共查询到20条相似文献，搜索用时 46 毫秒
1.
Bioflocculants have received increasing attention in research because they are low cost, non-toxic, biodegradable, operationally simple and useful in many water and wastewater treatment applications. In this study, we focused mainly on the screening of the flocculant-producing strain and its application in oily wastewater treatment. Bacteria strain B-6-1 was isolated by the pyridine screening method. UPC-1 reagent produced by B-6-1 had efficient flocculating activity. It was deduced that the main component of UPC-1 reagent was polysaccharide through purification and analysis. The influence of dosage of reagent, pH value, temperature and oil concentration on the flocculation effect of UPC-1 reagent was investigated. 相似文献
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李锐 《兰州石化职业技术学院学报》2014,(4):8-10
通过正交实验和单因素实验探索了Fenton氧化炼化废水中苯酚的最佳工艺条件。实验结果表明,Fenton试剂处理苯酚废水时,各影响因素的作用大小顺序是:p H反应温度H2O2投加量反应时间Fe SO4·7H2O投加量;最佳氧化反应条件为:p H=3.5,反应温度为20℃,H2O2投加量为12 m L·L-1,反应时间为30min,Fe SO4·7H2O投加量为450 mg·L-1,此时废水中苯酚的去除率为89.26%,残余苯酚含量为11.76 mg·L-1。因此,用Fenton氧化法处理含苯酚废水是一种非常有效的方法。 相似文献
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采用Fenton法处理弱酸艳红B染色废水。通过单因素实验和正交实验,研究反应温度、初始pH值、H2O2和FeSO4投加量及反应时间对色度和COD去除率的影响。结果表明,各因素对COD去除率的影响从大到小依次为：反应温度〉pH值〉H2O2投加量〉FeSO4投加量。而处理废水的最佳条件为：反应温度50℃、初始pH值为2．5、30％H2O2投加量为5mL／L、FeSO4投加量为500mg／L、反应时间为90min。在此条件下,废水色度去除率为99．0％,COD去除率为74．2％。 相似文献
4.
中医临床文献与中医教学、科研、临床密切相关,包括与中医临床疾病的诊断、治疗有关的文献内容.系统深入地对中医临床文献进行整理研究,有利于提高中医教学、科研和临床学术水平.认为：中医病证名称整理是前提和关键,在此基础上,界定文献检索和收集的范围,综合运用目录学、版本学、训诂学等文献学的方法系统整理相关文献,建立重点病种文献数据库,进行数据分析挖掘研究,加强重点病种理论研究,最后形成重点病种中医临床综合防治方案. 相似文献
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Gao J Bao HY Xin MX Liu YX Li Q Zhang YF 《Journal of Zhejiang University. Science. B》2006,7(3):186-192
INTRODUCTION Bioflocculation is a dynamic process resulting from the synthesis of extracellular polymer by living cells. Since flocculation in microbial system was first reported by Louis Pasteur (Salehizadeh and Sho-jaosadati, 2001), bioflocculation has been investi-gated extensively and a correlation was established between the accumulation of extracellular biofloccu-lants and cell aggregation (Tenney and Verhoff, 1973). Bioflocculants are essentially polymers pro-duced by microorgan… 相似文献
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何锦强 《广东轻工职业技术学院学报》2009,8(3):17-20
采用三维电极/Fenton试剂/中和法对广东某包装厂高浓度油漆废水进行处理,实验结果表明：油漆废水通过铁板三维电极在电压18V、极板间距4cm、pH自然和电解3h条件下,COD去除率达67.1%;电解水在H2O2投加量为13mL/L（30%）、Fe^2＋投加量为40mL/L（10%）、反应时间为3h时,COD为109mg/L;将处理水pH调至6-9,出水COD可降至100mg/L以下,达到国家《污水综合排放标准》（GB8978-1996）二级排放标准。 相似文献
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通过甲基橙模拟染料废水,考察了电-Fenton法处理染料废水的效果。通过单因素分析和正交实验得出:在电解时间为100min,电解质投加量为16g/L,pH值为2,电压为14V的条件下,COD的去除率达到80%以上,色度去除率可达99%。此方法具有高效、去除效果好、经济适用等优点,在染料废水的处理领域具有广阔的应用前景。 相似文献
9.
