摘要
目的研究牡蛎壳的改性及评价其对水中污染物的去除性能。方法采用不同煅烧条件(温度:300、400、600、800℃;时间:10、20、30、40、60 min)对天然牡蛎壳进行热改性,通过分析其对水中有机物、氮和磷的去除效果,筛选出最佳改性条件。结果经热改性的牡蛎壳,结构更为复杂,孔隙数量增多,同等条件下较天然牡蛎壳对溶液中磷的吸附效果有显著提高,特别是经800℃煅烧20 min的牡蛎壳对溶液中磷的去除率可达95.3%。该条件下改性的牡蛎壳在对污染物进行动态去除过程中,挂膜效果良好,对模拟生活污水中化学需氧量(300 mg/L)、氨氮(20 mg/L)、总氮(30 mg/L)和总磷(6 mg/L)的去除率分别可维持在73.0%~88.0%、57.5%~67.5%、60.3%~75.0%和92.1%~99.6%之间。结论经800℃煅烧20 min处理的牡蛎壳挂膜效果良好,对水中有机物的去除效果佳,是作为处理生活污水基质的优良选择。
Objective To explore the modification of oyster shells and the related removal effects on pollutants in water.Methods Raw oyster shells were modified under different calcination conditions(temperature:300,400,600,800℃;time:10,20,30,40,60 min),and then the optimal calcination condition was obtained by analyzing the removal effects on organic matter,nitrogen and phosphorus in water.Results Calcination made structures of oyster shell more complicated,and the number of pores increased.As a result,the modified oyster shells showed a higher efficiency in removing phosphorus,compared with raw oyster shells under the same condition.Particularly,the phosphates removal efficiency of oyster shells modified at800℃for 20 min was up to 95.3%.The modification of oyster shells revealed effective biofilm culture.The dynamic removal efficiency of oyster shells to 300 mg/L chemical oxygen demand(CODCr),20 mg/L ammonia nitrogen(NH4+-N),30 mg/L total nitrogen(TN),and 6 mg/L total phosphorus(TP)in simulated domestic wastewater were 73.0%-88.0%,57.5%-67.5%,60.3%-75.0%and 92.1%-99.6%respectively.Conclusion The oyster shells calcined at 800℃for 20 min is efficient in biofilm culture,as well as in removing organic compounds,which can be used as a preferable choice of the substrate for treatment of domestic wastewater.
作者
张巧
谢帮蜜
杨晟
申芝芝
朱婷婷
彭盛华
ZHANG Qiao;XIE Bang-mi;YANG Sheng;SHEN Zhi-zhi;ZHU Ting-ting;PENG Sheng-hua(State Environmental Protection Key Laboratory of Drinking Water Source Management and Technology,Shenzhen Key Laboratory of Emerging Contaminants Detection and Control in Water Environment,Shenzhen Research Academy of Environmental Sciences,Shenzhen,Guangdong 518001,China)
出处
《环境与健康杂志》
CAS
北大核心
2019年第2期159-162,共4页
Journal of Environment and Health
基金
深圳市科技研发资金项目(CXZZ20130517152035590)
深圳市科技计划(JSGG20160429162015597)
关键词
牡蛎壳
煅烧
吸附
化学需氧量
氮
磷
Oyster shells
Calcination
Adsorption
Chemical oxygen demand
Nitrogen
Phosphorus
