Influence of humic acid on bioavailability of heavy metals in sediments

2006 ◽  
Vol 25 (S1) ◽  
pp. 261-261 ◽  
Author(s):  
Wenhong Fan ◽  
Jun Chen
Keyword(s):  
Heavy Metals ◽  
Humic Acid

Performance of Photocatalytic Microfiltration with Hollow Fiber Membrane

2007 ◽  
Vol 544-545 ◽  
pp. 95-98 ◽  
Author(s):  
Jong Tae Jung ◽  
Jong Oh Kim ◽  
Won Youl Choi
Keyword(s):  
Heavy Metals ◽  
Humic Acid ◽  
Rate Constant ◽  
Hollow Fiber ◽  
Reaction Rate ◽  
Hollow Fiber Membrane ◽  
Membrane Surface ◽  
Reaction Rate Constant ◽  
Operational Parameters ◽  
Tio2 Particles

The purpose of this study is to investigate the effect of the operational parameters of the UV intensity and TiO2 dosage for the removal of humic acid and heavy metals. It also evaluated the applicability of hollow fiber microfiltration for the separation of TiO2 particles in photocatalytic microfiltration systems. TiO2 powder P-25 Degussa and hollow fiber microfiltration with a 0.4 μm nominal pore size were used for experiments. Under the conditions of pH 7 and a TiO2 dosage 0.3 g/L, the reaction rate constant (k) for humic acid and heavy metals increased with an increase of the UV intensity in each process. For the UV/TiO2/MF process, the reaction rate constant (k) for humic acid and Cu, with the exception of Cr in a low range of UV intensity, was higher compared to that of UV/TiO2 due to the adsorption of the membrane surface. The reaction rate constant (k) increased as the TiO2 dosage increased in the range of 0.1~0.3 g/L. However it decreased for a concentration over 0.3 g/L of TiO2. For the UV/TiO2/MF process, TiO2 particles could be effectively separated from treated water via membrane rejection. The average removal efficiency for humic acid and heavy metals during the operational time was over 90 %. Therefore, photocatalysis with a membrane is believed to be a viable process for humic acid and heavy metals removal.

scholarly journals Investigations on the mechanism, kinetics and isotherms of ammonium and humic acid co-adsorption at low temperature by 4A-molecular sieves modified from attapulgite

RSC Advances ◽  
2017 ◽  
Vol 7 (28) ◽  
pp. 17095-17106 ◽  
Author(s):  
Nan Sun ◽  
Wenxin Shi ◽  
Lixin Ma ◽  
Shuili Yu
Keyword(s):  
Heavy Metals ◽  
Aqueous Solution ◽  
Humic Acid ◽  
Low Temperature ◽  
Molecular Sieves ◽  
Co Adsorption ◽  
Aluminum Silicate ◽  
Silicate Mineral ◽  
Magnesium Aluminum Silicate ◽  
Kinetics And Isotherms

Attapulgite (ATP) is a type of natural magnesium aluminum silicate mineral and has been applied as an adsorbent to remove organic pollutants and heavy metals in aqueous solution.

scholarly journals Effect of humic acid on transformation of soil heavy metals

2017 ◽  
Vol 207 ◽  
pp. 012089
Author(s):  
Shengzhe Wu ◽  
Rui Li ◽  
Shuyang Peng ◽  
Qiuyong Liu ◽  
Xi Zhu
Keyword(s):  
Heavy Metals ◽  
Humic Acid ◽  
Soil Heavy Metals

Application of Photocatalytic Metal Membrane System for Water Purification

2006 ◽  
Vol 326-328 ◽  
pp. 1317-1320 ◽  
Author(s):  
Jong Oh Kim ◽  
Jong Tae Jung ◽  
Won Youl Choi
Keyword(s):  
Heavy Metals ◽  
Humic Acid ◽  
Uv Light ◽  
Removal Rate ◽  
Membrane System ◽  
Tio2 Powder ◽  
Metal Membrane ◽  
Tio2 Particles ◽  
Positive Effect

This study was conducted to evaluate the applicability of photocatalytic metal membrane system for the treatment of humic acid and heavy metals in aqueous solution. The catalysts, TiO2 powder P25 Degussa and metal membrane with 0.5 μm nominal pore size were used for experiments. Removal efficiency of humic acid and heavy metals increased with the increase of TiO2 dosage, however decreased over 0.3 g/L of TiO2 dosage. The addition of H2O2 as an oxidation reagent had a positive effect for the removal rate of humic acid and heavy metals. Metal membrane with stainless steel seemed to be quite stable to UV light with oxidation reagent in long-term operational periods over 6 months. Moreover, TiO2 particles can be effectively separated from the treated water by membrane rejection and the permeation flux was also enhanced by the combination of photocatalytic reaction.

Enhanced mobilization of arsenic and heavy metals from mine tailings by humic acid

Chemosphere ◽  
2009 ◽  
Vol 74 (2) ◽  
pp. 274-279 ◽  
Author(s):  
Suiling Wang ◽  
Catherine N. Mulligan
Keyword(s):  
Heavy Metals ◽  
Humic Acid ◽  
Mine Tailings

scholarly journals Phytoremediation of some heavy metals in contaminated soil

2019 ◽  
Vol 43 (1) ◽  
Author(s):  
Sherine M. Shehata ◽  
Reham K. Badawy ◽  
Yasmin I. E. Aboulsoud
Keyword(s):  
Heavy Metals ◽  
Humic Acid ◽  
Metal Ions ◽  
Foliar Application ◽  
Drainage System ◽  
Hibiscus Cannabinus ◽  
Favorable Effect ◽  
Hyperaccumulator Plants ◽  
Cr Uptake ◽  
Cultivated Soils

Abstract Background Several cultivated areas are irrigated with low-quality waters from the drainage system due to the shortage of suitable source of water for agricultural activities. Most of these drainage waters are contaminated with heavy metals which are concentrated in surface layer of the soil and translocated to plant and food chains. The region of Sahl El Husseiniya, Alsharqia government, is mainly irrigated with wastewater of Bahr El-Baqar drain. Objective Two types of hyperaccumulator plants represented by kenaf (Hibiscus cannabinus L.) and flax (Linum usitatissimum L.) were cultivated successively in the study area. Humic acid and gibberellin were used in this experiment as foliar sprayings to enhance the plant ability to absorb heavy metal ions from the soil. In addition, three soil additives represented by sulfur, vermiculite, and compost were also applied. Results Sulfur was the soil additive of the most pronounced effect on the uptake of Cr, Co, Cd, and Mn by the hyperaccumulator plants, while humic acid was of more favorable effect as a foliar treatment on Co and Cr uptake by flax and Cd and Mn uptake by kenaf. However, the foliar application of gibberellin enhanced plant growth and was of the best effect on both Co and Cr uptake by kenaf-cultivated soils and both Cd and Mn in flax-cultivated soils. In general, heavy metals were more concentrated in roots than in shoots. Comparing the efficiency of the two crops in cleaning soils, results implied that kenaf was of more favorable effect on the removal of Cr, Co, and Cd, while flax was of higher superiority in the removal of Mn. The efficiency of kenaf on removal of the studied metal ions followed the descending order of Cr > Co > Mn > Cd where their removal percentage values reached 50.71, 38.27, 33.98, and 14.43%, respectively. Flax phytoremediation efficiency followed the descending order of Mn > Cr > Co > Cd, where their removal percentage values reached 54.36, 36.95, 28.72, and 11.37%, respectively. Double season phytoremediation efficiency followed the order of Cr ≥ Mn > Co > Cd achieving 66.87, 65.63, 54.66, and 23.40%, respectively.

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