Benzoic acid-containing wastewater treatment method

The invention discloses a benzoic acid-containing wastewater treatment method. Benzoic acid-containing wastewater is treated by a regulating pond, a filter, a decompression and reuse acid steaming system and a Fenton and coagulation system through a biochemical oxidation process and an ozone oxidation process, so that high-index pollutants, such as refractory organic compounds, inorganic salt andchroma in the wastewater are removed efficiently; finally, the COD of the treated effluent is less than or equal to 100 mg/L; the chroma of the effluent is less than or equal to 75; the pH range of the effluent is 6 to 9. 本发明公开了一种含有苯甲酸的废水处理方法，通过调节池-过滤器-减压回用蒸酸系统-芬顿与混凝系统-生化氧化工艺-臭氧氧化工艺对苯甲酸废水进行处理，使废水中的难降解有机物、无机盐、色度等高指标的污染物得到高效去除，最终处理后出水COD≤100mg/L，出水色度≤75，出水pH范围在6-9。