Efficient adsorption of U(VI) using in low-level radioactive wastewater containing organic matter by amino groups modified polyacrylonitrile fibers

2022 ◽  
Author(s):  
Xue Xia ◽  
Faqin Dong ◽  
Xiaoqin Nie ◽  
Ning Pan ◽  
Chang Liu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Amino Groups ◽  
Low Level ◽  
Radioactive Wastewater

scholarly journals Soil fertility status of some of the intensive crop growing areas under major agroecological zones of Bangladesh

2016 ◽  
Vol 41 (4) ◽  
pp. 735-757 ◽  
Author(s):  
NC Shil ◽  
MA Saleque ◽  
MR Islam ◽  
M Jahiruddin
Keyword(s):  
Organic Matter ◽  
Soil Fertility ◽  
Calcareous Soils ◽  
Clay Content ◽  
Soil Samples ◽  
Exchangeable K ◽  
Low Level ◽  
Fertility Status ◽  
Agroecological Zones ◽  
High Level

Laboratory studies on soil fertility evaluation was carried out across major agroecological zones (AEZs) of Bangladesh to know the nutrient status of soils and to relate those with soil properties like pH, organic matter, CEC, and clay content. Thirty five composite soil samples were collected from intensive crop growing sites, which covered 17 AEZs of Bangladesh. After proper processing, the samples were analyzed for texture, pH, organic carbon, CEC, exchangeable cations (K, Ca, Mg and Na), total N, available P and S following standard methods. The textural class of the soils collected from AEZ 12 and 13 appeared to be mostly clay. Clay loam soil was found in AEZ 4, 8, 9, 11, 25 and 28. Loamy soil was seen in AEZ 1 while AEZ 22, 23 and 29 were mostly sandy textured. The results revealed that 65.7% of the tested soil was acidic while 25.7% was alkaline in nature. All the tested soils showed lower pHKCl compared to pHH2O thus possessed negative charge. About 68.6% of the collected soils contained low (1.10-1.70%) level of organic matter, 25.7% soils retained it at medium level (1.71-2.40) and 5.7% soils at very low level (<1.0%). All the tested soils appeared to be deficient (< 0.12%) in nitrogen content. 68.6% soil samples had the low level of available P while only 8.6% retained it an optimum amount. About 80% of the tested soils contained low level of available S (7.9- 14.7 mg kg -1) although coastal regions soils hold higher amount of available S. High CEC (20-38 cmol kg-1) was found in clay rich soils of AEZ 10, 11, 12, and 13. Study revealed that 40% of the collected soils were very low, 31.4% were low, 8.6% each of medium and optimum, and 11.4% contained high level of exchangeable K. The calcareous soils (AEZ 10, 11, 12 and 13) contained very high level of Ca. Non calcareous soils also showed fairly good level of Ca content except AEZ 1, 3, 23 and 29. Sandy textured soils of greater Dinajpur, Rangpur, Moulvibazar showed lower level of exchangeable Mg. About 86% of the tested soils had the lower (< 2%) potassium saturation percentage (KSP), which needs K application for sustainable crop production. Estimate showed that 44% variability for CEC may be attributed by clay content and the relationship was significant (p = 0.05). Again, 50.4 and 65.6% variability in exchangeable K and Mg, respectively may be governed by clay content of the soils, while such relationship for Ca was non-significant. CEC may contribute 62.2, 92.3 and 83.9% variability for exchangeable K, Ca and Mg content in soils, respectively. The fertility status of most of the studied soils (except AEZ 10, 12, 13 and to some extent 11) appeared to be low to very low, which demand judicious management in order to achieve food security and to conserve the soil fertility.Bangladesh J. Agril. Res. 41(4): 735-757, December 2016

Enhanced rejection of cations by low-level cationic surfactant during ultrafiltration of low-level radioactive wastewater

2017 ◽  
Vol 175 ◽  
pp. 314-320 ◽  
Author(s):  
Xue Zhang ◽  
Lixia Niu ◽  
Fuzhi Li ◽  
Xuan Zhao ◽  
Hongying Hu
Keyword(s):  
Cationic Surfactant ◽  
Low Level ◽  
Radioactive Wastewater

Treatment of simulated low level radioactive wastewater by supported liquid membranes: uphill transport of Ce(III) using CMPO as carrier

1999 ◽  
Vol 18 (1) ◽  
pp. 57-69 ◽  
Author(s):  
Masaaki Teramoto ◽  
Sheng Sheng Fu ◽  
Kazuhiro Takatani ◽  
Noriaki Ohnishi ◽  
Taisuke Maki ◽  
...  
Keyword(s):  
Liquid Membranes ◽  
Low Level ◽  
Supported Liquid Membranes ◽  
Radioactive Wastewater

A comparison between the mode of sction of organic matter and synthetic polymers in stabilizing soil crumbs

