共查询到20条相似文献,搜索用时 78 毫秒
1.
采用固定进水COD浓度、缩短水力停留时间的方法对水解酸化-接触氧化反应器进行启动,第14天CODCr总去除率达到88%;启动后对微生物特性进行研究,发现水解酸化段的微型动物种类比较单一,以能生活在溶氧不足且高有机浓度情况下的微生物为主,其中第1格室中好氧及兼性厌氧微生物数量最多,可达到5.2×105 CFU/mL,在后面的格室中逐渐减少至0.67×105 CFU/mL;接触氧化段沿水流方向,微生物的数量按照鞭毛虫-游泳型纤毛虫-固着型纤毛虫-轮虫的顺序出现,生物膜厚度在10~2613μm之间波动,并逐渐减小. 相似文献
2.
3.
混凝静态实验表明在最佳条件下可去除69%CODcr,随着pH值的增加,AOX去除率逐渐升高,且增加硫离子可显著提高AOX的去除率.混凝-厌氧-好氧一体化反应装置,能有效地处理纸浆含氯漂白废水,在整个反应器停留时间为15 h时,出水CODcr、BOD5、AOX分别降为203mg/l、70 mg/l和0.92 mg/l,达到造纸行业GWPB2-1999排放标准,整个系统CODcr、BOD5、AOX毒性值去除率分别达88.1%,81.0%、98.4%、92%.GC-MS实验结果表明原废水污染物是以氯代酚为主的氯代有机物,厌氧单元通过还原脱氯及酸性水解,氯代有机物得到了基本的去除,使废水的毒性、AOX大大降低.COD、BOD主要在混凝、好氧单元得到了去除.废水经好氧处理后低分子量的酸性组分和烷烃类明显增加,表明污染物得到了进一步的氧化降解. 相似文献
4.
5.
6.
《食品与发酵工业》2017,(6):27-33
研究了两级上流式厌氧污泥床(Up-flow Anaerobic Sludge Bed,UASB)反应器处理糖蜜酒精废水的效果。进水COD负荷为28 kg/(m~3·d)时,污泥中微生物活性受到一定抑制,反应器运行效果变差,但仍能稳定运行。糖蜜酒精废水经稀释后进入一级UASB反应器,一级厌氧出水直接作为二级UASB反应器的进水。试验结果表明,经过两级厌氧消化,废水的COD和硫酸根总去除率分别稳定在65%和88%左右,二级厌氧出水COD浓度为9 000 mg/L左右,硫酸根浓度为300 mg/L。一级厌氧处理对COD和硫酸根的去除贡献较大,去除率分别为45%和70%左右,产气效果也较好,日产气量达到35 L左右,甲烷含量70%左右。出水硫化物浓度随进水硫酸根浓度增加而升高,最终一级厌氧出水达到568.8 mg/L,二级厌氧出水达到720mg/L。MPB电子流所占比重随进水COD负荷提升而增大,最大为85.8%。 相似文献
7.
8.
采用ABR反应器水解酸化处理OCC造纸循环废水,研究了常温下不同进水HRT和pH值对反应器各格室水质参数的影响。研究结果表明,不同的HRT对反应器各格室pH值的影响不大,但是各格室CODCr去除率和VFA浓度因HRT不同而有不同的变化规律。在HRT为6时,反应器处于最佳的水解酸化状态,出水的BOD5/CODCr达到0.57。进水pH值对ABR的处理效果有明显影响,酸陛条件优于中性和碱性条件,反应器各格室CODCr,的去除率和VFA浓度在酸陆、中性和碱性条件下有不同的变化规律。进水pH值为6时,反应器的水解酸化效果最好,出水具有较好的可生化性。反应器微生物数量在从前到后各格室依次递减,且原生动物以游泳型纤毛虫为主,最常见的是表壳圆壳虫,其次是草履虫和扭头虫。 相似文献
9.
10.
造纸废水的混凝-水解-接触氧化处理技术 总被引:3,自引:2,他引:3
研究了以混凝、厌氧酸化、生物接触氧化一体化反应器处理含氯漂折护望洋兴叹,水力停留时间为15h时,整个系统CODCr、BOD5、AOX、毒性值去除率分别达88.1%、81%、98.4%、92%。混凝单元主要去除大分子氯代有机物;厌氧单元通过还原脱氯及酸性水解,使氯代有机物得到了基本的去除;好氧单元对CODCr有较高的去除率。红外光谱的分析结果表明:废水中既有木素又有纤维素和半纤维素,虽然漂白废水厌氧处理技术不如好氧处理,但厌氧、好氧联合处理可有效地提高处理效果。 相似文献
11.
