摘要
在生活污水中添加不同种类不同体积质量的重金属离子, 研究了重金属离子对有效微生物群(Effective M icroorganism s,简称EM )去除生活污水化学需氧量(CODcr)的影响.结果表明:重金属对EM 有毒害作用,且体积质量越高,毒害作用越大;当其它条件保持不变时,CODcr 的去除率随重金属离子体积质量的增加而逐渐减少;另外,不同的重金属离子对EM 的降解能力影响也不同,其中,Hg2+ ,As3+ 的毒性最大,Zn2+ ,Pb2+ 的毒性最小;EM 对污水中重金属离子的耐受体积质量分别是,对 As3+ 的耐受体积质量为0. 05 m g ·L- 1, Hg 2+ 为 0. 10 m g · L- 1, Cu2+ 为 0. 50 m g ·L- 1, Cr6+ 为 0. 50 m g ·L- 1, Cd2+ 为 0. 50 m g ·L- 1, Zn 2+ 为1.00 m g·L- 1,Pb2+ 为1.00 m g·L- 1.总之,用EM 处理生活污水时。
In this paper, the effect of heavy metals on the ability of Effective Microorganisms(EM) purifying domestic sewage was studied by adding 7 kinds of solutions containing different contents of Cu 2+ ,Zn 2+ ,Pb 2+ ,As 3+ ,Cr 6+ ,Cd 2+ and Hg 2+ to sewage.The results showed that every kind of heavy metal could poison EM ,and the higher the concentration of heavy metals in domestic sewage, the more serious the poisoning. When other conditions were given, the removal rate of CODcr was gradually reduced with the increase of heavy metals' concentration. In addition, each heavy metal had its own extent of effect on the ability of EM. Among 7 heavy metals, As 3+ and Hg 2+ had the strongest toxicity to EM; however, Zn 2+ ,Pb 2+ had weaker toxicity than others. The tolerance of EM to heavy metals were listed as follows: Cu 2+ 0.10 mg·L -1 ; Zn 2+ 1.0 mg·L -1 ;Pb2+ 1.0 mg·L -1 ;As3+ 0.05 mg·L -1 ;Cr 6+ 0.5 mg·L -1 ; Cd 2+ 0.5 mg·L -1 ;Hg 2+ 0.1 mg·L -1 . Generally, it is quite necessary to maintain lower concentrations of heavy metals in domestic sewage before using EM to purify it.
出处
《中南林学院学报》
CSCD
1999年第3期37-41,共5页
Journal of Central South Forestry University
基金
中国-挪威国际合作项目
中南林学院青年科研基金