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1.
干渣吸附处理含磷污水的研究   总被引:1,自引:0,他引:1  
采用批量平衡法,研究了水体磷浓度、干渣粒径和温度对干渣吸附除磷效果的影响,探讨了干渣对水体中磷素的选择性吸附特征及其饱和吸附磷素后的解吸释磷现象。结果表明,溶液浓度越高,干渣吸附除磷速率越慢,效率越低。磷浓度为6和12mg·L^-1时,作用20h后,除磷效率可达90%。干渣粒径越小,除磷速率越快,效果也越好,磷浓度为12mg·L^-1,吸附平衡后,30、60和100目干渣的除磷效率分别为80%、93%和96%。温度对干渣除磷效果的影响较大,磷浓度为12mg·L^-1,25和35℃时,除磷效率可达95%,但在5℃时,除磷效率仅为75%。干渣能够选择性地吸附去除水体中的磷素,适宜作为除磷吸附剂,处理多种含磷污水。  相似文献   

2.
为探明能够协同吸附磺胺甲恶唑(Sulfamethoxazole,SMZ)和六价铬[Cr(Ⅵ)]的人工湿地基质种类,以蛭石、沸石、河砂、泥炭、水稻土、高炉渣、硅藻土、火山岩、钾长石和砾石10种基质作为吸附剂,采用批次吸附试验,研究SMZ和Cr (Ⅵ)单吸附和共吸附的吸附动力学、吸附等温线和pH响应变化。结果表明:准二级动力学模型能更好地描述SMZ和Cr (Ⅵ)在基质上的吸附过程(R2≥0.993),同时伴随体积扩散、大孔扩散和微孔扩散三个阶段(Ci>0),SMZ和Cr(Ⅵ)互相削弱了彼此的体积扩散和大孔扩散(P>0.05),降低Cr(Ⅵ)吸附量从0.51~0.97 mg·g-1至0.48~0.49 mg·g-1,但增加SMZ吸附量从0.35~0.54 mg·g-1至0.45~0.51 mg·g-1,SMZ和Cr (Ⅵ)以水稻土和火山岩动力学聚类变化较大。Freundlich模型能更好地描述SMZ和Cr (Ⅵ)(R2≥0.839)在各基质上的吸附行为,Cr (Ⅵ)对SMZ吸附以促进作用为主,SMZ对Cr (Ⅵ)吸附的影响因基质不同而存在差异,其中SMZ和Cr (Ⅵ)互相促进彼此在钾长石、高炉渣、火山岩、砾石的吸附容量,分别提升10%、10%、21%、25%和166%、71%、104%和658%,吸附等温线聚类变化较大。SMZ和Cr(Ⅵ)在各基质上的吸附量随pH递增而递减,酸性pH下泥炭和火山岩对SMZ和Cr(Ⅵ)的吸附量均高于其他基质,pH响应聚类变化较大。研究表明,钾长石、高炉渣、火山岩、砾石和泥炭有利于SMZ和Cr(Ⅵ)的协同吸附,是人工湿地控制SMZ和Cr (Ⅵ)复合污染的潜在基质。  相似文献   

3.
本文通过自然茶园采样,实验室模拟实验,研究了6个茶园土壤铝氟的吸附特征。不同茶园土壤对铝氟的吸附速率均是先快后慢,但吸附平衡时间有一定差异,铝在40min左右即可达吸附平衡,氟在50min内可达吸附平衡;不同茶园土壤对铝氟的吸附动力学过程均可以用Elovich方程和双常数方程描述。在实验浓度范围内,随吸附液氟初始浓度的增加,茶园土壤对氟的吸附量均呈上升趋势。在吸附液氟初始浓度〈5mmol·L^-1时,茶园土壤对氟的吸附量增加很快,当吸附液氟初始浓度〉5mmol·L^-1后,茶园土壤对氰的吸附量增加趋于平缓。不同茶园土壤对氟的吸附热力学特征均可用Langmuir方程、Freundlich方程和Temkin方程描述,由Langmuir方程所得茶园土壤氟的理论最大吸附量在333~1110mg·kg^-1之间。在实验浓度范围内,随吸附液铝初始浓度的增加,茶园土壤对铝的吸附量均呈显著上升趋势,但不同茶园土壤对铝的吸附量差异较小,Temkin方程可用于描述茶园土壤铝的吸附热力学特征。  相似文献   

