Municipal Wastewater Pollution Management

Problem:

Wastewater plant operators are bound by stringent regulations for discharging treated wastewater to the environment. Biochemical Oxygen Demand (BOD) is a primary concern for many discharge limits, as wastewaters high in BOD can have adverse impacts on aquatic environments by leading to oxygen depletion. In some cases, as a means to supplement BOD, it is also desirable to monitor chemical oxygen demand (COD) of the wastewater effluent. Both of these tests are time and labour intensive reducing the frequency at which they can be measured for a given effluent.

Solution:

Online monitoring of municipal wastewater treatment plant effluents by UV/Vis spectral analysis allows for continuous detection of BOD and COD (whether it be the effluent of a process within the plant or the final effluent being discharged into the environment). Online monitoring provides valuable information on the temporal and spatial BOD and COD variations. This enables the plant operators to modify processes and optimize dosing of chemicals ensuring the highest efficiency for the treatment is achieved while minimizing costs. In addition, nitrites and nitrates can also be monitored in real-time to optimize nutrient removal processes and ensure compliance with regulations.

Results:

  • Limit potential for non-compliance events
  • Optimize treatment processes
  • Optimize chemical dosing and aeration rates, and reduce costs

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