硫磺/硫铁矿自养反硝化系统脱氮性能

基于硫自养反硝化作用，寻求一种经济、快速、高效地污水脱氮工艺，采用硫磺/硫铁矿组合进行自养反硝化脱氮试验，以低C/N市政污水为处理对象，分别考察温度，硫磺与硫铁矿体积比和HRT等理化因素对反应器脱氮性能的影响.结果表明，在进水TN质量浓度约40 mg·L^-1条件下，1号反应器最佳HRT为2.5 h，TN去除率平均稳定在72.2%，出水TN约10.55 mg·L^-1；2号反应器最佳HRT为3.5 h，TN平均去除率约67.8%，出水TN平均稳定至12.90 mg·L^-1；3号反应器最佳HRT为3.5 h，TN平均去除率60.6%，出水TN稳定在15.00 mg·L^-1左右.硫磺/硫铁矿自养反硝化系统比硫铁矿自养反硝化系统启动快；该系统脱氮效率随着硫磺与硫铁矿体积比减小而降低；该系统脱氮性能对温度的变化并不敏感，脱氮性能优于单独以硫铁矿为硫源的自养反硝化系统；系统中硫自养反硝化过程的主要功能菌属是Sulfurimonas和Thiobacillus，在3个反应器所占比例为1号 > 2号 > 3号.

Nitrogen Removal Performance of a Sulfur/Pyrite Autotrophic Denitrification System

In order to search for an economical, rapid, and highly efficient nitrogen removal process for sewage, a sulfur/pyrite packed column reactor was fed with low C/N municipal sewage. The effects of temperature, the sulfur-to-pyrite volume ratio, and hydraulic retention time (HRT) on nitrogen removal were studied. The results showed that with an influent total nitrogen (TN) of 40 mg·L^-1, the optimal HRT of the No.1 reactor was 2.5 h, and the removal rate and effluent concentration of TN were stable at 72.2% and 10.55 mg·L^-1, respectively. The optimal HRT of the No.2 reactor was 3.5 h, and the removal rate and effluent concentration of TN were stable at 67.8% and 12.90 mg·L^-1, respectively. The optimal HRT of the No.3 reactor was 3.5 h, and the removal rate and effluent concentration of TN were stable at 60.6% and 15.00 mg·L^-1, respectively. The sulfur/pyrite autotrophic denitrification system starts faster than the pyrite autotrophic denitrification system. Its nitrogen removal rate decreased with decreasing sulfur-to-pyrite volume ratio. The nitrogen removal performance of the system is not sensitive to temperature, and the denitrification performance is better than that of the system with pyrite alone as the sulfur source. The main functional bacteria in the system are Sulfurimonas and Thiobacillus, and the proportion of the sum of these two bacteria in the three reactors decreased from No.1 to No.3.