4.
人工湿地基质磷吸附特性研究   总被引:4,自引:0,他引:4  
选取较为常见的人工湿地基质(土壤、砂、砾石),研究了它们对磷的吸附特性。结果表明,土壤对磷的吸附随着振荡时间的增加而增加;沙和砾石的的吸附量在振荡时间为8 h最大;Langmuir方程、Freundlich方程、Temkin方程都能很好地拟合人工湿地基质对磷的等温吸附数量,其中Langmuir等温式的拟合程度最好;3种基质在磷吸附上不存在竞争吸附;3种基质对磷的吸附,均随着磷浓度的增大而减慢。  相似文献   

5.
选取较为常见的人工湿地基质(土壤、砂、砾石),研究了它们对磷的吸附特性。结果表明,土壤对磷的吸附随着振荡时间的增加而增加;沙和砾石的的吸附量在振荡时间为8 h最大;Langmuir方程、Freundlich方程、Temkin方程都能很好地拟合人工湿地基质对磷的等温吸附数量,其中Langmuir等温式的拟合程度最好;3种基质在磷吸附上不存在竞争吸附;3种基质对磷的吸附,均随着磷浓度的增大而减慢。  相似文献   

6.
采用急性毒性的方法研究不同光照条件下重稀土铽(Tb)对辣根的生态毒理效应。结果表明,不同光照(除光照强度为12.0klx外)下,Tb(Ⅲ)对辣根过氧化物酶(HRP)的影响趋势大致相同。即低浓度的Tb(Ⅲ)(〈3mg·kg^-1)略微刺激HRP酶活升高(P〉0.05),高浓度时明显表现出抑制作用(P〈0.05)。但相同浓度的Tb(Ⅲ)对HRP的影响幅度不尽一致,Tb(Ⅲ)=300mg·kg^-1时,1.5、3.0、5.0、8.0、12.0klx处理的酶活分别为各光照条件下对照(CK)酶活的78.0%、59.3%、58.5%、52.9%、41.9%。说明强光下,酶活变化幅度较大。根据实验结果运用机率单位法数据处理,比较24h-EC50的大小顺序依次为12.0klx(84.2mg·kg^-1)〉8.0klx(337.2mg·kg^-1)〉5.0klx(349.6mg·kg^-1)〉3.0klx(809.2mg·kg^-1)〉1.5klx(1185.9mg·kg^-1)。表明与弱光相比,强光处理下的Tb(Ⅲ)对HRP毒性大。  相似文献   

7.
以甘蔗渣为原材料,在限氧条件下经600℃碳化制备生物炭RC,经800℃碳化制备生物炭HC,分别研究两者对Cr (Ⅵ)的吸附-还原反应。采用扫描电子显微镜-能谱(SEM-EDS)、比表面积和孔隙分析(BET)、傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)和拉曼光谱(RS)等对甘蔗渣生物炭表面性质进行表征,从吸附等温线、吸附动力学等角度探讨甘蔗渣生物炭对Cr (Ⅵ)的吸附-还原反应特征及其机理。结果表明:甘蔗渣生物炭具有丰富的孔隙结构和表面活性基团,且随着碳化温度升高,甘蔗渣生物炭表面孔隙度和芳香化程度增加,而含氧官能团OH、C O等相对含量则降低。HC对Cr (Ⅵ)的吸附-还原去除效果最好,总去除量高达117.28 mg·g-1,较RC增加了82.42 mg·g-1,其中吸附反应的去除量为76.00 mg·g-1,比RC增加了67.99 mg·g-1。随着碳化温度升高,生物炭缺陷程度降低,电子传递能力增强。HC对Cr (Ⅵ)的还原量为87.40 mg·g-1,较RC增加了57.03 mg·g-1。吸附等温线和吸附动力学拟合结果显示,甘蔗渣生物炭对Cr(Ⅵ)的吸附更符合拟二级动力学模型。Langmuir模型适用于HC对Cr(Ⅵ)的吸附,Freundlich模型适用于RC对Cr (Ⅵ)的吸附。XPS和FTIR分析结果显示,甘蔗渣生物炭对Cr (Ⅵ)的去除机理为静电吸附、还原和络合作用,其中RC、HC吸附作用的相对贡献率分别为22.98%、64.80%,还原反应的相对贡献率分别为87.12%、74.52%,表明甘蔗渣生物炭对Cr (Ⅵ)的去除过程以还原为主。  相似文献   

