共查询到19条相似文献,搜索用时 752 毫秒
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浅谈污水厂污泥堆肥化技术 总被引:4,自引:0,他引:4
堆肥化技术是使污水厂污泥达到稳定化和无害化的一种经济而有效的手段。目前常用的污泥堆肥化系统可以划分为:条垛系统,强制通风静态垛系统和发酵槽系统。为了加快微生物对污泥中有机物的降解转化,提高处理能力,可对以下因素进行控制:C/N比,含水率,空隙率,温度和通风。在判定污泥堆肥腐熟上,建议采用与氮有关的参数如氨氮、亚硝酸和硝酸盐氮等作为污泥堆肥一般性熟化判定指标。 相似文献
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文章对污泥浓缩、污泥调理、污泥脱水技术发展现状进行了介绍,着重对主流污泥脱水技术及设备选型进行了分析比较,强调了污泥处理技术具有各自的适用范围.此外还介绍了超声波技术在污泥处理领域应用的前景. 相似文献
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市政污泥与生活垃圾掺烧工艺探讨 总被引:1,自引:0,他引:1
本文概括介绍了国内市政污泥处理处置的现状和目前不同类型的市政污泥处理处置技术,根据国外经验和国内情况做了市政污泥与生活垃圾掺烧的探讨,并总结了通过掺烧试验进行的工程应用实践。 相似文献
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文章简述了法国污泥处理处置的概况,介绍了湿式氧化法在法国污泥处置的初步应用,包括污泥处理的工艺流程、处理结果及湿式氧化技术的优缺点。指出我国应多途径探索经济高效的污泥处置技术,促进污泥资源化发展。 相似文献
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Composting and compost application in China 总被引:5,自引:0,他引:5
The current situation of municipal solid waste (MSW) and sewage sludge production (in terms of volume as well as composition) in China is introduced. Composting and compost application in China are reviewed. In China, the production of municipal solid waste and sewage sludge is changing rapidly along with economic development. Composting is mainly applied for treating MSW, about 20% of the total amount of MSW being disposed. MSW composting is mainly co-composted with night soil or sewage sludge. Compost is used in agriculture, forestry and horticulture. Compost application is the key factor influencing the composting development in China. To promote composting and compost application in China, a state-wide survey on the production, composition and physical and chemical properties of MSW and sewage sludge should be carried out. More effort should be made to develop low cost and high efficient composting technologies according to China's conditions. The environmental impact of compost application should also be given more attention. 相似文献
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The management of dewatered wastewater sludge is a major issue worldwide. Sludge disposal to landfills is not sustainable and thus alternative treatment techniques are being sought. The objective of this work was to determine optimal mixing ratios of dewatered sludge with other organic amendments in order to maximize the degradability of the mixtures during composting. This objective was achieved using mixture experimental design principles. An additional objective was to study the impact of the initial C/N ratio and moisture contents on the co-composting process of dewatered sludge. The composting process was monitored through measurements of O(2) uptake rates, CO(2) evolution, temperature profile and solids reduction. Eight (8) runs were performed in 100 L insulated air-tight bioreactors under a dynamic air flow regime. The initial mixtures were prepared using dewatered wastewater sludge, mixed paper wastes, food wastes, tree branches and sawdust at various initial C/N ratios and moisture contents. According to empirical modeling, mixtures of sludge and food waste mixtures at 1:1 ratio (ww, wet weight) maximize degradability. Structural amendments should be maintained below 30% to reach thermophilic temperatures. The initial C/N ratio and initial moisture content of the mixture were not found to influence the decomposition process. The bio C/bio N ratio started from around 10, for all runs, decreased during the middle of the process and increased to up to 20 at the end of the process. The solid carbon reduction of the mixtures without the branches ranged from 28% to 62%, whilst solid N reductions ranged from 30% to 63%. Respiratory quotients had a decreasing trend throughout the composting process. 相似文献
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赵兴华 《中国环境管理干部学院学报》2007,17(4):48-50
城市污泥既是污染物又是一种资源,污泥的处理、处置与资源化利用相结合才是其最好的出路。概述了堆肥、碱性稳定化、热干化、焚烧等几种主要的污泥处理和利用方案,并简述了在污泥利用方案选择时需考虑的因素。 相似文献
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介绍了我国污泥堆肥(生物干化)项目臭气治理现状,指出除臭问题是制约污泥堆肥技术推广应用的关键。对比各种除臭技术,分析了污泥堆肥臭气成分和除臭机理,得出结论:化学生物组合除臭工艺与植物液除臭工艺相结合是适合污泥堆肥项目的选择。最后介绍了除臭系统设计选型的主要参数,指出在污泥处理工艺设计中考虑除臭系统可节省投资和运行成本。 相似文献
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It has long been known that heavy metals, when in high enough concentration, have the potential to be both phytotoxic and zootoxic. Heavy metals are frequently found as contaminants in green waste. Any such waste that is subsequently segregated for composting theoretically has the potential to retain that possible contamination. To date, there have been a limited number of publications addressing this issue. Most reports have concentrated on the types of heavy metals found in compost and their acceptable levels, rather than the fate of heavy metal contaminants throughout the composting process. This investigation was aimed to identify the fate of cadmium (Cd), copper (Cu), chromium (Cr), lead (Pb) and zinc (Zn) concentrations throughout a fourteen week composting cycle. The results of this study showed a general increase in the removal of Pb, Cu, Cr, and to a much smaller extent Zn, manifested by a decrease in their overall concentrations within the solid fraction of the final product, by 93, 49, 43, and 20 percent respectively. By contrast, there was no decrease in the overall concentration of Cd. 相似文献
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Alessandra DiGiacomo David W.-L. Wu Peter Lenkic Bud Fraser Jiaying Zhao Alan Kingstone 《Journal of Environmental Planning and Management》2018,61(2):309-331
Increasing volumes of solid waste, implicated in environmental pollution and health problems, are central to the current environmental crisis. In two randomized field experiments, we demonstrate that convenience dramatically boosts recycling and composting rates in multi-family dwellings and university residences. When compost bins were placed on each floor in a multi-family residence, instead of on the ground floor, composting rates increased by 70%, diverting 27 kilograms of compost from the landfill per unit per year. When recycling stations were placed just meters from suites in student residences, instead of in the basement, recycling increased by 147% (container), and 137% (paper), and composting increased by 139%, diverting 23, 22, and 14 kilograms of containers, paper, and compost, respectively, from the landfill per person per year. Simply making recycling and composting convenient can significantly increase waste diversion, and as such this single intervention has important implications for waste management and environmental policy. 相似文献
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Currently there is widespread interest on the part of local Governments in incorporating municipal solid waste (MSW) composting into their integrated solid waste management systems. However, there is little information on the costs of MSW composting and how those costs compare with the costs of alternative forms of waste disposal (especially traditional land disposal). This article begins to fill this information gap by reporting the results of a survey of 19 MSW composting facilities around the United States. Results indicate that MSW composting generally costs around $50 per ton, and that very few facilities receive any revenues from the sale of compost to offset operating costs. Additional economic analysis indicates that, at present, MSW composting cannot be justified on financial grounds in most parts of the US, but may be competitive with land disposal where the cost of landfilling is high (such as the north-east).1998 Academic Press 相似文献