This subject was about study of pilot test and industrial practice, for applyingthe hydrolysis(acidification)+A/O new process combination to treat chemicalwastewater of Lanzhou petro-chemical company. With the cooperation betweenBeijing Huanlike company and Lanzhou petro-chemical company, we used thehydrolysis(acidification)+A/O process and conducted some industrial tests inwastewater treatment plant of Lanzhou petro-chemical company ,based on these tests,we had reformed and begun to run 5.5×104t/d industri...