沸石SBR/缺氧上升流污泥床实现氧化铁红废水脱氮

采用沸石序批式反应器(ZSBR)与缺氧上升流污泥床反应器(A-USB)组合工艺处理氧化铁红高氨氮废水,探究ZSBR稳定亚硝化特性以及组合工艺的脱氮性能。结果表明,通过游离氨(FA)抑制亚硝酸盐氧化菌(NOB),ZSBR可实现稳定高效的完全亚硝化。在进水NH4+-N浓度约为700 mg/L的情况下,ZSBR的出水NH4+-N基本稳定在30 mg/L以下,亚硝化率(NAR)维持在95%以上,平均亚硝酸盐产率(NPR)最高可达0. 68 kg/(m³·d)。提升外回流比能够有效利用A-USB反硝化产生的碱度并减少ZSBR中碳酸氢钠碱度的投加量。以葡萄糖作为外加碳源进行反硝化试验,ZSBR出水经过A-USB反硝化处理后,总氮去除率(NRE)能够较稳定维持在85%以上,最高总氮去除负荷(NRR)可达5. 10 kg/(m³·d)。高通量测序分析表明,ZSBR样品中AOB(Nitrosomonas)的相对丰度达到了50. 93%,未检测出NOB,而具有反硝化功能的副球菌属、丛毛单胞菌属和假单胞菌属的相对丰度总占比可达7. 05%,进一步验证了组合工艺高效且稳定的脱氮性能。

Denitrification of Iron Oxide Red Wastewater with High Ammonia Nitrogen by Zeolite Sequencing Batch Reactor Combined with Anoxic Up-flow Sludge Blanket Reactor

The combined process of zeolite sequencing batch reactor( ZSBR) and anoxic up-flow sludge blanket reactor( A-USB) was applied to treat iron oxide red wastewater with high ammonia nitrogen. The characteristics of stable nitritation of ZSBR as well as nitrogen removal performance of combined process were investigated. Results showed that based on inhibition on nitrite oxidation bacteria( NOB) by free ammonia( FA),ZSBR could successfully achieve stable and sufficient full nitritation of iron oxide red wastewater. when NH4+-N concentration in the influent was about 700 mg/L,the effluent NH4+-N in ZSBR could be lower than 30 mg/L,with nitrite accumulation rate( NAR) higher than 95%and a maximum average nitrite production rate( NPR) of 0. 68 kg/( m³·d). The alkalinity produced by A-USB denitrification could be effectively utilized and the amount of NaHCO3 of ZSBR could be reduced by increasing the external reflux ratio. The denitrification was carried out with glucose as the external carbon source. After denitrification in A-USB, total nitrogen removal efficiency( NRE) could be maintained above 85% and the maximum total nitrogen removal loading rate could be up to 5. 10 kg/( m³·d). It was demonstrated by high-throughput sequencing analysis that the relative abundance of AOB( Nitrosomonas) was 50. 93% and no NOB was detected,while the total relative abundance ratio of Paracoccus,Comamonas and Pseudoxanthomonas mexicana with denitrification function was up to7. 05%,which further demonstrated the efficient and stable denitrification performance of the combined process.