1956 ◽  
Vol 47 (3) ◽  
pp. 350-353 ◽  
Author(s):  
W. W. Emerson
Keyword(s):  
Organic Matter ◽  
Polyvinyl Alcohol ◽  
Natural Soil ◽  
Amino Groups ◽  
Ionic Polymer ◽  
Phosphate Ions ◽  
Before And After ◽  
The Stability ◽  
Method Of Extraction ◽  
Neutral Sodium

Synthetic soil crumbs stabilized by the addition of small quantities of a polymer, and natural soil crumbs from old grassland, have been extracted with neutral sodium pyrophosphate and alkali and the strengths of the crumbs compared before and after extraction, using the sodium saturation technique. Three polymers were used: polyvinyl alcohol (a non-ionic polymer), sodium alginate, and a vinyl acetate-maleic anhydride co-polymer (Vama), the latter both carboxylated polymers. Pyrophosphate was able to displace the carboxylated polymers from the synthetic crumbs, but not the stabilizing fraction of the organic matter from the grassland crumbs. 0·5N-NaOH produced a much greater reduction on the strength of the alginate treated crumbs compared with Vama crumbs, which is attributed to the weaker hydrogen bonds formed by the former. Prolonged leaching with alkali removed a considerable part of the stabilizing organic matter in the grassland crumbs. Neither method of extraction affected the stability of the polyvinyl alcohol crumbs.It is concluded that the grassland crumbs are stabilized by the formation of inter-lamellar complexes with the clay in the crumbs, and probably that the substance forming the complexes is a polymer and contains amino-groups.Evidence is also given that phosphate ions and the carboxylated polymers are attached in the same manner to the edges of the clay crystals.

scholarly journals Selective adsorption of Cs+ by MXene (Ti3C2Tx) from model low-level radioactive wastewater

2020 ◽  
Vol 52 (6) ◽  
pp. 1201-1207 ◽  
Author(s):  
Byung-Moon Jun ◽  
Min Jang ◽  
Chang Min Park ◽  
Jonghun Han ◽  
Yeomin Yoon
Keyword(s):  
Selective Adsorption ◽  
Low Level ◽  
Radioactive Wastewater

scholarly journals Multiple riparian–stream connections are predicted to change in response to salinization

2018 ◽  
Vol 374 (1764) ◽  
pp. 20180042 ◽  
Author(s):  
Sally A. Entrekin ◽  
Natalie A. Clay ◽  
Anastasia Mogilevski ◽  
Brooke Howard-Parker ◽  
Michelle A. Evans-White
Keyword(s):  
Organic Matter ◽  
Aquatic Organisms ◽  
High Concentration ◽  
Ecological Consequences ◽  
Secondary Salinization ◽  
Organic Matter Production ◽  
Low Level ◽  
Salt Consumption ◽  
Matter Production ◽  
Microbial Decomposer

Secondary freshwater salinization, a common anthropogenic alteration, has detrimental, lethal and sub-lethal effects on aquatic biota. Ions from secondary salinization can become toxic to terrestrial and aquatic organisms when exposed to salinized runoff that causes periodic high-concentration pulses. Gradual, low-level (less than 1000 ppm salinity) increases in salt concentrations are also commonly documented in regions with urbanization, agriculture, drilling and mining. Despite widespread low-level salt increases, little is known about the biological and ecological consequences in coupled riparian–stream systems. Recent research indicates lethal and even sub-lethal levels of ions can subsidize or stress microbial decomposer and macroinvertebrate detritivores that could lead to alterations of three riparian–stream pathways: (i) salinized runoff that changes microbial decomposer and macroinvertebrate detritivore and algae performance leading to changes in composition and processing of detrital pools; (ii) riparian plant salt uptake and altered litter chemistry, and litterfall for riparian and aquatic detritivores and their subsequent enrichment, stimulating decomposition rates and production of dissolved and fine organic matter; and (iii) salt consumption in salinized soils could increase riparian detritivore growth, decomposition and dissolved organic matter production. Subsidy–stress and reciprocal flows in coupled riparian–stream connections provide frameworks to identify the extent and magnitude of changes in detrital processing from salinization. This article is part of the theme issue ‘Salt in freshwaters: causes, ecological consequences and future prospects’.

scholarly journals Analytical support for a new, low-level radioactive wastewater treatment plant

1990 ◽  
Author(s):  
V.D. Jones ◽  
J.H. Marsh ◽  
L.M. Ingram ◽  
W.L. Melton ◽  
E.J. Magonigal
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Low Level ◽  
Radioactive Wastewater

Filtering of Low-Level Radioactive Wastewater by Means of Vacuum Membrane Distillation

2016 ◽  
Vol 194 (3) ◽  
pp. 379-386 ◽  
Author(s):  
Xia Wen ◽  
Fuzhi Li ◽  
Xuan Zhao
Keyword(s):  
Membrane Distillation ◽  
Low Level ◽  
Radioactive Wastewater ◽  
Vacuum Membrane Distillation
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