摘要
为降低电解锰渣中Mn^(2+)和NH_(4)^(+)-N的污染,实现多种固体废物减量化处理,采用锰渣、赤泥、粉煤灰3种大宗固废协同处理,并加入少量生石灰,制备无害化固结体,利用水浸法评估无害化效果,并通过BCR提取、XRD和SEM对最佳处理固结体固锰除氨机理进行分析。结果表明,通过正交实验和单因素优化实验,当固结体中锰渣、赤泥、粉煤灰、生石灰的质量分数分别为30%、44%、24%、2%时,浸出液中可溶性Mn^(2+)质量浓度降至5.23μg·L^(-1),固化率达99.99%;NH_(4)^(+)-N质量浓度降至0.70 mg·L^(-1),去除率达到99.93%,pH=8.86,能够满足《污水综合排放标准》(GB 8978-1996)最高允许排放浓度和一级标准限值;同时浸出液中Mn^(2+)、NH_(4)^(+)-N的质量浓度均满足《锰渣污染控制技术规范》(HJ 1241-2022)中锰渣利用污染控制要求,可以作为替代原料用于生产除水泥之外的其它建筑材料产品。赤泥、生石灰为处理体系提供碱度,粉煤灰增加胶凝作用,使得无害化处理效果良好。本研究结果可为大宗固废协同无害化、减量化处理提供参考。
In order to reduce the pollution of Mn^(2+)and NH_(4)^(+)-N in electrolytic manganese slag and achieve a variety of solid waste reduction treatment,three kinds of bulk solid wastes,including manganese slag,red mud and coal fly ash,were treated collaboratively,and a small amount of quick lime was added to prepare harmless consolidated body.The harmless effect was evaluated by water leaching method.The best treated consolidation was analyzed by BCR extraction,XRD and SEM.The results showed that,through orthogonal experiment and single factor optimization experiment,when the mass fraction of manganese slag,red mud,coal fly ash and quick lime in the consolidated body was 30%,44%,24%and 2%of the total mass of harmless consolidated body,respectively,the soluble Mn^(2+)concentration in the leaching solution decreased to 5.23μg·L^(-1),and the curing rate reached 99.99%.NH_(4)^(+)-N concentration decreased to 0.70 mg·L^(-1),the removal rate reached 99.93%,pH=8.86,which could met the"Comprehensive Sewage discharge Standard"(GB 8978-1996)the maximum allowable discharge concentration and the first-level standard limit.At the same time,the mass concentrations of Mn^(2+)and NH_(4)^(+)-N in the leaching solution all met the requirements of manganese slag utilization pollution control in“Technical Specification for Manganese Slag Pollution Control”(HJ 1241-2022),and can be used as alternative raw materials for the production of other building materials except cement.Red mud and quick lime provided alkalinity for the treatment system,and coal fly ash increases the gelling effect,making the harmless treatment effect good.The results of this study can provide a reference for cooperative harmless stabilization treatment of bulk solid waste.
作者
梁宇廷
孟棒棒
林晔
岳波
何莉莉
康志鹏
LIANG Yuting;MENG Bangbang;LIN Ye;YUE Bo;HE Lili;KANG Zhipeng(Research Institute of Solid Waste Management,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;School of Municipal and Environmental Engineering,Shenyang Jianzhu University,Shenyang 110168,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2023年第7期2342-2351,共10页
Chinese Journal of Environmental Engineering
基金
贵州省交通运输厅科技项目(2021-122-005)
贵州省科技计划项目(黔科合重大专项[2022]002)。
关键词
电解锰渣
赤泥
粉煤灰
无害化处理
electrolytic manganese slag
red mud
coal fly ash
harmless treatment
