共查询到20条相似文献,搜索用时 46 毫秒
1.
火力发电厂全厂废水零排放 总被引:11,自引:3,他引:11
讨论了火电厂废水类型、排放标准及治理与回用原则,研究了全厂废水零排放的准确含义、约束条件、影响因素、主要内容以及国内外应用示例,为实施火电厂全厂废水零排放提供参考。 相似文献
2.
3.
4.
1968年以来,田纳西流域管理局(TVA)一直在研究燃煤电厂排放的废水特性。研究内容包括锅炉化学清洗废水、煤堆排水、灰场浸出水、石灰和石灰石二氧化硫洗涤塔排水、冷却塔排污水、氯处理的直流冷却水和灰场排水等的特性。本文介绍灰场排水特性以及冲灰水和火电厂其它废水的几种再利用方法。煤灰用水力冲灰方式输送到灰场处置, 相似文献
5.
中美两国火电厂SO2排放要求与控制措施比较 总被引:4,自引:0,他引:4
系统地比较了中美两国火电厂的SO2排状况、标准及控制要求,火电厂控制SO2排放的对策与措施;介绍了了火电厂SO2排放对大气环境及酸雨的不同影响;对我国火电厂SO2排放标准的修改及电厂SO2的排放控制提出建议。 相似文献
6.
介绍了河北马头电厂废水处理工艺系统流程、设计及系统调试运行指标。处理后的电厂废水作为循环冷却水的补水,减少了新鲜水用量和污水排放量,对北方地区厂区废水回收利用具有借鉴意义,在火电厂废水资源利用方面有很好的应用前景。 相似文献
7.
结合黑龙江省直属火电厂“八五”以来的用水排水基本情况,分析了火电厂李水及废水治理的具体措施,提出了符合黑龙江省实际的节水,治水思路。 相似文献
8.
锅炉酸洗废水具有排放量大、污染物浓度高和处理难度极大的特点。为实现酸洗废水处理后复用,不外排,分析了河源电厂2×600 MW超超临界机组酸洗废水成份,进行了小型模拟处理试验,探索了降低废水中金属离子含量、COD和浊度的方法。根据试验结果,采用稀释、pH调整、曝气、絮凝、沉淀及机械过滤的方法对锅炉酸洗废水进行处理,处理后的清水作为脱硫系统的工艺补充水。脱硫系统排出的废水采用蒸发结晶工艺进行处理,处理后的冷凝水作为冷却塔补充水回收利用,最终实现零排放,可为火电厂酸洗废水的处理利用提供参考。 相似文献
9.
广州某油品有限公司主要从事重油降粘处理、油品储存及油品贸易等业务。该公司生产过程所排放的废水以及地面冲洗水 ,含有大量油类、酚类、硫化物等。以前 ,该公司对这些废水采用隔油池隔油处理后直接排放珠江 ,对珠江造成了一定的污染。根据政府及环保部门的要求 ,公司对原废水处理工艺进行了改造 ,改造后的废水处理装置运行结果表明 ,废水处理效果良好 ,出水水质达到《广州市污水排放标准》DB 4 437— 90一级新扩改标准。1 设计参数该厂主要有 3股废水 ,即硫氨废水 (占废水总量的 4 0 % )、含油废水 (占废水总量的 5 0 % )和冲洗废水 (… 相似文献
10.
11.
Lake sediment cores were analyzedto study the history of mercury (Hg) pollution andparticularly to determine whether recent sedimentconcentrations have declined in response todeclining atmospheric deposition of Hg. Sedimentcores from 6 forest lakes distributed fromsouthern to northern Sweden and 3 northernmountain lakes were analyzed for Hg using CVAAS. A400 cm sediment profile from Måkevatten insouthwest Sweden indicates that the onset of Hgpollution occurred in the 18th century. Anindisputable increase in Hg concentrationsoccurred concurrent with the appearance ofspheroidal carbonaceous flyash particles (SCP)derived from fossil-fuel combustion, in themid-19th century. There is a strong correlationbetween Hg and SCP concentrations in the sedimentcores (r=0.67 to 0.91), which suggests a strongrelationship between historical Hg pollution andfossil fuel burning. In contrast to sediment corestaken in 1979, maximum Hg concentrations are nowobserved below the sediment surface and declinetowards the sediment surface. This study confirmsthat reductions in atmospheric deposition of Hgover Sweden have resulted in a decreased transferof total Hg to aquatic environments as reflectedby lake sediments, and that lake sediment profilesof Hg concentrations reflect relative trends inthe atmospheric deposition of Hg rather thanpost-depositional diagenetic processes. 相似文献
12.
The deposition patterns of Mn, Fe, Cr, Sb, Zn and As wereinterpreted together with enrichment factor calculations. Samples collected around iron-steel plant had very high concentrations and EF values of Mn, Fe, Cr, Sb and Zn implying that these plants are serious pollution sources in the region. High As concentrations around the settlementareas showed that coal combustion is another important anthropogenic source in the region. 相似文献
13.
《Waste management & research》1990,8(5):379-385
This paper develops a quantitative model which attempts to relate volumetric changes in landfill gas emissions to variations in the surface atmospheric pressure. The model considers gas emissions as the sum of two terms, one constant over a period of weeks, and the other able to vary on a scale of hours. Results from computer simulations are given which indicate that the magnitude of the variable factor is proportional to the rate at which surface pressure is changing, rather than the actual value of the surface pressure. 相似文献
14.
