Study on Ammonia-Nitrogen and Humic Acid Removal Using Aluminum Oxide Molecular Sieve and Modified Clinoptilolite

2008 ◽  
Vol 36 (5-6) ◽  
pp. 512-516 ◽  
Author(s):  
Chen Liu ◽  
Xin-Wu Wu ◽  
Zhi-Yu Bao ◽  
Yan-Mao Dong
Keyword(s):  
Humic Acid ◽  
Aluminum Oxide ◽  
Molecular Sieve ◽  
Ammonia Nitrogen ◽  
Modified Clinoptilolite

Synthesis of (3-Mercaptopropyl)Trimethoxysilane-Modified ZMS and Study of the Enhancement of Ammonia-Nitrogen Removal from Water

2011 ◽  
Vol 686 ◽  
pp. 461-467
Author(s):  
Peng Zhu ◽  
Li Jiang Hu ◽  
Di Wang ◽  
Qun Zhang ◽  
Sheng Yao Song
Keyword(s):  
Drinking Water ◽  
Dynamic Simulation ◽  
Molecular Sieve ◽  
Ammonia Nitrogen ◽  
Rice Hull ◽  
Pore Surface ◽  
Mesoporous Zeolite ◽  
Rice Hull Ash ◽  
Micro Structures ◽  
Materials Studio

In this work, the mesoporous zeolite molecular sieve (ZMS, SBA-15) was prepared by rice hull ash (RHA) and the surface of ZMS pore was modified by (3-mercaptopropyl) trimethoxysilane (MCPMS) with sulfhydryl (SH) as active group connecting to the SBA-15 pore surface. The capacity of removing ammonia-nitrogen (NH3-N) in water will be increased because of the increasing in adsorption active groups. The micro-structures of SBA-15-SH were characterized by FTIR, SEM, TEM, SAXRD. The diffusion and adsorbed behavior of NH3-N in pores of the modified ZMS was simulate by using a molecular dynamic simulation (MDS) program of the Materials Studio software (MSS) which facilitated study of the effect of this modification on pore structure and adsorption capacity. As results of the experiments, the MCPMS-modified ZMS showed more efficient in removing NH3-N in drinking water than before the modification under the same conditions.

Ammonia-nitrogen and phosphates sorption from simulated reclaimed waters by modified clinoptilolite

2012 ◽  
Vol 229-230 ◽  
pp. 292-297 ◽  
Author(s):  
Hanxin Huo ◽  
Hai Lin ◽  
Yingbo Dong ◽  
Huang Cheng ◽  
Han Wang ◽  
...  
Keyword(s):  
Ammonia Nitrogen ◽  
Modified Clinoptilolite

scholarly journals Recovery of ammonia nitrogen from landfill leachate using a biopolar membrane equipped electrodialysis system

2020 ◽  
Vol 82 (9) ◽  
pp. 1758-1770
Author(s):  
Cunkuan Zhang ◽  
Wenchuan Ding ◽  
Xiaolan Zeng ◽  
Xiaotang Xu
Keyword(s):  
Humic Acid ◽  
Removal Efficiency ◽  
Landfill Leachate ◽  
Inhibitory Effect ◽  
Ammonia Nitrogen ◽  
Alkaline Condition ◽  
Bipolar Membrane ◽  
Substantial Impact ◽  
High Concentrations ◽  
Exchange Membrane

Abstract In this paper, a laboratory-scale electrodialysis reactor with five compartment cells separated by a bipolar membrane and ion exchange membrane was assembled to remove ammonia nitrogen from landfill leachate as a pretreatment process. The effects of humic acid, magnesium ions (Mg2+) and calcium ions (Ca2+) existing in leachate on the removal efficiency of ammonium () were investigated by using simulated wastewater. The results indicate that humic acid has little impact on ammonium in the presence of an electric field. High concentrations of Mg2+ and Ca2+ in solution have a substantial impact on the removal efficiency of ammonium, but the average migration rate of the three ions is > Mg2+ > Ca2+ under the same current intensity, and plays a major role in electromigration for mixture electrodialysis. Therefore, ammonia nitrogen can be separated from leachate and accumulated effectively. Meanwhile, the bipolar membrane near the cathode produces alkali that is released into the base cell to promote ammonia nitrogen transformation from accumulated ammonium, which creates in-site alkaline condition for ammonia nitrogen recovery by a further stripping process. When the actual leachate collected from a local municipal sanitary landfill was employed, the reactor reached 86.17% of ammonia nitrogen removal after 3.0 h reaction. Analysis of membrane scale suggests the inhibitory effect of Mg2+ on Ca2+ migration during the initial working period of the reaction can potentially slow down the membrane scaling of the cation exchange membrane. This study provides a promising technology for the removal and recovery of ammonia nitrogen from landfill leachate.

