COD/SO42-值对硫酸盐废水厌氧消化的影响

采用间歇试验方式,研究了COD/SO₄^2-值对硫酸盐废水厌氧消化的影响.试验结果表明,COD/SO₄^2-值是影响厌氧消化处理效果的主要参数.本试验中,COD/SO₄^2->15,硫酸盐还原作用对厌氧反应器影响甚微;COD/SO₄^2-=5-15时,硫酸盐还原作用对厌氧反应器产生轻度抑制,相对产甲烷率为79.2%-94.7%;COD/SO₄^2-=0.5-5时,反应器受中度抑制,相对产甲烷率为61.6%-79.2%;COD/SO₄^2-<0.5时,反应器受严重抑制.COD/SO₄^2-≥1时,相对产甲烷率与COD/SO₄^2-值之间有很好的线性关系.

The Effect of COD/SO42- Ratio on the Anaerobic Digestion of Sulfate Wastewater

The effect of COD/SO₄^2- ratio on anaerobic digestion of sulfate containing high strength organic wastewater was studied with batch test method. Experimental results show that COD/SO₄^2- ratio is an important factor which influences the anaerobic digestion of the wastewater. In this study, when COD/SO₄^2- was more than 15, the reduction of sulfates hadlittle or basically no inhibition effect on the anaerobic digestion. When COD/SO₄^2- was between 5 to 15, the reducti-on of sulfates had slight inhibition effect on the anaerobic digestion and the relative methane-producing rate was 79.2% to 94.7% When COD/SO₄^2- was 0.5 to 5, the inhibition effect of sulfate reduction on anaerobic digestion was moderate and the relative me-thone-producing rate was 61.6% to 79.2% When COD/SO₄^2- was below 0.5, the anaerobic digestion would be severely inhibited. Experimental results also show that when COD/SO₄^2- was greater than 1, a limear relationship between relative methane-producing rate and COD/SO₄^2- ratio existed.