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刚毛藻对Cu、Fe、Zn的耐受与污染控制研究 总被引:1,自引:0,他引:1
研究刚毛藻对Cu、Fe、Zn的耐受情况。实验设计了3种重金属的浓度,分别为00、.5 mg/L1、.0 mg/L、2.5 mg/L、5.0 mg/L、7.5mg/L1、0 mg/L的培养液,培养期间观察记录刚毛藻的长势,测定藻类生物量及叶绿素a的含量变化,研究藻体对模拟水中3种重金属的去除动态及实际去除效果。结果表明,3种重金属在低浓度(0.5—2.5 mg/L)时藻体长势较好;浓度达到5mg/L时开始出现毒害现象,表现为叶绿素a含量下降趋势;浓度达到7.5mg/L以上时藻体死亡。水体中有效Cu、Fe、Zn浓度较低时,藻体对3种重金属去除效果较好,较高浓度时由于毒害作用使其对3种重金属的去除能力下降。 相似文献
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船舶压载舱中环境因子对夜光藻生长的影响研究 总被引:1,自引:0,他引:1
采用正交实验法分别从气液接触面积与液体体积比、温度和初始浓度3个影响因子4个水平对夜光藻的生长变化率进行研究。研究结果表明,在实验范围内,气液接触面积与液体体积比为0、温度为17℃、初始浓度为10×106cell/L时,藻细胞浓度递减速率最大;影响夜光藻细胞浓度变化速率因素的强弱顺序是:初始浓度〉气液接触面与体积比〉温度。 相似文献
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利用粉煤灰处理含磷废水的研究 总被引:22,自引:1,他引:22
为了解决水体富营养化,以粉煤灰作为吸附剂,对含磷为50-120mg/L模拟废水脱硫的规律特征进行探讨,试验结果表明,粉煤灰是一种有效的吸附剂,在含P浓度为50-120mg/L,粉煤灰用量每50mL为2-2.5g,粒径范围140-160目,pH中性的实验条件下,磷的去除率最高可达99%以上。 相似文献
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用喷雾干燥和表面吸附固定化两种工艺对石油降解菌剂进行固态菌研制。结果表明:在对菌浓度为9.7×109 cfu/mL的500mL发酵液添加40g轻质碳酸钠后进行喷雾干燥,在进风温度为120℃,进样量为12mL/min的条件下,得到粉剂产品56g,含水量为4.6%,菌密度为10.05×109 cfu/g,产品得率为11.6%;在对菌浓度为9.7×109 cfu/mL的500mL发酵液添加1 500g麸皮进行吸附固定化处理,得到粉剂产品1 438.6g,水分含量为7.9%,菌密度为5.7×108 cfu/g,产品得率为16.9%。考虑到喷雾工艺设备投资大,能耗多等不利因素,因此建议使用吸附固定化技术作为石油降解固态菌剂的下游处理技术。 相似文献
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《资源开发与市场》2017,(4)
利用麻疯树油脂及其叶乙醇提取物作为原料,采用正交试验方法,考察氢氧化钠浓度、皂化温度、搅拌时间对皂基总游离碱含量的影响,确定最佳皂化条件,并制得含有和不含有麻疯树叶乙醇提取物的两种皂基。配制浓度梯度为10mg/mL、15mg/mL、20mg/mL、30mg/mL的皂液,利用滤纸片法考察这两种皂基对金黄色葡萄球菌、大肠杆菌、白色念珠菌的抑菌效果。以配制浓度为50mg/mL的皂液进行家兔皮肤刺激性试验,考察对皮肤的刺激效果。结果显示:氢氧化钠浓度为12%、皂化温度为40℃、搅拌时间为15min时的条件最佳,且总游离碱含量最低为0.30%。两种皂液对白色念珠菌无抑菌效果,对金黄色葡萄球菌和大肠杆菌有明显的抑菌效果。随着浓度增加,抑菌效果呈现增强的趋势,有无麻疯树叶乙醇提取物在抑菌效果上没有明显差异。皮肤刺激性试验表明,这两种皂液对家兔皮肤有轻微刺激性,但含有麻疯树叶乙醇提取物的皂液对家兔皮肤刺激性较弱。 相似文献
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壳聚糖对小麦发芽及生根效应的研究 总被引:1,自引:0,他引:1
利用壳聚糖浸泡小麦种子,通过考察小麦的出芽率、发芽指数、活力指数、生根数量和根的长度等各项指标的变化,探讨壳聚糖对小麦发芽和生根生理效应的影响.结果表明,当pH值6.5、壳聚糖浓度为4-6mg/mL时能显著提高小麦种子活力,促进幼苗生长;当壳聚糖浓度低于8mg/mL时,小麦的出芽率、发芽指数、活力指数随壳聚糖处理浓度的增大而明显提高;当壳聚糖浓度为4mg/mL、浸泡时间为10h时,小麦种子生根效应最为明显. 相似文献
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Trametes versicolor decolorized 2000 mg L(-1) of the mono-azo substituted naphthalenic dye Amaranth with no dye sorption observed visually. The changes in the toxicity were assessed over a period of 30 d for the dye-treated viable culture, control (no dye added), and a boiled culture treated with dye, using the Microtox Acute Toxicity assay. Before dye addition, the culture filtrate had some toxicity, which increased after the dye addition. The toxicity of the dye-treated culture decreased during the treatment. The loss of toxicity occurred at the same time, with the loss of color suggesting that detoxification is associated with decoloration. The change in pH was due to natural metabolic processes and had a small effect on detoxification. Because the toxicity of the treatment was similar to that of the control at the end of the treatment, the effluent seems to be safe for release into the environment, potentially rendering this treatment suitable for industrial application. 相似文献
