批式反应器研究了K~+浓度变化对厌氧氨氧化污泥脱氮效能的影响.结果表明,适量的K~+可有效的提升反应器脱氮效能,K~+对厌氧氨氧化污泥脱氮效能的影响主要分为4个阶段:适应阶段,K~+浓度为(0~2 mmol·L~(-1)),K~+的突然添加破坏了原有反应平衡,但最终厌氧氨氧化菌适应了K~+的存在,由于K~+还未对厌氧氨氧化菌产生明显效果,NH_4~+-N和NO_2~--N去除率略有上升;活性提升阶段(2~8 mmol·L~(-1)),K~+对厌氧氨氧化生物系统有促进作用,随着K~+浓度的提升,NH_4~+-N和NO_2~--N去除率显著提升;活性稳定阶段(8~20 mmol·L~(-1)),厌氧氨氧化菌脱氮效能处于稳定状态,NH_4~+-N和NO_2~--N去除率虽有下降,但还是高于未添加K~+时;抑制阶段(大于20 mmol·L~(-1)),此时厌氧氨氧化菌活性降低,K~+对厌氧氨氧化产生较大抑制,脱氮效能已低于0 mmol·L~(-1).在整个周期内K~+浓度8 mmol·L~(-1)时达到最佳去除效果,NH_4~+-N与NO_2~--N的平均去除率为89.24%和84.87%,NRR为1.113 kg·(m~3·d)~(-1).

Nitrogen Removal Performance of ANAMMOX Process with K+ Addition in Saline Surroundings

In view of the poor performance of biological nitrogen removal in saline wastewater treatment, nitrogen removal of anaerobic ammonium oxidation(ANAMMOX) with K⁺ addition was studied. The results showed that K⁺ addition could strengthen nitrogen removal performance. The effect of K⁺ on ANAMMOX process was mainly divided into four stages. In the adaptive phase(0-2 mmol·L^-1), sudden addition of K⁺ destroyed the original equilibrium reaction, but ultimately ANAMMOX bacteria could adapt to the presence of K⁺. Because K⁺ had no obvious effects on anaerobic ammonia oxidation bacteria, the removal rates of NH₄⁺-N and NO₂^--N slightly increased. In the ascension phase(2-8 mmol·L^-1), K⁺ played a role in promoting anaerobic ammonia oxidation biological systems, with increasing concentration of K⁺, the removal rates of NH₄⁺-N and NO₂^--N significantly increased. In the stabilization phase(8-20 mmol·L^-1), the nitrogen removal rate decreased, but was still higher than the control without K⁺ addition. In the inhibition phase(more than 20 mmol·L^-1), K⁺ largely inhibited anaerobic ammonia oxidation, and its denitrification efficiency was lower than 0 mmol·L^-1. In the whole cycle, when the concentration of K⁺ was 8 mmol·L^-1, it achieved the best effect, the average removal rates of NH₄⁺-N and NO₂^--N were 89.24% and 84.87%, and NRR was 1.113 kg·(m³·d)^-1.