scholarly journals Effects of Particle Size and Contact Time on the Reliability of Toxicity Characteristic Leaching Procedure for Solidified/Stabilized Waste

1998 ◽  
Vol 59 (2) ◽  
pp. 326-332 ◽  
Author(s):  
Michael A. Janusa ◽  
Jeffrey C. Bourgeois ◽  
Grant E. Heard ◽  
Nicole M. Kliebert ◽  
April A. Landry
Keyword(s):  
Particle Size ◽  
Contact Time ◽  
Toxicity Characteristic Leaching Procedure ◽  
Leaching Procedure

scholarly journals Ricinus CommunisPericarp Activated Carbon Used as an Adsorbent for the Removal of Ni(II) From Aqueous Solution

2008 ◽  
Vol 5 (4) ◽  
pp. 761-769 ◽  
Author(s):  
S. Madhavakrishnan ◽  
K. Manickavasagam ◽  
K. Rasappan ◽  
P. S. Syed Shabudeen ◽  
R. Venkatesh ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Activated Carbon ◽  
Contact Time ◽  
Metal Ion ◽  
Ricinus Communis ◽  
Ion Concentration ◽  
Batch Mode ◽  
Adsorption Data ◽  
Initial Ph

Activated carbon prepared from Ricinus communis Pericarp was used to remove Ni(II) from aqueous solution by adsorption. Batch mode adsorption experiments are carried out by varying contact time, metal-ion concentration, carbon concentration and pH to assess kinetic and equilibrium parameters. The adsorption data were modeled by using both Langmuir and Freundlich classical adsorption isotherms. The adsorption capacity (Qo) calculated from the Langmuir isotherm was 31.15 mg/g of activated carbon at initial pH of 5.0±0.2 for the particle size 125-250 µm.

Leaching properties of slag generated by a gasification/vitrification unit: The role of pH, particle size, contact time and cooling method used

2012 ◽  
Vol 207-208 ◽  
pp. 44-50 ◽  
Author(s):  
K. Moustakas ◽  
Al. Mavropoulos ◽  
E. Katsou ◽  
K.-J. Haralambous ◽  
M. Loizidou
Keyword(s):  
Particle Size ◽  
Contact Time ◽  
Cooling Method

scholarly journals The Novel Use of Saraca thaipingensis Leaf Powder as Potential Biosorbent Material for the Removal of Chromium(VI)

2015 ◽  
Vol 3 (3) ◽  
pp. 35-39
Author(s):  
Sannasi Palsan ◽  
Chai Swee Fern ◽  
Stephanie Bernardine ◽  
Lim Fan Shiang
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Contact Time ◽  
Low Cost ◽  
Peninsular Malaysia ◽  
The Novel ◽  
Batch Experiments ◽  
Chromium Vi ◽  
Removal Of Heavy Metals ◽  
Leaf Powder

Saraca thaipingensis or ‘Gapis’ tree, classified under the Fabaceae family is a native of Taiping; copious over Peninsular Malaysia and Southeast Asia. The withered and fallen dead leaves were collected from INTI International University’s garden walkway. To date, literature has yet to capture the use of S. thaipingensis tree parts or refuse as potential biosorbent material for the removal of heavy metals thus verifying the novelty of this study. Batch experiments were carried out with the leaf powder to study the effects of dosage, particle size and contact time towards Cr(VI) removal (%) at 1-100 mg/L. Results showed that Cr(VI) removal increased from 52.22% to 99.31% (p < 0.05) with increase in biosorbent dosage (0.005, 0.010, 0.015, 0.020, 0.025 and 0.050 g). The different particle size ranges tested were: 107-125, 126-150, 151-250, 251-500, and 501- 1000 ?m. Highest Cr(VI) removal of 99.53% was obtained with the 151-250 ?m particle size; further size decrease did not yield more removal (p > 0.05). The optimal Cr(VI) removal was recorded after 45 min (99.62%) and 90 min (99.76%) contact time (p > 0.05). Further characterization and optimization studies are being carried out to develop a novel, sustainable, low cost yet effective leaf powder based biosorbent material.

Collaborative Study of the Toxicity Characteristic Leaching Procedure (TCLP)

2009 ◽  
pp. 14-14-48 ◽  
Author(s):  
WB Blackburn ◽  
I Show ◽  
L Williams ◽  
DR Taylor ◽  
PJ Marsden
Keyword(s):  
Collaborative Study ◽  
Toxicity Characteristic Leaching Procedure ◽  
Leaching Procedure

scholarly journals Hierarchization of Physicochemical Factors during Simultaneous Removal of Lead and Copper from the Marrakech Municipal Discharge Soils

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Abdelaaziz Aityoub ◽  
Abdessalem Abouelfida ◽  
Abdelaziz Benyaich ◽  
Mohamed Elmeray ◽  
Rachid Idouhli ◽  
...  
Keyword(s):  
Particle Size ◽  
Soil Solution ◽  
Contact Time ◽  
Extraction Efficiency ◽  
Human Life ◽  
Influential Factor ◽  
Soil Decontamination ◽  
Harmful Action ◽  
Equal Importance ◽  
Physicochemical Factors

Heavy metals became a great concern for scientists due to their harmful action on the environment and human life. EDTA and NTA chelation capacity were used to assess soil decontamination. The effect of pH, ligand, soil solution contact time with agitation, soil solution ratio, and particle size were investigated, in order to prioritize them, using the design of experiment methodology (Doe): pH was the most influential factor while the ratio mass of the soil by the volume of the solution and particle size were of equal importance. EDTA was more effective as a chelator than NTA in removing metals from the soil. The contact time was not a significant factor; a contact time of 10 minutes was sufficient to extract the two metals studied. An extraction efficiency of 45% was achieved for Pb and 85% for Cu without optimization process.

