At a refinery a major turnaround was planned. Due to the many additional cleaning activities a much higher waste water flow was expected. Instead of disposing of this additional waste water externally the customer preferred to treat it at the on-site wastewater treatment plant (WWTP). After researching the challenge, a significant increase in the capacity of pre-treatment was devised.
United Rentals engineered a solution to add additional settling capacity adjacent to the existing Clarifier, including:
- Additional pump capacity to transfer the incoming waste water.
- A combination of manifolds, control valves and flowmeters to divide the incoming flow evenly over the existing pre-clarifier and the additional capacity.
- A series of Filtration “Open Top” Tanks installed in parallel, equipped with flow breakers, overrun weirs and snorkel pipes to expand the settlement capacity.
Using the United Rentals solution to increase the pre-treatment capacity, all the additional wastewater was treated successfully within the on-site WWTP. Additional costs for temporary containment, transport and external disposal were avoided.
Filtration "Open Top" Tank
SECONDARY CLARIFIER: MIXED CONTAINMENT OF EXCESS BIOMASS
At a wastewater treatment plant, the Clarifier was producing more sludge than could be processed and dewatered on site.