丙酸钾污泥稳定化过程中硫化氢的释放规律

Effects of potassium propionate on hydrogen sulfide volatilization from sewage sludge

作为国家规定的8种恶臭气体之一,硫化氢是污泥中微生物作用于含硫物质的终点产物,在污泥的储存和安全运输过程中控制或抑制其释放至关重要.本研究以丙酸钾作为污泥稳定化添加剂,通过测定污泥pH值的变化及硫化氢的释放情况,分析不同添加量的丙酸钾、pH与硫化氢释放量的关系,从而说明污泥稳定化效果.研究结果表明,丙酸钾对污泥硫化氢释放有抑制作用,随pH升高、储存时间延长抑制效果有所减弱;丙酸钾的添加量越大,硫化氢的释放量越小,污泥稳定的时间越长;氮气环境更有利于丙酸钾对污泥的稳定化作用.

Hydrogen sulfide is one of the eight odorous gases,which is produced by sulfate-reducing bacteria. It is vital to control the release of hydrogen sulfide during the starage and transportation of sludge. In this study,we investigated the effects and mechanisms of pH and potassium propionate on hydrogen sulfide volatilization from sewage sludge. The result indicated that the amount of potassium propionate exerted obvious effect on the sludge and hydrogen sulfide emission. With increase addition of potassium propinate,less hydrogen sulfide was released. Moreover,the inhibition was observed to be prominent with the increase of pH value as well as time. In addition,the effect of sludge stabilization was better in nitrogen atmosphere.