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Transitioning from two aeration tanks in parallel to an anoxic tank and an aeration tank in series to treat wastewater with high chloride concentrations of about 10,000 ppm may present some risks and challenges. The new configuration may require changes to the plant's operation and maintenance practices, and may result in temporary disruptions to the treatment process.

One of the main risks associated with this transition is the potential for increased energy consumption. The new configuration may require additional energy to maintain the anoxic conditions in the anoxic tank, and to operate the additional pumps and equipment required for the new configuration.

Another risk is the potential for decreased treatment efficiency during the transition period. It may take some time for the plant operators to optimize the new configuration, which could result in temporary disruptions to the treatment process and a decrease in the quality of the effluent.

To maintain the required effluent COD <50 ppm and ammonia nitrogen <5 ppm for the continuous water monitoring system, the new configuration will need to be carefully optimized and monitored. The anoxic and aeration tanks will need to be operated with the appropriate hydraulic retention times and DO levels to ensure efficient removal of COD and ammonia nitrogen.

The transition time from two aeration tanks in parallel to an anoxic tank and an aeration tank in series can vary depending on the complexity of the new configuration and the experience and expertise of the plant operators. In some cases, the transition may be completed relatively quickly, while in other cases it may take several weeks or months to fully optimize the new configuration.

It is recommended to carefully plan and monitor the transition process to minimize disruptions to the treatment process and ensure a smooth transition. Additionally, plant operators should closely monitor the effluent quality during the transition period to ensure that the required COD and ammonia nitrogen levels are being met.