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Development Of A New Redox-Active Porous Material For Groundwater Remediation

Yan-Feng Zhuang, Maggie L. White, Claire I. Fialips

Abstract
Laboratory experiments have shown that reducing iron in smectites promotes the degradation of various redox sensitive organics, including nitroaromatics and chlorinated compounds. Fe-bearing smectites have however never been used in the design of permeable reactive barriers (PRBs) for groundwater remediation. One basic requirement when designing PRBs is to keep their permeability equal to or higher than that of the surrounding aquifer materials to avoid affecting groundwater flow. Smectite clays are very low permeability materials and, when physically mixed with permeable materials, such as sand, clay particles can migrate and clog up pores, resulting in a progressive loss in permeability. In this study, we are developing a novel Fe-bearing clay-material suitable for permeable water treatment systems, including PRBs. Fe-smectite particles are tightly attached to the surface of sand grains using polyvinyl alcohol (PVA). To identify optimum procedures, we are studying the relationships between the size and texture of the sand grains, the clay/PVA and clay/sand ratio, the quality and extent of clay coverage, the stability of the clay-coated sand to changes in pH and redox conditions, and its hydraulic properties before and after iron reduction. The best clay coatings have been obtained using the most angular sands with rough surfaces and medium grain sizes (0.3-0.6mm). An optimum coating of 61.5 mg clay/g sand was obtained using the nontronite Nau- 2. The clay-coated sand is stable when pH is below 7 (no detachment of the clay particles). For pH higher than 7, a maximum of 14% of the clay-coating is detaching when the sample is not disturbed, and 28% if shaken. XRD analyses of the clay-coated sand also show that the coated smectite retains its swelling properties (d-spacing at 17.1Å after ethylene glycol treatment). The clay-coated sand is also stable to changes in redox conditions, with less than 15% detachment after 4h of treatment with sodium dithionite at 25°C. The coated clay is reducible, with a maximum reduction level of 83% (Fe(II)/Fe total). The hydraulic properties of the clay-coated sand are suitable for use in permeable systems. The effect of the reduced clay-coated sand on the degradation of redox-sensitive organics will be tested using nitrobenzene.

Development Of A New Redox-Active Porous Material For Groundwater Remediation

Upward gradient EKG and electro-osmosis for deep soft ground consolidation

Yan-feng Zhuang, Zhitao Liu, Zhengxin Li, Hongwei Wang, Tong Yang, Ganglin Li. Upward gradient EKG and electro-osmosis for deep soft ground consolidation. 11th International Conference on Geosynthetics, 16th-21st September, 2018, KGSS, Seoul, Korea. (Flash Disk, paper SS3-01)

ABSTRACT:
Electro-Kinetic Geosynthetics (EKG) presents a new category of geosynthetics. It inspires enthusiasm to apply electro-osmosis (EO) in large scale engineering applications, such as soft ground improvement, sludge dewatering, soil remediation, etc. This paper presents a kind of specially designed EKG and DC power source to carry out electro-osmotic consolidation for soft ground in vertical direction instead of horizontal direction. It is aiming at providing a better consolidation effect without degradation along depth for deep soft ground improvement. In-situ experiment shows that bearing capacity of the hydraulically filled sludge could be increased to 80-90 kPa after upward gradient electro-osmosis treatment and consolidation effect along depth is more homogenous than that of horizontal electro-osmosis using normal E-board. Development of EKG materials and automated DC power source are two key breakthroughs that pushing forward both researches and applications EO technique, which has over 200 years of history already.

Keywords: Electro-osmosis; EKG; consolidation; soft ground improvement

Upward gradient EKG and electro-osmosis for deep soft ground consolidation

Application of Novel EKG and Electro-osmosis in Hydraulically Filled Sludge Dewatering and Consolidation

Yan-feng Zhuang. Application of Novel EKG and Electro-osmosis in Hydraulically Filled Sludge Dewatering and Consolidation. Proceedings of 61h Asian Regional C onference on Geosynthetics, “Geosynthetics for Infrastructure Development”, 8th-llth Nov. 2016, in New Delhi. India. Central Board oflrrigation & Power
(CBIP), New Delhi. India: KN-55 ~ KN-63. (Keynote)