利用造纸厂废水污泥制备活性炭 总被引：1，自引：0，他引：1
赵素青 《南阳师范学院学报》2013,12(6):24-27
以造纸废水处理厂污泥为主要原料,采用化学活化法制备活性炭,考查了活化剂的浓度、活化温度、活化时间、固液比等方面对污泥吸附性能的影响.结果表明:在氯化锌溶液为40%、活化温度为600℃、活化时间为15 min、固液比为1∶3的最佳条件下制备的污泥活性炭碘值达到320 mg·g-1,而加入10%的茶梗添加剂制备的活性炭碘值可达503 mg·g-1,因此引入添加剂可以改善污泥活性炭的吸附性能.利用该污泥活性炭处理含苯酚废水,具有较好的处理效果,因此加强开发并推广污泥制备活性炭新技术,实现废水污泥的资源化利用,成为处理剩余污泥的一种有效途径. 相似文献
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INTRODUCTION Nitrogen oxide (NOx) is one of the main air pol- lutants found in the flue gases from chemical and power plants belching acid rain and photochemical smog. Over 90 percent of all man-made nitrogen ox- ides that enter our atmosphere are produced by the combustion of various fuels. Compared with the ad- vanced stage of SO2 gas removal technologies devel- opment, the removal of NOx gases is still in the initial stages of development as roughly 90 to 95 percent of NOx emitted i… 相似文献
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Fenton试剂脱除模拟印染废水色度的研究 总被引：2，自引：0，他引：2
张永利 《韩山师范学院学报》2008,29(6)
以亚甲蓝水溶液做模拟印染废水,采用Fenton试剂氧化法对其进行处理,以水样吸光度作为评价指标,利用单因素优化及正交实验法,对Fenton试剂用量、反应时间和入水pH进行了系统的研究．实验结果表明,Fenton试剂氧化脱除模拟印染废水色度的效果明显,水样脱色率达到99％以上;随着Fenton试剂用量的增加以及反应时间的延长,水样色度去除率提高,适宜的Fenton试剂用量及反应时间分别为5mL试剂／25mL水样、30min;入水pH存在适宜值4,在入水pH由4降低N3和由4升高到6的过程中,水样色度去除呈现降低的趋势;Fenton试剂氧化模拟印染废水中,3因素影响大小顺序为：反应时间〉Fenton试剂用量〉入水pH． 相似文献
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通过控制化学试剂的酸、碱环境,控制浓度、温度,控制氧化、分解,选择溶剂和选择配制化学试剂的方法,配制出符合化学实验要求的化学试剂。 相似文献
13.
Haimanot Habte Lemji Hartmut Eckstädt 《Journal of Zhejiang University. Science. B》2013,14(10):924-933
Evaluating the performance of a biotrickling filter for the treatment of wastewaters produced by a company manufacturing beer was the aim of this study. A pilot scale trickling filter filled with gravel was used as the experimental biofilter. Pilot scale plant experiments were made to evaluate the performance of the trickling filter aerobic and anaerobic biofilm systems for removal of chemical oxygen demand (COD) and nutrients from synthetic brewery wastewater. Performance evaluation data of the trickling filter were generated under different experimental conditions. The trickling filter had an average efficiency of (86.81±6.95)% as the hydraulic loading rate increased from 4.0 to 6.4 m3/(m2·d). Various COD concentrations were used to adjust organic loading rates from 1.5 to 4.5 kg COD/(m3·d). An average COD removal efficiency of (85.10±6.40)% was achieved in all wastewater concentrations at a hydraulic loading of 6.4 m3/(m2·d). The results lead to a design organic load of 1.5 kg COD/(m3·d) to reach an effluent COD in the range of 50–120 mg/L. As can be concluded from the results of this study, organic substances in brewery wastewater can be handled in a cost-effective and environmentally friendly manner using the gravel-filled trickling filter. 相似文献
