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污染控制技术及原理

Start-up of a coupled reactor for nitrogen removal from swine wastewater and sulfide removal from biogas

摘要：采用鼓泡反应器研究猪场废水脱氮与沼气脱硫耦联反应器的启动,比较了启动过程中不接种污泥、接种厌氧污泥及接种好氧污泥对启动时间及效能的影响.结果表明,接种好氧污泥的反应器在第32d时氮硫同步去除率达到60%以上;不接种污泥的反应器氮硫同步去除率达到60%需要36d;而接种厌氧污泥的反应器则需要50d.成功启动后,在温度为30～32℃、空塔停留时间为9.75min、水力停留时间为4.78d、沼气中H₂S浓度为1.70g·m^-3左右及进水NO_x-N浓度为109mg·L^-1的条件下,不接种污泥反应器,接种厌氧污泥反应器和接种好氧污泥反应器的NO_x-N去除率分别97%、91%、99%,硫化氢的去除率分别稳定在82%、78%和86%左右.接种好氧污泥的反应器硫化氢去除率最高可达92.3%.运行稳定后,3个反应器均可实现按相对固定的比例同时去除硫和氮,废水脱氮与沼气脱硫得到了很好耦联,在1个反应器中可以同时实现废水脱氮与沼气脱硫.

Abstract：Abubble column reactor was used to study the start-up of a coupled reactor for nitrogen removal from swine wastewater and hydrogen sulfide removal from biogas. The start-up time and performance of the reactors were investigated after startup without sludge or after inoculation with anaerobic or aerobic sludge. It took 32 d to reach a 60% simultaneous removal rate for NO_x-N and H₂S % in the reactor inoculated with aerobic sludge,36 d without sludge,and 50 d with anaerobic sludge. After a successful start-up,the NO_x-N removal rates of the three reactors reached 97% without sludge,91% after inoculation with anaerobic sludge and 99% for the reactor inoculated with aerobic sludge and,the hydrogen sulfide removal rates in the three reactors were 82%,78% and 86% respectively. The conditions included a temperature of 30～32℃,gas retention time of 9.75 min,hydraulic retention time of 4.78 d,hydrogen sulfide concentration of 1.70 g·m^-3,and influent NO_x-N concentration of 109 mg·L^-1. The highest hydrogen sulfide removal rate,as much as 92.3%,was realized in the reactor inoculated with aerobic sludge. When the operation was stable,the nitrogen and sulfide were simultaneously removed in a molar ratio (around 0.75),and coupling was realized in a single reactor for removal of nitrogen from wastewater and sulfide from biogas.

Key words：swine wastewater nitrogen removal sulfide removal biogas reactor start-up