城市污泥的处理处置与资源化利用

城市污泥是城市污水处理不可避免的产物,如何使污泥的处置与环境保护之间达到一个良好的平衡是当前面临的重大课题。本文主要论述了城市污泥的特性,处理和处置方法,并介绍了一些目前国内外污泥资源化利用的技术。     

污泥资源化利用的研究进展

本文分析了传统污泥处置方式存在的一些问题,介绍了污泥资源化利用在农业、材料、能源等方面的应用,同时探讨了我国污泥处置的发展趋势。     

城市污泥处理与资源化技术研究进展

随着经济的快速增长,作为污水处理的副产品,市政污泥的产量大幅提高,污泥处置在城市化进程中不容忽视。本文首先阐述了污泥污染的种类,在此基础上总结了污泥污染的类型。其次,从解决污泥的排放问题和提高城市水污染标准之间的关系等方面分析了污泥的处理和处置现状。最后,总结了污泥处置的方法及污泥资源化处理的类型,为未来污泥处理技术的发展方向提供参考。     

城市污泥资源化处理技术

城市污泥量逐年增加,污泥含有许多有毒有害物质亦含有许多有益成分,如何对其进行合理利用已经成为目前环境方面急需解决的固体废物污染问题.资源化是城市污泥未来发展的主要方向.结合城市污泥的处置现状,着重介绍污泥的资源化利用的新技术.     

城市污泥资源化利用研究现状

介绍了城市污泥性质及常规处理、处置情况,从污泥农林利用、建材化、能源化、制吸附剂、污泥中蛋白质的有效利用及制聚合物复合材料等几方面探讨了国内外污泥资源化利用的现状,阐述了污泥建材化利用能更好地利用污泥中的有机及无机物质,同时更有效地消减污泥中的有毒有害物质,并展望了污泥建材化制品在城镇化不断深入的进程中将具有更广阔的发展空间。     

城市污泥资源化利用途径探讨

污泥对环境有危害,同时污泥也也含有大量的资源,若能正确的利用污泥,不仅能化危害为资源,又保护了环境和自然资源。本文通过比较不同的污泥处置方法,探讨污泥资源化利用方法,希望能为城市污泥处置寻找合适的方法。     

城市污泥资源化利用研究进展

传统的城市污水厂污泥处理方法具有不能有效利用可再用资源、易造成二次环境危害的弊端,提出积极进行污泥资源化研究才是解决我国城市污泥处理处置的有效途径.详细介绍了污泥资源化技术的多样性,它包括:堆肥利用技术、建材化技术、能源化技术、材料化技术、污泥蛋白质利用技术,其中污泥堆肥技术效果显著、适用范围广、成本较低,适合我国小城...     

污泥处理处置与资源化利用途径

污泥是一种具有利用价值的污染物,只要对污泥进行一定手段的处理处置,污泥也能成为一种资源。这对于改善生态环境具有重大的意义,同时还有助于减少对自然资源的消耗,并且在循环利用的过程中可促进城市的可持续发展。本文将对污泥处理处置技术以及资源化利用途径进行探讨。     

城市污泥处理、处置技术概述

本文系统论述了污泥各种处理,处置技术的现状,并指出了各种处理方法的优缺点,在此基础上提出污泥资源化的一些途径,认为污泥资源化将是今后污泥处置的主要方向.     

城市污泥处理与处置技术的现状研究

随我国的污水处理产业得到了快速发展,污水处理能力及处理率增长迅速,带来了污泥产量的迅速增加。城市污泥的处理处置问题已经威胁到人类的生存环境,成为不可忽视环境问题。文章在主要介绍我国目前对城市污泥处理与处置的常用方法和国内外新的研究进展。     

城市污水厂污泥的处理与综合利用

从卫生填埋、污泥焚烧、土地利用、建材利用、投海等角度论述了当前城市污水厂污泥的处置与综合利用方式,并结合国内实际展望了今后污泥处置利用方向。     

Thermal Gasification: A Feasible Solution for Sewage Sludge Valorisation?

The proliferation of wastewater treatment plants has become essential to ensure the protection of the natural environment. As a consequence, the production of waste by‐products, namely sewage sludge, has increased together with both the unit efficiency levels and with the number of wastewater treatment plants. Since dumping is no longer allowed in the EU, the processes mainly used to treat sewage sludge are agricultural spreading and incineration. However, due to the constant increase in production, it has became essential to find alternative methods of treatment. Considering the chemical composition of sludge, some new thermal processes of treatment have recently been considered by researchers. Thermal gasification is one method that could be of significant interest. Dried sludge composition is sufficiently close to the that of classical biomass (such as wood, rice, etc.) to make sludge treatment in a gasifier feasible. In this paper we discuss how gasification technologies could be transposed to the treatment and valorisation of sludge. Although this process seems attractive, it will also be demonstarted that much experimentation remains to be conducted on a laboratory and pilot scale.     

