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Electro and Baromembrane Methods of Petrochemical Enterprises' Wastewater Treatment
Author(s) -
Alkenova Gauhar T.,
Kovrigina Tatyana V.,
Chalov Tulegen K.,
Ergozhin Edil E.
Publication year - 2015
Publication title -
remediation journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.762
H-Index - 27
eISSN - 1520-6831
pISSN - 1051-5658
DOI - 10.1002/rem.21444
Subject(s) - epichlorohydrin , electrodialysis , hexamethylenediamine , membrane , chemistry , glutaraldehyde , ion exchange , nuclear chemistry , chemical engineering , polymer chemistry , organic chemistry , ion , biochemistry , polyamide , engineering
The paper focuses on the development of production methods for new ion‐exchange membranes on the basis of ED‐20 industrial epoxide resin, resorcinol diglycidyl ether (RDGE), vinyl ether of monoethanolamine (VEMEA), and different di‐ and polyamines (polyethylenepolyamine (PEPA), polyethyleneimine (PEI), and hexamethylenediamine (HMDA)) in the presence of polyvinyl chloride (PVC) as a thermoplastic polymer binder. With the purpose to establish optimum conditions for synthesis of interpolymer membranes, the influence of reactants' concentration, of the temperature, of the nature and the quantity of the solvent, and of the process duration, was studied. It was found that when the VEMEA content in the reaction mixture is increased, the static exchange capacity (SEC) of the membrane increases in the presence of: PEI in the range of 1.2 to 4.7 mEq/L; PEPA: 1.0 to 4.0 mEq/L; and, HMDA: 1.4 to 5.2 mEq/L. It was shown that the optimum synthesis conditions are heating the reaction mixture to 60 °C to 70 °C for six to seven hours with constant stirring. For increasing the basicity of membranes, N‐alkylation was carried out using known alkylating agents (methyl iodide, dimethyl sulfate, and epichlorohydrin (ECH)). The primary electrochemical and physic‐mechanic properties of the obtained membranes were studied on pilot electrodialysis cells. The process flow diagram of the electrodialysis plant, as well as the engineering design documentation thereof were developed, and a pilot electrodialysis plant was constructed. The maximum production capacity of the pilot plant was 600 L/hr with a 30 percent desalinization rate. To increase the desalinization rate up to 75 percent, circulation of the solution and a decrease of production capacity was suggested. For meeting the treated water requirements in terms of salt content, a partial recirculation mode was introduced. In the course of the studies conducted, a process flow diagram was developed, and an experimental installation and a pilot reverse osmosis plant were fabricated for phenol and ammonium nitrogen purification. The pilot plant was tested using process condensate from the Pavlodar Petrochemical Plant. It was found that prior oxidation of the condensate with ozone in alkali medium resulted in phenol purification up to 85 percent and ammonium nitrogen up to 93 percent. ©2015 Wiley Periodicals, Inc.