Preparation Of Liquid Sorbent With Waste Oil As Raw Material And Its Use For Copper Wastewater Treatment

Waste oil refers to waste oil of which the main component is higher fatty acid glycerides. Higher fatty acid glycerides can be decomposed into higher fatty acids and glycerol. By further deep processing, we can get bio-diesel and other products. However, because of high pressure and high temperature it requires, the costs are comparatively high. If the Waste oil was directly dumped, it will cause environmental pollution, or on the other hand it may be collected by outlaws for edible use after simple refining, threatening people’s health.This article explores a new preparation of a liquid adsorbent with waste oil as raw material based on the current recovery methods. The orthogonal experiments studied the influence of amount of alkali added, temperature, time, pH value on the adsorbent effect in order to determine the best preparation. Optimized "purification-hydrolysis-modified" three steps’process produces a liquid absorbent that can have similar absorption effect as commercial grade oleic acid.The article studied the effect of waste oil adsorbent treatment of wastewater containing copper and the adsorption mechanism of the simple copper ions directly adsorbed water through the comparison tests of waste oil sorbents, oleic acid-modified adsorbent and the adsorbent aging oleic combined with infrared characterization methods spectrum, NMR and mass spectrometry analysis. The results showed that:oleic acid produces sodium oleate after being modified by concentrated alkali, which improves the ion exchange capacity as well.-C=C-was partly oxidized to carbonyl groups after aging modification to form ketones and more dimers are formed inter and intra molecularly. In this way, hydrogen bonds are strengthened as to improve the adsorption performance. The main ingredient of the liquid sorbent with waste oil as raw material is close to the oleic acid and they have similar adsorption properties.For the issue of the difficulty and complexity to treat copper ammonia complex wastewater, this article explores a new treatment technology based on adsorption-electrolysis synergistic reaction. Taking the simulate copper ammonia complex wastewater as the research object, the electrolysis time, current density and electrolyte temperature were investigated as the influence factors of the electrolytic method. In addition, based on the results of influence factors, the modified oleic acid adsorbent was coated on the surface of the cathode to study the effect of adsorption-electrolysis synergetic in copper ammonia complex wastewater treatment with the help of the orthogonal method. The results showed that the adsorption-electrolysis method could remove copper ions with a rate of93%under smaller current collaboration and shorter processing time. In copper ammonia wastewater treatment, electrophoresis of electric field to copper ions exacerbates absorption, at the same time, the local concentration of copper ions and the efficiency of electrolysis increased due to adsorbent. The advantage of electrolysis and adsorption was combined by adsorption-electrolysis synergistic reaction, resulted in smaller current density, processing time, and higher removal rate, current efficiency.