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The Study of Attapulgite-Inorganic Salt Composites Applied in Wasterwater Treatment

Author: HeXiaoJuan
Tutor: LiangWeiDong
School: Lanzhou University of Technology
Course: Environmental Engineering
Keywords: Attapulgite - salt Composites Wastewater treatment Adsorption kinetics Adsorption thermodynamics
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 72
Quote: 0
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Abstract


This paper mainly on attapulgite - inorganic salt composites research and applications in wastewater treatment. As follows: (1) attapulgite as raw materials, the use of calcium chloride-modified attapulgite clay, its TEM, IR spectroscopy. Using the modified attapulgite mud treatment methylene blue wastewater, methylene blue initial concentration, wastewater pH, wastewater temperature, stirring speed aspects of their research. The kinetics and thermodynamics of adsorption properties. The results show that: In the experimental range, the of Attapulgite mud adsorption of methylene blue can with a good description of the Langmuir isotherm adsorption process in line with the quasi-second-order equation. Calculated △ G ~~ 0 lt; 0, △ H to 0 lt; 0, △ S to 0 lt; 0, adsorption is a spontaneous, exothermic process, to order changes. (2) calcium chloride modified attapulgite composite use of waste recycling. From roasting and pyridine modified attapulgite slag recycling, utilization of resources. Later, with the 400 ° C calcined slag using 6 times lower adsorbent active sites, adsorption performance degradation. The pyridine modified slag got to the adsorption of methylene blue. Study Benzoyl peroxide initiator, monomer MODIFIED waste treatment in methylene blue wastewater pyridine, experiments show that both methods can make attapulgite slag utilized. Especially the latter method, the recovery modified adsorbent used in the depth of processing of other organic wastewater which play a resource recycling purposes. (3) using the calcium salt prepared attapulgite desiccant performance prepared under different conditions with attapulgite calcium chloride filled more the desiccant absorption of moisture better. Comparison, the smaller the specific surface area by several methods, Description calcium salts embedded ATTAPULGITE layer is more conducive to the absorption of moisture. (4) the use of raw materials, iron salts, iron salts and aluminum salts were used to step-by-step titration Prepared the attapulgite ferrite catalyst and attapulgite / polymerization ferroaluminum flocculant. Detection by to study each preparation methods and conditions, the catalytic oxidation properties of the chemical wastewater and sewage flocculation test. Orthogonal experiment to optimize wastewater reaction conditions, the results showed that the catalyst and flocculant palygorskite wastewater degradation. The trial, further study of the value and effectiveness of attapulgite in wastewater treatment applications.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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