iron and calcium based biogrouts for soil improvement
Therefore, suitable geotechnical applications of the calcium-based and iron-based biogrouts at a precipitated metal content of 1·5% w/w or less would be mainly the bioclogging of porous soils for the sealing of aquaculture or wastewater treatment ponds and landfill sites, and for plugging of the piping in dams and retaining walls in sandy soil.
• This process is often called "microbially induced calcium carbonate precipitation" (MICP). • Urease-producing bacteria (UPB) accelerate decay of urea to ammonium and carbonate in solution containing urea and calcium chloride : (NH 2) 2CO + 3H 2O 2NH 4 + + HCO 3-+ OH-• Due to this reaction, pH is increased and hydrocarbonate is produced.
"Iron- and calcium-based biogrouts for soil improvement", Proceedings of the 2014 Geo-Congress: Geo-Characterization and Modeling for Sustainability. (in press). Chu, J.,
The following biogrouts have been tested to strengthen soil and to decrease permeability of the sandy soil: 1) conventional biogrout containing calcium chloride, urea, and urease-producing bacteria. The conventional biogrout has been used as control; and 2) iron-based biogrout, which
An alternative approach in soil improvement techniques is to use microbial processes to improve the engineering properties of soil called microbial geotechnology. In addition to the use of calcium-based biocement, a new variation in biocement through the microbially induced iron …
Therefore, suitable geotechnical applications of the calcium-based and iron-based biogrouts at a precipitated metal content of 1?5 % w/w or less would be mainly the bioclogging of porous soils for the sealing of aquaculture or wastewater treatment ponds and landfill sites, and for plugging of the piping in dams and retaining walls in sandy soil. 1
Solving Chlorosis Problems and Total Nutrition for Trees ... sulfate forms of iron, manganese, copper and zinc plus boron and molybdenum. It has been very effective in ... excavations later showed micronutrients had reacted with calcium in the soil to become an insoluble cylindrical block.
New citations to this author. New articles related to this author's research. Email address for updates. ... Iron-based bio-grout for soil improvement and land reclamation. ... Clogging and cementation caused by calcium or iron biogrouts. V Ivanov, J Chu, M Naeimi. AGU Fall Meeting Abstracts, 2012. 1:
Request PDF on ResearchGate | Iron- and Calcium-Based Biogrouts for Soil Improvement | As an application of biotechnologies to geotechnical engineering, two types of biogrouts have been developed.
Bioclogging and Biocementation of Soil in Geotechnical Engineering Volodymyr Ivanov, Jian Chu, He Jia, Guo Chenghong, Saeid Rezaei Nejad and Maryam Naeimi School of Civil and Environmental Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 E-mail: [email protected] Introduction Microbial Geotechnology can be considered as a branch of …
: JIAN CHU,VOLODYMYR IVANOV. Iron-and Calcium-Based Biogrouts for Soil Improvement[C]. Geo-congress2014：ASCE,2014:1596-1601.,,. [J].,2015,36（S1）：392-396.,,.
How to Enhance Mineral Absorption. ... Those minerals may compete for absorption, but with high amounts of both iron and calcium I suppose the body (being a very efficient biochemist) knows how to control for proper absorption. ... after several months of taking the supplements there was not a noticeable improvement in iron levels in my blood ...
If your plants are showing signs of calcium deficiency, a soil additive can supply the missing nutrient. However, sometimes low levels of calcium in the soil aren't to blame for plants' deficiency ...
Iron-Based Bio-Grout For Soil Improvement and Land Reclamation. claisse.info. Maryam Naeimi. Jia He. Viktor Stabnikov. ... calcium-based grout can form precipitate after 10 minutes. Sandy soil treated with biogrouts Constant head permeability tests in a triaxial cell and unconsolidated undrained triaxial tests were carried out to measure the ...
