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Wang Shijin Wei Yanqiang 《Mitigation and Adaptation Strategies for Global Change》2019,24(7):1271-1292
Mitigation and Adaptation Strategies for Global Change - Water scarcity is a challenging environmental problem in global arid regions in the twenty-first century. Global climate change and urban... 相似文献
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A three-stage system was developed to automate a batchwise toxicity testing protocol designed for assessing wastewater toxicity to activated sludge. The three-stage system used the luminescent bacterium Shkl. The three stages were cell storage, cell activation, and continuous toxicity testing. Shkl cells were stored in a bioreactor at 4 degrees C when the system was not in use and activated in another bioreactor for use in toxicity tests conducted in a continuous manner. The system could quickly be switched between the "off" and "on" modes, and operation of the system was easy. The stability of the system, in terms of cell density and bioluminescence in the storage and activation bioreactors, and the response of the activated cells to a metal and an organic toxicant were studied. The feasibility of the system design was demonstrated by simulating zinc toxicity episodes in synthetic wastewater. The needs for further modifications and improvements of the system were discussed. 相似文献
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有效控制水华,治理富营养化水体是目前环境领域的研究热点和前沿。所谓化感物质,就是由植物、细菌、病毒和真菌所产生的二次代谢产物。利用水生植物的化感作用或化感物质抑制水体中藻类的爆发被认为是一种高效、低毒、环境亲合性好的方法而备受关注。然而,对于陆生植物应用于抑制藻类生长的研究却较少。文章在对化感作用的概念的演化、各种生物对藻类化感抑制作用、化感物质抑藻机理等方面进行了较系统的论述,总结了近年来国内外学者对于陆生植物化感作用抑藻的研究进展。文章认为相对于水生植物在抑藻方面的局限性,陆生植物的优势体现在对水生生态系统影响明显(化感作用明显)、所含抑藻化感物质种类丰富、不易受水生生态环境影响等方面,并对今后陆生植物抑藻技术的研究方向进行了展望,陆生植物中尤其是菊科植物化感抑藻应用前景广阔。最后指出,陆生植物的化感抑藻作用研究还存在进一步探索和改进化感物质的提取和鉴定方法、抑藻作用机理的研究、应用实际水体时的生态安全性等方面的问题。 相似文献
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Response surface methodology (RSM) was employed to evaluate the optimum aerobic biodegradation of dichloromethane (DCM)
in pure culture. The parameters investigated include the initial DCM concentration, glucose as an inducer and hydrogen peroxide
as terminal electron acceptor (TEA). Maximum aerobic biodegradation efficiency was predicted to occur when the initial DCM
concentration was 380 mg/L, glucose 13.72 mg/L, and H2O2 115 mg/L. Under these conditions the aerobic biodegradation rate reached
up to 93.18%, which was significantly higher than that obtained under original conditions. Without addition of glucose, degradation
efficiencies were 6 80% at DCM concentrations < 326 mg/L. When concentrations of DCM were more than 480 mg/L, the addition of
hydrogen peroxide did not help to significantly increase DCM degradation efficiency. When DCM concentrations increased from 240
to 480 mg/L, the overall DCM degradation efficiency decreased from 91% to 60% in the presence of H2O2 for 120 mg/L. 相似文献