Development of Adsorbent from Banana Peel for Wastewater Treatment

2012 ◽  
Vol 248 ◽  
pp. 310-315 ◽  
Author(s):  
Jimoh Abdulfatai ◽  
Abdulkareem Ambali Saka ◽  
Ayo Samuel Afolabi ◽  
Onazi Micheal
Keyword(s):  
Particle Size ◽  
Contact Time ◽  
Industrial Effluent ◽  
Oxygen Demand ◽  
Environmental Water ◽  
Sorption Process ◽  
Zinc Ion ◽  
Banana Peel ◽  
Chromium Ion ◽  
Effects Of Ph

This study investigated the development and application of banana peel for the remediation of heavy metals (Pb, Zn and Cr). Batch experimental processes as well as conditions that might influence the sorption of the metals were investigated. These conditions include effects of pH, contact time, adsorbent dose, and particle size. The applicability of the sorption process was tested on wastewater. The adsorbent activated with 0.5 M H2SO4 showed the highest percentage removal of chromium ion (88.9 %) at a pH of 6. It has been found that particle size has no effect on the removal of zinc ion and it has also been found that the removal efficiency of lead and chromium ion decreased with increase in contact time and particle size. Also, it can be seen from the results that untreated banana peel waste increases the biochemical oxygen demand (BOD) and chemical oxygen demand (COD) values of wastewater. The results from the optimized method revealed the applicability of the method to environmental water samples. This study therefore confirms that banana peel is a promising adsorbent for the removal of chromium from industrial effluent.

scholarly journals Recycling of Reverse Osmosis (RO) Reject Water as a Mixing Water of Calcium Sulfoaluminate (CSA) Cement for Brick Production

2019 ◽  
Vol 9 (23) ◽  
pp. 5044
Author(s):  
Hwan Lee ◽  
Dongho Jeon ◽  
Haemin Song ◽  
Sung Won Sim ◽  
Dohoon Kim ◽  
...  
Keyword(s):  
Reverse Osmosis ◽  
Toxicity Characteristic Leaching Procedure ◽  
Cement Pastes ◽  
Calcium Sulfoaluminate ◽  
Reject Water ◽  
Ettringite Formation ◽  
Friedel’S Salt ◽  
Mixing Water ◽  
Strength Improvement ◽  
Leaching Procedure

This study explored the possibility of using reverse osmosis (RO) reject water as a mixing water for producing cementitious bricks using calcium sulfoaluminate (CSA) cement along with gypsum, and it investigated the changes in the properties of CSA cement pastes when RO reject water was used. The results were compared with those obtained using purified water and seawater. Overall, the use of RO reject water improved the cement paste’s strength. Given that the use of RO reject water very slightly affected ettringite formation but more significantly influenced the Al2O3-Fe2O3-mono (AFm) phases (i.e., monosulfate, kuzelite, and Friedel’s salt) and amorphous aluminum hydroxide (AH3), the strength improvement was likely mainly due to the formation of Friedel’s salt rather than ettringite formation. This study also demonstrated that the use of RO reject water for brick production satisfied the Korean Standards (KS) F 4004 and toxicity characteristic leaching procedure (TCLP); thus, it is recommended to use RO reject water as a mixing water to produce CSA cement bricks for use in construction.

Ammonium nitrogen removal from anaerobically digested effluent of swine wastewater using local sand

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
D. Zheng ◽  
L.W. Deng ◽  
N.N. Liu ◽  
H. Yang ◽  
Y. Liu
Keyword(s):  
Particle Size ◽  
Adsorption Capacity ◽  
Nitrogen Removal ◽  
Contact Time ◽  
Ammonium Nitrogen ◽  
Langmuir Equation ◽  
Swine Wastewater ◽  
Ammonium Concentration ◽  
High Adsorption ◽  
Removal Capacity

A type of sand selected in Sichuan, China was identified with high adsorption capacity to ammonium nitrogen. The effects of contact time, initial ammonium concentration and particle size on the sand for removing ammonium from digested effluent of swine wastewater were investigated using a static shaker experiment. Results showed that the optimum contact time for sand to adsorb ammonium was 150 min. As initial ammonium concentration increased, the removal capacity of the sand increased, but the removal efficiency decreased. The adsorbed ammonium increased as the particle size decreased. At ammonium concentrations ranging from 27 0 to 553 mg L-1, the maximum ammonium adsorption capacity of the sand was approximately 0 77 mg g-1 according to the Langmuir equation. Based on these findings, the use of this local sand as an adsorption media for ammonium nitrogen removal from digested effluent of swine wastewater is feasible.

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