摘要
目的探讨不同投加方式的硝酸钙法与生物法修复底泥的效果。方法于2010年3月11日,采集龙潭村河涌底泥和上覆水。分别设立对照组(不做任何处理)、生物组(加入活底1号0.55 g)、硝酸钙组(用移液管将0.13 g/ml硝酸钙溶液20.0 ml注入底泥中)和硝酸钙+沸石组(用20 g沸石吸收0.13 g/ml硝酸钙溶液20.0 ml后,撒入投加至底泥中)进行模拟实验。实验持续34 d,期间分别于13、23 d补加处理剂。定期测定上覆水水质指标[溶解氧(DO)、总磷(TP)、总氮(TN)、化学需氧量(COD)、硫化物]。向泥样中加入煮沸10 min后的污水,分别振荡3、6、9 h,测定振荡前、后水样的COD,以评价底泥的生物降解能力。结果经过34 d的处理,对照组、生物组、硝酸钙组、硝酸钙+沸石组上覆水中总磷的去除率分别为35.4%,73.1%,90.4%和88.4%;总氮的去除率分别为0,12.6%,29.5%和41.0%;COD的去除率分别为61.0%,71.3%,81.0%和70.3%;硫化物的去除率分别为95.9%,97.4%,97.9%和98.1%。生物法及硝酸钙法均可活化底泥,增大底泥的生物降解性能。结论生物修复法和不同投加方式的硝酸钙法均可抑制底泥释放磷、氮、硫化物和有机物,其中硝酸钙溶液注入法在抑制磷和有机物的释放方面效果最佳,硝酸钙+沸石法在抑制氮的释放方面效果最佳。硝酸钙在底泥修复方面有较好的应用前景。
Objective To study the effect of calcium nitrate in different adding ways and biological treatment on sediment remediation. Methods Sediment and overlying water were sampled from Longtan village river on March 11, 2010. Control group （no treatment）, biological group （added 0.55 g activation sediment 1）, Calcium nitrate group （injected 20.0 ml 0.13 g/ml calcium nitrate solution into sediment by pipette） and calcium nitrate＋zeolite group （20.0 ml 0.13 g/ml calcium nitrate solution was absorbed by 20 g zeolite and then scattered on sediment） were applied to repair sediment by simulated experiment. Experiment lasted 34 d,treatment agent was added on 13th day and 23rd day respectively. Water quality index[dissolved oxygen（DO）,total phosphorus（TP）, total nitrogen（TN）, chemical oxygen demand（COD） and sulfide] in overlying water were assayed at regular intervals. Waste water which boiled for 10 min was added to sediment and oscillated 3,6,9 h respectively, COD were assayed before and after oscillation to evaluate sediment biodegradability. Results For control group, biological group, calcium nitrate group and calcium nitrate＋zeolite group, TP removal rates were 35.4% ,73.1% ,90.4% and 88.4% respectively; TN removal rates were 0, 12.6%, 29.5% and 41.0% respectively; COD removal rates were 61.0% ,71.3% ,81.0% and 70.3% respectively; sulfide removal rates were 95.9% ,97.4% ,97.9% and 98.1% respectively after 34 d treatment. Both biological treatment and calcium nitrate treatment could activate sediment and increase the biodegradability of sediment. Conclusion Biological treatment and calcium nitrate in different adding ways may restrain sediment release phosphorus and nitrogen ,sulfur and organic matter. Among them injecting calcium nitrate method is the best one in suppressing the release of phosphorus and organic matter. Calcium nitrate＋zeolite method is the best in suppressing the release of nitrogen. Calcium nitrate in sediment remediation has a good application prospect.
出处
《环境与健康杂志》
CAS
CSCD
北大核心
2012年第5期416-419,共4页
Journal of Environment and Health
基金
广东省科技计划项目(83045)
关键词
底泥
修复
生物处理
硝酸钙
Sediment
Remediation
Biological treatment
Calcium nitrate
