摘要
资源化、无害化利用水葫芦是治理其泛滥的有效途径。利用水葫芦去除水体中的营养物并利用其生物质生产沼气在技术上具有可行性,但是其环境经济效益尚不明确。以滇池为例,针对富营养化水体的水葫芦控制进行了成本收益分析。与将水葫芦打捞后填埋处理相比,将所打捞的水葫芦用于生产沼气具有经济可行性和能量效率。与现行的填埋处理法相比,实施沼气项目不但同样能控制水葫芦泛滥,而且能生产能源。此外,填埋水葫芦会释放甲烷这一环境问题值得重视,利用水葫芦生产沼气可以减少温室气体的排放,但减排的价值取决于沼气厂的生产规模。由于将水葫芦填埋和用于生产沼气都能去除水体中的营养物,只有当沼气厂的水葫芦处理量大于当前的填埋量时,沼气项目才具有额外的水质改良价值。在中国关于水污染控制、可再生能源发展和节能减排等政策的背景下,利用水葫芦生产沼气是一种潜在的政策响应。
The bloom of water hyacinth is a common aquatic environmental problem in tropical regions. The use of water hyacinth to remove nutrients from water bodies and to produce biogas is a technologically fea- sible option for the control of water hyaicnth, but its environmental economic performances are not well un- derstood. This study conducts a cost benefit analysis for the control of water hyacinth bloom using data col- lected from Dianchi Lake,China. Comparison was made between the project and the current approach of disposing water hyacinth by landfill. The results reveal that the project is economically feasible with a de- sirable energy gain. The removal of water hyacinth to produce biogas can also contribute to water quality improvement and GHG emission reduction whose values, however, depend on the processing scale of biogas plant. Since both the current approach and the proposed project can remove nutrients from water bodies, additional value of water quality improvement resulting from the project is only possible when the process- ing scale of the biogas plant is greater than the amount of water hyacinth disposed by landfill. The emission of methane deserves more concerns when water hyacinth is disposed by landfill. The project can be a poten- tial option responding to China＇s policies on water pollution control, renewable energy development, and energy saving and emission reduction.
出处
《长江流域资源与环境》
CAS
CSSCI
CSCD
北大核心
2012年第8期972-978,共7页
Resources and Environment in the Yangtze Basin
基金
国家自然科学基金项目(71063024)
加拿大国际发展研究中心(IDRC)项目(106269-00000000-007)
关键词
水葫芦
经济可行性
植物修复
沼气
填埋
water hyacinth
economic feasibility
phytoremediation
biogas
landfill
