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131.
开发沸石矿用于农业的经济评价 总被引:2,自引:0,他引:2
我国沸石矿资源丰富。开发利用沸石矿于农业,可增产粮食400亿公斤,加上节约化肥和用作饲料添加剂等方面,年经济效益为496.25亿元。因此,开发利用沸石矿于农业具有重大的经济意义,从促进我国粮食生产上新台阶的角度考虑,则具有重大的战略意义。 相似文献
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一体化间歇曝气完全混合活性污泥法处理装置采取特殊的沉淀区构造,改变了活性污泥的循环流动方式,通过间歇曝气,反应区交替处于好氧/缺氧状态,达到了有机物高效去除、高效硝化反硝化及控制污泥膨胀的效果.该方法具有出水水质好、运行稳定、能耗低、流程简洁和操作管理方便的特点,是一种很有发展潜力的一体化中小型生活污水、城市污水处理系统. 相似文献
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为了提高介质阻挡放电(dielectric barrier discharge,DBD)等离子体的处理效率,研究了内外介质组成分别为:(1)石英 石英;(2)陶瓷 石英;(3)陶瓷 陶瓷这3种情况下苯的降解情况.试验结果表明,在处理低浓度含苯废气时,陶瓷 陶瓷效果最好;陶瓷(内管) 石英(外管)在处理高浓度含苯废气时显示出优势.通过对气相产物和固相结焦产物的分析验证了DBD能有效降解苯,降解产物不会带来新的污染.进一步分析了实验条件和介质材料的变化对DBD降解苯的影响机理. 相似文献
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Suwei Zhang Qijie Zhang Armand Albergel Didier Buty Liangmin Yu Haiting Wang Wuxia Bi Peng Cheng Fu Chen Jun Fang Ruirui Hou Xudong Luan Changgan Shu Jingjing Su 《环境科学学报(英文版)》2018,30(9):119-126
Particulate matter(PM) in the Kunshan High-Tech zone is studied during a three-month campaign. PM and trace elements are measured by the online pollution monitoring, forecastwarning and source term retrieval system AS3. Hourly measured concentrations of PM_(10), PM_(2.5) and 16 trace elements in the PM_(2.5) section(Ca, Pb, Cu, Cl, V, Cr, Fe, Ti, Mn, Ni, Zn, Ga, As, Se, Sr, Ba)are focused. Source apportionment of trace elements by Positive Matrix Factorization modeling indicates that there are five major sources, including dust, industrial processing, traffic,combustion, and sea salt with contribution rate of 23.68%, 21.66%, 14.30%, 22.03%, and 6.89%,respectively. Prediction of plume dispersion from concrete plant and traffic emissions shows that PM_(10) pollution of concrete plant is three orders of magnitude more than that of the traffic. The influence range can extend to more than 3 km in 1 hr. Because the footprint of the industrial plumes is constantly moving according to the local meteorological conditions, the fixed monitoring sites scattered in a few hundred meters haven't captured the heaviest pollution plume at the local scale of a few km~2. As a more intensive monitoring network is not operationally possible, the use of online modeling gives accurate and quantitative information of plume location, which increases the spatial pollution monitoring capacity and improves the understanding of measurement data. These results indicate that the development of the AS3 system, which combines monitoring equipment and air pollution modeling systems, is beneficial to the real-time pollution monitoring in the industrial zone. 相似文献
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Hongxun Hou Shuying Wang Yongzhen Peng Zhiguo Yuan Fangfang Yin Wang Gan 《Frontiers of Environmental Science & Engineering in China》2009,3(1):106-111
The anaerobic-anoxic oxidation ditch (A2/O OD) process is popularly used to eliminate nutrients from domestic wastewater. In order to identify the existence of denitrifying
phosphorus removing bacteria (DPB), evaluate the contribution of DPB to biological nutrient removal, and enhance the denitrifying
phosphorus removal in the A2/O OD process, a pilot-scale A2/O OD plant (375 L) was conducted. At the same time batch tests using sequence batch reactors (12 L and 4 L) were operated
to reveal the significance of anoxic phosphorus removal. The results indicated that: The average removal efficiency of COD,
NH4+, PO43−, and TN were 88.2%, 92.6%, 87.8%, and 73.1%, respectively, when the steady state of the pilotscale A2/O OD plant was reached during 31–73 d, demonstrating a good denitrifying phosphorus removal performance. Phosphorus uptake
took place in the anoxic zone by poly-phosphorus accumulating organisms NO2− could be used as electron receptors in denitrifying phosphorus removal, and the phosphorus uptake rate with NO2− as the electron receptor was higher than that with NO3− when the initial concentration of either NO2− or NO3− was 40 mg/L. 相似文献
140.
我国古代文学的每个时期都有富于特色的文学形式,也有独具魅力的灾害文学作品,本文从各个历史时期抽离出具有代表性的灾害文学作品,如先秦时期的灾害神话和灾害诗歌,两汉魏晋时期的灾害诗歌和散文,唐宋时期的灾害诗歌,元明清时期的灾害小说等等,并对这些作品进行简单分析,以实现灾害文学基础性研究之目的。 相似文献