Preparation Of Oxidized Lignite And Its Experimental Research On The Process Euipments For Organic Wastewater Treatment

This paper is intended to develop a new lignite-based adsorption material and water treatment process for printing and dyeing wastewater treatment. The lignite adsorption material was prepared using low-temperature air oxidation. With the methylene blue as study object, the adsorption properties of oxidized lignite on azo cationic dye were studied. The net filter and cationic polyacrylamide flocculation method were used to separate lignite from adsorption solution. Based on the designing and construction of water treatment test platform using lignite adsorption technology, the actual operation effect of the process units was studied. The results show that the oxygen containing functional groups increases during the low-temperature oxidation process, which is the fundamental cause of the changed lignite surface properties and pore structure and the increased adsorption performance of lignite on methylene blue. The adsorption process belongs to the spontaneous exothermic chemical adsorption process. The flocculation mechanism of cationic polyacrylamide on lignite particle includes charge neutralization and adsorption bridging. The experimental results of the static and pilot dynamic tests show that the azo cationic dye wastewater treatment process with lignite adsorption and separation is feasible and effective.