TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Method: The separation system is set with a double layer filtering system, an electronic anti-theft system, waste oil metering system, a rotational flow shallow filter and a biological treatment filter core. When the oil condensation temperature is low, starting an electric heating system for heating oil and is equipped with special interfaces. When the filter core requires cleaning, a cleaning alarm will notify management personnel for cleaning. The double layer filtering system achieves total filtration through a filter structure. A first layer is a main filtering layer used for trapping the large granule filer impurities, and a second layer is a secondary filter layer, which is mainly to ensure that the impurities do not enter into the main body device. The electronic theft-proof system is provided with a cover lock as an electronic sensing lock, an external illegal unlocking and a sensor for triggering an alarm system. The shallow filter is a spiral clapboard structure, when the sewage movement is in spiral manner from top to bottom, the oil droplets are trapped in a spiral oil clapboard to achieve oil-water separation. The biological treatment filter core is provided with a large surface area for biological treatment, at the same time, oleophilic material can be attached to small particles of oil droplets. The filter core is capable of microbial degradation of animal and plant oil through microbial activity to degrade animal and vegetable oils. The collecting system of vacuum negative pressure collector adopts collecting ways divided into automatic collecting method, semi-collecting method and manual collecting manner. The automatic collecting method comprises conveniently conveying the vehicle into the area close to the roadside device for directly collecting. The semi-automatic collecting method comprises conveying the other automobile into the place through small way or lame for collecting. The manual collection method comprises using manual collection process when the basement or upstairs, and trolley cannot be entered the place, collecting lightweights using a weight collector, which is convenient to carry.