含氮化合物对兼养脱硫反硝化的影响

Effects of nitrous compounds on mixotrophic desulfurization-denitrification

为处理含有硫化物和有机物的废水,应用兼养脱硫反硝化缺氧附着生长反应器,并引入硝酸盐和亚硝酸盐作为电子受体.进水硫化物和有机物质量浓度分别为200 mg/L和20 mg/L,去除率分别达到99.9%和89.2%.在化学氧化和微生物氧化的共同作用下,硫化物转化为硫酸盐的比例为40%.反应器内自养反硝化与异养反硝化同时发生,异养反硝化的比例为21.76%.同时,针对亚硝酸盐负荷、亚硝酸盐与硝酸盐比例、氨氮负荷等含氮化合物参数对兼养脱硫反硝化的影响进行研究.结果表明:当NO2-负荷为50 mg/(L.d)、亚硝酸盐与硝酸盐的比为2、NH4+负荷为50 mg/(L.d)时,脱氮除硫的效果较好.

An anoxic attached -growth bioreactor packed with porous sponges was started to treat the wastewater containing sulfide and TOC. The nitrate and nitrite were introduced as electron acceptors for mixotrophic desulfurization - denitrification. The concentrations of sulfide and TOC were 200 mg/L and 20 mg/L and the removal efficiencies of them were 99.9% and 89.2% , respectively. The generating efficiency of sulfate reached 40% under the chemical and biological oxidation conditions. The autotrophic denitrification and heterotrophic denitrification took place in the bioreactor and the proportion of heterotrophic denitrification was 21.76%. The impact factors such as nitrite loading rates, ratios of nitrite to nitrate and ammonium loading rates were studied as well. The results showed that the nitrite loading rate of 50 mg/（ L·d） , the ratio of nitrite to nitrate of 2 and the ammonium loading rate of 50 mg/（L·d） were advantageous for the desulfurization and denitrification.