氢自养反硝化细菌对纳米铁沉降性能的影响

Effect of hydrogenotrophic bacteria on sedimentation of nanoscale zero-valent iron

通过静态沉降实验,考察了氢自养反硝化细菌(HTB)在不同水质条件下对纳米零价铁(nZVI)沉降性能的影响。结果表明:当体系中腐殖酸(HA)质量浓度为10 mg/L时,1/3HTB对nZVI沉降性的抑制作用最明显。K^+和Ca^2+对nZVI的沉降有促进作用;K^+浓度为3、6 mmol/L时,HTB对nZVI的沉降性有抑制作用,在不同浓度Ca^2+条件下,HTB对nZVI的沉降性均有促进作用,可加速nZVI的沉降。

Static sedimentation experiments were conducted to investigate the effects of hydrogenotrophic bacteria(HTB)on the sedimentation of nZVI under different water quality conditions.The experimental results showed that when the concentration of HA in the system was 10 mg/L,1/3HTB had the most obvious inhibitory effect on the sedi-mentation of nZVI.Both K+and Ca^2+promoted the sedimentation of nZVI.When the concentration of K^+in the system was 3 or 6 mmol/L,HTB inhibited the sedimentation of nZVI.However,when Ca^2+was present in the system,HTB ac-celerated the sedimentation of nZVI.