苹果茎沟病毒对梨树幼苗生长及过氧化物酶活性的影响

Based on growth level and peroxidase activity, a comparative study and paried-samples t test were made between vires-free Zaosu pear seedlings and the seedlings inoculated with apple stem grooving virus(ASGV). The results showed : ( 1 )virus-free Zaosu pear seedlings grew better than inoculated ones. Of the seedlings the height, diameter, branches and autumn braches differed statistically significantly; (2)the peroxidase activity of inoculated seedlings was higher than that of virus-free ones, and the peak of peroxidase activity occurred on about d 7 and d 24 after inoculation. Fig 1, Tab 1, Ref 9     

好山好水好寄情

上海作家陈村写了一篇《想象上海》,他说,最最令人不安的是上海虽是个海边城市,但它没有海的景观,也没有像样的山,这块土地平坦得太过份了。作家要平地垒一座山。他想象,山垒在金山卫,更好是在宝山口。有一座高高的山,居高临下地看江看海,可以吟诗。对面是崇明岛,正好去看候鸟和芦苇,去打滚,去放歌,去晒太阳……这使我想到中国的风景画来。一幅风景画有山有水,方成佳妙。一个城市也如此,要想真美,无山便难了。北京若无西山,南京若无钟山,广州若无越秀山,那简直不可想象。就连武汉,尽     

卡鲁塞尔氧化沟在中段废水处理中的应用

1999年6月山东（临清）银河纸业集团投入运行的中段废水处理工程,是继100t/d麦草浆碱回收之后的又一环保工程。该工程占地5.5万m2,总投资4800万元,日处理中段废水5万m3,采用物化一生化处理工艺,所选用的主要设备具有国际先进水平,其中以卡鲁塞尔生物氧化沟为代表的几种处理设备,均为国外专利技术设备。     

导流墙偏置位置对氧化沟性能影响的分析

针对偏置导流墙氧化沟复杂结构的特点,采用计算流体力学数值模型和Fluent计算方法,将导流墙偏置距沿径向从0至1m,间隔0.25m进行偏置距位置变化,对氧化沟流场进行了数值计算模拟。研究结果表明:导流墙的偏置距设置对改善隔墙背后的水流低速区和消除污泥沉积有促进作用,但当导流墙的偏置距增加到一定值时,在隔墙背后径向半宽处会形成第二个水流低速区。在比较不同导流墙偏置距的速度曲线基础上,认为导流墙的偏置距应设置在0.3m～0.4m之间较合适,从而为偏置导流墙的合理设计提供理论依据。     

改良型氧化沟工艺+深度治理技术处理城市污水

以漯河市沙南城市污水处理厂为例,简要介绍了改良型氧化沟在处理城市污水中的工艺原理及运行特点,分析了其运行情况及效果,结果表明：主要出水指标CODCr,BOD5,SS,NH4＋-N,TN,TP的去除率分别为92.62%,95.51%,97.82%,90.53%,72.95%,95.67%。出水水质完全达到了GB18918—2002《城镇污水处理厂污染物排放标准》表1一级标准A标准和中水回用要求。     

鼓风曝气氧化沟工艺在中小城镇污水处理应用中的优越性

通过分析中小城镇污水处理的现状与存在问题和鼓风曝气氧化沟工艺的工作原理与优点,论证了该工艺在中小城镇污水处理应用中的优越性.     

污水处理厂电耗分析与控制

通过对焦作污水处理厂处理工艺特点的研究,分析了其电耗的组成和重点,提出了主要耗电环节的节电措施．每月节约电费12万元。     

脱氮除磷污水处理厂的运行控制

本文结合工程实例,针对脱氮除磷污水处理厂的运行问题进行了探讨,优化了氧化沟的工艺参数,提高了氧化沟的处理效果,改善了二沉池出水水质:CODCr≤50mg/L,BOD5≤10mg/L,NH4-N≤5mg/L,TN≤15mg/L,TP≤0.5mg/L。     

Removal of airborne microorganisms emitted from a wastewater treatment oxidation ditch by adsorption on activated carbon

Bioaerosol emissions from wastewater and wastewater treatment processes are a significant subgroup of atmospheric aerosols. Most previous work has focused on the evaluation of their biological risks. In this study, however, the adsorption method was applied to reduce airborne microorganisms generated from a pilot scale wastewater treatment facility with oxidation ditch. Results showed adsorption on granule activated carbon (GAC) was an e cient method for the purification of airborne microorganisms. The GAC itself had a maximum adsorption capacity of 2217 CFU/g for airborne bacteria and 225 CFU/g for fungi with a flow rate of 1.50 m3/hr. Over 85% of airborne bacteria and fungi emitted from the oxidation ditch were adsorbed within 80 hr of continuous operation mode. Most of them had a particle size of 0.65–4.7 m. Those airborne microorganisms with small particle size were apt to be adsorbed. The SEM/EDAX, BET and Boehm’s titration methods were applied to analyse the physicochemical characteristics of the GAC. Relationships between GAC surface characteristics and its adsorption performance demonstrated that porous structure, large surface area, and hydrophobicity rendered GAC an e ective absorber of airborne microorganisms. Two regenerate methods, ultraviolet irradiation and high pressure vapor, were compared for the regeneration of used activated carbon. High pressure vapor was an e ective technique as it totally destroyed the microorganisms adhered to the activated carbon. Microscopic observation was also carried out to investigate original and used adsorbents.     

九佛污水处理厂培菌试运行

广州九佛污水处理厂采用四沟式氧化沟工艺,在Orbal氧化沟工艺前端增设了厌氧沟,在培茵、试运行过程中,出水稳定,为运营中小型污水处理厂提供了宝贵的经验。