Impact of acid treatment on the puzzolan activity of natural zeolite tuff

The commixture of sludge from Sindos industrial area of Thessaloniki with high quality HEU-type natural zeolite (tuff with 86 wt.% clinoptilolite-heulandite) in equal proportions, resulted in odourless and cohesive zeosludge. Also, the treatment of wastewater of pH 7.8 from the same area with high quality HEU-type natural zeolite (88 wt.% clinoptilolite-heulandite) resulted in production of clear water of pH 7.3, free of odours and improved quality parameters by 60% for the NO3 - content, 76% for the chemical oxygen demand (COD), 100% for P2O5 and Cr contents. Simultaneously, a precipitate of odourless and cohesive zeosludge was produced. The odourless and cohesive zeosludge produced either by the commixture of sludge with the natural zeolite or as precipitate from the treatment of industrial wastewater with the natural zeolite and coagulants, is suitable for safe deposition, since the fixation of the hazardous components in the micro/nano-pores of the HEU-type zeolite, as well as the meso- and macro-porous of natural zeolite, prevents their leaching by the rain water, protecting thus the quality of soils, surface and ground waters.

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Conserving Toxic Ammoniacal Nitrogen in Manure Using Natural Zeolite Tuff: A Comparative Study

Bulletin of Environmental Contamination and Toxicology ◽

10.1007/s001289900600 ◽

1998 ◽

Vol 60 (1) ◽

pp. 126-133 ◽

Cited By ~ 4

Author(s):

I. M. Dwairi

Keyword(s):

Comparative Study ◽

Natural Zeolite ◽

Ammoniacal Nitrogen ◽

Zeolite Tuff

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Modification of Lampung and Bayah Natural Zeolite to Enhance the Efficiency of Removal of Ammonia from Wastewater

Asian Journal of Chemistry ◽

10.14233/ajchem.2019.21810 ◽

2019 ◽

Vol 31 (4) ◽

pp. 873-878

Author(s):

Tiur Elysabeth ◽

Zulnovri ◽

Gina Ramayanti ◽

Setiadi ◽

Slamet

Keyword(s):

Ion Exchange ◽

Adsorption Capacity ◽

Natural Zeolite ◽

Acid Treatment ◽

Performance Test ◽

Hydroxyl Groups ◽

Ammonia Adsorption ◽

Modified Zeolite ◽

X Ray ◽

Modification Process

In this research, modification of Lampung and Bayah natural zeolites was carried out to increase the zeolite’s capacity as an ammonia adsorbent. Natural zeolite is modified by acid treatment using 6 M HCl and ion exchange using 1 M NH4NO3. The modification process continued with calcination at 500 °C for 4 h. X-ray fluorescence characterization shows changes in composition in the modified zeolites. The significant increase in the Si/Al ratio occurred in the modified zeolite with acid treatment that is 10.03 for Lampung natural zeolite HCl (LNZH) and 9.20 for Bayah natural zeolite HCl (BNZH). Surface area increases due to increasing Si/Al ratio. FTIR results indicate changes in the intensity of hydroxyl groups and pyrH+ as a result of the increase in total acidity of zeolites. The zeolites performance test proves that the Bayah natural zeolite has a higher ammonia adsorption capacity than Lampung natural zeolite. Ion exchange-modified zeolite has a higher ammonia adsorption capacity than zeolite modified with acid treatment.

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COMPOSITION AND MOLECULAR-SORPTION PROPERTIES OF THE ZEOLITE TUFF OF THE DEPOSITNEAR THE GREAT LULYA RIVER

Yugra State University Bulletin ◽

10.17816/byusu201713321-25 ◽

2017 ◽

Vol 13 (3) ◽

pp. 21-25

Author(s):

Tat'yana Nikolaevna Smorodinova ◽

Margarita Kondrat'evna Kotvanova

Keyword(s):

Phase Composition ◽

Molecular Sieve ◽

Natural Zeolite ◽

Raw Materials ◽

Sorption Properties ◽

Dynamic Conditions ◽

Molecular Sorption ◽

Branched Structure ◽

Zeolite Tuff ◽

Area Of Application

The elemental and phase composition of the natural zeolite tuff of the deposit near the Great Lulya river have been studied. The molecular sieve properties of zeolite tuff under dynamic conditions on model mix- tures of C6-C14 hydrocarbons have been studied. The possibility of separation of hydrocarbons of a normal and branched structure is shown. Thus, one more area of application of natural regional raw materials has been revealed.

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POZZOLANE AND CORROSION-INHIBITING PROPERTIES OF THE NATURAL ZEOLITE TUFF

Bulletin of Belgorod State Technological University named after V G Shukhov ◽

10.34031/2071-7318-2020-5-8-78-86 ◽

2020 ◽

Vol 5 (8) ◽

pp. 78-86

Author(s):

T. Smorodinova ◽

M. Kotvanova

Keyword(s):

Cement Paste ◽

Natural Zeolite ◽

Cement Stone ◽

Leaching Kinetics ◽

Reaction Products ◽

Natural Pozzolan ◽

Sulfate Ions ◽

Hydrolysis Of ◽

Zeolite Tuff ◽

Anticorrosion Properties

In this article the activity of the zeolite tuff of the Lulinsky deposit of Khanty-Mansiysk autonomous okrug –Yugra to calcium and sulfate ions has been evaluated . The components of zeolite tuff bind these ions to sparingly soluble products. The experimental results obtained show that tuff can be used as a natural pozzolan. Concerning the reaction products, the dynamics of the phase composition of cement paste with the zeolite tuff additives during hardening is shown. Supplementation promotes hydrolysis of alite, while the content of calcium hydrosulfoaluminate increases. The dynamics of strength and the compression of cement paste without an additive and with the zeolite tuff additive are estimated. The possibility and efficiency of using of zeolite tuff as a reinforcing additive to Portland cement is shown. It was found that a 5 % zeolite tuff additive with a particle size of 5-10 μm at 7 days increases the compressive strength by 15 %, and at 28 days by 21 %. The study of the calcium hydroxide leaching kinetics from cement stone is showed that a 5 % zeolite tuff additive leads to suppression of the leaching process and indicates anticorrosion properties of additives.

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Fasciaton of Pectate Elementary Fibrils

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100070746 ◽

1973 ◽

Vol 31 ◽

pp. 60-61

Author(s):

George F. Leeper

Keyword(s):

Acid Treatment ◽

Carbon Film ◽

Final Concentration ◽

Cellulose Microfibrils ◽

Pectic Acid ◽

Elementary Fibrils

Polysaccharide elementary fibrils are usually fasciated into microfibrils of from one hundred to a few hundred Angstroms wide. Cellulose microfibrils when subjected to acid treatment dissociate into component elementary fibrils. For pectic acid it was observed that variations in pH could cause a change in the fasciation of the elementary fibrils.Solutions of purified pectic acid and sodium phosphotungtate were adjusted to various pH levels with NaOH or HCl and diluted to give a final concentration of 0.5 and 1% for the polysaccharide and negative stains respectively. Micrographs were made of the samples after drying on a carbon film covered grid. The average number of elementary fibrils was determined by counting the number of elementary fibrils in each fascicle intersected by lines drawn across the micrograph.

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