Recovery and Treatment of Garlic Oil from Garlic Slices Processing Wastewater

Abstract

China is a big producer and exporter of dehydrated garlic slices. A large amount of garlic slices processing wastewater was produced every year, which contains garlic oil. In order to recycle and utilize this resource, this paper takes the local garlic slices processing wastewater in Jinxiang County of Shandong Province as the research object, and through "Microfiltration (MF)+Distillation". The method of distillation was used to extract garlic oil from garlic slice processing wastewater, and the effect of garlic slice cleaning process on garlic oil yield in wastewater was investigated. The results showed that the yield of garlic oil could reach 0.45‰ under the optimum cleaning conditions. Introduction Garlic slices is an important export agricultural product in China while a large number of processing wastewater are produced in the cleaning process of garlic slices. The discharge of the processing wastewater not only causes great harm to the environment but also seriously restricts the sustainable development of China's garlic industry [1]. The processing wastewater can also cause serious damage to the creatures and the environment. The main components of the garlic oil that cause environmental pollution are the garlic polysaccharides, the allicin and other organic compounds that are of economic value[2]. It is estimated that 17 to 20 tons of water to process per ton of garlic slices and there are 3.36 million tons of processing wastewater of garlic slices each year with the loss of about 30000 tons of garlic polysaccharide and 120 tons of the allicin [3]. The treatment technology of the processing wastewater of garlic slices is still in the research stage. At present, the treatment technology to processing wastewater of garlic slices is still at the stage of study, and there is less research on extracting garlic oil from processing wastewater of garlic slices. Existing extraction methods include organic solvent extraction[4] and resin adsorption[5]. The method of resin adsorption is a new type method of water treatment. It has innovative significance in the extraction of garlic oil, but due to the complex operation and high production costs, it has not been promoted. This experiment summarized existing experimental data, and comprehensively considered various influencing factors, and selected suitable experimental methods to extract garlic oil from wastewater. The garlic oil has antibacterial anti-inflammatory, improve immunity, anti-cancer and other anti-cancer effect, with high medical and health value[6]. In this paper, the experimental study of extracting garlic oil from garlic waste water can extract valuable resources from waste water, and the cost is low, so it has huge economic and social benefits. Materials and Methods Experimental Principle Garlic oil is a kind of yellow oily liquid with a strong spicy flavor that is insoluble in water and