一体式厌氧-好氧流化床反应器同步脱氮除硫实验

Simultaneous biological removal of nitrogen and sulfur by denitrification in anaerobic-aerobic integrated reactors

采用一体式厌氧-好氧流化床反应器处理含氮和含硫化物的废水,分别考察了硫氮比(硝氮和亚硝氮)、碳氮比(氨氮)等因素对同步脱氮除硫效果的影响,并对厌氧区固体产物进行了分析.实验结果表明:混养条件下获得了较好的脱氮、脱硫、去除COD的效果;S2-浓度增加对厌氧COD去除、反硝化过程无显著影响;当S2-浓度小于4.6mmo.lL-1时,对厌氧氨氮去除有一定的促进作用.S/N(NO3--N和NO2--N)在0.2～1.7范围内,可以获得20%～75%单质硫转化率.C/NH4+-N的降低对厌氧脱氮效果无明显影响,但可促进硫化物的去除.X射线衍射分析表明,厌氧区固体产物为单质硫.好氧进水中硫化物浓度增加对好氧区COD去除影响不明显,但S2-浓度大于15mg·L-1时会对硝化过程产生明显抑制.

Anaerobic-aerobic integrated reactors were used to treat wastewater containing nitrogen and sulfide. The effect of C/NH4^＋ -N and S/N （NO3- -N and NO2- -N） on simultaneous biological removal of nitrogen and sulfur was studied. The results show that simultaneous removal of sulfide, nitrogen and COD as well as elemental sulfur accumulation could be achieved under mixotrophic conditions. It was shown that an increase of sulfide concentration showed little inhibition of COD removal rate and denitrification in the anaerobic area. The NH4^＋-N removal effect was promoted when the sulfide concentration was less than 4.6 mmol. L^-1. A 20% ～ 75 % So production rate was achieved when S/N was 0.2 - 1.7. The decrease of C/NH4＋ -N had no obvious effect on denitrification, but it promoted sulfide removal. The X-ray diffraction result indicates that the product from the anaerobic area is elemental sulfur. In the aerobic area, the increase of sulfide concentration had no obvious influence on COD removal, while it inhibited the nitrification process remarkably at sulfide concentrations more than 15 mg·L^-1.