Case Study on Semiaerobic Landfill System in Cities of China

发展中国家的垃圾填埋场主要以露天倾倒或控制倾倒的方式运作。这样的行为正在造成重大的环境污染。在未来，即使采用中间处理技术，如回收资源、焚烧等，也需要最终的处置场所。从这个角度出发，对现有垃圾填埋场进行改进是提高卫生填埋场水平的一个重要方面。我们对中国所在的主要城市(北京、西安、长海、广州)的垃圾填埋场进行了3年的调查，提出了一条从露天垃圾填埋场到卫生填埋场的道路。本研究的主要成果如下：1)城市固体废物资源化回收利用活跃；2)现有垃圾填埋场多为厌氧填埋型，无排气系统，存在爆炸危险；3)作为垃圾填埋场加固的技术手段，我们在广州市垃圾填埋场设置了低成本的排气管。4)在本案例研究中，利用竹子、废渣罐和建筑垃圾作为排气管道，降低了建设成本。5)好氧填埋系统将有效地加速垃圾填埋场的稳定，这些案例都是中国缺乏工程师和财力的情况下从露天倾倒垃圾填埋场向卫生填埋场改进的例子。这些研究成果也得到了中国在垃圾处理和管理领域的技术合作的高度评价。

Landfill sites in developing countries are mainly operated as the open dumping or the controlled tipping. such action is causing major environmental pollution. In the future, even though the intermediate treatment technology is adopted, such as a recovery of resources, an incineration and others, final disposal sites will be needed. From this point of view, the improvement of existing mlandfill site is an important for upgrading to the level of sanitary landfill.We investigated the landfill sites in major cities (Beijing, Xi'an, Changhai, and Guangzhou) of China for 3 years, and proposed a road to sanitary landfill from open dumping. The main results of this research are as follows ;1) In urban area, resource recovery and recycling from solid wastes were active.,2) Most of the existing landfill sites had a risk of explosion because they were an anaerobic landfill type without the gas venting system.,3) As the technical method for the stabilization of the landfill site, we set up the low cost typed gas venting pipes on the landfill site in Guangzhou.,4) On this case study, the bamboo, the useless srum cans and the construction debris were used as the gas venting pipes, so that the construction cost could be decreased.,5) The semiaerobic landfill system will be effective to accelerate the stabilization of landfill site.These case studies are the examples of improvement from the open dumping to the sanitary landfill, where is a lack of engineers and financial resources in China. And also these results from this research were high evaluated on the technical cooperation in the field of waste disposal and management in China.