不同诱导条件对结晶产物形貌特征的影响

在流化床反应器中,以含铜废水为处理对象,重点考察了诱导条件改变对结晶系统运行效率及结晶产物形貌特征的影响。结果表明,进水200 mg/L,进药比([Cu2+]/[CO32-])1:1.2,pH为10.2的条件下,铜离子去除率可接近100%,诱导晶种表面平滑,诱导颗粒生长成致密杆状晶体结构,以碳酸盐为沉淀剂的诱导结晶系统依赖于体系的pH,高pH体系下发生的共结晶现象是影响系统运行的主要原因;随着进药摩尔比的增加,结晶产物由短杆状向球状转化,晶体机械强度显著降低大量破碎,影响出水水质;进药比1:1.2,pH为11的条件下,含铜废水浓度为500 mg/L时,系统去除率可达95%以上,微晶产率低于5%。     

稀土在湿地松种子园上的应用研究

在广东西江林业局仙菊林场湿地松(Pinus elliotii)种子园对13年生母树分别于每年雌花期和坐果期喷施两次不同浓度的稀土“常乐”,三组处理为(花-果期)0.25—0.25gL~(-2)、0.25—0.50gL~(-1)和0.50—1.00gL~(-1),并以喷清水为对照。结果表明,三组稀土处理都使母树的球果和种子产量提高,单株产果量平均提高3ε.9％,产种量平均提高35.1％;种子的饱满度和生活力改善,千粒重提高3.9—26.4％,发芽率提高6.2—18.5％;各观测项都以喷施0.50—1.00g L~(-1)浓度的效果最显著。这一研究成果为优化松树品质与提高经济收入创造了有利条件。     

浙江嘉善东部区域盛家湾河道缓冲带及水生态修复实践

河流生态修复是改善水质和维持河流生态系统稳定的重要措施,是贯彻落实“十四五”重点流域水生态环境保护总体要求的重要举措。以嘉善姚庄镇俞汇塘支流盛家湾河道为研究对象,探讨了河流缓冲带与水生态修复工程实践。针对该区域生态空间严重被挤占、部分河段生境受损严重、生物多样性降低、河道水质不稳定等环境问题,提出了以保护—修复—发展为创新思路的盛家湾河道生态修复工程总体方案;以全面提升河道的水生态环境质量、构建健康稳定的水生态系统为修复目标,实施了面源污染阻控、生态空间恢复以及水生态修复等工程,其中包括面积为17 700 m²的人工湿地及2 200 m长的生态植草沟建设,约30 m宽和1 480 m长的陆域植被缓冲带构建,1 210 m长的河岸线生态化改造,以及面积为20 400 m²的水下森林生态修复工程。通过盛家湾河道的生态修复,全面改善了盛家湾区域的生态环境,实现了“水清岸绿”,恢复了水体的生物多样性。

     

Renewables as a pathway to environmental sustainability targets in the era of trade liberalization: empirical evidence from Turkey and the Caspian countries

Environmental Science and Pollution Research - The quest for improved environmental quality through low-carbon emission has been explored in this study in the wake of the growing call for a...     

Comparisons of three plant species in accumulating polycyclic aromatic hydrocarbons (PAHs) from the atmosphere: a review

Environmental Science and Pollution Research - Plant leaves play a key role in the accumulation of PAHs, as they are able to capture PAHs from the air. In this paper, the mechanism, including...     

三种海藻凝集素细胞凝集活性的比较

比较了3种经纯化的海藻凝集素即铁钉菜凝集素（IOL），鹿角沙菜凝集素（HCL0和脆江蓠凝集素（GBL）对红细胞，微藻，细菌，酵母及肿瘤细胞的凝集活性，IOL对供试的动物红细胞均有凝集作用，而HCL和GBL只对部分红细胞产生凝集作用，3种凝集素都不能凝集人的A，O，B型血红细胞。在12种供试的微藻中，有6种单细胞藻类分别被海藻凝集素所凝集，海洋微藻比淡水微藻敏感，盐生杜氏藻均可被3种海藻凝集素所凝集，3种海藻凝集素都能凝集枯草杆菌，但不能凝集胃癌细胞，3种凝集素中，IOL对细胞的凝集作用最好，表3参13     

活性炭膜处理工业废水的试验研究

将活性炭膜与常规弹性材料同时作为生物接触氧化处理工艺的填料,分别加装在相同条件的两套接触氧化池中,采用生物接触氧化处理工艺,在同样的条件下处理工业废水,经过对试验数据的对比分析得出:以活性炭膜为填料,处理废水的能力更强,净化效果更好。     

汶川地震灾区过渡房安置点场地选择中的地震问题

大地震后,如何在最短的时间内在灾区选择比较安全的过渡房安置点建设场地,是一项具有挑战性的工作。本文以四川省汶川8.0级大地震后灾区群众快速安置为背景,论述了选择过渡房安置点场地必须考虑的地震问题,并提出了处理地震断层、地表裂缝、砂土液化、坍塌等实际问题的方案;利用强余震的预测结果,分析了这些灾害对场地可能造成的危害;同时对可能潜在的滑坡、危岩崩塌、泥石流等地质灾害提出相应的处理建议,供安置点规划建设参考。     

Plasticity in metamorphic traits of <Emphasis Type="Italic">Rana kukunoris</Emphasis> tadpoles: The interactive effects of food level and rearing temperature

Larval amphibians are particularly likely to encounter variation in rearing temperature and resource availability due to variation in aquatic breeding habitats. In this study, plasticity in growth rates, larval mass, larval period, and size at metamorphosis were examined in Rana kukunoris Nikolskii, 1918 under different combinations of temperature and food level. Larval period and larval body mass was sensitive to food level, and varied with temperature. Tadpoles metamorphosed at an older age at low temperature than those reared at warm temperature. Food level was a significant affect on larval period at low temperature, but not at warm temperature. Mass was heavier for tadpoles reared at low temperatures than those reared at warm temperatures. The effect of food level depended on temperature, because larvae reared at low temperature that were offered a high food level achieved a larger size than larvae offered a low food level, but this did not occur at warm temperature. Therefore, we suggest that high food availability at low temperature prolonged developmental periods, thus larvae are larger as metamorphs than those reared at warm temperatures.