Process Monitoring & Control
Process Monitoring & Control
Automation using water quality instrumentation can save money, optimise a process and give warning of potential breeches of discharge consent. However, instrument selection is fundamentally important, if the installed monitoring & control system is to function efficiently. The measurement device(s) must accurately and quickly respond to process variations and must be reliable in operation. If the measurement system is designed properly, energy and chemical consumption can be significantly reduced and effluent quality improved, at the same time as cutting operational costs. Key parameters include Total Organic Carbon, Ammonia, pH, Conductivity and Suspended Solids.
Common Process Control Measurements
A wide range of process instrumentation, specifically designed for monitoring waste water streams, is now available with the required output control functionality to either regulate the treatment process or to communicate live data, to the site communication system.
Measurements such as pH and Conductivity are extensively employed to monitor acids and bases after CIP (Clean In Place) and for control of pH adjustment dosing systems used to neutralise process effluent.
Progressively, Total Organic Carbon (TOC) is being installed to trend organic loads and predict associated organic chemical demands, to divert high strength effluent, improve treatment and optimise effluent quality.
Turbidity and Suspended Solids measurement are also used to quantify the physical characteristic of a sample, to regulate the MLSS concentration for biological treatment processes and to ensure primary and secondary settlement /filtration processes are functioning as intended.
Dissolved Oxygen is extensively installed to monitor and control aerobic digestion processes whilst, anaerobic digestion process may also benefit from the installation of ORP or dissolved oxygen measurement.
More recently, the integration of ammonium / ammonia measurement technology directly within the nitrification process has optimised the nitrification treatment process to allow the removal of ammoniacal nitrogen to a defined concentration. This enhanced control functionality has the benefit of reducing energy consumption with significant cost saving potential.
Alarm signals from these instruments can be connected to control systems to proportional dose chemicals, adjust aeration or even operate actuated valves, to contain process effluent or contaminated surface water. Diversion and containment of high strength effluent streams for treatment off site can protect biological treatment systems from peak loads. Similarly, contaminated surface water can also be diverted and contained in order to protect the local environment from pollution leaving site.
Key Water Quality Parameters
- Total Organic Carbon
- (TOC)OilFilm Detection
- Ammonia
- Turbidity & Suspended Solids (MLSS)
- Dissolved Oxygen (DO)
- pH & Temperature
- Conductivity
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