警惕人造"绿色沙漠"

全国绿化委员会办公室3月12日发布的《2003年中国国土绿化状况公报》显示,2003年,全国造林绿化速度取得了历史性突破,共完成造林和封育面积1109．51万公顷,使当年我国国土绿化面积首次超过国土面积的1％。     

我理想的城市

欣闻北京在筹备第二道绿化隔离带的规划编制,作为香港一个环保工作者,一个非北京市居民,我只能提供一些概括性的想法。理想的北京城市是怎样的？     

"绿化"最终不是为了"美化"

6月30日《新京报》报道了关于舶来草破坏园林生态的讨论,看后不禁有些感想：绿化的目的到底是什么？     

日本的废弃物与环境商机

在日本．用掩埋手段来处理垃圾的方法已变得越来越难。目前虽然在狭窄的日本各处掩埋了各式各样的垃圾．但处理场周围住户的反对意见越来越多．所以处理场的容量已变得越来越小。例如．工业废弃物用的掩埋处理场的残余容量已只剩下了近4年．特别是首都圈(东京、千叶、玉、神奈川、木、群马、山梨)里已只剩下1．2年。用来掩埋从家庭和办公室出来的一般废弃物(都市垃圾)的处理场也只剩下12．2年。     

城市垃圾与污水厂污泥的混合堆肥研究

本文对城市垃圾和污水厂污泥混合堆肥的最佳配比，最佳工艺条件进行了实验研究。耗氧速率是较好的腐熟度评价指标，腐熟时其值为０．０２％。     

城市垃圾填埋场中废气测定方法

本文介绍了城市垃圾填埋场中的废气用注射器采样．经气相色谱热导池检测器测定的方法．该方法具有简单、快速、成本低、准确性高、精密度好等优点，由本方法测得的城市垃圾填埋场废气中甲烷和二氧化碳含量可作为设计沼气回收利用的可靠依据。     

Removal of high concentrated ammonia nitrogen from landfill leachate by landfilled waste layer

The landfill of municipal solid waste(MSW) could be regarded as denitrification reactor and involved in ammonia nitrogen biological removal process. In this research, the process was applied to municipal solid waste collected in Shanghai, China, which was characterized by high food waste content. The NH4^ removal efficiency in the system of SBR nitrifying reactor followed by fresh and matured landfilled waste layer in series was studied. In the nitrifying reactor, above 90% of NH4^ in leachate was oxidized to NO2^- and NO3^- . Then high concentrated NO2^- and NO3^- were removed in the way of denitrification process in fresh landfilled waste layer. At the same time, degradation of fresh landfilled waste was accelerated. Up to the day 120, 136.5 gC/(kg dry waste) and 17.9 gN/(kg dry waste) were converted from waste layer. It accounted for 50.15 % and 86.89 % of the total carbon and nitrogen content of preliminary fresh waste, which was 4.42 times and 5.17 times higher than that of reference column respectively. After filtering through matured landfilled waste, BOD5 concentration in leachate dropped to below 100 mg/L, which would not affect following nitrification adversely. Because the matured landfilled waste acted as a well methanogenic reactor, 23% of carbon produced accumulatively from fresh landfilled waste degradation was converted into CH4.     

船舶垃圾污染海洋的成因及对策

船舶垃圾处理与保护海洋资源，维持海洋环境的可持续发展是一个非常重要的课题，本文阐述了船舶垃圾对海洋环境已经和可能造成的污染危害，分析了造成这些污染问题的原因论述了ＭＡＲＰＯＬ７３／７８国际公给及我国相应法规中对船舶垃圾的处理要求，针对这些问题，提出了我们应采取的措施及对策。