Sarah E. Braddock Clarke 《Textile》2018,16(1):62-77
Links between textiles, fashion, and architecture are examined in terms of their visual aesthetics and methods of realization. Both garments and buildings touch our everyday lives and can be seen as similar types of “outfits.” Pragmatic and expressive they provide protection and shelter while also reflecting taste and identity. As ever-new textiles and technologies are emerging, these are infiltrating both the world of fashion and that of architecture. Fashion references architecture, and architecture references fashion in human scale/proportions and harmony/balance of forms, while the correct choice of textile is crucial to their realization. Fashion is traditionally seen as being ephemeral and temporal and architecture as monumental and permanent but these notions are rapidly changing. Fashion is slowing down to embrace issues of sustainability, timelessness, and longevity while architecture is speeding up to take on aspects of flexibility, mobility, and change. It is proposed that the future will move towards a convergence that includes the bespoke where new textiles and technologies enable “outfits” to be made for wearing and for living in that are intimate and individual—tailored to suit and responsive to need. 相似文献
12.
13.
14.
Paul J. Moughan William C. Smith 《Journal of the science of food and agriculture》1984,35(11):1183-1185
Three diets containing either 45, 72 or 218 mEq kg?1 of the Na+ + K+ ? Cl? balance were each given to four male growing pigs in a 13-day metabolism trial. The dietary Na+ + K+ ? Cl? balance did not significantly influence the digestibility or metabolisability of gross energy and nitrogen or the extretion of urinary urea. 相似文献
15.
测定了0℃、25℃、50℃和75℃时新型钾离子筛的K -NH 4离子交换平衡数据,绘制出相应的离子交换等温线.结果表明:新型离子筛对钾离子的选择性高于对铵离子;随着温度的升高,离子筛对NH 4的选择性增加;50℃时新型钾离子筛的离子交换性能最好. 相似文献
16.
Because aqueous ions can influence the defluoridation of the electrocoagulation (EC) process, the effects of Ca(2+) and Mg(2+) were investigated. The behaviors and mechanisms of EC defluoridation in Ca(2+)-containing systems were different from those in Mg(2+)-containing systems. An increase in Ca(2+) concentration improved the defluoridation efficiency (ε(F)), but it could not change the optimal molar ratio of OH(-) and F(-) to Al(3+) (r(OH+F)). The highest ε(F) can usually be obtained at r(OH+F) = 3 for defluoridation. Only a small portion of Ca(2+) entered into the flocs, and Ca(2+) could not influence the mechanism of EC defluoridation. For the Mg(2+)-containing system, the optimal r(OH+F) increased with increasing Mg(2+) concentration. The optimal r(OH+F) was maintained at 3 after the Mg(2+) concentration was corrected using the obtained correction coefficient of 0.3435. About 50% to 70% of the total Mg(2+) entered into the flocs. From the XRD analysis, it was found that some Mg-Al-F layered double hydroxides (LDHs) were formed by Mg(2+), F(-), and Al(3+) during electrolysis. It is proposed for the first time that the formation of Mg-Al-F LDH is one of the mechanisms for EC defluoridation in systems containing both F(-) and Mg(2+). 相似文献
17.
18.
调查了大连市市售的9种鲜食食用菌中Cd2+和Pb2+的含量,并对其重金属污染状况和健康风险进行了评价。研究了Pb2+和Cd2+含量与食用菌菌丝体中富集量的相关性。利用积累函数的反函数推导出了食用菌生长环境中Pb2+和Cd2+的最大安全限值。结果表明,大连市市售鲜食杏鲍菇、真姬菇和滑菇水分含量在91.0%以上;市售的食用菌中Pb2+检出率是100%,平均含量为0.2819mg/kg;Cd2+在食用菌中未检出。低浓度的Pb2+和Cd2+能够促进食用菌菌丝体的生长,高浓度的Pb2+和Cd2+对食用菌生长产生抑制作用;随着Pb2+和Cd2+含量升高,累积速率逐渐变小。 相似文献
20.
李晓莲 《食品与生物技术学报》1988,7(3)
本文解决了一类商高数的Jes′manowicz猜测,即证明下列定理:设a=(n+h)~2-n~2、b=2n(n+h)、C=(n+h)+n~2,此处正整数n、h满足h~2=2n~2-1,则丢番图方程a+b~y=c~z仅有正整数解x=y=z=2。 相似文献