Iron- and calcium-based biogrouts for porous soils &1 Volodymyr Ivanov PhD ... the amount of improvement was still much less than that obtained by chemical grouting. Therefore, suitable geotechnical applications of the calcium-based and iron-based biogrouts at …
The chemical form of iron is an important factor affecting the iron availability of vegetarian diets. Less than 40% of the iron in meat, poultry, and fish is in the heme form, which is more efficiently absorbed than the remaining nonheme iron present in these and all other foods (11–15).Nonvegetarian diets with substantial amounts of red meat supply about 2 mg/d, or 10–12%, of the total ...
Mar 25, 2014· The first is calcium based and composed of calcium salt, urease-producing bacteria (UPB), and urea, and the second is iron based and consists of iron salt, UPB, and urea. Studies showed that both biogrouts could be used to reduce the permeability and increase the shear strength of granular soil.
"Sedimentation behaviour of flocculant-treated soil slurry", Marine Georesources & Geotechnology, In press. 5) Choi^, S., Wu*, S.F. and Chu, J. (2016) "Biocementation for sand using eggshell as calcium source", Journal of Geotechnical and Geoenvironmental Eng,
Iron- and Calcium-Based Biogrouts for Soil Improvement Laboratory Study of the Effect of Electromagnetic Waves on Airflow during Air Sparging Leachability of 17-Year-Old Stabilized/Solidified Contaminated Site Soils
Biogrout. On the other hand, various minerals including calcium carbonate, calcium phosphate, calcium oxalate, silicate, and iron oxide are precipitated in nature by living organisms (Mann, 1993).These biominerals are promising engineering materials because they provide adequate strength and low environmental impact.
The medium for microbial cultivation is a solution of chemical reagents. Different kinds of wastes, such as mining and agricultural residuals, organic fraction of municipal solid wastes, sewage sludge, and reject water of municipal wastewater treatment plants altogether with agricultural fertilizers can be used as media to reduce the cost of large-scale production because of low requirements ...
Experimental study on precipitation rate of MICP under low temperatures: SUN Xiao-hao, MIAO Lin-chang, WU Lin-yu, WANG Cheng-cheng, CHEN Run-fa
In this paper, we propose several soil improvement techniques based on microbial functions. These techniques can control soil strength and permeability. The ureolytic bacterium, ... Iron- and Calcium-Based Biogrouts for Soil Improvement. Geo-Congress 2014 Technical Papers: ...
In conclusion, because the cost of biosealing of sand using calcium chloride- or iron ore-based biogrouts could be several times lower than any other known methods of the sand sealing, the biosealing has to be test in aquaculture practice for the construction of fish, prawns, or algae ponds in sand of the arid deserts.
Turf, ornamentals and certain trees are especially susceptible to iron deficiency, although in general, lack of iron in the soil is not a problem. Symptoms of iron deficiency can occur on soils with pH greater than 7.0. Specific needs for iron can be determined by soil test, tissue test and visual symptoms.
Start studying Wiley Quiz Questions - Chapters 5-8. Learn vocabulary, terms, and more with flashcards, games, and other study tools. ... improvement in the iron levels of the red blood cells, iron in the plasma, and iron stores in other tissues ... iron, copper, calcium…
Chu Jian. Associate Chair (Faculty), School of Civil and Environmental Engineering ... engineering properties of soils, soil improvement and land reclamation. ... and Stabnikov^, V. (2012). "Iron- and calcium-based biogrouts for porous soils", Construction Materials, ICE, London, Vol. 165, online on …
metal content, the amount of improvement was still much less than that obtained by chemical grouting. Therefore, suitable geotechnical applications of the calcium-based and iron-based biogrouts at a precipitated metal content of 1?5% w/w or less would be mainly the bioclogging of porous soils for the sealing of aquaculture or wastewater
Biogeochemical Model for Soil Improvement by Denitrification ... Abstract. A biogeochemical model describing the rate at which calcium carbonate (CaCO 3) is precipitated from the pore water and biogas (carbon dioxide and nitrogen gas) is generated by dissimilatory reduction of nitrate ... Iron- and Calcium-Based Biogrouts for Soil Improvement.
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