Reconstruction of the Oxidation Tower in a Large Industrial Park of a State-Owned Enterprise
2026-06-17
Project Overview:
This project involves the upgrade and retrofit of the advanced oxidation process at a wastewater treatment plant within a chemical industrial park. The plant primarily treats effluents from fine‑chemical and pesticide manufacturing, with a designed daily treatment capacity of 20,000 tons. Its core treatment target is the effluent from the biochemical treatment system. The existing conventional ozone‑contact oxidation process suffers from low COD removal efficiency, poor ozone utilization, and fugitive emissions, resulting in insufficient treatment performance and unstable effluent quality that fail to meet operational requirements.
Project Conclusion:
This upgrade introduces an advanced ozone‑ultrafine nanobubble gas‑dissolution process, replacing the conventional aeration‑based ozone oxidation method. Operational data show that this process achieves a COD removal rate of over 60% in the effluent, with ozone utilization significantly higher than that of traditional systems and no observable ozone leakage on site. At the same time, it effectively reduces the required ozone dosage, increases the upper limit of the ozone treatment capacity, and ensures stable effluent quality, demonstrating outstanding performance in the modernization and upgrading of conventional oxidation processes.
This project, with Phase I construction completed by Zhuhong, represents the first large-scale application of ozone micro‑ and nano‑bubble technology in China. By retrofitting conventional ozone oxidation towers, the process achieves a rapid increase in ozone reaction efficiency and a reduction in hydraulic retention time, resulting in a 40%–60% reduction in ozone consumption while significantly enhancing COD removal performance.
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