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481.
482.
Shin'ya Hayashi Kanemasa Nomaguchi Tsutomu Okusawa Osamu Yokomizo Yukio Ishigaki Hitoshi Ishimaru 《Journal of Material Cycles and Waste Management》2000,2(1):57-62
Fiber-reinforced plastics (FRP) were first used as a material for boats and bath tubs about 40 years ago. Because of their
great durability, wastes including FRP products are increasing. In addition, since the FRP resin is synthesized from expensive
reactants, material recycling is highly desirable. Recycling using supercritical water is one solution; however, the cost
of producing the high pressure and temperature needed to produce supercritical water prevents the concept from being realized.
Therefore, we proposed a system concept based on dual waste-plastics recycling. A numerical survey of the results confirmed
that our concept was feasible and would contribute to resource recycling as we expected.
Received: January 6, 1998 / Accepted: July 23, 1999 相似文献
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采用管式炉对污水厂活性污泥焚烧过程中Ni的迁移分布特性进行研究。实验结果表明:当污泥掺烧量(污泥质量与煤和污泥总质量的比)为25%时,Ni的挥发率(飞灰与气体中Ni质量的总和与污泥中Ni质量的比)几乎为零,且污泥与煤混合试样的综合燃烧效果最好;当污泥焚烧加入硫化物时,各种硫化物对Ni的残留率(炉渣中Ni的质量与污泥中Ni质量的比)提高能力大小顺序为Na2S>S>Na2SO3>Na2SO4;当污泥焚烧加入氯化物时,促使Ni向烟气中迁移,且加入无机氯更易使Ni向烟气中迁移。 相似文献
485.
A preliminary assessment on reusage of flyash emitted from fluidized bed incineration of sludge cake
Reusage or recycle of flyash can eliminate the cost of final disposal and prevent secondary pollution caused by inappropriate flyash disposal. It is well known that the flyash emitted from fluidized bed incineration (FBI) is fine particle. Moreover its properties are more similar to concrete than that of ash from other incinerators. A promising and economical reusage of flyash is in concrete material. Prior to this application, it is necessary to explore the characteristics of cement mixed with flyash. Besides analyzing the general physical and chemical properties of FBI flyash, this article presents a preliminary assessment on reusage of FBI flyash in concrete by a series of experimental tests on the characteristics of flyash-cement paste, including the macrocharacteristics of fresh cement paste e.g. workability, bleeding water, setting time, compressive and tensile strengths, and micro-characteristics, e.g. paste hardening, pore distribution, and crystal structure. Effects of flyash amount in the paste and of flyash size on these properties are also studied. An approach to evaluate the reusage of flyash by inspecting the characteristics of flyash-cement paste is proposed, and leads to a potential reusage scheme for the FBI flyash as a concrete material resource. 相似文献
486.
Adsorption of Cotton Fabric Dyestuff Waste Water on Nigeria Agricultural Semi-Activated Carbon 总被引:2,自引:0,他引:2
P. T. E. Ozoh 《Environmental monitoring and assessment》1997,46(3):255-265
The Kaduna river in Nigeria is in such great environmental stress that the self-purifying capacity of the river has been exceeded as a result of industrial discharges. The river water is blue-green and pollution build-up is evident on the river banks. Techniques were designed to rid the river of visible signs of pollution by incorporating the principles of adsorption and incineration.Semi-activated carbon from agricultural wastes were used to treat the waste water. Residual colors, amber, yellow and orange, were obtained and the solute removed ranged from 96-99.8% and the volatile residue removed by carbon treatment ranged from 3-3.8%. Incineration of 1 kg waste water yielded 40 g solid residue.Adsorption of dyestuff present in the waste water was linear and increased with concentrations of waste water per unit mass of guinea corn carbon. Replicate results yielded: y = 2.5 + 0.130x y = 2.306 + 0.017x where x =log10% concentration of dyestuff waste water (independent variable); y = log10 adsorption of dyestuff waste-weight gramme-1 carbon. Unit of weight = milligramme (dependent variable).For maize carbon, adsorption was linear but decreased with increasing concentrations. Replicate results were: y = 1.583 - 0.21x y = 0.52 - 0.32x x and y here are the same as above; with cane sugar carbon, adsorption was independent of concentrations. Student t-test showed no statistical difference between the replicates at the 99.5% level. 相似文献
487.
向飞灰中添加硅灰与一定比例的去离子水,混合均匀后分别进行自然养护、蒸汽养护和中温热处理.研究了自然养护和蒸汽养护条件下硅灰不同添加量对垃圾焚烧飞灰浸出毒性的影响,考察了蒸汽养护样与中温热处理样的重金属化学形态分布、晶体结构和微观形貌变化.结果表明:自然养护和蒸汽养护条件下,随着硅灰添加量由0%升至10%,飞灰中Pb、Cd、Cr和Cu的浸出浓度均随之降低.硅灰添加量为10%时,硅灰蒸汽养护样中Pb、Cd、Cr和Cu的浸出浓度略低于硅灰自然养护样,金属化学形态分布相比原灰变化较小;硅灰中温热处理对飞灰中Pb、Cd、Cu和Zn处理最为彻底,4种金属残渣态占比相比原灰分别从原灰的37.12%、11.82%、44.30%和51.94%升高至84.75%、75.49%、77.20%和67.40%,酸溶态分别由原灰的3.99%、54.92%、6.56%和10.49%降低至0.44%、9.37%、2.72%和3.59%. 相似文献
488.
以沈阳市某污水处理厂剩余污泥为原料,采用小型流化床对污泥进行焚烧,利用布袋和荷电低压颗粒物撞击器(ELPI+)对细颗粒物进行收集,研究焚烧温度、污泥粒径、CaO的添加量对重金属赋存特性和细颗粒物微观形貌的影响,利用热力学软件FactSage7.2研究焚烧过程中重金属化学形态的变化.结果表明,随着焚烧温度的升高,残渣态变化最为明显,Cd、Cr、Cu、Pb和Zn 5种重金属的残渣态增幅均在15%以上,其中重金属Cd的变化最为明显,残渣态增幅高达29%.随着污泥粒径的增大,矿物质和焦炭颗粒的破碎程度减小,最终以矿物质和焦炭破碎为来源的一些粒径较大的细颗粒物数量增加.此外,总体上重金属的赋存形态随着粒径的增加向着稳定的趋势发展.在焚烧过程中CaO是可以作为颗粒之间良好的粘合剂,促进细颗粒物之间的成长和团聚.随着CaO的添加,细颗粒物聚并成了一个更大的球状颗粒整体. 相似文献
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490.