缺氧附着生长反应器同步脱氮除硫除碳运行效果探讨

在缺氧环境下,应用附着生长反应器,通过降低水力停留时间增加进水底物负荷,对废水中硫化物,硝酸盐、亚硝酸盐和有机物等污染物质的降解情况进行了研究.结果表明,进水硫化物、硝酸盐氮、亚硝酸盐氮和有机物浓度分别为200、52.5、20和20mg/L,去除率分别达到99%、99%、95.5%和80%,实现了兼养脱硫反硝化氮、硫、碳的同步去除.随着底物负荷的增大,硝酸盐和亚硝酸盐对冲击负荷的适应性逐渐变小;硝酸盐降解对进水负荷冲击的适应性强于亚硝酸盐;与增加进水负荷对反应器带来的冲击相比,缺氧环境的破坏对硝酸盐和亚硝酸盐的降解影响大;去除硫化物的60%被生物氧化为单质硫;缺氧反应器中发生了自养反硝化和异养反硝化作用,自养反硝化占主导地位,异养反硝化的发生力度为21.76%.

Simultaneous Removal of Sulfide, Nitrogenous Compounds and Organic Carbon by Anoxic Attached-Growth Bioreactor

By decreasing hydraulic retention times to increase substrates loading rates under anoxic conditions, an attached-growth bioreactor packed with porous sponge was started to treat the wastewater contaminated by sulfide, nitrate, nitrite and organic carbon. The influent concentrations of sulfide, nitrate, nitrite and TOC were 200mg/L, 52.5mg/L, 20mg/L, 20mg/L and relevant removal rates were 99%, 99%, 95.5% and 80% respectively. The simultaneous removal of nitrogenous compounds, organic carbon and sulfide was achieved by the desulfurization and denitrification process. With increasing of the substrate loading rates, the adaptabilities of nitrate and nitrite to influent shock load decreased. The adaptability of nitrate to shock load was better than that of nitrite. Compared with the impact on the bioreactor brought by the increasing of influent shock load, the destruction of anoxic environment had greater influence on the degradation of nitrate and nitrite. 60% of the removed sulfide was converted to sulfur by microorganisms. The dominant reaction of autotrophic denitrification occurred together with the heterotrophic denitrification whose percent was 21.76%.