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991.
为了了解苏州工业园区夜间光环境现状,本文通过对苏州工业园区夜间环境照度、亮度进行测量,对夜间广告与标志灯数量进行调查和统计分析,探讨了苏州工业园区的主要光环境问题,并提出光环境治理的对策和建议。 相似文献
992.
Guohua Dai Xinhui Liu Gang Liang Xu Han Liu Shi Dengmiao Cheng Wenwen Gong 《环境科学学报(英文版)》2011,23(10):1640-1649
Persistent organochlorine compounds, including hexachlorocyclohexanes (HCHs), dichlorodiphenyltrichloroethanes (DDTs) and polychlorinated biphenyls (PCBs) were analyzed in surface water and sediments from Baiyangdian Lake, North China. Total concentrations of HCHs, DDTs and PCBs in surface water were in the range of 3.13-10.60, 4.05-20.59 and 19.46-131.62 ng/L, respectively, and total concentrations of HCHs, DDTs and PCBs in sediments were 1.75-5.70, 0.91-6.48 and 5.96-29.61 ng/g dry weight, respectively. Among the groups of HCHs (sum of α-HCH, β-HCH, γ-HCH and δ-HCH) and DDTs (sum of DDT, DDD and DDE), the predominance of β-HCH, DDE and DDD in water and sediment samples was clearly observed. This observation suggested that β-HCH was resistant to biodegradation and the DDTs had been transformed to its metabolites, DDE and DDD. For PCBs, penta-, hexa- and hepta-chlorinated congeners were the most abundant compounds in the both phases. Furthermore, the partitioning of chlorinated compounds between sediment and water was investigated to understand their transport and fates in aquatic ecosystems. The results indicated that average logs of organic carbon-normalized sediment-water partition coefficients (logKoc') for OCPs varied between 3.20 and 5.53, and for PCBs, logKoc' values ranged from 3.19 to 5.57. The observed logKoc' was lower than their equilibrium logKoc predicted from linear model, which may be attributed to the solubility enhancement effect of colloidal matter in water phase and the disequilibrium between sediment and water. 相似文献
993.
街道地表物的累积与污染特征:以成都市为例 总被引:16,自引:1,他引:16
本文研究了成都市区74km~2范围内地表物的累积规律和污染特征.结果表明,街道地表物累积受土地用途影响;地表有机物受人类活动的影响;重金属受城市交通的影响.粒径分布研究发现街道地表物小于360μm的微粒占70%,且各种污染物主要吸附于细小的微粒上.使用地表污染物边坎累积模型计算了街道地表物和各种污染物的累积量.成都市区每天累积地表物达111吨,BOD,达78kg,COD达411kg,克氏氮6kg和总磷2kg. 相似文献
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Structure properties of flocs (size, fractal dimension (Df), etc.) have a high impact on coagulation efficiency. In this work, the influences of three different additives (ferric salt (Fe), phosphate (P), and citric acid (CA)) on coagulation process/efficiency were investigated. Results showed that a small amount of extra Fe can facilitate the growth of Al flocs by providing more ‘active sites’. Although zeta potential and Df showed a limited change, the average floc size increased apparently and the increment was more obvious when Fe was added after the formation of the flocs. In contrast, P addition during the rapid mixing period will decrease the final average floc size, while the influence is less significant when P was added after the growth of the flocs. In terms of CA, a more striking negative effect on the growth ability of the flocs was observed compared to P. The strong complexing/coordination interactions between CA and aluminum hydroxide is the main reason behind the influence. CA also significantly decreased the Df value of the flocs compared to P, and Df showed a comparatively higher decrease when P or CA was added during the rapid mixing stage compared to the addition after the flocs formation. These results indicated that the addition of CA or P during the rapid mixing stage ‘inactivated’ or occupied more ‘active sites’ on the preliminarily formed Al NPs during the hydrolysis process, and therefore presented stronger impact on the morphology/size of the formed flocs. 相似文献
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污泥焚烧被认为是有具有良好发展前景的污泥减量化和资源化技术,已成为目前污泥处置的主流方式。印染废水处理设施和集中式生活污水处理厂产生的污泥环境风险属中度,推荐采用焚烧的处置方式。通过对燃煤热电厂掺烧污泥飞灰属性鉴别采样方法的分析和筛选,依据GB 5085.1—2007至GB 5085.6—2007等相关规范对飞灰进行鉴别,认为燃煤锅炉掺烧少量印染污泥和生活污泥后,其飞灰不具备危险固废特性,可按照一般固废进行综合利用。焚烧产生的飞灰特性取决于掺烧污泥的属性,要求污泥焚烧项目飞灰综合利用前应按要求开展危险废物鉴别。 相似文献
999.
Haotian Hao Yili Wang Baoyou Shi Kun Han Yuan Zhuang Yan Kong Xin Huang 《环境科学学报(英文版)》2018,30(11):107-116
Dye wastewater containing heavy metal ions is a common industrial effluent with complex physicochemical properties.The treatment of metal–dye binary wastewater is difficult.In this work,a novel in-situ ferrite process(IFP) was applied to treat Methylene Blue(MB)–Cu(II)binary wastewater,and the operational parameters were optimized for MB removal.Results showed that the optimum operating conditions were OH/M of 1.72,Cu~(2+)/Fe~(2+)ratio of 1/2.5,reaction time of 90 min,aeration intensity of 320 mL/min,and reaction temperature of40°C.Moreover,the presence of Ca~(2+)and Mg~(2+)moderately influenced the MB removal.Physical characterization results indicated that the precipitates yielded in IFP presented high surface area(232.50 m2/g) and a multi-porous structure.Based on the Langmuir model,the maximum adsorption capacity toward MB was 347.82 mg/g for the precipitates produced in IFP,which outperformed most other adsorbents.Furthermore,IFP rapidly sequestered MB with removal efficiency 5 to 10 times greater than that by general ferrite adsorption,which suggested a strong enhancement of MB removal by IFP.The MB removal process by IFP showed two different high removal stages,each with a corresponding removal mechanism.In the first brief stage(5 min),the initial high MB removal(~95%)was achieved by predominantly electrostatic interactions.Then the sweep effect and encapsulation were dominant in the second longer stage. 相似文献
1000.