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Activated carbon adsorption treatment of ester-containing wastewater from a lithium battery plant and microwave regeneration experiment

by:dcfpower     2021-03-12
The activated carbon adsorption method was used to pretreat the ester-containing wastewater produced by the lithium battery pack, and the effects of adsorption time, initial pH value and activated carbon dosage on the removal of COD from the wastewater were studied. The activated carbon after the adsorption was saturated with microwave was regenerated, and the radiation was investigated. The effect of irradiation time, microwave power and regeneration times on the regeneration effect of activated carbon. The results show that when the dosage of activated carbon is 10g/L, adsorption is 60min, the COD removal rate of ester-containing wastewater is 69.5%, and the biodegradability is from 0.05 of the raw water. Increase to 0.25. When the microwave power is 420W and the irradiation time is 6min, the activated carbon can be effectively regenerated, the regeneration efficiency is as high as 98.0%, and the loss rate of activated carbon is about 5.2%. The infrared spectra of activated carbon before and after regeneration show that the surface functional groups of activated carbon Changes have taken place to promote the adsorption of pollutants by activated carbon. As a kind of clean energy, the application of lithium batteries has become more and more common, but the environmental pollution caused by its production process has also attracted increasing attention. At present, the treatment of battery wastewater at home and abroad is mainly focused on the removal of heavy metals. The treatment of organic wastewater generated in the battery production process, especially ester-containing wastewater has not been reported. During the lithium battery pack production process of a factory in the north, about 15 tons of ester-containing wastewater is discharged every day, which mainly contains small-molecule ester organic substances. The wastewater has a relatively high concentration of organic matter, with a pH of 3 to 5, which is acidic wastewater, and the BOD/COD is 0.05 to 0.12, which is not suitable for direct biological treatment. According to the needs of industrial wastewater treatment and the geographical environment characteristics of the plant, the adsorption pretreatment of wastewater with activated carbon can reduce the inhibitory effect of toxic pollutants on microorganisms during subsequent biological treatment and ensure the stable operation of the biochemical system. In addition, it can also Reduce the hydraulic retention time of the biochemical treatment of wastewater, greatly reduce the investment and operating costs. The saturated activated carbon can be reused after regeneration. The traditional regeneration methods of activated carbon mainly include thermal regeneration, solvent regeneration and biological regeneration. Thermal regeneration is currently one of the most important forms of activated carbon regeneration. Microwave regeneration is an effective regeneration technology L3J developed on the basis of traditional thermal regeneration. Compared with traditional thermal regeneration, it has the advantages of short regeneration time, high regeneration efficiency, low ear loss rate, and low consumption. Based on this, this paper adopts the method of activated carbon adsorption to study the influence of adsorption time, the initial pH value of wastewater and the amount of activated carbon added on the adsorption effect of activated carbon, and uses microwave irradiation to regenerate the adsorbed activated carbon. Observe the microwave radiation The effects of irradiation time and microwave power on the efficiency of activated carbon regeneration and carbon loss rate were regenerated many times under suitable conditions. Full text file download: Download information [File size: 364.15 KB Downloads: Times] Click to download the file: Activated carbon adsorption treatment of ester-containing wastewater from a lithium battery pack plant and microwave regeneration experiment.pdf

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