共查询到18条相似文献,搜索用时 140 毫秒
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《新疆环境保护》2020,(1)
以没食子药渣为原料,采用限氧热解法制备了不同温度300℃、400℃、500℃、600℃下的药渣生物炭,考察pH、投加量、溶液温度、不同接触时间和溶液初始浓度对吸附苯酚的影响。实验结果表明,这几个因素均能影响生物炭对苯酚的吸附效果。4种不同热解温度制备的生物炭对苯酚的吸附能力为400℃500℃600℃300℃,300℃和400℃最佳pH为5.0,500℃~600℃的最佳pH为7.0,药渣生物炭吸附苯酚的最佳投加量为0.05 g。在25℃~45℃条件下,较高的温度有利于药渣生物炭对苯酚溶液的吸附。没食子药渣生物炭的吸附过程先快后慢,在10 h趋于平衡。利用Langmuir和Freundlich模型对4种生物炭进行拟合,发现不同热解温度的药渣生物炭基本符合Langmuir和Freundlich等温吸附模型。研究结果为预测药渣生物炭吸附重金属提供理论参考,从而为拓展药渣资源化利用提供有效途径。 相似文献
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对城市污水处理厂污泥中重金属来源、危害及处置进行讨论。采用火焰原子吸收法及原子荧光法对某城市污水处理厂污泥中重金属进行测定,结果表明:Zn、Pb、Cr、Hg含量均符合我国《城镇污水处理厂污染物排放标准》污泥农用控制标准,Cd、Cu含量略高于该标准;依据重金属元素在污泥中的主要存在形态,讨论了污泥排放对环境的潜在风险;提出固定或沥滤处理可用于污泥处置,固定处理法相对经济,操作简便,更易推广。 相似文献
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城市污水厂在污水处理过程中产生大量污泥物质。其BOD5数量远超过尾水排放的BOD5数量,是后者的数倍之多。目前城市污水厂寻找生污泥直接外运的出路日益困难,污泥出路不畅,经常出现泥满为患的现象。本文探讨延伸城市污水处理厂的职能,使污泥的“生产者”承担起污泥处理和处置的环境责任,激励其全面关注进水有机物的最终无害化,将污泥处理以及最终处置(如土地填埋、焚烧或资源化等)的工程造价、运行费用以及相应的环境影响均纳入城市污水处理厂进行考虑,这样将对我国城市污水厂的环境管理观念带来革命性的变化。 相似文献
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化学活化法制备麻疯树果壳活性炭的实验研究 总被引:1,自引:0,他引:1
以麻疯树果壳为原料,KOH为活化剂,通过化学活化法制备活性炭。考察了反应温度、反应时间和碱炭比(KOH与麻疯树果壳炭化料的质量比)等因素对活化结果的影响,并利用N2吸附和BET等现代分析测试方法来表征活性炭的结构特征。结果表明,化学活化法制备的活性炭吸附剂性能较好,且当活化温度为850℃,活化时间为240min,碱炭比R=4时制得活性炭产品的质量最好;化学活化法制备的活性炭为微孔吸附剂,在最佳条件下得到最大的碘吸附值和比表面积分别为2218.44mg/g和1890m^2/g。 相似文献
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Kenneth D. Schmidt 《Journal of the American Water Resources Association》1975,11(3):514-525
ABSTRACT: Sewage effluent is commonly disposed of on land in arid regions, and the majority usually recharges the groundwater. Few evaluations have been made of the effect of effluent disposal on groundwater quality in the west. Groundwater hydrologists are rarely involved with treatment plant design and operation or effluent disposal in the San Joaquin Valley, California. The author's purpose is to evaluate the effect of regional sewering programs on groundwater quality in this valley. Research was conducted on past studies of sewage effluent disposal. An extensive water sampling program was undertaken near the Fresno Sewage Treatment Plant. Chloride contents were used to trace recharged effluent. The extent of recharged effluent was delineated and traced for about ten miles. Sampling between the plant and the urban Fresno area indicated a high probability of large-scale leakage of raw sewage into the groundwater. 相似文献
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从荷兰、德国的实践看污泥的能源回收利用——浅议污水厂的污泥处理 总被引:1,自引:0,他引:1
进入21世纪后,随着城市发展和环境污染的加剧,我国城镇污水处理厂的建设开始加速发展。至2010年,城市污水处理率约为70%,随着大量污水处理厂投入运行,污泥处置问题已经迫在眉睫。本文介绍了荷兰污泥处理的发展历程和方法,以SNB污泥处理中心、慕尼黑Gut Groβlappen污泥处理厂为实例介绍了集中式污泥处理及能源利用。我们认为,荷兰、德国污泥处理的经验和方法对我国的污泥处理具有借鉴价值。 相似文献
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The rise in aluminium demand in the world has significantly increased the generation of bauxite residue which occupies huge areas of land worldwide. Direct revegetation of residue storage areas has been unsuccessful because of the high alkalinity and salinity, and poor nutrient contents of the fine residue (red mud). This paper describes glasshouse and field experiments evaluating the potential use of sewage sludge as an organic ameliorant for gypsum amended red mud. The growth of Agropyron elongatum in red mud receiving gypsum (0 and 38.5 t ha−1) and sewage sludge (0, 38.5 and 77 t ha−1) amendment was assessed in a glasshouse study. Leachate and soil analyses revealed that gypsum was effective in reducing the pH, EC and ESP of red mud, while sewage sludge gave additional reductions in EC, Na and ESP. No evidence of any significant increases in heavy metal contents were observed in the leachates following sewage sludge amendment. However, soil Al contents were more available in red mud receiving only sewage sludge treatment. Sewage sludge amendment significantly increased dry weight yield and provided sufficient nutrients for plant growth except K which was marginal. No heavy metal accumulation was observed in Agropyron. Following that, a field experiment was performed having red mud amended with sewage sludge (38.5, 77 and 154 t ha−1) and gypsum (38.5 and 77 t ha−1) to evaluate their effects on soil physical properties of red mud. Sewage sludge significantly reduced soil bulk density (25%) and particle density (9%) and increased the total porosity of red mud (8%). Hydraulic conductivity also increased from 1.5 to 23 × 10−5 m s−1. Plant cover percentage and dry weight yield of Agropyron increased with an increase in gypsum and sewage sludge amendment. The results confirm that sewage sludge is effective in improving both soil structure and nutrient status of gypsum amended red mud. The use of sewage sludge for red mud revegetation provides not just an option for sludge disposal, but also a cost effective revegetation strategy for bauxite refining industry. 相似文献