1. High COD
2. High colour intensity
3. High concentration of polyphenolic compounds
Solution：Conducted on-site tests on carbon saturation, biological treatment, and ozone oxidation to address the decolorization challenge.
Processing Scale：850m³/d
Treatment Effect：The effluent colour intensity was reduced to below 1,000, meeting internal discharge standards.
Characteristics
1. High COD
2. High colour intensity
3. High concentration of polyphenolic compounds
Plant Profile
Description
The refined sugar wastewater treatment system processed approximately 35 m³/h. The influent COD ranged from 1,500 to 1,800 mg/L, and the effluent COD was about 300–400 mg/L.
As planned, non-saline wastewater was to be recycled, and saline wastewater was to be discharged directly to the industrial park’s wastewater treatment plant if it met the required discharge standards.
However, due to the high colour intensity of the effluent, the industrial park might face challenges in accepting it, potentially impacting operations. Therefore, resolving the colour issue was critical.
Option
A combination of carbon saturation technology, biological treatment, and ozone oxidation was applied to decolorize high-salinity wastewater (characterized by elevated chloride levels). This approach successfully reduced the effluent colour intensity to less than 1/100 of the internal discharge standard, while also lowering effluent COD concentrations.
Also, strategic guidance for future engineering investments was provided considering capital investment, treatment costs, maintenance costs, and labour expenses.
Result
The ozone decolorization process was capable of meeting decolorization requirements. When the ozone dosage reached 200 g per ton of wastewater and the reaction time was maintained at 2 to 2.5 hours, the effluent colour was reduced to within the internal control limit of 1,000.
Periodic Service
