TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The pre-processing unit comprises a kitchen waste sorting machine, a waste crusher and a pulping device, which are sequentially connected through a pipeline. The sorting machine is used for sorting the collected kitchen waste. The waste crusher is used for crushing, where the waste is passed into the crusher through a pipeline. The pulping device is used for crushing the waste into mixed slurry, where the waste is passed into the pulping device through a pipeline. The mixed slurry is passed into the arc processing unit through a pipeline. The gaseous material processing unit comprises a gas-liquid separator, a primary gas storage tank, a filter, a secondary storage tank, a drier, a compressor and a gas cylinder, which are sequentially connected through a pipeline. The gas-liquid separator is used for performing gas-liquid separation of the gas material produced by the arc processing unit. The primary gas storage tank is used for storing the gaseous material. The filter is used for filtering the gaseous material stored in the primary gas storage tank, when it reaches a first preset value. The secondary air storage tank is used for storing the filtered gas, which is passed into the secondary air storage tank through a pipeline. The drier is used for drying the secondary gas storage gaseous substance, when it reaches the second preset value. The dried gas is compressed and stored in the gas cylinder. The liquid material processing unit comprises a tank, an anaerobic digestion tank, a dehydrator, a drying machine and a storage silo, which are sequentially connected through a pipeline. The liquid material generated by the arc processing unit is passed into the heat exchange unit through a pipeline for heat exchange. The tank is used for mixing the heat exchanged liquid material, passed through a pipeline. The anaerobic digestion tank is used for performing anaerobic digestion of the mixture. The mixture is passed into a dehydrator and to the drying machine for drying using a heat source to obtain fertilizer granules. The fertilizer granules are stored in the storage silos. The arc processing unit comprises an oil-water separating device, connected to two or more submerged arc flow reactor through a pipeline, provided with a valve. The oil-water separating device is used for separating the mixed slurry into a thick grease component and a liquid material component. The two components from submerged arc flow reactor through an upper feeding port enter respectively into different reactors for performing submerged arc high temperature treatment. The submerged arc flow reactor comprises a pressure-proof heat-resistant liquid container. The container is provided with at least one pair of electrodes, soaked in the inputting liquid mixed slurry. The container is provided with mechanisms for transmitting current to the electrode. The container is provided with mechanisms for maintaining and changing the distance between the electrodes. The container of the submerged arc reactor is provided with internal or external mechanisms for maintaining and changing the distance between the electrodes. The mechanism can be an instant short electrode pair to initiate the electric arc. The mechanism is connected with a motor to maintain and change the distance between the electrode pair. The submerged arc reactor comprises a liquid gauge for monitoring the liquid level within the container. A heat exchange unit is arranged between the submerged arc reactor and a pulping device. The anaerobic digester produces marsh gas, which can be used for generating electricity and urban gas pipeline network. The heat generated by the power generation is passed through a heat exchange device or is utilized for drying and granulating.