Director, deputy director, producer, etc. Changsha Chengnan Sewage Treatment Plant is located in Tuling Community, Langli Street, Changsha County. There are factory director, deputy factory director, production, technology and office posts, mainly including production technology, power, equipment personnel, laboratory technicians, equipment maintenance, equipment operators, etc. Some grass-roots employees mainly use the traditional activated sludge method to separate or convert pollutants in sewage into harmless substances, thus purifying sewage.