The SO4–S and NO3–N concentrations and pH in bulk precipitation, throughfall, stemflow and soil water for the 1994–2004 period were studied
in pine forests in Latvia (Rucava and Taurene Integrated Monitoring stations). The SO4–S and NO3–N concentrations decreased over the study period, simultaneously with a decrease of acidity in precipitation. The changes
were more evident in the western part of Latvia, probably due to declining long-range air pollution from West Europe. The
trend of decreasing sulphate concentrations and increasing pH in precipitation were not followed by respective changes in
soil water. In the upper soil horizon sulphate ion concentrations and acidity increased in soil water. Over the observation
period, nitrate concentrations also showed an increasing trend in soil water at Rucava and Taurene, but these changes were
not statistically significant. 相似文献
15.
The research concerns the Wielkopolski National Park (West Poland), which suffered a huge human impact in the 1970s and 1980s
owing to the nearby location of an industrial plant. Since then, fundamental technological changes that it introduced into
its production of phosphate fertilizers have radically reduced the amount of pollution emitted. A three-year study (2002–2004)
of fluorides in precipitation in open terrain and under tree crowns showed their concentrations to range from levels below
the detection limit (0.003 mg/l) to 0.560 mg/l. Those registered under tree crowns were several times higher and indicated
substantial dry deposition of fluorides on the trees. The highest values were recorded in 2003, with 43% of samples ranging
from 0.01 to 0.05 mg/l, and with 51% of throughfall ranging from 0.10 to 0.50 mg/l. A strong connection was shown to exist
between fluoride and sulphate concentrations in the precipitation. An analysis was made of the available data on F concentrations
in the air and the dust levels around the factory, but these figures did not show an unequivocal effect on F concentrations
in precipitation. A great similarity was found to occur between the fluoride content in rainwater in the Wielkopolski National
Park and in the centre of the nearby Poznań metropolitan area, which indicates that there are also other F sources besides
the local factory. 相似文献
16.
Michikazu Kojima Aya Yoshida So Sasaki 《Journal of Material Cycles and Waste Management》2009,11(3):263-269
Developing Asian countries have started to apply the principle of extended producer responsibility (EPR) to electronics and
electrical equipment waste (e-waste). This policy approach aims to give electronic appliance manufacturers and importers responsibility
for the collection and recycling of discarded electronic equipment. China and Thailand have drafted regulations on the recycling
of e-waste with common characteristics such as the financial responsibility of producers and subsidies for collection. Although
the proposed system is sensible, taking into account the fact that e-waste is a market-traded commodity, there are two major
difficulties in implementing EPR in developing countries. First, it may be difficult for governments to collect funds from
producers or importers if smuggled, imitation, or small shop-assembled products have a large share in the market. Second,
the system creates incentives for collectors and recyclers to over-report the amount of collected e-waste in order to gain
extra subsidies from the fund. Other policy measures such as the enforcement of pollution control regulations on informal
recyclers, the prevention of smuggling, and the protection of intellectual property rights should accompany EPR policies. 相似文献
17.
Mohee R 《Waste management (New York, N.Y.)》2005,25(6):575-581
This study was initiated to characterize solid and liquid wastes generated in healthcare institutions and to provide a framework for the safe management of these wastes. The project was carried at three major medical institutions, namely, the Jeetoo Hospital, the Sir Seewoosagur Ramgoolam National (SSRN) Hospital and the Clinic Mauricienne. A waste audit carried out at these sites revealed that approximately 10% of solid wastes was hazardous in nature, consisting mainly of infectious, pathological and chemical wastes. The average amount of hazardous wastes per patient per day was found to be 0.072 kg at Jeetoo hospital, 0.091 kg at SSRN hospital and 0.179 kg at the clinic. The amount of hazardous wastes generated as a function of the number of occupied beds was found to follow a relationship of type y=0.0006x-0.19, where y was the amount of hazardous wastes generated per bed per day and x was the number of occupied beds. The waste quantifying process also revealed that at SSRN Hospital, 0.654 m(3) of water was being consumed per patient per day and the amount of wastewater produced was 500 m(3)/day. Further analysis revealed that the wastewater was polluting with chemical oxygen demand (COD), biological oxygen demand (BOD(5)), total suspended solids (TSS) and coliform content well above permissible limits. 相似文献
18.
The objective of this paper is to estimate the future projection of computer waste in India and to subsequently analyze their flow at the end of their useful phase. For this purpose, the study utilizes the logistic model-based approach proposed by Yang and Williams to forecast future trends in computer waste. The model estimates future projection of computer penetration rate utilizing their first lifespan distribution and historical sales data. A bounding analysis on the future carrying capacity was simulated using the three parameter logistic curve. The observed obsolete generation quantities from the extrapolated penetration rates are then used to model the disposal phase. The results of the bounding analysis indicate that in the year 2020, around 41–152 million units of computers will become obsolete. The obsolete computer generation quantities are then used to estimate the End-of-Life outflows by utilizing a time-series multiple lifespan model. Even a conservative estimate of the future recycling capacity of PCs will reach upwards of 30 million units during 2025. Apparently, more than 150 million units could be potentially recycled in the upper bound case. However, considering significant future investment in the e-waste recycling sector from all stakeholders in India, we propose a logistic growth in the recycling rate and estimate the requirement of recycling capacity between 60 and 400 million units for the lower and upper bound case during 2025. Finally, we compare the future obsolete PC generation amount of the US and India. 相似文献
19.
20.
Sumikura Yuichiro Katsumi Takeshi 《Journal of Material Cycles and Waste Management》2022,24(4):1216-1227
Journal of Material Cycles and Waste Management - The status of material reuse and recycling in Japan is reviewed with an emphasis on the efforts by the national government. First, the national... 相似文献