HECai-chang.Application of Heterogeneous Catalytic Ozonation Technology in High Salt Wastewater Zero Discharge Project[J].China Water & Wastewater,2023,39(6):55-59.
Application of Heterogeneous Catalytic Ozonation Technology in High Salt Wastewater Zero Discharge Project
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第6期
Page:
55-59
Column:
Date of publication:
2023-03-17
- Abstract:
- Heterogeneous catalytic ozonation process was applied to treat the high concentrated liquid from a 200 m3/h high salt wastewater zero discharge project of a chemical company in Inner Mongolia. The concentrated liquid was stable and contained refractory compounds such as polyalene and dichloroethane. The COD was decreased from about 350 mg/L to less than 175 mg/L with the removal efficiency over 50%. The ratio of ozone dosage to the removed amount of organic matter (O3/C) was 2.5, and the catalytic contact reaction time was 40 min. The quality of concentrated liquid crystallization product (sodium chloride) met the solar industrial salt first level limit specified in national standard Salt Standard (GB/T 5462-2015), and the problem that the process stability was affected by the accumulation of organic pollutants after long-term operation of the zero-emission system was effectively solved. The total investment of heterogeneous catalytic ozonation process equipment was 5.86 million yuan, and the operating cost was 4.19 yuan/m3.
Last Update:
2023-03-17