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41.
不同浓度养殖废水对青萍生长能力的影响 总被引:2,自引:0,他引:2
为了探讨废水浓度对青萍(Lemna minor)净化能力、生物质和能量积累能力的影响,以猪场养殖废水为供试废水,分析了在不同废水浓度下青萍对废水中总氮(TN)、氨氮和总磷(TP)的净化能力,青萍的生长情况,以及青萍中碳(C)、氮(N)、磷(P)元素含量和热值的变化情况。研究表明,青萍在1%浓度的废水中表现出最高的污染物净化能力。虽然青萍的C、N、P含量和热值均随废水浓度的增加而增加,但是由于相对增长率以1%的废水中生长的青萍最高,青萍的最高生产力、C和能量的固定能力均出现在1%废水浓度培养的青萍中,其次是5%废水浓度培养的青萍。多项式回归分析表明,可以使青萍获得最大C和能量固定能力的废水浓度为3.4%,对应的氨氮浓度为26 mg/L,TP浓度为3.4 mg/L。研究结果为进一步优化高生物质生产、高污染物去除率的养殖废水-浮萍培养体系提供了一定的基础。 相似文献
42.
Increased risk of preterm delivery among people living near the three oil refineries in Taiwan 总被引:1,自引:0,他引:1
The petrochemical and petroleum industries are two of the main sources of industrial air pollution in Taiwan. Data used in this study concern outdoor air pollution and the health of individuals living in communities in close proximity to oil refinery plants. The prevalence of delivery of preterm birth infants was significantly higher in mothers living near the oil refinery plants than in control mothers in Taiwan. After controlling for several possible confounders (including maternal age, season, marital status, maternal education, and infant sex), the adjusted odds ratio was 1.14 (95% CI=1.01-1.28) for delivery of preterm infants for mothers living near oil refinery plants. These data provide further support for the hypothesis that air pollution can affect the outcome of pregnancies. 相似文献
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Most of the oyster mariculture beds in Taiwan are in areas located along the west of the island. One of these areas is the Charting coast, where green oysters were found in 1986. During this incident, which became internationally notorious, mass mortality occurred in the Charting oyster beds. After this discovery, measures were taken by the authorities to counter pollution which lead to the problem. The effectiveness of these pollution control actions was evaluated in this study. Two water column indicators, particulate and sediment, and oysters were sampled and analyzed for metals (Cu, Zn, Pb, Ni) in Charting and its neighboring areas, Kuen-Shen Lake and Shin-Da Harbor, and the control area/station, Dah-Pen Wan. The current study shows that copper and zinc concentrations in both oysters and particulates significantly decreased in the Charting area, compared with concentrations found during the period of the green oyster incident. Six years after the incident, the copper concentration in oysters had fallen from a high of 4400 μg/g dry weight to an average of 300±69 μg/g dry weight, figures similar to the copper concentration in 1982. The pollution control actions taken after the incident are believed to be the cause of this recovery of the coastal environment. Nevertheless, Charting still produced oysters with the highest copper and zinc concentrations among the areas investigated. Further measures currently being taken by the government, including removing the sediment of some portions of Erhjin Chi, should be able to bring the oyster copper concentrations down to the levels similar to those observed in the neighboring area, (average concentration below 200 μg/g dry weight or all time maximum concentration below 500 μg/g dry weight). 相似文献
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目的通过自主研发的大气环境腐蚀参数自动检测仪,监测并积累变电站大气腐蚀数据,判断大气腐蚀性,为变电站选择腐蚀与防护手段,提供数据支持和依据。方法依据变电站大气腐蚀研究的最新理论成果,参考最新国家标准,将影响变电站腐蚀因素的各参数整合,选择国内外最先进的传感器,根据实际工况要求,研制了一台基于变电站环境的大气腐蚀参数检测仪。结果仪器的各项技术指标均达到设计要求,能够满足现场要求,可以根据变电站设备材质要求,定制腐蚀传感器。结论通过在国家大气腐蚀网站(沈阳站)、浙江电力公司所属变电站的测试,研制的大气环境腐蚀参数自动检测仪能够实时采集影响腐蚀的各影响因子的参数值,满足未来腐蚀监测仪器、装备多参数、智能化的要求。 相似文献
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采用化学共沉淀法制备了磁性Fen+@GO(MFGO)纳米复合材料,并将其用于非均相Fenton催化氧化亚甲基蓝(MB).扫描电镜、透射电镜和光电子能谱分析表明,催化活性粒子(Fen+/铁氧化物)成功负载在GO表面.实验研究了pH值、H2O2初始浓度、催化剂投加量等因素对MB降解效果的影响.结果表明,H2O2、MFGO和H2O2+MFGO体系在反应120min后,MB降解率分别达到7.83%、25.58%和99.19%;在优化条件为H2O2浓度0.79mol/L、MFGO用量0.75g/L、pH值8时,MB降解率可达99.90%;在pH值为3~11范围内,MB降解率均在99%以上;MFGO经过6次重复使用后对MB的降解率仍可达到95.08%,是一种pH值响应宽、可磁分离回收的新型非均相催化剂. 相似文献
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This research utilized the Ames test to determine the mutagenicity of water treated by advanced processes, including ozonation and granular activated carbon (GAC). Raw water samples for this research included those obtained from the Pan Hsin waterworks as well as samples containing humic acids. Treated samples were collected from the pilot‐scale advanced treatment plant. The Ames test was used to measure the mutagenicity of the water after each treatment process. For the Pan Hsin raw water samples treated with ozone or GAC, it was indicated that, regardless of whether samples were preozonated or not, they all showed a mutagenic potency less than 2 once the S9 enzyme was added. This level of mutagenicity is insignificant. The prepared humic acid samples, on the other hand, demonstrated a significant reduction in mutagenicity after the pre‐ozonation process, indicating that preozonation can lower the degree of mutagenicity. Furthermore, the mutagenicity of the prepared humic acid samples gradually decreased after the advanced treatment process. However, when chlorine was added later to these samples, the mutagenicity increased again. This research shows that the use of O3/GAC processes to treat water can successfully lower mutagenicity, indicating a great potential for applications in the treatment of drinking water. 相似文献