Ammonium removal from high-strength aqueous solutions by Australian zeolite

2016 ◽  
pp. 1-12 ◽  
Author(s):  
D. Thushari N. Wijesinghe ◽  
Kithsiri B. Dassanayake ◽  
Sven G. Sommer ◽  
Guttila Y. Jayasinghe ◽  
Peter J. Scales ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
High Strength ◽  
Ammonium Removal

Ammonium removal from aqueous solutions by fixed-bed column using corncob-based modified biochar

2017 ◽  
Vol 40 (6) ◽  
pp. 683-692 ◽  
Author(s):  
Lan Huong Nguyen ◽  
Thi Mai Vu ◽  
Thi Trinh Le ◽  
Van Tuyen Trinh ◽  
Thi Pha Tran ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Fixed Bed ◽  
Fixed Bed Column ◽  
Ammonium Removal ◽  
Modified Biochar

Microstructure and Tensile Properties of Oxide Dispersion Strengthened Molybdenum Alloys Prepared by Different Doping Process

2007 ◽  
Vol 353-358 ◽  
pp. 481-484 ◽  
Author(s):  
Yuan Jun Sun ◽  
Guo Jun Zhang ◽  
Chao Zuo ◽  
Jian Feng Wei ◽  
Jun Sun
Keyword(s):  
Aqueous Solutions ◽  
Tensile Properties ◽  
High Strength ◽  
Oxide Dispersion Strengthened ◽  
Strengthening Mechanism ◽  
Solid Particles ◽  
Mechanism Analysis ◽  
Dispersion Strengthening ◽  
Fine Grain ◽  
Molybdenum Alloys

The oxide lanthanum dispersion strengthened molybdenum alloys were prepared by proprietary powder metallurgy technology, in which the Mo-La2O3 powders were prepared by liquid-liquid doping process which the oxide lanthanum was added to ammonium bi-molybdate solutions as aqueous solutions of La(NO3)3 and liquid-solid doping process which the oxide lanthanum was added to molybdenum oxide solid particles as aqueous solutions of La(NO3)3, respectively. The microstructure and tensile properties of the molybdenum alloys were investigated at room temperature. The results show that the molybdenum alloys all have fine molybdenum grains, and the molybdenum alloy prepared by liquid-solid doping process mainly contain fine oxide lanthanum particles of submicron and nano-sized while the alloy prepared by liquid-liquid doping process mainly contain nano-sized fine oxide lanthanum particles. The molybdenum alloys prepared by liquid-liquid doping process have higher yield strength and ductility than yield-solid doping process. The results of strengthen mechanism analysis show that the high strength of the molybdenum alloys can be advisablely explained by the fine grain strengthening and particles dispersion strengthening mechanism through the Hall–Petch relationship and Orowan model.

scholarly journals Lampiran 5A paper Removal of nitrate, ammonia and phosphate from aqueous solutions in packed bed filterusing biochar augmented sand media

2021 ◽  
Author(s):  
Philiphi de Rozari
Keyword(s):  
Aqueous Solutions ◽  
Nitrate Removal ◽  
Packed Bed ◽  
Packed Columns ◽  
Synthetic Wastewater ◽  
Nutrient Concentrations ◽  
Ammonium Removal ◽  
Regulatory Limits ◽  
Maximum Allowable Concentrations ◽  
Study Laboratory

Nutrients from wastewater are a major source of pollution because they can cause significant impact on the ecosystem. Accordingly, it is important that the nutrient concentrations are kept to admissible levels to the receiving environment. Often regulatory limits are set on the maximum allowable concentrations in the effluent. Therefore, wastewater must be treated to meet safe levels of discharge. In this study, laboratory investigation of the efficiency of packed bed filters to remove nitrate, ammonium and phosphate from aqueous solutions were conducted. Sand and sand augmented with hydrochloric acid treated biochar (SBC) were used as packing media. Synthetic wastewater solution was prepared with PO43-, NO3-, NH4+ concentrations 20, 10, 50 mg/L, respectively. Each experiment ran for a period of five days; samples from the effluent were collected on alternate days. All experiments were duplicated. Over the experiment period, the average removal efficiency of PO43-, NO3-, NH4+ were 99.2%, 72.9%, 96.7% in the sand packed columns and 99.2%, 82.3%, 97.4% in the SBC packed columns, respectively. Although, the presence of biochar in the packing media had little effect on phosphate and ammonium removal, it significantly improved nitrate removal

Synthesis of a novel Fe–Mn binary oxide‐modified lava adsorbent and its effect on ammonium removal from aqueous solutions

