Papers by Keyword: Rainwater

Abstract: In view of the dynamic development of electrical and electronic equipment and the reduction of its lifetime, the share of electronic equipment that has become waste has risen. In proportion to this situation, there is a constant improvement in separating industrial methods aimed at removing hazardous components of electrical waste (PCBs containing condensers, mercury switches or asbestos insulation). Another commodity, and economically more interesting, is the obtaining of the utility component of the waste iron and non-ferrous metals. After the separation of the interesting components what remains is a heterogeneous mixture of plastic pulp, which is usually landfilled or incinerated in the waste incinerator. This leads to the loss of valuable material, which could be further exploited. The paper deals with the issue of the disposal of plastics from electrical waste and its subsequent use as plastic pulp, which can be used to fill the rainwater detention reservoir.

Abstract: This paper presents an analysis of the rainwater flow on the final cover slopes of an urban landfill so as to ensure the drainage of infiltrate water through the drainage layer applied across the geomembrane of cover layer, with a runoff coefficient as low as possible. It is presented a calculation model for the transmissivity of the drainage layer depending on the thickness and on its hydraulic characteristics and also on the topsoil layer applied to the surface, as well as depending on the coating slope length. This calculation is made for both a side with a single slope (tilt) as well as for sides with two slopes. Also it is presented a mathematical model for the hydraulic calculation of surface water drainage ditches drained through the drainage layers, but also through the surface runoff, in order to establish the optimal drainage section.

Abstract: This paper focuses on safety rainwater runoff from inverted green roof construction. Water flowing between XPS insulation panels has negative impact on thermal characteristics of whole roof. This water deteriorates thermal efficiency of insulation and also microlayers which hinder diffusion are created. The negative effect is especially manifested in passive houses with inverted roof assemblies. The aim of the paper is to describe the negative effect of under-flowing water, to mention various types of green roof usage and the final assessment.

Abstract: The Mann-Keddall formula was used for precipitation distribution and variation in Xianing Port of Changsha. The results shown that most rain fell between March and August,the rainfall in these month was about 70% of the annual rainfall. Monthly precipitation between March and July was greater than annual precipitation. Annual precipitation was 1413.5mm, and had the characteristics of uneven distribution and large fluctuation. The potential volume of rainwater for utilization was 1.82×10¹²m³.

Abstract: Existing systems that provide an alternative water supply such as a sewage reuse system (SRS) or a rainwater harvesting system (RWHS) tend to experience a slight loss of efficiency through the separate use of their component systems. A smart system has been introduced that combines the stable water quality of an RWHS and the stable water quantity of an SRS for use in sports complexes in Korea, and selected monitoring results are presented here in terms of the quantity of water used. The system monitors the operating conditions and provides measurement data. It is designed to be remotely operated at each facility in which it is installed. Ninety-eight percent of the treated sewage was used for lawn watering and maintenance of wetlands. The rainwater collection efficiency was higher in summer than winter in the rainwater utilization system. The amount of water produced from the sewage reuse system can be reduced during summer and increased during winter when less rainfall is experienced. A system that combines rainwater and treated sewage is expected to reduce the cost and energy use for treating wastewater.

Abstract: This paper analyses the suitable seasonal reduction coefficient and rainwater runoff initial abandon coefficient in Zhangjiakou city, which is selected as a study area and is in upstream of Yongding River. And it analyses the achieve volume of rainwater-resources utilization. Through the analysis on the regional precipitation in study area, it obtained the suitable calculation formulas for the rainwater-storage-pool volume per year in rainwater collecting-reusing system of this area .

Abstract: The objective of this study is to improve water quality resulting from rainwater purification treatment and to utilize reclaimed water purification system and high-class treatment purification system. This can be done by developing a purification treatment technique through resolution of discharged ozone problems by circulation-type of ozone treatment method with the use of a high-efficiency air-cooled cylindrical ozone generator. While the final removal rate of BOD showed the highest rate of 96% for 12g without showing a great difference for the ozone injection amount of 9g and 12g, the final removal rate of COD upon treating for 12 minutes showed 73%, 66%, 93% and 96% for 3g, 6g, 9g and 12g, respectively, exhibiting similar treatment results to that of BOD. The removal of TSS and VSS due to ozone treatment was indicated not to have occurred. Also, upon passage of the magnetized water device, the removal rate of colon bacterium and general bacteria was shown to be about 35%, while a high removal rate exceeding 70% was indicated during the initial 3 minutes. Upon final treatment for 12 minutes, sterilization power above 99% was exhibited. Upon treatment using the magnetized water device and the OH^- radical generator, not only dissolved suspended materials but also excellent sterilization power appeared to be identifiable.

Abstract: This paper introduced a kind of rainwater biofiltration processing technology being researched and applied in Australia. It summarized FAWB researchers’ major research and progress on the system configuration, packaging selection, plant selection and purification effect of this technology. And the advantages were presented in removing the suspended matters, heavy metal ions and nutritional pollutants in rainwater biofiltration system, as well as in regarding to the characteristics of effectively stored the rainwater for recycling in system configuration. The paper also put forward suggestions to the technical improvement for our country’s rainwater treatment system and structure design for reference.

Abstract: The concept of reusing wastewater and rainwater in buildings has recently become more important. There are countries where the use of greywater in some buildings has already been made mandatory (e.g. in Japan for toilet flushing). Such measures are gradually being introduced in the EU, where water recycling projects exist for office buildings and hotels. The Czech Republic still lacks experience and a design background in this area. The article is based on TAČR project No. TA01020311, titled “The use of grey and rain water in buildings”, and summarizes basic information about the quality of greywater, and methods of treating it and recovering its heat.

Abstract: In this paper, a new semi- automatic method for finding best locations for rain-water drainage lines is developed. The developed method is based on a heuristic greedy algorithm and relies on a digital terrain model (DTM) that can be generated from digitized contour lines or from new remote sensing technologies, such as the airborne laser scanning LiDAR (Light Detection and Ranging) systems. The developed algorithm in this paper uses heuristics and a neighborhood search to find the best locations for rain-water drainage lines between two defined points by minimizing the objective function value by considering a set of constraints, including constrained elevation values and downward slope. The developed algorithm is implemented in a computerized model named (CPline_Route) developed in Microsoft Windows Visual C++6 and was equipped with Graphical User Interface (GUI) to friendly enable users enter their desired parameters and specify an approximate initial line interactively. The performance of the developed computerized tool was tested by restricting a search around a contour line with constrained elevation values, and the result obtained demonstrated that the developed algorithm is effective. It noteworthy that optimal solution cannot be guarantee using greedy heuristic developed in this study. It can be concluded that the developed method is feasible for planning new rain-water drainage lines for new residential areas in developing countries where heavy rains are frequent, and potentially to be useful for planning new pipelines.