8.
不同人工湿地基质对磷的吸附性能研究   总被引:2,自引:0,他引:2  
通过基质磷素吸附动力学、等温吸附以及基质饱和吸附后磷素解吸实验,研究陶瓷滤料、红泥、水洗砂、炉渣4种人工湿地基质净化磷素的效果,评价其基质磷素饱和吸附后磷素解吸可能造成的二次污染风险.结果表明,在溶液磷(P)浓度为5~150 mg·L-1条件下,Langmuir和Freundlich等温吸附方程均能很好地描述陶瓷滤料和红泥两种基质的磷素吸附过程,陶瓷滤料用Langmuir方程比Freundlich方程的拟合程度更好,红泥则相反.4种基质对磷素的吸附量顺序依次为红泥>陶瓷滤料>炉渣>水洗砂.从磷素的解吸率来看,4种基质释磷顺序依次为炉渣>水洗砂>陶瓷滤料>红泥,水洗砂和炉渣吸附磷素后的解吸率较高,其他两种基质磷素解吸的比例很低.综合评价,陶瓷滤料更适合作为人工湿地污水除磷的基质.  相似文献   

9.
利用天然缩聚高分子化合物、天然非金属矿物等在一定的条件下制得改性磷铵1号,在此基础上添加二价金属碳酸盐等制得改性磷铵2号。在玉米苗期进行砂土盆栽试验以确定改性磷铵对土壤有效磷的变化、地上部分植株含磷量和生物量的影响。设3kg土+100mg·kg^-1P2O5(对照),3kg土+100mg·kg^-1P2O5(改性磷铵1号),3kg土+100mg·kg^-1P2O5(改性磷铵2号)3个处理。结果表明,改性磷铵提高了砂土有效磷含量、玉米含磷量和生物有效性,施入磷酸一铵、改性磷铵1号和2号20d的土壤有效磷含量分别为施入时的30%、35%和44%;施入改性磷铵1号玉米地上部分植株含磷量较施入磷酸一铵高1.5mg·plant^-1;施入改性磷铵2号的玉米地上部分生物量较施入磷酸一铵高1.6g·pot^-1。  相似文献   

10.
采用药膜法测定了3个家蝇(Musca domestica L.)种群对12种有机磷和氨基甲酸酯类杀虫剂的敏感性,采用酶动力学方法测定了不同杀虫剂对家蝇乙酰胆碱酯酶(acetylcholinesterase,AChE)的体外抑制作用。结果表明,Org种群对抗蚜威(LC50=18.654mg·L^-1)、速灭威(LC50=17.387mg·L^-1)比FAAS种群(LC50分别为26.011、26.632mg·L^-1)更为敏感,FAAS种群对仲丁威(LC50=8.271mg·L^-1)比Org种群(LC50=12.539mg·L^-1)更为敏感;除了与乙酰甲胺磷无显著差异外,FZ种群对其他供试杀虫剂的敏感性均显著低于Org种群和FAAS种群(95%CI没有重叠)。Org种群AChE对二嗪磷(IC50=0.025mg·L^-1)比FAAS种群AChE(IC50=0.048mg·L^-1)更为敏感,FAAS种群AChE对辛硫磷(IC50=0.021mg·L^-1)比Org种群AChE(IC50=0.026mg·L^-1)更为敏感;FZ种群AChE对所有供试杀虫剂的敏感性均显著低于Org种群和FAAS种群AChE(95%CI没有重叠)。  相似文献   

11.
Web2.0,以个人为中心的互联网时代的到来   总被引:15,自引:0,他引:15  
本文介绍了Web2.0的知识和背景,对Web2.0出现的基础以及典型技术和应用作了阐述,同时对其作出了前景展望。  相似文献   

12.
The present study has been performed to understand the location of the virus, type of apoptotic cells, and their relation to lymph nodes of piglets infected with porcine circovirus type Ⅱ (PCV-2). Nine 32-day-old conventional piglets free of infection with PCV-2 were used, and distributed into three groups: control group (n = 3), piglets inoculated with PCV-2 alone (PCV-2, n = 3), and PCV-2 inoculated and KLH immunostimulated group (PCV-2 + KLH, n = 3). Superficial inguinal lymph nodes from all piglets were collected for histological examination after 32 days postinoculation, and immunohistochemistry for PCV-2 detection. Location of apoptotic cells was detected with TdT-mediated dUTP nick end labeling (TUNEL) and cell cycle, and the apoptotic rates were measured by flow cytometry. The characteristic histopathological lesions of the piglets in PCV-2 and PCV-2 + KLH were lymphocyte depletions in the cortex and paracortex of the lymph nodes, epithelioid-like macrophage infiltration, and intracytoplasmic inclusion bodies presented in epithelioid-like macrophages. PCV-2 was mainly found in epithelioid-like macrophages by immunohistochemistry. In the lymph nodes, lymphocytes presented higher apoptotic rates in the cortex by TUNEL, special B-cell areas, and similar apoptotic cells were found in this compartment in the control. The apoptotic rates of the lymph nodes were 0.41, 3.34, and 4.88% in the control, PCV-2, and PCV-2 + KLH groups by flow cytometry, respectively. The apoptotic rates of lymph nodes for PCV-2 and PCV-2 + KLH piglets were significantly higher than those for the control group (P〈0.05 and P〈0.01). The proliferation index (PI) was 0.17_+0.01, 0.12_+0.01 and 0.12_+0.04 in the control, PCV-2, and PCV-2 + KLH group, the PI of the control group was higher than that of the other groups, but without the statistical difference. PCV-2 can induce lymphocyte depletion in lymph nodes of piglets by blocking cell proliferation and promoting apoptosis. This is one o  相似文献   