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In wireless networks, data packets are lost due to channel interference and fading rather than network congestion. Thus, TCP designed for wired networks, cannot achieve a satisfying performance in wireless networks. Utilizing a cross-layer mechanism to identify the course of packet loss, we have proved that a mobile-host-centric transport protocol (MCP) can achieve higher throughput than TCP Reno and New Reno in static wireless environment. In this paper, we extend the cross-layer feedback mechanism and con... 相似文献
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研究采用机械力化学辅助作用下制备高吸附性能木质活性炭,探讨了研磨时间、浸渍比（磷酸与绝干杉木屑的质量之比,下同）、磷酸浓度对所制备活性炭的碘吸附值和亚甲基蓝吸附值的影响;同时,采用比表面积及孔隙分析仪和傅立叶红外光谱仪（FT-IR）对活性炭的表面官能团、比表面积、孔容及孔径分布等进行了表征.分析显示：经过机械力化学辅助作用处理后,机械力化学激活作用有利于木屑与磷酸之间发生更多的化学反应,同时促进更多纤维素发生热解;此外,机械力化学辅助作用可能降低了纤维素热解过程中聚合及芳构化阶段的温度;通过N2吸附等温线分析表明机械力化学法所制备活性炭具有丰富的微孔结构. 相似文献
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A lagoon in the New Binhai District, a high-speed developing area, Tianjin, China, has long been receiving the mixed chemical
industrial wastewater from a chemical industrial park. This lagoon contained complex hazardous substances such as heavy metals
and accumulative pollutants which stayed over time with a poor biodegradability. According to the characteristics of wastewater
in the lagoon, the micro-electrolysis process was applied to improve the biodegradability before the bioprocess treatment.
By the orthogonal experimental study of main factors influencing the efficiency of the treatment method, the best control
parameters were obtained, including pH=2.0, a volume ratio of Fe and reaction wastewater of 0.03750, a volume ratio of Fe
and the granular activated carbon (GAC) of 2.0, a mixing speed of 200 r/min, and a hydraulic retention time (HRT) of 1.5 h.
In the meantime, the removal rate of chemical oxygen demand (COD) was up to 64.6%, and NH4
+-N and Pb in the influent were partly removed. After the micro-electrolysis process, the ratio of biochemical oxygen demand
(BOD) to COD (B/C ratio) was greater than 0.6, thus providing a favorable basis for bioprocess treatment. 相似文献
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以水解度为优化指标,利用单因素试验考察酶解温度、pH值、时间等因素对鱼蛋白水解的影响,利用中心组合试验方法优化酶的添加量和蛋白质浓度．结果表明,复合蛋白酶水解蓝圆够的最佳工艺条件为：加酶量2700U·g^-1蛋白、蛋白质浓度1．56％、水解温度60℃、反应体系pH7．5、反应时间8h．在此条件下,水解体系的氨基酸态氮含量达1．27mg·mL^-1,水解度为50．98％,挥发性盐基氮含量为0．032mg·mL^-1。 相似文献
19.
卫艳新 《安徽教育学院学报》2008,26(6)
以钛白粉厂副产物为原料制备高效复合絮凝剂聚合氯硫酸铁(PFSC),对其进行了废水处理实验,考查了废水的pH值、絮凝剂用量、沉降时间等对絮凝性能的影响,确定了PFSC絮凝剂处理废水的最佳条件.对比实验结果表明:PFSC的絮凝效果和絮凝沉降性能均比PFS和PAC好,处理废水的效果更佳. 相似文献
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选取吸附法为处理方法,以锯末为吸附剂,用氢氧化钾溶液加以活化,一定条件下对含镉废水进行处理,用结晶紫分光光度法测定溶液中镉的含量,分析含镉废水中镉的去除率,以研究锯末吸附镉的最佳实验条件.实验证明:改性锯末对低浓度的含镉废水有较好的处理效果,最佳反应温度为30℃,最佳反应时间为100min. 相似文献