Conclusion: The key design consideration for this system was not only effluent compliance but safety. Concentrated spent chemistry is actively neutralized using, in most cases, spent chemistry. Adverse reactions are known to occur and must be controlled. Furthermore this system is installed in a location that does see frequent traffic.
The system was designed to maximize the use of spent alkalis to neutralize spent acids. This requires that we constantly monitor the rates of reaction and the temperature of the process. Chemical metering is controlled by many parameters including temperature rise. In the event of an uncontrolled temperature rise a water flush circuit is available to rapidly add cooling water, although, by design, this should never happen.
The system described here is based upon our pHASE pH10 but modified specifically for this application. In addition to the safety features of the process the system is designed to be installed outdoors in a contained area. As such the system is provided with UV protection and freeze protection via heat tracing and insulation.
A remote monitoring system is installed that monitors the entire system from anywhere in the world where an Internet connection is available. All of the programmable parameters, tuning variables, and setpoints are available through the remote monitoring system.
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