13.
迟贵富  张昱  李亮  钟子琳 《安徽农业科学》2009,37(12):5585-5587
以抚顺地区3个国家基本站50余年气象资料为依托,采用Microsoft Excel工作表实现由气候和农业气候2部分构成的气象与农业综合信息处理系统的基本思路、方法、内容、用途和使用情况。为了实现气候分析及应用的科学化、客观化、系统化、规范化、程序化及连续化的业务目标,按业务流程设计与实现的,包括资料处理、气候趋势模拟、气候预测、气候鉴定、季节性信息化处理、农作物产量预报、气候生产潜力分析等一系列内容在内的系统建设。关键是解决了大量的计算问题,建立了区域性通用模式。  相似文献   

14.
Urban water consumption has some characteristics of grey because it is influenced by economy, population, standard of living and so on. The multi-variable grey model (MGM(1,n)), as the expansion and complement of GM(1,1) model, reveals the relationship between restriction and stimulation among variables, and the genetic algorithm has the whole optimal and parallel characteristics. In this paper, the parameter q of MGM(1,n) model was optimized, and a multi-variable grey model (MGM(1 ,n,q)) was built by using the genetic algorithm. The model was validated by examining the urban water consumption from 1990 to 2003 in Dalian City. The result indicated that the multi-variable grey model (MGM(1,n,q)) based on genetic algorithm was better than MGM(1,n) model, and the MGM(1,n) model was better than MGM(1,1) model.  相似文献   

15.
Campylobacter species are a major cause of foodborne bacterial infections in both developed and developing countries worldwide. Campylobacter jejuni is responsible for the majority of infections. This study was conducted to identify virulenceassociated genes in Campylobacter species isolated from livestock production systems in South Africa. A total of 250 fecal samples consisting of cattle(n=50), chickens(n=50), goats(n=50), sheep(n=50) and pigs(n=50) were randomly collected from livestock in Eastern Cape and KwaZulu-Natal provinces of South Africa between April and October 2018. The samples were analyzed for the presence of virulence genes in Campylobacter species using molecular PCR-based methods. It was found that 77 and 23% of Campylobacter jejuni and Campylobacter coli respectively were isolated from all the livestock samples. There were positive significant(P0.05) correlations amongst all the virulence genes that were investigated. Chisquare and Fisher's exact tests were implemented to test for the effect of livestock species on the presence or absence of virulence genes. The study demonstrated that most of livestock species can potentially cause zoonotic infections and food poisoning due to the high prevalence of Campylobacter. The high prevalence of virulence genes highlights the significance of Campylobacter in livestock production systems in South Africa. This requires the implementation of one-health approaches to reduce the impact of foodborne and zoonotic diseases for the welfare of human and animal health.  相似文献   

16.
不同施肥水平对木薯氮磷钾养分积累、分配及其产量的影响   总被引:13,自引:0,他引:13  
 【目的】通过比较不同施肥水平下木薯氮磷钾养分积累、分配和产量的差异,探讨粤北坡岗地优质高产木薯氮磷钾养分的最佳用量。【方法】以木薯品种南美119为材料,采用“3414”方案,在粤北翁源进行大田试验。试验共设14个处理。【结果】施肥处理的氮素主要分配到地上部,不施肥处理的氮素则主要分配到根部;不同施肥处理的磷素均主要分配到地上部;不施肥处理和不施钾处理的钾素主要分配到根部,不施氮处理的钾素在根、冠间分配较均衡。在木薯不同生长阶段,植株氮磷钾含量均呈下降趋势,但施氮、磷、钾化学肥料处理植株氮磷钾含量的下降速度小于不施氮、磷、钾化学肥料的处理。处理N2P2K2的氮、磷、钾含量和积累量在各生育期均为最大,不施肥处理(N0P0K0)的氮、磷、钾含量和积累量在各生育期均为最小(P<0.05)。产量最高的是N2P3K2处理,为22 694.06 kg·hm-2,其次是N2P2K2处理,为21 417.87 kg·hm-2。【结论】木薯产量、氮磷钾养分积累及其在根冠间的分配,对施肥水平高度敏感, 适当比例的氮磷钾肥配合施用既可以显著增加木薯植株的氮磷钾含量和积累量,又可以提高产量。在粤北坡岗地木薯生产中,氮素最重要,在氮素得到满足的条件下,磷素较钾素更重要。在本试验条件下,氮磷钾养分最佳用量为358.80 kgN·hm-2、89.10 kg P2O5·hm-2和187.50 kg K2O·hm-2。  相似文献   

