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陈德珍,龚佰勋,姜宗顺,Christensen TH.绿矾处理垃圾焚烧灰渣过程中重金属的同时稳定化研究[J].环境科学学报,2005,25(1):128-134
绿矾处理垃圾焚烧灰渣过程中重金属的同时稳定化研究
- Treatment of waste incineration residues with copperas: Investigations of reaction conditions for simultaneously stabilizing different heavy metals
- 基金项目：上海市青年科技启明星计划项目（01QF4040）；2001～2002年度中国-丹麦政府交换奖学金资助项目
- 作者
- 单位
- 陈德珍
- 同济大学热能与环境工程研究所, 上海 200092
- 龚佰勋
- 深圳市市政环卫综合处理厂, 深圳 518019
- 姜宗顺
- 深圳市市政环卫综合处理厂, 深圳 518019
- Christensen TH
- Environment & Resources DTU, TechnicalUniversity of Denmark, DK22800 Lyngby, Denmark
- 摘要：采用绿矾稳定垃圾焚烧灰渣(包括飞灰及底排渣)中的重金属,将绿矾溶液与灰渣混合然后实施氧化过程.以Pb,Hg,Cd,As和Cr为代表,研究各类重金属同时稳定化的反应条件,着重研究了铬的稳定条件.研究结果表明重金属Pb在各种条件下的稳定效果良好;As和Cd的稳定化效果随绿矾用量的增加而增强,其中Cd还受过程pH值的影响.厌氧阶段的设置、CO2的辅助处理、提高绿矾的用量都有助于Cr的稳定化;同时使用CO2辅助处理也有助于As的稳定化,但CO2只适用于强碱性、高酸中和能力的灰渣.反应温度在常温至90℃变化只影响氧化速度.研究还表明飞灰与底排渣可作为一股废物流同时处理.对Hg,应从研究其物质形态出发来研究它的稳定.
- Abstract：Municipal solid waste incineration ashes (fly ashes and bottom ashes) were chemically stabilized with copperas. In the treatment process the copperas solution was mixed with incineration ashes and then followed an oxidation process (the Ferrox-process). Pb, Cr, Cd, As and Hg were chosen as representatives for different kinds of heavy metals and the main purpose was to find the proper reactive conditions for simultaneously stabilizing all of them with emphasis on Cr stabilization. The following affecting factors were investigated: anaerobic step, auxiliary treatment with CO2 before oxidation, amount of copperas supplied and process temperature. The investigation showed that good stabilization effect could be obtained for Pb under all tested conditions; with more amount of copperas supplied, better effect was found for As and Cd, but Cd leaching was also influenced by pHvalue in the treatment process. Anaerobic step, auxiliary treatment with CO2 and larger amount of copperas supply enhanced Cr stabilization; at the same time auxiliary treatment with CO2 was also found favorable for As stabilization, but CO2 treatment is suggested only for ashes with high acid neutralizing capacity. When process temperature changing from normal temperature up to 90℃, only the oxidation speed was affected without distinct influence on stabilization effect. The research results also showed that fly ash and bottom ash could be treated together as one stream of waste. Furthermore, species of mercury in the ashes should be investigated for its leaching control.
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