HABR系统实现固相异养与单质硫自养集成反硝化试验

采用连续流运行方式,将含NO₃--N的原水依次通过HABR(复合式厌氧折流板反应器)内添加木屑(第1系统)和硫磺颗粒(第2系统)的2个系统,在温度为(25±1)℃的条件下,将NO₃--N容积负荷由72g/(m3·d)逐渐提高至80和96g/(m3·d),在不需投加传统型外加碳源的条件下实现了固相异养与单质硫自养的集成反硝化. 结果表明:进水NO₃--N容积负荷为96g/(m3·d)时,系统NO₃--N总去除率达到99.0％,第1系统和第2系统对NO₃--N的去除率贡献各为50.0％；系统出水ρ(COD_Mn)为5.74～10.05mg/L,ρ(SO₄2-)为405～870mg/L,并且没有NH₄+-N和NO₂--N的积累. 第1系统产生的碱度能部分中和第2系统内产生的酸,进水、第1系统、第2系统出水pH分别为7.5、7.5～7.6、6.5～7.2,使硫自养反硝化系统呈现出较强的pH平衡能力,不需外加石灰石调节碱度即可为反硝化细菌提供较适宜的中性生存环境. 系统在pH平衡能力和NO₃--N去除效果2个方面均表现出良好的协同作用,并且通过集成反硝化作用弥补了2个系统单独运行时反硝化过程效率低的缺点,较传统异养型生物反硝化降低了运行成本. 

Solid-Phase Heterotrophic Denitrification and Sulfur Autotrophic Denitrification Combined Process in HABR System

Solid-phase heterotrophic denitrification and sulfur autotrophic denitrification were successfully coupled in Hybrid Anaerobic Baffled Reactor (HABR) system without adding traditional carbon source. The sawdust and sulfur granules were filled in two systems of HABR respectively as the reactive medium for the removal of nitrate in raw water. In continuous operation, the effluent of the first system was treated by the second system while alkalinity produced by the first system can neutralized the acid produced in the second system. During this process, the water-bath temperature was (25±1)℃ and the NO₃--N volume loading of raw water varied as 72,0, 96g/(m3·d).The experimental results demonstrated that the removal efficiencies of NO₃--N was 99.0％without the accumulation of NH₄+-N and NO₂--N. The NO₃--N removal percentage of each system was 50.0％, while the NO₃--N volume loading was 96g/(m3·d).The ρ(COD_Mn), ρ(SO₄2-) of effluent were 5.74-10.05,5-870mg/L. The integrated system had the capacity of pH balance, therefore the limestone for pH adjustment in sulfur autotrophic denitrification was not necessary in this combined process. The influent pH was 7.5, and the effluents of two systems were kept neutral at optimum operation conditions. In general, the HABR integrated system perfectly showed synergy in two aspects:pH balance capacity and integrated denitrification effects. Compared with the conventional biological heterotrophic denitrification, the integrated system reduced costs and enhanced the denitrification efficiency.