排序方式: 共有41条查询结果,搜索用时 15 毫秒
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固定化藻菌去除淡水养殖废水氨氮效果及模型拟建 总被引:5,自引:0,他引:5
[目的]研究固定化藻菌去除水养殖废水氨氮效果及模型拟建.[方法]利用固定化藻菌(ABI)处理淡水养殖废水中的氨氮,采用多因子正交试验得到温度(T)、PH、光照强度(I)、溶解氧(DO)和填充率五因子与氨氮去除率(AR)之间的关系数据,拟建五因子与氨氮去除率关系模型.[结果]五因子对氨氮去除率均具有显著影响,最佳去氮氮组合为,温度30℃、pH值7.0、光照强度6 000 lx、溶解氧5.0 mg/L、填充率10%.根据实验数据拟建的方程模型决定系数R2=0.864 8,相伴概率P<0.05,对氨氮去除率的模型预测值与实际测值进行样本T-检验,结果表明总体均值差异显著值sig.为0.978(P>0.05),模型预测值与实际测值数据组无显著性差异,模型具有较高拟合度.[结论]为实现养殖废水中氨氮去除或浓度降低提供参考依据.
Abstract:
Applied Immobilized algae bacteria (ABI) to remove ammonia of freshwater aquaculture wastewater.Temperature (T),PH,light intensity (I),dissolved oxygen (DO) and filling rate five factors plays important role in the process of ammonia nitrogen removal,related data between ammonia removal and five factors was received through multi-factor orthogonal test,and established relations model between the five factor and nitrogen removal.The results show that five-factors had significant effect on AR,and the best combinations for removing AR was temperature 30 ℃,pH=7.0,light intensity 6 000 lux,dissolved oxygen 5.0 mg/L and the fill rate 10%.According to the experimental data,equation model was proposed and coefficient of determination R2=0.864 8,P<0O.05.Samples T-test was done between the model predictions and the actual measured values.Test results showed that the significant difference of overall mean value sig.(2-tailed) was 0.978 (P>0.05),it Shows that had no significant difference between model predictions and the actual measured value,and model had a high degree of fitting. 相似文献
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Jun Wang Wenhui Zhong Yu Kang Huan Deng 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2019,69(3):257-267
Adding easily decomposable organic materials into flooded nitrate-rich soils can effectively decrease the soil nitrate concentration and repair nitrate-rich soil. However, nitrate reduction is usually accompanied with an increase in N2O emission. This study was conducted to reduce N2O emission in a nitrate-rich vegetable soil flooded for remediation and amended with biochar. Nitrate-rich vegetable soil was placed in five treatment groups: flooding (F); flooding with rice straw (F?+?RS); flooding with rice straw and 1% biochar (F?+?RS?+?1% biochar); flooding with rice straw and 3% biochar (F?+?RS?+?3% biochar); flooding with rice straw and CaO (F?+?RS?+?CaO). Biochar and CaO reduced the N2O emission levels relative to the F?+?RS group, with the former being more effective than the latter, achieving reduction of 40.70% (3% biochar) and 17.35% (CaO) of cumulative N2O emission. The 3% biochar was more effective than the 1% biochar. Regression analysis showed a positive correlation between the abundance of NO reductase gene (norB) and soil N2O emission flux. In general, biochar and CaO could effectively reduce N2O emissions from a nitrate-rich vegetable soil during flooding remediation, duo to elevating soil pH and altering denitrifying activity. The norB gene was the most important denitrifying gene driving soil N2O emission in the remediation. 相似文献
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目的 探讨中医药治疗急性痛风性关节炎的用药规律,以指导临床选方用药。方法 通过以“急性痛风性关节炎”为主题词,“中医药治疗”“中医治疗”为副主题词,检索“中文期刊数据库CNKI”2010-2015年的相关医学文献,共搜索文献216篇,其中符合条件的139篇,将纳入文献中所包括的单味中药输入Excel 2003进行一般统计学分析。结果 139篇文献中,共涉及中药复方147首,药物134味,用药频次共达1 501次,其中,用药频次前10位的药物分别是:黄柏、牛膝、薏苡仁、苍术、土茯苓、泽泻、萆薢、防己、甘草、威灵仙;药物所属类别最多的分别是:清热药、活血化瘀药、祛风湿药、补虚药、利水渗湿药。结论 清热利湿、活血通络、泄浊解毒、兼顾补虚对急性痛风性关节炎具有较好疗效。 相似文献
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通过对优质丰产杂交油菜新品种黔油14号母本移栽密度及可育株拔除技术的研究,结果表明,处理A1B1(母本移栽密度7 500株/667m2、可育株采用挤浆识别拔除)制种产量最高(77.42 kg/667m2),处理A2B3(母本移栽密度5 625株/667m2、可育株采用看花识别拔除)制种产量最低(55.74 kg/667m2),极差为21.68 kg/667m2。可育株识别拔除技术间制种产量差异极明显,以挤浆识别拔除的处理(B1)平均产量最高(75.83 kg/667m2),分别较看花识别拔除处理(B3)和花蕾形态识别拔除处理(B2)增产33.95%和12.49%,均达极显著水平。 相似文献
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沉积物-水体界面氮磷的迁移转化规律研究进展* 总被引:13,自引:0,他引:13
沉积物-水体界面氮磷等营养物质的迁移转化对湖泊生态系统的研究具有重要意义。综合分析了沉积物和水体的氮磷浓度、比例、形态特征及其与藻类生长的关系,系统概述了沉积物-水体界面氮磷的迁移转化研究进展,并介绍了滇池该方面的研究现状。 相似文献
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[目的]使污水处理厂出水中磷的排放浓度稳定达标。[方法]在自制反应装置中使用电凝聚技术并投加混凝剂Al2(SO4)3对含磷废水进行处理,并对极板间距、电流密度、pH值、通电时间和混凝剂投加量等因素对磷去除率的影响及除磷效果进行研究。[结果]在最佳电流密度2.5mA/cm^2、极板间距1.5cm、pH值为7时,投加15mg/L混凝剂Al2(SO4)3,电解30min,磷的去除率达到90.1%。[结论]电凝聚-混凝技术除磷具有很好的效果。电极极化钝化是电凝聚有效运行的主要障碍,是后续研究的需要解决的关键问题。 相似文献
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