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城镇化是推动我国经济社会发展的重要动力,在高速发展的同时,带来大量污染排放,威胁乡村环境质量与可持续发展。在对乡村生态环境问题剖析的基础上,从战略、实施、方式等层面探索解决思路,围绕科学规划、发展方式、基础建设、管理机制、宣传教育等方面分析关键点,加强乡村环境保护,保障城镇化建设健康发展,为促进农村农业持续发展提供持久动力。 相似文献
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泵站树状给水管网流量具有随机性,而这种随机性变化会直接影响管网的建设费用和动力费用.针对这-特点,应用随机规划原理,建立泵站树状给水管网机会约束模型,编写基于随机模拟的遗传算法程序求解该模型.机会约束模型能较客观地反映该管网的实际工况,使优化设计结果更符合实际. 相似文献
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Günay Kocasoy 《Environmental management》1989,13(4):469-475
The increase in the number of tourists visiting a coast is desired by most of the countries for economic reasons. However, this increase in tourism may cause pollution of the sea. This can be only avoided by proper planning and by predicting the carrying capacity of the coast in terms of sea pollution. This is especially important for developing countries where part of the wastewater is discharged without any treatment into the sea.In the present study the beaches were classified according to their use — and consequently the amount of waste discharged into the sea — into four groups: (1) coasts that are used only for swimming and recreational purposes; (2) coasts used simultaneously for dwelling, swimming, and recreational purposes; (3) coasts along which only dwellings exist; and (4) natural and man-made harbors, i.e., coasts used as shelters. During the survey,40,320 observations were made between December 1985 and February 1988 to determine the effect of the number of tourists on seawater quality. The results obtained were analyzed by a multilinear regression program to obtain an empirical equation giving the extent of the sea pollution in terms of coliform concentration as a function of population density and some other environmental factors.The equations derived in this study enable the determination of the carrying capacity of a beach in terms of pollution as well as the expected degree of pollution corresponding to a given population density. Furthermore, it allows the prediction of the extra carrying capacity that can be obtained by improving the waste-disposal conditions. 相似文献
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阐释了信息产业专门化街区的内涵,结合对合肥市黄山路信息产业专门化街区构成要素的分类及其邻近度的分析,分别从空间结构演化、景观演化、功能演化三方面阐述了合肥市黄山路由"电子一条街"向"信息产业专门化街区"的总体演化阶段,探讨了信息产业专门化街区的未来发展趋势。 相似文献
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