污水剩余污泥的处理及其合理化利用

介绍了人类生活生产中产生了大量污泥,体积庞大,易腐化发臭,不利运输和处置,剩余污泥的各种无害化及资源化处理技术,指出剩余污泥的处理应走一条保护环境、节约资源和能源的可持续发展的道路。     

城市污泥快速干燥工艺研究进展

热干化是一种城市污泥安全处置的重要途径。塑化是城市污泥热风干燥常见现象,对污泥干燥过程产生重要负面影响。污泥塑化阻碍了内部水分向外迁移,增加污泥干燥时间和干燥能耗。本文概括了近三年天津科技大学机械工程学院课题组在避免或降低污泥"塑化"影响,发展污泥快速干燥工艺的研究进展。新污泥干化工艺包括城市污泥油炸干燥和脉动燃烧雾化干燥。     

Drying Kinetics and Characteristics of Sewage Sludge/Rice Straw Mixture

This study aimed at investigating thin-layer drying characteristics of sludge mixed with different rice straw contents (1, 2, 3, and 5% wb). The experimental results showed that adding 1, 2, and 3% (wb) rice straw to sludge is helpful to improve the drying rate of sludge as the surface area and cracks increase but the drying rate of the sludge mixed with 5% (wb) rice straw decreases with a reduction in thermal conductivity. When the content of rice straw is 2% (wb), the increased amplitude of drying rate is the highest, 14.6, 14.8, 16.0, and 17.6% at 100, 120, 140, and 160°C, respectively. The model proposed by this study showed better prediction compared with the other models and satisfactorily described the drying characteristics of sludge/rice straw mixture as well and is applicable under the given experimental conditions. The values of R², root mean square error (RMSE), and χ² varied from 0.99935 to 0.99992, 0.00295 to 0.00830, and 0.00001 to 0.00007, respectively.     

New Objectives of Sludge Treatment Considering a Safe Sludge Removal

Sewage sludge consists of valuable components such as nutrients as well as harmful substances, e.g. heavy metals. For sludge with a low concentration of pollutants, its utilization in agriculture is the best way of sludge reuse. Carbon recycling is also possible by using disintegration in combination with anaerobic degradation processes. The other important compound in sludge is phosphorus, which is a limited resource on earth. Recycling options for phosphorus are also described in the paper. A safe disposal of the residues can be achieved by using incineration.     

Atomization and Drying Characteristics of Sewage Sludge inside a Helmholtz Pulse Combustor

Sewage sludge of pasty consistency was atomized and dried directly using a high-temperature, highly turbulent gas flow in the tailpipe generated by a Helmholtz gas-fired pulse combustor (PC). Parametric studies were carried out to investigate the effect of drying pipe length and sludge feed tube size on the PC sludge drying process. Experimental results showed that the pulsating gas stream can disperse the sludge into small particles with a narrow size distribution between 0.01 and 4 mm and the granular sludge was dried rapidly due to the increased particle surface area and the high temperature of the drying medium. PC drying of sewage sludge was compared to convective- and microwave-drying processes. The application potential of the PC sludge-drying process is discussed based on the experimental results.     

Experimental Study on Thermal Hydrolysis and Dewatering Characteristics of Mechanically Dewatered Sewage Sludge

After mechanical dewatering, sewage sludge has a moisture content of around 80 wt% and further disposal is required. A new sewage sludge semi-drying (dewatering) process is proposed and verified. It combines thermal hydrolysis and subsequent mechanical dewatering, with less energy consumption than traditional thermal drying. Sludge treated using this new process satisfies further disposal requirements (e.g., landfill or autothermal incineration). In the present study, a high-pressure test reactor was used to study the thermal hydrolysis of dewatered sludge. Thermally hydrolyzed sludge was subsequently dewatered by centrifugal sedimentation or by pressure filtration. The amount of organic compounds returning to the water phase was also measured. According to the results from centrifugal settling tests, the optimal thermal hydrolysis treatment temperature was 180°C. The moisture content then dropped to 1.44 kg/kg dry solids (DS; 59 wt%) after dewatering under relative centrifugal force of 9,000 × g from 5.67 kg/kg DS (85 wt%). Pressure filtration further reduced the moisture content of filter cakes to only 0.5 kg/kg DS (33 wt%, hydrolysis temperature 180°C). After thermal hydrolysis, the heating value of sludge (moisture-free basis) was about 80% that of the untreated sludge.     

城市污泥处理处置研究现状综述

资源节约型的社会对污泥处理处置提出了更高的要求。本文简要介绍了当前污泥处理处置研究现状,并概述了污泥处理处置的常规方法与新型处理技术。