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21.
以从大庆油田采出水中筛选到的硫酸盐还原菌SRB-2和反硝化细菌DNB-1为目的菌,考察两者之间的竞争抑制关系,以及添加营养物质的种类和浓度对SRB-2数量及产H2S活性的影响。结果表明,当体系中硝酸盐浓度为0.5 g/L或亚硝酸盐浓度为0.1-0.5 g/L时,DNB-1就能够有效降低SRB-2活性,抑制H2S的产生,抑制时间10 d以上,H2S产生可以减少85%以上;当体系中硝酸盐浓度为0.1-0.25 g/L时,在10 d内DNB-1对SRB-2活性和产H2S活性也有较好的抑制效果,H2S产生减少65%左右;亚硝酸盐对SRB-2生长的抑制作用好于硝酸盐。  相似文献   
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23.
恶臭气体生物处理技术研究进展   总被引:5,自引:0,他引:5  
介绍了恶臭气体的种类、危害、特征、处理方法及原理;概述了恶臭气体的3种主要生物处理方法:生物滤池、生物滴滤池和生物洗涤器,介绍3种方法的工艺流程、技术特点及最新研究进展;提出了生物法处理恶臭气体亟需解决的问题及研究方向。  相似文献   
24.
This paper is based on long-term monitoring data for soil water, salt content, and groundwater characteristics taken from shelterbelts where there has been no irrigation for at least 5 years. This study investigated the distribution characteristics of soil water and salt content in soils with different textures. The relationships between soil moisture, soil salinity, and groundwater level were analyzed using 3 years of monitoring data from a typical oasis located in an extremely arid area in northwest China. The results showed that (1) the variation trend in soil moisture with soil depth in the shelterbelts varied depending on soil texture. The soil moisture was lower in sandy and loamy shelterbelts and higher in clay shelterbelts. (2) Salinity was higher (about 3.0 mS cm?1) in clay shelterbelts and lower (about 0.8 mS cm?1) in sandy shelterbelts. (3) There was a negative correlation between soil moisture in the shelterbelts and groundwater level. Soil moisture decreased gradually as the depth of groundwater table declined. (4) There was a positive correlation between soil salinity in the shelterbelts and the depth of groundwater table. Salinity increased gradually as groundwater levels declined.  相似文献   
25.
● A study assessing the temperature-injury relationship was conducted among students. ● The maximum risks of injury appeared at moderate temperatures. ● The temperature effect on outdoor falls was greater in older students. Although studies have suggested that non-optimal temperatures may increase the risk of injury, epidemiological studies focusing on the association between temperature and non-fatal injury among children and adolescents are limited. Therefore, we investigated the short-term effect of ambient temperature on non-fatal falls and road traffic injuries (RTIs) among students across Jiangsu Province, China. Meteorological data and records of non-fatal outdoor injuries due to falls and RTIs among students aged 6–17 were collected during 2018–2020. We performed a time-stratified case-crossover analysis with a distributed lag nonlinear model to examine the effect of ambient temperature on the risk of injury. Individual meteorological exposure was estimated based on the address of the selected school. We also performed stratified analyses by sex, age, and area. A total of 57322 and 5455 cases of falls and RTIs were collected, respectively. We observed inverted U-shaped curves for temperature-injury associations, with maximum risk temperatures at 18 °C (48th of daily mean temperature distribution) for falls and 22 °C (67th of daily mean temperature distribution) for RTIs. The corresponding odds ratios (95% confidence intervals) were 2.193 (2.011, 2.391) and 3.038 (1.988, 4.644) for falls and RTIs, respectively. Notably, there was a significant age-dependent trend in which the temperature effect on falls was greater in older students (P-trend < 0.05). This study suggests a significant association between ambient temperature and students’ outdoor falls and RTIs. Our findings may help advance tailored strategies to reduce the incidence of outdoor falls and RTIs in children and adolescents.  相似文献   
26.
累托石/氧化亚铜纳米复合材料的制备及光催化性能研究   总被引:1,自引:0,他引:1  
以累托石为载体,用液相合成法制备了累托石/纳米氧化亚铜复合材料,采用SEM、XRD对其进行了表征,并以吸附降解亚甲基蓝的效果探讨了复合材料的吸附及光催化性能.结果表明,在最佳条件为:溶液呈碱性,亚甲基蓝初始浓度90 mg/L,复合材料用量1.33 g/L,温度60℃,反应20 mim时复合材料对亚甲基蓝的降解率可达到9...  相似文献   
27.
赵辉  程学文  刘正  栾金义 《化工环保》2011,31(6):524-527
采用“催化氧化—混凝沉淀—多介质过滤—超滤—反渗透”处理工艺,对某厂达标橡胶废水进行深度处理中试试验研究.试验结果表明,各处理单元均能达到预期处理效果,系统出水水质优于当地地下水及循环水补水指标,废水回用产生的经济效益为0.96元/m3.  相似文献   
28.
液膜法处理含硝基酚废水试验研究   总被引:3,自引:0,他引:3  
栾金义  李昕  王宜军 《化工环保》2003,23(4):195-199
采用液膜法对含硝基酚废水进行了处理试验研究。对低浓度废水选取了适宜的工艺条件:油相中表面活性剂的质量分数为2%;内水相中NaOH的质量分数为2%;乳液中油相与内水相的质量比为2:1;外水相:pH为2;乳液与外水相的体积比为1:3。在进水总酚质量浓度分别为1050、6700mg/L的条件下,出水总硝基酚的去除率均高达99.9%以上,同时废水中的硝基苯和COD也有较好的去除效果。  相似文献   
29.
分别采用扫描电子显微镜和能量色散谱仪对炼油废水体系中超滤膜表面污染物进行了形貌观测和元素组分含量分析,并研究了炼油废水中Fe、Si和Al含量对超滤膜表面形态和污染物组成的影响.实验结果表明:超滤膜表面的主要污染物为Ca,Fe,Si,Al,Mg的化合物形成的凝胶,元素含量大小顺序为Fe> Ca> Si> Mg> Al;随...  相似文献   
30.
研究了采用不同pH的酸、碱清洗液及阻垢剂溶液静态浸泡对聚偏氟乙烯(PVDF)和聚四氟乙烯(PTFE)疏水平板膜接触角的影响.实验结果表明:随pH 2.5盐酸和pH2.0草酸浸泡PVDF膜和PTFE膜时间的延长,两种疏水膜的接触角均小幅度减小,说明酸性清洗液对两种疏水膜性能的影响较小;随pH11.5NaOH溶液浸泡膜时间...  相似文献   
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