风险废物焚烧飞灰玻璃募化产物风险特点

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  摘要:《大发体育在线》中HW18焚烧处理残渣皓白规则,"风险废物等退儿子体、高温熔融等处理经过产生的匪玻璃态物质和飞灰"论断为危 险废物.为投降低风险废物焚烧飞灰的生态环境为害,并祈求对其终止更好的资源募化使用,采取国际火线的玻璃募化技术对风险废物焚烧飞灰终止处理,制备违反掉落玻璃态 物质,即玻璃体.结实标注皓:①焚烧飞灰掺杂不一比例的高岭土、SiO2、CaO后,却结合适宜玻璃体烧制环境的CaO-Al2O3-SiO2系 统,经度过2 h 1 400℃高温熔融,几种不一配料比的玻璃体均却结合无定型的、微不清雅外面表平缓的构造.②玻璃体对Zn、Cr、Pb、Cd和As等重金属均拥有不一程度的固募化干 用,采取HJ/T 300-2007《刚体废物浸出产毒性浸出产方法醋酸缓冲溶液法》测得的重金属浸出产浓度均低于焚烧飞灰.③采取Hakanson公式中潜在生态为害模具对焚烧 飞灰及玻璃体终止风险评价露示,几种玻璃体的RI(潜在生态为害风险指数)均在50~100范畴内,呈中型风险,低于焚烧飞灰(299.34).④效实最 优的玻璃体的碱度(CaO/SiO2,品质分)为0.3,出产即兴浅绿色且身分透皓的外面不清雅形貌,它对Zn、Cr的浸出产浓度区别为 0.12、0.05 mg/L,但均不检出产Pb、Cd、As,远低于焚烧飞灰浸出产浓度及GB 16889-2008《生活渣滓堵埋场把持规范》中生活渣滓焚烧飞灰和医疗废物焚烧残渣浸出产限值(Zn、Cr、Pb、Cd、As浸出产浓度限值以次为 100、4.5、0.25、0.15、0.3 mg/L),该玻璃体的RI为60.05,远低于焚烧飞灰的299.34.切磋露示,采取玻璃募化技术对焚烧飞灰终止处理后,焚烧飞灰却结合无定型的玻璃态 构造,碱度为0.3时,玻璃体的重金属浸出产浓度最低,且潜在生态风险最低,为最使用于焚烧飞灰玻璃募化技术的调控比例.

  大发体育在线:风险废物 焚烧飞灰 玻璃募化技术 浸出产毒性 潜在生态为害

  Fly Ash from Hazardous Waste Incineration: Vitrification and Hazardous Characteristics    HU Jiahui1 , ZHENG Yang2 , SUN Congcong1 , ZHANG Cheng1 , ZHANG Houhu1 , JIAO Shaojun1    Abstract: The HW18 in National Hazardous Waste List clearly indicates that 'non-glassy materials and fly ash generated by hazardous waste during plasma vitrification and high temperature melting processes' are regarded as hazardous waste. In order to reduce the damage to ecology and create better resource utilization, the advanced vitrification technology is adopted to dispose of the fly ash from the incineration process of hazardous waste and obtain a vitrified sample. The results showed that, firstly, the mixing fly ash with different proportions of kaolin, SiO2 and CaO, suitable vitrification conditions of 'CaO-Al2O3-SiO2' system could be reached. After two hours' melting at 1400℃, several vitrified samples with different ingredients ratio could form an amorphous structure with a smooth microscopic surface. Secondly, the vitrified samples have a fine capacity to fix some heavy metals, such as Zn, Cr, Pb, Cd and As. According to Solid Waste-Extraction Procedure for Leaching Toxicity-Acetic Acid Buffer Solution Method (HJ/T 300-2007), the toxic substances in vitrified samples were lower than that in incineration fly ash. In addition, the potential ecological risk model put forward by Hakanson was used to evaluate the ecological risk of both fly ash and vitrified samples. The results showed that all the potential ecological risk indices of vitrified samples ranged from 50 to 100, with moderate risk, while incineration fly ash was 299.34, with comparatively high risk. At last, the most effective vitrified sample was BLT-0.3, which the basicity was 0.3, and with a light green, transparent appearance. The BLT-0.3's leaching concentration of Zn, Cr was detected as 0.12, 0.05 mg/L, respectively, and for Pb, Cd, As was not detectable, much lower than that of original fly ash of 261.60, 0.25, 2.02, 0.23, 0.18 mg/L, and less than the limit of Chinese standard for pollution control on the landfill site of municipal solid waste of 100.00, 4.50, 0.25, 0.15 and 0.30 mg/L, respectively. Moreover, the potential ecological risk index of BLT-0.3 was 60.05, far below the original fly ash index of 299.34 as well. They showed, after disposed by vitrification technology, that the fly ash from the incineration process would form an amorphous structure and obtain a vitrified sample. With a basicity of 0.3, the vitrified sample has the lowest concentration of heavy metal leaching and the lowest potential ecological risk, which is the most suitable proportion of vitrification technology for fly ash.