我国废弃塑料回收再利用的现状及对策

废旧塑料难于自然降解,所造成的环境污染日趋严重,回收利用为处理废旧塑料垃圾开辟了减量化、无害化、资源化的道路。通过分析我国废弃塑料产生和回收再利用处理技术的现状,进一步探讨了符合我国国情的废旧塑料回收利用对策。     

The construction and management of nature reserves in China

ＴｈｅｃｏｎｓｔｒｕｃｔｉｏｎａｎｄｍａｎａｇｅｍｅｎｔｏｆｎａｔｕｒｅｒｅｓｅｒｖｅｓｉｎＣｈｉｎａＪｉｎＪｉａｎｍｉｎｇＮａｔｉｏｎａｌＥｎｖｉｒｏｎｍｅｎｔａｌＰｒｏｔｅｃｔｉｏｎＡｇｅｎｃｙｏｆＣｈｉｎａ，Ｂｅｉｊｉｎｇ１０００３５，Ｃｈｉｎ...     

城市大气环境系统污染综合防治研究

本文论述了利用大气扩散模型和数学规划模型建立反映城市布局、耗能结构和大气环境质量间制约关系的大气环境、能源、经济规划模型,并以天津市区为例讨论了大气环境污染综合防治方案。     

Effect of ceria on copper/γ-alumina catalysts for carbon monoxide and n-hexane oxidation

Ｅｆｆｅｃｔｏｆｃｅｒｉａｏｎｃｏｐｐｅｒ／γ－ａｌｕｍｉｎａｃａｔａｌｙｓｔｓｆｏｒｃａｒｂｏｎｍｏｎｏｘｉｄｅａｎｄｎ－ｈｅｘａｎｅｏｘｉｄａｔｉｏｎ￥ＪｉａｎｇＸｉａｏｙｕａｎ；ＺｈｏｕＲｅｎｘｉａｎ；ＹｕａｎＸｉａｎｘｉｎ；ＺｈｅｎｇＸｉａｏ...     

液膜分离技术及其在环境分析中的应用

对液膜分离技术的作用、特点及其类型、组成与应用展开讨论，证明该技术具有广阔的应用前景。     

城市生活垃圾热分解特性的试验研究

本文在一台法国Setaram公司生产的TG -DTA92型热重差热分析仪上对 8种典型的城市生活垃圾组分进行了氮气环境下的热重 (TG)、微分热重 (DTG)和差热 (DTA)试验 ,研究了这些典型城市固体废物的热解特性 ,还以废纸为例研究了不同加热速率和不同终温对热解特性的影响 ,获得了它们的热解动力学特性参数 ,提出了相应的热解动力学反应模型。     

三峡库区燃煤,土壤和水库底泥中含汞量分布特征

详细研究了长江三峡库区燃煤，土壤和沉积物中汞的分布特征，以及湖泊沉积物中不同形态汞的含量，探讨了水库汞污染加重原因。     

特种化工废水的生物毒性、抑制性研究

某厂特种有机废水 ,含季铵盐和羟乙基纤维素。研究表明 ,他们在浓度分别超过 1 2 0 mg/L和 2 2 0 mg/L时 ,呈现生物毒性或抑制性 ,且随浓度增高而严重影响废水生化处理效果。当水样中季铵盐浓度小于 1 2 0 mg/L,羟乙基纤维素浓度小于 2 2 0 mg/L时 ,它们不具生物毒性 ,可作为营养物质被微生物利用。废水动态模拟试验表明 ,进水 CODCr30 0 0 mg/L的废水 ,用接触厌氧—好氧生化法能使出水达到当地排放标准。     

火电厂氮氧化物排放量的野外试验研究

本文利用浙江某电厂的大量野外实测资料,分析火电厂的氮氧化物排放量情况,并提出了电厂氮氧化物排放系数,经过实例分析,得到了较满意的结果.     

Atomic force microscopy study on the microtopography of natural organic matter and newly formed hydrous MnO2

To understand the water purification mechanism of potassium permanganate as a coagulation-aid during the preoxidation process, the microtopography of its reductive products, the newly formed hydrous manganese dioxide and the aged hydrous manganese dioxide, was investigated. The morphology of natural organic matter (NOM) adsorbed by the newly formed hydrous manganese dioxide was also compared with that of NOM alone. By using the tapping mode atomic force microscopy (AFM), the observation results show that the newly formed hydrous manganese dioxide possess a perforated sheet (with a thickness of 0–1.75 nm) as well as some spherical particle structures compared with the hydrous manganese dioxide with 2 h aging time, which demonstrated that the newly formed hydrous manganese dioxide had a large surface area and adsorption capacity. When 1 mmol/L newly formed hydrous manganese dioxide was added, the microtopography of NOM molecules shifted from a loosely dispersed pancake shape (with adsorption height of 5–8.5 nm) to a densely dispersed and uniform spherical structure. These results provide a valid proof that it is the perfect adsorption capability of the newly formed hydrous manganese dioxide that might result in the coagulation aid effect of potassium permanganate preoxidation. Translated from Environmental Science, 2006, 27(5): 945–949 [译自: 环境科学]