Cd在污泥厌氧消化中的检测及其对产沼气的抑制研究
Detection of Cd in Sludge Anaerobic Digestion and Its Inhibition on Biogas Production
王英1
作者信息
- 1. 山西职业技术学院,山西 太原 030006
- 折叠
摘要
为了研究重金属Cd对污泥厌氧消化产甲烷的影响,在序批式反应器中,通过控制进料中Cd的浓度,分析了Cd在污泥处理系统内的检出与去除规律,以及Cd对污泥厌氧消化产甲烷的影响.研究结果表明,石墨炉原子吸收光谱法能有效检测污泥中Cd的浓度,且Cd的初始浓度会影响Cd的去除效率;浓度>1.0 mg·L-1的Cd抑制了污泥厌氧消化产甲烷,最低甲烷产量为 77.9 mL·g-1;Cd降低了污泥厌氧消化内有机质的水解,5.0 mg·L-1的Cd暴露组中溶解性COD和挥发性脂肪酸(VFA)的最大值分别为 1 455 mg·L-1 和794 mg·L-1,低于对照组.高浓度Cd会降低污泥减量率,至24.5%,增加了污泥后续处理的难度.
Abstract
In order to study the effect of heavy metal Cd on methane production of sludge anaerobic digestion,the detection and removal rules of Cd in sludge treatment system and the effect of Cd on methane production of sludge anaerobic digestion were analyzed by controlling the concentration of Cd in the sequencing batch reactor.The results indicate that graphite furnace atomic absorption spectrometry can effectively measure the concentration of Cd in sludge,and the initial concentration of Cd affects its removal efficiency.Cd concentrations exceeding 1.0 mg·L-1 inhibited methane production in sludge anaerobic digestion,with the lowest methane yield recorded at 77.9 mL·g-1.Cd reduced the hydrolysis of organic matter in sludge anaerobic digestion,and the maximum values of soluble COD and volatile fatty acids(VFA)in the group exposed to 5.0 mg·L-1 Cd were 1 455 mg·L-1 and 794 mg·L-1,lower than the control group.Furthermore,high concentrations of Cd also reduced the sludge reduction rate to 24.5%,increasing the difficulty of subsequent sludge treatment.
关键词
重金属Cd/污泥/厌氧消化/石墨炉原子吸收光谱法Key words
heavy metal Cd/sludge/anaerobic digestion/graphite furnace atomic absorption spectrometry引用本文复制引用
出版年
2024
NETL
NSTL
万方数据