Tecumseth Optimal
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Solids Based Pumping

The settled solids in each hopper of Primary Clarifiers are typically pumped to subsequent operations on a time or duration basis that is programmed into the monitoring SCADA system. This frequently results in very low density sludge being moved through the operation, and that reduces overall capacity and efficiency of the entire treatment process. With the addition of total solids measurement and the integration of Solids Based Pumping control into the SCADA system, Tecumseth allows operators to choose between Time Based Pumping or Solids Based Pumping to achieve the best performance and throughput possible.

Solids Based Pumping uses the measured total solids value of the sludge to determine the length of pumping time for each hopper. A lower solids limit is set and pumping is instructed to stop when the sludge reaches that degree of dilution. The system will then either instruct the operation to begin pumping from the next hopper immediately or to do so at the next time interval. The benefits of this approach are evident in the more stable and higher solids loading of the remaining operations through the digesters, thickener and compaction to cake.

Wasting Rate Control

Wasting Rate Control for secondary treatment clarifiers uses the total solids measurement together with flow and volume to calculate the retention time of solids. When the retention time is determined, a pumping flow rate can be set to optimize the secondary clarifier operation. This capability maximizes the capacity of the secondary treatment operation and ensures effective treatment is being achieved.

Gas Collection Optimization

Digester Gas Collection Optimization occurs after Solids Based Pumping has been implemented at the primary clarifiers. As the sludge solids feed to the digester reaches higher levels and is held there, increased amounts of gas are generated.