2. Shanghai Bentley Waste Oil Recovery and Treatment Center is a professional waste oil recovery and treatment center under Shanghai Sanyi Industrial Company. Since 2002, the center has been specialized in the recovery and treatment of waste oil, making nearly one million tons of waste oil not pour into sewers, but into rivers, giving full play to its due energy. Now the center has become one of the largest waste oil recycling companies in Shanghai and even the Yangtze River Delta.