2019 ◽  
Vol 92 (6) ◽  
pp. 850-864
Author(s):  
Ziyi Zhao ◽  
Shuang He ◽  
Fayong Li ◽  
Yingbing Jin ◽  
Sangar Khan ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Binary Oxide ◽  
Ammonium Removal

Nitrification of high-strength ammonium wastewater by a fluidized-bed reactor

2004 ◽  
Vol 49 (5-6) ◽  
pp. 65-71 ◽  
Author(s):  
A.E.F. Botrous ◽  
M.F. Dahab ◽  
P. Mihaltz
Keyword(s):  
Fluidized Bed ◽  
High Strength ◽  
Fluidized Bed Reactor ◽  
Removal Rates ◽  
Ammonium Removal ◽  
Loading Rates ◽  
Conventional Activated Sludge ◽  
Nitrite Nitrogen ◽  
Order Of Magnitude ◽  
Activated Sludge Systems

A laboratory-scale fluidized-bed reactor with an external aeration loop was used for nitrification of high-strength ammonium wastewater (up to 500 mg NH4-N/L). The results demonstrated that the system is capable of handling ammonium removal rates of up to 2.5 kg NH4-N/m3·d, while removal efficiencies were as high as 98% and independent of the applied ammonium loading rates. Ammonium loading rates higher than 2.5 kg NH4-N/m3·d resulted in decreased ammonium removal efficiency. The data show that near complete ammonium removal occurred at DO concentrations as low as 0.3-0.5 mg/L. However, the nitrite-nitrogen fraction in the effluent increased from 3.5% to 23.2% when the DO dropped from 1.0 mg/L to approximately 0.4 mg/L, respectively. The high specific removal rates in this system are one order of magnitude higher than that of suspended-growth systems. This can reduce the supplementary reactor volumes required for nitrification to less than 10% of that needed in conventional activated sludge systems. These results clearly indicate the potential economic gains that could be achieved through implementation of this technology.

Stress Corrosion Cracking of a High-Strength Steel in Aqueous Solutions

CORROSION ◽  
1994 ◽  
Vol 50 (11) ◽  
pp. 898-903
Author(s):  
J. G. Gonzalez-Rodriguez ◽  
R. P. M. Procter
Keyword(s):  
Aqueous Solutions ◽  
Stress Corrosion ◽  
Stress Corrosion Cracking ◽  
High Strength Steel ◽  
High Strength ◽  
Corrosion Cracking

Ammonium removal from aqueous solutions by reverse osmosis using cellulose acetate membranes

Desalination ◽  
2005 ◽  
Vol 184 (1-3) ◽  
pp. 149-155 ◽  
Author(s):  
Antonio Bódalo ◽  
José-Luis Gómez ◽  
Elisa Gómez ◽  
Gerardo León ◽  
María Tejera
Keyword(s):  
Aqueous Solutions ◽  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Ammonium Removal ◽  
Cellulose Acetate Membranes

Removal of ammonium from aqueous solutions using the residue obtained from struvite pyrogenation

2011 ◽  
Vol 64 (12) ◽  
pp. 2508-2514 ◽  
Author(s):  
Haiming Huang ◽  
Qianwu Song ◽  
Chunlian Xu
Keyword(s):  
Aqueous Solutions ◽  
Experimental Results ◽  
Synthetic Wastewater ◽  
Ammonium Concentration ◽  
Ammonium Removal ◽  
Optimum Ph ◽  
Series Of Experiments ◽  
Release Ratio ◽  
Phosphate Source ◽  
The Cost

This paper reports the results of laboratory studies on the removal of ammonium from aqueous solutions using struvite pyrogenation residues. A series of experiments were conducted to examine the effects of the pyrogenation temperature (90–210 °C) and time (0.5–4 h) on the ammonium release of struvite. In addition, the pyrolysate of struvite produced at different pyrogenation temperatures and times was recycled for ammonium removal from aqueous solutions. The experimental results indicated that the ammonium release ratio of struvite increased with an increase in the pyrogenation temperature and time, and the struvite pyrolysate used as magnesium and phosphate source for ammonium removal was produced at the optimal condition of pyrogenation temperature of 150 °C for 1 h. Furthermore, experimental results showed that the optimum pH and pyrolysate dosage for ammonium removal from 100 ml synthetic wastewater (1,350 mg ammonium/L) were at pH 9 and 2.4 g of struvite pyrolysate, respectively, and initial ammonium concentration played a significant role in the ammonium removal by the struvite pyrolysate. In order to further reduce the cost of struvite precipitation, the struvite pyrolysate was repeatedly used for four cycles. The results of economic analysis showed that recycling struvite for three process cycles should be reasonable for ammonium removal, with ammonium removal efficiencies of over 50% and a reduction of 40% in the removal cost per kg NH4+.

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