Preferential Sorption of Tannins at Aluminum Oxide Affects the Electron Exchange Capacities of Dissolved and Sorbed Humic Acid Fractions

2020 ◽  
Vol 54 (3) ◽  
pp. 1837-1847 ◽  
Author(s):  
Edisson Subdiaga ◽  
Mourad Harir ◽  
Silvia Orsetti ◽  
Norbert Hertkorn ◽  
Philippe Schmitt-Kopplin ◽  
...  
Keyword(s):  
Humic Acid ◽  
Aluminum Oxide ◽  
Electron Exchange ◽  
Preferential Sorption

Modification of Natural Clinoptilolite and its Uptake of NH4+

2010 ◽  
Vol 178 ◽  
pp. 191-195
Author(s):  
Zhi Yong Ji ◽  
Jun Sheng Yuan ◽  
Min Su
Keyword(s):  
Crystal Structure ◽  
Chemical Modification ◽  
Adsorption Capacity ◽  
Ammonia Nitrogen ◽  
Hebei Province ◽  
Ammonium Salts ◽  
Physical Modification ◽  
Natural Clinoptilolite ◽  
Modified Clinoptilolite ◽  
Apparent Influence

Natural clinoptilolite collected from Chicheng of Hebei province in China, was treated with physical modification using sodium/ammonium salts, chemical modification using NaOH or NaAlO2, and physicochemical modification using NaOH or NaAlO2 and NaCl in order, respectively. And its adsorption capacity of NH4+ in different conditions was investigated. The results show that modified clinoptilolite has the same crystal structure, and the clinoptilolite modified with NaOH or NaAlO2 has good uptake of ammonia ion; the concentration of NaAlO2 has apparent influence on the removal of ammonia nitrogen, and the perfect concentration is 0.1 mol/L and the uptake could reach 0.92 mmol/g in the 100 mg/L NH4+ solution; the existence of K+、Na+、Ca2+、Mg2+ decreases the uptake of ammonia ion on clinoptilolite modified with 0.1 mol/L NaAlO2.

Study of POSS-Modified ZMS Exchanging Ammonia-Nitrogen in Water with Quantum Chemistry Program Based on DFT

2011 ◽  
Vol 183-185 ◽  
pp. 800-804 ◽  
Author(s):  
Di Wang ◽  
Peng Zhu ◽  
Li Jiang Hu
Keyword(s):  
Activation Energy ◽  
Density Functional Theory ◽  
Quantum Chemistry ◽  
Molecular Sieve ◽  
Density Functional ◽  
Ammonia Nitrogen ◽  
Active Group ◽  
Mesoporous Zeolite ◽  
Functional Theory ◽  
Simulation Process

In this work, the mesoporous zeolite molecular sieve (ZMS, SBA-15) was modified by polyhedral ologomeric silsesquioxane (POSS) with sodium carboxylates(-COONa) and sodium sulphonate (-SO3Na) as ion-exchanging active group. With this approach, the capacity of removing ammonia-nitrogen (NH3-N) in water will be greatly increased because of changing and increasing of active groups. The exchangeing process between NH3-N and the active group in the pore of POSS modified SBA-15 including sodium silanolate (-SiONa), -COONa and -SO3Na was simulated by using Dmol3 program of the Materials Stutio (MS)software which is the quantum chemistry program based on density functional theory (DFT). In the simulation process the transition state of the exchanging reaction was searched with LST/QST algorithm and the activation energy of reaction was calculated. As the results of simulation and calculation, the activation energy of exchanging reaction between NH3-N and sodium sulphonate (-SO3Na) is smallest and the thermal effect of exchanging reaction between NH3-N and -SO3Na is lowest in all exchanging reactions, which means the exchanging reaction between NH3-N and -SO3Na proceeds more easily than others two exchanging reactions. The POSS-SO3Na is a better modifier for SBA-15 to remove NH3-N in water.

Sign in / Sign up

Export Citation Format

Share Document