煤气化炉渣免烧陶粒的制备及其在反硝化滤池中的应用
Preparation of non-sintering coal gasification slag ceramsite and its application in denitrification filter
张祎旸 1武陈 1曹宗仑 1王岽 1孙杰1
作者信息
- 1. 中石化(北京)化工研究院有限公司,北京 100013
- 折叠
摘要
煤气化炉渣是煤气化过程中产生的固体废弃物.大量的炉渣堆积不仅造成了资源的浪费,而且增加了企业的运营成本,对当地环境造成危害.以内蒙古地区的煤气化炉渣为主要原料,加入水泥、生石灰、CaSO4 等,通过免烧结的方式制备陶粒.在制气炉渣、水泥、生石灰、CaSO4 质量比为 70∶30∶2.5∶5的条件下制得的陶粒性能最优越,比表面积可达 51.7 m2/g,堆积密度为 809 kg/m3,颗粒破碎强度为 6.61 MPa.将该陶粒用作反硝化生物滤池填料,相比于普通市售陶粒挂膜速度更快;在水力停留时间(HRT)为12h时,化学需氧量(COD)由300 mg/L下降至 60 mg/L以下,COD去除率在 80%以上;硝态氮(NO3--N)由60 mg/L下降至2mg/L以下,NO3--N去除率在 95%以上.利用煤气化炉渣制备免烧结陶粒实现了煤气化炉渣的资源化利用,同时为污水反硝化处理提供了一种新的填料.
Abstract
Coal gasification slag is a solid waste generated during the coal gasification process.Coal gasification slag generated in Inner Mongolia region,China is mixed with cement,quicklime and CaSO4 to prepare ceramsite through a non-sintering method.Result shows that the optimal raw materials mass ratio is coal gasification slag∶cement∶quicklime∶CaSO4=70∶30∶2.5∶5.Specific surface area of non-sintered ceramsite prepared under this ratio can reach 51.7 m2·g-1,bulk density is 809 kg·m-3,and particle crushing strength is 6.61 MPa.Using this ceramsite as a filler for denitrification biofilters results in a faster biofilm formation rate than using ordinary commercially available ceramsite.Chemical oxygen demand(COD)decreases from 300 mg·L-1 to below 60 mg·L-1,with a removal rate over 80%when the prepared ceramsite is used as fillers for denitrification biofilters and the hydraulic retention time(HRT)is 12 h.The content of nitrate nitrogen(NO3--N)decreases from 60 mg·L-1 to below 2 mg·L-1,with a removal rate over 95%.This routine achieves re-utilization of coal gasification slag and provides a new filler for wastewater denitrification treatment.
关键词
煤气化炉渣/免烧结陶粒/填料/反硝化/除COD/除NO3--NKey words
coal gasification slag/non-sintering ceramsite/filler/denitrification/COD removal/NO3--N removal引用本文复制引用
出版年
2024
NETL
NSTL
万方数据