杭州西湖风景名胜区园林废弃物生产生物能源潜力

Potential of bioenergy production from garden wastes in West Lake scenic spots of Hangzhou,China

在当前我国景区节能减排目标难以达到的情况下,发展生物能源将为此提供一个途径。本文以杭州西湖风景名胜区为案例,分析园林管理所获得的可用生物量及其生产生物能源的潜力。通过实地测定和问卷调查,研究表明:单位绿地面积园林废弃生物量为(4.60±3.12)t·hm-2·a-1;道路区域绿地的单位面积废弃物产量最高,干重平均值为5.96t·hm-2·a-1;产生绿化废弃物的主要植物种类有香樟(Cinnamomum camphora)、桂(Os-manthus fragrans)、杜鹃(Rhododendron simsii)等;园林废弃物总量干重为3402t·a-1,可产生能量6.3×1010kJ·a-1,理论上可以抵消景区40%的电能消耗;园林废弃物转化为生物能源适宜采用固体成型生物燃料技术;利用园林废弃物生产生物能源替代化石燃料每年可减排CO24177t。开发利用景区园林废弃物生产生物能源,可实现减轻环境压力和增加生物能源供应的双赢。

The development of bioenergy may provide a solution to achieve the reduction targets for scenic spot emissions.This paper provides a synthesis of questionnaire survey and experimental data to assess the potential of garden waste biomass for renewable energy production in West Lake of Hangzhou.Our results showed that the waste dry biomass from greenspace reaches 4.60±3.12 t·hm-2·a-1.The garden waste dry biomass from greenspace in the road area was 5.96 t·hm-2·a-1 which was higher than the other area.The main species of the garden wastes were Cinnamomum camphora,Osmanthus fragrans and Rhododendron simsii.The total amount of dry biomass from scenic wastes was estimated at 3402 t·a-1.The total potential biofuel produced as scenic waste biomass was estimated at 6.3×1010 kJ·a-1,which accounts for 40% of the energy consumption for the West Lake.The wood pellets production bioenergy system was the best way for the garden waste biofinery.The emission reduction of using garden waste for energy production to alternative fossil fuels would be 4177 t CO2 per year.The use of garden wastes in scenic area for energy production could be a win-win approach for the reduction of environment stress and the increase in the energy supply.