China's largest oilfield sewage treatment project is currently under construction in Karamay Oilfield. After the project is completed, it will completely solve the oil pollution problem that has plagued Karamay for more than 40 years. This project will create China's three most oilfields. That is, the largest sewage treatment capacity is 35,000 cubic meters per day; the largest single tank capacity is 9000 cubic meters; the largest one-time investment is with a total investment of 110 million yuan.