Responses and Remediating Effects of Pennisetum hydridum to Application of Heavy-Metals-Contaminated Chicken Manures and Sewage Sludges

• Main Authors: WANG Xi-na, YI Zi-cheng, ZHANG Yao-fen, WANG Jing-qi, ZHANG Yu-jie, LI Hua-shou
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2015-10-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: Pennisetum hydridum; heavy metal; sewage sludge; chicken manure; phytoremediation
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2015/5/20150509.htm
• ISSN: 2095-6819; 2095-6819

Pennisetum hydridum is a rapid growth, large biomass and multi-stress resistant plant. A pot experiment was carried out to investigate the bioremediation effects of P. hydridum by 2 kg heavy metal (Cd, Cu, Pb, and Zn) contaminated chicken manure or sewage sludge mixing with 18 kg of lateritic red soil. The growth and heavy metal uptake of P. hydridum were measured in order to assess the phytoremediation potential. Results showed that P. hydridum growed well in all treatments and the best appeared in chicken manure. The biomass of plant in treatments with chicken manure, sewage sludge, and the control was 736.56±29.21, 499.99±32.01 g·pot-1, and 466.89±37.08 g·pot-1, respectively. The heavy metals in the soils were reduced significantly at the 200 d after planting P. hydridum in fall. The removing percentage of total Zn, Cu, Pb, and Cd in soil was 1.90%~4.52%, 3.96%~5.72%, 0.53%~1.24% and 10.34%~17.14% respectively. The best effect of removing Zn, Cd and Pb appeared in chicken manure treatment was 89.74, 0.68 mg and 19.18 mg. The best effect of removing Cu appeared in sludge treatment was 16.84 mg. The results indicated that P. hydridum could be used for removement of the heavy metals from the heavy metal contaminated soils which could be considered as an potential plant for bioremediation of heavy metals.