17.
选体重约38公斤的长白(♂)×成华(♀)杂交猪20头,随机分为四组,饲予四种不同的饲粮,研究饲粮中添加铜和/或喹乙醇对猪生产性能和某些血液生化指标的影响。结果表明:基础组、加铜组、加喹乙醇组和两者同时加组全期日增重分别为674、761、796、678克,日采食量分别为2.50、2.65、2.74、2.40公斤,饲料利用率分别为3.73、3.49,3.44、3.54,添加铜和/或喹乙醇对试验第65天血清铜兰蛋白、尿素氨及屠宰率、背膘厚和眼肌面积无显著影响(p>0.05);添加铜使65天血清碱性碱酸酶活性极显著增高(p<0.01),添加喹乙醇有使之升高的趋势,两者同时添加时,碱性酸磷酶活性降低。  相似文献   

18.
Analysis of genetic interactions between rice and its pathogenic fungi Magnaporthe oryzae and Rhizoctonia solani should lead to a better understanding of molecular mechanisms of host resistance, and the improvement of strategies to manage rice blast and sheath blight diseases. Currently, dozens of rice resistance (R) genes against specific races of the blast fungus have been described. Among them, ten were molecularly characterized and some were widely used for breeding for genetic resistance. The Pi-ta gene was one of the best characterized rice R genes. Following the elucidation of its molecular structure, interaction, distribution, and evolution, user friendly DNA markers were developed from portions of the cloned genes to facilitate the incorporations of the Pi-ta mediated resistance into improved rice varieties using marker assisted selection (MAS). However, rice blast is still a major threat for stable rice production because of race change mutations occurring in rice fields, which often overcome added resistance based on single R genes, and these virulent races of M. oryzae pose a continued challenge for blast control. For sheath blight, progress has been made on the exploration of novel sources of resistance from wild rice relatives and indica rice cultivars. A major quantitative trait locus (QTL), named qSB9-2, was recently verified in several mapping populations with different phenotyping methods, including greenhouse methods. The ability to identify qSB9-2 using greenhouse methods should accelerate the efforts on the qSB9-2 fine mapping and positional cloning.  相似文献   

19.
以仙人掌为试验材料,采用硫酸铵分级沉淀法得到超氧化物歧化酶(Superoxide Dismutase,SOD)粗酶液。然后用Sephadex(葡聚糖凝胶)G-75层析柱层析对粗酶液进行进一步纯化,最后用邻苯三酚法测定酶活力,并对酶活力主要影响因素(包括pH值、温度、抑制剂)进行了研究。结果显示仙人掌SOD酶比活力为751.56U.mg-1。pH值为7.5~8.5时酶活力最大,稳定性也好。温度维持在25~30℃时酶活力最高。由于过氧化氢和氰化钾均能使仙人掌SOD的酶活力显著下降,因而可以初步判断从仙人掌中提取到的SOD是Cu.Zn-SOD。  相似文献   

20.
郁达  王立新  郁建锋  杨珍  杜兰芳 《安徽农业科学》2010,38(32):18300-18302
以豌豆为试验材料,采用水培方法研究了锌对镉、汞复合污染下的豌豆种子萌发与生长的影响。结果显示,锌浓度≤100.0 mg/L时促进豌豆种子的萌发,锌浓度为200.0和300.0 mg/L时抑制豌豆种子的萌发。当镉、汞的浓度为3.0 mg/L时,100.0 mg/L锌的解毒效应最明显,表现为能够促进镉、汞胁迫下豌豆种子萌发和幼苗生长,降低豌豆幼苗根尖细胞畸变率,提高豌豆幼苗的叶绿素含量及过氧化物酶活性;但当锌浓度≥200.0 mg/L时,与镉、汞协同迫害豌豆幼苗的生长。  相似文献   

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