ABSTRACT

Electro-Kinetic Geosynthetics (EKG) inspires enthusiasms for research on electro-osmosis. Mechanically dewatering of hydraulically filled sludge is difficult due to low hydraulic permeability of sludge, while electro-osmosis provides a promising solution. Two types of EKG, E-board and E-tube, are developed for sludge dewatering. EKG solved the problem of electrode corrosion and new challenges is high electric power requirement. Energy level gradient theory is presented as a fundamental theory to propose design method for sludge dewatering. Key parameters of flow coefficient and time factor are discussed, including their test method, value range and scale effect. Roll polling electro-osmosis scheme is the solution for high power requirement. Estimation of power and design of roll polling electro-osmosis scheme is core of electro-osmotic dewatering design. Novel DC power source is custom built to realize the roll polling scheme. The DC power source of 80V/1000A has roll polling program embedded and it is in charge of 12 independent sections, which can deal with ~2000 square meters of hydraulically filled area.

Application of Novel EKG and Electro-osmosis in Hydraulically Filled Sludge Dewatering and Consolidation

Case Study on Hydraulic Reclaimed Sludge Consolidation Using Electrokinetic Geosynthetics

ABSTRACT: A hydraulic reclaimed sludge of 19m long, 15m wide and 5.8m deep was treatedusing electro-osmosis technique. A novel Electrokinetic Geosynthetics (EKG) and automated electric power source was developed for the electro-osmotic consolidation. It took only 36 days to reduce water content from 62% to 36% and it would take 3 years for preloading consolidation to achieve the same effect. After the treatment, bearing capacity of the fluid-like sludge was increased to 70kPa. Besides EKG materials, design of electro-osmosis scheme is the key issue for the success of electro-osmotic consolidation. Issues of energy consumption and cost and challenges in large scale applications are discussed after presenting experience with the EKG.

Keywords: Electro-osmosis; EKG; consolidation; reclamation

Case Study on Hydraulic Reclaimed Sludge Consolidation Using Electrokinetic Geosynthetics

reCAPTCHA or Captcha

ReCAPTCHA

  • abstract:
    • reCAPTCHA is a user-dialogue system originally developed by Luis von Ahn, Ben Maurer, Colin McMillen, David Abraham and Manuel Blum at Carnegie Mellon University’s main Pittsburgh campus, and acquired by Google in September 2009. Like the CAPTCHA interface, reCAPTCHA asks users to enter words seen in distorted text images onscreen.

对于垃圾评论,重点还是要多加防范。WordPress用户可以通过多种方式来屏蔽垃圾评论:可以要求用户注册后才能进行评论,也可以安装验证码(比如WP-reCaptcha)插件等。

使用WordPress自带的垃圾评论插件:Akismet
1、在WordPress后台》插件下面有一个默认的Akismet插件。
2、启用插件然后注册,选择个人免费版,获取API秘钥,并进行简单的设置就可以了。

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《漫话土力学》 前言

2019-07-22 09:02  来源:岩土网

《漫话土力学》 前言

李广信

《漫话土力学》一书终于出发行了。感谢《中国岩土网》开辟了岩土评论这一园地,培育出这株奇葩;也感谢《人民交通出版社》克服了很多的麻烦,使它艰难地面世。挚友张在明先生已乘鹤西游,也就不再请一些谋而优则士的大家作序了,以免麒麟皮下露出马脚。从2017年1月签订出版合同并交稿,至今屈原都已经投江三次了,使喜欢它的读者们翘首以望,深感愧欠,并将修改后的“前言”再发一次,向多年来关注此书的读者们做一个交代。

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回顾岩土工程界的几次讨论与争论

2019-07-01 09:15  来源:岩土网  

回顾岩土工程界的几次讨论与争论

李广信

《岩土工程学报》创刊40周年,邀请我写一点东西表示纪念。回顾岩土工程界的几次争论,我都参与了,写下如下文字以资搪塞。      

《岩土工程学报》已经创刊40年了,对比书案上80年代面黄肌瘦的版本和现今宽大厚重的体魄,感觉它确实是长大了。感谢南科院多年的培育和扶植,使它立足于岩,扎根于土,风雨寒暑40年,枝繁叶茂地屹立在虎踞关上。

1979年正是全国意气风发,全民奋进的年代,岩土界的老先生们劫后余生,痛惜失去的十余年,一方面努力向国内介绍这期间国际上岩土界的学术进展,一方面尽力组织队伍,奋起直追;中年的岩土科技人员则满怀斗志,热情地拥抱“科学的春天”。适应这一形势,黄文熙先生以其崇高的学术威望和人格魅力,联合六个学会,创建了《岩土工程学报》这一在岩土界最具学术声望的刊物。

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