污泥改性黄土对胡麻生长及Cd、Ni、Pb的吸收实验  

Effects of Loess Modified by Sludge on Flax Growth and Accumulation of Cd,Ni and Pb:A Pot Experiment

作　　者：李勃 李国梁[2] 曾正中[2] 苟剑锋[2] 高冬香[2] 南忠仁[2] 

机构地区：[1]中国市政工程西北设计研究院有限公司,甘肃兰州730000 [2]兰州大学资源环境学院,甘肃兰州730000

出　　处：《环境科学与技术》2016年第9期65-70,共6页Environmental Science & Technology

基　　金：国家自然科学基金:城市污泥黄土改性后重金属形态的转化及其生物效应(51178209)

摘　　要：通过堆肥污泥改性黄土盆栽胡麻实验,研究了不同污泥施入量对胡麻幼苗生长及植株Cd、Ni、Pb吸收的影响。实验结果表明,随着污泥施入量的增加,混合基质中有机质、TN、TP和重金属的含量均有不同程度提升,p H逐渐减小并趋于中性;污泥施入量为1%时胡麻种子的发芽时间明显缩短、发芽率提高、幼苗株高增加,且F_1相比对照实验胡麻幼苗F_0生物量增加了3.79%,该条件下幼苗茎秆茎干对中Cd、Ni、Pb的吸收率分别为9.30%、1.29%和1.43%;施入量超过25%后胡麻种子的发芽和生长受到严重抑制。得出:堆肥污泥施入量控制在6.75~7.5 t/hm^2可以有效改善黄土性土壤的种植条件,有望提高该地区胡麻的产量。Loess modified with WWTP sludge that had been composted with wheat stalk was used in a pot experiment, in which flax seedling growth and heavy meal such as Cd, Ni and Pb absorbed by flax were studied. With the application of composted sludge content of organic matter, TN, TP and heavy metal was increased in pot soil, the ＂mixed media＂, while pH increased tending to neutral. On the other hand, flax seed germination time was shorten when 1% of the composted sludge was applied, the germination rate and height of crop was raised simultaneously; the biomass increased by 3.79% compared with F1, the value of control; and the rate of flax accumulation of Cd, Ni and Pb in flax were 9.30%, 1.29% and 1.43%, respectively. However, flax seed germination and growth were severely inhibited when the content of sludge applied was beyond 25%. In conclusion, WWTP sludge after composting treatment, in a proper amount, applied into loess at the level ranging between 6.75-7.5 t/hm2 could improve flax growing conditions, hopefully to increase the output of flax in the area.

关 键 词：堆肥污泥 黄土 胡麻 重金属 

分 类 号：X705[环境科学与工程—环境工程]