Purification and reclamation of wastewater by an integrated biological pond system

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用UDS试验检测黄浦江水质致遗传毒性

本文运用UDS试验来检测黄浦江水质致遗传毒性,结果表明,试验条件是可行的。UDS试验从DNA修复合成的角度来反映受试物的致遗传毒性作用,可作为水质评价的方法之一。     

光合细菌与酵母跨界融合(杂合)子发酵味精废水研究

光合细菌球形红假单胞菌（Ｒｈｏｄｏｐｓｅｕｄｏｍｏｎａｓ ｓｐｈａｅｒｏｉｄｅｓ）酿酒酵母（Ｓａｃｃｈａｒｏｍｙｃｅｓ ｃｅｒｅｖｉｓｉａｅ）细胞分别经溶菌酶和蜗牛酶脱壁形成原生质体，在聚乙二醇（ＰＥＧ）和Ｃａ＾２＋诱导下实现了真核与原核细胞的超远缘杂交，经抗菌素培养基初步鉴定，融合产物能同时在含有链霉素和制霉菌素的培养基中生长，而双亲细胞只能在含有单一抗菌素的培养基中生长，经初筛与得获得高絮弟性     

对今后我国海洋环境保护工作的几点设想

本文比较全面地阐述了近年来我国海洋环境保护工作所取得的主要成就，并针对未来沿海经济的迅速发展将给海洋环境带来的压力，探讨深入开展海洋环境保护工作。     

催化剂含氨氮污水治理技术的探讨

对高浓度氨氮污水的处理技术进行比较，结合兰州石化公司催化剂污水排放的实际和目前开展的治理研究，提出了综合治理催化剂含氨氮污水的设想。     

沉淀—树脂吸附法处理对氨基偶氮苯盐酸盐生产废水的研究

对氨基偶氮苯盐酸盐（ＰＡＢＳ）是生产染料的重要中间体。在ＰＡＢＳ生产过程中，排放出高浓度（ＣＯＤ４万～８万ｍｇ／Ｌ）、高色度（４万～８万）、高毒性（含苯胺和对氨基偶氮苯）和高氯（Ｃｌ－４万～１０万ｍｇ／Ｌ）的废水。利用中和沉淀—大孔吸附树脂吸附法进行了处理工艺的小试研究。结果表明，废水色度去除率达到９９９％，降到２０以下；出水中基本不含对氨基偶氮苯（ＰＡＢ）；出水中苯胺的浓度降到３ｍｇ／Ｌ。ＧＣ／ＭＳ分析的结果表明，乙醇脱附液中苯胺是最主要的有机物，所以利用该工艺能实现苯胺的回收。     

我国污水资源化存在问题及其对策

我国是缺水国家,水资源短缺严重制约着发展前景,水污染问题又使缺水状况更加突出.实施污水资源化战略可提高水的利用率,缓解部分水资源紧张问题.     

宜宾市三江水体粪大肠菌群污染现状调查

粪大肠茵群指数(FC)是综合评价城市污水，尤其是生活污水的一个重要指标。本文对宜宾市“三江”水体的FC进行了监测，结果表明“三江”受到了生活污水的污染。丰水期的FC指数超出我国地表水Ⅲ类标准的10倍。     

Mechanical and Barrier Properties of Biodegradable Films Made from Chitosan and Poly (Lactic Acid) Blends

Biodegradable film blends of chitosan with poly(lactic acid) (PLA) were prepared by solution mixing and film casting. The main goal of these blends is to improve the water vapor barrier of chitosan by blending it with a hydrophobic biodegradable polymer from renewable resources. Mechanical properties of obtained films were assessed by tensile test. Thermal properties, water barrier properties, and water sensitivity were studied by differential scanning calorimeter analysis, water vapor permeability measurements, and surface-angle contact tests, respectively. The incorporation of PLA to chitosan improved the water barrier properties and decreased the water sensitivity of chitosan film. However, the tensile strength and elastic modulus of chitosan decreased with the addition of PLA. Mechanical and thermal properties revealed that chitosan and PLA blends are incompatible, consistent with the results of Fourier transform infrared (FTIR) analysis that showed the absence of specific interaction between chitosan and PLA.     

Green roof stormwater retention: effects of roof surface, slope, and media depth

Urban areas generate considerably more stormwater runoff than natural areas of the same size due to a greater percentage of impervious surfaces that impede water infiltration. Roof surfaces account for a large portion of this impervious cover. Establishing vegetation on rooftops, known as green roofs, is one method of recovering lost green space that can aid in mitigating stormwater runoff. Two studies were performed using several roof platforms to quantify the effects of various treatments on stormwater retention. The first study used three different roof surface treatments to quantify differences in stormwater retention of a standard commercial roof with gravel ballast, an extensive green roof system without vegetation, and a typical extensive green roof with vegetation. Overall, mean percent rainfall retention ranged from 48.7% (gravel) to 82.8% (vegetated). The second study tested the influence of roof slope (2 and 6.5%) and green roof media depth (2.5, 4.0, and 6.0 cm) on stormwater retention. For all combined rain events, platforms at 2% slope with a 4-cm media depth had the greatest mean retention, 87%, although the difference from the other treatments was minimal. The combination of reduced slope and deeper media clearly reduced the total quantity of runoff. For both studies, vegetated green roof systems not only reduced the amount of stormwater runoff, they also extended its duration over a period of time beyond the actual rain event.